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1/*
2 * Copyright (C) 2014 Red Hat
3 * Copyright (C) 2014 Intel Corp.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Rob Clark <robdclark@gmail.com>
25 * Daniel Vetter <daniel.vetter@ffwll.ch>
26 */
27
28#include <linux/dma-fence.h>
29#include <linux/ktime.h>
30
31#include <drm/drm_atomic.h>
32#include <drm/drm_atomic_helper.h>
33#include <drm/drm_atomic_uapi.h>
34#include <drm/drm_blend.h>
35#include <drm/drm_bridge.h>
36#include <drm/drm_damage_helper.h>
37#include <drm/drm_device.h>
38#include <drm/drm_drv.h>
39#include <drm/drm_framebuffer.h>
40#include <drm/drm_gem_atomic_helper.h>
41#include <drm/drm_panic.h>
42#include <drm/drm_print.h>
43#include <drm/drm_self_refresh_helper.h>
44#include <drm/drm_vblank.h>
45#include <drm/drm_writeback.h>
46
47#include "drm_crtc_helper_internal.h"
48#include "drm_crtc_internal.h"
49
50/**
51 * DOC: overview
52 *
53 * This helper library provides implementations of check and commit functions on
54 * top of the CRTC modeset helper callbacks and the plane helper callbacks. It
55 * also provides convenience implementations for the atomic state handling
56 * callbacks for drivers which don't need to subclass the drm core structures to
57 * add their own additional internal state.
58 *
59 * This library also provides default implementations for the check callback in
60 * drm_atomic_helper_check() and for the commit callback with
61 * drm_atomic_helper_commit(). But the individual stages and callbacks are
62 * exposed to allow drivers to mix and match and e.g. use the plane helpers only
63 * together with a driver private modeset implementation.
64 *
65 * This library also provides implementations for all the legacy driver
66 * interfaces on top of the atomic interface. See drm_atomic_helper_set_config(),
67 * drm_atomic_helper_disable_plane(), and the various functions to implement
68 * set_property callbacks. New drivers must not implement these functions
69 * themselves but must use the provided helpers.
70 *
71 * The atomic helper uses the same function table structures as all other
72 * modesetting helpers. See the documentation for &struct drm_crtc_helper_funcs,
73 * struct &drm_encoder_helper_funcs and &struct drm_connector_helper_funcs. It
74 * also shares the &struct drm_plane_helper_funcs function table with the plane
75 * helpers.
76 */
77static void
78drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
79 struct drm_plane_state *old_plane_state,
80 struct drm_plane_state *plane_state,
81 struct drm_plane *plane)
82{
83 struct drm_crtc_state *crtc_state;
84
85 if (old_plane_state->crtc) {
86 crtc_state = drm_atomic_get_new_crtc_state(state,
87 old_plane_state->crtc);
88
89 if (WARN_ON(!crtc_state))
90 return;
91
92 crtc_state->planes_changed = true;
93 }
94
95 if (plane_state->crtc) {
96 crtc_state = drm_atomic_get_new_crtc_state(state, plane_state->crtc);
97
98 if (WARN_ON(!crtc_state))
99 return;
100
101 crtc_state->planes_changed = true;
102 }
103}
104
105static int handle_conflicting_encoders(struct drm_atomic_state *state,
106 bool disable_conflicting_encoders)
107{
108 struct drm_connector_state *new_conn_state;
109 struct drm_connector *connector;
110 struct drm_connector_list_iter conn_iter;
111 struct drm_encoder *encoder;
112 unsigned int encoder_mask = 0;
113 int i, ret = 0;
114
115 /*
116 * First loop, find all newly assigned encoders from the connectors
117 * part of the state. If the same encoder is assigned to multiple
118 * connectors bail out.
119 */
120 for_each_new_connector_in_state(state, connector, new_conn_state, i) {
121 const struct drm_connector_helper_funcs *funcs = connector->helper_private;
122 struct drm_encoder *new_encoder;
123
124 if (!new_conn_state->crtc)
125 continue;
126
127 if (funcs->atomic_best_encoder)
128 new_encoder = funcs->atomic_best_encoder(connector,
129 state);
130 else if (funcs->best_encoder)
131 new_encoder = funcs->best_encoder(connector);
132 else
133 new_encoder = drm_connector_get_single_encoder(connector);
134
135 if (new_encoder) {
136 if (encoder_mask & drm_encoder_mask(new_encoder)) {
137 drm_dbg_atomic(connector->dev,
138 "[ENCODER:%d:%s] on [CONNECTOR:%d:%s] already assigned\n",
139 new_encoder->base.id, new_encoder->name,
140 connector->base.id, connector->name);
141
142 return -EINVAL;
143 }
144
145 encoder_mask |= drm_encoder_mask(new_encoder);
146 }
147 }
148
149 if (!encoder_mask)
150 return 0;
151
152 /*
153 * Second loop, iterate over all connectors not part of the state.
154 *
155 * If a conflicting encoder is found and disable_conflicting_encoders
156 * is not set, an error is returned. Userspace can provide a solution
157 * through the atomic ioctl.
158 *
159 * If the flag is set conflicting connectors are removed from the CRTC
160 * and the CRTC is disabled if no encoder is left. This preserves
161 * compatibility with the legacy set_config behavior.
162 */
163 drm_connector_list_iter_begin(state->dev, &conn_iter);
164 drm_for_each_connector_iter(connector, &conn_iter) {
165 struct drm_crtc_state *crtc_state;
166
167 if (drm_atomic_get_new_connector_state(state, connector))
168 continue;
169
170 encoder = connector->state->best_encoder;
171 if (!encoder || !(encoder_mask & drm_encoder_mask(encoder)))
172 continue;
173
174 if (!disable_conflicting_encoders) {
175 drm_dbg_atomic(connector->dev,
176 "[ENCODER:%d:%s] in use on [CRTC:%d:%s] by [CONNECTOR:%d:%s]\n",
177 encoder->base.id, encoder->name,
178 connector->state->crtc->base.id,
179 connector->state->crtc->name,
180 connector->base.id, connector->name);
181 ret = -EINVAL;
182 goto out;
183 }
184
185 new_conn_state = drm_atomic_get_connector_state(state, connector);
186 if (IS_ERR(new_conn_state)) {
187 ret = PTR_ERR(new_conn_state);
188 goto out;
189 }
190
191 drm_dbg_atomic(connector->dev,
192 "[ENCODER:%d:%s] in use on [CRTC:%d:%s], disabling [CONNECTOR:%d:%s]\n",
193 encoder->base.id, encoder->name,
194 new_conn_state->crtc->base.id, new_conn_state->crtc->name,
195 connector->base.id, connector->name);
196
197 crtc_state = drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);
198
199 ret = drm_atomic_set_crtc_for_connector(new_conn_state, NULL);
200 if (ret)
201 goto out;
202
203 if (!crtc_state->connector_mask) {
204 ret = drm_atomic_set_mode_prop_for_crtc(crtc_state,
205 NULL);
206 if (ret < 0)
207 goto out;
208
209 crtc_state->active = false;
210 }
211 }
212out:
213 drm_connector_list_iter_end(&conn_iter);
214
215 return ret;
216}
217
218static void
219set_best_encoder(struct drm_atomic_state *state,
220 struct drm_connector_state *conn_state,
221 struct drm_encoder *encoder)
222{
223 struct drm_crtc_state *crtc_state;
224 struct drm_crtc *crtc;
225
226 if (conn_state->best_encoder) {
227 /* Unset the encoder_mask in the old crtc state. */
228 crtc = conn_state->connector->state->crtc;
229
230 /* A NULL crtc is an error here because we should have
231 * duplicated a NULL best_encoder when crtc was NULL.
232 * As an exception restoring duplicated atomic state
233 * during resume is allowed, so don't warn when
234 * best_encoder is equal to encoder we intend to set.
235 */
236 WARN_ON(!crtc && encoder != conn_state->best_encoder);
237 if (crtc) {
238 crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
239
240 crtc_state->encoder_mask &=
241 ~drm_encoder_mask(conn_state->best_encoder);
242 }
243 }
244
245 if (encoder) {
246 crtc = conn_state->crtc;
247 WARN_ON(!crtc);
248 if (crtc) {
249 crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
250
251 crtc_state->encoder_mask |=
252 drm_encoder_mask(encoder);
253 }
254 }
255
256 conn_state->best_encoder = encoder;
257}
258
259static void
260steal_encoder(struct drm_atomic_state *state,
261 struct drm_encoder *encoder)
262{
263 struct drm_crtc_state *crtc_state;
264 struct drm_connector *connector;
265 struct drm_connector_state *old_connector_state, *new_connector_state;
266 int i;
267
268 for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
269 struct drm_crtc *encoder_crtc;
270
271 if (new_connector_state->best_encoder != encoder)
272 continue;
273
274 encoder_crtc = old_connector_state->crtc;
275
276 drm_dbg_atomic(encoder->dev,
277 "[ENCODER:%d:%s] in use on [CRTC:%d:%s], stealing it\n",
278 encoder->base.id, encoder->name,
279 encoder_crtc->base.id, encoder_crtc->name);
280
281 set_best_encoder(state, new_connector_state, NULL);
282
283 crtc_state = drm_atomic_get_new_crtc_state(state, encoder_crtc);
284 crtc_state->connectors_changed = true;
285
286 return;
287 }
288}
289
290static int
291update_connector_routing(struct drm_atomic_state *state,
292 struct drm_connector *connector,
293 struct drm_connector_state *old_connector_state,
294 struct drm_connector_state *new_connector_state,
295 bool added_by_user)
296{
297 const struct drm_connector_helper_funcs *funcs;
298 struct drm_encoder *new_encoder;
299 struct drm_crtc_state *crtc_state;
300
301 drm_dbg_atomic(connector->dev, "Updating routing for [CONNECTOR:%d:%s]\n",
302 connector->base.id, connector->name);
303
304 if (old_connector_state->crtc != new_connector_state->crtc) {
305 if (old_connector_state->crtc) {
306 crtc_state = drm_atomic_get_new_crtc_state(state, old_connector_state->crtc);
307 crtc_state->connectors_changed = true;
308 }
309
310 if (new_connector_state->crtc) {
311 crtc_state = drm_atomic_get_new_crtc_state(state, new_connector_state->crtc);
312 crtc_state->connectors_changed = true;
313 }
314 }
315
316 if (!new_connector_state->crtc) {
317 drm_dbg_atomic(connector->dev, "Disabling [CONNECTOR:%d:%s]\n",
318 connector->base.id, connector->name);
319
320 set_best_encoder(state, new_connector_state, NULL);
321
322 return 0;
323 }
324
325 crtc_state = drm_atomic_get_new_crtc_state(state,
326 new_connector_state->crtc);
327 /*
328 * For compatibility with legacy users, we want to make sure that
329 * we allow DPMS On->Off modesets on unregistered connectors. Modesets
330 * which would result in anything else must be considered invalid, to
331 * avoid turning on new displays on dead connectors.
332 *
333 * Since the connector can be unregistered at any point during an
334 * atomic check or commit, this is racy. But that's OK: all we care
335 * about is ensuring that userspace can't do anything but shut off the
336 * display on a connector that was destroyed after it's been notified,
337 * not before.
338 *
339 * Additionally, we also want to ignore connector registration when
340 * we're trying to restore an atomic state during system resume since
341 * there's a chance the connector may have been destroyed during the
342 * process, but it's better to ignore that then cause
343 * drm_atomic_helper_resume() to fail.
344 *
345 * Last, we want to ignore connector registration when the connector
346 * was not pulled in the atomic state by user-space (ie, was pulled
347 * in by the driver, e.g. when updating a DP-MST stream).
348 */
349 if (!state->duplicated && drm_connector_is_unregistered(connector) &&
350 added_by_user && crtc_state->active) {
351 drm_dbg_atomic(connector->dev,
352 "[CONNECTOR:%d:%s] is not registered\n",
353 connector->base.id, connector->name);
354 return -EINVAL;
355 }
356
357 funcs = connector->helper_private;
358
359 if (funcs->atomic_best_encoder)
360 new_encoder = funcs->atomic_best_encoder(connector, state);
361 else if (funcs->best_encoder)
362 new_encoder = funcs->best_encoder(connector);
363 else
364 new_encoder = drm_connector_get_single_encoder(connector);
365
366 if (!new_encoder) {
367 drm_dbg_atomic(connector->dev,
368 "No suitable encoder found for [CONNECTOR:%d:%s]\n",
369 connector->base.id, connector->name);
370 return -EINVAL;
371 }
372
373 if (!drm_encoder_crtc_ok(new_encoder, new_connector_state->crtc)) {
374 drm_dbg_atomic(connector->dev,
375 "[ENCODER:%d:%s] incompatible with [CRTC:%d:%s]\n",
376 new_encoder->base.id,
377 new_encoder->name,
378 new_connector_state->crtc->base.id,
379 new_connector_state->crtc->name);
380 return -EINVAL;
381 }
382
383 if (new_encoder == new_connector_state->best_encoder) {
384 set_best_encoder(state, new_connector_state, new_encoder);
385
386 drm_dbg_atomic(connector->dev,
387 "[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d:%s]\n",
388 connector->base.id,
389 connector->name,
390 new_encoder->base.id,
391 new_encoder->name,
392 new_connector_state->crtc->base.id,
393 new_connector_state->crtc->name);
394
395 return 0;
396 }
397
398 steal_encoder(state, new_encoder);
399
400 set_best_encoder(state, new_connector_state, new_encoder);
401
402 crtc_state->connectors_changed = true;
403
404 drm_dbg_atomic(connector->dev,
405 "[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d:%s]\n",
406 connector->base.id,
407 connector->name,
408 new_encoder->base.id,
409 new_encoder->name,
410 new_connector_state->crtc->base.id,
411 new_connector_state->crtc->name);
412
413 return 0;
414}
415
416static int
417mode_fixup(struct drm_atomic_state *state)
418{
419 struct drm_crtc *crtc;
420 struct drm_crtc_state *new_crtc_state;
421 struct drm_connector *connector;
422 struct drm_connector_state *new_conn_state;
423 int i;
424 int ret;
425
426 for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
427 if (!new_crtc_state->mode_changed &&
428 !new_crtc_state->connectors_changed)
429 continue;
430
431 drm_mode_copy(&new_crtc_state->adjusted_mode, &new_crtc_state->mode);
432 }
433
434 for_each_new_connector_in_state(state, connector, new_conn_state, i) {
435 const struct drm_encoder_helper_funcs *funcs;
436 struct drm_encoder *encoder;
437 struct drm_bridge *bridge;
438
439 WARN_ON(!!new_conn_state->best_encoder != !!new_conn_state->crtc);
440
441 if (!new_conn_state->crtc || !new_conn_state->best_encoder)
442 continue;
443
444 new_crtc_state =
445 drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);
446
447 /*
448 * Each encoder has at most one connector (since we always steal
449 * it away), so we won't call ->mode_fixup twice.
450 */
451 encoder = new_conn_state->best_encoder;
452 funcs = encoder->helper_private;
453
454 bridge = drm_bridge_chain_get_first_bridge(encoder);
455 ret = drm_atomic_bridge_chain_check(bridge,
456 new_crtc_state,
457 new_conn_state);
458 if (ret) {
459 drm_dbg_atomic(encoder->dev, "Bridge atomic check failed\n");
460 return ret;
461 }
462
463 if (funcs && funcs->atomic_check) {
464 ret = funcs->atomic_check(encoder, new_crtc_state,
465 new_conn_state);
466 if (ret) {
467 drm_dbg_atomic(encoder->dev,
468 "[ENCODER:%d:%s] check failed\n",
469 encoder->base.id, encoder->name);
470 return ret;
471 }
472 } else if (funcs && funcs->mode_fixup) {
473 ret = funcs->mode_fixup(encoder, &new_crtc_state->mode,
474 &new_crtc_state->adjusted_mode);
475 if (!ret) {
476 drm_dbg_atomic(encoder->dev,
477 "[ENCODER:%d:%s] fixup failed\n",
478 encoder->base.id, encoder->name);
479 return -EINVAL;
480 }
481 }
482 }
483
484 for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
485 const struct drm_crtc_helper_funcs *funcs;
486
487 if (!new_crtc_state->enable)
488 continue;
489
490 if (!new_crtc_state->mode_changed &&
491 !new_crtc_state->connectors_changed)
492 continue;
493
494 funcs = crtc->helper_private;
495 if (!funcs || !funcs->mode_fixup)
496 continue;
497
498 ret = funcs->mode_fixup(crtc, &new_crtc_state->mode,
499 &new_crtc_state->adjusted_mode);
500 if (!ret) {
501 drm_dbg_atomic(crtc->dev, "[CRTC:%d:%s] fixup failed\n",
502 crtc->base.id, crtc->name);
503 return -EINVAL;
504 }
505 }
506
507 return 0;
508}
509
510static enum drm_mode_status mode_valid_path(struct drm_connector *connector,
511 struct drm_encoder *encoder,
512 struct drm_crtc *crtc,
513 const struct drm_display_mode *mode)
514{
515 struct drm_bridge *bridge;
516 enum drm_mode_status ret;
517
518 ret = drm_encoder_mode_valid(encoder, mode);
519 if (ret != MODE_OK) {
520 drm_dbg_atomic(encoder->dev,
521 "[ENCODER:%d:%s] mode_valid() failed\n",
522 encoder->base.id, encoder->name);
523 return ret;
524 }
525
526 bridge = drm_bridge_chain_get_first_bridge(encoder);
527 ret = drm_bridge_chain_mode_valid(bridge, &connector->display_info,
528 mode);
529 if (ret != MODE_OK) {
530 drm_dbg_atomic(encoder->dev, "[BRIDGE] mode_valid() failed\n");
531 return ret;
532 }
533
534 ret = drm_crtc_mode_valid(crtc, mode);
535 if (ret != MODE_OK) {
536 drm_dbg_atomic(encoder->dev, "[CRTC:%d:%s] mode_valid() failed\n",
537 crtc->base.id, crtc->name);
538 return ret;
539 }
540
541 return ret;
542}
543
544static int
545mode_valid(struct drm_atomic_state *state)
546{
547 struct drm_connector_state *conn_state;
548 struct drm_connector *connector;
549 int i;
550
551 for_each_new_connector_in_state(state, connector, conn_state, i) {
552 struct drm_encoder *encoder = conn_state->best_encoder;
553 struct drm_crtc *crtc = conn_state->crtc;
554 struct drm_crtc_state *crtc_state;
555 enum drm_mode_status mode_status;
556 const struct drm_display_mode *mode;
557
558 if (!crtc || !encoder)
559 continue;
560
561 crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
562 if (!crtc_state)
563 continue;
564 if (!crtc_state->mode_changed && !crtc_state->connectors_changed)
565 continue;
566
567 mode = &crtc_state->mode;
568
569 mode_status = mode_valid_path(connector, encoder, crtc, mode);
570 if (mode_status != MODE_OK)
571 return -EINVAL;
572 }
573
574 return 0;
575}
576
577/**
578 * drm_atomic_helper_check_modeset - validate state object for modeset changes
579 * @dev: DRM device
580 * @state: the driver state object
581 *
582 * Check the state object to see if the requested state is physically possible.
583 * This does all the CRTC and connector related computations for an atomic
584 * update and adds any additional connectors needed for full modesets. It calls
585 * the various per-object callbacks in the follow order:
586 *
587 * 1. &drm_connector_helper_funcs.atomic_best_encoder for determining the new encoder.
588 * 2. &drm_connector_helper_funcs.atomic_check to validate the connector state.
589 * 3. If it's determined a modeset is needed then all connectors on the affected
590 * CRTC are added and &drm_connector_helper_funcs.atomic_check is run on them.
591 * 4. &drm_encoder_helper_funcs.mode_valid, &drm_bridge_funcs.mode_valid and
592 * &drm_crtc_helper_funcs.mode_valid are called on the affected components.
593 * 5. &drm_bridge_funcs.mode_fixup is called on all encoder bridges.
594 * 6. &drm_encoder_helper_funcs.atomic_check is called to validate any encoder state.
595 * This function is only called when the encoder will be part of a configured CRTC,
596 * it must not be used for implementing connector property validation.
597 * If this function is NULL, &drm_atomic_encoder_helper_funcs.mode_fixup is called
598 * instead.
599 * 7. &drm_crtc_helper_funcs.mode_fixup is called last, to fix up the mode with CRTC constraints.
600 *
601 * &drm_crtc_state.mode_changed is set when the input mode is changed.
602 * &drm_crtc_state.connectors_changed is set when a connector is added or
603 * removed from the CRTC. &drm_crtc_state.active_changed is set when
604 * &drm_crtc_state.active changes, which is used for DPMS.
605 * &drm_crtc_state.no_vblank is set from the result of drm_dev_has_vblank().
606 * See also: drm_atomic_crtc_needs_modeset()
607 *
608 * IMPORTANT:
609 *
610 * Drivers which set &drm_crtc_state.mode_changed (e.g. in their
611 * &drm_plane_helper_funcs.atomic_check hooks if a plane update can't be done
612 * without a full modeset) _must_ call this function after that change. It is
613 * permitted to call this function multiple times for the same update, e.g.
614 * when the &drm_crtc_helper_funcs.atomic_check functions depend upon the
615 * adjusted dotclock for fifo space allocation and watermark computation.
616 *
617 * RETURNS:
618 * Zero for success or -errno
619 */
620int
621drm_atomic_helper_check_modeset(struct drm_device *dev,
622 struct drm_atomic_state *state)
623{
624 struct drm_crtc *crtc;
625 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
626 struct drm_connector *connector;
627 struct drm_connector_state *old_connector_state, *new_connector_state;
628 int i, ret;
629 unsigned int connectors_mask = 0, user_connectors_mask = 0;
630
631 for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i)
632 user_connectors_mask |= BIT(i);
633
634 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
635 bool has_connectors =
636 !!new_crtc_state->connector_mask;
637
638 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
639
640 if (!drm_mode_equal(&old_crtc_state->mode, &new_crtc_state->mode)) {
641 drm_dbg_atomic(dev, "[CRTC:%d:%s] mode changed\n",
642 crtc->base.id, crtc->name);
643 new_crtc_state->mode_changed = true;
644 }
645
646 if (old_crtc_state->enable != new_crtc_state->enable) {
647 drm_dbg_atomic(dev, "[CRTC:%d:%s] enable changed\n",
648 crtc->base.id, crtc->name);
649
650 /*
651 * For clarity this assignment is done here, but
652 * enable == 0 is only true when there are no
653 * connectors and a NULL mode.
654 *
655 * The other way around is true as well. enable != 0
656 * implies that connectors are attached and a mode is set.
657 */
658 new_crtc_state->mode_changed = true;
659 new_crtc_state->connectors_changed = true;
660 }
661
662 if (old_crtc_state->active != new_crtc_state->active) {
663 drm_dbg_atomic(dev, "[CRTC:%d:%s] active changed\n",
664 crtc->base.id, crtc->name);
665 new_crtc_state->active_changed = true;
666 }
667
668 if (new_crtc_state->enable != has_connectors) {
669 drm_dbg_atomic(dev, "[CRTC:%d:%s] enabled/connectors mismatch\n",
670 crtc->base.id, crtc->name);
671
672 return -EINVAL;
673 }
674
675 if (drm_dev_has_vblank(dev))
676 new_crtc_state->no_vblank = false;
677 else
678 new_crtc_state->no_vblank = true;
679 }
680
681 ret = handle_conflicting_encoders(state, false);
682 if (ret)
683 return ret;
684
685 for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
686 const struct drm_connector_helper_funcs *funcs = connector->helper_private;
687
688 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
689
690 /*
691 * This only sets crtc->connectors_changed for routing changes,
692 * drivers must set crtc->connectors_changed themselves when
693 * connector properties need to be updated.
694 */
695 ret = update_connector_routing(state, connector,
696 old_connector_state,
697 new_connector_state,
698 BIT(i) & user_connectors_mask);
699 if (ret)
700 return ret;
701 if (old_connector_state->crtc) {
702 new_crtc_state = drm_atomic_get_new_crtc_state(state,
703 old_connector_state->crtc);
704 if (old_connector_state->link_status !=
705 new_connector_state->link_status)
706 new_crtc_state->connectors_changed = true;
707
708 if (old_connector_state->max_requested_bpc !=
709 new_connector_state->max_requested_bpc)
710 new_crtc_state->connectors_changed = true;
711 }
712
713 if (funcs->atomic_check)
714 ret = funcs->atomic_check(connector, state);
715 if (ret) {
716 drm_dbg_atomic(dev,
717 "[CONNECTOR:%d:%s] driver check failed\n",
718 connector->base.id, connector->name);
719 return ret;
720 }
721
722 connectors_mask |= BIT(i);
723 }
724
725 /*
726 * After all the routing has been prepared we need to add in any
727 * connector which is itself unchanged, but whose CRTC changes its
728 * configuration. This must be done before calling mode_fixup in case a
729 * crtc only changed its mode but has the same set of connectors.
730 */
731 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
732 if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
733 continue;
734
735 drm_dbg_atomic(dev,
736 "[CRTC:%d:%s] needs all connectors, enable: %c, active: %c\n",
737 crtc->base.id, crtc->name,
738 new_crtc_state->enable ? 'y' : 'n',
739 new_crtc_state->active ? 'y' : 'n');
740
741 ret = drm_atomic_add_affected_connectors(state, crtc);
742 if (ret != 0)
743 return ret;
744
745 ret = drm_atomic_add_affected_planes(state, crtc);
746 if (ret != 0)
747 return ret;
748 }
749
750 /*
751 * Iterate over all connectors again, to make sure atomic_check()
752 * has been called on them when a modeset is forced.
753 */
754 for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
755 const struct drm_connector_helper_funcs *funcs = connector->helper_private;
756
757 if (connectors_mask & BIT(i))
758 continue;
759
760 if (funcs->atomic_check)
761 ret = funcs->atomic_check(connector, state);
762 if (ret) {
763 drm_dbg_atomic(dev,
764 "[CONNECTOR:%d:%s] driver check failed\n",
765 connector->base.id, connector->name);
766 return ret;
767 }
768 }
769
770 /*
771 * Iterate over all connectors again, and add all affected bridges to
772 * the state.
773 */
774 for_each_oldnew_connector_in_state(state, connector,
775 old_connector_state,
776 new_connector_state, i) {
777 struct drm_encoder *encoder;
778
779 encoder = old_connector_state->best_encoder;
780 ret = drm_atomic_add_encoder_bridges(state, encoder);
781 if (ret)
782 return ret;
783
784 encoder = new_connector_state->best_encoder;
785 ret = drm_atomic_add_encoder_bridges(state, encoder);
786 if (ret)
787 return ret;
788 }
789
790 ret = mode_valid(state);
791 if (ret)
792 return ret;
793
794 return mode_fixup(state);
795}
796EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
797
798/**
799 * drm_atomic_helper_check_wb_connector_state() - Check writeback connector state
800 * @connector: corresponding connector
801 * @state: the driver state object
802 *
803 * Checks if the writeback connector state is valid, and returns an error if it
804 * isn't.
805 *
806 * RETURNS:
807 * Zero for success or -errno
808 */
809int
810drm_atomic_helper_check_wb_connector_state(struct drm_connector *connector,
811 struct drm_atomic_state *state)
812{
813 struct drm_connector_state *conn_state =
814 drm_atomic_get_new_connector_state(state, connector);
815 struct drm_writeback_job *wb_job = conn_state->writeback_job;
816 struct drm_property_blob *pixel_format_blob;
817 struct drm_framebuffer *fb;
818 size_t i, nformats;
819 u32 *formats;
820
821 if (!wb_job || !wb_job->fb)
822 return 0;
823
824 pixel_format_blob = wb_job->connector->pixel_formats_blob_ptr;
825 nformats = pixel_format_blob->length / sizeof(u32);
826 formats = pixel_format_blob->data;
827 fb = wb_job->fb;
828
829 for (i = 0; i < nformats; i++)
830 if (fb->format->format == formats[i])
831 return 0;
832
833 drm_dbg_kms(connector->dev, "Invalid pixel format %p4cc\n", &fb->format->format);
834
835 return -EINVAL;
836}
837EXPORT_SYMBOL(drm_atomic_helper_check_wb_connector_state);
838
839/**
840 * drm_atomic_helper_check_plane_state() - Check plane state for validity
841 * @plane_state: plane state to check
842 * @crtc_state: CRTC state to check
843 * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
844 * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
845 * @can_position: is it legal to position the plane such that it
846 * doesn't cover the entire CRTC? This will generally
847 * only be false for primary planes.
848 * @can_update_disabled: can the plane be updated while the CRTC
849 * is disabled?
850 *
851 * Checks that a desired plane update is valid, and updates various
852 * bits of derived state (clipped coordinates etc.). Drivers that provide
853 * their own plane handling rather than helper-provided implementations may
854 * still wish to call this function to avoid duplication of error checking
855 * code.
856 *
857 * RETURNS:
858 * Zero if update appears valid, error code on failure
859 */
860int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
861 const struct drm_crtc_state *crtc_state,
862 int min_scale,
863 int max_scale,
864 bool can_position,
865 bool can_update_disabled)
866{
867 struct drm_framebuffer *fb = plane_state->fb;
868 struct drm_rect *src = &plane_state->src;
869 struct drm_rect *dst = &plane_state->dst;
870 unsigned int rotation = plane_state->rotation;
871 struct drm_rect clip = {};
872 int hscale, vscale;
873
874 WARN_ON(plane_state->crtc && plane_state->crtc != crtc_state->crtc);
875
876 *src = drm_plane_state_src(plane_state);
877 *dst = drm_plane_state_dest(plane_state);
878
879 if (!fb) {
880 plane_state->visible = false;
881 return 0;
882 }
883
884 /* crtc should only be NULL when disabling (i.e., !fb) */
885 if (WARN_ON(!plane_state->crtc)) {
886 plane_state->visible = false;
887 return 0;
888 }
889
890 if (!crtc_state->enable && !can_update_disabled) {
891 drm_dbg_kms(plane_state->plane->dev,
892 "Cannot update plane of a disabled CRTC.\n");
893 return -EINVAL;
894 }
895
896 drm_rect_rotate(src, fb->width << 16, fb->height << 16, rotation);
897
898 /* Check scaling */
899 hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
900 vscale = drm_rect_calc_vscale(src, dst, min_scale, max_scale);
901 if (hscale < 0 || vscale < 0) {
902 drm_dbg_kms(plane_state->plane->dev,
903 "Invalid scaling of plane\n");
904 drm_rect_debug_print("src: ", &plane_state->src, true);
905 drm_rect_debug_print("dst: ", &plane_state->dst, false);
906 return -ERANGE;
907 }
908
909 if (crtc_state->enable)
910 drm_mode_get_hv_timing(&crtc_state->mode, &clip.x2, &clip.y2);
911
912 plane_state->visible = drm_rect_clip_scaled(src, dst, &clip);
913
914 drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16, rotation);
915
916 if (!plane_state->visible)
917 /*
918 * Plane isn't visible; some drivers can handle this
919 * so we just return success here. Drivers that can't
920 * (including those that use the primary plane helper's
921 * update function) will return an error from their
922 * update_plane handler.
923 */
924 return 0;
925
926 if (!can_position && !drm_rect_equals(dst, &clip)) {
927 drm_dbg_kms(plane_state->plane->dev,
928 "Plane must cover entire CRTC\n");
929 drm_rect_debug_print("dst: ", dst, false);
930 drm_rect_debug_print("clip: ", &clip, false);
931 return -EINVAL;
932 }
933
934 return 0;
935}
936EXPORT_SYMBOL(drm_atomic_helper_check_plane_state);
937
938/**
939 * drm_atomic_helper_check_crtc_primary_plane() - Check CRTC state for primary plane
940 * @crtc_state: CRTC state to check
941 *
942 * Checks that a CRTC has at least one primary plane attached to it, which is
943 * a requirement on some hardware. Note that this only involves the CRTC side
944 * of the test. To test if the primary plane is visible or if it can be updated
945 * without the CRTC being enabled, use drm_atomic_helper_check_plane_state() in
946 * the plane's atomic check.
947 *
948 * RETURNS:
949 * 0 if a primary plane is attached to the CRTC, or an error code otherwise
950 */
951int drm_atomic_helper_check_crtc_primary_plane(struct drm_crtc_state *crtc_state)
952{
953 struct drm_crtc *crtc = crtc_state->crtc;
954 struct drm_device *dev = crtc->dev;
955 struct drm_plane *plane;
956
957 /* needs at least one primary plane to be enabled */
958 drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) {
959 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
960 return 0;
961 }
962
963 drm_dbg_atomic(dev, "[CRTC:%d:%s] primary plane missing\n", crtc->base.id, crtc->name);
964
965 return -EINVAL;
966}
967EXPORT_SYMBOL(drm_atomic_helper_check_crtc_primary_plane);
968
969/**
970 * drm_atomic_helper_check_planes - validate state object for planes changes
971 * @dev: DRM device
972 * @state: the driver state object
973 *
974 * Check the state object to see if the requested state is physically possible.
