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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 "drmP.h"
33#include "drm_crtc.h"
34#include "drm_crtc_helper.h"
35#include "drm_fb_helper.h"
36
37static bool drm_kms_helper_poll = true;
38module_param_named(poll, drm_kms_helper_poll, bool, 0600);
39
40static void drm_mode_validate_flag(struct drm_connector *connector,
41 int flags)
42{
43 struct drm_display_mode *mode, *t;
44
45 if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
46 return;
47
48 list_for_each_entry_safe(mode, t, &connector->modes, head) {
49 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
50 !(flags & DRM_MODE_FLAG_INTERLACE))
51 mode->status = MODE_NO_INTERLACE;
52 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
53 !(flags & DRM_MODE_FLAG_DBLSCAN))
54 mode->status = MODE_NO_DBLESCAN;
55 }
56
57 return;
58}
59
60/**
61 * drm_helper_probe_single_connector_modes - get complete set of display modes
62 * @dev: DRM device
63 * @maxX: max width for modes
64 * @maxY: max height for modes
65 *
66 * LOCKING:
67 * Caller must hold mode config lock.
68 *
69 * Based on @dev's mode_config layout, scan all the connectors and try to detect
70 * modes on them. Modes will first be added to the connector's probed_modes
71 * list, then culled (based on validity and the @maxX, @maxY parameters) and
72 * put into the normal modes list.
73 *
74 * Intended to be used either at bootup time or when major configuration
75 * changes have occurred.
76 *
77 * FIXME: take into account monitor limits
78 *
79 * RETURNS:
80 * Number of modes found on @connector.
81 */
82int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
83 uint32_t maxX, uint32_t maxY)
84{
85 struct drm_device *dev = connector->dev;
86 struct drm_display_mode *mode, *t;
87 struct drm_connector_helper_funcs *connector_funcs =
88 connector->helper_private;
89 int count = 0;
90 int mode_flags = 0;
91
92 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
93 drm_get_connector_name(connector));
94 /* set all modes to the unverified state */
95 list_for_each_entry_safe(mode, t, &connector->modes, head)
96 mode->status = MODE_UNVERIFIED;
97
98 if (connector->force) {
99 if (connector->force == DRM_FORCE_ON)
100 connector->status = connector_status_connected;
101 else
102 connector->status = connector_status_disconnected;
103 if (connector->funcs->force)
104 connector->funcs->force(connector);
105 } else {
106 connector->status = connector->funcs->detect(connector, true);
107 drm_kms_helper_poll_enable(dev);
108 }
109
110 if (connector->status == connector_status_disconnected) {
111 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
112 connector->base.id, drm_get_connector_name(connector));
113 drm_mode_connector_update_edid_property(connector, NULL);
114 goto prune;
115 }
116
117 count = (*connector_funcs->get_modes)(connector);
118 if (count == 0 && connector->status == connector_status_connected)
119 count = drm_add_modes_noedid(connector, 1024, 768);
120 if (count == 0)
121 goto prune;
122
123 drm_mode_connector_list_update(connector);
124
125 if (maxX && maxY)
126 drm_mode_validate_size(dev, &connector->modes, maxX,
127 maxY, 0);
128
129 if (connector->interlace_allowed)
130 mode_flags |= DRM_MODE_FLAG_INTERLACE;
131 if (connector->doublescan_allowed)
132 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
133 drm_mode_validate_flag(connector, mode_flags);
134
135 list_for_each_entry_safe(mode, t, &connector->modes, head) {
136 if (mode->status == MODE_OK)
137 mode->status = connector_funcs->mode_valid(connector,
138 mode);
139 }
140
141prune:
142 drm_mode_prune_invalid(dev, &connector->modes, true);
143
144 if (list_empty(&connector->modes))
145 return 0;
146
147 drm_mode_sort(&connector->modes);
148
149 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
150 drm_get_connector_name(connector));
151 list_for_each_entry_safe(mode, t, &connector->modes, head) {
152 mode->vrefresh = drm_mode_vrefresh(mode);
153
154 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
155 drm_mode_debug_printmodeline(mode);
156 }
157
158 return count;
159}
160EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
161
162/**
163 * drm_helper_encoder_in_use - check if a given encoder is in use
164 * @encoder: encoder to check
165 *
166 * LOCKING:
167 * Caller must hold mode config lock.
