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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/kernel.h>
33#include <linux/export.h>
34#include <linux/moduleparam.h>
35
36#include <drm/drmP.h>
37#include <drm/drm_atomic.h>
38#include <drm/drm_crtc.h>
39#include <drm/drm_fourcc.h>
40#include <drm/drm_crtc_helper.h>
41#include <drm/drm_fb_helper.h>
42#include <drm/drm_plane_helper.h>
43#include <drm/drm_atomic_helper.h>
44#include <drm/drm_edid.h>
45
46/**
47 * DOC: overview
48 *
49 * The CRTC modeset helper library provides a default set_config implementation
50 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
51 * the same callbacks which drivers can use to e.g. restore the modeset
52 * configuration on resume with drm_helper_resume_force_mode().
53 *
54 * Note that this helper library doesn't track the current power state of CRTCs
55 * and encoders. It can call callbacks like ->dpms() even though the hardware is
56 * already in the desired state. This deficiency has been fixed in the atomic
57 * helpers.
58 *
59 * The driver callbacks are mostly compatible with the atomic modeset helpers,
60 * except for the handling of the primary plane: Atomic helpers require that the
61 * primary plane is implemented as a real standalone plane and not directly tied
62 * to the CRTC state. For easier transition this library provides functions to
63 * implement the old semantics required by the CRTC helpers using the new plane
64 * and atomic helper callbacks.
65 *
66 * Drivers are strongly urged to convert to the atomic helpers (by way of first
67 * converting to the plane helpers). New drivers must not use these functions
68 * but need to implement the atomic interface instead, potentially using the
69 * atomic helpers for that.
70 *
71 * These legacy modeset helpers use the same function table structures as
72 * all other modesetting helpers. See the documentation for struct
73 * &drm_crtc_helper_funcs, struct &drm_encoder_helper_funcs and struct
74 * &drm_connector_helper_funcs.
75 */
76
77/**
78 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
79 * connector list
80 * @dev: drm device to operate on
81 *
82 * Some userspace presumes that the first connected connector is the main
83 * display, where it's supposed to display e.g. the login screen. For
84 * laptops, this should be the main panel. Use this function to sort all
85 * (eDP/LVDS) panels to the front of the connector list, instead of
86 * painstakingly trying to initialize them in the right order.
87 */
88void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
89{
90 struct drm_connector *connector, *tmp;
91 struct list_head panel_list;
92
93 INIT_LIST_HEAD(&panel_list);
94
95 list_for_each_entry_safe(connector, tmp,
96 &dev->mode_config.connector_list, head) {
97 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
98 connector->connector_type == DRM_MODE_CONNECTOR_eDP)
99 list_move_tail(&connector->head, &panel_list);
100 }
101
102 list_splice(&panel_list, &dev->mode_config.connector_list);
103}
104EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
105
106/**
107 * drm_helper_encoder_in_use - check if a given encoder is in use
108 * @encoder: encoder to check
109 *
110 * Checks whether @encoder is with the current mode setting output configuration
111 * in use by any connector. This doesn't mean that it is actually enabled since
112 * the DPMS state is tracked separately.
113 *
114 * Returns:
115 * True if @encoder is used, false otherwise.
116 */
117bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
118{
119 struct drm_connector *connector;
120 struct drm_device *dev = encoder->dev;
121
122 /*
123 * We can expect this mutex to be locked if we are not panicking.
124 * Locking is currently fubar in the panic handler.
125 */
126 if (!oops_in_progress) {
127 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
128 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
129 }
130
131 drm_for_each_connector(connector, dev)
132 if (connector->encoder == encoder)
133 return true;
134 return false;
135}
136EXPORT_SYMBOL(drm_helper_encoder_in_use);
137
138/**
139 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
140 * @crtc: CRTC to check
141 *
142 * Checks whether @crtc is with the current mode setting output configuration
143 * in use by any connector. This doesn't mean that it is actually enabled since
144 * the DPMS state is tracked separately.
145 *
146 * Returns:
147 * True if @crtc is used, false otherwise.
148 */
149bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
150{
151 struct drm_encoder *encoder;
152 struct drm_device *dev = crtc->dev;
153
154 /*
155 * We can expect this mutex to be locked if we are not panicking.
156 * Locking is currently fubar in the panic handler.
