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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_crtc.h>
38#include <drm/drm_fourcc.h>
39#include <drm/drm_crtc_helper.h>
40#include <drm/drm_fb_helper.h>
41#include <drm/drm_edid.h>
42
43MODULE_AUTHOR("David Airlie, Jesse Barnes");
44MODULE_DESCRIPTION("DRM KMS helper");
45MODULE_LICENSE("GPL and additional rights");
46
47/**
48 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
49 * connector list
50 * @dev: drm device to operate on
51 *
52 * Some userspace presumes that the first connected connector is the main
53 * display, where it's supposed to display e.g. the login screen. For
54 * laptops, this should be the main panel. Use this function to sort all
55 * (eDP/LVDS) panels to the front of the connector list, instead of
56 * painstakingly trying to initialize them in the right order.
57 */
58void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
59{
60 struct drm_connector *connector, *tmp;
61 struct list_head panel_list;
62
63 INIT_LIST_HEAD(&panel_list);
64
65 list_for_each_entry_safe(connector, tmp,
66 &dev->mode_config.connector_list, head) {
67 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
68 connector->connector_type == DRM_MODE_CONNECTOR_eDP)
69 list_move_tail(&connector->head, &panel_list);
70 }
71
72 list_splice(&panel_list, &dev->mode_config.connector_list);
73}
74EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
75
76/**
77 * drm_helper_encoder_in_use - check if a given encoder is in use
78 * @encoder: encoder to check
79 *
80 * Checks whether @encoder is with the current mode setting output configuration
81 * in use by any connector. This doesn't mean that it is actually enabled since
82 * the DPMS state is tracked separately.
83 *
84 * Returns:
85 * True if @encoder is used, false otherwise.
86 */
87bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
88{
89 struct drm_connector *connector;
90 struct drm_device *dev = encoder->dev;
91
92 /*
93 * We can expect this mutex to be locked if we are not panicking.
94 * Locking is currently fubar in the panic handler.
95 */
96 if (!oops_in_progress)
97 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
98
99 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
100 if (connector->encoder == encoder)
101 return true;
102 return false;
103}
104EXPORT_SYMBOL(drm_helper_encoder_in_use);
105
106/**
107 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
108 * @crtc: CRTC to check
109 *
110 * Checks whether @crtc is with the current mode setting output configuration
111 * in use by any connector. This doesn't mean that it is actually enabled since
112 * the DPMS state is tracked separately.
113 *
114 * Returns:
115 * True if @crtc is used, false otherwise.
116 */
117bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
118{
119 struct drm_encoder *encoder;
120 struct drm_device *dev = crtc->dev;
121
122 /*
123 * We can expect this mutex to be locked if we are not panicking.
124 * Locking is currently fubar in the panic handler.
125 */
126 if (!oops_in_progress)
127 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
128
129 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
130 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
131 return true;
132 return false;
133}
134EXPORT_SYMBOL(drm_helper_crtc_in_use);
135
136static void
137drm_encoder_disable(struct drm_encoder *encoder)
138{
139 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
140
141 if (encoder->bridge)
142 encoder->bridge->funcs->disable(encoder->bridge);
143
144 if (encoder_funcs->disable)
145 (*encoder_funcs->disable)(encoder);
146 else
147 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
148
149 if (encoder->bridge)
150 encoder->bridge->funcs->post_disable(encoder->bridge);
151}
152
153static void __drm_helper_disable_unused_functions(struct drm_device *dev)
154{
155 struct drm_encoder *encoder;
156 struct drm_connector *connector;
157 struct drm_crtc *crtc;
158
159 drm_warn_on_modeset_not_all_locked(dev);
160
161 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
162 if (!connector->encoder)
163 continue;
164 }
165
166 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
167 if (!drm_helper_encoder_in_use(encoder)) {
168 drm_encoder_disable(encoder);
169 /* disconnector encoder from any connector */
170 encoder->crtc = NULL;
171 }
172 }
173
174 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
175 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
176 crtc->enabled = drm_helper_crtc_in_use(crtc);
177 if (!crtc->enabled) {
178 if (crtc_funcs->disable)
179 (*crtc_funcs->disable)(crtc);
180 else
181 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
182 crtc->primary->fb = NULL;
183 }
184 }
185}
186
187/**
188 * drm_helper_disable_unused_functions - disable unused objects
189 * @dev: DRM device
190 *
191 * This function walks through the entire mode setting configuration of @dev. It
192 * will remove any crtc links of unused encoders and encoder links of
193 * disconnected connectors. Then it will disable all unused encoders and crtcs
194 * either by calling their disable callback if available or by calling their
195 * dpms callback with DRM_MODE_DPMS_OFF.