168 *
169 * Walk @encoders's DRM device's mode_config and see if it's in use.
170 *
171 * RETURNS:
172 * True if @encoder is part of the mode_config, false otherwise.
173 */
174bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
175{
176 struct drm_connector *connector;
177 struct drm_device *dev = encoder->dev;
178 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
179 if (connector->encoder == encoder)
180 return true;
181 return false;
182}
183EXPORT_SYMBOL(drm_helper_encoder_in_use);
184
185/**
186 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
187 * @crtc: CRTC to check
188 *
189 * LOCKING:
190 * Caller must hold mode config lock.
191 *
192 * Walk @crtc's DRM device's mode_config and see if it's in use.
193 *
194 * RETURNS:
195 * True if @crtc is part of the mode_config, false otherwise.
196 */
197bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
198{
199 struct drm_encoder *encoder;
200 struct drm_device *dev = crtc->dev;
201 /* FIXME: Locking around list access? */
202 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
203 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
204 return true;
205 return false;
206}
207EXPORT_SYMBOL(drm_helper_crtc_in_use);
208
209static void
210drm_encoder_disable(struct drm_encoder *encoder)
211{
212 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
213
214 if (encoder_funcs->disable)
215 (*encoder_funcs->disable)(encoder);
216 else
217 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
218}
219
220/**
221 * drm_helper_disable_unused_functions - disable unused objects
222 * @dev: DRM device
223 *
224 * LOCKING:
225 * Caller must hold mode config lock.
226 *
227 * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
228 * by calling its dpms function, which should power it off.
229 */
230void drm_helper_disable_unused_functions(struct drm_device *dev)
231{
232 struct drm_encoder *encoder;
233 struct drm_connector *connector;
234 struct drm_crtc *crtc;
235
236 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
237 if (!connector->encoder)
238 continue;
239 if (connector->status == connector_status_disconnected)
240 connector->encoder = NULL;
241 }
242
243 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
244 if (!drm_helper_encoder_in_use(encoder)) {
245 drm_encoder_disable(encoder);
246 /* disconnector encoder from any connector */
247 encoder->crtc = NULL;
248 }
249 }
250
251 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
252 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
253 crtc->enabled = drm_helper_crtc_in_use(crtc);
254 if (!crtc->enabled) {
255 if (crtc_funcs->disable)
256 (*crtc_funcs->disable)(crtc);
257 else
258 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
259 crtc->fb = NULL;
260 }
261 }
262}
263EXPORT_SYMBOL(drm_helper_disable_unused_functions);
264
265/**
266 * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
267 * @encoder: encoder to test
268 * @crtc: crtc to test
269 *
270 * Return false if @encoder can't be driven by @crtc, true otherwise.
271 */
272static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
273 struct drm_crtc *crtc)
274{
275 struct drm_device *dev;
276 struct drm_crtc *tmp;
277 int crtc_mask = 1;
278
279 WARN(!crtc, "checking null crtc?\n");
280
281 dev = crtc->dev;
282
283 list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
284 if (tmp == crtc)
285 break;
286 crtc_mask <<= 1;
287 }
288
289 if (encoder->possible_crtcs & crtc_mask)
290 return true;
291 return false;
292}
293
294/*
295 * Check the CRTC we're going to map each output to vs. its current
296 * CRTC. If they don't match, we have to disable the output and the CRTC
297 * since the driver will have to re-route things.
