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1/*
2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
4 *
5 * DRM core CRTC related functions
6 *
7 * Permission to use, copy, modify, distribute, and sell this software and its
8 * documentation for any purpose is hereby granted without fee, provided that
9 * the above copyright notice appear in all copies and that both that copyright
10 * notice and this permission notice appear in supporting documentation, and
11 * that the name of the copyright holders not be used in advertising or
12 * publicity pertaining to distribution of the software without specific,
13 * written prior permission. The copyright holders make no representations
14 * about the suitability of this software for any purpose. It is provided "as
15 * is" without express or implied warranty.
16 *
17 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
19 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
21 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
22 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 * OF THIS SOFTWARE.
24 *
25 * Authors:
26 * Keith Packard
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
30 */
31
32#include <linux/export.h>
33#include <linux/kernel.h>
34#include <linux/moduleparam.h>
35#include <linux/dynamic_debug.h>
36
37#include <drm/drm_atomic.h>
38#include <drm/drm_atomic_helper.h>
39#include <drm/drm_atomic_uapi.h>
40#include <drm/drm_bridge.h>
41#include <drm/drm_crtc.h>
42#include <drm/drm_crtc_helper.h>
43#include <drm/drm_drv.h>
44#include <drm/drm_edid.h>
45#include <drm/drm_encoder.h>
46#include <drm/drm_fourcc.h>
47#include <drm/drm_framebuffer.h>
48#include <drm/drm_print.h>
49#include <drm/drm_vblank.h>
50
51#include "drm_crtc_helper_internal.h"
52
53DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
54 "DRM_UT_CORE",
55 "DRM_UT_DRIVER",
56 "DRM_UT_KMS",
57 "DRM_UT_PRIME",
58 "DRM_UT_ATOMIC",
59 "DRM_UT_VBL",
60 "DRM_UT_STATE",
61 "DRM_UT_LEASE",
62 "DRM_UT_DP",
63 "DRM_UT_DRMRES");
64
65/**
66 * DOC: overview
67 *
68 * The CRTC modeset helper library provides a default set_config implementation
69 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
70 * the same callbacks which drivers can use to e.g. restore the modeset
71 * configuration on resume with drm_helper_resume_force_mode().
72 *
73 * Note that this helper library doesn't track the current power state of CRTCs
74 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even
75 * though the hardware is already in the desired state. This deficiency has been
76 * fixed in the atomic helpers.
77 *
78 * The driver callbacks are mostly compatible with the atomic modeset helpers,
79 * except for the handling of the primary plane: Atomic helpers require that the
80 * primary plane is implemented as a real standalone plane and not directly tied
81 * to the CRTC state. For easier transition this library provides functions to
82 * implement the old semantics required by the CRTC helpers using the new plane
83 * and atomic helper callbacks.
84 *
85 * Drivers are strongly urged to convert to the atomic helpers (by way of first
86 * converting to the plane helpers). New drivers must not use these functions
87 * but need to implement the atomic interface instead, potentially using the
88 * atomic helpers for that.
89 *
90 * These legacy modeset helpers use the same function table structures as
91 * all other modesetting helpers. See the documentation for struct
92 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct
93 * &drm_connector_helper_funcs.
94 */
95
96/**
97 * drm_helper_encoder_in_use - check if a given encoder is in use
98 * @encoder: encoder to check
99 *
100 * Checks whether @encoder is with the current mode setting output configuration
101 * in use by any connector. This doesn't mean that it is actually enabled since
102 * the DPMS state is tracked separately.
103 *
104 * Returns:
105 * True if @encoder is used, false otherwise.
106 */
107bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
108{
109 struct drm_connector *connector;
110 struct drm_connector_list_iter conn_iter;
111 struct drm_device *dev = encoder->dev;
112
113 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
114
115 /*
116 * We can expect this mutex to be locked if we are not panicking.
117 * Locking is currently fubar in the panic handler.
118 */
119 if (!oops_in_progress) {
120 drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));
121 drm_WARN_ON(dev, !drm_modeset_is_locked(&dev->mode_config.connection_mutex));
122 }
123
124
125 drm_connector_list_iter_begin(dev, &conn_iter);
126 drm_for_each_connector_iter(connector, &conn_iter) {
127 if (connector->encoder == encoder) {
128 drm_connector_list_iter_end(&conn_iter);
129 return true;
130 }
131 }
132 drm_connector_list_iter_end(&conn_iter);
133 return false;
134}
135EXPORT_SYMBOL(drm_helper_encoder_in_use);
136
137/**
138 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
139 * @crtc: CRTC to check
140 *
141 * Checks whether @crtc is with the current mode setting output configuration
142 * in use by any connector. This doesn't mean that it is actually enabled since
143 * the DPMS state is tracked separately.
144 *
145 * Returns:
146 * True if @crtc is used, false otherwise.
147 */
148bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
149{
150 struct drm_encoder *encoder;
151 struct drm_device *dev = crtc->dev;
152
153 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
154
155 /*
156 * We can expect this mutex to be locked if we are not panicking.
157 * Locking is currently fubar in the panic handler.
158 */
159 if (!oops_in_progress)
160 drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));
161
162 drm_for_each_encoder(encoder, dev)
163 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
164 return true;
165 return false;
166}
167EXPORT_SYMBOL(drm_helper_crtc_in_use);
168
169static void
170drm_encoder_disable(struct drm_encoder *encoder)
171{
172 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
173
174 if (!encoder_funcs)
175 return;
176
177 if (encoder_funcs->disable)
178 (*encoder_funcs->disable)(encoder);
179 else if (encoder_funcs->dpms)
180 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
181}
182
183static void __drm_helper_disable_unused_functions(struct drm_device *dev)
184{
185 struct drm_encoder *encoder;
186 struct drm_crtc *crtc;
187
188 drm_warn_on_modeset_not_all_locked(dev);
189
190 drm_for_each_encoder(encoder, dev) {
191 if (!drm_helper_encoder_in_use(encoder)) {
192 drm_encoder_disable(encoder);
193 /* disconnect encoder from any connector */
194 encoder->crtc = NULL;
195 }
196 }
197
198 drm_for_each_crtc(crtc, dev) {
199 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
200
201 crtc->enabled = drm_helper_crtc_in_use(crtc);
202 if (!crtc->enabled) {
203 if (crtc_funcs->disable)
204 (*crtc_funcs->disable)(crtc);
205 else
206 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
207 crtc->primary->fb = NULL;
208 }
209 }
210}
211
212/**
213 * drm_helper_disable_unused_functions - disable unused objects
214 * @dev: DRM device
215 *
216 * This function walks through the entire mode setting configuration of @dev. It
217 * will remove any CRTC links of unused encoders and encoder links of
218 * disconnected connectors. Then it will disable all unused encoders and CRTCs
219 * either by calling their disable callback if available or by calling their
220 * dpms callback with DRM_MODE_DPMS_OFF.
221 *
222 * NOTE:
223 *
224 * This function is part of the legacy modeset helper library and will cause
225 * major confusion with atomic drivers. This is because atomic helpers guarantee
226 * to never call ->disable() hooks on a disabled function, or ->enable() hooks
227 * on an enabled functions. drm_helper_disable_unused_functions() on the other
228 * hand throws such guarantees into the wind and calls disable hooks
229 * unconditionally on unused functions.
230 */
231void drm_helper_disable_unused_functions(struct drm_device *dev)
232{
233 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
234
235 drm_modeset_lock_all(dev);
236 __drm_helper_disable_unused_functions(dev);
237 drm_modeset_unlock_all(dev);
238}
239EXPORT_SYMBOL(drm_helper_disable_unused_functions);
240
241/*
242 * Check the CRTC we're going to map each output to vs. its current
243 * CRTC. If they don't match, we have to disable the output and the CRTC
244 * since the driver will have to re-route things.
245 */
246static void
247drm_crtc_prepare_encoders(struct drm_device *dev)
248{
249 const struct drm_encoder_helper_funcs *encoder_funcs;
250 struct drm_encoder *encoder;
251
252 drm_for_each_encoder(encoder, dev) {
253 encoder_funcs = encoder->helper_private;
254 if (!encoder_funcs)
255 continue;
256
257 /* Disable unused encoders */
258 if (encoder->crtc == NULL)
259 drm_encoder_disable(encoder);
260 }
261}
262
263/**
264 * drm_crtc_helper_set_mode - internal helper to set a mode
265 * @crtc: CRTC to program
266 * @mode: mode to use
267 * @x: horizontal offset into the surface
268 * @y: vertical offset into the surface
269 * @old_fb: old framebuffer, for cleanup
270 *
271 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
272 * to fixup or reject the mode prior to trying to set it. This is an internal
273 * helper that drivers could e.g. use to update properties that require the
274 * entire output pipe to be disabled and re-enabled in a new configuration. For
275 * example for changing whether audio is enabled on a hdmi link or for changing
276 * panel fitter or dither attributes. It is also called by the
277 * drm_crtc_helper_set_config() helper function to drive the mode setting
278 * sequence.