196 */
197void drm_helper_disable_unused_functions(struct drm_device *dev)
198{
199 drm_modeset_lock_all(dev);
200 __drm_helper_disable_unused_functions(dev);
201 drm_modeset_unlock_all(dev);
202}
203EXPORT_SYMBOL(drm_helper_disable_unused_functions);
204
205/*
206 * Check the CRTC we're going to map each output to vs. its current
207 * CRTC. If they don't match, we have to disable the output and the CRTC
208 * since the driver will have to re-route things.
209 */
210static void
211drm_crtc_prepare_encoders(struct drm_device *dev)
212{
213 struct drm_encoder_helper_funcs *encoder_funcs;
214 struct drm_encoder *encoder;
215
216 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
217 encoder_funcs = encoder->helper_private;
218 /* Disable unused encoders */
219 if (encoder->crtc == NULL)
220 drm_encoder_disable(encoder);
221 /* Disable encoders whose CRTC is about to change */
222 if (encoder_funcs->get_crtc &&
223 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
224 drm_encoder_disable(encoder);
225 }
226}
227
228/**
229 * drm_crtc_helper_set_mode - internal helper to set a mode
230 * @crtc: CRTC to program
231 * @mode: mode to use
232 * @x: horizontal offset into the surface
233 * @y: vertical offset into the surface
234 * @old_fb: old framebuffer, for cleanup
235 *
236 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
237 * to fixup or reject the mode prior to trying to set it. This is an internal
238 * helper that drivers could e.g. use to update properties that require the
239 * entire output pipe to be disabled and re-enabled in a new configuration. For
240 * example for changing whether audio is enabled on a hdmi link or for changing
241 * panel fitter or dither attributes. It is also called by the
242 * drm_crtc_helper_set_config() helper function to drive the mode setting
243 * sequence.
244 *
245 * Returns:
246 * True if the mode was set successfully, false otherwise.
247 */
248bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
249 struct drm_display_mode *mode,
250 int x, int y,
251 struct drm_framebuffer *old_fb)
252{
253 struct drm_device *dev = crtc->dev;
254 struct drm_display_mode *adjusted_mode, saved_mode;
255 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
256 struct drm_encoder_helper_funcs *encoder_funcs;
257 int saved_x, saved_y;
258 bool saved_enabled;
259 struct drm_encoder *encoder;
260 bool ret = true;
261
262 drm_warn_on_modeset_not_all_locked(dev);
263
264 saved_enabled = crtc->enabled;
265 crtc->enabled = drm_helper_crtc_in_use(crtc);
266 if (!crtc->enabled)
267 return true;
268
269 adjusted_mode = drm_mode_duplicate(dev, mode);
270 if (!adjusted_mode) {
271 crtc->enabled = saved_enabled;
272 return false;
273 }
274
275 saved_mode = crtc->mode;
276 saved_x = crtc->x;
277 saved_y = crtc->y;
278
279 /* Update crtc values up front so the driver can rely on them for mode
280 * setting.
281 */
282 crtc->mode = *mode;
283 crtc->x = x;
284 crtc->y = y;
285
286 /* Pass our mode to the connectors and the CRTC to give them a chance to
287 * adjust it according to limitations or connector properties, and also
288 * a chance to reject the mode entirely.
289 */
290 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
291
292 if (encoder->crtc != crtc)
293 continue;
294
295 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
296 ret = encoder->bridge->funcs->mode_fixup(
297 encoder->bridge, mode, adjusted_mode);
298 if (!ret) {
299 DRM_DEBUG_KMS("Bridge fixup failed\n");
300 goto done;
301 }
302 }
303
304 encoder_funcs = encoder->helper_private;
305 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
306 adjusted_mode))) {
307 DRM_DEBUG_KMS("Encoder fixup failed\n");
308 goto done;
309 }
310 }
311
312 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
313 DRM_DEBUG_KMS("CRTC fixup failed\n");
314 goto done;
315 }
316 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
317
318 /* Prepare the encoders and CRTCs before setting the mode. */
319 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
320
321 if (encoder->crtc != crtc)
322 continue;
323
324 if (encoder->bridge)
325 encoder->bridge->funcs->disable(encoder->bridge);
326
327 encoder_funcs = encoder->helper_private;
328 /* Disable the encoders as the first thing we do. */
329 encoder_funcs->prepare(encoder);
330
331 if (encoder->bridge)
332 encoder->bridge->funcs->post_disable(encoder->bridge);
333 }
334
335 drm_crtc_prepare_encoders(dev);
336
337 crtc_funcs->prepare(crtc);
338
339 /* Set up the DPLL and any encoders state that needs to adjust or depend
340 * on the DPLL.