298 */
299static void
300drm_crtc_prepare_encoders(struct drm_device *dev)
301{
302 struct drm_encoder_helper_funcs *encoder_funcs;
303 struct drm_encoder *encoder;
304
305 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
306 encoder_funcs = encoder->helper_private;
307 /* Disable unused encoders */
308 if (encoder->crtc == NULL)
309 drm_encoder_disable(encoder);
310 /* Disable encoders whose CRTC is about to change */
311 if (encoder_funcs->get_crtc &&
312 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
313 drm_encoder_disable(encoder);
314 }
315}
316
317/**
318 * drm_crtc_set_mode - set a mode
319 * @crtc: CRTC to program
320 * @mode: mode to use
321 * @x: width of mode
322 * @y: height of mode
323 *
324 * LOCKING:
325 * Caller must hold mode config lock.
326 *
327 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
328 * to fixup or reject the mode prior to trying to set it.
329 *
330 * RETURNS:
331 * True if the mode was set successfully, or false otherwise.
332 */
333bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
334 struct drm_display_mode *mode,
335 int x, int y,
336 struct drm_framebuffer *old_fb)
337{
338 struct drm_device *dev = crtc->dev;
339 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
340 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
341 struct drm_encoder_helper_funcs *encoder_funcs;
342 int saved_x, saved_y;
343 struct drm_encoder *encoder;
344 bool ret = true;
345
346 crtc->enabled = drm_helper_crtc_in_use(crtc);
347 if (!crtc->enabled)
348 return true;
349
350 adjusted_mode = drm_mode_duplicate(dev, mode);
351
352 saved_hwmode = crtc->hwmode;
353 saved_mode = crtc->mode;
354 saved_x = crtc->x;
355 saved_y = crtc->y;
356
357 /* Update crtc values up front so the driver can rely on them for mode
358 * setting.
359 */
360 crtc->mode = *mode;
361 crtc->x = x;
362 crtc->y = y;
363
364 /* Pass our mode to the connectors and the CRTC to give them a chance to
365 * adjust it according to limitations or connector properties, and also
366 * a chance to reject the mode entirely.
367 */
368 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
369
370 if (encoder->crtc != crtc)
371 continue;
372 encoder_funcs = encoder->helper_private;
373 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
374 adjusted_mode))) {
375 goto done;
376 }
377 }
378
379 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
380 goto done;
381 }
382 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
383
384 /* Prepare the encoders and CRTCs before setting the mode. */
385 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
386
387 if (encoder->crtc != crtc)
388 continue;
389 encoder_funcs = encoder->helper_private;
390 /* Disable the encoders as the first thing we do. */
391 encoder_funcs->prepare(encoder);
392 }
393
394 drm_crtc_prepare_encoders(dev);
395
396 crtc_funcs->prepare(crtc);
397
398 /* Set up the DPLL and any encoders state that needs to adjust or depend
399 * on the DPLL.
400 */
401 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
402 if (!ret)
403 goto done;
404
405 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
406
407 if (encoder->crtc != crtc)
408 continue;
409
410 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
411 encoder->base.id, drm_get_encoder_name(encoder),
412 mode->base.id, mode->name);
413 encoder_funcs = encoder->helper_private;
414 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
415 }
416
417 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
418 crtc_funcs->commit(crtc);
419
420 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
421
422 if (encoder->crtc != crtc)
423 continue;
424
425 encoder_funcs = encoder->helper_private;
426 encoder_funcs->commit(encoder);
427
428 }
429
430 /* Store real post-adjustment hardware mode. */
431 crtc->hwmode = *adjusted_mode;
432
433 /* Calculate and store various constants which
434 * are later needed by vblank and swap-completion
435 * timestamping. They are derived from true hwmode.