279 *
280 * Returns:
281 * True if the mode was set successfully, false otherwise.
282 */
283bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
284 struct drm_display_mode *mode,
285 int x, int y,
286 struct drm_framebuffer *old_fb)
287{
288 struct drm_device *dev = crtc->dev;
289 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
290 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
291 const struct drm_encoder_helper_funcs *encoder_funcs;
292 int saved_x, saved_y;
293 bool saved_enabled;
294 struct drm_encoder *encoder;
295 bool ret = true;
296
297 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
298
299 drm_warn_on_modeset_not_all_locked(dev);
300
301 saved_enabled = crtc->enabled;
302 crtc->enabled = drm_helper_crtc_in_use(crtc);
303 if (!crtc->enabled)
304 return true;
305
306 adjusted_mode = drm_mode_duplicate(dev, mode);
307 if (!adjusted_mode) {
308 crtc->enabled = saved_enabled;
309 return false;
310 }
311
312 drm_mode_init(&saved_mode, &crtc->mode);
313 drm_mode_init(&saved_hwmode, &crtc->hwmode);
314 saved_x = crtc->x;
315 saved_y = crtc->y;
316
317 /* Update crtc values up front so the driver can rely on them for mode
318 * setting.
319 */
320 drm_mode_copy(&crtc->mode, mode);
321 crtc->x = x;
322 crtc->y = y;
323
324 /* Pass our mode to the connectors and the CRTC to give them a chance to
325 * adjust it according to limitations or connector properties, and also
326 * a chance to reject the mode entirely.
327 */
328 drm_for_each_encoder(encoder, dev) {
329
330 if (encoder->crtc != crtc)
331 continue;
332
333 encoder_funcs = encoder->helper_private;
334 if (!encoder_funcs)
335 continue;
336
337 encoder_funcs = encoder->helper_private;
338 if (encoder_funcs->mode_fixup) {
339 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
340 adjusted_mode))) {
341 drm_dbg_kms(dev, "[ENCODER:%d:%s] mode fixup failed\n",
342 encoder->base.id, encoder->name);
343 goto done;
344 }
345 }
346 }
347
348 if (crtc_funcs->mode_fixup) {
349 if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
350 adjusted_mode))) {
351 drm_dbg_kms(dev, "[CRTC:%d:%s] mode fixup failed\n",
352 crtc->base.id, crtc->name);
353 goto done;
354 }
355 }
356 drm_dbg_kms(dev, "[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
357
358 drm_mode_copy(&crtc->hwmode, adjusted_mode);
359
360 /* Prepare the encoders and CRTCs before setting the mode. */
361 drm_for_each_encoder(encoder, dev) {
362
363 if (encoder->crtc != crtc)
364 continue;
365
366 encoder_funcs = encoder->helper_private;
367 if (!encoder_funcs)
368 continue;
369
370 /* Disable the encoders as the first thing we do. */
371 if (encoder_funcs->prepare)
372 encoder_funcs->prepare(encoder);
373 }
374
375 drm_crtc_prepare_encoders(dev);
376
377 crtc_funcs->prepare(crtc);
378
379 /* Set up the DPLL and any encoders state that needs to adjust or depend
380 * on the DPLL.
381 */
382 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
383 if (!ret)
384 goto done;
385
386 drm_for_each_encoder(encoder, dev) {
387
388 if (encoder->crtc != crtc)
389 continue;
390
391 encoder_funcs = encoder->helper_private;
392 if (!encoder_funcs)
393 continue;
394
395 drm_dbg_kms(dev, "[ENCODER:%d:%s] set [MODE:%s]\n",
396 encoder->base.id, encoder->name, mode->name);
397 if (encoder_funcs->mode_set)
398 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
399 }
400
401 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
402 crtc_funcs->commit(crtc);
403
404 drm_for_each_encoder(encoder, dev) {
405
406 if (encoder->crtc != crtc)
407 continue;
408
409 encoder_funcs = encoder->helper_private;
410 if (!encoder_funcs)
411 continue;
412
413 if (encoder_funcs->commit)
414 encoder_funcs->commit(encoder);
415 }
416
417 /* Calculate and store various constants which
418 * are later needed by vblank and swap-completion
419 * timestamping. They are derived from true hwmode.
420 */
421 drm_calc_timestamping_constants(crtc, &crtc->hwmode);
422
423 /* FIXME: add subpixel order */
424done:
425 drm_mode_destroy(dev, adjusted_mode);
426 if (!ret) {
427 crtc->enabled = saved_enabled;
428 drm_mode_copy(&crtc->mode, &saved_mode);
429 drm_mode_copy(&crtc->hwmode, &saved_hwmode);
430 crtc->x = saved_x;
431 crtc->y = saved_y;
432 }
433
434 return ret;
435}
436EXPORT_SYMBOL(drm_crtc_helper_set_mode);
437
438/**
439 * drm_crtc_helper_atomic_check() - Helper to check CRTC atomic-state
440 * @crtc: CRTC to check
441 * @state: atomic state object
442 *
443 * Provides a default CRTC-state check handler for CRTCs that only have
444 * one primary plane attached to it. This is often the case for the CRTC
445 * of simple framebuffers.
446 *
447 * RETURNS:
448 * Zero on success, or an errno code otherwise.
449 */
450int drm_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)
451{
452 struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
453
454 if (!new_crtc_state->enable)
455 return 0;
456
457 return drm_atomic_helper_check_crtc_primary_plane(new_crtc_state);
458}
459EXPORT_SYMBOL(drm_crtc_helper_atomic_check);
460
461static void
462drm_crtc_helper_disable(struct drm_crtc *crtc)
463{
464 struct drm_device *dev = crtc->dev;
465 struct drm_connector *connector;
466 struct drm_encoder *encoder;
467
468 /* Decouple all encoders and their attached connectors from this crtc */
469 drm_for_each_encoder(encoder, dev) {
470 struct drm_connector_list_iter conn_iter;
471
472 if (encoder->crtc != crtc)
473 continue;
474
475 drm_connector_list_iter_begin(dev, &conn_iter);
476 drm_for_each_connector_iter(connector, &conn_iter) {
477 if (connector->encoder != encoder)
478 continue;
479
480 connector->encoder = NULL;
481
482 /*
483 * drm_helper_disable_unused_functions() ought to be
484 * doing this, but since we've decoupled the encoder
485 * from the connector above, the required connection
486 * between them is henceforth no longer available.
487 */
488 connector->dpms = DRM_MODE_DPMS_OFF;
489
490 /* we keep a reference while the encoder is bound */
491 drm_connector_put(connector);
492 }
493 drm_connector_list_iter_end(&conn_iter);
494 }
495
496 __drm_helper_disable_unused_functions(dev);
497}
498
499/*
500 * For connectors that support multiple encoders, either the
501 * .atomic_best_encoder() or .best_encoder() operation must be implemented.
502 */
503struct drm_encoder *
504drm_connector_get_single_encoder(struct drm_connector *connector)
505{
506 struct drm_encoder *encoder;
507
508 drm_WARN_ON(connector->dev, hweight32(connector->possible_encoders) > 1);
509 drm_connector_for_each_possible_encoder(connector, encoder)
510 return encoder;
511
512 return NULL;
513}
514
515/**
516 * drm_crtc_helper_set_config - set a new config from userspace
517 * @set: mode set configuration
518 * @ctx: lock acquire context, not used here
519 *
520 * The drm_crtc_helper_set_config() helper function implements the of
521 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
522 * helpers.
523 *
524 * It first tries to locate the best encoder for each connector by calling the
525 * connector @drm_connector_helper_funcs.best_encoder helper operation.
526 *
527 * After locating the appropriate encoders, the helper function will call the
528 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
529 * or reject it completely in which case an error will be returned to the
530 * application. If the new configuration after mode adjustment is identical to
531 * the current configuration the helper function will return without performing
532 * any other operation.
533 *
534 * If the adjusted mode is identical to the current mode but changes to the
535 * frame buffer need to be applied, the drm_crtc_helper_set_config() function
536 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
537 *
538 * If the adjusted mode differs from the current mode, or if the
539 * ->mode_set_base() helper operation is not provided, the helper function
540 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
541 * and ->commit() CRTC and encoder helper operations, in that order.
542 * Alternatively it can also use the dpms and disable helper operations. For
543 * details see &struct drm_crtc_helper_funcs and struct
544 * &drm_encoder_helper_funcs.
545 *
546 * This function is deprecated. New drivers must implement atomic modeset
547 * support, for which this function is unsuitable. Instead drivers should use
548 * drm_atomic_helper_set_config().