341 */
342 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
343 if (!ret)
344 goto done;
345
346 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
347
348 if (encoder->crtc != crtc)
349 continue;
350
351 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
352 encoder->base.id, drm_get_encoder_name(encoder),
353 mode->base.id, mode->name);
354 encoder_funcs = encoder->helper_private;
355 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
356
357 if (encoder->bridge && encoder->bridge->funcs->mode_set)
358 encoder->bridge->funcs->mode_set(encoder->bridge, mode,
359 adjusted_mode);
360 }
361
362 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
363 crtc_funcs->commit(crtc);
364
365 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
366
367 if (encoder->crtc != crtc)
368 continue;
369
370 if (encoder->bridge)
371 encoder->bridge->funcs->pre_enable(encoder->bridge);
372
373 encoder_funcs = encoder->helper_private;
374 encoder_funcs->commit(encoder);
375
376 if (encoder->bridge)
377 encoder->bridge->funcs->enable(encoder->bridge);
378 }
379
380 /* Store real post-adjustment hardware mode. */
381 crtc->hwmode = *adjusted_mode;
382
383 /* Calculate and store various constants which
384 * are later needed by vblank and swap-completion
385 * timestamping. They are derived from true hwmode.
386 */
387 drm_calc_timestamping_constants(crtc, &crtc->hwmode);
388
389 /* FIXME: add subpixel order */
390done:
391 drm_mode_destroy(dev, adjusted_mode);
392 if (!ret) {
393 crtc->enabled = saved_enabled;
394 crtc->mode = saved_mode;
395 crtc->x = saved_x;
396 crtc->y = saved_y;
397 }
398
399 return ret;
400}
401EXPORT_SYMBOL(drm_crtc_helper_set_mode);
402
403
404static int
405drm_crtc_helper_disable(struct drm_crtc *crtc)
406{
407 struct drm_device *dev = crtc->dev;
408 struct drm_connector *connector;
409 struct drm_encoder *encoder;
410
411 /* Decouple all encoders and their attached connectors from this crtc */
412 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
413 if (encoder->crtc != crtc)
414 continue;
415
416 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
417 if (connector->encoder != encoder)
418 continue;
419
420 connector->encoder = NULL;
421
422 /*
423 * drm_helper_disable_unused_functions() ought to be
424 * doing this, but since we've decoupled the encoder
425 * from the connector above, the required connection
426 * between them is henceforth no longer available.
427 */
428 connector->dpms = DRM_MODE_DPMS_OFF;
429 }
430 }
431
432 __drm_helper_disable_unused_functions(dev);
433 return 0;
434}
435
436/**
437 * drm_crtc_helper_set_config - set a new config from userspace
438 * @set: mode set configuration
439 *
440 * Setup a new configuration, provided by the upper layers (either an ioctl call
441 * from userspace or internally e.g. from the fbdev support code) in @set, and
442 * enable it. This is the main helper functions for drivers that implement
443 * kernel mode setting with the crtc helper functions and the assorted
444 * ->prepare(), ->modeset() and ->commit() helper callbacks.
445 *
446 * Returns:
447 * Returns 0 on success, negative errno numbers on failure.