436 */
437 drm_calc_timestamping_constants(crtc);
438
439 /* FIXME: add subpixel order */
440done:
441 drm_mode_destroy(dev, adjusted_mode);
442 if (!ret) {
443 crtc->hwmode = saved_hwmode;
444 crtc->mode = saved_mode;
445 crtc->x = saved_x;
446 crtc->y = saved_y;
447 }
448
449 return ret;
450}
451EXPORT_SYMBOL(drm_crtc_helper_set_mode);
452
453
454/**
455 * drm_crtc_helper_set_config - set a new config from userspace
456 * @crtc: CRTC to setup
457 * @crtc_info: user provided configuration
458 * @new_mode: new mode to set
459 * @connector_set: set of connectors for the new config
460 * @fb: new framebuffer
461 *
462 * LOCKING:
463 * Caller must hold mode config lock.
464 *
465 * Setup a new configuration, provided by the user in @crtc_info, and enable
466 * it.
467 *
468 * RETURNS:
469 * Zero. (FIXME)
470 */
471int drm_crtc_helper_set_config(struct drm_mode_set *set)
472{
473 struct drm_device *dev;
474 struct drm_crtc *save_crtcs, *new_crtc, *crtc;
475 struct drm_encoder *save_encoders, *new_encoder, *encoder;
476 struct drm_framebuffer *old_fb = NULL;
477 bool mode_changed = false; /* if true do a full mode set */
478 bool fb_changed = false; /* if true and !mode_changed just do a flip */
479 struct drm_connector *save_connectors, *connector;
480 int count = 0, ro, fail = 0;
481 struct drm_crtc_helper_funcs *crtc_funcs;
482 int ret = 0;
483 int i;
484
485 DRM_DEBUG_KMS("\n");
486
487 if (!set)
488 return -EINVAL;
489
490 if (!set->crtc)
491 return -EINVAL;
492
493 if (!set->crtc->helper_private)
494 return -EINVAL;
495
496 crtc_funcs = set->crtc->helper_private;
497
498 if (!set->mode)
499 set->fb = NULL;
500
501 if (set->fb) {
502 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
503 set->crtc->base.id, set->fb->base.id,
504 (int)set->num_connectors, set->x, set->y);
505 } else {
506 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
507 set->mode = NULL;
508 set->num_connectors = 0;
509 }
510
511 dev = set->crtc->dev;
512
513 /* Allocate space for the backup of all (non-pointer) crtc, encoder and
514 * connector data. */
515 save_crtcs = kzalloc(dev->mode_config.num_crtc *
516 sizeof(struct drm_crtc), GFP_KERNEL);
517 if (!save_crtcs)
518 return -ENOMEM;
519
520 save_encoders = kzalloc(dev->mode_config.num_encoder *
521 sizeof(struct drm_encoder), GFP_KERNEL);
522 if (!save_encoders) {
523 kfree(save_crtcs);
524 return -ENOMEM;
525 }
526
527 save_connectors = kzalloc(dev->mode_config.num_connector *
528 sizeof(struct drm_connector), GFP_KERNEL);
529 if (!save_connectors) {
530 kfree(save_crtcs);
531 kfree(save_encoders);
532 return -ENOMEM;
533 }
534
535 /* Copy data. Note that driver private data is not affected.
536 * Should anything bad happen only the expected state is
537 * restored, not the drivers personal bookkeeping.