549 *
550 * Returns:
551 * Returns 0 on success, negative errno numbers on failure.
552 */
553int drm_crtc_helper_set_config(struct drm_mode_set *set,
554 struct drm_modeset_acquire_ctx *ctx)
555{
556 struct drm_device *dev;
557 struct drm_crtc **save_encoder_crtcs, *new_crtc;
558 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
559 bool mode_changed = false; /* if true do a full mode set */
560 bool fb_changed = false; /* if true and !mode_changed just do a flip */
561 struct drm_connector *connector;
562 struct drm_connector_list_iter conn_iter;
563 int count = 0, ro, fail = 0;
564 const struct drm_crtc_helper_funcs *crtc_funcs;
565 struct drm_mode_set save_set;
566 int ret;
567 int i;
568
569 BUG_ON(!set);
570 BUG_ON(!set->crtc);
571 BUG_ON(!set->crtc->helper_private);
572
573 /* Enforce sane interface api - has been abused by the fb helper. */
574 BUG_ON(!set->mode && set->fb);
575 BUG_ON(set->fb && set->num_connectors == 0);
576
577 crtc_funcs = set->crtc->helper_private;
578
579 dev = set->crtc->dev;
580
581 drm_dbg_kms(dev, "\n");
582
583 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
584
585 if (!set->mode)
586 set->fb = NULL;
587
588 if (set->fb) {
589 drm_dbg_kms(dev, "[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
590 set->crtc->base.id, set->crtc->name,
591 set->fb->base.id,
592 (int)set->num_connectors, set->x, set->y);
593 } else {
594 drm_dbg_kms(dev, "[CRTC:%d:%s] [NOFB]\n",
595 set->crtc->base.id, set->crtc->name);
596 drm_crtc_helper_disable(set->crtc);
597 return 0;
598 }
599
600 drm_warn_on_modeset_not_all_locked(dev);
601
602 /*
603 * Allocate space for the backup of all (non-pointer) encoder and
604 * connector data.
605 */
606 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder,
607 sizeof(struct drm_crtc *), GFP_KERNEL);
608 if (!save_encoder_crtcs)
609 return -ENOMEM;
610
611 save_connector_encoders = kcalloc(dev->mode_config.num_connector,
612 sizeof(struct drm_encoder *), GFP_KERNEL);
613 if (!save_connector_encoders) {
614 kfree(save_encoder_crtcs);
615 return -ENOMEM;
616 }
617
618 /*
619 * Copy data. Note that driver private data is not affected.
620 * Should anything bad happen only the expected state is
621 * restored, not the drivers personal bookkeeping.
622 */
623 count = 0;
624 drm_for_each_encoder(encoder, dev) {
625 save_encoder_crtcs[count++] = encoder->crtc;
626 }
627
628 count = 0;
629 drm_connector_list_iter_begin(dev, &conn_iter);
630 drm_for_each_connector_iter(connector, &conn_iter)
631 save_connector_encoders[count++] = connector->encoder;
632 drm_connector_list_iter_end(&conn_iter);
633
634 save_set.crtc = set->crtc;
635 save_set.mode = &set->crtc->mode;
636 save_set.x = set->crtc->x;
637 save_set.y = set->crtc->y;
638 save_set.fb = set->crtc->primary->fb;
639
640 /* We should be able to check here if the fb has the same properties
641 * and then just flip_or_move it */
642 if (set->crtc->primary->fb != set->fb) {
643 /* If we have no fb then treat it as a full mode set */
644 if (set->crtc->primary->fb == NULL) {
645 drm_dbg_kms(dev, "[CRTC:%d:%s] no fb, full mode set\n",
646 set->crtc->base.id, set->crtc->name);
647 mode_changed = true;
648 } else if (set->fb->format != set->crtc->primary->fb->format) {
649 mode_changed = true;
650 } else
651 fb_changed = true;
652 }
653
654 if (set->x != set->crtc->x || set->y != set->crtc->y)
655 fb_changed = true;
656
657 if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
658 drm_dbg_kms(dev, "[CRTC:%d:%s] modes are different, full mode set:\n",
659 set->crtc->base.id, set->crtc->name);
660 drm_dbg_kms(dev, DRM_MODE_FMT "\n", DRM_MODE_ARG(&set->crtc->mode));
661 drm_dbg_kms(dev, DRM_MODE_FMT "\n", DRM_MODE_ARG(set->mode));
662 mode_changed = true;
663 }
664
665 /* take a reference on all unbound connectors in set, reuse the
666 * already taken reference for bound connectors
667 */
668 for (ro = 0; ro < set->num_connectors; ro++) {
669 if (set->connectors[ro]->encoder)
670 continue;
671 drm_connector_get(set->connectors[ro]);
672 }
673
674 /* a) traverse passed in connector list and get encoders for them */
675 count = 0;
676 drm_connector_list_iter_begin(dev, &conn_iter);
677 drm_for_each_connector_iter(connector, &conn_iter) {
678 const struct drm_connector_helper_funcs *connector_funcs =
679 connector->helper_private;
680 new_encoder = connector->encoder;
681 for (ro = 0; ro < set->num_connectors; ro++) {
682 if (set->connectors[ro] == connector) {
683 if (connector_funcs->best_encoder)
684 new_encoder = connector_funcs->best_encoder(connector);
685 else
686 new_encoder = drm_connector_get_single_encoder(connector);
687
688 /* if we can't get an encoder for a connector
689 we are setting now - then fail */
690 if (new_encoder == NULL)
691 /* don't break so fail path works correct */
692 fail = 1;
693
694 if (connector->dpms != DRM_MODE_DPMS_ON) {
695 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] DPMS not on, full mode switch\n",
696 connector->base.id, connector->name);
697 mode_changed = true;
698 }
699
700 break;
701 }
702 }
703
704 if (new_encoder != connector->encoder) {
705 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] encoder changed, full mode switch\n",
706 connector->base.id, connector->name);
707 mode_changed = true;
708 /* If the encoder is reused for another connector, then
709 * the appropriate crtc will be set later.
710 */
711 if (connector->encoder)
712 connector->encoder->crtc = NULL;
713 connector->encoder = new_encoder;
714 }
715 }
716 drm_connector_list_iter_end(&conn_iter);
717
718 if (fail) {
719 ret = -EINVAL;
720 goto fail;
721 }
722
723 count = 0;
724 drm_connector_list_iter_begin(dev, &conn_iter);
725 drm_for_each_connector_iter(connector, &conn_iter) {
726 if (!connector->encoder)
727 continue;
728
729 if (connector->encoder->crtc == set->crtc)
730 new_crtc = NULL;
731 else
732 new_crtc = connector->encoder->crtc;
733
734 for (ro = 0; ro < set->num_connectors; ro++) {
735 if (set->connectors[ro] == connector)
736 new_crtc = set->crtc;
737 }
738
739 /* Make sure the new CRTC will work with the encoder */
740 if (new_crtc &&
741 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
742 ret = -EINVAL;
743 drm_connector_list_iter_end(&conn_iter);
744 goto fail;
745 }
746 if (new_crtc != connector->encoder->crtc) {
747 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] CRTC changed, full mode switch\n",
748 connector->base.id, connector->name);
749 mode_changed = true;
750 connector->encoder->crtc = new_crtc;
751 }
752 if (new_crtc) {
753 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
754 connector->base.id, connector->name,
755 new_crtc->base.id, new_crtc->name);
756 } else {
757 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] to [NOCRTC]\n",
758 connector->base.id, connector->name);
759 }
760 }
761 drm_connector_list_iter_end(&conn_iter);
762
763 /* mode_set_base is not a required function */
764 if (fb_changed && !crtc_funcs->mode_set_base)
765 mode_changed = true;
766
767 if (mode_changed) {
768 if (drm_helper_crtc_in_use(set->crtc)) {
769 drm_dbg_kms(dev, "[CRTC:%d:%s] attempting to set mode from userspace: " DRM_MODE_FMT "\n",
770 set->crtc->base.id, set->crtc->name, DRM_MODE_ARG(set->mode));
771 set->crtc->primary->fb = set->fb;
772 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
773 set->x, set->y,
774 save_set.fb)) {
775 drm_err(dev, "[CRTC:%d:%s] failed to set mode\n",
776 set->crtc->base.id, set->crtc->name);
777 set->crtc->primary->fb = save_set.fb;
778 ret = -EINVAL;
779 goto fail;
780 }
781 drm_dbg_kms(dev, "[CRTC:%d:%s] Setting connector DPMS state to on\n",
782 set->crtc->base.id, set->crtc->name);
783 for (i = 0; i < set->num_connectors; i++) {
784 drm_dbg_kms(dev, "\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
785 set->connectors[i]->name);
786 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
787 }
788 }
789 __drm_helper_disable_unused_functions(dev);
790 } else if (fb_changed) {
791 set->crtc->x = set->x;