975 * This does all the plane update related checks using by calling into the
976 * &drm_crtc_helper_funcs.atomic_check and &drm_plane_helper_funcs.atomic_check
977 * hooks provided by the driver.
978 *
979 * It also sets &drm_crtc_state.planes_changed to indicate that a CRTC has
980 * updated planes.
981 *
982 * RETURNS:
983 * Zero for success or -errno
984 */
985int
986drm_atomic_helper_check_planes(struct drm_device *dev,
987 struct drm_atomic_state *state)
988{
989 struct drm_crtc *crtc;
990 struct drm_crtc_state *new_crtc_state;
991 struct drm_plane *plane;
992 struct drm_plane_state *new_plane_state, *old_plane_state;
993 int i, ret = 0;
994
995 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
996 const struct drm_plane_helper_funcs *funcs;
997
998 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
999
1000 funcs = plane->helper_private;
1001
1002 drm_atomic_helper_plane_changed(state, old_plane_state, new_plane_state, plane);
1003
1004 drm_atomic_helper_check_plane_damage(state, new_plane_state);
1005
1006 if (!funcs || !funcs->atomic_check)
1007 continue;
1008
1009 ret = funcs->atomic_check(plane, state);
1010 if (ret) {
1011 drm_dbg_atomic(plane->dev,
1012 "[PLANE:%d:%s] atomic driver check failed\n",
1013 plane->base.id, plane->name);
1014 return ret;
1015 }
1016 }
1017
1018 for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1019 const struct drm_crtc_helper_funcs *funcs;
1020
1021 funcs = crtc->helper_private;
1022
1023 if (!funcs || !funcs->atomic_check)
1024 continue;
1025
1026 ret = funcs->atomic_check(crtc, state);
1027 if (ret) {
1028 drm_dbg_atomic(crtc->dev,
1029 "[CRTC:%d:%s] atomic driver check failed\n",
1030 crtc->base.id, crtc->name);
1031 return ret;
1032 }
1033 }
1034
1035 return ret;
1036}
1037EXPORT_SYMBOL(drm_atomic_helper_check_planes);
1038
1039/**
1040 * drm_atomic_helper_check - validate state object
1041 * @dev: DRM device
1042 * @state: the driver state object
1043 *
1044 * Check the state object to see if the requested state is physically possible.
1045 * Only CRTCs and planes have check callbacks, so for any additional (global)
1046 * checking that a driver needs it can simply wrap that around this function.
1047 * Drivers without such needs can directly use this as their
1048 * &drm_mode_config_funcs.atomic_check callback.
1049 *
1050 * This just wraps the two parts of the state checking for planes and modeset
1051 * state in the default order: First it calls drm_atomic_helper_check_modeset()
1052 * and then drm_atomic_helper_check_planes(). The assumption is that the
1053 * @drm_plane_helper_funcs.atomic_check and @drm_crtc_helper_funcs.atomic_check
1054 * functions depend upon an updated adjusted_mode.clock to e.g. properly compute
1055 * watermarks.
1056 *
1057 * Note that zpos normalization will add all enable planes to the state which
1058 * might not desired for some drivers.
1059 * For example enable/disable of a cursor plane which have fixed zpos value
1060 * would trigger all other enabled planes to be forced to the state change.
1061 *
1062 * RETURNS:
1063 * Zero for success or -errno
1064 */
1065int drm_atomic_helper_check(struct drm_device *dev,
1066 struct drm_atomic_state *state)
1067{
1068 int ret;
1069
1070 ret = drm_atomic_helper_check_modeset(dev, state);
1071 if (ret)
1072 return ret;
1073
1074 if (dev->mode_config.normalize_zpos) {
1075 ret = drm_atomic_normalize_zpos(dev, state);
1076 if (ret)
1077 return ret;
1078 }
1079
1080 ret = drm_atomic_helper_check_planes(dev, state);
1081 if (ret)
1082 return ret;
1083
1084 if (state->legacy_cursor_update)
1085 state->async_update = !drm_atomic_helper_async_check(dev, state);
1086
1087 drm_self_refresh_helper_alter_state(state);
1088
1089 return ret;
1090}
1091EXPORT_SYMBOL(drm_atomic_helper_check);
1092
1093static bool
1094crtc_needs_disable(struct drm_crtc_state *old_state,
1095 struct drm_crtc_state *new_state)
1096{
1097 /*
1098 * No new_state means the CRTC is off, so the only criteria is whether
1099 * it's currently active or in self refresh mode.
1100 */
1101 if (!new_state)
1102 return drm_atomic_crtc_effectively_active(old_state);
1103
1104 /*
1105 * We need to disable bridge(s) and CRTC if we're transitioning out of
1106 * self-refresh and changing CRTCs at the same time, because the
1107 * bridge tracks self-refresh status via CRTC state.
1108 */
1109 if (old_state->self_refresh_active &&
1110 old_state->crtc != new_state->crtc)
1111 return true;
1112
1113 /*
1114 * We also need to run through the crtc_funcs->disable() function if
1115 * the CRTC is currently on, if it's transitioning to self refresh
1116 * mode, or if it's in self refresh mode and needs to be fully
1117 * disabled.
1118 */
1119 return old_state->active ||
1120 (old_state->self_refresh_active && !new_state->active) ||
1121 new_state->self_refresh_active;
1122}
1123
1124static void
1125disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
1126{
1127 struct drm_connector *connector;
1128 struct drm_connector_state *old_conn_state, *new_conn_state;
1129 struct drm_crtc *crtc;
1130 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
1131 int i;
1132
1133 for_each_oldnew_connector_in_state(old_state, connector, old_conn_state, new_conn_state, i) {
1134 const struct drm_encoder_helper_funcs *funcs;
1135 struct drm_encoder *encoder;
1136 struct drm_bridge *bridge;
1137
1138 /*
1139 * Shut down everything that's in the changeset and currently
1140 * still on. So need to check the old, saved state.
1141 */
1142 if (!old_conn_state->crtc)
1143 continue;
1144
1145 old_crtc_state = drm_atomic_get_old_crtc_state(old_state, old_conn_state->crtc);
1146
1147 if (new_conn_state->crtc)
1148 new_crtc_state = drm_atomic_get_new_crtc_state(
1149 old_state,
1150 new_conn_state->crtc);
1151 else
1152 new_crtc_state = NULL;
1153
1154 if (!crtc_needs_disable(old_crtc_state, new_crtc_state) ||
1155 !drm_atomic_crtc_needs_modeset(old_conn_state->crtc->state))
1156 continue;
1157
1158 encoder = old_conn_state->best_encoder;
1159
1160 /* We shouldn't get this far if we didn't previously have
1161 * an encoder.. but WARN_ON() rather than explode.
1162 */
1163 if (WARN_ON(!encoder))
1164 continue;
1165
1166 funcs = encoder->helper_private;
1167
1168 drm_dbg_atomic(dev, "disabling [ENCODER:%d:%s]\n",
1169 encoder->base.id, encoder->name);
1170
1171 /*
1172 * Each encoder has at most one connector (since we always steal
1173 * it away), so we won't call disable hooks twice.
1174 */
1175 bridge = drm_bridge_chain_get_first_bridge(encoder);
1176 drm_atomic_bridge_chain_disable(bridge, old_state);
1177
1178 /* Right function depends upon target state. */
1179 if (funcs) {
1180 if (funcs->atomic_disable)
1181 funcs->atomic_disable(encoder, old_state);
1182 else if (new_conn_state->crtc && funcs->prepare)
1183 funcs->prepare(encoder);
1184 else if (funcs->disable)
1185 funcs->disable(encoder);
1186 else if (funcs->dpms)
1187 funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
1188 }
1189
1190 drm_atomic_bridge_chain_post_disable(bridge, old_state);
1191 }
1192
1193 for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
1194 const struct drm_crtc_helper_funcs *funcs;
1195 int ret;
1196
1197 /* Shut down everything that needs a full modeset. */
1198 if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
1199 continue;
1200
1201 if (!crtc_needs_disable(old_crtc_state, new_crtc_state))
1202 continue;
1203
1204 funcs = crtc->helper_private;
1205
1206 drm_dbg_atomic(dev, "disabling [CRTC:%d:%s]\n",
1207 crtc->base.id, crtc->name);
1208
1209
1210 /* Right function depends upon target state. */
1211 if (new_crtc_state->enable && funcs->prepare)
1212 funcs->prepare(crtc);
1213 else if (funcs->atomic_disable)
1214 funcs->atomic_disable(crtc, old_state);
1215 else if (funcs->disable)
1216 funcs->disable(crtc);
1217 else if (funcs->dpms)
1218 funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
1219
1220 if (!drm_dev_has_vblank(dev))
1221 continue;
1222
1223 ret = drm_crtc_vblank_get(crtc);
1224 /*
1225 * Self-refresh is not a true "disable"; ensure vblank remains
1226 * enabled.
1227 */
1228 if (new_crtc_state->self_refresh_active)
1229 WARN_ONCE(ret != 0,
1230 "driver disabled vblank in self-refresh\n");
1231 else
1232 WARN_ONCE(ret != -EINVAL,
1233 "driver forgot to call drm_crtc_vblank_off()\n");
1234 if (ret == 0)
1235 drm_crtc_vblank_put(crtc);
1236 }
1237}
1238
1239/**
1240 * drm_atomic_helper_update_legacy_modeset_state - update legacy modeset state
1241 * @dev: DRM device
1242 * @old_state: atomic state object with old state structures
1243 *
1244 * This function updates all the various legacy modeset state pointers in
1245 * connectors, encoders and CRTCs.
1246 *
1247 * Drivers can use this for building their own atomic commit if they don't have
1248 * a pure helper-based modeset implementation.
1249 *
1250 * Since these updates are not synchronized with lockings, only code paths
1251 * called from &drm_mode_config_helper_funcs.atomic_commit_tail can look at the
1252 * legacy state filled out by this helper. Defacto this means this helper and
1253 * the legacy state pointers are only really useful for transitioning an
1254 * existing driver to the atomic world.
1255 */
1256void
1257drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
1258 struct drm_atomic_state *old_state)
1259{
1260 struct drm_connector *connector;
1261 struct drm_connector_state *old_conn_state, *new_conn_state;
1262 struct drm_crtc *crtc;
1263 struct drm_crtc_state *new_crtc_state;
1264 int i;
1265
1266 /* clear out existing links and update dpms */
1267 for_each_oldnew_connector_in_state(old_state, connector, old_conn_state, new_conn_state, i) {
1268 if (connector->encoder) {
1269 WARN_ON(!connector->encoder->crtc);
1270
1271 connector->encoder->crtc = NULL;
1272 connector->encoder = NULL;
1273 }
1274
1275 crtc = new_conn_state->crtc;
1276 if ((!crtc && old_conn_state->crtc) ||
1277 (crtc && drm_atomic_crtc_needs_modeset(crtc->state))) {
1278 int mode = DRM_MODE_DPMS_OFF;
1279
1280 if (crtc && crtc->state->active)
1281 mode = DRM_MODE_DPMS_ON;
1282
1283 connector->dpms = mode;
1284 }
1285 }
1286
1287 /* set new links */
1288 for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
1289 if (!new_conn_state->crtc)
1290 continue;
1291
1292 if (WARN_ON(!new_conn_state->best_encoder))
1293 continue;
1294
1295 connector->encoder = new_conn_state->best_encoder;
1296 connector->encoder->crtc = new_conn_state->crtc;
1297 }
1298
1299 /* set legacy state in the crtc structure */
1300 for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
1301 struct drm_plane *primary = crtc->primary;
1302 struct drm_plane_state *new_plane_state;
1303
1304 crtc->mode = new_crtc_state->mode;
1305 crtc->enabled = new_crtc_state->enable;
1306
1307 new_plane_state =
1308 drm_atomic_get_new_plane_state(old_state, primary);
1309
1310 if (new_plane_state && new_plane_state->crtc == crtc) {
1311 crtc->x = new_plane_state->src_x >> 16;
1312 crtc->y = new_plane_state->src_y >> 16;
1313 }
1314 }
1315}
1316EXPORT_SYMBOL(drm_atomic_helper_update_legacy_modeset_state);
1317
1318/**
1319 * drm_atomic_helper_calc_timestamping_constants - update vblank timestamping constants
1320 * @state: atomic state object
1321 *
1322 * Updates the timestamping constants used for precise vblank timestamps
1323 * by calling drm_calc_timestamping_constants() for all enabled crtcs in @state.
1324 */
1325void drm_atomic_helper_calc_timestamping_constants(struct drm_atomic_state *state)
1326{
1327 struct drm_crtc_state *new_crtc_state;
1328 struct drm_crtc *crtc;
1329 int i;
1330
1331 for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1332 if (new_crtc_state->enable)
1333 drm_calc_timestamping_constants(crtc,
1334 &new_crtc_state->adjusted_mode);
1335 }
1336}
1337EXPORT_SYMBOL(drm_atomic_helper_calc_timestamping_constants);
1338
1339static void
1340crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
1341{
1342 struct drm_crtc *crtc;
1343 struct drm_crtc_state *new_crtc_state;
1344 struct drm_connector *connector;
1345 struct drm_connector_state *new_conn_state;
1346 int i;
1347
1348 for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
1349 const struct drm_crtc_helper_funcs *funcs;
1350
1351 if (!new_crtc_state->mode_changed)
1352 continue;
1353
1354 funcs = crtc->helper_private;
1355
1356 if (new_crtc_state->enable && funcs->mode_set_nofb) {
1357 drm_dbg_atomic(dev, "modeset on [CRTC:%d:%s]\n",
1358 crtc->base.id, crtc->name);
1359
1360 funcs->mode_set_nofb(crtc);
1361 }
1362 }
1363
1364 for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
1365 const struct drm_encoder_helper_funcs *funcs;
1366 struct drm_encoder *encoder;
1367 struct drm_display_mode *mode, *adjusted_mode;
1368 struct drm_bridge *bridge;
1369
1370 if (!new_conn_state->best_encoder)
1371 continue;
1372
1373 encoder = new_conn_state->best_encoder;
1374 funcs = encoder->helper_private;
1375 new_crtc_state = new_conn_state->crtc->state;
1376 mode = &new_crtc_state->mode;
1377 adjusted_mode = &new_crtc_state->adjusted_mode;
1378
1379 if (!new_crtc_state->mode_changed)
1380 continue;
1381
1382 drm_dbg_atomic(dev, "modeset on [ENCODER:%d:%s]\n",
1383 encoder->base.id, encoder->name);
1384
1385 /*
1386 * Each encoder has at most one connector (since we always steal
1387 * it away), so we won't call mode_set hooks twice.
1388 */
1389 if (funcs && funcs->atomic_mode_set) {
1390 funcs->atomic_mode_set(encoder, new_crtc_state,
1391 new_conn_state);
1392 } else if (funcs && funcs->mode_set) {
1393 funcs->mode_set(encoder, mode, adjusted_mode);
1394 }
1395
1396 bridge = drm_bridge_chain_get_first_bridge(encoder);
1397 drm_bridge_chain_mode_set(bridge, mode, adjusted_mode);
1398 }
1399}
1400
1401/**
1402 * drm_atomic_helper_commit_modeset_disables - modeset commit to disable outputs
1403 * @dev: DRM device
1404 * @old_state: atomic state object with old state structures
1405 *
1406 * This function shuts down all the outputs that need to be shut down and
1407 * prepares them (if required) with the new mode.
1408 *
1409 * For compatibility with legacy CRTC helpers this should be called before
1410 * drm_atomic_helper_commit_planes(), which is what the default commit function
1411 * does. But drivers with different needs can group the modeset commits together
1412 * and do the plane commits at the end. This is useful for drivers doing runtime
1413 * PM since planes updates then only happen when the CRTC is actually enabled.
1414 */
1415void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
1416 struct drm_atomic_state *old_state)
1417{
1418 disable_outputs(dev, old_state);
1419
1420 drm_atomic_helper_update_legacy_modeset_state(dev, old_state);
1421 drm_atomic_helper_calc_timestamping_constants(old_state);
1422
1423 crtc_set_mode(dev, old_state);
1424}
1425EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables);
1426
1427static void drm_atomic_helper_commit_writebacks(struct drm_device *dev,
1428 struct drm_atomic_state *old_state)
1429{
1430 struct drm_connector *connector;
1431 struct drm_connector_state *new_conn_state;
1432 int i;
1433
1434 for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
1435 const struct drm_connector_helper_funcs *funcs;
1436
1437 funcs = connector->helper_private;
1438 if (!funcs->atomic_commit)
1439 continue;
1440
1441 if (new_conn_state->writeback_job && new_conn_state->writeback_job->fb) {
1442 WARN_ON(connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK);
1443 funcs->atomic_commit(connector, old_state);
1444 }
1445 }
1446}
1447
1448/**
1449 * drm_atomic_helper_commit_modeset_enables - modeset commit to enable outputs
1450 * @dev: DRM device
1451 * @old_state: atomic state object with old state structures
1452 *
1453 * This function enables all the outputs with the new configuration which had to
1454 * be turned off for the update.
1455 *
1456 * For compatibility with legacy CRTC helpers this should be called after
1457 * drm_atomic_helper_commit_planes(), which is what the default commit function
1458 * does. But drivers with different needs can group the modeset commits together
1459 * and do the plane commits at the end. This is useful for drivers doing runtime
1460 * PM since planes updates then only happen when the CRTC is actually enabled.
1461 */
1462void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
1463 struct drm_atomic_state *old_state)
1464{
1465 struct drm_crtc *crtc;
1466 struct drm_crtc_state *old_crtc_state;
1467 struct drm_crtc_state *new_crtc_state;
1468 struct drm_connector *connector;
1469 struct drm_connector_state *new_conn_state;
1470 int i;
1471
1472 for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
1473 const struct drm_crtc_helper_funcs *funcs;
1474
1475 /* Need to filter out CRTCs where only planes change. */
1476 if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
1477 continue;
1478
1479 if (!new_crtc_state->active)
1480 continue;
1481
1482 funcs = crtc->helper_private;
1483
1484 if (new_crtc_state->enable) {
1485 drm_dbg_atomic(dev, "enabling [CRTC:%d:%s]\n",
1486 crtc->base.id, crtc->name);
1487 if (funcs->atomic_enable)
1488 funcs->atomic_enable(crtc, old_state);
1489 else if (funcs->commit)
1490 funcs->commit(crtc);
1491 }
1492 }
1493
1494 for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
1495 const struct drm_encoder_helper_funcs *funcs;
1496 struct drm_encoder *encoder;
1497 struct drm_bridge *bridge;
1498
1499 if (!new_conn_state->best_encoder)
1500 continue;
1501
1502 if (!new_conn_state->crtc->state->active ||
1503 !drm_atomic_crtc_needs_modeset(new_conn_state->crtc->state))
1504 continue;
1505
1506 encoder = new_conn_state->best_encoder;
1507 funcs = encoder->helper_private;
1508
1509 drm_dbg_atomic(dev, "enabling [ENCODER:%d:%s]\n",
1510 encoder->base.id, encoder->name);
1511
1512 /*
1513 * Each encoder has at most one connector (since we always steal
1514 * it away), so we won't call enable hooks twice.
1515 */
1516 bridge = drm_bridge_chain_get_first_bridge(encoder);
1517 drm_atomic_bridge_chain_pre_enable(bridge, old_state);
1518
1519 if (funcs) {
1520 if (funcs->atomic_enable)
1521 funcs->atomic_enable(encoder, old_state);
1522 else if (funcs->enable)
1523 funcs->enable(encoder);
1524 else if (funcs->commit)
1525 funcs->commit(encoder);
1526 }
1527
1528 drm_atomic_bridge_chain_enable(bridge, old_state);
1529 }
1530
1531 drm_atomic_helper_commit_writebacks(dev, old_state);
1532}
1533EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
1534
1535/*
1536 * For atomic updates which touch just a single CRTC, calculate the time of the
1537 * next vblank, and inform all the fences of the deadline.
1538 */
1539static void set_fence_deadline(struct drm_device *dev,
1540 struct drm_atomic_state *state)
1541{
1542 struct drm_crtc *crtc;
1543 struct drm_crtc_state *new_crtc_state;
1544 struct drm_plane *plane;
1545 struct drm_plane_state *new_plane_state;
1546 ktime_t vbltime = 0;
1547 int i;
1548
1549 for_each_new_crtc_in_state (state, crtc, new_crtc_state, i) {
1550 ktime_t v;
1551
1552 if (drm_atomic_crtc_needs_modeset(new_crtc_state))
1553 continue;
1554
1555 if (!new_crtc_state->active)
1556 continue;
1557
1558 if (drm_crtc_next_vblank_start(crtc, &v))
1559 continue;
1560
1561 if (!vbltime || ktime_before(v, vbltime))
1562 vbltime = v;
1563 }
1564
1565 /* If no CRTCs updated, then nothing to do: */
1566 if (!vbltime)
1567 return;
1568
1569 for_each_new_plane_in_state (state, plane, new_plane_state, i) {
1570 if (!new_plane_state->fence)
1571 continue;
1572 dma_fence_set_deadline(new_plane_state->fence, vbltime);
1573 }
1574}
1575
1576/**
1577 * drm_atomic_helper_wait_for_fences - wait for fences stashed in plane state
1578 * @dev: DRM device
1579 * @state: atomic state object with old state structures
1580 * @pre_swap: If true, do an interruptible wait, and @state is the new state.
1581 * Otherwise @state is the old state.
1582 *
1583 * For implicit sync, driver should fish the exclusive fence out from the
1584 * incoming fb's and stash it in the drm_plane_state. This is called after
1585 * drm_atomic_helper_swap_state() so it uses the current plane state (and
1586 * just uses the atomic state to find the changed planes)
1587 *
1588 * Note that @pre_swap is needed since the point where we block for fences moves
1589 * around depending upon whether an atomic commit is blocking or
1590 * non-blocking. For non-blocking commit all waiting needs to happen after
1591 * drm_atomic_helper_swap_state() is called, but for blocking commits we want
1592 * to wait **before** we do anything that can't be easily rolled back. That is
1593 * before we call drm_atomic_helper_swap_state().
1594 *
1595 * Returns zero if success or < 0 if dma_fence_wait() fails.
1596 */
1597int drm_atomic_helper_wait_for_fences(struct drm_device *dev,
1598 struct drm_atomic_state *state,
1599 bool pre_swap)
1600{
1601 struct drm_plane *plane;
1602 struct drm_plane_state *new_plane_state;
1603 int i, ret;
1604
1605 set_fence_deadline(dev, state);
1606
1607 for_each_new_plane_in_state(state, plane, new_plane_state, i) {
1608 if (!new_plane_state->fence)
1609 continue;
1610
1611 WARN_ON(!new_plane_state->fb);
1612
1613 /*
1614 * If waiting for fences pre-swap (ie: nonblock), userspace can
1615 * still interrupt the operation. Instead of blocking until the
1616 * timer expires, make the wait interruptible.
1617 */
1618 ret = dma_fence_wait(new_plane_state->fence, pre_swap);
1619 if (ret)
1620 return ret;
1621
1622 dma_fence_put(new_plane_state->fence);
1623 new_plane_state->fence = NULL;
1624 }
1625
1626 return 0;
1627}
1628EXPORT_SYMBOL(drm_atomic_helper_wait_for_fences);
1629
1630/**
1631 * drm_atomic_helper_wait_for_vblanks - wait for vblank on CRTCs
1632 * @dev: DRM device
1633 * @old_state: atomic state object with old state structures
1634 *
1635 * Helper to, after atomic commit, wait for vblanks on all affected
1636 * CRTCs (ie. before cleaning up old framebuffers using
1637 * drm_atomic_helper_cleanup_planes()). It will only wait on CRTCs where the
1638 * framebuffers have actually changed to optimize for the legacy cursor and
1639 * plane update use-case.
1640 *
1641 * Drivers using the nonblocking commit tracking support initialized by calling
1642 * drm_atomic_helper_setup_commit() should look at
1643 * drm_atomic_helper_wait_for_flip_done() as an alternative.
1644 */
1645void
1646drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
1647 struct drm_atomic_state *old_state)
1648{
1649 struct drm_crtc *crtc;
1650 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
1651 int i, ret;
1652 unsigned int crtc_mask = 0;
1653
1654 /*
1655 * Legacy cursor ioctls are completely unsynced, and userspace
1656 * relies on that (by doing tons of cursor updates).
1657 */
1658 if (old_state->legacy_cursor_update)
1659 return;
1660
1661 for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
1662 if (!new_crtc_state->active)
1663 continue;
1664
1665 ret = drm_crtc_vblank_get(crtc);
1666 if (ret != 0)
1667 continue;
1668
1669 crtc_mask |= drm_crtc_mask(crtc);
1670 old_state->crtcs[i].last_vblank_count = drm_crtc_vblank_count(crtc);
1671 }
1672
1673 for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
1674 if (!(crtc_mask & drm_crtc_mask(crtc)))
1675 continue;
1676
1677 ret = wait_event_timeout(dev->vblank[i].queue,
1678 old_state->crtcs[i].last_vblank_count !=
1679 drm_crtc_vblank_count(crtc),
1680 msecs_to_jiffies(100));
1681
1682 WARN(!ret, "[CRTC:%d:%s] vblank wait timed out\n",
1683 crtc->base.id, crtc->name);
1684
1685 drm_crtc_vblank_put(crtc);
1686 }
1687}
1688EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
1689
1690/**
1691 * drm_atomic_helper_wait_for_flip_done - wait for all page flips to be done
1692 * @dev: DRM device
1693 * @old_state: atomic state object with old state structures
1694 *
1695 * Helper to, after atomic commit, wait for page flips on all affected
1696 * crtcs (ie. before cleaning up old framebuffers using
1697 * drm_atomic_helper_cleanup_planes()). Compared to
1698 * drm_atomic_helper_wait_for_vblanks() this waits for the completion on all
1699 * CRTCs, assuming that cursors-only updates are signalling their completion
1700 * immediately (or using a different path).
1701 *
1702 * This requires that drivers use the nonblocking commit tracking support
1703 * initialized using drm_atomic_helper_setup_commit().
1704 */
1705void drm_atomic_helper_wait_for_flip_done(struct drm_device *dev,
1706 struct drm_atomic_state *old_state)
1707{
1708 struct drm_crtc *crtc;
1709 int i;
1710
1711 for (i = 0; i < dev->mode_config.num_crtc; i++) {
1712 struct drm_crtc_commit *commit = old_state->crtcs[i].commit;
1713 int ret;
1714
1715 crtc = old_state->crtcs[i].ptr;
1716
1717 if (!crtc || !commit)
1718 continue;
1719
1720 ret = wait_for_completion_timeout(&commit->flip_done, 10 * HZ);
1721 if (ret == 0)
1722 drm_err(dev, "[CRTC:%d:%s] flip_done timed out\n",
1723 crtc->base.id, crtc->name);
1724 }
1725
1726 if (old_state->fake_commit)
1727 complete_all(&old_state->fake_commit->flip_done);
1728}
1729EXPORT_SYMBOL(drm_atomic_helper_wait_for_flip_done);
1730
1731/**
1732 * drm_atomic_helper_commit_tail - commit atomic update to hardware
1733 * @old_state: atomic state object with old state structures
1734 *
1735 * This is the default implementation for the
1736 * &drm_mode_config_helper_funcs.atomic_commit_tail hook, for drivers
1737 * that do not support runtime_pm or do not need the CRTC to be
1738 * enabled to perform a commit. Otherwise, see
1739 * drm_atomic_helper_commit_tail_rpm().
1740 *
1741 * Note that the default ordering of how the various stages are called is to
1742 * match the legacy modeset helper library closest.
1743 */
1744void drm_atomic_helper_commit_tail(struct drm_atomic_state *old_state)
1745{
1746 struct drm_device *dev = old_state->dev;
1747
1748 drm_atomic_helper_commit_modeset_disables(dev, old_state);
1749
1750 drm_atomic_helper_commit_planes(dev, old_state, 0);
1751
1752 drm_atomic_helper_commit_modeset_enables(dev, old_state);
1753
1754 drm_atomic_helper_fake_vblank(old_state);
1755
1756 drm_atomic_helper_commit_hw_done(old_state);
1757
1758 drm_atomic_helper_wait_for_vblanks(dev, old_state);
1759
1760 drm_atomic_helper_cleanup_planes(dev, old_state);
1761}
1762EXPORT_SYMBOL(drm_atomic_helper_commit_tail);
1763
1764/**
1765 * drm_atomic_helper_commit_tail_rpm - commit atomic update to hardware
1766 * @old_state: new modeset state to be committed
1767 *
1768 * This is an alternative implementation for the
1769 * &drm_mode_config_helper_funcs.atomic_commit_tail hook, for drivers
1770 * that support runtime_pm or need the CRTC to be enabled to perform a
1771 * commit. Otherwise, one should use the default implementation
1772 * drm_atomic_helper_commit_tail().
1773 */
1774void drm_atomic_helper_commit_tail_rpm(struct drm_atomic_state *old_state)
1775{
1776 struct drm_device *dev = old_state->dev;
1777
1778 drm_atomic_helper_commit_modeset_disables(dev, old_state);
1779
1780 drm_atomic_helper_commit_modeset_enables(dev, old_state);
1781
1782 drm_atomic_helper_commit_planes(dev, old_state,
1783 DRM_PLANE_COMMIT_ACTIVE_ONLY);
1784
1785 drm_atomic_helper_fake_vblank(old_state);
1786
1787 drm_atomic_helper_commit_hw_done(old_state);
1788
1789 drm_atomic_helper_wait_for_vblanks(dev, old_state);
1790
1791 drm_atomic_helper_cleanup_planes(dev, old_state);
1792}
1793EXPORT_SYMBOL(drm_atomic_helper_commit_tail_rpm);
1794
1795static void commit_tail(struct drm_atomic_state *old_state)
1796{
1797 struct drm_device *dev = old_state->dev;
1798 const struct drm_mode_config_helper_funcs *funcs;
1799 struct drm_crtc_state *new_crtc_state;
1800 struct drm_crtc *crtc;
1801 ktime_t start;
1802 s64 commit_time_ms;
1803 unsigned int i, new_self_refresh_mask = 0;
1804
1805 funcs = dev->mode_config.helper_private;
1806
1807 /*
1808 * We're measuring the _entire_ commit, so the time will vary depending
1809 * on how many fences and objects are involved. For the purposes of self
1810 * refresh, this is desirable since it'll give us an idea of how
1811 * congested things are. This will inform our decision on how often we
1812 * should enter self refresh after idle.
1813 *
1814 * These times will be averaged out in the self refresh helpers to avoid
1815 * overreacting over one outlier frame
1816 */
1817 start = ktime_get();
1818
1819 drm_atomic_helper_wait_for_fences(dev, old_state, false);
1820
1821 drm_atomic_helper_wait_for_dependencies(old_state);
1822
1823 /*
1824 * We cannot safely access new_crtc_state after
1825 * drm_atomic_helper_commit_hw_done() so figure out which crtc's have
1826 * self-refresh active beforehand:
1827 */
1828 for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i)
1829 if (new_crtc_state->self_refresh_active)
1830 new_self_refresh_mask |= BIT(i);
1831
1832 if (funcs && funcs->atomic_commit_tail)
1833 funcs->atomic_commit_tail(old_state);
1834 else
1835 drm_atomic_helper_commit_tail(old_state);
1836
1837 commit_time_ms = ktime_ms_delta(ktime_get(), start);
1838 if (commit_time_ms > 0)
1839 drm_self_refresh_helper_update_avg_times(old_state,
1840 (unsigned long)commit_time_ms,
1841 new_self_refresh_mask);
1842
1843 drm_atomic_helper_commit_cleanup_done(old_state);
1844
1845 drm_atomic_state_put(old_state);
1846}
1847
1848static void commit_work(struct work_struct *work)
1849{
1850 struct drm_atomic_state *state = container_of(work,
1851 struct drm_atomic_state,
1852 commit_work);
1853 commit_tail(state);
1854}
1855
1856/**
1857 * drm_atomic_helper_async_check - check if state can be committed asynchronously
1858 * @dev: DRM device
1859 * @state: the driver state object
1860 *
1861 * This helper will check if it is possible to commit the state asynchronously.
1862 * Async commits are not supposed to swap the states like normal sync commits
1863 * but just do in-place changes on the current state.
1864 *
1865 * It will return 0 if the commit can happen in an asynchronous fashion or error
1866 * if not. Note that error just mean it can't be committed asynchronously, if it
1867 * fails the commit should be treated like a normal synchronous commit.