538 */
539 count = 0;
540 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
541 save_crtcs[count++] = *crtc;
542 }
543
544 count = 0;
545 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
546 save_encoders[count++] = *encoder;
547 }
548
549 count = 0;
550 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
551 save_connectors[count++] = *connector;
552 }
553
554 /* We should be able to check here if the fb has the same properties
555 * and then just flip_or_move it */
556 if (set->crtc->fb != set->fb) {
557 /* If we have no fb then treat it as a full mode set */
558 if (set->crtc->fb == NULL) {
559 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
560 mode_changed = true;
561 } else if (set->fb == NULL) {
562 mode_changed = true;
563 } else if (set->fb->depth != set->crtc->fb->depth) {
564 mode_changed = true;
565 } else if (set->fb->bits_per_pixel !=
566 set->crtc->fb->bits_per_pixel) {
567 mode_changed = true;
568 } else
569 fb_changed = true;
570 }
571
572 if (set->x != set->crtc->x || set->y != set->crtc->y)
573 fb_changed = true;
574
575 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
576 DRM_DEBUG_KMS("modes are different, full mode set\n");
577 drm_mode_debug_printmodeline(&set->crtc->mode);
578 drm_mode_debug_printmodeline(set->mode);
579 mode_changed = true;
580 }
581
582 /* a) traverse passed in connector list and get encoders for them */
583 count = 0;
584 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
585 struct drm_connector_helper_funcs *connector_funcs =
586 connector->helper_private;
587 new_encoder = connector->encoder;
588 for (ro = 0; ro < set->num_connectors; ro++) {
589 if (set->connectors[ro] == connector) {
590 new_encoder = connector_funcs->best_encoder(connector);
591 /* if we can't get an encoder for a connector
592 we are setting now - then fail */
593 if (new_encoder == NULL)
594 /* don't break so fail path works correct */
595 fail = 1;
596 break;
597 }
598 }
599
600 if (new_encoder != connector->encoder) {
601 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
602 mode_changed = true;
603 /* If the encoder is reused for another connector, then
604 * the appropriate crtc will be set later.
605 */
606 if (connector->encoder)
607 connector->encoder->crtc = NULL;
608 connector->encoder = new_encoder;
609 }
610 }
611
612 if (fail) {
613 ret = -EINVAL;
614 goto fail;
615 }
616
617 count = 0;
618 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
619 if (!connector->encoder)
620 continue;
621
622 if (connector->encoder->crtc == set->crtc)
623 new_crtc = NULL;
624 else
625 new_crtc = connector->encoder->crtc;
626
627 for (ro = 0; ro < set->num_connectors; ro++) {
628 if (set->connectors[ro] == connector)
629 new_crtc = set->crtc;
630 }
631
632 /* Make sure the new CRTC will work with the encoder */
633 if (new_crtc &&
634 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
635 ret = -EINVAL;
636 goto fail;
637 }
638 if (new_crtc != connector->encoder->crtc) {
639 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
640 mode_changed = true;
641 connector->encoder->crtc = new_crtc;
642 }
643 if (new_crtc) {
644 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
645 connector->base.id, drm_get_connector_name(connector),
646 new_crtc->base.id);
647 } else {
648 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
649 connector->base.id, drm_get_connector_name(connector));
650 }
651 }
652
653 /* mode_set_base is not a required function */
654 if (fb_changed && !crtc_funcs->mode_set_base)
655 mode_changed = true;
656
657 if (mode_changed) {
658 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
659 if (set->crtc->enabled) {
660 DRM_DEBUG_KMS("attempting to set mode from"
661 " userspace\n");
662 drm_mode_debug_printmodeline(set->mode);
663 old_fb = set->crtc->fb;
664 set->crtc->fb = set->fb;
665 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
666 set->x, set->y,
667 old_fb)) {
668 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
669 set->crtc->base.id);
670 set->crtc->fb = old_fb;
671 ret = -EINVAL;
672 goto fail;
673 }
674 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
675 for (i = 0; i < set->num_connectors; i++) {