792 set->crtc->y = set->y;
793 set->crtc->primary->fb = set->fb;
794 ret = crtc_funcs->mode_set_base(set->crtc,
795 set->x, set->y, save_set.fb);
796 if (ret != 0) {
797 set->crtc->x = save_set.x;
798 set->crtc->y = save_set.y;
799 set->crtc->primary->fb = save_set.fb;
800 goto fail;
801 }
802 }
803
804 kfree(save_connector_encoders);
805 kfree(save_encoder_crtcs);
806 return 0;
807
808fail:
809 /* Restore all previous data. */
810 count = 0;
811 drm_for_each_encoder(encoder, dev) {
812 encoder->crtc = save_encoder_crtcs[count++];
813 }
814
815 count = 0;
816 drm_connector_list_iter_begin(dev, &conn_iter);
817 drm_for_each_connector_iter(connector, &conn_iter)
818 connector->encoder = save_connector_encoders[count++];
819 drm_connector_list_iter_end(&conn_iter);
820
821 /* after fail drop reference on all unbound connectors in set, let
822 * bound connectors keep their reference
823 */
824 for (ro = 0; ro < set->num_connectors; ro++) {
825 if (set->connectors[ro]->encoder)
826 continue;
827 drm_connector_put(set->connectors[ro]);
828 }
829
830 /* Try to restore the config */
831 if (mode_changed &&
832 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
833 save_set.y, save_set.fb))
834 drm_err(dev, "failed to restore config after modeset failure\n");
835
836 kfree(save_connector_encoders);
837 kfree(save_encoder_crtcs);
838 return ret;
839}
840EXPORT_SYMBOL(drm_crtc_helper_set_config);
841
842static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
843{
844 int dpms = DRM_MODE_DPMS_OFF;
845 struct drm_connector *connector;
846 struct drm_connector_list_iter conn_iter;
847 struct drm_device *dev = encoder->dev;
848
849 drm_connector_list_iter_begin(dev, &conn_iter);
850 drm_for_each_connector_iter(connector, &conn_iter)
851 if (connector->encoder == encoder)
852 if (connector->dpms < dpms)
853 dpms = connector->dpms;
854 drm_connector_list_iter_end(&conn_iter);
855
856 return dpms;
857}
858
859/* Helper which handles bridge ordering around encoder dpms */
860static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
861{
862 const struct drm_encoder_helper_funcs *encoder_funcs;
863
864 encoder_funcs = encoder->helper_private;
865 if (!encoder_funcs)
866 return;
867
868 if (encoder_funcs->dpms)
869 encoder_funcs->dpms(encoder, mode);
870}
871
872static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
873{
874 int dpms = DRM_MODE_DPMS_OFF;
875 struct drm_connector *connector;
876 struct drm_connector_list_iter conn_iter;
877 struct drm_device *dev = crtc->dev;
878
879 drm_connector_list_iter_begin(dev, &conn_iter);
880 drm_for_each_connector_iter(connector, &conn_iter)
881 if (connector->encoder && connector->encoder->crtc == crtc)
882 if (connector->dpms < dpms)
883 dpms = connector->dpms;
884 drm_connector_list_iter_end(&conn_iter);
885
886 return dpms;
887}
888
889/**
890 * drm_helper_connector_dpms() - connector dpms helper implementation
891 * @connector: affected connector
892 * @mode: DPMS mode
893 *
894 * The drm_helper_connector_dpms() helper function implements the
895 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
896 * helpers.
897 *
898 * This is the main helper function provided by the CRTC helper framework for
899 * implementing the DPMS connector attribute. It computes the new desired DPMS
900 * state for all encoders and CRTCs in the output mesh and calls the
901 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
902 * provided by the driver.
903 *
904 * This function is deprecated. New drivers must implement atomic modeset
905 * support, where DPMS is handled in the DRM core.
906 *
907 * Returns:
908 * Always returns 0.
909 */
910int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
911{
912 struct drm_encoder *encoder = connector->encoder;
913 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
914 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
915
916 drm_WARN_ON(connector->dev, drm_drv_uses_atomic_modeset(connector->dev));
917
918 if (mode == connector->dpms)
919 return 0;
920
921 old_dpms = connector->dpms;
922 connector->dpms = mode;
923
924 if (encoder)
925 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
926
927 /* from off to on, do crtc then encoder */
928 if (mode < old_dpms) {
929 if (crtc) {
930 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
931
932 if (crtc_funcs->dpms)
933 (*crtc_funcs->dpms) (crtc,
934 drm_helper_choose_crtc_dpms(crtc));
935 }
936 if (encoder)
937 drm_helper_encoder_dpms(encoder, encoder_dpms);
938 }
939
940 /* from on to off, do encoder then crtc */
941 if (mode > old_dpms) {
942 if (encoder)
943 drm_helper_encoder_dpms(encoder, encoder_dpms);
944 if (crtc) {
945 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
946
947 if (crtc_funcs->dpms)
948 (*crtc_funcs->dpms) (crtc,
949 drm_helper_choose_crtc_dpms(crtc));
950 }
951 }
952
953 return 0;
954}
955EXPORT_SYMBOL(drm_helper_connector_dpms);
956
957/**
958 * drm_helper_resume_force_mode - force-restore mode setting configuration
959 * @dev: drm_device which should be restored
960 *
961 * Drivers which use the mode setting helpers can use this function to
962 * force-restore the mode setting configuration e.g. on resume or when something
963 * else might have trampled over the hw state (like some overzealous old BIOSen
964 * tended to do).
965 *
966 * This helper doesn't provide a error return value since restoring the old
967 * config should never fail due to resource allocation issues since the driver
968 * has successfully set the restored configuration already. Hence this should
969 * boil down to the equivalent of a few dpms on calls, which also don't provide
970 * an error code.
971 *
972 * Drivers where simply restoring an old configuration again might fail (e.g.
973 * due to slight differences in allocating shared resources when the
974 * configuration is restored in a different order than when userspace set it up)
975 * need to use their own restore logic.
976 *
977 * This function is deprecated. New drivers should implement atomic mode-
978 * setting and use the atomic suspend/resume helpers.
979 *
980 * See also:
981 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
982 */
983void drm_helper_resume_force_mode(struct drm_device *dev)
984{
985 struct drm_crtc *crtc;
986 struct drm_encoder *encoder;
987 const struct drm_crtc_helper_funcs *crtc_funcs;
988 int encoder_dpms;
989 bool ret;
990
991 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
992
993 drm_modeset_lock_all(dev);
994 drm_for_each_crtc(crtc, dev) {
995
996 if (!crtc->enabled)
997 continue;
998
999 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
1000 crtc->x, crtc->y, crtc->primary->fb);
1001
1002 /* Restoring the old config should never fail! */
1003 if (ret == false)
1004 drm_err(dev, "failed to set mode on crtc %p\n", crtc);
1005
1006 /* Turn off outputs that were already powered off */
1007 if (drm_helper_choose_crtc_dpms(crtc)) {
1008 drm_for_each_encoder(encoder, dev) {
1009
1010 if(encoder->crtc != crtc)
1011 continue;
1012
1013 encoder_dpms = drm_helper_choose_encoder_dpms(
1014 encoder);
1015
1016 drm_helper_encoder_dpms(encoder, encoder_dpms);
1017 }
1018
1019 crtc_funcs = crtc->helper_private;
1020 if (crtc_funcs->dpms)
1021 (*crtc_funcs->dpms) (crtc,
1022 drm_helper_choose_crtc_dpms(crtc));
1023 }
1024 }
1025
1026 /* disable the unused connectors while restoring the modesetting */
1027 __drm_helper_disable_unused_functions(dev);
1028 drm_modeset_unlock_all(dev);
1029}
1030EXPORT_SYMBOL(drm_helper_resume_force_mode);
1031
1032/**
1033 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs
1034 * @dev: DRM device whose CRTCs to turn off
1035 *
1036 * Drivers may want to call this on unload to ensure that all displays are
1037 * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
1038 *
1039 * Note: This should only be used by non-atomic legacy drivers. For an atomic
1040 * version look at drm_atomic_helper_shutdown().
1041 *
1042 * Returns:
1043 * Zero on success, error code on failure.