157 */
158 if (!oops_in_progress)
159 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
160
161 drm_for_each_encoder(encoder, dev)
162 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
163 return true;
164 return false;
165}
166EXPORT_SYMBOL(drm_helper_crtc_in_use);
167
168static void
169drm_encoder_disable(struct drm_encoder *encoder)
170{
171 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
172
173 drm_bridge_disable(encoder->bridge);
174
175 if (encoder_funcs->disable)
176 (*encoder_funcs->disable)(encoder);
177 else
178 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
179
180 drm_bridge_post_disable(encoder->bridge);
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 crtc->enabled = drm_helper_crtc_in_use(crtc);
201 if (!crtc->enabled) {
202 if (crtc_funcs->disable)
203 (*crtc_funcs->disable)(crtc);
204 else
205 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
206 crtc->primary->fb = NULL;
207 }
208 }
209}
210
211/**
212 * drm_helper_disable_unused_functions - disable unused objects
213 * @dev: DRM device
214 *
215 * This function walks through the entire mode setting configuration of @dev. It
216 * will remove any CRTC links of unused encoders and encoder links of
217 * disconnected connectors. Then it will disable all unused encoders and CRTCs
218 * either by calling their disable callback if available or by calling their
219 * dpms callback with DRM_MODE_DPMS_OFF.
220 *
221 * NOTE:
222 *
223 * This function is part of the legacy modeset helper library and will cause
224 * major confusion with atomic drivers. This is because atomic helpers guarantee
225 * to never call ->disable() hooks on a disabled function, or ->enable() hooks
226 * on an enabled functions. drm_helper_disable_unused_functions() on the other
227 * hand throws such guarantees into the wind and calls disable hooks
228 * unconditionally on unused functions.
229 */
230void drm_helper_disable_unused_functions(struct drm_device *dev)
231{
232 drm_modeset_lock_all(dev);
233 __drm_helper_disable_unused_functions(dev);
234 drm_modeset_unlock_all(dev);
235}
236EXPORT_SYMBOL(drm_helper_disable_unused_functions);
237
238/*
239 * Check the CRTC we're going to map each output to vs. its current
240 * CRTC. If they don't match, we have to disable the output and the CRTC
241 * since the driver will have to re-route things.
242 */
243static void
244drm_crtc_prepare_encoders(struct drm_device *dev)
245{
246 const struct drm_encoder_helper_funcs *encoder_funcs;
247 struct drm_encoder *encoder;
248
249 drm_for_each_encoder(encoder, dev) {
250 encoder_funcs = encoder->helper_private;
251 /* Disable unused encoders */
252 if (encoder->crtc == NULL)
253 drm_encoder_disable(encoder);
254 /* Disable encoders whose CRTC is about to change */
255 if (encoder_funcs->get_crtc &&
256 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
257 drm_encoder_disable(encoder);
258 }
259}
260
261/**
262 * drm_crtc_helper_set_mode - internal helper to set a mode
263 * @crtc: CRTC to program
264 * @mode: mode to use
265 * @x: horizontal offset into the surface
266 * @y: vertical offset into the surface
267 * @old_fb: old framebuffer, for cleanup
268 *
269 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
270 * to fixup or reject the mode prior to trying to set it. This is an internal
271 * helper that drivers could e.g. use to update properties that require the
272 * entire output pipe to be disabled and re-enabled in a new configuration. For
273 * example for changing whether audio is enabled on a hdmi link or for changing
274 * panel fitter or dither attributes. It is also called by the
275 * drm_crtc_helper_set_config() helper function to drive the mode setting
276 * sequence.
277 *
278 * Returns:
279 * True if the mode was set successfully, false otherwise.
280 */
281bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
282 struct drm_display_mode *mode,
283 int x, int y,
284 struct drm_framebuffer *old_fb)
285{
286 struct drm_device *dev = crtc->dev;
287 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
288 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
289 const struct drm_encoder_helper_funcs *encoder_funcs;
290 int saved_x, saved_y;
291 bool saved_enabled;
292 struct drm_encoder *encoder;
293 bool ret = true;
294
295 drm_warn_on_modeset_not_all_locked(dev);
296
297 saved_enabled = crtc->enabled;
298 crtc->enabled = drm_helper_crtc_in_use(crtc);
299 if (!crtc->enabled)
300 return true;
301
302 adjusted_mode = drm_mode_duplicate(dev, mode);
303 if (!adjusted_mode) {
304 crtc->enabled = saved_enabled;
305 return false;
306 }
307
308 saved_mode = crtc->mode;
309 saved_hwmode = crtc->hwmode;
310 saved_x = crtc->x;
311 saved_y = crtc->y;
312
313 /* Update crtc values up front so the driver can rely on them for mode
314 * setting.
315 */
316 crtc->mode = *mode;
317 crtc->x = x;
318 crtc->y = y;
319
320 /* Pass our mode to the connectors and the CRTC to give them a chance to
321 * adjust it according to limitations or connector properties, and also
322 * a chance to reject the mode entirely.