676 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
677 drm_get_connector_name(set->connectors[i]));
678 set->connectors[i]->dpms = DRM_MODE_DPMS_ON;
679 }
680 }
681 drm_helper_disable_unused_functions(dev);
682 } else if (fb_changed) {
683 set->crtc->x = set->x;
684 set->crtc->y = set->y;
685
686 old_fb = set->crtc->fb;
687 if (set->crtc->fb != set->fb)
688 set->crtc->fb = set->fb;
689 ret = crtc_funcs->mode_set_base(set->crtc,
690 set->x, set->y, old_fb);
691 if (ret != 0) {
692 set->crtc->fb = old_fb;
693 goto fail;
694 }
695 }
696
697 kfree(save_connectors);
698 kfree(save_encoders);
699 kfree(save_crtcs);
700 return 0;
701
702fail:
703 /* Restore all previous data. */
704 count = 0;
705 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
706 *crtc = save_crtcs[count++];
707 }
708
709 count = 0;
710 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
711 *encoder = save_encoders[count++];
712 }
713
714 count = 0;
715 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
716 *connector = save_connectors[count++];
717 }
718
719 kfree(save_connectors);
720 kfree(save_encoders);
721 kfree(save_crtcs);
722 return ret;
723}
724EXPORT_SYMBOL(drm_crtc_helper_set_config);
725
726static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
727{
728 int dpms = DRM_MODE_DPMS_OFF;
729 struct drm_connector *connector;
730 struct drm_device *dev = encoder->dev;
731
732 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
733 if (connector->encoder == encoder)
734 if (connector->dpms < dpms)
735 dpms = connector->dpms;
736 return dpms;
737}
738
739static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
740{
741 int dpms = DRM_MODE_DPMS_OFF;
742 struct drm_connector *connector;
743 struct drm_device *dev = crtc->dev;
744
745 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
746 if (connector->encoder && connector->encoder->crtc == crtc)
747 if (connector->dpms < dpms)
748 dpms = connector->dpms;
749 return dpms;
750}
751
752/**
753 * drm_helper_connector_dpms
754 * @connector affected connector
755 * @mode DPMS mode
756 *
757 * Calls the low-level connector DPMS function, then
758 * calls appropriate encoder and crtc DPMS functions as well
759 */
760void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
761{
762 struct drm_encoder *encoder = connector->encoder;
763 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
764 int old_dpms;
765
766 if (mode == connector->dpms)
767 return;
768
769 old_dpms = connector->dpms;
770 connector->dpms = mode;
771
772 /* from off to on, do crtc then encoder */
773 if (mode < old_dpms) {
774 if (crtc) {
775 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
776 if (crtc_funcs->dpms)
777 (*crtc_funcs->dpms) (crtc,
778 drm_helper_choose_crtc_dpms(crtc));
779 }
780 if (encoder) {
781 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
782 if (encoder_funcs->dpms)
783 (*encoder_funcs->dpms) (encoder,
784 drm_helper_choose_encoder_dpms(encoder));
785 }
786 }
787
788 /* from on to off, do encoder then crtc */
789 if (mode > old_dpms) {
790 if (encoder) {
791 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
792 if (encoder_funcs->dpms)
793 (*encoder_funcs->dpms) (encoder,
794 drm_helper_choose_encoder_dpms(encoder));
795 }
796 if (crtc) {
797 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
798 if (crtc_funcs->dpms)
799 (*crtc_funcs->dpms) (crtc,
800 drm_helper_choose_crtc_dpms(crtc));
801 }
802 }
803
804 return;
805}
806EXPORT_SYMBOL(drm_helper_connector_dpms);
807
808int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
809 struct drm_mode_fb_cmd *mode_cmd)
810{
811 fb->width = mode_cmd->width;
812 fb->height = mode_cmd->height;
813 fb->pitch = mode_cmd->pitch;
814 fb->bits_per_pixel = mode_cmd->bpp;
815 fb->depth = mode_cmd->depth;
816
817 return 0;
818}
819EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
820
821int drm_helper_resume_force_mode(struct drm_device *dev)
822{
823 struct drm_crtc *crtc;
824 struct drm_encoder *encoder;
825 struct drm_encoder_helper_funcs *encoder_funcs;
826 struct drm_crtc_helper_funcs *crtc_funcs;
827 int ret;
828
829 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