1868 */
1869int drm_atomic_helper_async_check(struct drm_device *dev,
1870 struct drm_atomic_state *state)
1871{
1872 struct drm_crtc *crtc;
1873 struct drm_crtc_state *crtc_state;
1874 struct drm_plane *plane = NULL;
1875 struct drm_plane_state *old_plane_state = NULL;
1876 struct drm_plane_state *new_plane_state = NULL;
1877 const struct drm_plane_helper_funcs *funcs;
1878 int i, ret, n_planes = 0;
1879
1880 for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1881 if (drm_atomic_crtc_needs_modeset(crtc_state))
1882 return -EINVAL;
1883 }
1884
1885 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i)
1886 n_planes++;
1887
1888 /* FIXME: we support only single plane updates for now */
1889 if (n_planes != 1) {
1890 drm_dbg_atomic(dev,
1891 "only single plane async updates are supported\n");
1892 return -EINVAL;
1893 }
1894
1895 if (!new_plane_state->crtc ||
1896 old_plane_state->crtc != new_plane_state->crtc) {
1897 drm_dbg_atomic(dev,
1898 "[PLANE:%d:%s] async update cannot change CRTC\n",
1899 plane->base.id, plane->name);
1900 return -EINVAL;
1901 }
1902
1903 funcs = plane->helper_private;
1904 if (!funcs->atomic_async_update) {
1905 drm_dbg_atomic(dev,
1906 "[PLANE:%d:%s] driver does not support async updates\n",
1907 plane->base.id, plane->name);
1908 return -EINVAL;
1909 }
1910
1911 if (new_plane_state->fence) {
1912 drm_dbg_atomic(dev,
1913 "[PLANE:%d:%s] missing fence for async update\n",
1914 plane->base.id, plane->name);
1915 return -EINVAL;
1916 }
1917
1918 /*
1919 * Don't do an async update if there is an outstanding commit modifying
1920 * the plane. This prevents our async update's changes from getting
1921 * overridden by a previous synchronous update's state.
1922 */
1923 if (old_plane_state->commit &&
1924 !try_wait_for_completion(&old_plane_state->commit->hw_done)) {
1925 drm_dbg_atomic(dev,
1926 "[PLANE:%d:%s] inflight previous commit preventing async commit\n",
1927 plane->base.id, plane->name);
1928 return -EBUSY;
1929 }
1930
1931 ret = funcs->atomic_async_check(plane, state);
1932 if (ret != 0)
1933 drm_dbg_atomic(dev,
1934 "[PLANE:%d:%s] driver async check failed\n",
1935 plane->base.id, plane->name);
1936 return ret;
1937}
1938EXPORT_SYMBOL(drm_atomic_helper_async_check);
1939
1940/**
1941 * drm_atomic_helper_async_commit - commit state asynchronously
1942 * @dev: DRM device
1943 * @state: the driver state object
1944 *
1945 * This function commits a state asynchronously, i.e., not vblank
1946 * synchronized. It should be used on a state only when
1947 * drm_atomic_async_check() succeeds. Async commits are not supposed to swap
1948 * the states like normal sync commits, but just do in-place changes on the
1949 * current state.
1950 *
1951 * TODO: Implement full swap instead of doing in-place changes.
1952 */
1953void drm_atomic_helper_async_commit(struct drm_device *dev,
1954 struct drm_atomic_state *state)
1955{
1956 struct drm_plane *plane;
1957 struct drm_plane_state *plane_state;
1958 const struct drm_plane_helper_funcs *funcs;
1959 int i;
1960
1961 for_each_new_plane_in_state(state, plane, plane_state, i) {
1962 struct drm_framebuffer *new_fb = plane_state->fb;
1963 struct drm_framebuffer *old_fb = plane->state->fb;
1964
1965 funcs = plane->helper_private;
1966 funcs->atomic_async_update(plane, state);
1967
1968 /*
1969 * ->atomic_async_update() is supposed to update the
1970 * plane->state in-place, make sure at least common
1971 * properties have been properly updated.
1972 */
1973 WARN_ON_ONCE(plane->state->fb != new_fb);
1974 WARN_ON_ONCE(plane->state->crtc_x != plane_state->crtc_x);
1975 WARN_ON_ONCE(plane->state->crtc_y != plane_state->crtc_y);
1976 WARN_ON_ONCE(plane->state->src_x != plane_state->src_x);
1977 WARN_ON_ONCE(plane->state->src_y != plane_state->src_y);
1978
1979 /*
1980 * Make sure the FBs have been swapped so that cleanups in the
1981 * new_state performs a cleanup in the old FB.
1982 */
1983 WARN_ON_ONCE(plane_state->fb != old_fb);
1984 }
1985}
1986EXPORT_SYMBOL(drm_atomic_helper_async_commit);
1987
1988/**
1989 * drm_atomic_helper_commit - commit validated state object
1990 * @dev: DRM device
1991 * @state: the driver state object
1992 * @nonblock: whether nonblocking behavior is requested.
1993 *
1994 * This function commits a with drm_atomic_helper_check() pre-validated state
1995 * object. This can still fail when e.g. the framebuffer reservation fails. This
1996 * function implements nonblocking commits, using
1997 * drm_atomic_helper_setup_commit() and related functions.
1998 *
1999 * Committing the actual hardware state is done through the
2000 * &drm_mode_config_helper_funcs.atomic_commit_tail callback, or its default
2001 * implementation drm_atomic_helper_commit_tail().
2002 *
2003 * RETURNS:
2004 * Zero for success or -errno.
2005 */
2006int drm_atomic_helper_commit(struct drm_device *dev,
2007 struct drm_atomic_state *state,
2008 bool nonblock)
2009{
2010 int ret;
2011
2012 if (state->async_update) {
2013 ret = drm_atomic_helper_prepare_planes(dev, state);
2014 if (ret)
2015 return ret;
2016
2017 drm_atomic_helper_async_commit(dev, state);
2018 drm_atomic_helper_unprepare_planes(dev, state);
2019
2020 return 0;
2021 }
2022
2023 ret = drm_atomic_helper_setup_commit(state, nonblock);
2024 if (ret)
2025 return ret;
2026
2027 INIT_WORK(&state->commit_work, commit_work);
2028
2029 ret = drm_atomic_helper_prepare_planes(dev, state);
2030 if (ret)
2031 return ret;
2032
2033 if (!nonblock) {
2034 ret = drm_atomic_helper_wait_for_fences(dev, state, true);
2035 if (ret)
2036 goto err;
2037 }
2038
2039 /*
2040 * This is the point of no return - everything below never fails except
2041 * when the hw goes bonghits. Which means we can commit the new state on
2042 * the software side now.
2043 */
2044
2045 ret = drm_atomic_helper_swap_state(state, true);
2046 if (ret)
2047 goto err;
2048
2049 /*
2050 * Everything below can be run asynchronously without the need to grab
2051 * any modeset locks at all under one condition: It must be guaranteed
2052 * that the asynchronous work has either been cancelled (if the driver
2053 * supports it, which at least requires that the framebuffers get
2054 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
2055 * before the new state gets committed on the software side with
2056 * drm_atomic_helper_swap_state().
2057 *
2058 * This scheme allows new atomic state updates to be prepared and
2059 * checked in parallel to the asynchronous completion of the previous
2060 * update. Which is important since compositors need to figure out the
2061 * composition of the next frame right after having submitted the
2062 * current layout.
2063 *
2064 * NOTE: Commit work has multiple phases, first hardware commit, then
2065 * cleanup. We want them to overlap, hence need system_unbound_wq to
2066 * make sure work items don't artificially stall on each another.
2067 */
2068
2069 drm_atomic_state_get(state);
2070 if (nonblock)
2071 queue_work(system_unbound_wq, &state->commit_work);
2072 else
2073 commit_tail(state);
2074
2075 return 0;
2076
2077err:
2078 drm_atomic_helper_unprepare_planes(dev, state);
2079 return ret;
2080}
2081EXPORT_SYMBOL(drm_atomic_helper_commit);
2082
2083/**
2084 * DOC: implementing nonblocking commit
2085 *
2086 * Nonblocking atomic commits should use struct &drm_crtc_commit to sequence
2087 * different operations against each another. Locks, especially struct
2088 * &drm_modeset_lock, should not be held in worker threads or any other
2089 * asynchronous context used to commit the hardware state.
2090 *
2091 * drm_atomic_helper_commit() implements the recommended sequence for
2092 * nonblocking commits, using drm_atomic_helper_setup_commit() internally:
2093 *
2094 * 1. Run drm_atomic_helper_prepare_planes(). Since this can fail and we
2095 * need to propagate out of memory/VRAM errors to userspace, it must be called
2096 * synchronously.
2097 *
2098 * 2. Synchronize with any outstanding nonblocking commit worker threads which
2099 * might be affected by the new state update. This is handled by
2100 * drm_atomic_helper_setup_commit().
2101 *
2102 * Asynchronous workers need to have sufficient parallelism to be able to run
2103 * different atomic commits on different CRTCs in parallel. The simplest way to
2104 * achieve this is by running them on the &system_unbound_wq work queue. Note
2105 * that drivers are not required to split up atomic commits and run an
2106 * individual commit in parallel - userspace is supposed to do that if it cares.
2107 * But it might be beneficial to do that for modesets, since those necessarily
2108 * must be done as one global operation, and enabling or disabling a CRTC can
2109 * take a long time. But even that is not required.
2110 *
2111 * IMPORTANT: A &drm_atomic_state update for multiple CRTCs is sequenced
2112 * against all CRTCs therein. Therefore for atomic state updates which only flip
2113 * planes the driver must not get the struct &drm_crtc_state of unrelated CRTCs
2114 * in its atomic check code: This would prevent committing of atomic updates to
2115 * multiple CRTCs in parallel. In general, adding additional state structures
2116 * should be avoided as much as possible, because this reduces parallelism in
2117 * (nonblocking) commits, both due to locking and due to commit sequencing
2118 * requirements.
2119 *
2120 * 3. The software state is updated synchronously with
2121 * drm_atomic_helper_swap_state(). Doing this under the protection of all modeset
2122 * locks means concurrent callers never see inconsistent state. Note that commit
2123 * workers do not hold any locks; their access is only coordinated through
2124 * ordering. If workers would access state only through the pointers in the
2125 * free-standing state objects (currently not the case for any driver) then even
2126 * multiple pending commits could be in-flight at the same time.
2127 *
2128 * 4. Schedule a work item to do all subsequent steps, using the split-out
2129 * commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and
2130 * then cleaning up the framebuffers after the old framebuffer is no longer
2131 * being displayed. The scheduled work should synchronize against other workers
2132 * using the &drm_crtc_commit infrastructure as needed. See
2133 * drm_atomic_helper_setup_commit() for more details.
2134 */
2135
2136static int stall_checks(struct drm_crtc *crtc, bool nonblock)
2137{
2138 struct drm_crtc_commit *commit, *stall_commit = NULL;
2139 bool completed = true;
2140 int i;
2141 long ret = 0;
2142
2143 spin_lock(&crtc->commit_lock);
2144 i = 0;
2145 list_for_each_entry(commit, &crtc->commit_list, commit_entry) {
2146 if (i == 0) {
2147 completed = try_wait_for_completion(&commit->flip_done);
2148 /*
2149 * Userspace is not allowed to get ahead of the previous
2150 * commit with nonblocking ones.
2151 */
2152 if (!completed && nonblock) {
2153 spin_unlock(&crtc->commit_lock);
2154 drm_dbg_atomic(crtc->dev,
2155 "[CRTC:%d:%s] busy with a previous commit\n",
2156 crtc->base.id, crtc->name);
2157
2158 return -EBUSY;
2159 }
2160 } else if (i == 1) {
2161 stall_commit = drm_crtc_commit_get(commit);
2162 break;
2163 }
2164
2165 i++;
2166 }
2167 spin_unlock(&crtc->commit_lock);
2168
2169 if (!stall_commit)
2170 return 0;
2171
2172 /* We don't want to let commits get ahead of cleanup work too much,
2173 * stalling on 2nd previous commit means triple-buffer won't ever stall.
2174 */
2175 ret = wait_for_completion_interruptible_timeout(&stall_commit->cleanup_done,
2176 10*HZ);
2177 if (ret == 0)
2178 drm_err(crtc->dev, "[CRTC:%d:%s] cleanup_done timed out\n",
2179 crtc->base.id, crtc->name);
2180
2181 drm_crtc_commit_put(stall_commit);
2182
2183 return ret < 0 ? ret : 0;
2184}
2185
2186static void release_crtc_commit(struct completion *completion)
2187{
2188 struct drm_crtc_commit *commit = container_of(completion,
2189 typeof(*commit),
2190 flip_done);
2191
2192 drm_crtc_commit_put(commit);
2193}
2194
2195static void init_commit(struct drm_crtc_commit *commit, struct drm_crtc *crtc)
2196{
2197 init_completion(&commit->flip_done);
2198 init_completion(&commit->hw_done);
2199 init_completion(&commit->cleanup_done);
2200 INIT_LIST_HEAD(&commit->commit_entry);
2201 kref_init(&commit->ref);
2202 commit->crtc = crtc;
2203}
2204
2205static struct drm_crtc_commit *
2206crtc_or_fake_commit(struct drm_atomic_state *state, struct drm_crtc *crtc)
2207{
2208 if (crtc) {
2209 struct drm_crtc_state *new_crtc_state;
2210
2211 new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
2212
2213 return new_crtc_state->commit;
2214 }
2215
2216 if (!state->fake_commit) {
2217 state->fake_commit = kzalloc(sizeof(*state->fake_commit), GFP_KERNEL);
2218 if (!state->fake_commit)
2219 return NULL;
2220
2221 init_commit(state->fake_commit, NULL);
2222 }
2223
2224 return state->fake_commit;
2225}
2226
2227/**
2228 * drm_atomic_helper_setup_commit - setup possibly nonblocking commit
2229 * @state: new modeset state to be committed
2230 * @nonblock: whether nonblocking behavior is requested.
2231 *
2232 * This function prepares @state to be used by the atomic helper's support for
2233 * nonblocking commits. Drivers using the nonblocking commit infrastructure
2234 * should always call this function from their
2235 * &drm_mode_config_funcs.atomic_commit hook.
2236 *
2237 * Drivers that need to extend the commit setup to private objects can use the
2238 * &drm_mode_config_helper_funcs.atomic_commit_setup hook.
2239 *
2240 * To be able to use this support drivers need to use a few more helper
2241 * functions. drm_atomic_helper_wait_for_dependencies() must be called before
2242 * actually committing the hardware state, and for nonblocking commits this call
2243 * must be placed in the async worker. See also drm_atomic_helper_swap_state()
2244 * and its stall parameter, for when a driver's commit hooks look at the
2245 * &drm_crtc.state, &drm_plane.state or &drm_connector.state pointer directly.
2246 *
2247 * Completion of the hardware commit step must be signalled using
2248 * drm_atomic_helper_commit_hw_done(). After this step the driver is not allowed
2249 * to read or change any permanent software or hardware modeset state. The only
2250 * exception is state protected by other means than &drm_modeset_lock locks.
2251 * Only the free standing @state with pointers to the old state structures can
2252 * be inspected, e.g. to clean up old buffers using
2253 * drm_atomic_helper_cleanup_planes().
2254 *
2255 * At the very end, before cleaning up @state drivers must call
2256 * drm_atomic_helper_commit_cleanup_done().
2257 *
2258 * This is all implemented by in drm_atomic_helper_commit(), giving drivers a
2259 * complete and easy-to-use default implementation of the atomic_commit() hook.
2260 *
2261 * The tracking of asynchronously executed and still pending commits is done
2262 * using the core structure &drm_crtc_commit.
2263 *
2264 * By default there's no need to clean up resources allocated by this function
2265 * explicitly: drm_atomic_state_default_clear() will take care of that
2266 * automatically.
2267 *
2268 * Returns:
2269 * 0 on success. -EBUSY when userspace schedules nonblocking commits too fast,
2270 * -ENOMEM on allocation failures and -EINTR when a signal is pending.
2271 */
2272int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
2273 bool nonblock)
2274{
2275 struct drm_crtc *crtc;
2276 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
2277 struct drm_connector *conn;
2278 struct drm_connector_state *old_conn_state, *new_conn_state;
2279 struct drm_plane *plane;
2280 struct drm_plane_state *old_plane_state, *new_plane_state;
2281 struct drm_crtc_commit *commit;
2282 const struct drm_mode_config_helper_funcs *funcs;
2283 int i, ret;
2284
2285 funcs = state->dev->mode_config.helper_private;
2286
2287 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
2288 commit = kzalloc(sizeof(*commit), GFP_KERNEL);
2289 if (!commit)
2290 return -ENOMEM;
2291
2292 init_commit(commit, crtc);
2293
2294 new_crtc_state->commit = commit;
2295
2296 ret = stall_checks(crtc, nonblock);
2297 if (ret)
2298 return ret;
2299
2300 /*
2301 * Drivers only send out events when at least either current or
2302 * new CRTC state is active. Complete right away if everything
2303 * stays off.
2304 */
2305 if (!old_crtc_state->active && !new_crtc_state->active) {
2306 complete_all(&commit->flip_done);
2307 continue;
2308 }
2309
2310 /* Legacy cursor updates are fully unsynced. */
2311 if (state->legacy_cursor_update) {
2312 complete_all(&commit->flip_done);
2313 continue;
2314 }
2315
2316 if (!new_crtc_state->event) {
2317 commit->event = kzalloc(sizeof(*commit->event),
2318 GFP_KERNEL);
2319 if (!commit->event)
2320 return -ENOMEM;
2321
2322 new_crtc_state->event = commit->event;
2323 }
2324
2325 new_crtc_state->event->base.completion = &commit->flip_done;
2326 new_crtc_state->event->base.completion_release = release_crtc_commit;
2327 drm_crtc_commit_get(commit);
2328
2329 commit->abort_completion = true;
2330
2331 state->crtcs[i].commit = commit;
2332 drm_crtc_commit_get(commit);
2333 }
2334
2335 for_each_oldnew_connector_in_state(state, conn, old_conn_state, new_conn_state, i) {
2336 /*
2337 * Userspace is not allowed to get ahead of the previous
2338 * commit with nonblocking ones.
2339 */
2340 if (nonblock && old_conn_state->commit &&
2341 !try_wait_for_completion(&old_conn_state->commit->flip_done)) {
2342 drm_dbg_atomic(conn->dev,
2343 "[CONNECTOR:%d:%s] busy with a previous commit\n",
2344 conn->base.id, conn->name);
2345
2346 return -EBUSY;
2347 }
2348
2349 /* Always track connectors explicitly for e.g. link retraining. */
2350 commit = crtc_or_fake_commit(state, new_conn_state->crtc ?: old_conn_state->crtc);
2351 if (!commit)
2352 return -ENOMEM;
2353
2354 new_conn_state->commit = drm_crtc_commit_get(commit);
2355 }
2356
2357 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
2358 /*
2359 * Userspace is not allowed to get ahead of the previous
2360 * commit with nonblocking ones.
2361 */
2362 if (nonblock && old_plane_state->commit &&
2363 !try_wait_for_completion(&old_plane_state->commit->flip_done)) {
2364 drm_dbg_atomic(plane->dev,
2365 "[PLANE:%d:%s] busy with a previous commit\n",
2366 plane->base.id, plane->name);
2367
2368 return -EBUSY;
2369 }
2370
2371 /* Always track planes explicitly for async pageflip support. */
2372 commit = crtc_or_fake_commit(state, new_plane_state->crtc ?: old_plane_state->crtc);
2373 if (!commit)
2374 return -ENOMEM;
2375
2376 new_plane_state->commit = drm_crtc_commit_get(commit);
2377 }
2378
2379 if (funcs && funcs->atomic_commit_setup)
2380 return funcs->atomic_commit_setup(state);
2381
2382 return 0;
2383}
2384EXPORT_SYMBOL(drm_atomic_helper_setup_commit);
2385
2386/**
2387 * drm_atomic_helper_wait_for_dependencies - wait for required preceding commits
2388 * @old_state: atomic state object with old state structures
2389 *
2390 * This function waits for all preceding commits that touch the same CRTC as
2391 * @old_state to both be committed to the hardware (as signalled by
2392 * drm_atomic_helper_commit_hw_done()) and executed by the hardware (as signalled
2393 * by calling drm_crtc_send_vblank_event() on the &drm_crtc_state.event).
2394 *
2395 * This is part of the atomic helper support for nonblocking commits, see
2396 * drm_atomic_helper_setup_commit() for an overview.
2397 */
2398void drm_atomic_helper_wait_for_dependencies(struct drm_atomic_state *old_state)
2399{
2400 struct drm_crtc *crtc;
2401 struct drm_crtc_state *old_crtc_state;
2402 struct drm_plane *plane;
2403 struct drm_plane_state *old_plane_state;
2404 struct drm_connector *conn;
2405 struct drm_connector_state *old_conn_state;
2406 int i;
2407 long ret;
2408
2409 for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
2410 ret = drm_crtc_commit_wait(old_crtc_state->commit);
2411 if (ret)
2412 drm_err(crtc->dev,
2413 "[CRTC:%d:%s] commit wait timed out\n",
2414 crtc->base.id, crtc->name);
2415 }
2416
2417 for_each_old_connector_in_state(old_state, conn, old_conn_state, i) {
2418 ret = drm_crtc_commit_wait(old_conn_state->commit);
2419 if (ret)
2420 drm_err(conn->dev,
2421 "[CONNECTOR:%d:%s] commit wait timed out\n",
2422 conn->base.id, conn->name);
2423 }
2424
2425 for_each_old_plane_in_state(old_state, plane, old_plane_state, i) {
2426 ret = drm_crtc_commit_wait(old_plane_state->commit);
2427 if (ret)
2428 drm_err(plane->dev,
2429 "[PLANE:%d:%s] commit wait timed out\n",
2430 plane->base.id, plane->name);
2431 }
2432}
2433EXPORT_SYMBOL(drm_atomic_helper_wait_for_dependencies);
2434
2435/**
2436 * drm_atomic_helper_fake_vblank - fake VBLANK events if needed
2437 * @old_state: atomic state object with old state structures
2438 *
2439 * This function walks all CRTCs and fakes VBLANK events on those with
2440 * &drm_crtc_state.no_vblank set to true and &drm_crtc_state.event != NULL.
2441 * The primary use of this function is writeback connectors working in oneshot
2442 * mode and faking VBLANK events. In this case they only fake the VBLANK event
2443 * when a job is queued, and any change to the pipeline that does not touch the
2444 * connector is leading to timeouts when calling
2445 * drm_atomic_helper_wait_for_vblanks() or
2446 * drm_atomic_helper_wait_for_flip_done(). In addition to writeback
2447 * connectors, this function can also fake VBLANK events for CRTCs without
2448 * VBLANK interrupt.
2449 *
2450 * This is part of the atomic helper support for nonblocking commits, see
2451 * drm_atomic_helper_setup_commit() for an overview.
2452 */
2453void drm_atomic_helper_fake_vblank(struct drm_atomic_state *old_state)
2454{
2455 struct drm_crtc_state *new_crtc_state;
2456 struct drm_crtc *crtc;
2457 int i;
2458
2459 for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
2460 unsigned long flags;
2461
2462 if (!new_crtc_state->no_vblank)
2463 continue;
2464
2465 spin_lock_irqsave(&old_state->dev->event_lock, flags);
2466 if (new_crtc_state->event) {
2467 drm_crtc_send_vblank_event(crtc,
2468 new_crtc_state->event);
2469 new_crtc_state->event = NULL;
2470 }
2471 spin_unlock_irqrestore(&old_state->dev->event_lock, flags);
2472 }
2473}
2474EXPORT_SYMBOL(drm_atomic_helper_fake_vblank);
2475
2476/**
2477 * drm_atomic_helper_commit_hw_done - setup possible nonblocking commit
2478 * @old_state: atomic state object with old state structures
2479 *
2480 * This function is used to signal completion of the hardware commit step. After
2481 * this step the driver is not allowed to read or change any permanent software
2482 * or hardware modeset state. The only exception is state protected by other
2483 * means than &drm_modeset_lock locks.
2484 *
2485 * Drivers should try to postpone any expensive or delayed cleanup work after
2486 * this function is called.
2487 *
2488 * This is part of the atomic helper support for nonblocking commits, see
2489 * drm_atomic_helper_setup_commit() for an overview.
2490 */
2491void drm_atomic_helper_commit_hw_done(struct drm_atomic_state *old_state)
2492{
2493 struct drm_crtc *crtc;
2494 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
2495 struct drm_crtc_commit *commit;
2496 int i;
2497
2498 for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
2499 commit = new_crtc_state->commit;
2500 if (!commit)
2501 continue;
2502
2503 /*
2504 * copy new_crtc_state->commit to old_crtc_state->commit,
2505 * it's unsafe to touch new_crtc_state after hw_done,
2506 * but we still need to do so in cleanup_done().
2507 */
2508 if (old_crtc_state->commit)
2509 drm_crtc_commit_put(old_crtc_state->commit);
2510
2511 old_crtc_state->commit = drm_crtc_commit_get(commit);
2512
2513 /* backend must have consumed any event by now */
2514 WARN_ON(new_crtc_state->event);
2515 complete_all(&commit->hw_done);
2516 }
2517
2518 if (old_state->fake_commit) {
2519 complete_all(&old_state->fake_commit->hw_done);
2520 complete_all(&old_state->fake_commit->flip_done);
2521 }
2522}
2523EXPORT_SYMBOL(drm_atomic_helper_commit_hw_done);
2524
2525/**
2526 * drm_atomic_helper_commit_cleanup_done - signal completion of commit
2527 * @old_state: atomic state object with old state structures
2528 *
2529 * This signals completion of the atomic update @old_state, including any
2530 * cleanup work. If used, it must be called right before calling
2531 * drm_atomic_state_put().
2532 *
2533 * This is part of the atomic helper support for nonblocking commits, see
2534 * drm_atomic_helper_setup_commit() for an overview.
2535 */
2536void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *old_state)
2537{
2538 struct drm_crtc *crtc;
2539 struct drm_crtc_state *old_crtc_state;
2540 struct drm_crtc_commit *commit;
2541 int i;
2542
2543 for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
2544 commit = old_crtc_state->commit;
2545 if (WARN_ON(!commit))
2546 continue;
2547
2548 complete_all(&commit->cleanup_done);
2549 WARN_ON(!try_wait_for_completion(&commit->hw_done));
2550
2551 spin_lock(&crtc->commit_lock);
2552 list_del(&commit->commit_entry);
2553 spin_unlock(&crtc->commit_lock);
2554 }
2555
2556 if (old_state->fake_commit) {
2557 complete_all(&old_state->fake_commit->cleanup_done);
2558 WARN_ON(!try_wait_for_completion(&old_state->fake_commit->hw_done));
2559 }
2560}
2561EXPORT_SYMBOL(drm_atomic_helper_commit_cleanup_done);
2562
2563/**
2564 * drm_atomic_helper_prepare_planes - prepare plane resources before commit
2565 * @dev: DRM device
2566 * @state: atomic state object with new state structures
2567 *
2568 * This function prepares plane state, specifically framebuffers, for the new
2569 * configuration, by calling &drm_plane_helper_funcs.prepare_fb. If any failure
2570 * is encountered this function will call &drm_plane_helper_funcs.cleanup_fb on
2571 * any already successfully prepared framebuffer.
2572 *
2573 * Returns:
2574 * 0 on success, negative error code on failure.
2575 */
2576int drm_atomic_helper_prepare_planes(struct drm_device *dev,
2577 struct drm_atomic_state *state)
2578{
2579 struct drm_connector *connector;
2580 struct drm_connector_state *new_conn_state;
2581 struct drm_plane *plane;
2582 struct drm_plane_state *new_plane_state;
2583 int ret, i, j;
2584
2585 for_each_new_connector_in_state(state, connector, new_conn_state, i) {
2586 if (!new_conn_state->writeback_job)
2587 continue;
2588
2589 ret = drm_writeback_prepare_job(new_conn_state->writeback_job);
2590 if (ret < 0)
2591 return ret;
2592 }
2593
2594 for_each_new_plane_in_state(state, plane, new_plane_state, i) {
2595 const struct drm_plane_helper_funcs *funcs;
2596
2597 funcs = plane->helper_private;
2598
2599 if (funcs->prepare_fb) {
2600 ret = funcs->prepare_fb(plane, new_plane_state);
2601 if (ret)
2602 goto fail_prepare_fb;
2603 } else {
2604 WARN_ON_ONCE(funcs->cleanup_fb);
2605
2606 if (!drm_core_check_feature(dev, DRIVER_GEM))
2607 continue;
2608
2609 ret = drm_gem_plane_helper_prepare_fb(plane, new_plane_state);
2610 if (ret)
2611 goto fail_prepare_fb;
2612 }
2613 }
2614
2615 for_each_new_plane_in_state(state, plane, new_plane_state, i) {
2616 const struct drm_plane_helper_funcs *funcs = plane->helper_private;
2617
2618 if (funcs->begin_fb_access) {
2619 ret = funcs->begin_fb_access(plane, new_plane_state);
2620 if (ret)
2621 goto fail_begin_fb_access;
2622 }
2623 }
2624
2625 return 0;
2626
2627fail_begin_fb_access:
2628 for_each_new_plane_in_state(state, plane, new_plane_state, j) {
2629 const struct drm_plane_helper_funcs *funcs = plane->helper_private;
2630
2631 if (j >= i)
2632 continue;
2633
2634 if (funcs->end_fb_access)
2635 funcs->end_fb_access(plane, new_plane_state);
2636 }
2637 i = j; /* set i to upper limit to cleanup all planes */
2638fail_prepare_fb:
2639 for_each_new_plane_in_state(state, plane, new_plane_state, j) {
2640 const struct drm_plane_helper_funcs *funcs;
2641
2642 if (j >= i)
2643 continue;
2644
2645 funcs = plane->helper_private;
2646
2647 if (funcs->cleanup_fb)
2648 funcs->cleanup_fb(plane, new_plane_state);
2649 }
2650
2651 return ret;
2652}
2653EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
2654
2655/**
2656 * drm_atomic_helper_unprepare_planes - release plane resources on aborts
2657 * @dev: DRM device
2658 * @state: atomic state object with old state structures
2659 *
2660 * This function cleans up plane state, specifically framebuffers, from the
2661 * atomic state. It undoes the effects of drm_atomic_helper_prepare_planes()
2662 * when aborting an atomic commit. For cleaning up after a successful commit
2663 * use drm_atomic_helper_cleanup_planes().
2664 */
2665void drm_atomic_helper_unprepare_planes(struct drm_device *dev,
2666 struct drm_atomic_state *state)
2667{
2668 struct drm_plane *plane;
2669 struct drm_plane_state *new_plane_state;
2670 int i;
2671
2672 for_each_new_plane_in_state(state, plane, new_plane_state, i) {
2673 const struct drm_plane_helper_funcs *funcs = plane->helper_private;
2674
2675 if (funcs->end_fb_access)
2676 funcs->end_fb_access(plane, new_plane_state);
2677 }
2678
2679 for_each_new_plane_in_state(state, plane, new_plane_state, i) {
2680 const struct drm_plane_helper_funcs *funcs = plane->helper_private;
2681
2682 if (funcs->cleanup_fb)
2683 funcs->cleanup_fb(plane, new_plane_state);
2684 }
2685}
2686EXPORT_SYMBOL(drm_atomic_helper_unprepare_planes);
2687
2688static bool plane_crtc_active(const struct drm_plane_state *state)
2689{
2690 return state->crtc && state->crtc->state->active;
2691}
2692
2693/**
2694 * drm_atomic_helper_commit_planes - commit plane state
2695 * @dev: DRM device
2696 * @old_state: atomic state object with old state structures
2697 * @flags: flags for committing plane state
2698 *
2699 * This function commits the new plane state using the plane and atomic helper
2700 * functions for planes and CRTCs. It assumes that the atomic state has already
2701 * been pushed into the relevant object state pointers, since this step can no
2702 * longer fail.
2703 *
2704 * It still requires the global state object @old_state to know which planes and
2705 * crtcs need to be updated though.
2706 *
2707 * Note that this function does all plane updates across all CRTCs in one step.
2708 * If the hardware can't support this approach look at
2709 * drm_atomic_helper_commit_planes_on_crtc() instead.
2710 *
2711 * Plane parameters can be updated by applications while the associated CRTC is
2712 * disabled. The DRM/KMS core will store the parameters in the plane state,
2713 * which will be available to the driver when the CRTC is turned on. As a result
2714 * most drivers don't need to be immediately notified of plane updates for a
2715 * disabled CRTC.
2716 *
2717 * Unless otherwise needed, drivers are advised to set the ACTIVE_ONLY flag in
2718 * @flags in order not to receive plane update notifications related to a
2719 * disabled CRTC. This avoids the need to manually ignore plane updates in
2720 * driver code when the driver and/or hardware can't or just don't need to deal
2721 * with updates on disabled CRTCs, for example when supporting runtime PM.
2722 *
2723 * Drivers may set the NO_DISABLE_AFTER_MODESET flag in @flags if the relevant
2724 * display controllers require to disable a CRTC's planes when the CRTC is
2725 * disabled. This function would skip the &drm_plane_helper_funcs.atomic_disable
2726 * call for a plane if the CRTC of the old plane state needs a modesetting
2727 * operation. Of course, the drivers need to disable the planes in their CRTC
2728 * disable callbacks since no one else would do that.
2729 *
2730 * The drm_atomic_helper_commit() default implementation doesn't set the
2731 * ACTIVE_ONLY flag to most closely match the behaviour of the legacy helpers.