323 */
324 drm_for_each_encoder(encoder, dev) {
325
326 if (encoder->crtc != crtc)
327 continue;
328
329 ret = drm_bridge_mode_fixup(encoder->bridge,
330 mode, adjusted_mode);
331 if (!ret) {
332 DRM_DEBUG_KMS("Bridge fixup failed\n");
333 goto done;
334 }
335
336 encoder_funcs = encoder->helper_private;
337 if (encoder_funcs->mode_fixup) {
338 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
339 adjusted_mode))) {
340 DRM_DEBUG_KMS("Encoder fixup failed\n");
341 goto done;
342 }
343 }
344 }
345
346 if (crtc_funcs->mode_fixup) {
347 if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
348 adjusted_mode))) {
349 DRM_DEBUG_KMS("CRTC fixup failed\n");
350 goto done;
351 }
352 }
353 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
354
355 crtc->hwmode = *adjusted_mode;
356
357 /* Prepare the encoders and CRTCs before setting the mode. */
358 drm_for_each_encoder(encoder, dev) {
359
360 if (encoder->crtc != crtc)
361 continue;
362
363 drm_bridge_disable(encoder->bridge);
364
365 encoder_funcs = encoder->helper_private;
366 /* Disable the encoders as the first thing we do. */
367 encoder_funcs->prepare(encoder);
368
369 drm_bridge_post_disable(encoder->bridge);
370 }
371
372 drm_crtc_prepare_encoders(dev);
373
374 crtc_funcs->prepare(crtc);
375
376 /* Set up the DPLL and any encoders state that needs to adjust or depend
377 * on the DPLL.
378 */
379 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
380 if (!ret)
381 goto done;
382
383 drm_for_each_encoder(encoder, dev) {
384
385 if (encoder->crtc != crtc)
386 continue;
387
388 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
389 encoder->base.id, encoder->name,
390 mode->base.id, mode->name);
391 encoder_funcs = encoder->helper_private;
392 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
393
394 drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
395 }
396
397 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
398 crtc_funcs->commit(crtc);
399
400 drm_for_each_encoder(encoder, dev) {
401
402 if (encoder->crtc != crtc)
403 continue;
404
405 drm_bridge_pre_enable(encoder->bridge);
406
407 encoder_funcs = encoder->helper_private;
408 encoder_funcs->commit(encoder);
409
410 drm_bridge_enable(encoder->bridge);
411 }
412
413 /* Calculate and store various constants which
414 * are later needed by vblank and swap-completion
415 * timestamping. They are derived from true hwmode.
416 */
417 drm_calc_timestamping_constants(crtc, &crtc->hwmode);
418
419 /* FIXME: add subpixel order */
420done:
421 drm_mode_destroy(dev, adjusted_mode);
422 if (!ret) {
423 crtc->enabled = saved_enabled;
424 crtc->mode = saved_mode;
425 crtc->hwmode = saved_hwmode;
426 crtc->x = saved_x;
427 crtc->y = saved_y;
428 }
429
430 return ret;
431}
432EXPORT_SYMBOL(drm_crtc_helper_set_mode);
433
434static void
435drm_crtc_helper_disable(struct drm_crtc *crtc)
436{
437 struct drm_device *dev = crtc->dev;
438 struct drm_connector *connector;
439 struct drm_encoder *encoder;
440
441 /* Decouple all encoders and their attached connectors from this crtc */
442 drm_for_each_encoder(encoder, dev) {
443 if (encoder->crtc != crtc)
444 continue;
445
446 drm_for_each_connector(connector, dev) {
447 if (connector->encoder != encoder)
448 continue;
449
450 connector->encoder = NULL;
451
452 /*
453 * drm_helper_disable_unused_functions() ought to be
454 * doing this, but since we've decoupled the encoder
455 * from the connector above, the required connection
456 * between them is henceforth no longer available.
457 */
458 connector->dpms = DRM_MODE_DPMS_OFF;
459 }
460 }
461
462 __drm_helper_disable_unused_functions(dev);
463}
464
465/**
466 * drm_crtc_helper_set_config - set a new config from userspace
467 * @set: mode set configuration
468 *
469 * The drm_crtc_helper_set_config() helper function implements the set_config
470 * callback of struct &drm_crtc_funcs for drivers using the legacy CRTC helpers.
471 *
472 * It first tries to locate the best encoder for each connector by calling the
473 * connector ->best_encoder() (struct &drm_connector_helper_funcs) helper
474 * operation.
