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