1044 */
1045int drm_helper_force_disable_all(struct drm_device *dev)
1046{
1047 struct drm_crtc *crtc;
1048 int ret = 0;
1049
1050 drm_modeset_lock_all(dev);
1051 drm_for_each_crtc(crtc, dev)
1052 if (crtc->enabled) {
1053 struct drm_mode_set set = {
1054 .crtc = crtc,
1055 };
1056
1057 ret = drm_mode_set_config_internal(&set);
1058 if (ret)
1059 goto out;
1060 }
1061out:
1062 drm_modeset_unlock_all(dev);
1063 return ret;
1064}
1065EXPORT_SYMBOL(drm_helper_force_disable_all);
1/*
2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
4 *
5 * DRM core CRTC related functions
6 *
7 * Permission to use, copy, modify, distribute, and sell this software and its
8 * documentation for any purpose is hereby granted without fee, provided that
9 * the above copyright notice appear in all copies and that both that copyright
10 * notice and this permission notice appear in supporting documentation, and
11 * that the name of the copyright holders not be used in advertising or
12 * publicity pertaining to distribution of the software without specific,
13 * written prior permission. The copyright holders make no representations
14 * about the suitability of this software for any purpose. It is provided "as
15 * is" without express or implied warranty.
16 *
17 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
19 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
21 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
22 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 * OF THIS SOFTWARE.
24 *
25 * Authors:
26 * Keith Packard
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
30 */
31
32#include <linux/kernel.h>
33#include <linux/export.h>
34#include <linux/moduleparam.h>
35
36#include <drm/drmP.h>
37#include <drm/drm_atomic.h>
38#include <drm/drm_crtc.h>
39#include <drm/drm_fourcc.h>
40#include <drm/drm_crtc_helper.h>
41#include <drm/drm_fb_helper.h>
42#include <drm/drm_plane_helper.h>
43#include <drm/drm_atomic_helper.h>
44#include <drm/drm_edid.h>
45
46/**
47 * DOC: overview
48 *
49 * The CRTC modeset helper library provides a default set_config implementation
50 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
51 * the same callbacks which drivers can use to e.g. restore the modeset
52 * configuration on resume with drm_helper_resume_force_mode().
53 *
54 * Note that this helper library doesn't track the current power state of CRTCs
55 * and encoders. It can call callbacks like ->dpms() even though the hardware is
56 * already in the desired state. This deficiency has been fixed in the atomic
57 * helpers.
58 *
59 * The driver callbacks are mostly compatible with the atomic modeset helpers,
60 * except for the handling of the primary plane: Atomic helpers require that the
61 * primary plane is implemented as a real standalone plane and not directly tied
62 * to the CRTC state. For easier transition this library provides functions to
63 * implement the old semantics required by the CRTC helpers using the new plane
64 * and atomic helper callbacks.
65 *
66 * Drivers are strongly urged to convert to the atomic helpers (by way of first
67 * converting to the plane helpers). New drivers must not use these functions
68 * but need to implement the atomic interface instead, potentially using the
69 * atomic helpers for that.
70 *
71 * These legacy modeset helpers use the same function table structures as
72 * all other modesetting helpers. See the documentation for struct
73 * &drm_crtc_helper_funcs, struct &drm_encoder_helper_funcs and struct
74 * &drm_connector_helper_funcs.
75 */
76
77/**
78 * drm_helper_encoder_in_use - check if a given encoder is in use
79 * @encoder: encoder to check
80 *
81 * Checks whether @encoder is with the current mode setting output configuration
82 * in use by any connector. This doesn't mean that it is actually enabled since
83 * the DPMS state is tracked separately.
84 *
85 * Returns:
86 * True if @encoder is used, false otherwise.
87 */
88bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
89{
90 struct drm_connector *connector;
91 struct drm_device *dev = encoder->dev;
92
93 /*
94 * We can expect this mutex to be locked if we are not panicking.
95 * Locking is currently fubar in the panic handler.
96 */
97 if (!oops_in_progress) {
98 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
99 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
100 }
101
102 drm_for_each_connector(connector, dev)
103 if (connector->encoder == encoder)
104 return true;
105 return false;
106}
107EXPORT_SYMBOL(drm_helper_encoder_in_use);
108
109/**
110 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
111 * @crtc: CRTC to check
112 *
113 * Checks whether @crtc is with the current mode setting output configuration
114 * in use by any connector. This doesn't mean that it is actually enabled since
115 * the DPMS state is tracked separately.
116 *
117 * Returns:
118 * True if @crtc is used, false otherwise.
119 */
120bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
121{
122 struct drm_encoder *encoder;
123 struct drm_device *dev = crtc->dev;
124
125 /*
126 * We can expect this mutex to be locked if we are not panicking.
127 * Locking is currently fubar in the panic handler.
128 */
129 if (!oops_in_progress)
130 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
131
132 drm_for_each_encoder(encoder, dev)
133 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
134 return true;
135 return false;
136}
137EXPORT_SYMBOL(drm_helper_crtc_in_use);
138
139static void
140drm_encoder_disable(struct drm_encoder *encoder)
141{
142 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
143
144 if (!encoder_funcs)
145 return;
146
147 drm_bridge_disable(encoder->bridge);
148
149 if (encoder_funcs->disable)
150 (*encoder_funcs->disable)(encoder);
151 else if (encoder_funcs->dpms)
152 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
153
154 drm_bridge_post_disable(encoder->bridge);
155}
156
157static void __drm_helper_disable_unused_functions(struct drm_device *dev)
158{
159 struct drm_encoder *encoder;
160 struct drm_crtc *crtc;
161
162 drm_warn_on_modeset_not_all_locked(dev);
163
164 drm_for_each_encoder(encoder, dev) {
165 if (!drm_helper_encoder_in_use(encoder)) {
166 drm_encoder_disable(encoder);
167 /* disconnect encoder from any connector */
168 encoder->crtc = NULL;
169 }
170 }
171
172 drm_for_each_crtc(crtc, dev) {
173 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
174 crtc->enabled = drm_helper_crtc_in_use(crtc);
175 if (!crtc->enabled) {
176 if (crtc_funcs->disable)
177 (*crtc_funcs->disable)(crtc);
178 else
179 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
180 crtc->primary->fb = NULL;
181 }
182 }
183}
184
185/**
186 * drm_helper_disable_unused_functions - disable unused objects
187 * @dev: DRM device
188 *
189 * This function walks through the entire mode setting configuration of @dev. It
190 * will remove any CRTC links of unused encoders and encoder links of
191 * disconnected connectors. Then it will disable all unused encoders and CRTCs
192 * either by calling their disable callback if available or by calling their
193 * dpms callback with DRM_MODE_DPMS_OFF.
194 *
195 * NOTE:
196 *
197 * This function is part of the legacy modeset helper library and will cause
198 * major confusion with atomic drivers. This is because atomic helpers guarantee
199 * to never call ->disable() hooks on a disabled function, or ->enable() hooks
200 * on an enabled functions. drm_helper_disable_unused_functions() on the other
201 * hand throws such guarantees into the wind and calls disable hooks
202 * unconditionally on unused functions.
203 */
204void drm_helper_disable_unused_functions(struct drm_device *dev)
205{
206 if (drm_core_check_feature(dev, DRIVER_ATOMIC))
207 DRM_ERROR("Called for atomic driver, this is not what you want.\n");
208
209 drm_modeset_lock_all(dev);
210 __drm_helper_disable_unused_functions(dev);
211 drm_modeset_unlock_all(dev);
212}
213EXPORT_SYMBOL(drm_helper_disable_unused_functions);
214
215/*
216 * Check the CRTC we're going to map each output to vs. its current
217 * CRTC. If they don't match, we have to disable the output and the CRTC
218 * since the driver will have to re-route things.
219 */
220static void
221drm_crtc_prepare_encoders(struct drm_device *dev)
222{
223 const struct drm_encoder_helper_funcs *encoder_funcs;
224 struct drm_encoder *encoder;
225
226 drm_for_each_encoder(encoder, dev) {
227 encoder_funcs = encoder->helper_private;
228 if (!encoder_funcs)
229 continue;
230
231 /* Disable unused encoders */
232 if (encoder->crtc == NULL)
233 drm_encoder_disable(encoder);
234 /* Disable encoders whose CRTC is about to change */
235 if (encoder_funcs->get_crtc &&
236 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
237 drm_encoder_disable(encoder);
238 }
239}
240
241/**
242 * drm_crtc_helper_set_mode - internal helper to set a mode
243 * @crtc: CRTC to program
244 * @mode: mode to use
245 * @x: horizontal offset into the surface
246 * @y: vertical offset into the surface
247 * @old_fb: old framebuffer, for cleanup
248 *
249 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
250 * to fixup or reject the mode prior to trying to set it. This is an internal
251 * helper that drivers could e.g. use to update properties that require the
252 * entire output pipe to be disabled and re-enabled in a new configuration. For
253 * example for changing whether audio is enabled on a hdmi link or for changing
254 * panel fitter or dither attributes. It is also called by the
255 * drm_crtc_helper_set_config() helper function to drive the mode setting
256 * sequence.
257 *
258 * Returns:
259 * True if the mode was set successfully, false otherwise.