2732 * This should not be copied blindly by drivers.
2733 */
2734void drm_atomic_helper_commit_planes(struct drm_device *dev,
2735 struct drm_atomic_state *old_state,
2736 uint32_t flags)
2737{
2738 struct drm_crtc *crtc;
2739 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
2740 struct drm_plane *plane;
2741 struct drm_plane_state *old_plane_state, *new_plane_state;
2742 int i;
2743 bool active_only = flags & DRM_PLANE_COMMIT_ACTIVE_ONLY;
2744 bool no_disable = flags & DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET;
2745
2746 for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
2747 const struct drm_crtc_helper_funcs *funcs;
2748
2749 funcs = crtc->helper_private;
2750
2751 if (!funcs || !funcs->atomic_begin)
2752 continue;
2753
2754 if (active_only && !new_crtc_state->active)
2755 continue;
2756
2757 funcs->atomic_begin(crtc, old_state);
2758 }
2759
2760 for_each_oldnew_plane_in_state(old_state, plane, old_plane_state, new_plane_state, i) {
2761 const struct drm_plane_helper_funcs *funcs;
2762 bool disabling;
2763
2764 funcs = plane->helper_private;
2765
2766 if (!funcs)
2767 continue;
2768
2769 disabling = drm_atomic_plane_disabling(old_plane_state,
2770 new_plane_state);
2771
2772 if (active_only) {
2773 /*
2774 * Skip planes related to inactive CRTCs. If the plane
2775 * is enabled use the state of the current CRTC. If the
2776 * plane is being disabled use the state of the old
2777 * CRTC to avoid skipping planes being disabled on an
2778 * active CRTC.
2779 */
2780 if (!disabling && !plane_crtc_active(new_plane_state))
2781 continue;
2782 if (disabling && !plane_crtc_active(old_plane_state))
2783 continue;
2784 }
2785
2786 /*
2787 * Special-case disabling the plane if drivers support it.
2788 */
2789 if (disabling && funcs->atomic_disable) {
2790 struct drm_crtc_state *crtc_state;
2791
2792 crtc_state = old_plane_state->crtc->state;
2793
2794 if (drm_atomic_crtc_needs_modeset(crtc_state) &&
2795 no_disable)
2796 continue;
2797
2798 funcs->atomic_disable(plane, old_state);
2799 } else if (new_plane_state->crtc || disabling) {
2800 funcs->atomic_update(plane, old_state);
2801
2802 if (!disabling && funcs->atomic_enable) {
2803 if (drm_atomic_plane_enabling(old_plane_state, new_plane_state))
2804 funcs->atomic_enable(plane, old_state);
2805 }
2806 }
2807 }
2808
2809 for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
2810 const struct drm_crtc_helper_funcs *funcs;
2811
2812 funcs = crtc->helper_private;
2813
2814 if (!funcs || !funcs->atomic_flush)
2815 continue;
2816
2817 if (active_only && !new_crtc_state->active)
2818 continue;
2819
2820 funcs->atomic_flush(crtc, old_state);
2821 }
2822
2823 /*
2824 * Signal end of framebuffer access here before hw_done. After hw_done,
2825 * a later commit might have already released the plane state.
2826 */
2827 for_each_old_plane_in_state(old_state, plane, old_plane_state, i) {
2828 const struct drm_plane_helper_funcs *funcs = plane->helper_private;
2829
2830 if (funcs->end_fb_access)
2831 funcs->end_fb_access(plane, old_plane_state);
2832 }
2833}
2834EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
2835
2836/**
2837 * drm_atomic_helper_commit_planes_on_crtc - commit plane state for a CRTC
2838 * @old_crtc_state: atomic state object with the old CRTC state
2839 *
2840 * This function commits the new plane state using the plane and atomic helper
2841 * functions for planes on the specific CRTC. It assumes that the atomic state
2842 * has already been pushed into the relevant object state pointers, since this
2843 * step can no longer fail.
2844 *
2845 * This function is useful when plane updates should be done CRTC-by-CRTC
2846 * instead of one global step like drm_atomic_helper_commit_planes() does.
2847 *
2848 * This function can only be savely used when planes are not allowed to move
2849 * between different CRTCs because this function doesn't handle inter-CRTC
2850 * dependencies. Callers need to ensure that either no such dependencies exist,
2851 * resolve them through ordering of commit calls or through some other means.
2852 */
2853void
2854drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state)
2855{
2856 const struct drm_crtc_helper_funcs *crtc_funcs;
2857 struct drm_crtc *crtc = old_crtc_state->crtc;
2858 struct drm_atomic_state *old_state = old_crtc_state->state;
2859 struct drm_crtc_state *new_crtc_state =
2860 drm_atomic_get_new_crtc_state(old_state, crtc);
2861 struct drm_plane *plane;
2862 unsigned int plane_mask;
2863
2864 plane_mask = old_crtc_state->plane_mask;
2865 plane_mask |= new_crtc_state->plane_mask;
2866
2867 crtc_funcs = crtc->helper_private;
2868 if (crtc_funcs && crtc_funcs->atomic_begin)
2869 crtc_funcs->atomic_begin(crtc, old_state);
2870
2871 drm_for_each_plane_mask(plane, crtc->dev, plane_mask) {
2872 struct drm_plane_state *old_plane_state =
2873 drm_atomic_get_old_plane_state(old_state, plane);
2874 struct drm_plane_state *new_plane_state =
2875 drm_atomic_get_new_plane_state(old_state, plane);
2876 const struct drm_plane_helper_funcs *plane_funcs;
2877 bool disabling;
2878
2879 plane_funcs = plane->helper_private;
2880
2881 if (!old_plane_state || !plane_funcs)
2882 continue;
2883
2884 WARN_ON(new_plane_state->crtc &&
2885 new_plane_state->crtc != crtc);
2886
2887 disabling = drm_atomic_plane_disabling(old_plane_state, new_plane_state);
2888
2889 if (disabling && plane_funcs->atomic_disable) {
2890 plane_funcs->atomic_disable(plane, old_state);
2891 } else if (new_plane_state->crtc || disabling) {
2892 plane_funcs->atomic_update(plane, old_state);
2893
2894 if (!disabling && plane_funcs->atomic_enable) {
2895 if (drm_atomic_plane_enabling(old_plane_state, new_plane_state))
2896 plane_funcs->atomic_enable(plane, old_state);
2897 }
2898 }
2899 }
2900
2901 if (crtc_funcs && crtc_funcs->atomic_flush)
2902 crtc_funcs->atomic_flush(crtc, old_state);
2903}
2904EXPORT_SYMBOL(drm_atomic_helper_commit_planes_on_crtc);
2905
2906/**
2907 * drm_atomic_helper_disable_planes_on_crtc - helper to disable CRTC's planes
2908 * @old_crtc_state: atomic state object with the old CRTC state
2909 * @atomic: if set, synchronize with CRTC's atomic_begin/flush hooks
2910 *
2911 * Disables all planes associated with the given CRTC. This can be
2912 * used for instance in the CRTC helper atomic_disable callback to disable
2913 * all planes.
2914 *
2915 * If the atomic-parameter is set the function calls the CRTC's
2916 * atomic_begin hook before and atomic_flush hook after disabling the
2917 * planes.
2918 *
2919 * It is a bug to call this function without having implemented the
2920 * &drm_plane_helper_funcs.atomic_disable plane hook.
2921 */
2922void
2923drm_atomic_helper_disable_planes_on_crtc(struct drm_crtc_state *old_crtc_state,
2924 bool atomic)
2925{
2926 struct drm_crtc *crtc = old_crtc_state->crtc;
2927 const struct drm_crtc_helper_funcs *crtc_funcs =
2928 crtc->helper_private;
2929 struct drm_plane *plane;
2930
2931 if (atomic && crtc_funcs && crtc_funcs->atomic_begin)
2932 crtc_funcs->atomic_begin(crtc, NULL);
2933
2934 drm_atomic_crtc_state_for_each_plane(plane, old_crtc_state) {
2935 const struct drm_plane_helper_funcs *plane_funcs =
2936 plane->helper_private;
2937
2938 if (!plane_funcs)
2939 continue;
2940
2941 WARN_ON(!plane_funcs->atomic_disable);
2942 if (plane_funcs->atomic_disable)
2943 plane_funcs->atomic_disable(plane, NULL);
2944 }
2945
2946 if (atomic && crtc_funcs && crtc_funcs->atomic_flush)
2947 crtc_funcs->atomic_flush(crtc, NULL);
2948}
2949EXPORT_SYMBOL(drm_atomic_helper_disable_planes_on_crtc);
2950
2951/**
2952 * drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
2953 * @dev: DRM device
2954 * @old_state: atomic state object with old state structures
2955 *
2956 * This function cleans up plane state, specifically framebuffers, from the old
2957 * configuration. Hence the old configuration must be perserved in @old_state to
2958 * be able to call this function.
2959 *
2960 * This function may not be called on the new state when the atomic update
2961 * fails at any point after calling drm_atomic_helper_prepare_planes(). Use
2962 * drm_atomic_helper_unprepare_planes() in this case.
2963 */
2964void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
2965 struct drm_atomic_state *old_state)
2966{
2967 struct drm_plane *plane;
2968 struct drm_plane_state *old_plane_state;
2969 int i;
2970
2971 for_each_old_plane_in_state(old_state, plane, old_plane_state, i) {
2972 const struct drm_plane_helper_funcs *funcs = plane->helper_private;
2973
2974 if (funcs->cleanup_fb)
2975 funcs->cleanup_fb(plane, old_plane_state);
2976 }
2977}
2978EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
2979
2980/**
2981 * drm_atomic_helper_swap_state - store atomic state into current sw state
2982 * @state: atomic state
2983 * @stall: stall for preceding commits
2984 *
2985 * This function stores the atomic state into the current state pointers in all
2986 * driver objects. It should be called after all failing steps have been done
2987 * and succeeded, but before the actual hardware state is committed.
2988 *
2989 * For cleanup and error recovery the current state for all changed objects will
2990 * be swapped into @state.
2991 *
2992 * With that sequence it fits perfectly into the plane prepare/cleanup sequence:
2993 *
2994 * 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state.
2995 *
2996 * 2. Do any other steps that might fail.
2997 *
2998 * 3. Put the staged state into the current state pointers with this function.
2999 *
3000 * 4. Actually commit the hardware state.
3001 *
3002 * 5. Call drm_atomic_helper_cleanup_planes() with @state, which since step 3
3003 * contains the old state. Also do any other cleanup required with that state.
3004 *
3005 * @stall must be set when nonblocking commits for this driver directly access
3006 * the &drm_plane.state, &drm_crtc.state or &drm_connector.state pointer. With
3007 * the current atomic helpers this is almost always the case, since the helpers
3008 * don't pass the right state structures to the callbacks.
3009 *
3010 * Returns:
3011 * Returns 0 on success. Can return -ERESTARTSYS when @stall is true and the
3012 * waiting for the previous commits has been interrupted.
3013 */
3014int drm_atomic_helper_swap_state(struct drm_atomic_state *state,
3015 bool stall)
3016{
3017 int i, ret;
3018 unsigned long flags = 0;
3019 struct drm_connector *connector;
3020 struct drm_connector_state *old_conn_state, *new_conn_state;
3021 struct drm_crtc *crtc;
3022 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
3023 struct drm_plane *plane;
3024 struct drm_plane_state *old_plane_state, *new_plane_state;
3025 struct drm_crtc_commit *commit;
3026 struct drm_private_obj *obj;
3027 struct drm_private_state *old_obj_state, *new_obj_state;
3028
3029 if (stall) {
3030 /*
3031 * We have to stall for hw_done here before
3032 * drm_atomic_helper_wait_for_dependencies() because flip
3033 * depth > 1 is not yet supported by all drivers. As long as
3034 * obj->state is directly dereferenced anywhere in the drivers
3035 * atomic_commit_tail function, then it's unsafe to swap state
3036 * before drm_atomic_helper_commit_hw_done() is called.
3037 */
3038
3039 for_each_old_crtc_in_state(state, crtc, old_crtc_state, i) {
3040 commit = old_crtc_state->commit;
3041
3042 if (!commit)
3043 continue;
3044
3045 ret = wait_for_completion_interruptible(&commit->hw_done);
3046 if (ret)
3047 return ret;
3048 }
3049
3050 for_each_old_connector_in_state(state, connector, old_conn_state, i) {
3051 commit = old_conn_state->commit;
3052
3053 if (!commit)
3054 continue;
3055
3056 ret = wait_for_completion_interruptible(&commit->hw_done);
3057 if (ret)
3058 return ret;
3059 }
3060
3061 for_each_old_plane_in_state(state, plane, old_plane_state, i) {
3062 commit = old_plane_state->commit;
3063
3064 if (!commit)
3065 continue;
3066
3067 ret = wait_for_completion_interruptible(&commit->hw_done);
3068 if (ret)
3069 return ret;
3070 }
3071 }
3072
3073 for_each_oldnew_connector_in_state(state, connector, old_conn_state, new_conn_state, i) {
3074 WARN_ON(connector->state != old_conn_state);
3075
3076 old_conn_state->state = state;
3077 new_conn_state->state = NULL;
3078
3079 state->connectors[i].state = old_conn_state;
3080 connector->state = new_conn_state;
3081 }
3082
3083 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
3084 WARN_ON(crtc->state != old_crtc_state);
3085
3086 old_crtc_state->state = state;
3087 new_crtc_state->state = NULL;
3088
3089 state->crtcs[i].state = old_crtc_state;
3090 crtc->state = new_crtc_state;
3091
3092 if (new_crtc_state->commit) {
3093 spin_lock(&crtc->commit_lock);
3094 list_add(&new_crtc_state->commit->commit_entry,
3095 &crtc->commit_list);
3096 spin_unlock(&crtc->commit_lock);
3097
3098 new_crtc_state->commit->event = NULL;
3099 }
3100 }
3101
3102 drm_panic_lock(state->dev, flags);
3103 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
3104 WARN_ON(plane->state != old_plane_state);
3105
3106 old_plane_state->state = state;
3107 new_plane_state->state = NULL;
3108
3109 state->planes[i].state = old_plane_state;
3110 plane->state = new_plane_state;
3111 }
3112 drm_panic_unlock(state->dev, flags);
3113
3114 for_each_oldnew_private_obj_in_state(state, obj, old_obj_state, new_obj_state, i) {
3115 WARN_ON(obj->state != old_obj_state);
3116
3117 old_obj_state->state = state;
3118 new_obj_state->state = NULL;
3119
3120 state->private_objs[i].state = old_obj_state;
3121 obj->state = new_obj_state;
3122 }
3123
3124 return 0;
3125}
3126EXPORT_SYMBOL(drm_atomic_helper_swap_state);
3127
3128/**
3129 * drm_atomic_helper_update_plane - Helper for primary plane update using atomic
3130 * @plane: plane object to update
3131 * @crtc: owning CRTC of owning plane
3132 * @fb: framebuffer to flip onto plane
3133 * @crtc_x: x offset of primary plane on @crtc
3134 * @crtc_y: y offset of primary plane on @crtc
3135 * @crtc_w: width of primary plane rectangle on @crtc
3136 * @crtc_h: height of primary plane rectangle on @crtc
3137 * @src_x: x offset of @fb for panning
3138 * @src_y: y offset of @fb for panning
3139 * @src_w: width of source rectangle in @fb
3140 * @src_h: height of source rectangle in @fb
3141 * @ctx: lock acquire context
3142 *
3143 * Provides a default plane update handler using the atomic driver interface.
3144 *
3145 * RETURNS:
3146 * Zero on success, error code on failure
3147 */
3148int drm_atomic_helper_update_plane(struct drm_plane *plane,
3149 struct drm_crtc *crtc,
3150 struct drm_framebuffer *fb,
3151 int crtc_x, int crtc_y,
3152 unsigned int crtc_w, unsigned int crtc_h,
3153 uint32_t src_x, uint32_t src_y,
3154 uint32_t src_w, uint32_t src_h,
3155 struct drm_modeset_acquire_ctx *ctx)
3156{
3157 struct drm_atomic_state *state;
3158 struct drm_plane_state *plane_state;
3159 int ret = 0;
3160
3161 state = drm_atomic_state_alloc(plane->dev);
3162 if (!state)
3163 return -ENOMEM;
3164
3165 state->acquire_ctx = ctx;
3166 plane_state = drm_atomic_get_plane_state(state, plane);
3167 if (IS_ERR(plane_state)) {
3168 ret = PTR_ERR(plane_state);
3169 goto fail;
3170 }
3171
3172 ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
3173 if (ret != 0)
3174 goto fail;
3175 drm_atomic_set_fb_for_plane(plane_state, fb);
3176 plane_state->crtc_x = crtc_x;
3177 plane_state->crtc_y = crtc_y;
3178 plane_state->crtc_w = crtc_w;
3179 plane_state->crtc_h = crtc_h;
3180 plane_state->src_x = src_x;
3181 plane_state->src_y = src_y;
3182 plane_state->src_w = src_w;
3183 plane_state->src_h = src_h;
3184
3185 if (plane == crtc->cursor)
3186 state->legacy_cursor_update = true;
3187
3188 ret = drm_atomic_commit(state);
3189fail:
3190 drm_atomic_state_put(state);
3191 return ret;
3192}
3193EXPORT_SYMBOL(drm_atomic_helper_update_plane);
3194
3195/**
3196 * drm_atomic_helper_disable_plane - Helper for primary plane disable using atomic
3197 * @plane: plane to disable
3198 * @ctx: lock acquire context
3199 *
3200 * Provides a default plane disable handler using the atomic driver interface.
3201 *
3202 * RETURNS:
3203 * Zero on success, error code on failure
3204 */
3205int drm_atomic_helper_disable_plane(struct drm_plane *plane,
3206 struct drm_modeset_acquire_ctx *ctx)
3207{
3208 struct drm_atomic_state *state;
3209 struct drm_plane_state *plane_state;
3210 int ret = 0;
3211
3212 state = drm_atomic_state_alloc(plane->dev);
3213 if (!state)
3214 return -ENOMEM;
3215
3216 state->acquire_ctx = ctx;
3217 plane_state = drm_atomic_get_plane_state(state, plane);
3218 if (IS_ERR(plane_state)) {
3219 ret = PTR_ERR(plane_state);
3220 goto fail;
3221 }
3222
3223 if (plane_state->crtc && plane_state->crtc->cursor == plane)
3224 plane_state->state->legacy_cursor_update = true;
3225
3226 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
3227 if (ret != 0)
3228 goto fail;
3229
3230 ret = drm_atomic_commit(state);
3231fail:
3232 drm_atomic_state_put(state);
3233 return ret;
3234}
3235EXPORT_SYMBOL(drm_atomic_helper_disable_plane);
3236
3237/**
3238 * drm_atomic_helper_set_config - set a new config from userspace
3239 * @set: mode set configuration
3240 * @ctx: lock acquisition context
3241 *
3242 * Provides a default CRTC set_config handler using the atomic driver interface.
3243 *
3244 * NOTE: For backwards compatibility with old userspace this automatically
3245 * resets the "link-status" property to GOOD, to force any link
3246 * re-training. The SETCRTC ioctl does not define whether an update does
3247 * need a full modeset or just a plane update, hence we're allowed to do
3248 * that. See also drm_connector_set_link_status_property().
3249 *
3250 * Returns:
3251 * Returns 0 on success, negative errno numbers on failure.
3252 */
3253int drm_atomic_helper_set_config(struct drm_mode_set *set,
3254 struct drm_modeset_acquire_ctx *ctx)
3255{
3256 struct drm_atomic_state *state;
3257 struct drm_crtc *crtc = set->crtc;
3258 int ret = 0;
3259
3260 state = drm_atomic_state_alloc(crtc->dev);
3261 if (!state)
3262 return -ENOMEM;
3263
3264 state->acquire_ctx = ctx;
3265 ret = __drm_atomic_helper_set_config(set, state);
3266 if (ret != 0)
3267 goto fail;
3268
3269 ret = handle_conflicting_encoders(state, true);
3270 if (ret)
3271 goto fail;
3272
3273 ret = drm_atomic_commit(state);
3274
3275fail:
3276 drm_atomic_state_put(state);
3277 return ret;
3278}
3279EXPORT_SYMBOL(drm_atomic_helper_set_config);
3280
3281/**
3282 * drm_atomic_helper_disable_all - disable all currently active outputs
3283 * @dev: DRM device
3284 * @ctx: lock acquisition context
3285 *
3286 * Loops through all connectors, finding those that aren't turned off and then
3287 * turns them off by setting their DPMS mode to OFF and deactivating the CRTC
3288 * that they are connected to.
3289 *
3290 * This is used for example in suspend/resume to disable all currently active
3291 * functions when suspending. If you just want to shut down everything at e.g.
3292 * driver unload, look at drm_atomic_helper_shutdown().
3293 *
3294 * Note that if callers haven't already acquired all modeset locks this might
3295 * return -EDEADLK, which must be handled by calling drm_modeset_backoff().
3296 *
3297 * Returns:
3298 * 0 on success or a negative error code on failure.
3299 *
3300 * See also:
3301 * drm_atomic_helper_suspend(), drm_atomic_helper_resume() and
3302 * drm_atomic_helper_shutdown().
3303 */
3304int drm_atomic_helper_disable_all(struct drm_device *dev,
3305 struct drm_modeset_acquire_ctx *ctx)
3306{
3307 struct drm_atomic_state *state;
3308 struct drm_connector_state *conn_state;
3309 struct drm_connector *conn;
3310 struct drm_plane_state *plane_state;
3311 struct drm_plane *plane;
3312 struct drm_crtc_state *crtc_state;
3313 struct drm_crtc *crtc;
3314 int ret, i;
3315
3316 state = drm_atomic_state_alloc(dev);
3317 if (!state)
3318 return -ENOMEM;
3319
3320 state->acquire_ctx = ctx;
3321
3322 drm_for_each_crtc(crtc, dev) {
3323 crtc_state = drm_atomic_get_crtc_state(state, crtc);
3324 if (IS_ERR(crtc_state)) {
3325 ret = PTR_ERR(crtc_state);
3326 goto free;
3327 }
3328
3329 crtc_state->active = false;
3330
3331 ret = drm_atomic_set_mode_prop_for_crtc(crtc_state, NULL);
3332 if (ret < 0)
3333 goto free;
3334
3335 ret = drm_atomic_add_affected_planes(state, crtc);
3336 if (ret < 0)
3337 goto free;
3338
3339 ret = drm_atomic_add_affected_connectors(state, crtc);
3340 if (ret < 0)
3341 goto free;
3342 }
3343
3344 for_each_new_connector_in_state(state, conn, conn_state, i) {
3345 ret = drm_atomic_set_crtc_for_connector(conn_state, NULL);
3346 if (ret < 0)
3347 goto free;
3348 }
3349
3350 for_each_new_plane_in_state(state, plane, plane_state, i) {
3351 ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
3352 if (ret < 0)
3353 goto free;
3354
3355 drm_atomic_set_fb_for_plane(plane_state, NULL);
3356 }
3357
3358 ret = drm_atomic_commit(state);
3359free:
3360 drm_atomic_state_put(state);
3361 return ret;
3362}
3363EXPORT_SYMBOL(drm_atomic_helper_disable_all);
3364
3365/**
3366 * drm_atomic_helper_shutdown - shutdown all CRTC
3367 * @dev: DRM device
3368 *
3369 * This shuts down all CRTC, which is useful for driver unloading. Shutdown on
3370 * suspend should instead be handled with drm_atomic_helper_suspend(), since
3371 * that also takes a snapshot of the modeset state to be restored on resume.
3372 *
3373 * This is just a convenience wrapper around drm_atomic_helper_disable_all(),
3374 * and it is the atomic version of drm_helper_force_disable_all().
3375 */
3376void drm_atomic_helper_shutdown(struct drm_device *dev)
3377{
3378 struct drm_modeset_acquire_ctx ctx;
3379 int ret;
3380
3381 if (dev == NULL)
3382 return;
3383
3384 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
3385
3386 ret = drm_atomic_helper_disable_all(dev, &ctx);
3387 if (ret)
3388 drm_err(dev,
3389 "Disabling all crtc's during unload failed with %i\n",
3390 ret);
3391
3392 DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
3393}
3394EXPORT_SYMBOL(drm_atomic_helper_shutdown);
3395
3396/**
3397 * drm_atomic_helper_duplicate_state - duplicate an atomic state object
3398 * @dev: DRM device
3399 * @ctx: lock acquisition context
3400 *
3401 * Makes a copy of the current atomic state by looping over all objects and
3402 * duplicating their respective states. This is used for example by suspend/
3403 * resume support code to save the state prior to suspend such that it can
3404 * be restored upon resume.
3405 *
3406 * Note that this treats atomic state as persistent between save and restore.
3407 * Drivers must make sure that this is possible and won't result in confusion
3408 * or erroneous behaviour.
3409 *
3410 * Note that if callers haven't already acquired all modeset locks this might
3411 * return -EDEADLK, which must be handled by calling drm_modeset_backoff().
3412 *
3413 * Returns:
3414 * A pointer to the copy of the atomic state object on success or an
3415 * ERR_PTR()-encoded error code on failure.
3416 *
3417 * See also:
3418 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
3419 */
3420struct drm_atomic_state *
3421drm_atomic_helper_duplicate_state(struct drm_device *dev,
3422 struct drm_modeset_acquire_ctx *ctx)
3423{
3424 struct drm_atomic_state *state;
3425 struct drm_connector *conn;
3426 struct drm_connector_list_iter conn_iter;
3427 struct drm_plane *plane;
3428 struct drm_crtc *crtc;
3429 int err = 0;
3430
3431 state = drm_atomic_state_alloc(dev);
3432 if (!state)
3433 return ERR_PTR(-ENOMEM);
3434
3435 state->acquire_ctx = ctx;
3436 state->duplicated = true;
3437
3438 drm_for_each_crtc(crtc, dev) {
3439 struct drm_crtc_state *crtc_state;
3440
3441 crtc_state = drm_atomic_get_crtc_state(state, crtc);
3442 if (IS_ERR(crtc_state)) {
3443 err = PTR_ERR(crtc_state);
3444 goto free;
3445 }
3446 }
3447
3448 drm_for_each_plane(plane, dev) {
3449 struct drm_plane_state *plane_state;
3450
3451 plane_state = drm_atomic_get_plane_state(state, plane);
3452 if (IS_ERR(plane_state)) {
3453 err = PTR_ERR(plane_state);
3454 goto free;
3455 }
3456 }
3457
3458 drm_connector_list_iter_begin(dev, &conn_iter);
3459 drm_for_each_connector_iter(conn, &conn_iter) {
3460 struct drm_connector_state *conn_state;
3461
3462 conn_state = drm_atomic_get_connector_state(state, conn);
3463 if (IS_ERR(conn_state)) {
3464 err = PTR_ERR(conn_state);
3465 drm_connector_list_iter_end(&conn_iter);
3466 goto free;
3467 }
3468 }
3469 drm_connector_list_iter_end(&conn_iter);
3470
3471 /* clear the acquire context so that it isn't accidentally reused */
3472 state->acquire_ctx = NULL;
3473
3474free:
3475 if (err < 0) {
3476 drm_atomic_state_put(state);
3477 state = ERR_PTR(err);
3478 }
3479
3480 return state;
3481}
3482EXPORT_SYMBOL(drm_atomic_helper_duplicate_state);
3483
3484/**
3485 * drm_atomic_helper_suspend - subsystem-level suspend helper
3486 * @dev: DRM device
3487 *
3488 * Duplicates the current atomic state, disables all active outputs and then
3489 * returns a pointer to the original atomic state to the caller. Drivers can
3490 * pass this pointer to the drm_atomic_helper_resume() helper upon resume to
3491 * restore the output configuration that was active at the time the system
3492 * entered suspend.
3493 *
3494 * Note that it is potentially unsafe to use this. The atomic state object
3495 * returned by this function is assumed to be persistent. Drivers must ensure
3496 * that this holds true. Before calling this function, drivers must make sure
3497 * to suspend fbdev emulation so that nothing can be using the device.
3498 *
3499 * Returns:
3500 * A pointer to a copy of the state before suspend on success or an ERR_PTR()-
3501 * encoded error code on failure. Drivers should store the returned atomic
3502 * state object and pass it to the drm_atomic_helper_resume() helper upon
3503 * resume.
3504 *
3505 * See also:
3506 * drm_atomic_helper_duplicate_state(), drm_atomic_helper_disable_all(),
3507 * drm_atomic_helper_resume(), drm_atomic_helper_commit_duplicated_state()
3508 */
3509struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev)
3510{
3511 struct drm_modeset_acquire_ctx ctx;
3512 struct drm_atomic_state *state;
3513 int err;
3514
3515 /* This can never be returned, but it makes the compiler happy */
3516 state = ERR_PTR(-EINVAL);
3517
3518 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, err);
3519
3520 state = drm_atomic_helper_duplicate_state(dev, &ctx);
3521 if (IS_ERR(state))
3522 goto unlock;
3523
3524 err = drm_atomic_helper_disable_all(dev, &ctx);
3525 if (err < 0) {
3526 drm_atomic_state_put(state);
3527 state = ERR_PTR(err);
3528 goto unlock;
3529 }
3530
3531unlock:
3532 DRM_MODESET_LOCK_ALL_END(dev, ctx, err);
3533 if (err)
3534 return ERR_PTR(err);
3535
3536 return state;
3537}
3538EXPORT_SYMBOL(drm_atomic_helper_suspend);
3539
3540/**
3541 * drm_atomic_helper_commit_duplicated_state - commit duplicated state
3542 * @state: duplicated atomic state to commit
3543 * @ctx: pointer to acquire_ctx to use for commit.
3544 *
3545 * The state returned by drm_atomic_helper_duplicate_state() and
3546 * drm_atomic_helper_suspend() is partially invalid, and needs to
3547 * be fixed up before commit.
3548 *
3549 * Returns:
3550 * 0 on success or a negative error code on failure.
3551 *
3552 * See also:
3553 * drm_atomic_helper_suspend()
3554 */
3555int drm_atomic_helper_commit_duplicated_state(struct drm_atomic_state *state,
3556 struct drm_modeset_acquire_ctx *ctx)
3557{
3558 int i, ret;
3559 struct drm_plane *plane;
3560 struct drm_plane_state *new_plane_state;
3561 struct drm_connector *connector;
3562 struct drm_connector_state *new_conn_state;
3563 struct drm_crtc *crtc;
3564 struct drm_crtc_state *new_crtc_state;
3565
3566 state->acquire_ctx = ctx;
3567
3568 for_each_new_plane_in_state(state, plane, new_plane_state, i)
3569 state->planes[i].old_state = plane->state;
3570
3571 for_each_new_crtc_in_state(state, crtc, new_crtc_state, i)
3572 state->crtcs[i].old_state = crtc->state;
3573
3574 for_each_new_connector_in_state(state, connector, new_conn_state, i)
3575 state->connectors[i].old_state = connector->state;
3576
3577 ret = drm_atomic_commit(state);
3578
3579 state->acquire_ctx = NULL;
3580
3581 return ret;
3582}
3583EXPORT_SYMBOL(drm_atomic_helper_commit_duplicated_state);
3584
3585/**
3586 * drm_atomic_helper_resume - subsystem-level resume helper
3587 * @dev: DRM device
3588 * @state: atomic state to resume to
3589 *
3590 * Calls drm_mode_config_reset() to synchronize hardware and software states,
3591 * grabs all modeset locks and commits the atomic state object. This can be
3592 * used in conjunction with the drm_atomic_helper_suspend() helper to
3593 * implement suspend/resume for drivers that support atomic mode-setting.
3594 *
3595 * Returns:
3596 * 0 on success or a negative error code on failure.
3597 *
3598 * See also:
3599 * drm_atomic_helper_suspend()
3600 */
3601int drm_atomic_helper_resume(struct drm_device *dev,
3602 struct drm_atomic_state *state)
3603{
3604 struct drm_modeset_acquire_ctx ctx;
3605 int err;
3606
3607 drm_mode_config_reset(dev);
3608
3609 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, err);
3610
3611 err = drm_atomic_helper_commit_duplicated_state(state, &ctx);
3612
3613 DRM_MODESET_LOCK_ALL_END(dev, ctx, err);
3614 drm_atomic_state_put(state);
3615
3616 return err;
3617}
3618EXPORT_SYMBOL(drm_atomic_helper_resume);
3619
3620static int page_flip_common(struct drm_atomic_state *state,
3621 struct drm_crtc *crtc,
3622 struct drm_framebuffer *fb,
3623 struct drm_pending_vblank_event *event,
3624 uint32_t flags)
3625{
3626 struct drm_plane *plane = crtc->primary;
3627 struct drm_plane_state *plane_state;
3628 struct drm_crtc_state *crtc_state;
3629 int ret = 0;
3630
3631 crtc_state = drm_atomic_get_crtc_state(state, crtc);
3632 if (IS_ERR(crtc_state))
3633 return PTR_ERR(crtc_state);
3634
3635 crtc_state->event = event;
3636 crtc_state->async_flip = flags & DRM_MODE_PAGE_FLIP_ASYNC;
3637
3638 plane_state = drm_atomic_get_plane_state(state, plane);
3639 if (IS_ERR(plane_state))
3640 return PTR_ERR(plane_state);
3641
3642 ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
3643 if (ret != 0)
3644 return ret;
3645 drm_atomic_set_fb_for_plane(plane_state, fb);
3646
3647 /* Make sure we don't accidentally do a full modeset. */
3648 state->allow_modeset = false;
3649 if (!crtc_state->active) {
3650 drm_dbg_atomic(crtc->dev,
3651 "[CRTC:%d:%s] disabled, rejecting legacy flip\n",
3652 crtc->base.id, crtc->name);
3653 return -EINVAL;
3654 }
3655
3656 return ret;
3657}
3658
3659/**
3660 * drm_atomic_helper_page_flip - execute a legacy page flip
3661 * @crtc: DRM CRTC
3662 * @fb: DRM framebuffer
3663 * @event: optional DRM event to signal upon completion
3664 * @flags: flip flags for non-vblank sync'ed updates
3665 * @ctx: lock acquisition context
3666 *
3667 * Provides a default &drm_crtc_funcs.page_flip implementation
3668 * using the atomic driver interface.