475 *
476 * After locating the appropriate encoders, the helper function will call the
477 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
478 * or reject it completely in which case an error will be returned to the
479 * application. If the new configuration after mode adjustment is identical to
480 * the current configuration the helper function will return without performing
481 * any other operation.
482 *
483 * If the adjusted mode is identical to the current mode but changes to the
484 * frame buffer need to be applied, the drm_crtc_helper_set_config() function
485 * will call the CRTC ->mode_set_base() (struct &drm_crtc_helper_funcs) helper
486 * operation.
487 *
488 * If the adjusted mode differs from the current mode, or if the
489 * ->mode_set_base() helper operation is not provided, the helper function
490 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
491 * and ->commit() CRTC and encoder helper operations, in that order.
492 * Alternatively it can also use the dpms and disable helper operations. For
493 * details see struct &drm_crtc_helper_funcs and struct
494 * &drm_encoder_helper_funcs.
495 *
496 * This function is deprecated. New drivers must implement atomic modeset
497 * support, for which this function is unsuitable. Instead drivers should use
498 * drm_atomic_helper_set_config().
499 *
500 * Returns:
501 * Returns 0 on success, negative errno numbers on failure.
502 */
503int drm_crtc_helper_set_config(struct drm_mode_set *set)
504{
505 struct drm_device *dev;
506 struct drm_crtc *new_crtc;
507 struct drm_encoder *save_encoders, *new_encoder, *encoder;
508 bool mode_changed = false; /* if true do a full mode set */
509 bool fb_changed = false; /* if true and !mode_changed just do a flip */
510 struct drm_connector *save_connectors, *connector;
511 int count = 0, ro, fail = 0;
512 const struct drm_crtc_helper_funcs *crtc_funcs;
513 struct drm_mode_set save_set;
514 int ret;
515 int i;
516
517 DRM_DEBUG_KMS("\n");
518
519 BUG_ON(!set);
520 BUG_ON(!set->crtc);
521 BUG_ON(!set->crtc->helper_private);
522
523 /* Enforce sane interface api - has been abused by the fb helper. */
524 BUG_ON(!set->mode && set->fb);
525 BUG_ON(set->fb && set->num_connectors == 0);
526
527 crtc_funcs = set->crtc->helper_private;
528
529 if (!set->mode)
530 set->fb = NULL;
531
532 if (set->fb) {
533 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
534 set->crtc->base.id, set->crtc->name,
535 set->fb->base.id,
536 (int)set->num_connectors, set->x, set->y);
537 } else {
538 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
539 set->crtc->base.id, set->crtc->name);
540 drm_crtc_helper_disable(set->crtc);
541 return 0;
542 }
543
544 dev = set->crtc->dev;
545
546 drm_warn_on_modeset_not_all_locked(dev);
547
548 /*
549 * Allocate space for the backup of all (non-pointer) encoder and
550 * connector data.
551 */
552 save_encoders = kzalloc(dev->mode_config.num_encoder *
553 sizeof(struct drm_encoder), GFP_KERNEL);
554 if (!save_encoders)
555 return -ENOMEM;
556
557 save_connectors = kzalloc(dev->mode_config.num_connector *
558 sizeof(struct drm_connector), GFP_KERNEL);
559 if (!save_connectors) {
560 kfree(save_encoders);
561 return -ENOMEM;
562 }
563
564 /*
565 * Copy data. Note that driver private data is not affected.
566 * Should anything bad happen only the expected state is
567 * restored, not the drivers personal bookkeeping.