448 */
449int drm_crtc_helper_set_config(struct drm_mode_set *set)
450{
451 struct drm_device *dev;
452 struct drm_crtc *new_crtc;
453 struct drm_encoder *save_encoders, *new_encoder, *encoder;
454 bool mode_changed = false; /* if true do a full mode set */
455 bool fb_changed = false; /* if true and !mode_changed just do a flip */
456 struct drm_connector *save_connectors, *connector;
457 int count = 0, ro, fail = 0;
458 struct drm_crtc_helper_funcs *crtc_funcs;
459 struct drm_mode_set save_set;
460 int ret;
461 int i;
462
463 DRM_DEBUG_KMS("\n");
464
465 BUG_ON(!set);
466 BUG_ON(!set->crtc);
467 BUG_ON(!set->crtc->helper_private);
468
469 /* Enforce sane interface api - has been abused by the fb helper. */
470 BUG_ON(!set->mode && set->fb);
471 BUG_ON(set->fb && set->num_connectors == 0);
472
473 crtc_funcs = set->crtc->helper_private;
474
475 if (!set->mode)
476 set->fb = NULL;
477
478 if (set->fb) {
479 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
480 set->crtc->base.id, set->fb->base.id,
481 (int)set->num_connectors, set->x, set->y);
482 } else {
483 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
484 return drm_crtc_helper_disable(set->crtc);
485 }
486
487 dev = set->crtc->dev;
488
489 drm_warn_on_modeset_not_all_locked(dev);
490
491 /*
492 * Allocate space for the backup of all (non-pointer) encoder and
493 * connector data.
494 */
495 save_encoders = kzalloc(dev->mode_config.num_encoder *
496 sizeof(struct drm_encoder), GFP_KERNEL);
497 if (!save_encoders)
498 return -ENOMEM;
499
500 save_connectors = kzalloc(dev->mode_config.num_connector *
501 sizeof(struct drm_connector), GFP_KERNEL);
502 if (!save_connectors) {
503 kfree(save_encoders);
504 return -ENOMEM;
505 }
506
507 /*
508 * Copy data. Note that driver private data is not affected.
509 * Should anything bad happen only the expected state is
510 * restored, not the drivers personal bookkeeping.
511 */
512 count = 0;
513 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
514 save_encoders[count++] = *encoder;
515 }
516
517 count = 0;
518 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
519 save_connectors[count++] = *connector;
520 }
521
522 save_set.crtc = set->crtc;
523 save_set.mode = &set->crtc->mode;
524 save_set.x = set->crtc->x;
525 save_set.y = set->crtc->y;
526 save_set.fb = set->crtc->primary->fb;
527
528 /* We should be able to check here if the fb has the same properties
529 * and then just flip_or_move it */
530 if (set->crtc->primary->fb != set->fb) {
531 /* If we have no fb then treat it as a full mode set */
532 if (set->crtc->primary->fb == NULL) {
533 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
534 mode_changed = true;
535 } else if (set->fb == NULL) {
536 mode_changed = true;
537 } else if (set->fb->pixel_format !=
538 set->crtc->primary->fb->pixel_format) {
539 mode_changed = true;
540 } else
541 fb_changed = true;
542 }
543
544 if (set->x != set->crtc->x || set->y != set->crtc->y)
545 fb_changed = true;
546
547 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
548 DRM_DEBUG_KMS("modes are different, full mode set\n");
549 drm_mode_debug_printmodeline(&set->crtc->mode);
550 drm_mode_debug_printmodeline(set->mode);
551 mode_changed = true;
552 }
553
554 /* a) traverse passed in connector list and get encoders for them */
555 count = 0;
556 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
557 struct drm_connector_helper_funcs *connector_funcs =
558 connector->helper_private;
559 new_encoder = connector->encoder;
560 for (ro = 0; ro < set->num_connectors; ro++) {
561 if (set->connectors[ro] == connector) {
562 new_encoder = connector_funcs->best_encoder(connector);
563 /* if we can't get an encoder for a connector
564 we are setting now - then fail */
565 if (new_encoder == NULL)
566 /* don't break so fail path works correct */
567 fail = 1;
568
569 if (connector->dpms != DRM_MODE_DPMS_ON) {
570 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
571 mode_changed = true;
572 }
573
574 break;
575 }
576 }
577
578 if (new_encoder != connector->encoder) {
579 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
580 mode_changed = true;
581 /* If the encoder is reused for another connector, then
582 * the appropriate crtc will be set later.