3669 *
3670 * Returns:
3671 * Returns 0 on success, negative errno numbers on failure.
3672 *
3673 * See also:
3674 * drm_atomic_helper_page_flip_target()
3675 */
3676int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
3677 struct drm_framebuffer *fb,
3678 struct drm_pending_vblank_event *event,
3679 uint32_t flags,
3680 struct drm_modeset_acquire_ctx *ctx)
3681{
3682 struct drm_plane *plane = crtc->primary;
3683 struct drm_atomic_state *state;
3684 int ret = 0;
3685
3686 state = drm_atomic_state_alloc(plane->dev);
3687 if (!state)
3688 return -ENOMEM;
3689
3690 state->acquire_ctx = ctx;
3691
3692 ret = page_flip_common(state, crtc, fb, event, flags);
3693 if (ret != 0)
3694 goto fail;
3695
3696 ret = drm_atomic_nonblocking_commit(state);
3697fail:
3698 drm_atomic_state_put(state);
3699 return ret;
3700}
3701EXPORT_SYMBOL(drm_atomic_helper_page_flip);
3702
3703/**
3704 * drm_atomic_helper_page_flip_target - do page flip on target vblank period.
3705 * @crtc: DRM CRTC
3706 * @fb: DRM framebuffer
3707 * @event: optional DRM event to signal upon completion
3708 * @flags: flip flags for non-vblank sync'ed updates
3709 * @target: specifying the target vblank period when the flip to take effect
3710 * @ctx: lock acquisition context
3711 *
3712 * Provides a default &drm_crtc_funcs.page_flip_target implementation.
3713 * Similar to drm_atomic_helper_page_flip() with extra parameter to specify
3714 * target vblank period to flip.
3715 *
3716 * Returns:
3717 * Returns 0 on success, negative errno numbers on failure.
3718 */
3719int drm_atomic_helper_page_flip_target(struct drm_crtc *crtc,
3720 struct drm_framebuffer *fb,
3721 struct drm_pending_vblank_event *event,
3722 uint32_t flags,
3723 uint32_t target,
3724 struct drm_modeset_acquire_ctx *ctx)
3725{
3726 struct drm_plane *plane = crtc->primary;
3727 struct drm_atomic_state *state;
3728 struct drm_crtc_state *crtc_state;
3729 int ret = 0;
3730
3731 state = drm_atomic_state_alloc(plane->dev);
3732 if (!state)
3733 return -ENOMEM;
3734
3735 state->acquire_ctx = ctx;
3736
3737 ret = page_flip_common(state, crtc, fb, event, flags);
3738 if (ret != 0)
3739 goto fail;
3740
3741 crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
3742 if (WARN_ON(!crtc_state)) {
3743 ret = -EINVAL;
3744 goto fail;
3745 }
3746 crtc_state->target_vblank = target;
3747
3748 ret = drm_atomic_nonblocking_commit(state);
3749fail:
3750 drm_atomic_state_put(state);
3751 return ret;
3752}
3753EXPORT_SYMBOL(drm_atomic_helper_page_flip_target);
3754
3755/**
3756 * drm_atomic_helper_bridge_propagate_bus_fmt() - Propagate output format to
3757 * the input end of a bridge
3758 * @bridge: bridge control structure
3759 * @bridge_state: new bridge state
3760 * @crtc_state: new CRTC state
3761 * @conn_state: new connector state
3762 * @output_fmt: tested output bus format
3763 * @num_input_fmts: will contain the size of the returned array
3764 *
3765 * This helper is a pluggable implementation of the
3766 * &drm_bridge_funcs.atomic_get_input_bus_fmts operation for bridges that don't
3767 * modify the bus configuration between their input and their output. It
3768 * returns an array of input formats with a single element set to @output_fmt.
3769 *
3770 * RETURNS:
3771 * a valid format array of size @num_input_fmts, or NULL if the allocation
3772 * failed
3773 */
3774u32 *
3775drm_atomic_helper_bridge_propagate_bus_fmt(struct drm_bridge *bridge,
3776 struct drm_bridge_state *bridge_state,
3777 struct drm_crtc_state *crtc_state,
3778 struct drm_connector_state *conn_state,
3779 u32 output_fmt,
3780 unsigned int *num_input_fmts)
3781{
3782 u32 *input_fmts;
3783
3784 input_fmts = kzalloc(sizeof(*input_fmts), GFP_KERNEL);
3785 if (!input_fmts) {
3786 *num_input_fmts = 0;
3787 return NULL;
3788 }
3789
3790 *num_input_fmts = 1;
3791 input_fmts[0] = output_fmt;
3792 return input_fmts;
3793}
3794EXPORT_SYMBOL(drm_atomic_helper_bridge_propagate_bus_fmt);
1/*
2 * Copyright (C) 2014 Red Hat
3 * Copyright (C) 2014 Intel Corp.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Rob Clark <robdclark@gmail.com>
25 * Daniel Vetter <daniel.vetter@ffwll.ch>
26 */
27
28#include <linux/dma-fence.h>
29#include <linux/ktime.h>
30
31#include <drm/drm_atomic.h>
32#include <drm/drm_atomic_helper.h>
33#include <drm/drm_atomic_uapi.h>
34#include <drm/drm_bridge.h>
35#include <drm/drm_damage_helper.h>
36#include <drm/drm_device.h>
37#include <drm/drm_drv.h>
38#include <drm/drm_plane_helper.h>
39#include <drm/drm_print.h>
40#include <drm/drm_self_refresh_helper.h>
41#include <drm/drm_vblank.h>
42#include <drm/drm_writeback.h>
43
44#include "drm_crtc_helper_internal.h"
45#include "drm_crtc_internal.h"
46
47/**
48 * DOC: overview
49 *
50 * This helper library provides implementations of check and commit functions on
51 * top of the CRTC modeset helper callbacks and the plane helper callbacks. It
52 * also provides convenience implementations for the atomic state handling
53 * callbacks for drivers which don't need to subclass the drm core structures to
54 * add their own additional internal state.
55 *
56 * This library also provides default implementations for the check callback in
57 * drm_atomic_helper_check() and for the commit callback with
58 * drm_atomic_helper_commit(). But the individual stages and callbacks are
59 * exposed to allow drivers to mix and match and e.g. use the plane helpers only
60 * together with a driver private modeset implementation.
61 *
62 * This library also provides implementations for all the legacy driver
63 * interfaces on top of the atomic interface. See drm_atomic_helper_set_config(),
64 * drm_atomic_helper_disable_plane(), and the various functions to implement
65 * set_property callbacks. New drivers must not implement these functions
66 * themselves but must use the provided helpers.
67 *
68 * The atomic helper uses the same function table structures as all other
69 * modesetting helpers. See the documentation for &struct drm_crtc_helper_funcs,
70 * struct &drm_encoder_helper_funcs and &struct drm_connector_helper_funcs. It
71 * also shares the &struct drm_plane_helper_funcs function table with the plane
72 * helpers.
73 */
74static void
75drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
76 struct drm_plane_state *old_plane_state,
77 struct drm_plane_state *plane_state,
78 struct drm_plane *plane)
79{
80 struct drm_crtc_state *crtc_state;
81
82 if (old_plane_state->crtc) {
83 crtc_state = drm_atomic_get_new_crtc_state(state,
84 old_plane_state->crtc);
85
86 if (WARN_ON(!crtc_state))
87 return;
88
89 crtc_state->planes_changed = true;
90 }
91
92 if (plane_state->crtc) {
93 crtc_state = drm_atomic_get_new_crtc_state(state, plane_state->crtc);
94
95 if (WARN_ON(!crtc_state))
96 return;
97
98 crtc_state->planes_changed = true;
99 }
100}
101
102static int handle_conflicting_encoders(struct drm_atomic_state *state,
103 bool disable_conflicting_encoders)
104{
105 struct drm_connector_state *new_conn_state;
106 struct drm_connector *connector;
107 struct drm_connector_list_iter conn_iter;
108 struct drm_encoder *encoder;
109 unsigned int encoder_mask = 0;
110 int i, ret = 0;
111
112 /*
113 * First loop, find all newly assigned encoders from the connectors
114 * part of the state. If the same encoder is assigned to multiple
115 * connectors bail out.
116 */
117 for_each_new_connector_in_state(state, connector, new_conn_state, i) {
118 const struct drm_connector_helper_funcs *funcs = connector->helper_private;
119 struct drm_encoder *new_encoder;
120
121 if (!new_conn_state->crtc)
122 continue;
123
124 if (funcs->atomic_best_encoder)
125 new_encoder = funcs->atomic_best_encoder(connector,
126 state);
127 else if (funcs->best_encoder)
128 new_encoder = funcs->best_encoder(connector);
129 else
130 new_encoder = drm_connector_get_single_encoder(connector);
131
132 if (new_encoder) {
133 if (encoder_mask & drm_encoder_mask(new_encoder)) {
134 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] on [CONNECTOR:%d:%s] already assigned\n",
135 new_encoder->base.id, new_encoder->name,
136 connector->base.id, connector->name);
137
138 return -EINVAL;
139 }
140
141 encoder_mask |= drm_encoder_mask(new_encoder);
142 }
143 }
144
145 if (!encoder_mask)
146 return 0;
147
148 /*
149 * Second loop, iterate over all connectors not part of the state.
150 *
151 * If a conflicting encoder is found and disable_conflicting_encoders
152 * is not set, an error is returned. Userspace can provide a solution
153 * through the atomic ioctl.
154 *
155 * If the flag is set conflicting connectors are removed from the CRTC
156 * and the CRTC is disabled if no encoder is left. This preserves
157 * compatibility with the legacy set_config behavior.
158 */
159 drm_connector_list_iter_begin(state->dev, &conn_iter);
160 drm_for_each_connector_iter(connector, &conn_iter) {
161 struct drm_crtc_state *crtc_state;
162
163 if (drm_atomic_get_new_connector_state(state, connector))
164 continue;
165
166 encoder = connector->state->best_encoder;
167 if (!encoder || !(encoder_mask & drm_encoder_mask(encoder)))
168 continue;
169
170 if (!disable_conflicting_encoders) {
171 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s] by [CONNECTOR:%d:%s]\n",
172 encoder->base.id, encoder->name,
173 connector->state->crtc->base.id,
174 connector->state->crtc->name,
175 connector->base.id, connector->name);
176 ret = -EINVAL;
177 goto out;
178 }
179
180 new_conn_state = drm_atomic_get_connector_state(state, connector);
181 if (IS_ERR(new_conn_state)) {
182 ret = PTR_ERR(new_conn_state);
183 goto out;
184 }
185
186 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s], disabling [CONNECTOR:%d:%s]\n",
187 encoder->base.id, encoder->name,
188 new_conn_state->crtc->base.id, new_conn_state->crtc->name,
189 connector->base.id, connector->name);
190
191 crtc_state = drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);
192
193 ret = drm_atomic_set_crtc_for_connector(new_conn_state, NULL);
194 if (ret)
195 goto out;
196
197 if (!crtc_state->connector_mask) {
198 ret = drm_atomic_set_mode_prop_for_crtc(crtc_state,
199 NULL);
200 if (ret < 0)
201 goto out;
202
203 crtc_state->active = false;
204 }
205 }
206out:
207 drm_connector_list_iter_end(&conn_iter);
208
209 return ret;
210}
211
212static void
213set_best_encoder(struct drm_atomic_state *state,
214 struct drm_connector_state *conn_state,
215 struct drm_encoder *encoder)
216{
217 struct drm_crtc_state *crtc_state;
218 struct drm_crtc *crtc;
219
220 if (conn_state->best_encoder) {
221 /* Unset the encoder_mask in the old crtc state. */
222 crtc = conn_state->connector->state->crtc;
223
224 /* A NULL crtc is an error here because we should have
225 * duplicated a NULL best_encoder when crtc was NULL.
226 * As an exception restoring duplicated atomic state
227 * during resume is allowed, so don't warn when
228 * best_encoder is equal to encoder we intend to set.
229 */
230 WARN_ON(!crtc && encoder != conn_state->best_encoder);
231 if (crtc) {
232 crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
233
234 crtc_state->encoder_mask &=
235 ~drm_encoder_mask(conn_state->best_encoder);
236 }
237 }
238
239 if (encoder) {
240 crtc = conn_state->crtc;
241 WARN_ON(!crtc);
242 if (crtc) {
243 crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
244
245 crtc_state->encoder_mask |=
246 drm_encoder_mask(encoder);
247 }
248 }
249
250 conn_state->best_encoder = encoder;
251}
252
253static void
254steal_encoder(struct drm_atomic_state *state,
255 struct drm_encoder *encoder)
256{
257 struct drm_crtc_state *crtc_state;
258 struct drm_connector *connector;
259 struct drm_connector_state *old_connector_state, *new_connector_state;
260 int i;
261
262 for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
263 struct drm_crtc *encoder_crtc;
264
265 if (new_connector_state->best_encoder != encoder)
266 continue;
267
268 encoder_crtc = old_connector_state->crtc;
269
270 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s], stealing it\n",
271 encoder->base.id, encoder->name,
272 encoder_crtc->base.id, encoder_crtc->name);
273
274 set_best_encoder(state, new_connector_state, NULL);
275
276 crtc_state = drm_atomic_get_new_crtc_state(state, encoder_crtc);
277 crtc_state->connectors_changed = true;
278
279 return;
280 }
281}
282
283static int
284update_connector_routing(struct drm_atomic_state *state,
285 struct drm_connector *connector,
286 struct drm_connector_state *old_connector_state,
287 struct drm_connector_state *new_connector_state)
288{
289 const struct drm_connector_helper_funcs *funcs;
290 struct drm_encoder *new_encoder;
291 struct drm_crtc_state *crtc_state;
292
293 DRM_DEBUG_ATOMIC("Updating routing for [CONNECTOR:%d:%s]\n",
294 connector->base.id,
295 connector->name);
296
297 if (old_connector_state->crtc != new_connector_state->crtc) {
298 if (old_connector_state->crtc) {
299 crtc_state = drm_atomic_get_new_crtc_state(state, old_connector_state->crtc);
300 crtc_state->connectors_changed = true;
301 }
302
303 if (new_connector_state->crtc) {
304 crtc_state = drm_atomic_get_new_crtc_state(state, new_connector_state->crtc);
305 crtc_state->connectors_changed = true;
306 }
307 }
308
309 if (!new_connector_state->crtc) {
310 DRM_DEBUG_ATOMIC("Disabling [CONNECTOR:%d:%s]\n",
311 connector->base.id,
312 connector->name);
313
314 set_best_encoder(state, new_connector_state, NULL);
315
316 return 0;
317 }
318
319 crtc_state = drm_atomic_get_new_crtc_state(state,
320 new_connector_state->crtc);
321 /*
322 * For compatibility with legacy users, we want to make sure that
323 * we allow DPMS On->Off modesets on unregistered connectors. Modesets
324 * which would result in anything else must be considered invalid, to
325 * avoid turning on new displays on dead connectors.
326 *
327 * Since the connector can be unregistered at any point during an
328 * atomic check or commit, this is racy. But that's OK: all we care
329 * about is ensuring that userspace can't do anything but shut off the
330 * display on a connector that was destroyed after it's been notified,
331 * not before.
332 *
333 * Additionally, we also want to ignore connector registration when
334 * we're trying to restore an atomic state during system resume since
335 * there's a chance the connector may have been destroyed during the
336 * process, but it's better to ignore that then cause
337 * drm_atomic_helper_resume() to fail.
338 */
339 if (!state->duplicated && drm_connector_is_unregistered(connector) &&
340 crtc_state->active) {
341 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] is not registered\n",
342 connector->base.id, connector->name);
343 return -EINVAL;
344 }
345
346 funcs = connector->helper_private;
347
348 if (funcs->atomic_best_encoder)
349 new_encoder = funcs->atomic_best_encoder(connector, state);
350 else if (funcs->best_encoder)
351 new_encoder = funcs->best_encoder(connector);
352 else
353 new_encoder = drm_connector_get_single_encoder(connector);
354
355 if (!new_encoder) {
356 DRM_DEBUG_ATOMIC("No suitable encoder found for [CONNECTOR:%d:%s]\n",
357 connector->base.id,
358 connector->name);
359 return -EINVAL;
360 }
361
362 if (!drm_encoder_crtc_ok(new_encoder, new_connector_state->crtc)) {
363 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] incompatible with [CRTC:%d:%s]\n",
364 new_encoder->base.id,
365 new_encoder->name,
366 new_connector_state->crtc->base.id,
367 new_connector_state->crtc->name);
368 return -EINVAL;
369 }
370
371 if (new_encoder == new_connector_state->best_encoder) {
372 set_best_encoder(state, new_connector_state, new_encoder);
373
374 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d:%s]\n",
375 connector->base.id,
376 connector->name,
377 new_encoder->base.id,
378 new_encoder->name,
379 new_connector_state->crtc->base.id,
380 new_connector_state->crtc->name);
381
382 return 0;
383 }
384
385 steal_encoder(state, new_encoder);
386
387 set_best_encoder(state, new_connector_state, new_encoder);
388
389 crtc_state->connectors_changed = true;
390
391 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d:%s]\n",
392 connector->base.id,
393 connector->name,
394 new_encoder->base.id,
395 new_encoder->name,
396 new_connector_state->crtc->base.id,
397 new_connector_state->crtc->name);
398
399 return 0;
400}
401
402static int
403mode_fixup(struct drm_atomic_state *state)
404{
405 struct drm_crtc *crtc;
406 struct drm_crtc_state *new_crtc_state;
407 struct drm_connector *connector;
408 struct drm_connector_state *new_conn_state;
409 int i;
410 int ret;
411
412 for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
413 if (!new_crtc_state->mode_changed &&
414 !new_crtc_state->connectors_changed)
415 continue;
416
417 drm_mode_copy(&new_crtc_state->adjusted_mode, &new_crtc_state->mode);
418 }
419
420 for_each_new_connector_in_state(state, connector, new_conn_state, i) {
421 const struct drm_encoder_helper_funcs *funcs;
422 struct drm_encoder *encoder;
423 struct drm_bridge *bridge;
424
425 WARN_ON(!!new_conn_state->best_encoder != !!new_conn_state->crtc);
426
427 if (!new_conn_state->crtc || !new_conn_state->best_encoder)
428 continue;
429
430 new_crtc_state =
431 drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);
432
433 /*
434 * Each encoder has at most one connector (since we always steal
435 * it away), so we won't call ->mode_fixup twice.
436 */
437 encoder = new_conn_state->best_encoder;
438 funcs = encoder->helper_private;
439
440 bridge = drm_bridge_chain_get_first_bridge(encoder);
441 ret = drm_atomic_bridge_chain_check(bridge,
442 new_crtc_state,
443 new_conn_state);
444 if (ret) {
445 DRM_DEBUG_ATOMIC("Bridge atomic check failed\n");
446 return ret;
447 }
448
449 if (funcs && funcs->atomic_check) {
450 ret = funcs->atomic_check(encoder, new_crtc_state,
451 new_conn_state);
452 if (ret) {
453 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] check failed\n",
454 encoder->base.id, encoder->name);
455 return ret;
456 }
457 } else if (funcs && funcs->mode_fixup) {
458 ret = funcs->mode_fixup(encoder, &new_crtc_state->mode,
459 &new_crtc_state->adjusted_mode);
460 if (!ret) {
461 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] fixup failed\n",
462 encoder->base.id, encoder->name);
463 return -EINVAL;
464 }
465 }
466 }
467
468 for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
469 const struct drm_crtc_helper_funcs *funcs;
470
471 if (!new_crtc_state->enable)
472 continue;
473
474 if (!new_crtc_state->mode_changed &&
475 !new_crtc_state->connectors_changed)
476 continue;
477
478 funcs = crtc->helper_private;
479 if (!funcs || !funcs->mode_fixup)
480 continue;
481
482 ret = funcs->mode_fixup(crtc, &new_crtc_state->mode,
483 &new_crtc_state->adjusted_mode);
484 if (!ret) {
485 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] fixup failed\n",
486 crtc->base.id, crtc->name);
487 return -EINVAL;
488 }
489 }
490
491 return 0;
492}
493
494static enum drm_mode_status mode_valid_path(struct drm_connector *connector,
495 struct drm_encoder *encoder,
496 struct drm_crtc *crtc,
497 const struct drm_display_mode *mode)
498{
499 struct drm_bridge *bridge;
500 enum drm_mode_status ret;
501
502 ret = drm_encoder_mode_valid(encoder, mode);
503 if (ret != MODE_OK) {
504 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] mode_valid() failed\n",
505 encoder->base.id, encoder->name);
506 return ret;
507 }
508
509 bridge = drm_bridge_chain_get_first_bridge(encoder);
510 ret = drm_bridge_chain_mode_valid(bridge, &connector->display_info,
511 mode);
512 if (ret != MODE_OK) {
513 DRM_DEBUG_ATOMIC("[BRIDGE] mode_valid() failed\n");
514 return ret;
515 }
516
517 ret = drm_crtc_mode_valid(crtc, mode);
518 if (ret != MODE_OK) {
519 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] mode_valid() failed\n",
520 crtc->base.id, crtc->name);
521 return ret;
522 }
523
524 return ret;
525}
526
527static int
528mode_valid(struct drm_atomic_state *state)
529{
530 struct drm_connector_state *conn_state;
531 struct drm_connector *connector;
532 int i;
533
534 for_each_new_connector_in_state(state, connector, conn_state, i) {
535 struct drm_encoder *encoder = conn_state->best_encoder;
536 struct drm_crtc *crtc = conn_state->crtc;
537 struct drm_crtc_state *crtc_state;
538 enum drm_mode_status mode_status;
539 const struct drm_display_mode *mode;
540
541 if (!crtc || !encoder)
542 continue;
543
544 crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
545 if (!crtc_state)
546 continue;
547 if (!crtc_state->mode_changed && !crtc_state->connectors_changed)
548 continue;
549
550 mode = &crtc_state->mode;
551
552 mode_status = mode_valid_path(connector, encoder, crtc, mode);
553 if (mode_status != MODE_OK)
554 return -EINVAL;
555 }
556
557 return 0;
558}
559
560/**
561 * drm_atomic_helper_check_modeset - validate state object for modeset changes
562 * @dev: DRM device
563 * @state: the driver state object
564 *
565 * Check the state object to see if the requested state is physically possible.
566 * This does all the CRTC and connector related computations for an atomic
567 * update and adds any additional connectors needed for full modesets. It calls
568 * the various per-object callbacks in the follow order:
569 *
570 * 1. &drm_connector_helper_funcs.atomic_best_encoder for determining the new encoder.
571 * 2. &drm_connector_helper_funcs.atomic_check to validate the connector state.
572 * 3. If it's determined a modeset is needed then all connectors on the affected
573 * CRTC are added and &drm_connector_helper_funcs.atomic_check is run on them.
574 * 4. &drm_encoder_helper_funcs.mode_valid, &drm_bridge_funcs.mode_valid and
575 * &drm_crtc_helper_funcs.mode_valid are called on the affected components.
576 * 5. &drm_bridge_funcs.mode_fixup is called on all encoder bridges.
577 * 6. &drm_encoder_helper_funcs.atomic_check is called to validate any encoder state.
578 * This function is only called when the encoder will be part of a configured CRTC,
579 * it must not be used for implementing connector property validation.
580 * If this function is NULL, &drm_atomic_encoder_helper_funcs.mode_fixup is called
581 * instead.
582 * 7. &drm_crtc_helper_funcs.mode_fixup is called last, to fix up the mode with CRTC constraints.
583 *
584 * &drm_crtc_state.mode_changed is set when the input mode is changed.
585 * &drm_crtc_state.connectors_changed is set when a connector is added or
586 * removed from the CRTC. &drm_crtc_state.active_changed is set when
587 * &drm_crtc_state.active changes, which is used for DPMS.
588 * &drm_crtc_state.no_vblank is set from the result of drm_dev_has_vblank().
589 * See also: drm_atomic_crtc_needs_modeset()
590 *
591 * IMPORTANT:
592 *
593 * Drivers which set &drm_crtc_state.mode_changed (e.g. in their
594 * &drm_plane_helper_funcs.atomic_check hooks if a plane update can't be done
595 * without a full modeset) _must_ call this function after that change. It is
596 * permitted to call this function multiple times for the same update, e.g.
597 * when the &drm_crtc_helper_funcs.atomic_check functions depend upon the
598 * adjusted dotclock for fifo space allocation and watermark computation.
599 *
600 * RETURNS:
601 * Zero for success or -errno
602 */
603int
604drm_atomic_helper_check_modeset(struct drm_device *dev,
605 struct drm_atomic_state *state)
606{
607 struct drm_crtc *crtc;
608 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
609 struct drm_connector *connector;
610 struct drm_connector_state *old_connector_state, *new_connector_state;
611 int i, ret;
612 unsigned int connectors_mask = 0;
613
614 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
615 bool has_connectors =
616 !!new_crtc_state->connector_mask;
617
618 WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
619
620 if (!drm_mode_equal(&old_crtc_state->mode, &new_crtc_state->mode)) {
621 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] mode changed\n",
622 crtc->base.id, crtc->name);
623 new_crtc_state->mode_changed = true;
624 }
625
626 if (old_crtc_state->enable != new_crtc_state->enable) {
627 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enable changed\n",
628 crtc->base.id, crtc->name);
629
630 /*
631 * For clarity this assignment is done here, but
632 * enable == 0 is only true when there are no
633 * connectors and a NULL mode.
634 *
635 * The other way around is true as well. enable != 0
636 * iff connectors are attached and a mode is set.
637 */
638 new_crtc_state->mode_changed = true;
639 new_crtc_state->connectors_changed = true;
640 }
641
642 if (old_crtc_state->active != new_crtc_state->active) {
643 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] active changed\n",
644 crtc->base.id, crtc->name);
645 new_crtc_state->active_changed = true;
646 }
647
648 if (new_crtc_state->enable != has_connectors) {
649 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enabled/connectors mismatch\n",
650 crtc->base.id, crtc->name);
651
652 return -EINVAL;
653 }
654
655 if (drm_dev_has_vblank(dev))
656 new_crtc_state->no_vblank = false;
657 else
658 new_crtc_state->no_vblank = true;
659 }
660
661 ret = handle_conflicting_encoders(state, false);
662 if (ret)
663 return ret;
664
665 for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
666 const struct drm_connector_helper_funcs *funcs = connector->helper_private;
667
668 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
669
670 /*
671 * This only sets crtc->connectors_changed for routing changes,
672 * drivers must set crtc->connectors_changed themselves when
673 * connector properties need to be updated.
674 */
675 ret = update_connector_routing(state, connector,
676 old_connector_state,
677 new_connector_state);
678 if (ret)
679 return ret;
680 if (old_connector_state->crtc) {
681 new_crtc_state = drm_atomic_get_new_crtc_state(state,
682 old_connector_state->crtc);
683 if (old_connector_state->link_status !=
684 new_connector_state->link_status)
685 new_crtc_state->connectors_changed = true;
686
687 if (old_connector_state->max_requested_bpc !=
688 new_connector_state->max_requested_bpc)
689 new_crtc_state->connectors_changed = true;
690 }
691
692 if (funcs->atomic_check)
693 ret = funcs->atomic_check(connector, state);
694 if (ret)
695 return ret;
696
697 connectors_mask |= BIT(i);
698 }
699
700 /*
701 * After all the routing has been prepared we need to add in any
702 * connector which is itself unchanged, but whose CRTC changes its
703 * configuration. This must be done before calling mode_fixup in case a
704 * crtc only changed its mode but has the same set of connectors.
705 */
706 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
707 if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
708 continue;
709
710 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] needs all connectors, enable: %c, active: %c\n",
711 crtc->base.id, crtc->name,
712 new_crtc_state->enable ? 'y' : 'n',
713 new_crtc_state->active ? 'y' : 'n');
714
715 ret = drm_atomic_add_affected_connectors(state, crtc);
716 if (ret != 0)
717 return ret;
718
719 ret = drm_atomic_add_affected_planes(state, crtc);
720 if (ret != 0)
721 return ret;
722 }
723
724 /*
725 * Iterate over all connectors again, to make sure atomic_check()
726 * has been called on them when a modeset is forced.
727 */
728 for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
729 const struct drm_connector_helper_funcs *funcs = connector->helper_private;
730
731 if (connectors_mask & BIT(i))
732 continue;
733
734 if (funcs->atomic_check)
735 ret = funcs->atomic_check(connector, state);
736 if (ret)
737 return ret;
738 }
739
740 /*
741 * Iterate over all connectors again, and add all affected bridges to
742 * the state.
743 */
744 for_each_oldnew_connector_in_state(state, connector,
745 old_connector_state,
746 new_connector_state, i) {
747 struct drm_encoder *encoder;
748
749 encoder = old_connector_state->best_encoder;
750 ret = drm_atomic_add_encoder_bridges(state, encoder);
751 if (ret)
752 return ret;
753
754 encoder = new_connector_state->best_encoder;
755 ret = drm_atomic_add_encoder_bridges(state, encoder);
756 if (ret)
757 return ret;
758 }
759
760 ret = mode_valid(state);
761 if (ret)
762 return ret;
763
764 return mode_fixup(state);
765}
766EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
767
768/**
769 * drm_atomic_helper_check_plane_state() - Check plane state for validity
770 * @plane_state: plane state to check
771 * @crtc_state: CRTC state to check
772 * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
773 * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
774 * @can_position: is it legal to position the plane such that it
775 * doesn't cover the entire CRTC? This will generally
776 * only be false for primary planes.
777 * @can_update_disabled: can the plane be updated while the CRTC
778 * is disabled?
779 *
780 * Checks that a desired plane update is valid, and updates various
781 * bits of derived state (clipped coordinates etc.). Drivers that provide
782 * their own plane handling rather than helper-provided implementations may
783 * still wish to call this function to avoid duplication of error checking
784 * code.
785 *
786 * RETURNS:
787 * Zero if update appears valid, error code on failure
788 */
789int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
790 const struct drm_crtc_state *crtc_state,
791 int min_scale,
792 int max_scale,
793 bool can_position,
794 bool can_update_disabled)
795{
796 struct drm_framebuffer *fb = plane_state->fb;
797 struct drm_rect *src = &plane_state->src;
798 struct drm_rect *dst = &plane_state->dst;
799 unsigned int rotation = plane_state->rotation;
800 struct drm_rect clip = {};
801 int hscale, vscale;
802
803 WARN_ON(plane_state->crtc && plane_state->crtc != crtc_state->crtc);
804
805 *src = drm_plane_state_src(plane_state);
806 *dst = drm_plane_state_dest(plane_state);
807
808 if (!fb) {
809 plane_state->visible = false;
810 return 0;
811 }
812
813 /* crtc should only be NULL when disabling (i.e., !fb) */
814 if (WARN_ON(!plane_state->crtc)) {
815 plane_state->visible = false;
816 return 0;
817 }
818
819 if (!crtc_state->enable && !can_update_disabled) {
820 DRM_DEBUG_KMS("Cannot update plane of a disabled CRTC.\n");
821 return -EINVAL;
822 }
823
824 drm_rect_rotate(src, fb->width << 16, fb->height << 16, rotation);
825
826 /* Check scaling */
827 hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
828 vscale = drm_rect_calc_vscale(src, dst, min_scale, max_scale);
829 if (hscale < 0 || vscale < 0) {
830 DRM_DEBUG_KMS("Invalid scaling of plane\n");
831 drm_rect_debug_print("src: ", &plane_state->src, true);
832 drm_rect_debug_print("dst: ", &plane_state->dst, false);
833 return -ERANGE;
834 }
835
836 if (crtc_state->enable)
837 drm_mode_get_hv_timing(&crtc_state->mode, &clip.x2, &clip.y2);
838
839 plane_state->visible = drm_rect_clip_scaled(src, dst, &clip);
840
841 drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16, rotation);
842
843 if (!plane_state->visible)
844 /*
845 * Plane isn't visible; some drivers can handle this
846 * so we just return success here. Drivers that can't
847 * (including those that use the primary plane helper's
848 * update function) will return an error from their
849 * update_plane handler.