260 */
261bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
262 struct drm_display_mode *mode,
263 int x, int y,
264 struct drm_framebuffer *old_fb)
265{
266 struct drm_device *dev = crtc->dev;
267 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
268 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
269 const struct drm_encoder_helper_funcs *encoder_funcs;
270 int saved_x, saved_y;
271 bool saved_enabled;
272 struct drm_encoder *encoder;
273 bool ret = true;
274
275 drm_warn_on_modeset_not_all_locked(dev);
276
277 saved_enabled = crtc->enabled;
278 crtc->enabled = drm_helper_crtc_in_use(crtc);
279 if (!crtc->enabled)
280 return true;
281
282 adjusted_mode = drm_mode_duplicate(dev, mode);
283 if (!adjusted_mode) {
284 crtc->enabled = saved_enabled;
285 return false;
286 }
287
288 saved_mode = crtc->mode;
289 saved_hwmode = crtc->hwmode;
290 saved_x = crtc->x;
291 saved_y = crtc->y;
292
293 /* Update crtc values up front so the driver can rely on them for mode
294 * setting.
295 */
296 crtc->mode = *mode;
297 crtc->x = x;
298 crtc->y = y;
299
300 /* Pass our mode to the connectors and the CRTC to give them a chance to
301 * adjust it according to limitations or connector properties, and also
302 * a chance to reject the mode entirely.
303 */
304 drm_for_each_encoder(encoder, dev) {
305
306 if (encoder->crtc != crtc)
307 continue;
308
309 encoder_funcs = encoder->helper_private;
310 if (!encoder_funcs)
311 continue;
312
313 ret = drm_bridge_mode_fixup(encoder->bridge,
314 mode, adjusted_mode);
315 if (!ret) {
316 DRM_DEBUG_KMS("Bridge fixup failed\n");
317 goto done;
318 }
319
320 encoder_funcs = encoder->helper_private;
321 if (encoder_funcs->mode_fixup) {
322 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
323 adjusted_mode))) {
324 DRM_DEBUG_KMS("Encoder fixup failed\n");
325 goto done;
326 }
327 }
328 }
329
330 if (crtc_funcs->mode_fixup) {
331 if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
332 adjusted_mode))) {
333 DRM_DEBUG_KMS("CRTC fixup failed\n");
334 goto done;
335 }
336 }
337 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
338
339 crtc->hwmode = *adjusted_mode;
340
341 /* Prepare the encoders and CRTCs before setting the mode. */
342 drm_for_each_encoder(encoder, dev) {
343
344 if (encoder->crtc != crtc)
345 continue;
346
347 encoder_funcs = encoder->helper_private;
348 if (!encoder_funcs)
349 continue;
350
351 drm_bridge_disable(encoder->bridge);
352
353 /* Disable the encoders as the first thing we do. */
354 if (encoder_funcs->prepare)
355 encoder_funcs->prepare(encoder);
356
357 drm_bridge_post_disable(encoder->bridge);
358 }
359
360 drm_crtc_prepare_encoders(dev);
361
362 crtc_funcs->prepare(crtc);
363
364 /* Set up the DPLL and any encoders state that needs to adjust or depend
365 * on the DPLL.
366 */
367 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
368 if (!ret)
369 goto done;
370
371 drm_for_each_encoder(encoder, dev) {
372
373 if (encoder->crtc != crtc)
374 continue;
375
376 encoder_funcs = encoder->helper_private;
377 if (!encoder_funcs)
378 continue;
379
380 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
381 encoder->base.id, encoder->name,
382 mode->base.id, mode->name);
383 if (encoder_funcs->mode_set)
384 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
385
386 drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
387 }
388
389 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
390 crtc_funcs->commit(crtc);
391
392 drm_for_each_encoder(encoder, dev) {
393
394 if (encoder->crtc != crtc)
395 continue;
396
397 encoder_funcs = encoder->helper_private;
398 if (!encoder_funcs)
399 continue;
400
401 drm_bridge_pre_enable(encoder->bridge);
402
403 if (encoder_funcs->commit)
404 encoder_funcs->commit(encoder);
405
406 drm_bridge_enable(encoder->bridge);
407 }
408
409 /* Calculate and store various constants which
410 * are later needed by vblank and swap-completion
411 * timestamping. They are derived from true hwmode.
412 */
413 drm_calc_timestamping_constants(crtc, &crtc->hwmode);
414
415 /* FIXME: add subpixel order */
416done:
417 drm_mode_destroy(dev, adjusted_mode);
418 if (!ret) {
419 crtc->enabled = saved_enabled;
420 crtc->mode = saved_mode;
421 crtc->hwmode = saved_hwmode;
422 crtc->x = saved_x;
423 crtc->y = saved_y;
424 }
425
426 return ret;
427}
428EXPORT_SYMBOL(drm_crtc_helper_set_mode);
429
430static void
431drm_crtc_helper_disable(struct drm_crtc *crtc)
432{
433 struct drm_device *dev = crtc->dev;
434 struct drm_connector *connector;
435 struct drm_encoder *encoder;
436
437 /* Decouple all encoders and their attached connectors from this crtc */
438 drm_for_each_encoder(encoder, dev) {
439 if (encoder->crtc != crtc)
440 continue;
441
442 drm_for_each_connector(connector, dev) {
443 if (connector->encoder != encoder)
444 continue;
445
446 connector->encoder = NULL;
447
448 /*
449 * drm_helper_disable_unused_functions() ought to be
450 * doing this, but since we've decoupled the encoder
451 * from the connector above, the required connection
452 * between them is henceforth no longer available.
453 */
454 connector->dpms = DRM_MODE_DPMS_OFF;
455
456 /* we keep a reference while the encoder is bound */
457 drm_connector_unreference(connector);
458 }
459 }
460
461 __drm_helper_disable_unused_functions(dev);
462}
463
464/**
465 * drm_crtc_helper_set_config - set a new config from userspace
466 * @set: mode set configuration
467 *
468 * The drm_crtc_helper_set_config() helper function implements the set_config
469 * callback of struct &drm_crtc_funcs for drivers using the legacy CRTC helpers.
470 *
471 * It first tries to locate the best encoder for each connector by calling the
472 * connector ->best_encoder() (struct &drm_connector_helper_funcs) helper
473 * operation.
474 *
475 * After locating the appropriate encoders, the helper function will call the
476 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
477 * or reject it completely in which case an error will be returned to the
478 * application. If the new configuration after mode adjustment is identical to
479 * the current configuration the helper function will return without performing
480 * any other operation.
481 *
482 * If the adjusted mode is identical to the current mode but changes to the
483 * frame buffer need to be applied, the drm_crtc_helper_set_config() function
484 * will call the CRTC ->mode_set_base() (struct &drm_crtc_helper_funcs) helper
485 * operation.
486 *
487 * If the adjusted mode differs from the current mode, or if the
488 * ->mode_set_base() helper operation is not provided, the helper function
489 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
490 * and ->commit() CRTC and encoder helper operations, in that order.
491 * Alternatively it can also use the dpms and disable helper operations. For
492 * details see struct &drm_crtc_helper_funcs and struct
493 * &drm_encoder_helper_funcs.
494 *
495 * This function is deprecated. New drivers must implement atomic modeset
496 * support, for which this function is unsuitable. Instead drivers should use
497 * drm_atomic_helper_set_config().
498 *
499 * Returns:
500 * Returns 0 on success, negative errno numbers on failure.
501 */
502int drm_crtc_helper_set_config(struct drm_mode_set *set)
503{
504 struct drm_device *dev;
505 struct drm_crtc **save_encoder_crtcs, *new_crtc;
506 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
507 bool mode_changed = false; /* if true do a full mode set */
508 bool fb_changed = false; /* if true and !mode_changed just do a flip */
509 struct drm_connector *connector;
510 int count = 0, ro, fail = 0;
511 const struct drm_crtc_helper_funcs *crtc_funcs;
512 struct drm_mode_set save_set;
513 int ret;
514 int i;
515
516 DRM_DEBUG_KMS("\n");
517
518 BUG_ON(!set);
519 BUG_ON(!set->crtc);
520 BUG_ON(!set->crtc->helper_private);
521
522 /* Enforce sane interface api - has been abused by the fb helper. */
523 BUG_ON(!set->mode && set->fb);
524 BUG_ON(set->fb && set->num_connectors == 0);
525
526 crtc_funcs = set->crtc->helper_private;
527
528 if (!set->mode)
529 set->fb = NULL;
530
531 if (set->fb) {
532 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
533 set->crtc->base.id, set->crtc->name,
534 set->fb->base.id,
535 (int)set->num_connectors, set->x, set->y);
536 } else {
537 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
538 set->crtc->base.id, set->crtc->name);
539 drm_crtc_helper_disable(set->crtc);
540 return 0;
541 }
542
543 dev = set->crtc->dev;
544
545 drm_warn_on_modeset_not_all_locked(dev);
546
547 /*
548 * Allocate space for the backup of all (non-pointer) encoder and
549 * connector data.