583 */
584 if (connector->encoder)
585 connector->encoder->crtc = NULL;
586 connector->encoder = new_encoder;
587 }
588 }
589
590 if (fail) {
591 ret = -EINVAL;
592 goto fail;
593 }
594
595 count = 0;
596 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
597 if (!connector->encoder)
598 continue;
599
600 if (connector->encoder->crtc == set->crtc)
601 new_crtc = NULL;
602 else
603 new_crtc = connector->encoder->crtc;
604
605 for (ro = 0; ro < set->num_connectors; ro++) {
606 if (set->connectors[ro] == connector)
607 new_crtc = set->crtc;
608 }
609
610 /* Make sure the new CRTC will work with the encoder */
611 if (new_crtc &&
612 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
613 ret = -EINVAL;
614 goto fail;
615 }
616 if (new_crtc != connector->encoder->crtc) {
617 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
618 mode_changed = true;
619 connector->encoder->crtc = new_crtc;
620 }
621 if (new_crtc) {
622 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
623 connector->base.id, drm_get_connector_name(connector),
624 new_crtc->base.id);
625 } else {
626 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
627 connector->base.id, drm_get_connector_name(connector));
628 }
629 }
630
631 /* mode_set_base is not a required function */
632 if (fb_changed && !crtc_funcs->mode_set_base)
633 mode_changed = true;
634
635 if (mode_changed) {
636 if (drm_helper_crtc_in_use(set->crtc)) {
637 DRM_DEBUG_KMS("attempting to set mode from"
638 " userspace\n");
639 drm_mode_debug_printmodeline(set->mode);
640 set->crtc->primary->fb = set->fb;
641 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
642 set->x, set->y,
643 save_set.fb)) {
644 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
645 set->crtc->base.id);
646 set->crtc->primary->fb = save_set.fb;
647 ret = -EINVAL;
648 goto fail;
649 }
650 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
651 for (i = 0; i < set->num_connectors; i++) {
652 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
653 drm_get_connector_name(set->connectors[i]));
654 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
655 }
656 }
657 __drm_helper_disable_unused_functions(dev);
658 } else if (fb_changed) {
659 set->crtc->x = set->x;
660 set->crtc->y = set->y;
661 set->crtc->primary->fb = set->fb;
662 ret = crtc_funcs->mode_set_base(set->crtc,
663 set->x, set->y, save_set.fb);
664 if (ret != 0) {
665 set->crtc->x = save_set.x;
666 set->crtc->y = save_set.y;
667 set->crtc->primary->fb = save_set.fb;
668 goto fail;
669 }
670 }
671
672 kfree(save_connectors);
673 kfree(save_encoders);
674 return 0;
675
676fail:
677 /* Restore all previous data. */
678 count = 0;
679 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
680 *encoder = save_encoders[count++];
681 }
682
683 count = 0;
684 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
685 *connector = save_connectors[count++];
686 }
687
688 /* Try to restore the config */
689 if (mode_changed &&
690 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
691 save_set.y, save_set.fb))
692 DRM_ERROR("failed to restore config after modeset failure\n");
693
694 kfree(save_connectors);
695 kfree(save_encoders);
696 return ret;
697}
698EXPORT_SYMBOL(drm_crtc_helper_set_config);
699
700static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
701{
702 int dpms = DRM_MODE_DPMS_OFF;
703 struct drm_connector *connector;
704 struct drm_device *dev = encoder->dev;
705
706 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
707 if (connector->encoder == encoder)
708 if (connector->dpms < dpms)
709 dpms = connector->dpms;
710 return dpms;
711}
712
713/* Helper which handles bridge ordering around encoder dpms */
714static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
715{
716 struct drm_bridge *bridge = encoder->bridge;
717 struct drm_encoder_helper_funcs *encoder_funcs;
718
719 if (bridge) {
720 if (mode == DRM_MODE_DPMS_ON)
721 bridge->funcs->pre_enable(bridge);
722 else
723 bridge->funcs->disable(bridge);
724 }
725
726 encoder_funcs = encoder->helper_private;
727 if (encoder_funcs->dpms)
728 encoder_funcs->dpms(encoder, mode);
729
730 if (bridge) {
731 if (mode == DRM_MODE_DPMS_ON)
732 bridge->funcs->enable(bridge);
733 else
734 bridge->funcs->post_disable(bridge);
735 }
736}
737
738static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
739{
740 int dpms = DRM_MODE_DPMS_OFF;
741 struct drm_connector *connector;
742 struct drm_device *dev = crtc->dev;
743
744 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
745 if (connector->encoder && connector->encoder->crtc == crtc)
746 if (connector->dpms < dpms)
747 dpms = connector->dpms;
748 return dpms;
749}
750
751/**
752 * drm_helper_connector_dpms() - connector dpms helper implementation
753 * @connector: affected connector
754 * @mode: DPMS mode
755 *
756 * This is the main helper function provided by the crtc helper framework for
757 * implementing the DPMS connector attribute. It computes the new desired DPMS
758 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
759 * callback provided by the driver appropriately.