850 */
851 return 0;
852
853 if (!can_position && !drm_rect_equals(dst, &clip)) {
854 DRM_DEBUG_KMS("Plane must cover entire CRTC\n");
855 drm_rect_debug_print("dst: ", dst, false);
856 drm_rect_debug_print("clip: ", &clip, false);
857 return -EINVAL;
858 }
859
860 return 0;
861}
862EXPORT_SYMBOL(drm_atomic_helper_check_plane_state);
863
864/**
865 * drm_atomic_helper_check_planes - validate state object for planes changes
866 * @dev: DRM device
867 * @state: the driver state object
868 *
869 * Check the state object to see if the requested state is physically possible.
870 * This does all the plane update related checks using by calling into the
871 * &drm_crtc_helper_funcs.atomic_check and &drm_plane_helper_funcs.atomic_check
872 * hooks provided by the driver.
873 *
874 * It also sets &drm_crtc_state.planes_changed to indicate that a CRTC has
875 * updated planes.
876 *
877 * RETURNS:
878 * Zero for success or -errno
879 */
880int
881drm_atomic_helper_check_planes(struct drm_device *dev,
882 struct drm_atomic_state *state)
883{
884 struct drm_crtc *crtc;
885 struct drm_crtc_state *new_crtc_state;
886 struct drm_plane *plane;
887 struct drm_plane_state *new_plane_state, *old_plane_state;
888 int i, ret = 0;
889
890 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
891 const struct drm_plane_helper_funcs *funcs;
892
893 WARN_ON(!drm_modeset_is_locked(&plane->mutex));
894
895 funcs = plane->helper_private;
896
897 drm_atomic_helper_plane_changed(state, old_plane_state, new_plane_state, plane);
898
899 drm_atomic_helper_check_plane_damage(state, new_plane_state);
900
901 if (!funcs || !funcs->atomic_check)
902 continue;
903
904 ret = funcs->atomic_check(plane, state);
905 if (ret) {
906 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] atomic driver check failed\n",
907 plane->base.id, plane->name);
908 return ret;
909 }
910 }
911
912 for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
913 const struct drm_crtc_helper_funcs *funcs;
914
915 funcs = crtc->helper_private;
916
917 if (!funcs || !funcs->atomic_check)
918 continue;
919
920 ret = funcs->atomic_check(crtc, state);
921 if (ret) {
922 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] atomic driver check failed\n",
923 crtc->base.id, crtc->name);
924 return ret;
925 }
926 }
927
928 return ret;
929}
930EXPORT_SYMBOL(drm_atomic_helper_check_planes);
931
932/**
933 * drm_atomic_helper_check - validate state object
934 * @dev: DRM device
935 * @state: the driver state object
936 *
937 * Check the state object to see if the requested state is physically possible.
938 * Only CRTCs and planes have check callbacks, so for any additional (global)
939 * checking that a driver needs it can simply wrap that around this function.
940 * Drivers without such needs can directly use this as their
941 * &drm_mode_config_funcs.atomic_check callback.
942 *
943 * This just wraps the two parts of the state checking for planes and modeset
944 * state in the default order: First it calls drm_atomic_helper_check_modeset()
945 * and then drm_atomic_helper_check_planes(). The assumption is that the
946 * @drm_plane_helper_funcs.atomic_check and @drm_crtc_helper_funcs.atomic_check
947 * functions depend upon an updated adjusted_mode.clock to e.g. properly compute
948 * watermarks.
949 *
950 * Note that zpos normalization will add all enable planes to the state which
951 * might not desired for some drivers.
952 * For example enable/disable of a cursor plane which have fixed zpos value
953 * would trigger all other enabled planes to be forced to the state change.
954 *
955 * RETURNS:
956 * Zero for success or -errno
957 */
958int drm_atomic_helper_check(struct drm_device *dev,
959 struct drm_atomic_state *state)
960{
961 int ret;
962
963 ret = drm_atomic_helper_check_modeset(dev, state);
964 if (ret)
965 return ret;
966
967 if (dev->mode_config.normalize_zpos) {
968 ret = drm_atomic_normalize_zpos(dev, state);
969 if (ret)
970 return ret;
971 }
972
973 ret = drm_atomic_helper_check_planes(dev, state);
974 if (ret)
975 return ret;
976
977 if (state->legacy_cursor_update)
978 state->async_update = !drm_atomic_helper_async_check(dev, state);
979
980 drm_self_refresh_helper_alter_state(state);
981
982 return ret;
983}
984EXPORT_SYMBOL(drm_atomic_helper_check);
985
986static bool
987crtc_needs_disable(struct drm_crtc_state *old_state,
988 struct drm_crtc_state *new_state)
989{
990 /*
991 * No new_state means the CRTC is off, so the only criteria is whether
992 * it's currently active or in self refresh mode.
993 */
994 if (!new_state)
995 return drm_atomic_crtc_effectively_active(old_state);
996
997 /*
998 * We need to run through the crtc_funcs->disable() function if the CRTC
999 * is currently on, if it's transitioning to self refresh mode, or if
1000 * it's in self refresh mode and needs to be fully disabled.
1001 */
1002 return old_state->active ||
1003 (old_state->self_refresh_active && !new_state->enable) ||
1004 new_state->self_refresh_active;
1005}
1006
1007static void
1008disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
1009{
1010 struct drm_connector *connector;
1011 struct drm_connector_state *old_conn_state, *new_conn_state;
1012 struct drm_crtc *crtc;
1013 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
1014 int i;
1015
1016 for_each_oldnew_connector_in_state(old_state, connector, old_conn_state, new_conn_state, i) {
1017 const struct drm_encoder_helper_funcs *funcs;
1018 struct drm_encoder *encoder;
1019 struct drm_bridge *bridge;
1020
1021 /*
1022 * Shut down everything that's in the changeset and currently
1023 * still on. So need to check the old, saved state.
1024 */
1025 if (!old_conn_state->crtc)
1026 continue;
1027
1028 old_crtc_state = drm_atomic_get_old_crtc_state(old_state, old_conn_state->crtc);
1029
1030 if (new_conn_state->crtc)
1031 new_crtc_state = drm_atomic_get_new_crtc_state(
1032 old_state,
1033 new_conn_state->crtc);
1034 else
1035 new_crtc_state = NULL;
1036
1037 if (!crtc_needs_disable(old_crtc_state, new_crtc_state) ||
1038 !drm_atomic_crtc_needs_modeset(old_conn_state->crtc->state))
1039 continue;
1040
1041 encoder = old_conn_state->best_encoder;
1042
1043 /* We shouldn't get this far if we didn't previously have
1044 * an encoder.. but WARN_ON() rather than explode.
1045 */
1046 if (WARN_ON(!encoder))
1047 continue;
1048
1049 funcs = encoder->helper_private;
1050
1051 DRM_DEBUG_ATOMIC("disabling [ENCODER:%d:%s]\n",
1052 encoder->base.id, encoder->name);
1053
1054 /*
1055 * Each encoder has at most one connector (since we always steal
1056 * it away), so we won't call disable hooks twice.
1057 */
1058 bridge = drm_bridge_chain_get_first_bridge(encoder);
1059 drm_atomic_bridge_chain_disable(bridge, old_state);
1060
1061 /* Right function depends upon target state. */
1062 if (funcs) {
1063 if (funcs->atomic_disable)
1064 funcs->atomic_disable(encoder, old_state);
1065 else if (new_conn_state->crtc && funcs->prepare)
1066 funcs->prepare(encoder);
1067 else if (funcs->disable)
1068 funcs->disable(encoder);
1069 else if (funcs->dpms)
1070 funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
1071 }
1072
1073 drm_atomic_bridge_chain_post_disable(bridge, old_state);
1074 }
1075
1076 for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
1077 const struct drm_crtc_helper_funcs *funcs;
1078 int ret;
1079
1080 /* Shut down everything that needs a full modeset. */
1081 if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
1082 continue;
1083
1084 if (!crtc_needs_disable(old_crtc_state, new_crtc_state))
1085 continue;
1086
1087 funcs = crtc->helper_private;
1088
1089 DRM_DEBUG_ATOMIC("disabling [CRTC:%d:%s]\n",
1090 crtc->base.id, crtc->name);
1091
1092
1093 /* Right function depends upon target state. */
1094 if (new_crtc_state->enable && funcs->prepare)
1095 funcs->prepare(crtc);
1096 else if (funcs->atomic_disable)
1097 funcs->atomic_disable(crtc, old_state);
1098 else if (funcs->disable)
1099 funcs->disable(crtc);
1100 else if (funcs->dpms)
1101 funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
1102
1103 if (!drm_dev_has_vblank(dev))
1104 continue;
1105
1106 ret = drm_crtc_vblank_get(crtc);
1107 WARN_ONCE(ret != -EINVAL, "driver forgot to call drm_crtc_vblank_off()\n");
1108 if (ret == 0)
1109 drm_crtc_vblank_put(crtc);
1110 }
1111}
1112
1113/**
1114 * drm_atomic_helper_update_legacy_modeset_state - update legacy modeset state
1115 * @dev: DRM device
1116 * @old_state: atomic state object with old state structures
1117 *
1118 * This function updates all the various legacy modeset state pointers in
1119 * connectors, encoders and CRTCs.
1120 *
1121 * Drivers can use this for building their own atomic commit if they don't have
1122 * a pure helper-based modeset implementation.
1123 *
1124 * Since these updates are not synchronized with lockings, only code paths
1125 * called from &drm_mode_config_helper_funcs.atomic_commit_tail can look at the
1126 * legacy state filled out by this helper. Defacto this means this helper and
1127 * the legacy state pointers are only really useful for transitioning an
1128 * existing driver to the atomic world.
1129 */
1130void
1131drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
1132 struct drm_atomic_state *old_state)
1133{
1134 struct drm_connector *connector;
1135 struct drm_connector_state *old_conn_state, *new_conn_state;
1136 struct drm_crtc *crtc;
1137 struct drm_crtc_state *new_crtc_state;
1138 int i;
1139
1140 /* clear out existing links and update dpms */
1141 for_each_oldnew_connector_in_state(old_state, connector, old_conn_state, new_conn_state, i) {
1142 if (connector->encoder) {
1143 WARN_ON(!connector->encoder->crtc);
1144
1145 connector->encoder->crtc = NULL;
1146 connector->encoder = NULL;
1147 }
1148
1149 crtc = new_conn_state->crtc;
1150 if ((!crtc && old_conn_state->crtc) ||
1151 (crtc && drm_atomic_crtc_needs_modeset(crtc->state))) {
1152 int mode = DRM_MODE_DPMS_OFF;
1153
1154 if (crtc && crtc->state->active)
1155 mode = DRM_MODE_DPMS_ON;
1156
1157 connector->dpms = mode;
1158 }
1159 }
1160
1161 /* set new links */
1162 for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
1163 if (!new_conn_state->crtc)
1164 continue;
1165
1166 if (WARN_ON(!new_conn_state->best_encoder))
1167 continue;
1168
1169 connector->encoder = new_conn_state->best_encoder;
1170 connector->encoder->crtc = new_conn_state->crtc;
1171 }
1172
1173 /* set legacy state in the crtc structure */
1174 for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
1175 struct drm_plane *primary = crtc->primary;
1176 struct drm_plane_state *new_plane_state;
1177
1178 crtc->mode = new_crtc_state->mode;
1179 crtc->enabled = new_crtc_state->enable;
1180
1181 new_plane_state =
1182 drm_atomic_get_new_plane_state(old_state, primary);
1183
1184 if (new_plane_state && new_plane_state->crtc == crtc) {
1185 crtc->x = new_plane_state->src_x >> 16;
1186 crtc->y = new_plane_state->src_y >> 16;
1187 }
1188 }
1189}
1190EXPORT_SYMBOL(drm_atomic_helper_update_legacy_modeset_state);
1191
1192/**
1193 * drm_atomic_helper_calc_timestamping_constants - update vblank timestamping constants
1194 * @state: atomic state object
1195 *
1196 * Updates the timestamping constants used for precise vblank timestamps
1197 * by calling drm_calc_timestamping_constants() for all enabled crtcs in @state.
1198 */
1199void drm_atomic_helper_calc_timestamping_constants(struct drm_atomic_state *state)
1200{
1201 struct drm_crtc_state *new_crtc_state;
1202 struct drm_crtc *crtc;
1203 int i;
1204
1205 for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1206 if (new_crtc_state->enable)
1207 drm_calc_timestamping_constants(crtc,
1208 &new_crtc_state->adjusted_mode);
1209 }
1210}
1211EXPORT_SYMBOL(drm_atomic_helper_calc_timestamping_constants);
1212
1213static void
1214crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
1215{
1216 struct drm_crtc *crtc;
1217 struct drm_crtc_state *new_crtc_state;
1218 struct drm_connector *connector;
1219 struct drm_connector_state *new_conn_state;
1220 int i;
1221
1222 for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
1223 const struct drm_crtc_helper_funcs *funcs;
1224
1225 if (!new_crtc_state->mode_changed)
1226 continue;
1227
1228 funcs = crtc->helper_private;
1229
1230 if (new_crtc_state->enable && funcs->mode_set_nofb) {
1231 DRM_DEBUG_ATOMIC("modeset on [CRTC:%d:%s]\n",
1232 crtc->base.id, crtc->name);
1233
1234 funcs->mode_set_nofb(crtc);
1235 }
1236 }
1237
1238 for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
1239 const struct drm_encoder_helper_funcs *funcs;
1240 struct drm_encoder *encoder;
1241 struct drm_display_mode *mode, *adjusted_mode;
1242 struct drm_bridge *bridge;
1243
1244 if (!new_conn_state->best_encoder)
1245 continue;
1246
1247 encoder = new_conn_state->best_encoder;
1248 funcs = encoder->helper_private;
1249 new_crtc_state = new_conn_state->crtc->state;
1250 mode = &new_crtc_state->mode;
1251 adjusted_mode = &new_crtc_state->adjusted_mode;
1252
1253 if (!new_crtc_state->mode_changed)
1254 continue;
1255
1256 DRM_DEBUG_ATOMIC("modeset on [ENCODER:%d:%s]\n",
1257 encoder->base.id, encoder->name);
1258
1259 /*
1260 * Each encoder has at most one connector (since we always steal
1261 * it away), so we won't call mode_set hooks twice.
1262 */
1263 if (funcs && funcs->atomic_mode_set) {
1264 funcs->atomic_mode_set(encoder, new_crtc_state,
1265 new_conn_state);
1266 } else if (funcs && funcs->mode_set) {
1267 funcs->mode_set(encoder, mode, adjusted_mode);
1268 }
1269
1270 bridge = drm_bridge_chain_get_first_bridge(encoder);
1271 drm_bridge_chain_mode_set(bridge, mode, adjusted_mode);
1272 }
1273}
1274
1275/**
1276 * drm_atomic_helper_commit_modeset_disables - modeset commit to disable outputs
1277 * @dev: DRM device
1278 * @old_state: atomic state object with old state structures
1279 *
1280 * This function shuts down all the outputs that need to be shut down and
1281 * prepares them (if required) with the new mode.
1282 *
1283 * For compatibility with legacy CRTC helpers this should be called before
1284 * drm_atomic_helper_commit_planes(), which is what the default commit function
1285 * does. But drivers with different needs can group the modeset commits together
1286 * and do the plane commits at the end. This is useful for drivers doing runtime
1287 * PM since planes updates then only happen when the CRTC is actually enabled.
1288 */
1289void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
1290 struct drm_atomic_state *old_state)
1291{
1292 disable_outputs(dev, old_state);
1293
1294 drm_atomic_helper_update_legacy_modeset_state(dev, old_state);
1295 drm_atomic_helper_calc_timestamping_constants(old_state);
1296
1297 crtc_set_mode(dev, old_state);
1298}
1299EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables);
1300
1301static void drm_atomic_helper_commit_writebacks(struct drm_device *dev,
1302 struct drm_atomic_state *old_state)
1303{
1304 struct drm_connector *connector;
1305 struct drm_connector_state *new_conn_state;
1306 int i;
1307
1308 for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
1309 const struct drm_connector_helper_funcs *funcs;
1310
1311 funcs = connector->helper_private;
1312 if (!funcs->atomic_commit)
1313 continue;
1314
1315 if (new_conn_state->writeback_job && new_conn_state->writeback_job->fb) {
1316 WARN_ON(connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK);
1317 funcs->atomic_commit(connector, old_state);
1318 }
1319 }
1320}
1321
1322/**
1323 * drm_atomic_helper_commit_modeset_enables - modeset commit to enable outputs
1324 * @dev: DRM device
1325 * @old_state: atomic state object with old state structures
1326 *
1327 * This function enables all the outputs with the new configuration which had to
1328 * be turned off for the update.
1329 *
1330 * For compatibility with legacy CRTC helpers this should be called after
1331 * drm_atomic_helper_commit_planes(), which is what the default commit function
1332 * does. But drivers with different needs can group the modeset commits together
1333 * and do the plane commits at the end. This is useful for drivers doing runtime
1334 * PM since planes updates then only happen when the CRTC is actually enabled.
1335 */
1336void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
1337 struct drm_atomic_state *old_state)
1338{
1339 struct drm_crtc *crtc;
1340 struct drm_crtc_state *old_crtc_state;
1341 struct drm_crtc_state *new_crtc_state;
1342 struct drm_connector *connector;
1343 struct drm_connector_state *new_conn_state;
1344 int i;
1345
1346 for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
1347 const struct drm_crtc_helper_funcs *funcs;
1348
1349 /* Need to filter out CRTCs where only planes change. */
1350 if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
1351 continue;
1352
1353 if (!new_crtc_state->active)
1354 continue;
1355
1356 funcs = crtc->helper_private;
1357
1358 if (new_crtc_state->enable) {
1359 DRM_DEBUG_ATOMIC("enabling [CRTC:%d:%s]\n",
1360 crtc->base.id, crtc->name);
1361 if (funcs->atomic_enable)
1362 funcs->atomic_enable(crtc, old_state);
1363 else if (funcs->commit)
1364 funcs->commit(crtc);
1365 }
1366 }
1367
1368 for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
1369 const struct drm_encoder_helper_funcs *funcs;
1370 struct drm_encoder *encoder;
1371 struct drm_bridge *bridge;
1372
1373 if (!new_conn_state->best_encoder)
1374 continue;
1375
1376 if (!new_conn_state->crtc->state->active ||
1377 !drm_atomic_crtc_needs_modeset(new_conn_state->crtc->state))
1378 continue;
1379
1380 encoder = new_conn_state->best_encoder;
1381 funcs = encoder->helper_private;
1382
1383 DRM_DEBUG_ATOMIC("enabling [ENCODER:%d:%s]\n",
1384 encoder->base.id, encoder->name);
1385
1386 /*
1387 * Each encoder has at most one connector (since we always steal
1388 * it away), so we won't call enable hooks twice.
1389 */
1390 bridge = drm_bridge_chain_get_first_bridge(encoder);
1391 drm_atomic_bridge_chain_pre_enable(bridge, old_state);
1392
1393 if (funcs) {
1394 if (funcs->atomic_enable)
1395 funcs->atomic_enable(encoder, old_state);
1396 else if (funcs->enable)
1397 funcs->enable(encoder);
1398 else if (funcs->commit)
1399 funcs->commit(encoder);
1400 }
1401
1402 drm_atomic_bridge_chain_enable(bridge, old_state);
1403 }
1404
1405 drm_atomic_helper_commit_writebacks(dev, old_state);
1406}
1407EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
1408
1409/**
1410 * drm_atomic_helper_wait_for_fences - wait for fences stashed in plane state
1411 * @dev: DRM device
1412 * @state: atomic state object with old state structures
1413 * @pre_swap: If true, do an interruptible wait, and @state is the new state.
1414 * Otherwise @state is the old state.
1415 *
1416 * For implicit sync, driver should fish the exclusive fence out from the
1417 * incoming fb's and stash it in the drm_plane_state. This is called after
1418 * drm_atomic_helper_swap_state() so it uses the current plane state (and
1419 * just uses the atomic state to find the changed planes)
1420 *
1421 * Note that @pre_swap is needed since the point where we block for fences moves
1422 * around depending upon whether an atomic commit is blocking or
1423 * non-blocking. For non-blocking commit all waiting needs to happen after
1424 * drm_atomic_helper_swap_state() is called, but for blocking commits we want
1425 * to wait **before** we do anything that can't be easily rolled back. That is
1426 * before we call drm_atomic_helper_swap_state().
1427 *
1428 * Returns zero if success or < 0 if dma_fence_wait() fails.
1429 */
1430int drm_atomic_helper_wait_for_fences(struct drm_device *dev,
1431 struct drm_atomic_state *state,
1432 bool pre_swap)
1433{
1434 struct drm_plane *plane;
1435 struct drm_plane_state *new_plane_state;
1436 int i, ret;
1437
1438 for_each_new_plane_in_state(state, plane, new_plane_state, i) {
1439 if (!new_plane_state->fence)
1440 continue;
1441
1442 WARN_ON(!new_plane_state->fb);
1443
1444 /*
1445 * If waiting for fences pre-swap (ie: nonblock), userspace can
1446 * still interrupt the operation. Instead of blocking until the
1447 * timer expires, make the wait interruptible.
1448 */
1449 ret = dma_fence_wait(new_plane_state->fence, pre_swap);
1450 if (ret)
1451 return ret;
1452
1453 dma_fence_put(new_plane_state->fence);
1454 new_plane_state->fence = NULL;
1455 }
1456
1457 return 0;
1458}
1459EXPORT_SYMBOL(drm_atomic_helper_wait_for_fences);
1460
1461/**
1462 * drm_atomic_helper_wait_for_vblanks - wait for vblank on CRTCs
1463 * @dev: DRM device
1464 * @old_state: atomic state object with old state structures
1465 *
1466 * Helper to, after atomic commit, wait for vblanks on all affected
1467 * CRTCs (ie. before cleaning up old framebuffers using
1468 * drm_atomic_helper_cleanup_planes()). It will only wait on CRTCs where the
1469 * framebuffers have actually changed to optimize for the legacy cursor and
1470 * plane update use-case.
1471 *
1472 * Drivers using the nonblocking commit tracking support initialized by calling
1473 * drm_atomic_helper_setup_commit() should look at
1474 * drm_atomic_helper_wait_for_flip_done() as an alternative.
1475 */
1476void
1477drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
1478 struct drm_atomic_state *old_state)
1479{
1480 struct drm_crtc *crtc;
1481 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
1482 int i, ret;
1483 unsigned int crtc_mask = 0;
1484
1485 /*
1486 * Legacy cursor ioctls are completely unsynced, and userspace
1487 * relies on that (by doing tons of cursor updates).
1488 */
1489 if (old_state->legacy_cursor_update)
1490 return;
1491
1492 for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
1493 if (!new_crtc_state->active)
1494 continue;
1495
1496 ret = drm_crtc_vblank_get(crtc);
1497 if (ret != 0)
1498 continue;
1499
1500 crtc_mask |= drm_crtc_mask(crtc);
1501 old_state->crtcs[i].last_vblank_count = drm_crtc_vblank_count(crtc);
1502 }
1503
1504 for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
1505 if (!(crtc_mask & drm_crtc_mask(crtc)))
1506 continue;
1507
1508 ret = wait_event_timeout(dev->vblank[i].queue,
1509 old_state->crtcs[i].last_vblank_count !=
1510 drm_crtc_vblank_count(crtc),
1511 msecs_to_jiffies(100));
1512
1513 WARN(!ret, "[CRTC:%d:%s] vblank wait timed out\n",
1514 crtc->base.id, crtc->name);
1515
1516 drm_crtc_vblank_put(crtc);
1517 }
1518}
1519EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
1520
1521/**
1522 * drm_atomic_helper_wait_for_flip_done - wait for all page flips to be done
1523 * @dev: DRM device
1524 * @old_state: atomic state object with old state structures
1525 *
1526 * Helper to, after atomic commit, wait for page flips on all affected
1527 * crtcs (ie. before cleaning up old framebuffers using
1528 * drm_atomic_helper_cleanup_planes()). Compared to
1529 * drm_atomic_helper_wait_for_vblanks() this waits for the completion on all
1530 * CRTCs, assuming that cursors-only updates are signalling their completion
1531 * immediately (or using a different path).
1532 *
1533 * This requires that drivers use the nonblocking commit tracking support
1534 * initialized using drm_atomic_helper_setup_commit().
1535 */
1536void drm_atomic_helper_wait_for_flip_done(struct drm_device *dev,
1537 struct drm_atomic_state *old_state)
1538{
1539 struct drm_crtc *crtc;
1540 int i;
1541
1542 for (i = 0; i < dev->mode_config.num_crtc; i++) {
1543 struct drm_crtc_commit *commit = old_state->crtcs[i].commit;
1544 int ret;
1545
1546 crtc = old_state->crtcs[i].ptr;
1547
1548 if (!crtc || !commit)
1549 continue;
1550
1551 ret = wait_for_completion_timeout(&commit->flip_done, 10 * HZ);
1552 if (ret == 0)
1553 DRM_ERROR("[CRTC:%d:%s] flip_done timed out\n",
1554 crtc->base.id, crtc->name);
1555 }
1556
1557 if (old_state->fake_commit)
1558 complete_all(&old_state->fake_commit->flip_done);
1559}
1560EXPORT_SYMBOL(drm_atomic_helper_wait_for_flip_done);
1561
1562/**
1563 * drm_atomic_helper_commit_tail - commit atomic update to hardware
1564 * @old_state: atomic state object with old state structures
1565 *
1566 * This is the default implementation for the
1567 * &drm_mode_config_helper_funcs.atomic_commit_tail hook, for drivers
1568 * that do not support runtime_pm or do not need the CRTC to be
1569 * enabled to perform a commit. Otherwise, see
1570 * drm_atomic_helper_commit_tail_rpm().
1571 *
1572 * Note that the default ordering of how the various stages are called is to
1573 * match the legacy modeset helper library closest.
1574 */
1575void drm_atomic_helper_commit_tail(struct drm_atomic_state *old_state)
1576{
1577 struct drm_device *dev = old_state->dev;
1578
1579 drm_atomic_helper_commit_modeset_disables(dev, old_state);
1580
1581 drm_atomic_helper_commit_planes(dev, old_state, 0);
1582
1583 drm_atomic_helper_commit_modeset_enables(dev, old_state);
1584
1585 drm_atomic_helper_fake_vblank(old_state);
1586
1587 drm_atomic_helper_commit_hw_done(old_state);
1588
1589 drm_atomic_helper_wait_for_vblanks(dev, old_state);
1590
1591 drm_atomic_helper_cleanup_planes(dev, old_state);
1592}
1593EXPORT_SYMBOL(drm_atomic_helper_commit_tail);
1594
1595/**
1596 * drm_atomic_helper_commit_tail_rpm - commit atomic update to hardware
1597 * @old_state: new modeset state to be committed
1598 *
1599 * This is an alternative implementation for the
1600 * &drm_mode_config_helper_funcs.atomic_commit_tail hook, for drivers
1601 * that support runtime_pm or need the CRTC to be enabled to perform a
1602 * commit. Otherwise, one should use the default implementation
1603 * drm_atomic_helper_commit_tail().
1604 */
1605void drm_atomic_helper_commit_tail_rpm(struct drm_atomic_state *old_state)
1606{
1607 struct drm_device *dev = old_state->dev;
1608
1609 drm_atomic_helper_commit_modeset_disables(dev, old_state);
1610
1611 drm_atomic_helper_commit_modeset_enables(dev, old_state);
1612
1613 drm_atomic_helper_commit_planes(dev, old_state,
1614 DRM_PLANE_COMMIT_ACTIVE_ONLY);
1615
1616 drm_atomic_helper_fake_vblank(old_state);
1617
1618 drm_atomic_helper_commit_hw_done(old_state);
1619
1620 drm_atomic_helper_wait_for_vblanks(dev, old_state);
1621
1622 drm_atomic_helper_cleanup_planes(dev, old_state);
1623}
1624EXPORT_SYMBOL(drm_atomic_helper_commit_tail_rpm);
1625
1626static void commit_tail(struct drm_atomic_state *old_state)
1627{
1628 struct drm_device *dev = old_state->dev;
1629 const struct drm_mode_config_helper_funcs *funcs;
1630 struct drm_crtc_state *new_crtc_state;
1631 struct drm_crtc *crtc;
1632 ktime_t start;
1633 s64 commit_time_ms;
1634 unsigned int i, new_self_refresh_mask = 0;
1635
1636 funcs = dev->mode_config.helper_private;
1637
1638 /*
1639 * We're measuring the _entire_ commit, so the time will vary depending
1640 * on how many fences and objects are involved. For the purposes of self
1641 * refresh, this is desirable since it'll give us an idea of how
1642 * congested things are. This will inform our decision on how often we
1643 * should enter self refresh after idle.
1644 *
1645 * These times will be averaged out in the self refresh helpers to avoid
1646 * overreacting over one outlier frame
1647 */
1648 start = ktime_get();
1649
1650 drm_atomic_helper_wait_for_fences(dev, old_state, false);
1651
1652 drm_atomic_helper_wait_for_dependencies(old_state);
1653
1654 /*
1655 * We cannot safely access new_crtc_state after
1656 * drm_atomic_helper_commit_hw_done() so figure out which crtc's have
1657 * self-refresh active beforehand:
1658 */
1659 for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i)
1660 if (new_crtc_state->self_refresh_active)
1661 new_self_refresh_mask |= BIT(i);
1662
1663 if (funcs && funcs->atomic_commit_tail)
1664 funcs->atomic_commit_tail(old_state);
1665 else
1666 drm_atomic_helper_commit_tail(old_state);
1667
1668 commit_time_ms = ktime_ms_delta(ktime_get(), start);
1669 if (commit_time_ms > 0)
1670 drm_self_refresh_helper_update_avg_times(old_state,
1671 (unsigned long)commit_time_ms,
1672 new_self_refresh_mask);
1673
1674 drm_atomic_helper_commit_cleanup_done(old_state);
1675
1676 drm_atomic_state_put(old_state);
1677}
1678
1679static void commit_work(struct work_struct *work)
1680{
1681 struct drm_atomic_state *state = container_of(work,
1682 struct drm_atomic_state,
1683 commit_work);
1684 commit_tail(state);
1685}
1686
1687/**
1688 * drm_atomic_helper_async_check - check if state can be commited asynchronously
1689 * @dev: DRM device
1690 * @state: the driver state object
1691 *
1692 * This helper will check if it is possible to commit the state asynchronously.
1693 * Async commits are not supposed to swap the states like normal sync commits
1694 * but just do in-place changes on the current state.
1695 *
1696 * It will return 0 if the commit can happen in an asynchronous fashion or error
1697 * if not. Note that error just mean it can't be commited asynchronously, if it
1698 * fails the commit should be treated like a normal synchronous commit.
1699 */
1700int drm_atomic_helper_async_check(struct drm_device *dev,
1701 struct drm_atomic_state *state)
1702{
1703 struct drm_crtc *crtc;
1704 struct drm_crtc_state *crtc_state;
1705 struct drm_plane *plane = NULL;
1706 struct drm_plane_state *old_plane_state = NULL;
1707 struct drm_plane_state *new_plane_state = NULL;
1708 const struct drm_plane_helper_funcs *funcs;
1709 int i, n_planes = 0;
1710
1711 for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1712 if (drm_atomic_crtc_needs_modeset(crtc_state))
1713 return -EINVAL;
1714 }
1715
1716 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i)
1717 n_planes++;
1718
1719 /* FIXME: we support only single plane updates for now */
1720 if (n_planes != 1)
1721 return -EINVAL;
1722
1723 if (!new_plane_state->crtc ||
1724 old_plane_state->crtc != new_plane_state->crtc)
1725 return -EINVAL;
1726
1727 funcs = plane->helper_private;
1728 if (!funcs->atomic_async_update)
1729 return -EINVAL;
1730
1731 if (new_plane_state->fence)
1732 return -EINVAL;
1733
1734 /*
1735 * Don't do an async update if there is an outstanding commit modifying
1736 * the plane. This prevents our async update's changes from getting
1737 * overridden by a previous synchronous update's state.
1738 */
1739 if (old_plane_state->commit &&
1740 !try_wait_for_completion(&old_plane_state->commit->hw_done)) {
1741 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] inflight previous commit preventing async commit\n",
1742 plane->base.id, plane->name);
1743 return -EBUSY;
1744 }
1745
1746 return funcs->atomic_async_check(plane, state);
1747}
1748EXPORT_SYMBOL(drm_atomic_helper_async_check);
1749
1750/**
1751 * drm_atomic_helper_async_commit - commit state asynchronously
1752 * @dev: DRM device
1753 * @state: the driver state object
1754 *
1755 * This function commits a state asynchronously, i.e., not vblank
1756 * synchronized. It should be used on a state only when
1757 * drm_atomic_async_check() succeeds. Async commits are not supposed to swap
1758 * the states like normal sync commits, but just do in-place changes on the
1759 * current state.