550 */
551 save_encoder_crtcs = kzalloc(dev->mode_config.num_encoder *
552 sizeof(struct drm_crtc *), GFP_KERNEL);
553 if (!save_encoder_crtcs)
554 return -ENOMEM;
555
556 save_connector_encoders = kzalloc(dev->mode_config.num_connector *
557 sizeof(struct drm_encoder *), GFP_KERNEL);
558 if (!save_connector_encoders) {
559 kfree(save_encoder_crtcs);
560 return -ENOMEM;
561 }
562
563 /*
564 * Copy data. Note that driver private data is not affected.
565 * Should anything bad happen only the expected state is
566 * restored, not the drivers personal bookkeeping.
567 */
568 count = 0;
569 drm_for_each_encoder(encoder, dev) {
570 save_encoder_crtcs[count++] = encoder->crtc;
571 }
572
573 count = 0;
574 drm_for_each_connector(connector, dev) {
575 save_connector_encoders[count++] = connector->encoder;
576 }
577
578 save_set.crtc = set->crtc;
579 save_set.mode = &set->crtc->mode;
580 save_set.x = set->crtc->x;
581 save_set.y = set->crtc->y;
582 save_set.fb = set->crtc->primary->fb;
583
584 /* We should be able to check here if the fb has the same properties
585 * and then just flip_or_move it */
586 if (set->crtc->primary->fb != set->fb) {
587 /* If we have no fb then treat it as a full mode set */
588 if (set->crtc->primary->fb == NULL) {
589 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
590 mode_changed = true;
591 } else if (set->fb->pixel_format !=
592 set->crtc->primary->fb->pixel_format) {
593 mode_changed = true;
594 } else
595 fb_changed = true;
596 }
597
598 if (set->x != set->crtc->x || set->y != set->crtc->y)
599 fb_changed = true;
600
601 if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
602 DRM_DEBUG_KMS("modes are different, full mode set\n");
603 drm_mode_debug_printmodeline(&set->crtc->mode);
604 drm_mode_debug_printmodeline(set->mode);
605 mode_changed = true;
606 }
607
608 /* take a reference on all unbound connectors in set, reuse the
609 * already taken reference for bound connectors
610 */
611 for (ro = 0; ro < set->num_connectors; ro++) {
612 if (set->connectors[ro]->encoder)
613 continue;
614 drm_connector_reference(set->connectors[ro]);
615 }
616
617 /* a) traverse passed in connector list and get encoders for them */
618 count = 0;
619 drm_for_each_connector(connector, dev) {
620 const struct drm_connector_helper_funcs *connector_funcs =
621 connector->helper_private;
622 new_encoder = connector->encoder;
623 for (ro = 0; ro < set->num_connectors; ro++) {
624 if (set->connectors[ro] == connector) {
625 new_encoder = connector_funcs->best_encoder(connector);
626 /* if we can't get an encoder for a connector
627 we are setting now - then fail */
628 if (new_encoder == NULL)
629 /* don't break so fail path works correct */
630 fail = 1;
631
632 if (connector->dpms != DRM_MODE_DPMS_ON) {
633 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
634 mode_changed = true;
635 }
636
637 break;
638 }
639 }
640
641 if (new_encoder != connector->encoder) {
642 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
643 mode_changed = true;
644 /* If the encoder is reused for another connector, then
645 * the appropriate crtc will be set later.
646 */
647 if (connector->encoder)
648 connector->encoder->crtc = NULL;
649 connector->encoder = new_encoder;
650 }
651 }
652
653 if (fail) {
654 ret = -EINVAL;
655 goto fail;
656 }
657
658 count = 0;
659 drm_for_each_connector(connector, dev) {
660 if (!connector->encoder)
661 continue;
662
663 if (connector->encoder->crtc == set->crtc)
664 new_crtc = NULL;
665 else
666 new_crtc = connector->encoder->crtc;
667
668 for (ro = 0; ro < set->num_connectors; ro++) {
669 if (set->connectors[ro] == connector)
670 new_crtc = set->crtc;
671 }
672
673 /* Make sure the new CRTC will work with the encoder */
674 if (new_crtc &&
675 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
676 ret = -EINVAL;
677 goto fail;
678 }
679 if (new_crtc != connector->encoder->crtc) {
680 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
681 mode_changed = true;
682 connector->encoder->crtc = new_crtc;
683 }
684 if (new_crtc) {
685 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
686 connector->base.id, connector->name,
687 new_crtc->base.id, new_crtc->name);
688 } else {
689 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
690 connector->base.id, connector->name);
691 }
692 }
693
694 /* mode_set_base is not a required function */
695 if (fb_changed && !crtc_funcs->mode_set_base)
696 mode_changed = true;
697
698 if (mode_changed) {
699 if (drm_helper_crtc_in_use(set->crtc)) {
700 DRM_DEBUG_KMS("attempting to set mode from"
701 " userspace\n");
702 drm_mode_debug_printmodeline(set->mode);
703 set->crtc->primary->fb = set->fb;
704 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
705 set->x, set->y,
706 save_set.fb)) {
707 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
708 set->crtc->base.id, set->crtc->name);
709 set->crtc->primary->fb = save_set.fb;
710 ret = -EINVAL;
711 goto fail;
712 }
713 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
714 for (i = 0; i < set->num_connectors; i++) {
715 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
716 set->connectors[i]->name);
717 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
718 }
719 }
720 __drm_helper_disable_unused_functions(dev);
721 } else if (fb_changed) {
722 set->crtc->x = set->x;
723 set->crtc->y = set->y;
724 set->crtc->primary->fb = set->fb;
725 ret = crtc_funcs->mode_set_base(set->crtc,
726 set->x, set->y, save_set.fb);
727 if (ret != 0) {
728 set->crtc->x = save_set.x;
729 set->crtc->y = save_set.y;
730 set->crtc->primary->fb = save_set.fb;
731 goto fail;
732 }
733 }
734
735 kfree(save_connector_encoders);
736 kfree(save_encoder_crtcs);
737 return 0;
738
739fail:
740 /* Restore all previous data. */
741 count = 0;
742 drm_for_each_encoder(encoder, dev) {
743 encoder->crtc = save_encoder_crtcs[count++];
744 }
745
746 count = 0;
747 drm_for_each_connector(connector, dev) {
748 connector->encoder = save_connector_encoders[count++];
749 }
750
751 /* after fail drop reference on all unbound connectors in set, let
752 * bound connectors keep their reference
753 */
754 for (ro = 0; ro < set->num_connectors; ro++) {
755 if (set->connectors[ro]->encoder)
756 continue;
757 drm_connector_unreference(set->connectors[ro]);
758 }
759
760 /* Try to restore the config */
761 if (mode_changed &&
762 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
763 save_set.y, save_set.fb))
764 DRM_ERROR("failed to restore config after modeset failure\n");
765
766 kfree(save_connector_encoders);
767 kfree(save_encoder_crtcs);
768 return ret;
769}
770EXPORT_SYMBOL(drm_crtc_helper_set_config);
771
772static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
773{
774 int dpms = DRM_MODE_DPMS_OFF;
775 struct drm_connector *connector;
776 struct drm_device *dev = encoder->dev;
777
778 drm_for_each_connector(connector, dev)
779 if (connector->encoder == encoder)
780 if (connector->dpms < dpms)
781 dpms = connector->dpms;
782 return dpms;
783}
784
785/* Helper which handles bridge ordering around encoder dpms */
786static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
787{
788 struct drm_bridge *bridge = encoder->bridge;
789 const struct drm_encoder_helper_funcs *encoder_funcs;
790
791 encoder_funcs = encoder->helper_private;
792 if (!encoder_funcs)
793 return;
794
795 if (mode == DRM_MODE_DPMS_ON)
796 drm_bridge_pre_enable(bridge);
797 else
798 drm_bridge_disable(bridge);
799
800 if (encoder_funcs->dpms)
801 encoder_funcs->dpms(encoder, mode);
802
803 if (mode == DRM_MODE_DPMS_ON)
804 drm_bridge_enable(bridge);
805 else
806 drm_bridge_post_disable(bridge);
807}
808
809static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
810{
811 int dpms = DRM_MODE_DPMS_OFF;
812 struct drm_connector *connector;
813 struct drm_device *dev = crtc->dev;
814
815 drm_for_each_connector(connector, dev)
816 if (connector->encoder && connector->encoder->crtc == crtc)
817 if (connector->dpms < dpms)
818 dpms = connector->dpms;
819 return dpms;
820}
821
822/**
823 * drm_helper_connector_dpms() - connector dpms helper implementation
824 * @connector: affected connector
825 * @mode: DPMS mode
826 *
827 * The drm_helper_connector_dpms() helper function implements the ->dpms()
828 * callback of struct &drm_connector_funcs for drivers using the legacy CRTC helpers.