830
831 if (!crtc->enabled)
832 continue;
833
834 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
835 crtc->x, crtc->y, crtc->fb);
836
837 if (ret == false)
838 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
839
840 /* Turn off outputs that were already powered off */
841 if (drm_helper_choose_crtc_dpms(crtc)) {
842 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
843
844 if(encoder->crtc != crtc)
845 continue;
846
847 encoder_funcs = encoder->helper_private;
848 if (encoder_funcs->dpms)
849 (*encoder_funcs->dpms) (encoder,
850 drm_helper_choose_encoder_dpms(encoder));
851 }
852
853 crtc_funcs = crtc->helper_private;
854 if (crtc_funcs->dpms)
855 (*crtc_funcs->dpms) (crtc,
856 drm_helper_choose_crtc_dpms(crtc));
857 }
858 }
859 /* disable the unused connectors while restoring the modesetting */
860 drm_helper_disable_unused_functions(dev);
861 return 0;
862}
863EXPORT_SYMBOL(drm_helper_resume_force_mode);
864
865#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
866static void output_poll_execute(struct work_struct *work)
867{
868 struct delayed_work *delayed_work = to_delayed_work(work);
869 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
870 struct drm_connector *connector;
871 enum drm_connector_status old_status;
872 bool repoll = false, changed = false;
873
874 if (!drm_kms_helper_poll)
875 return;
876
877 mutex_lock(&dev->mode_config.mutex);
878 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
879
880 /* if this is HPD or polled don't check it -
881 TV out for instance */
882 if (!connector->polled)
883 continue;
884
885 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
886 repoll = true;
887
888 old_status = connector->status;
889 /* if we are connected and don't want to poll for disconnect
890 skip it */
891 if (old_status == connector_status_connected &&
892 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
893 !(connector->polled & DRM_CONNECTOR_POLL_HPD))
894 continue;
895
896 connector->status = connector->funcs->detect(connector, false);
897 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
898 connector->base.id,
899 drm_get_connector_name(connector),
900 old_status, connector->status);
901 if (old_status != connector->status)
902 changed = true;
903 }
904
905 mutex_unlock(&dev->mode_config.mutex);
906
907 if (changed) {
908 /* send a uevent + call fbdev */
909 drm_sysfs_hotplug_event(dev);
910 if (dev->mode_config.funcs->output_poll_changed)
911 dev->mode_config.funcs->output_poll_changed(dev);
912 }
913
914 if (repoll)
915 queue_delayed_work(system_nrt_wq, delayed_work, DRM_OUTPUT_POLL_PERIOD);
916}
917
918void drm_kms_helper_poll_disable(struct drm_device *dev)
919{
920 if (!dev->mode_config.poll_enabled)
921 return;
922 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
923}
924EXPORT_SYMBOL(drm_kms_helper_poll_disable);
925
926void drm_kms_helper_poll_enable(struct drm_device *dev)
927{
928 bool poll = false;
929 struct drm_connector *connector;
930
931 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
932 return;
933
934 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
935 if (connector->polled)
936 poll = true;
937 }
938
939 if (poll)
940 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
941}
942EXPORT_SYMBOL(drm_kms_helper_poll_enable);
943
944void drm_kms_helper_poll_init(struct drm_device *dev)
945{
946 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
947 dev->mode_config.poll_enabled = true;
948
949 drm_kms_helper_poll_enable(dev);
950}
951EXPORT_SYMBOL(drm_kms_helper_poll_init);
952
953void drm_kms_helper_poll_fini(struct drm_device *dev)
954{
955 drm_kms_helper_poll_disable(dev);
956}
957EXPORT_SYMBOL(drm_kms_helper_poll_fini);
958
959void drm_helper_hpd_irq_event(struct drm_device *dev)
960{
961 if (!dev->mode_config.poll_enabled)
962 return;
963
964 /* kill timer and schedule immediate execution, this doesn't block */
965 cancel_delayed_work(&dev->mode_config.output_poll_work);
966 if (drm_kms_helper_poll)
967 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, 0);
968}
969EXPORT_SYMBOL(drm_helper_hpd_irq_event);
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);