1760 *
1761 * TODO: Implement full swap instead of doing in-place changes.
1762 */
1763void drm_atomic_helper_async_commit(struct drm_device *dev,
1764 struct drm_atomic_state *state)
1765{
1766 struct drm_plane *plane;
1767 struct drm_plane_state *plane_state;
1768 const struct drm_plane_helper_funcs *funcs;
1769 int i;
1770
1771 for_each_new_plane_in_state(state, plane, plane_state, i) {
1772 struct drm_framebuffer *new_fb = plane_state->fb;
1773 struct drm_framebuffer *old_fb = plane->state->fb;
1774
1775 funcs = plane->helper_private;
1776 funcs->atomic_async_update(plane, state);
1777
1778 /*
1779 * ->atomic_async_update() is supposed to update the
1780 * plane->state in-place, make sure at least common
1781 * properties have been properly updated.
1782 */
1783 WARN_ON_ONCE(plane->state->fb != new_fb);
1784 WARN_ON_ONCE(plane->state->crtc_x != plane_state->crtc_x);
1785 WARN_ON_ONCE(plane->state->crtc_y != plane_state->crtc_y);
1786 WARN_ON_ONCE(plane->state->src_x != plane_state->src_x);
1787 WARN_ON_ONCE(plane->state->src_y != plane_state->src_y);
1788
1789 /*
1790 * Make sure the FBs have been swapped so that cleanups in the
1791 * new_state performs a cleanup in the old FB.
1792 */
1793 WARN_ON_ONCE(plane_state->fb != old_fb);
1794 }
1795}
1796EXPORT_SYMBOL(drm_atomic_helper_async_commit);
1797
1798/**
1799 * drm_atomic_helper_commit - commit validated state object
1800 * @dev: DRM device
1801 * @state: the driver state object
1802 * @nonblock: whether nonblocking behavior is requested.
1803 *
1804 * This function commits a with drm_atomic_helper_check() pre-validated state
1805 * object. This can still fail when e.g. the framebuffer reservation fails. This
1806 * function implements nonblocking commits, using
1807 * drm_atomic_helper_setup_commit() and related functions.
1808 *
1809 * Committing the actual hardware state is done through the
1810 * &drm_mode_config_helper_funcs.atomic_commit_tail callback, or its default
1811 * implementation drm_atomic_helper_commit_tail().
1812 *
1813 * RETURNS:
1814 * Zero for success or -errno.
1815 */
1816int drm_atomic_helper_commit(struct drm_device *dev,
1817 struct drm_atomic_state *state,
1818 bool nonblock)
1819{
1820 int ret;
1821
1822 if (state->async_update) {
1823 ret = drm_atomic_helper_prepare_planes(dev, state);
1824 if (ret)
1825 return ret;
1826
1827 drm_atomic_helper_async_commit(dev, state);
1828 drm_atomic_helper_cleanup_planes(dev, state);
1829
1830 return 0;
1831 }
1832
1833 ret = drm_atomic_helper_setup_commit(state, nonblock);
1834 if (ret)
1835 return ret;
1836
1837 INIT_WORK(&state->commit_work, commit_work);
1838
1839 ret = drm_atomic_helper_prepare_planes(dev, state);
1840 if (ret)
1841 return ret;
1842
1843 if (!nonblock) {
1844 ret = drm_atomic_helper_wait_for_fences(dev, state, true);
1845 if (ret)
1846 goto err;
1847 }
1848
1849 /*
1850 * This is the point of no return - everything below never fails except
1851 * when the hw goes bonghits. Which means we can commit the new state on
1852 * the software side now.
1853 */
1854
1855 ret = drm_atomic_helper_swap_state(state, true);
1856 if (ret)
1857 goto err;
1858
1859 /*
1860 * Everything below can be run asynchronously without the need to grab
1861 * any modeset locks at all under one condition: It must be guaranteed
1862 * that the asynchronous work has either been cancelled (if the driver
1863 * supports it, which at least requires that the framebuffers get
1864 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
1865 * before the new state gets committed on the software side with
1866 * drm_atomic_helper_swap_state().
1867 *
1868 * This scheme allows new atomic state updates to be prepared and
1869 * checked in parallel to the asynchronous completion of the previous
1870 * update. Which is important since compositors need to figure out the
1871 * composition of the next frame right after having submitted the
1872 * current layout.
1873 *
1874 * NOTE: Commit work has multiple phases, first hardware commit, then
1875 * cleanup. We want them to overlap, hence need system_unbound_wq to
1876 * make sure work items don't artificially stall on each another.
1877 */
1878
1879 drm_atomic_state_get(state);
1880 if (nonblock)
1881 queue_work(system_unbound_wq, &state->commit_work);
1882 else
1883 commit_tail(state);
1884
1885 return 0;
1886
1887err:
1888 drm_atomic_helper_cleanup_planes(dev, state);
1889 return ret;
1890}
1891EXPORT_SYMBOL(drm_atomic_helper_commit);
1892
1893/**
1894 * DOC: implementing nonblocking commit
1895 *
1896 * Nonblocking atomic commits should use struct &drm_crtc_commit to sequence
1897 * different operations against each another. Locks, especially struct
1898 * &drm_modeset_lock, should not be held in worker threads or any other
1899 * asynchronous context used to commit the hardware state.
1900 *
1901 * drm_atomic_helper_commit() implements the recommended sequence for
1902 * nonblocking commits, using drm_atomic_helper_setup_commit() internally:
1903 *
1904 * 1. Run drm_atomic_helper_prepare_planes(). Since this can fail and we
1905 * need to propagate out of memory/VRAM errors to userspace, it must be called
1906 * synchronously.
1907 *
1908 * 2. Synchronize with any outstanding nonblocking commit worker threads which
1909 * might be affected by the new state update. This is handled by
1910 * drm_atomic_helper_setup_commit().
1911 *
1912 * Asynchronous workers need to have sufficient parallelism to be able to run
1913 * different atomic commits on different CRTCs in parallel. The simplest way to
1914 * achieve this is by running them on the &system_unbound_wq work queue. Note
1915 * that drivers are not required to split up atomic commits and run an
1916 * individual commit in parallel - userspace is supposed to do that if it cares.
1917 * But it might be beneficial to do that for modesets, since those necessarily
1918 * must be done as one global operation, and enabling or disabling a CRTC can
1919 * take a long time. But even that is not required.
1920 *
1921 * IMPORTANT: A &drm_atomic_state update for multiple CRTCs is sequenced
1922 * against all CRTCs therein. Therefore for atomic state updates which only flip
1923 * planes the driver must not get the struct &drm_crtc_state of unrelated CRTCs
1924 * in its atomic check code: This would prevent committing of atomic updates to
1925 * multiple CRTCs in parallel. In general, adding additional state structures
1926 * should be avoided as much as possible, because this reduces parallelism in
1927 * (nonblocking) commits, both due to locking and due to commit sequencing
1928 * requirements.
1929 *
1930 * 3. The software state is updated synchronously with
1931 * drm_atomic_helper_swap_state(). Doing this under the protection of all modeset
1932 * locks means concurrent callers never see inconsistent state. Note that commit
1933 * workers do not hold any locks; their access is only coordinated through
1934 * ordering. If workers would access state only through the pointers in the
1935 * free-standing state objects (currently not the case for any driver) then even
1936 * multiple pending commits could be in-flight at the same time.
1937 *
1938 * 4. Schedule a work item to do all subsequent steps, using the split-out
1939 * commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and
1940 * then cleaning up the framebuffers after the old framebuffer is no longer
1941 * being displayed. The scheduled work should synchronize against other workers
1942 * using the &drm_crtc_commit infrastructure as needed. See
1943 * drm_atomic_helper_setup_commit() for more details.
1944 */
1945
1946static int stall_checks(struct drm_crtc *crtc, bool nonblock)
1947{
1948 struct drm_crtc_commit *commit, *stall_commit = NULL;
1949 bool completed = true;
1950 int i;
1951 long ret = 0;
1952
1953 spin_lock(&crtc->commit_lock);
1954 i = 0;
1955 list_for_each_entry(commit, &crtc->commit_list, commit_entry) {
1956 if (i == 0) {
1957 completed = try_wait_for_completion(&commit->flip_done);
1958 /*
1959 * Userspace is not allowed to get ahead of the previous
1960 * commit with nonblocking ones.
1961 */
1962 if (!completed && nonblock) {
1963 spin_unlock(&crtc->commit_lock);
1964 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] busy with a previous commit\n",
1965 crtc->base.id, crtc->name);
1966
1967 return -EBUSY;
1968 }
1969 } else if (i == 1) {
1970 stall_commit = drm_crtc_commit_get(commit);
1971 break;
1972 }
1973
1974 i++;
1975 }
1976 spin_unlock(&crtc->commit_lock);
1977
1978 if (!stall_commit)
1979 return 0;
1980
1981 /* We don't want to let commits get ahead of cleanup work too much,
1982 * stalling on 2nd previous commit means triple-buffer won't ever stall.
1983 */
1984 ret = wait_for_completion_interruptible_timeout(&stall_commit->cleanup_done,
1985 10*HZ);
1986 if (ret == 0)
1987 DRM_ERROR("[CRTC:%d:%s] cleanup_done timed out\n",
1988 crtc->base.id, crtc->name);
1989
1990 drm_crtc_commit_put(stall_commit);
1991
1992 return ret < 0 ? ret : 0;
1993}
1994
1995static void release_crtc_commit(struct completion *completion)
1996{
1997 struct drm_crtc_commit *commit = container_of(completion,
1998 typeof(*commit),
1999 flip_done);
2000
2001 drm_crtc_commit_put(commit);
2002}
2003
2004static void init_commit(struct drm_crtc_commit *commit, struct drm_crtc *crtc)
2005{
2006 init_completion(&commit->flip_done);
2007 init_completion(&commit->hw_done);
2008 init_completion(&commit->cleanup_done);
2009 INIT_LIST_HEAD(&commit->commit_entry);
2010 kref_init(&commit->ref);
2011 commit->crtc = crtc;
2012}
2013
2014static struct drm_crtc_commit *
2015crtc_or_fake_commit(struct drm_atomic_state *state, struct drm_crtc *crtc)
2016{
2017 if (crtc) {
2018 struct drm_crtc_state *new_crtc_state;
2019
2020 new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
2021
2022 return new_crtc_state->commit;
2023 }
2024
2025 if (!state->fake_commit) {
2026 state->fake_commit = kzalloc(sizeof(*state->fake_commit), GFP_KERNEL);
2027 if (!state->fake_commit)
2028 return NULL;
2029
2030 init_commit(state->fake_commit, NULL);
2031 }
2032
2033 return state->fake_commit;
2034}
2035
2036/**
2037 * drm_atomic_helper_setup_commit - setup possibly nonblocking commit
2038 * @state: new modeset state to be committed
2039 * @nonblock: whether nonblocking behavior is requested.
2040 *
2041 * This function prepares @state to be used by the atomic helper's support for
2042 * nonblocking commits. Drivers using the nonblocking commit infrastructure
2043 * should always call this function from their
2044 * &drm_mode_config_funcs.atomic_commit hook.
2045 *
2046 * Drivers that need to extend the commit setup to private objects can use the
2047 * &drm_mode_config_helper_funcs.atomic_commit_setup hook.
2048 *
2049 * To be able to use this support drivers need to use a few more helper
2050 * functions. drm_atomic_helper_wait_for_dependencies() must be called before
2051 * actually committing the hardware state, and for nonblocking commits this call
2052 * must be placed in the async worker. See also drm_atomic_helper_swap_state()
2053 * and its stall parameter, for when a driver's commit hooks look at the
2054 * &drm_crtc.state, &drm_plane.state or &drm_connector.state pointer directly.
2055 *
2056 * Completion of the hardware commit step must be signalled using
2057 * drm_atomic_helper_commit_hw_done(). After this step the driver is not allowed
2058 * to read or change any permanent software or hardware modeset state. The only
2059 * exception is state protected by other means than &drm_modeset_lock locks.
2060 * Only the free standing @state with pointers to the old state structures can
2061 * be inspected, e.g. to clean up old buffers using
2062 * drm_atomic_helper_cleanup_planes().
2063 *
2064 * At the very end, before cleaning up @state drivers must call
2065 * drm_atomic_helper_commit_cleanup_done().
2066 *
2067 * This is all implemented by in drm_atomic_helper_commit(), giving drivers a
2068 * complete and easy-to-use default implementation of the atomic_commit() hook.
2069 *
2070 * The tracking of asynchronously executed and still pending commits is done
2071 * using the core structure &drm_crtc_commit.
2072 *
2073 * By default there's no need to clean up resources allocated by this function
2074 * explicitly: drm_atomic_state_default_clear() will take care of that
2075 * automatically.
2076 *
2077 * Returns:
2078 *
2079 * 0 on success. -EBUSY when userspace schedules nonblocking commits too fast,
2080 * -ENOMEM on allocation failures and -EINTR when a signal is pending.
2081 */
2082int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
2083 bool nonblock)
2084{
2085 struct drm_crtc *crtc;
2086 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
2087 struct drm_connector *conn;
2088 struct drm_connector_state *old_conn_state, *new_conn_state;
2089 struct drm_plane *plane;
2090 struct drm_plane_state *old_plane_state, *new_plane_state;
2091 struct drm_crtc_commit *commit;
2092 const struct drm_mode_config_helper_funcs *funcs;
2093 int i, ret;
2094
2095 funcs = state->dev->mode_config.helper_private;
2096
2097 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
2098 commit = kzalloc(sizeof(*commit), GFP_KERNEL);
2099 if (!commit)
2100 return -ENOMEM;
2101
2102 init_commit(commit, crtc);
2103
2104 new_crtc_state->commit = commit;
2105
2106 ret = stall_checks(crtc, nonblock);
2107 if (ret)
2108 return ret;
2109
2110 /*
2111 * Drivers only send out events when at least either current or
2112 * new CRTC state is active. Complete right away if everything
2113 * stays off.
2114 */
2115 if (!old_crtc_state->active && !new_crtc_state->active) {
2116 complete_all(&commit->flip_done);
2117 continue;
2118 }
2119
2120 /* Legacy cursor updates are fully unsynced. */
2121 if (state->legacy_cursor_update) {
2122 complete_all(&commit->flip_done);
2123 continue;
2124 }
2125
2126 if (!new_crtc_state->event) {
2127 commit->event = kzalloc(sizeof(*commit->event),
2128 GFP_KERNEL);
2129 if (!commit->event)
2130 return -ENOMEM;
2131
2132 new_crtc_state->event = commit->event;
2133 }
2134
2135 new_crtc_state->event->base.completion = &commit->flip_done;
2136 new_crtc_state->event->base.completion_release = release_crtc_commit;
2137 drm_crtc_commit_get(commit);
2138
2139 commit->abort_completion = true;
2140
2141 state->crtcs[i].commit = commit;
2142 drm_crtc_commit_get(commit);
2143 }
2144
2145 for_each_oldnew_connector_in_state(state, conn, old_conn_state, new_conn_state, i) {
2146 /*
2147 * Userspace is not allowed to get ahead of the previous
2148 * commit with nonblocking ones.
2149 */
2150 if (nonblock && old_conn_state->commit &&
2151 !try_wait_for_completion(&old_conn_state->commit->flip_done)) {
2152 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] busy with a previous commit\n",
2153 conn->base.id, conn->name);
2154
2155 return -EBUSY;
2156 }
2157
2158 /* Always track connectors explicitly for e.g. link retraining. */
2159 commit = crtc_or_fake_commit(state, new_conn_state->crtc ?: old_conn_state->crtc);
2160 if (!commit)
2161 return -ENOMEM;
2162
2163 new_conn_state->commit = drm_crtc_commit_get(commit);
2164 }
2165
2166 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
2167 /*
2168 * Userspace is not allowed to get ahead of the previous
2169 * commit with nonblocking ones.
2170 */
2171 if (nonblock && old_plane_state->commit &&
2172 !try_wait_for_completion(&old_plane_state->commit->flip_done)) {
2173 DRM_DEBUG_ATOMIC("[PLANE:%d:%s] busy with a previous commit\n",
2174 plane->base.id, plane->name);
2175
2176 return -EBUSY;
2177 }
2178
2179 /* Always track planes explicitly for async pageflip support. */
2180 commit = crtc_or_fake_commit(state, new_plane_state->crtc ?: old_plane_state->crtc);
2181 if (!commit)
2182 return -ENOMEM;
2183
2184 new_plane_state->commit = drm_crtc_commit_get(commit);
2185 }
2186
2187 if (funcs && funcs->atomic_commit_setup)
2188 return funcs->atomic_commit_setup(state);
2189
2190 return 0;
2191}
2192EXPORT_SYMBOL(drm_atomic_helper_setup_commit);
2193
2194/**
2195 * drm_atomic_helper_wait_for_dependencies - wait for required preceeding commits
2196 * @old_state: atomic state object with old state structures
2197 *
2198 * This function waits for all preceeding commits that touch the same CRTC as
2199 * @old_state to both be committed to the hardware (as signalled by
2200 * drm_atomic_helper_commit_hw_done()) and executed by the hardware (as signalled
2201 * by calling drm_crtc_send_vblank_event() on the &drm_crtc_state.event).
2202 *
2203 * This is part of the atomic helper support for nonblocking commits, see
2204 * drm_atomic_helper_setup_commit() for an overview.
2205 */
2206void drm_atomic_helper_wait_for_dependencies(struct drm_atomic_state *old_state)
2207{
2208 struct drm_crtc *crtc;
2209 struct drm_crtc_state *old_crtc_state;
2210 struct drm_plane *plane;
2211 struct drm_plane_state *old_plane_state;
2212 struct drm_connector *conn;
2213 struct drm_connector_state *old_conn_state;
2214 int i;
2215 long ret;
2216
2217 for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
2218 ret = drm_crtc_commit_wait(old_crtc_state->commit);
2219 if (ret)
2220 DRM_ERROR("[CRTC:%d:%s] commit wait timed out\n",
2221 crtc->base.id, crtc->name);
2222 }
2223
2224 for_each_old_connector_in_state(old_state, conn, old_conn_state, i) {
2225 ret = drm_crtc_commit_wait(old_conn_state->commit);
2226 if (ret)
2227 DRM_ERROR("[CONNECTOR:%d:%s] commit wait timed out\n",
2228 conn->base.id, conn->name);
2229 }
2230
2231 for_each_old_plane_in_state(old_state, plane, old_plane_state, i) {
2232 ret = drm_crtc_commit_wait(old_plane_state->commit);
2233 if (ret)
2234 DRM_ERROR("[PLANE:%d:%s] commit wait timed out\n",
2235 plane->base.id, plane->name);
2236 }
2237}
2238EXPORT_SYMBOL(drm_atomic_helper_wait_for_dependencies);
2239
2240/**
2241 * drm_atomic_helper_fake_vblank - fake VBLANK events if needed
2242 * @old_state: atomic state object with old state structures
2243 *
2244 * This function walks all CRTCs and fakes VBLANK events on those with
2245 * &drm_crtc_state.no_vblank set to true and &drm_crtc_state.event != NULL.
2246 * The primary use of this function is writeback connectors working in oneshot
2247 * mode and faking VBLANK events. In this case they only fake the VBLANK event
2248 * when a job is queued, and any change to the pipeline that does not touch the
2249 * connector is leading to timeouts when calling
2250 * drm_atomic_helper_wait_for_vblanks() or
2251 * drm_atomic_helper_wait_for_flip_done(). In addition to writeback
2252 * connectors, this function can also fake VBLANK events for CRTCs without
2253 * VBLANK interrupt.
2254 *
2255 * This is part of the atomic helper support for nonblocking commits, see
2256 * drm_atomic_helper_setup_commit() for an overview.
2257 */
2258void drm_atomic_helper_fake_vblank(struct drm_atomic_state *old_state)
2259{
2260 struct drm_crtc_state *new_crtc_state;
2261 struct drm_crtc *crtc;
2262 int i;
2263
2264 for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
2265 unsigned long flags;
2266
2267 if (!new_crtc_state->no_vblank)
2268 continue;
2269
2270 spin_lock_irqsave(&old_state->dev->event_lock, flags);
2271 if (new_crtc_state->event) {
2272 drm_crtc_send_vblank_event(crtc,
2273 new_crtc_state->event);
2274 new_crtc_state->event = NULL;
2275 }
2276 spin_unlock_irqrestore(&old_state->dev->event_lock, flags);
2277 }
2278}
2279EXPORT_SYMBOL(drm_atomic_helper_fake_vblank);
2280
2281/**
2282 * drm_atomic_helper_commit_hw_done - setup possible nonblocking commit
2283 * @old_state: atomic state object with old state structures
2284 *
2285 * This function is used to signal completion of the hardware commit step. After
2286 * this step the driver is not allowed to read or change any permanent software
2287 * or hardware modeset state. The only exception is state protected by other
2288 * means than &drm_modeset_lock locks.
2289 *
2290 * Drivers should try to postpone any expensive or delayed cleanup work after
2291 * this function is called.
2292 *
2293 * This is part of the atomic helper support for nonblocking commits, see
2294 * drm_atomic_helper_setup_commit() for an overview.
2295 */
2296void drm_atomic_helper_commit_hw_done(struct drm_atomic_state *old_state)
2297{
2298 struct drm_crtc *crtc;
2299 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
2300 struct drm_crtc_commit *commit;
2301 int i;
2302
2303 for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
2304 commit = new_crtc_state->commit;
2305 if (!commit)
2306 continue;
2307
2308 /*
2309 * copy new_crtc_state->commit to old_crtc_state->commit,
2310 * it's unsafe to touch new_crtc_state after hw_done,
2311 * but we still need to do so in cleanup_done().
2312 */
2313 if (old_crtc_state->commit)
2314 drm_crtc_commit_put(old_crtc_state->commit);
2315
2316 old_crtc_state->commit = drm_crtc_commit_get(commit);
2317
2318 /* backend must have consumed any event by now */
2319 WARN_ON(new_crtc_state->event);
2320 complete_all(&commit->hw_done);
2321 }
2322
2323 if (old_state->fake_commit) {
2324 complete_all(&old_state->fake_commit->hw_done);
2325 complete_all(&old_state->fake_commit->flip_done);
2326 }
2327}
2328EXPORT_SYMBOL(drm_atomic_helper_commit_hw_done);
2329
2330/**
2331 * drm_atomic_helper_commit_cleanup_done - signal completion of commit
2332 * @old_state: atomic state object with old state structures
2333 *
2334 * This signals completion of the atomic update @old_state, including any
2335 * cleanup work. If used, it must be called right before calling
2336 * drm_atomic_state_put().
2337 *
2338 * This is part of the atomic helper support for nonblocking commits, see
2339 * drm_atomic_helper_setup_commit() for an overview.
2340 */
2341void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *old_state)
2342{
2343 struct drm_crtc *crtc;
2344 struct drm_crtc_state *old_crtc_state;
2345 struct drm_crtc_commit *commit;
2346 int i;
2347
2348 for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
2349 commit = old_crtc_state->commit;
2350 if (WARN_ON(!commit))
2351 continue;
2352
2353 complete_all(&commit->cleanup_done);
2354 WARN_ON(!try_wait_for_completion(&commit->hw_done));
2355
2356 spin_lock(&crtc->commit_lock);
2357 list_del(&commit->commit_entry);
2358 spin_unlock(&crtc->commit_lock);
2359 }
2360
2361 if (old_state->fake_commit) {
2362 complete_all(&old_state->fake_commit->cleanup_done);
2363 WARN_ON(!try_wait_for_completion(&old_state->fake_commit->hw_done));
2364 }
2365}
2366EXPORT_SYMBOL(drm_atomic_helper_commit_cleanup_done);
2367
2368/**
2369 * drm_atomic_helper_prepare_planes - prepare plane resources before commit
2370 * @dev: DRM device
2371 * @state: atomic state object with new state structures
2372 *
2373 * This function prepares plane state, specifically framebuffers, for the new
2374 * configuration, by calling &drm_plane_helper_funcs.prepare_fb. If any failure
2375 * is encountered this function will call &drm_plane_helper_funcs.cleanup_fb on
2376 * any already successfully prepared framebuffer.
2377 *
2378 * Returns:
2379 * 0 on success, negative error code on failure.
2380 */
2381int drm_atomic_helper_prepare_planes(struct drm_device *dev,
2382 struct drm_atomic_state *state)
2383{
2384 struct drm_connector *connector;
2385 struct drm_connector_state *new_conn_state;
2386 struct drm_plane *plane;
2387 struct drm_plane_state *new_plane_state;
2388 int ret, i, j;
2389
2390 for_each_new_connector_in_state(state, connector, new_conn_state, i) {
2391 if (!new_conn_state->writeback_job)
2392 continue;
2393
2394 ret = drm_writeback_prepare_job(new_conn_state->writeback_job);
2395 if (ret < 0)
2396 return ret;
2397 }
2398
2399 for_each_new_plane_in_state(state, plane, new_plane_state, i) {
2400 const struct drm_plane_helper_funcs *funcs;
2401
2402 funcs = plane->helper_private;
2403
2404 if (funcs->prepare_fb) {
2405 ret = funcs->prepare_fb(plane, new_plane_state);
2406 if (ret)
2407 goto fail;
2408 }
2409 }
2410
2411 return 0;
2412
2413fail:
2414 for_each_new_plane_in_state(state, plane, new_plane_state, j) {
2415 const struct drm_plane_helper_funcs *funcs;
2416
2417 if (j >= i)
2418 continue;
2419
2420 funcs = plane->helper_private;
2421
2422 if (funcs->cleanup_fb)
2423 funcs->cleanup_fb(plane, new_plane_state);
2424 }
2425
2426 return ret;
2427}
2428EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
2429
2430static bool plane_crtc_active(const struct drm_plane_state *state)
2431{
2432 return state->crtc && state->crtc->state->active;
2433}
2434
2435/**
2436 * drm_atomic_helper_commit_planes - commit plane state
2437 * @dev: DRM device
2438 * @old_state: atomic state object with old state structures
2439 * @flags: flags for committing plane state
2440 *
2441 * This function commits the new plane state using the plane and atomic helper
2442 * functions for planes and CRTCs. It assumes that the atomic state has already
2443 * been pushed into the relevant object state pointers, since this step can no
2444 * longer fail.
2445 *
2446 * It still requires the global state object @old_state to know which planes and
2447 * crtcs need to be updated though.
2448 *
2449 * Note that this function does all plane updates across all CRTCs in one step.
2450 * If the hardware can't support this approach look at
2451 * drm_atomic_helper_commit_planes_on_crtc() instead.
2452 *
2453 * Plane parameters can be updated by applications while the associated CRTC is
2454 * disabled. The DRM/KMS core will store the parameters in the plane state,
2455 * which will be available to the driver when the CRTC is turned on. As a result
2456 * most drivers don't need to be immediately notified of plane updates for a
2457 * disabled CRTC.
2458 *
2459 * Unless otherwise needed, drivers are advised to set the ACTIVE_ONLY flag in
2460 * @flags in order not to receive plane update notifications related to a
2461 * disabled CRTC. This avoids the need to manually ignore plane updates in
2462 * driver code when the driver and/or hardware can't or just don't need to deal
2463 * with updates on disabled CRTCs, for example when supporting runtime PM.
2464 *
2465 * Drivers may set the NO_DISABLE_AFTER_MODESET flag in @flags if the relevant
2466 * display controllers require to disable a CRTC's planes when the CRTC is
2467 * disabled. This function would skip the &drm_plane_helper_funcs.atomic_disable
2468 * call for a plane if the CRTC of the old plane state needs a modesetting
2469 * operation. Of course, the drivers need to disable the planes in their CRTC
2470 * disable callbacks since no one else would do that.
2471 *
2472 * The drm_atomic_helper_commit() default implementation doesn't set the
2473 * ACTIVE_ONLY flag to most closely match the behaviour of the legacy helpers.
2474 * This should not be copied blindly by drivers.
2475 */
2476void drm_atomic_helper_commit_planes(struct drm_device *dev,
2477 struct drm_atomic_state *old_state,
2478 uint32_t flags)
2479{
2480 struct drm_crtc *crtc;
2481 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
2482 struct drm_plane *plane;
2483 struct drm_plane_state *old_plane_state, *new_plane_state;
2484 int i;
2485 bool active_only = flags & DRM_PLANE_COMMIT_ACTIVE_ONLY;
2486 bool no_disable = flags & DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET;
2487
2488 for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
2489 const struct drm_crtc_helper_funcs *funcs;
2490
2491 funcs = crtc->helper_private;
2492
2493 if (!funcs || !funcs->atomic_begin)
2494 continue;
2495
2496 if (active_only && !new_crtc_state->active)
2497 continue;
2498
2499 funcs->atomic_begin(crtc, old_state);
2500 }
2501
2502 for_each_oldnew_plane_in_state(old_state, plane, old_plane_state, new_plane_state, i) {
2503 const struct drm_plane_helper_funcs *funcs;
2504 bool disabling;
2505
2506 funcs = plane->helper_private;
2507
2508 if (!funcs)
2509 continue;
2510
2511 disabling = drm_atomic_plane_disabling(old_plane_state,
2512 new_plane_state);
2513
2514 if (active_only) {
2515 /*
2516 * Skip planes related to inactive CRTCs. If the plane
2517 * is enabled use the state of the current CRTC. If the
2518 * plane is being disabled use the state of the old
2519 * CRTC to avoid skipping planes being disabled on an
2520 * active CRTC.
2521 */
2522 if (!disabling && !plane_crtc_active(new_plane_state))
2523 continue;
2524 if (disabling && !plane_crtc_active(old_plane_state))
2525 continue;
2526 }
2527
2528 /*
2529 * Special-case disabling the plane if drivers support it.
2530 */
2531 if (disabling && funcs->atomic_disable) {
2532 struct drm_crtc_state *crtc_state;
2533
2534 crtc_state = old_plane_state->crtc->state;
2535
2536 if (drm_atomic_crtc_needs_modeset(crtc_state) &&
2537 no_disable)
2538 continue;
2539
2540 funcs->atomic_disable(plane, old_state);
2541 } else if (new_plane_state->crtc || disabling) {
2542 funcs->atomic_update(plane, old_state);
2543 }
2544 }
2545
2546 for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
2547 const struct drm_crtc_helper_funcs *funcs;
2548
2549 funcs = crtc->helper_private;
2550
2551 if (!funcs || !funcs->atomic_flush)
2552 continue;
2553
2554 if (active_only && !new_crtc_state->active)
2555 continue;
2556
2557 funcs->atomic_flush(crtc, old_state);
2558 }
2559}
2560EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
2561
2562/**
2563 * drm_atomic_helper_commit_planes_on_crtc - commit plane state for a CRTC
2564 * @old_crtc_state: atomic state object with the old CRTC state
2565 *
2566 * This function commits the new plane state using the plane and atomic helper
2567 * functions for planes on the specific CRTC. It assumes that the atomic state
2568 * has already been pushed into the relevant object state pointers, since this
2569 * step can no longer fail.
2570 *
2571 * This function is useful when plane updates should be done CRTC-by-CRTC
2572 * instead of one global step like drm_atomic_helper_commit_planes() does.
2573 *
2574 * This function can only be savely used when planes are not allowed to move
2575 * between different CRTCs because this function doesn't handle inter-CRTC
2576 * depencies. Callers need to ensure that either no such depencies exist,
2577 * resolve them through ordering of commit calls or through some other means.
2578 */
2579void
2580drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state)
2581{
2582 const struct drm_crtc_helper_funcs *crtc_funcs;
2583 struct drm_crtc *crtc = old_crtc_state->crtc;
2584 struct drm_atomic_state *old_state = old_crtc_state->state;
2585 struct drm_crtc_state *new_crtc_state =
2586 drm_atomic_get_new_crtc_state(old_state, crtc);
2587 struct drm_plane *plane;
2588 unsigned int plane_mask;
2589
2590 plane_mask = old_crtc_state->plane_mask;
2591 plane_mask |= new_crtc_state->plane_mask;
2592
2593 crtc_funcs = crtc->helper_private;
2594 if (crtc_funcs && crtc_funcs->atomic_begin)
2595 crtc_funcs->atomic_begin(crtc, old_state);
2596
2597 drm_for_each_plane_mask(plane, crtc->dev, plane_mask) {
2598 struct drm_plane_state *old_plane_state =
2599 drm_atomic_get_old_plane_state(old_state, plane);
2600 struct drm_plane_state *new_plane_state =
2601 drm_atomic_get_new_plane_state(old_state, plane);
2602 const struct drm_plane_helper_funcs *plane_funcs;
2603
2604 plane_funcs = plane->helper_private;
2605
2606 if (!old_plane_state || !plane_funcs)
2607 continue;
2608
2609 WARN_ON(new_plane_state->crtc &&
2610 new_plane_state->crtc != crtc);
2611
2612 if (drm_atomic_plane_disabling(old_plane_state, new_plane_state) &&
2613 plane_funcs->atomic_disable)
2614 plane_funcs->atomic_disable(plane, old_state);
2615 else if (new_plane_state->crtc ||
2616 drm_atomic_plane_disabling(old_plane_state, new_plane_state))
2617 plane_funcs->atomic_update(plane, old_state);
2618 }
2619
2620 if (crtc_funcs && crtc_funcs->atomic_flush)
2621 crtc_funcs->atomic_flush(crtc, old_state);
2622}
2623EXPORT_SYMBOL(drm_atomic_helper_commit_planes_on_crtc);
2624
2625/**
2626 * drm_atomic_helper_disable_planes_on_crtc - helper to disable CRTC's planes
2627 * @old_crtc_state: atomic state object with the old CRTC state
2628 * @atomic: if set, synchronize with CRTC's atomic_begin/flush hooks
2629 *
2630 * Disables all planes associated with the given CRTC. This can be
2631 * used for instance in the CRTC helper atomic_disable callback to disable
2632 * all planes.