760 */
761void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
762{
763 struct drm_encoder *encoder = connector->encoder;
764 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
765 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
766
767 if (mode == connector->dpms)
768 return;
769
770 old_dpms = connector->dpms;
771 connector->dpms = mode;
772
773 if (encoder)
774 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
775
776 /* from off to on, do crtc then encoder */
777 if (mode < old_dpms) {
778 if (crtc) {
779 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
780 if (crtc_funcs->dpms)
781 (*crtc_funcs->dpms) (crtc,
782 drm_helper_choose_crtc_dpms(crtc));
783 }
784 if (encoder)
785 drm_helper_encoder_dpms(encoder, encoder_dpms);
786 }
787
788 /* from on to off, do encoder then crtc */
789 if (mode > old_dpms) {
790 if (encoder)
791 drm_helper_encoder_dpms(encoder, encoder_dpms);
792 if (crtc) {
793 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
794 if (crtc_funcs->dpms)
795 (*crtc_funcs->dpms) (crtc,
796 drm_helper_choose_crtc_dpms(crtc));
797 }
798 }
799
800 return;
801}
802EXPORT_SYMBOL(drm_helper_connector_dpms);
803
804/**
805 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
806 * @fb: drm_framebuffer object to fill out
807 * @mode_cmd: metadata from the userspace fb creation request
808 *
809 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
810 * metadata fields.
811 */
812void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
813 struct drm_mode_fb_cmd2 *mode_cmd)
814{
815 int i;
816
817 fb->width = mode_cmd->width;
818 fb->height = mode_cmd->height;
819 for (i = 0; i < 4; i++) {
820 fb->pitches[i] = mode_cmd->pitches[i];
821 fb->offsets[i] = mode_cmd->offsets[i];
822 }
823 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
824 &fb->bits_per_pixel);
825 fb->pixel_format = mode_cmd->pixel_format;
826}
827EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
828
829/**
830 * drm_helper_resume_force_mode - force-restore mode setting configuration
831 * @dev: drm_device which should be restored
832 *
833 * Drivers which use the mode setting helpers can use this function to
834 * force-restore the mode setting configuration e.g. on resume or when something
835 * else might have trampled over the hw state (like some overzealous old BIOSen
836 * tended to do).
837 *
838 * This helper doesn't provide a error return value since restoring the old
839 * config should never fail due to resource allocation issues since the driver
840 * has successfully set the restored configuration already. Hence this should
841 * boil down to the equivalent of a few dpms on calls, which also don't provide
842 * an error code.
843 *
844 * Drivers where simply restoring an old configuration again might fail (e.g.
845 * due to slight differences in allocating shared resources when the
846 * configuration is restored in a different order than when userspace set it up)
847 * need to use their own restore logic.
848 */
849void drm_helper_resume_force_mode(struct drm_device *dev)
850{
851 struct drm_crtc *crtc;
852 struct drm_encoder *encoder;
853 struct drm_crtc_helper_funcs *crtc_funcs;
854 int encoder_dpms;
855 bool ret;
856
857 drm_modeset_lock_all(dev);
858 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
859
860 if (!crtc->enabled)
861 continue;
862
863 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
864 crtc->x, crtc->y, crtc->primary->fb);
865
866 /* Restoring the old config should never fail! */
867 if (ret == false)
868 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
869
870 /* Turn off outputs that were already powered off */
871 if (drm_helper_choose_crtc_dpms(crtc)) {
872 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
873
874 if(encoder->crtc != crtc)
875 continue;
876
877 encoder_dpms = drm_helper_choose_encoder_dpms(
878 encoder);
879
880 drm_helper_encoder_dpms(encoder, encoder_dpms);
881 }
882
883 crtc_funcs = crtc->helper_private;
884 if (crtc_funcs->dpms)
885 (*crtc_funcs->dpms) (crtc,
886 drm_helper_choose_crtc_dpms(crtc));
887 }
888 }
889
890 /* disable the unused connectors while restoring the modesetting */
891 __drm_helper_disable_unused_functions(dev);
892 drm_modeset_unlock_all(dev);
893}
894EXPORT_SYMBOL(drm_helper_resume_force_mode);