829 *
830 * This is the main helper function provided by the CRTC helper framework for
831 * implementing the DPMS connector attribute. It computes the new desired DPMS
832 * state for all encoders and CRTCs in the output mesh and calls the ->dpms()
833 * callbacks provided by the driver in struct &drm_crtc_helper_funcs and struct
834 * &drm_encoder_helper_funcs appropriately.
835 *
836 * This function is deprecated. New drivers must implement atomic modeset
837 * support, for which this function is unsuitable. Instead drivers should use
838 * drm_atomic_helper_connector_dpms().
839 *
840 * Returns:
841 * Always returns 0.
842 */
843int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
844{
845 struct drm_encoder *encoder = connector->encoder;
846 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
847 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
848
849 if (mode == connector->dpms)
850 return 0;
851
852 old_dpms = connector->dpms;
853 connector->dpms = mode;
854
855 if (encoder)
856 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
857
858 /* from off to on, do crtc then encoder */
859 if (mode < old_dpms) {
860 if (crtc) {
861 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
862 if (crtc_funcs->dpms)
863 (*crtc_funcs->dpms) (crtc,
864 drm_helper_choose_crtc_dpms(crtc));
865 }
866 if (encoder)
867 drm_helper_encoder_dpms(encoder, encoder_dpms);
868 }
869
870 /* from on to off, do encoder then crtc */
871 if (mode > old_dpms) {
872 if (encoder)
873 drm_helper_encoder_dpms(encoder, encoder_dpms);
874 if (crtc) {
875 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
876 if (crtc_funcs->dpms)
877 (*crtc_funcs->dpms) (crtc,
878 drm_helper_choose_crtc_dpms(crtc));
879 }
880 }
881
882 return 0;
883}
884EXPORT_SYMBOL(drm_helper_connector_dpms);
885
886/**
887 * drm_helper_resume_force_mode - force-restore mode setting configuration
888 * @dev: drm_device which should be restored
889 *
890 * Drivers which use the mode setting helpers can use this function to
891 * force-restore the mode setting configuration e.g. on resume or when something
892 * else might have trampled over the hw state (like some overzealous old BIOSen
893 * tended to do).
894 *
895 * This helper doesn't provide a error return value since restoring the old
896 * config should never fail due to resource allocation issues since the driver
897 * has successfully set the restored configuration already. Hence this should
898 * boil down to the equivalent of a few dpms on calls, which also don't provide
899 * an error code.
900 *
901 * Drivers where simply restoring an old configuration again might fail (e.g.
902 * due to slight differences in allocating shared resources when the
903 * configuration is restored in a different order than when userspace set it up)
904 * need to use their own restore logic.
905 *
906 * This function is deprecated. New drivers should implement atomic mode-
907 * setting and use the atomic suspend/resume helpers.
908 *
909 * See also:
910 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
911 */
912void drm_helper_resume_force_mode(struct drm_device *dev)
913{
914 struct drm_crtc *crtc;
915 struct drm_encoder *encoder;
916 const struct drm_crtc_helper_funcs *crtc_funcs;
917 int encoder_dpms;
918 bool ret;
919
920 drm_modeset_lock_all(dev);
921 drm_for_each_crtc(crtc, dev) {
922
923 if (!crtc->enabled)
924 continue;
925
926 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
927 crtc->x, crtc->y, crtc->primary->fb);
928
929 /* Restoring the old config should never fail! */
930 if (ret == false)
931 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
932
933 /* Turn off outputs that were already powered off */
934 if (drm_helper_choose_crtc_dpms(crtc)) {
935 drm_for_each_encoder(encoder, dev) {
936
937 if(encoder->crtc != crtc)
938 continue;
939
940 encoder_dpms = drm_helper_choose_encoder_dpms(
941 encoder);
942
943 drm_helper_encoder_dpms(encoder, encoder_dpms);
944 }
945
946 crtc_funcs = crtc->helper_private;
947 if (crtc_funcs->dpms)
948 (*crtc_funcs->dpms) (crtc,
949 drm_helper_choose_crtc_dpms(crtc));
950 }
951 }
952
953 /* disable the unused connectors while restoring the modesetting */
954 __drm_helper_disable_unused_functions(dev);
955 drm_modeset_unlock_all(dev);
956}
957EXPORT_SYMBOL(drm_helper_resume_force_mode);
958
959/**
960 * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers
961 * @crtc: DRM CRTC
962 * @mode: DRM display mode which userspace requested
963 * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks
964 * @x: x offset of the CRTC scanout area on the underlying framebuffer
965 * @y: y offset of the CRTC scanout area on the underlying framebuffer
966 * @old_fb: previous framebuffer
967 *
968 * This function implements a callback useable as the ->mode_set callback
969 * required by the CRTC helpers. Besides the atomic plane helper functions for
970 * the primary plane the driver must also provide the ->mode_set_nofb callback
971 * to set up the CRTC.
972 *
973 * This is a transitional helper useful for converting drivers to the atomic
974 * interfaces.
975 */
976int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
977 struct drm_display_mode *adjusted_mode, int x, int y,
978 struct drm_framebuffer *old_fb)
979{
980 struct drm_crtc_state *crtc_state;
981 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
982 int ret;
983
984 if (crtc->funcs->atomic_duplicate_state)
985 crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
986 else {
987 if (!crtc->state)
988 drm_atomic_helper_crtc_reset(crtc);
989
990 crtc_state = drm_atomic_helper_crtc_duplicate_state(crtc);
991 }
992
993 if (!crtc_state)
994 return -ENOMEM;
995
996 crtc_state->planes_changed = true;
997 crtc_state->mode_changed = true;
998 ret = drm_atomic_set_mode_for_crtc(crtc_state, mode);
999 if (ret)
1000 goto out;
1001 drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode);
1002
1003 if (crtc_funcs->atomic_check) {
1004 ret = crtc_funcs->atomic_check(crtc, crtc_state);
1005 if (ret)
1006 goto out;
1007 }
1008
1009 swap(crtc->state, crtc_state);
1010
1011 crtc_funcs->mode_set_nofb(crtc);
1012
1013 ret = drm_helper_crtc_mode_set_base(crtc, x, y, old_fb);
1014
1015out:
1016 if (crtc_state) {
1017 if (crtc->funcs->atomic_destroy_state)
1018 crtc->funcs->atomic_destroy_state(crtc, crtc_state);
1019 else
1020 drm_atomic_helper_crtc_destroy_state(crtc, crtc_state);
1021 }
1022
1023 return ret;
1024}
1025EXPORT_SYMBOL(drm_helper_crtc_mode_set);
1026
1027/**
1028 * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers
1029 * @crtc: DRM CRTC
1030 * @x: x offset of the CRTC scanout area on the underlying framebuffer
1031 * @y: y offset of the CRTC scanout area on the underlying framebuffer
1032 * @old_fb: previous framebuffer
1033 *
1034 * This function implements a callback useable as the ->mode_set_base used
1035 * required by the CRTC helpers. The driver must provide the atomic plane helper
1036 * functions for the primary plane.
1037 *
1038 * This is a transitional helper useful for converting drivers to the atomic
1039 * interfaces.
1040 */
1041int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
1042 struct drm_framebuffer *old_fb)
1043{
1044 struct drm_plane_state *plane_state;
1045 struct drm_plane *plane = crtc->primary;
1046
1047 if (plane->funcs->atomic_duplicate_state)
1048 plane_state = plane->funcs->atomic_duplicate_state(plane);
1049 else {
1050 if (!plane->state)
1051 drm_atomic_helper_plane_reset(plane);
1052
1053 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
1054 }
1055 if (!plane_state)
1056 return -ENOMEM;
1057 plane_state->plane = plane;
1058
1059 plane_state->crtc = crtc;
1060 drm_atomic_set_fb_for_plane(plane_state, crtc->primary->fb);
1061 plane_state->crtc_x = 0;
1062 plane_state->crtc_y = 0;
1063 plane_state->crtc_h = crtc->mode.vdisplay;
1064 plane_state->crtc_w = crtc->mode.hdisplay;
1065 plane_state->src_x = x << 16;
1066 plane_state->src_y = y << 16;
1067 plane_state->src_h = crtc->mode.vdisplay << 16;
1068 plane_state->src_w = crtc->mode.hdisplay << 16;
1069
1070 return drm_plane_helper_commit(plane, plane_state, old_fb);
1071}
1072EXPORT_SYMBOL(drm_helper_crtc_mode_set_base);