2633 *
2634 * If the atomic-parameter is set the function calls the CRTC's
2635 * atomic_begin hook before and atomic_flush hook after disabling the
2636 * planes.
2637 *
2638 * It is a bug to call this function without having implemented the
2639 * &drm_plane_helper_funcs.atomic_disable plane hook.
2640 */
2641void
2642drm_atomic_helper_disable_planes_on_crtc(struct drm_crtc_state *old_crtc_state,
2643 bool atomic)
2644{
2645 struct drm_crtc *crtc = old_crtc_state->crtc;
2646 const struct drm_crtc_helper_funcs *crtc_funcs =
2647 crtc->helper_private;
2648 struct drm_plane *plane;
2649
2650 if (atomic && crtc_funcs && crtc_funcs->atomic_begin)
2651 crtc_funcs->atomic_begin(crtc, NULL);
2652
2653 drm_atomic_crtc_state_for_each_plane(plane, old_crtc_state) {
2654 const struct drm_plane_helper_funcs *plane_funcs =
2655 plane->helper_private;
2656
2657 if (!plane_funcs)
2658 continue;
2659
2660 WARN_ON(!plane_funcs->atomic_disable);
2661 if (plane_funcs->atomic_disable)
2662 plane_funcs->atomic_disable(plane, NULL);
2663 }
2664
2665 if (atomic && crtc_funcs && crtc_funcs->atomic_flush)
2666 crtc_funcs->atomic_flush(crtc, NULL);
2667}
2668EXPORT_SYMBOL(drm_atomic_helper_disable_planes_on_crtc);
2669
2670/**
2671 * drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
2672 * @dev: DRM device
2673 * @old_state: atomic state object with old state structures
2674 *
2675 * This function cleans up plane state, specifically framebuffers, from the old
2676 * configuration. Hence the old configuration must be perserved in @old_state to
2677 * be able to call this function.
2678 *
2679 * This function must also be called on the new state when the atomic update
2680 * fails at any point after calling drm_atomic_helper_prepare_planes().
2681 */
2682void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
2683 struct drm_atomic_state *old_state)
2684{
2685 struct drm_plane *plane;
2686 struct drm_plane_state *old_plane_state, *new_plane_state;
2687 int i;
2688
2689 for_each_oldnew_plane_in_state(old_state, plane, old_plane_state, new_plane_state, i) {
2690 const struct drm_plane_helper_funcs *funcs;
2691 struct drm_plane_state *plane_state;
2692
2693 /*
2694 * This might be called before swapping when commit is aborted,
2695 * in which case we have to cleanup the new state.
2696 */
2697 if (old_plane_state == plane->state)
2698 plane_state = new_plane_state;
2699 else
2700 plane_state = old_plane_state;
2701
2702 funcs = plane->helper_private;
2703
2704 if (funcs->cleanup_fb)
2705 funcs->cleanup_fb(plane, plane_state);
2706 }
2707}
2708EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
2709
2710/**
2711 * drm_atomic_helper_swap_state - store atomic state into current sw state
2712 * @state: atomic state
2713 * @stall: stall for preceeding commits
2714 *
2715 * This function stores the atomic state into the current state pointers in all
2716 * driver objects. It should be called after all failing steps have been done
2717 * and succeeded, but before the actual hardware state is committed.
2718 *
2719 * For cleanup and error recovery the current state for all changed objects will
2720 * be swapped into @state.
2721 *
2722 * With that sequence it fits perfectly into the plane prepare/cleanup sequence:
2723 *
2724 * 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state.
2725 *
2726 * 2. Do any other steps that might fail.
2727 *
2728 * 3. Put the staged state into the current state pointers with this function.
2729 *
2730 * 4. Actually commit the hardware state.
2731 *
2732 * 5. Call drm_atomic_helper_cleanup_planes() with @state, which since step 3
2733 * contains the old state. Also do any other cleanup required with that state.
2734 *
2735 * @stall must be set when nonblocking commits for this driver directly access
2736 * the &drm_plane.state, &drm_crtc.state or &drm_connector.state pointer. With
2737 * the current atomic helpers this is almost always the case, since the helpers
2738 * don't pass the right state structures to the callbacks.
2739 *
2740 * Returns:
2741 *
2742 * Returns 0 on success. Can return -ERESTARTSYS when @stall is true and the
2743 * waiting for the previous commits has been interrupted.
2744 */
2745int drm_atomic_helper_swap_state(struct drm_atomic_state *state,
2746 bool stall)
2747{
2748 int i, ret;
2749 struct drm_connector *connector;
2750 struct drm_connector_state *old_conn_state, *new_conn_state;
2751 struct drm_crtc *crtc;
2752 struct drm_crtc_state *old_crtc_state, *new_crtc_state;
2753 struct drm_plane *plane;
2754 struct drm_plane_state *old_plane_state, *new_plane_state;
2755 struct drm_crtc_commit *commit;
2756 struct drm_private_obj *obj;
2757 struct drm_private_state *old_obj_state, *new_obj_state;
2758
2759 if (stall) {
2760 /*
2761 * We have to stall for hw_done here before
2762 * drm_atomic_helper_wait_for_dependencies() because flip
2763 * depth > 1 is not yet supported by all drivers. As long as
2764 * obj->state is directly dereferenced anywhere in the drivers
2765 * atomic_commit_tail function, then it's unsafe to swap state
2766 * before drm_atomic_helper_commit_hw_done() is called.
2767 */
2768
2769 for_each_old_crtc_in_state(state, crtc, old_crtc_state, i) {
2770 commit = old_crtc_state->commit;
2771
2772 if (!commit)
2773 continue;
2774
2775 ret = wait_for_completion_interruptible(&commit->hw_done);
2776 if (ret)
2777 return ret;
2778 }
2779
2780 for_each_old_connector_in_state(state, connector, old_conn_state, i) {
2781 commit = old_conn_state->commit;
2782
2783 if (!commit)
2784 continue;
2785
2786 ret = wait_for_completion_interruptible(&commit->hw_done);
2787 if (ret)
2788 return ret;
2789 }
2790
2791 for_each_old_plane_in_state(state, plane, old_plane_state, i) {
2792 commit = old_plane_state->commit;
2793
2794 if (!commit)
2795 continue;
2796
2797 ret = wait_for_completion_interruptible(&commit->hw_done);
2798 if (ret)
2799 return ret;
2800 }
2801 }
2802
2803 for_each_oldnew_connector_in_state(state, connector, old_conn_state, new_conn_state, i) {
2804 WARN_ON(connector->state != old_conn_state);
2805
2806 old_conn_state->state = state;
2807 new_conn_state->state = NULL;
2808
2809 state->connectors[i].state = old_conn_state;
2810 connector->state = new_conn_state;
2811 }
2812
2813 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
2814 WARN_ON(crtc->state != old_crtc_state);
2815
2816 old_crtc_state->state = state;
2817 new_crtc_state->state = NULL;
2818
2819 state->crtcs[i].state = old_crtc_state;
2820 crtc->state = new_crtc_state;
2821
2822 if (new_crtc_state->commit) {
2823 spin_lock(&crtc->commit_lock);
2824 list_add(&new_crtc_state->commit->commit_entry,
2825 &crtc->commit_list);
2826 spin_unlock(&crtc->commit_lock);
2827
2828 new_crtc_state->commit->event = NULL;
2829 }
2830 }
2831
2832 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
2833 WARN_ON(plane->state != old_plane_state);
2834
2835 old_plane_state->state = state;
2836 new_plane_state->state = NULL;
2837
2838 state->planes[i].state = old_plane_state;
2839 plane->state = new_plane_state;
2840 }
2841
2842 for_each_oldnew_private_obj_in_state(state, obj, old_obj_state, new_obj_state, i) {
2843 WARN_ON(obj->state != old_obj_state);
2844
2845 old_obj_state->state = state;
2846 new_obj_state->state = NULL;
2847
2848 state->private_objs[i].state = old_obj_state;
2849 obj->state = new_obj_state;
2850 }
2851
2852 return 0;
2853}
2854EXPORT_SYMBOL(drm_atomic_helper_swap_state);
2855
2856/**
2857 * drm_atomic_helper_update_plane - Helper for primary plane update using atomic
2858 * @plane: plane object to update
2859 * @crtc: owning CRTC of owning plane
2860 * @fb: framebuffer to flip onto plane
2861 * @crtc_x: x offset of primary plane on @crtc
2862 * @crtc_y: y offset of primary plane on @crtc
2863 * @crtc_w: width of primary plane rectangle on @crtc
2864 * @crtc_h: height of primary plane rectangle on @crtc
2865 * @src_x: x offset of @fb for panning
2866 * @src_y: y offset of @fb for panning
2867 * @src_w: width of source rectangle in @fb
2868 * @src_h: height of source rectangle in @fb
2869 * @ctx: lock acquire context
2870 *
2871 * Provides a default plane update handler using the atomic driver interface.
2872 *
2873 * RETURNS:
2874 * Zero on success, error code on failure
2875 */
2876int drm_atomic_helper_update_plane(struct drm_plane *plane,
2877 struct drm_crtc *crtc,
2878 struct drm_framebuffer *fb,
2879 int crtc_x, int crtc_y,
2880 unsigned int crtc_w, unsigned int crtc_h,
2881 uint32_t src_x, uint32_t src_y,
2882 uint32_t src_w, uint32_t src_h,
2883 struct drm_modeset_acquire_ctx *ctx)
2884{
2885 struct drm_atomic_state *state;
2886 struct drm_plane_state *plane_state;
2887 int ret = 0;
2888
2889 state = drm_atomic_state_alloc(plane->dev);
2890 if (!state)
2891 return -ENOMEM;
2892
2893 state->acquire_ctx = ctx;
2894 plane_state = drm_atomic_get_plane_state(state, plane);
2895 if (IS_ERR(plane_state)) {
2896 ret = PTR_ERR(plane_state);
2897 goto fail;
2898 }
2899
2900 ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
2901 if (ret != 0)
2902 goto fail;
2903 drm_atomic_set_fb_for_plane(plane_state, fb);
2904 plane_state->crtc_x = crtc_x;
2905 plane_state->crtc_y = crtc_y;
2906 plane_state->crtc_w = crtc_w;
2907 plane_state->crtc_h = crtc_h;
2908 plane_state->src_x = src_x;
2909 plane_state->src_y = src_y;
2910 plane_state->src_w = src_w;
2911 plane_state->src_h = src_h;
2912
2913 if (plane == crtc->cursor)
2914 state->legacy_cursor_update = true;
2915
2916 ret = drm_atomic_commit(state);
2917fail:
2918 drm_atomic_state_put(state);
2919 return ret;
2920}
2921EXPORT_SYMBOL(drm_atomic_helper_update_plane);
2922
2923/**
2924 * drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic
2925 * @plane: plane to disable
2926 * @ctx: lock acquire context
2927 *
2928 * Provides a default plane disable handler using the atomic driver interface.
2929 *
2930 * RETURNS:
2931 * Zero on success, error code on failure
2932 */
2933int drm_atomic_helper_disable_plane(struct drm_plane *plane,
2934 struct drm_modeset_acquire_ctx *ctx)
2935{
2936 struct drm_atomic_state *state;
2937 struct drm_plane_state *plane_state;
2938 int ret = 0;
2939
2940 state = drm_atomic_state_alloc(plane->dev);
2941 if (!state)
2942 return -ENOMEM;
2943
2944 state->acquire_ctx = ctx;
2945 plane_state = drm_atomic_get_plane_state(state, plane);
2946 if (IS_ERR(plane_state)) {
2947 ret = PTR_ERR(plane_state);
2948 goto fail;
2949 }
2950
2951 if (plane_state->crtc && plane_state->crtc->cursor == plane)
2952 plane_state->state->legacy_cursor_update = true;
2953
2954 ret = __drm_atomic_helper_disable_plane(plane, plane_state);
2955 if (ret != 0)
2956 goto fail;
2957
2958 ret = drm_atomic_commit(state);
2959fail:
2960 drm_atomic_state_put(state);
2961 return ret;
2962}
2963EXPORT_SYMBOL(drm_atomic_helper_disable_plane);
2964
2965/**
2966 * drm_atomic_helper_set_config - set a new config from userspace
2967 * @set: mode set configuration
2968 * @ctx: lock acquisition context
2969 *
2970 * Provides a default CRTC set_config handler using the atomic driver interface.
2971 *
2972 * NOTE: For backwards compatibility with old userspace this automatically
2973 * resets the "link-status" property to GOOD, to force any link
2974 * re-training. The SETCRTC ioctl does not define whether an update does
2975 * need a full modeset or just a plane update, hence we're allowed to do
2976 * that. See also drm_connector_set_link_status_property().
2977 *
2978 * Returns:
2979 * Returns 0 on success, negative errno numbers on failure.
2980 */
2981int drm_atomic_helper_set_config(struct drm_mode_set *set,
2982 struct drm_modeset_acquire_ctx *ctx)
2983{
2984 struct drm_atomic_state *state;
2985 struct drm_crtc *crtc = set->crtc;
2986 int ret = 0;
2987
2988 state = drm_atomic_state_alloc(crtc->dev);
2989 if (!state)
2990 return -ENOMEM;
2991
2992 state->acquire_ctx = ctx;
2993 ret = __drm_atomic_helper_set_config(set, state);
2994 if (ret != 0)
2995 goto fail;
2996
2997 ret = handle_conflicting_encoders(state, true);
2998 if (ret)
2999 goto fail;
3000
3001 ret = drm_atomic_commit(state);
3002
3003fail:
3004 drm_atomic_state_put(state);
3005 return ret;
3006}
3007EXPORT_SYMBOL(drm_atomic_helper_set_config);
3008
3009/**
3010 * drm_atomic_helper_disable_all - disable all currently active outputs
3011 * @dev: DRM device
3012 * @ctx: lock acquisition context
3013 *
3014 * Loops through all connectors, finding those that aren't turned off and then
3015 * turns them off by setting their DPMS mode to OFF and deactivating the CRTC
3016 * that they are connected to.
3017 *
3018 * This is used for example in suspend/resume to disable all currently active
3019 * functions when suspending. If you just want to shut down everything at e.g.
3020 * driver unload, look at drm_atomic_helper_shutdown().
3021 *
3022 * Note that if callers haven't already acquired all modeset locks this might
3023 * return -EDEADLK, which must be handled by calling drm_modeset_backoff().
3024 *
3025 * Returns:
3026 * 0 on success or a negative error code on failure.
3027 *
3028 * See also:
3029 * drm_atomic_helper_suspend(), drm_atomic_helper_resume() and
3030 * drm_atomic_helper_shutdown().
3031 */
3032int drm_atomic_helper_disable_all(struct drm_device *dev,
3033 struct drm_modeset_acquire_ctx *ctx)
3034{
3035 struct drm_atomic_state *state;
3036 struct drm_connector_state *conn_state;
3037 struct drm_connector *conn;
3038 struct drm_plane_state *plane_state;
3039 struct drm_plane *plane;
3040 struct drm_crtc_state *crtc_state;
3041 struct drm_crtc *crtc;
3042 int ret, i;
3043
3044 state = drm_atomic_state_alloc(dev);
3045 if (!state)
3046 return -ENOMEM;
3047
3048 state->acquire_ctx = ctx;
3049
3050 drm_for_each_crtc(crtc, dev) {
3051 crtc_state = drm_atomic_get_crtc_state(state, crtc);
3052 if (IS_ERR(crtc_state)) {
3053 ret = PTR_ERR(crtc_state);
3054 goto free;
3055 }
3056
3057 crtc_state->active = false;
3058
3059 ret = drm_atomic_set_mode_prop_for_crtc(crtc_state, NULL);
3060 if (ret < 0)
3061 goto free;
3062
3063 ret = drm_atomic_add_affected_planes(state, crtc);
3064 if (ret < 0)
3065 goto free;
3066
3067 ret = drm_atomic_add_affected_connectors(state, crtc);
3068 if (ret < 0)
3069 goto free;
3070 }
3071
3072 for_each_new_connector_in_state(state, conn, conn_state, i) {
3073 ret = drm_atomic_set_crtc_for_connector(conn_state, NULL);
3074 if (ret < 0)
3075 goto free;
3076 }
3077
3078 for_each_new_plane_in_state(state, plane, plane_state, i) {
3079 ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
3080 if (ret < 0)
3081 goto free;
3082
3083 drm_atomic_set_fb_for_plane(plane_state, NULL);
3084 }
3085
3086 ret = drm_atomic_commit(state);
3087free:
3088 drm_atomic_state_put(state);
3089 return ret;
3090}
3091EXPORT_SYMBOL(drm_atomic_helper_disable_all);
3092
3093/**
3094 * drm_atomic_helper_shutdown - shutdown all CRTC
3095 * @dev: DRM device
3096 *
3097 * This shuts down all CRTC, which is useful for driver unloading. Shutdown on
3098 * suspend should instead be handled with drm_atomic_helper_suspend(), since
3099 * that also takes a snapshot of the modeset state to be restored on resume.
3100 *
3101 * This is just a convenience wrapper around drm_atomic_helper_disable_all(),
3102 * and it is the atomic version of drm_crtc_force_disable_all().
3103 */
3104void drm_atomic_helper_shutdown(struct drm_device *dev)
3105{
3106 struct drm_modeset_acquire_ctx ctx;
3107 int ret;
3108
3109 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
3110
3111 ret = drm_atomic_helper_disable_all(dev, &ctx);
3112 if (ret)
3113 DRM_ERROR("Disabling all crtc's during unload failed with %i\n", ret);
3114
3115 DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
3116}
3117EXPORT_SYMBOL(drm_atomic_helper_shutdown);
3118
3119/**
3120 * drm_atomic_helper_duplicate_state - duplicate an atomic state object
3121 * @dev: DRM device
3122 * @ctx: lock acquisition context
3123 *
3124 * Makes a copy of the current atomic state by looping over all objects and
3125 * duplicating their respective states. This is used for example by suspend/
3126 * resume support code to save the state prior to suspend such that it can
3127 * be restored upon resume.
3128 *
3129 * Note that this treats atomic state as persistent between save and restore.
3130 * Drivers must make sure that this is possible and won't result in confusion
3131 * or erroneous behaviour.
3132 *
3133 * Note that if callers haven't already acquired all modeset locks this might
3134 * return -EDEADLK, which must be handled by calling drm_modeset_backoff().
3135 *
3136 * Returns:
3137 * A pointer to the copy of the atomic state object on success or an
3138 * ERR_PTR()-encoded error code on failure.
3139 *
3140 * See also:
3141 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
3142 */
3143struct drm_atomic_state *
3144drm_atomic_helper_duplicate_state(struct drm_device *dev,
3145 struct drm_modeset_acquire_ctx *ctx)
3146{
3147 struct drm_atomic_state *state;
3148 struct drm_connector *conn;
3149 struct drm_connector_list_iter conn_iter;
3150 struct drm_plane *plane;
3151 struct drm_crtc *crtc;
3152 int err = 0;
3153
3154 state = drm_atomic_state_alloc(dev);
3155 if (!state)
3156 return ERR_PTR(-ENOMEM);
3157
3158 state->acquire_ctx = ctx;
3159 state->duplicated = true;
3160
3161 drm_for_each_crtc(crtc, dev) {
3162 struct drm_crtc_state *crtc_state;
3163
3164 crtc_state = drm_atomic_get_crtc_state(state, crtc);
3165 if (IS_ERR(crtc_state)) {
3166 err = PTR_ERR(crtc_state);
3167 goto free;
3168 }
3169 }
3170
3171 drm_for_each_plane(plane, dev) {
3172 struct drm_plane_state *plane_state;
3173
3174 plane_state = drm_atomic_get_plane_state(state, plane);
3175 if (IS_ERR(plane_state)) {
3176 err = PTR_ERR(plane_state);
3177 goto free;
3178 }
3179 }
3180
3181 drm_connector_list_iter_begin(dev, &conn_iter);
3182 drm_for_each_connector_iter(conn, &conn_iter) {
3183 struct drm_connector_state *conn_state;
3184
3185 conn_state = drm_atomic_get_connector_state(state, conn);
3186 if (IS_ERR(conn_state)) {
3187 err = PTR_ERR(conn_state);
3188 drm_connector_list_iter_end(&conn_iter);
3189 goto free;
3190 }
3191 }
3192 drm_connector_list_iter_end(&conn_iter);
3193
3194 /* clear the acquire context so that it isn't accidentally reused */
3195 state->acquire_ctx = NULL;
3196
3197free:
3198 if (err < 0) {
3199 drm_atomic_state_put(state);
3200 state = ERR_PTR(err);
3201 }
3202
3203 return state;
3204}
3205EXPORT_SYMBOL(drm_atomic_helper_duplicate_state);
3206
3207/**
3208 * drm_atomic_helper_suspend - subsystem-level suspend helper
3209 * @dev: DRM device
3210 *
3211 * Duplicates the current atomic state, disables all active outputs and then
3212 * returns a pointer to the original atomic state to the caller. Drivers can
3213 * pass this pointer to the drm_atomic_helper_resume() helper upon resume to
3214 * restore the output configuration that was active at the time the system
3215 * entered suspend.
3216 *
3217 * Note that it is potentially unsafe to use this. The atomic state object
3218 * returned by this function is assumed to be persistent. Drivers must ensure
3219 * that this holds true. Before calling this function, drivers must make sure
3220 * to suspend fbdev emulation so that nothing can be using the device.
3221 *
3222 * Returns:
3223 * A pointer to a copy of the state before suspend on success or an ERR_PTR()-
3224 * encoded error code on failure. Drivers should store the returned atomic
3225 * state object and pass it to the drm_atomic_helper_resume() helper upon
3226 * resume.
3227 *
3228 * See also:
3229 * drm_atomic_helper_duplicate_state(), drm_atomic_helper_disable_all(),
3230 * drm_atomic_helper_resume(), drm_atomic_helper_commit_duplicated_state()
3231 */
3232struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev)
3233{
3234 struct drm_modeset_acquire_ctx ctx;
3235 struct drm_atomic_state *state;
3236 int err;
3237
3238 /* This can never be returned, but it makes the compiler happy */
3239 state = ERR_PTR(-EINVAL);
3240
3241 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, err);
3242
3243 state = drm_atomic_helper_duplicate_state(dev, &ctx);
3244 if (IS_ERR(state))
3245 goto unlock;
3246
3247 err = drm_atomic_helper_disable_all(dev, &ctx);
3248 if (err < 0) {
3249 drm_atomic_state_put(state);
3250 state = ERR_PTR(err);
3251 goto unlock;
3252 }
3253
3254unlock:
3255 DRM_MODESET_LOCK_ALL_END(dev, ctx, err);
3256 if (err)
3257 return ERR_PTR(err);
3258
3259 return state;
3260}
3261EXPORT_SYMBOL(drm_atomic_helper_suspend);
3262
3263/**
3264 * drm_atomic_helper_commit_duplicated_state - commit duplicated state
3265 * @state: duplicated atomic state to commit
3266 * @ctx: pointer to acquire_ctx to use for commit.
3267 *
3268 * The state returned by drm_atomic_helper_duplicate_state() and
3269 * drm_atomic_helper_suspend() is partially invalid, and needs to
3270 * be fixed up before commit.
3271 *
3272 * Returns:
3273 * 0 on success or a negative error code on failure.
3274 *
3275 * See also:
3276 * drm_atomic_helper_suspend()
3277 */
3278int drm_atomic_helper_commit_duplicated_state(struct drm_atomic_state *state,
3279 struct drm_modeset_acquire_ctx *ctx)
3280{
3281 int i, ret;
3282 struct drm_plane *plane;
3283 struct drm_plane_state *new_plane_state;
3284 struct drm_connector *connector;
3285 struct drm_connector_state *new_conn_state;
3286 struct drm_crtc *crtc;
3287 struct drm_crtc_state *new_crtc_state;
3288
3289 state->acquire_ctx = ctx;
3290
3291 for_each_new_plane_in_state(state, plane, new_plane_state, i)
3292 state->planes[i].old_state = plane->state;
3293
3294 for_each_new_crtc_in_state(state, crtc, new_crtc_state, i)
3295 state->crtcs[i].old_state = crtc->state;
3296
3297 for_each_new_connector_in_state(state, connector, new_conn_state, i)
3298 state->connectors[i].old_state = connector->state;
3299
3300 ret = drm_atomic_commit(state);
3301
3302 state->acquire_ctx = NULL;
3303
3304 return ret;
3305}
3306EXPORT_SYMBOL(drm_atomic_helper_commit_duplicated_state);
3307
3308/**
3309 * drm_atomic_helper_resume - subsystem-level resume helper
3310 * @dev: DRM device
3311 * @state: atomic state to resume to
3312 *
3313 * Calls drm_mode_config_reset() to synchronize hardware and software states,
3314 * grabs all modeset locks and commits the atomic state object. This can be
3315 * used in conjunction with the drm_atomic_helper_suspend() helper to
3316 * implement suspend/resume for drivers that support atomic mode-setting.
3317 *
3318 * Returns:
3319 * 0 on success or a negative error code on failure.
3320 *
3321 * See also:
3322 * drm_atomic_helper_suspend()
3323 */
3324int drm_atomic_helper_resume(struct drm_device *dev,
3325 struct drm_atomic_state *state)
3326{
3327 struct drm_modeset_acquire_ctx ctx;
3328 int err;
3329
3330 drm_mode_config_reset(dev);
3331
3332 DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, err);
3333
3334 err = drm_atomic_helper_commit_duplicated_state(state, &ctx);
3335
3336 DRM_MODESET_LOCK_ALL_END(dev, ctx, err);
3337 drm_atomic_state_put(state);
3338
3339 return err;
3340}
3341EXPORT_SYMBOL(drm_atomic_helper_resume);
3342
3343static int page_flip_common(struct drm_atomic_state *state,
3344 struct drm_crtc *crtc,
3345 struct drm_framebuffer *fb,
3346 struct drm_pending_vblank_event *event,
3347 uint32_t flags)
3348{
3349 struct drm_plane *plane = crtc->primary;
3350 struct drm_plane_state *plane_state;
3351 struct drm_crtc_state *crtc_state;
3352 int ret = 0;
3353
3354 crtc_state = drm_atomic_get_crtc_state(state, crtc);
3355 if (IS_ERR(crtc_state))
3356 return PTR_ERR(crtc_state);
3357
3358 crtc_state->event = event;
3359 crtc_state->async_flip = flags & DRM_MODE_PAGE_FLIP_ASYNC;
3360
3361 plane_state = drm_atomic_get_plane_state(state, plane);
3362 if (IS_ERR(plane_state))
3363 return PTR_ERR(plane_state);
3364
3365 ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
3366 if (ret != 0)
3367 return ret;
3368 drm_atomic_set_fb_for_plane(plane_state, fb);
3369
3370 /* Make sure we don't accidentally do a full modeset. */
3371 state->allow_modeset = false;
3372 if (!crtc_state->active) {
3373 DRM_DEBUG_ATOMIC("[CRTC:%d:%s] disabled, rejecting legacy flip\n",
3374 crtc->base.id, crtc->name);
3375 return -EINVAL;
3376 }
3377
3378 return ret;
3379}
3380
3381/**
3382 * drm_atomic_helper_page_flip - execute a legacy page flip
3383 * @crtc: DRM CRTC
3384 * @fb: DRM framebuffer
3385 * @event: optional DRM event to signal upon completion
3386 * @flags: flip flags for non-vblank sync'ed updates
3387 * @ctx: lock acquisition context
3388 *
3389 * Provides a default &drm_crtc_funcs.page_flip implementation
3390 * using the atomic driver interface.
3391 *
3392 * Returns:
3393 * Returns 0 on success, negative errno numbers on failure.
3394 *
3395 * See also:
3396 * drm_atomic_helper_page_flip_target()
3397 */
3398int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
3399 struct drm_framebuffer *fb,
3400 struct drm_pending_vblank_event *event,
3401 uint32_t flags,
3402 struct drm_modeset_acquire_ctx *ctx)
3403{
3404 struct drm_plane *plane = crtc->primary;
3405 struct drm_atomic_state *state;
3406 int ret = 0;
3407
3408 state = drm_atomic_state_alloc(plane->dev);
3409 if (!state)
3410 return -ENOMEM;
3411
3412 state->acquire_ctx = ctx;
3413
3414 ret = page_flip_common(state, crtc, fb, event, flags);
3415 if (ret != 0)
3416 goto fail;
3417
3418 ret = drm_atomic_nonblocking_commit(state);
3419fail:
3420 drm_atomic_state_put(state);
3421 return ret;
3422}
3423EXPORT_SYMBOL(drm_atomic_helper_page_flip);
3424
3425/**
3426 * drm_atomic_helper_page_flip_target - do page flip on target vblank period.
3427 * @crtc: DRM CRTC
3428 * @fb: DRM framebuffer
3429 * @event: optional DRM event to signal upon completion
3430 * @flags: flip flags for non-vblank sync'ed updates
3431 * @target: specifying the target vblank period when the flip to take effect
3432 * @ctx: lock acquisition context
3433 *
3434 * Provides a default &drm_crtc_funcs.page_flip_target implementation.
3435 * Similar to drm_atomic_helper_page_flip() with extra parameter to specify
3436 * target vblank period to flip.
3437 *
3438 * Returns:
3439 * Returns 0 on success, negative errno numbers on failure.
3440 */
3441int drm_atomic_helper_page_flip_target(struct drm_crtc *crtc,
3442 struct drm_framebuffer *fb,
3443 struct drm_pending_vblank_event *event,
3444 uint32_t flags,
3445 uint32_t target,
3446 struct drm_modeset_acquire_ctx *ctx)
3447{
3448 struct drm_plane *plane = crtc->primary;
3449 struct drm_atomic_state *state;
3450 struct drm_crtc_state *crtc_state;
3451 int ret = 0;
3452
3453 state = drm_atomic_state_alloc(plane->dev);
3454 if (!state)
3455 return -ENOMEM;
3456
3457 state->acquire_ctx = ctx;
3458
3459 ret = page_flip_common(state, crtc, fb, event, flags);
3460 if (ret != 0)
3461 goto fail;
3462
3463 crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
3464 if (WARN_ON(!crtc_state)) {
3465 ret = -EINVAL;
3466 goto fail;
3467 }
3468 crtc_state->target_vblank = target;
3469
3470 ret = drm_atomic_nonblocking_commit(state);
3471fail:
3472 drm_atomic_state_put(state);
3473 return ret;
3474}
3475EXPORT_SYMBOL(drm_atomic_helper_page_flip_target);
3476
3477/**
3478 * drm_atomic_helper_bridge_propagate_bus_fmt() - Propagate output format to
3479 * the input end of a bridge
3480 * @bridge: bridge control structure
3481 * @bridge_state: new bridge state
3482 * @crtc_state: new CRTC state
3483 * @conn_state: new connector state
3484 * @output_fmt: tested output bus format
3485 * @num_input_fmts: will contain the size of the returned array
3486 *
3487 * This helper is a pluggable implementation of the
3488 * &drm_bridge_funcs.atomic_get_input_bus_fmts operation for bridges that don't
3489 * modify the bus configuration between their input and their output. It
3490 * returns an array of input formats with a single element set to @output_fmt.
3491 *
3492 * RETURNS:
3493 * a valid format array of size @num_input_fmts, or NULL if the allocation
3494 * failed
3495 */
3496u32 *
3497drm_atomic_helper_bridge_propagate_bus_fmt(struct drm_bridge *bridge,
3498 struct drm_bridge_state *bridge_state,
3499 struct drm_crtc_state *crtc_state,
3500 struct drm_connector_state *conn_state,
3501 u32 output_fmt,
3502 unsigned int *num_input_fmts)
3503{
3504 u32 *input_fmts;
3505
3506 input_fmts = kzalloc(sizeof(*input_fmts), GFP_KERNEL);
3507 if (!input_fmts) {
3508 *num_input_fmts = 0;
3509 return NULL;
3510 }
3511
3512 *num_input_fmts = 1;
3513 input_fmts[0] = output_fmt;
3514 return input_fmts;
3515}
3516EXPORT_SYMBOL(drm_atomic_helper_bridge_propagate_bus_fmt);