568 */
569 count = 0;
570 drm_for_each_encoder(encoder, dev) {
571 save_encoders[count++] = *encoder;
572 }
573
574 count = 0;
575 drm_for_each_connector(connector, dev) {
576 save_connectors[count++] = *connector;
577 }
578
579 save_set.crtc = set->crtc;
580 save_set.mode = &set->crtc->mode;
581 save_set.x = set->crtc->x;
582 save_set.y = set->crtc->y;
583 save_set.fb = set->crtc->primary->fb;
584
585 /* We should be able to check here if the fb has the same properties
586 * and then just flip_or_move it */
587 if (set->crtc->primary->fb != set->fb) {
588 /* If we have no fb then treat it as a full mode set */
589 if (set->crtc->primary->fb == NULL) {
590 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
591 mode_changed = true;
592 } else if (set->fb->pixel_format !=
593 set->crtc->primary->fb->pixel_format) {
594 mode_changed = true;
595 } else
596 fb_changed = true;
597 }
598
599 if (set->x != set->crtc->x || set->y != set->crtc->y)
600 fb_changed = true;
601
602 if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
603 DRM_DEBUG_KMS("modes are different, full mode set\n");
604 drm_mode_debug_printmodeline(&set->crtc->mode);
605 drm_mode_debug_printmodeline(set->mode);
606 mode_changed = true;
607 }
608
609 /* a) traverse passed in connector list and get encoders for them */
610 count = 0;
611 drm_for_each_connector(connector, dev) {
612 const struct drm_connector_helper_funcs *connector_funcs =
613 connector->helper_private;
614 new_encoder = connector->encoder;
615 for (ro = 0; ro < set->num_connectors; ro++) {
616 if (set->connectors[ro] == connector) {
617 new_encoder = connector_funcs->best_encoder(connector);
618 /* if we can't get an encoder for a connector
619 we are setting now - then fail */
620 if (new_encoder == NULL)
621 /* don't break so fail path works correct */
622 fail = 1;
623
624 if (connector->dpms != DRM_MODE_DPMS_ON) {
625 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
626 mode_changed = true;
627 }
628
629 break;
630 }
631 }
632
633 if (new_encoder != connector->encoder) {
634 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
635 mode_changed = true;
636 /* If the encoder is reused for another connector, then
637 * the appropriate crtc will be set later.
638 */
639 if (connector->encoder)
640 connector->encoder->crtc = NULL;
641 connector->encoder = new_encoder;
642 }
643 }
644
645 if (fail) {
646 ret = -EINVAL;
647 goto fail;
648 }
649
650 count = 0;
651 drm_for_each_connector(connector, dev) {
652 if (!connector->encoder)
653 continue;
654
655 if (connector->encoder->crtc == set->crtc)
656 new_crtc = NULL;
657 else
658 new_crtc = connector->encoder->crtc;
659
660 for (ro = 0; ro < set->num_connectors; ro++) {
661 if (set->connectors[ro] == connector)
662 new_crtc = set->crtc;
663 }
664
665 /* Make sure the new CRTC will work with the encoder */
666 if (new_crtc &&
667 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
668 ret = -EINVAL;
669 goto fail;
670 }
671 if (new_crtc != connector->encoder->crtc) {
672 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
673 mode_changed = true;
674 connector->encoder->crtc = new_crtc;
675 }
676 if (new_crtc) {
677 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
678 connector->base.id, connector->name,
679 new_crtc->base.id, new_crtc->name);
680 } else {
681 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
682 connector->base.id, connector->name);
683 }
684 }
685
686 /* mode_set_base is not a required function */
687 if (fb_changed && !crtc_funcs->mode_set_base)
688 mode_changed = true;
689
690 if (mode_changed) {
691 if (drm_helper_crtc_in_use(set->crtc)) {
692 DRM_DEBUG_KMS("attempting to set mode from"
693 " userspace\n");
694 drm_mode_debug_printmodeline(set->mode);
695 set->crtc->primary->fb = set->fb;
696 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
697 set->x, set->y,
698 save_set.fb)) {
699 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
700 set->crtc->base.id, set->crtc->name);
701 set->crtc->primary->fb = save_set.fb;
702 ret = -EINVAL;
703 goto fail;
704 }
705 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
706 for (i = 0; i < set->num_connectors; i++) {
707 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
708 set->connectors[i]->name);
709 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
710 }
711 }
712 __drm_helper_disable_unused_functions(dev);
713 } else if (fb_changed) {
714 set->crtc->x = set->x;
715 set->crtc->y = set->y;
716 set->crtc->primary->fb = set->fb;
717 ret = crtc_funcs->mode_set_base(set->crtc,
718 set->x, set->y, save_set.fb);
719 if (ret != 0) {
720 set->crtc->x = save_set.x;
721 set->crtc->y = save_set.y;
722 set->crtc->primary->fb = save_set.fb;
723 goto fail;
724 }
725 }
726
727 kfree(save_connectors);
728 kfree(save_encoders);
729 return 0;
730
731fail:
732 /* Restore all previous data. */
733 count = 0;
734 drm_for_each_encoder(encoder, dev) {
735 *encoder = save_encoders[count++];
736 }
737
738 count = 0;
739 drm_for_each_connector(connector, dev) {
740 *connector = save_connectors[count++];
741 }
742
743 /* Try to restore the config */
744 if (mode_changed &&
745 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
746 save_set.y, save_set.fb))
747 DRM_ERROR("failed to restore config after modeset failure\n");
748
749 kfree(save_connectors);
750 kfree(save_encoders);
751 return ret;
752}
753EXPORT_SYMBOL(drm_crtc_helper_set_config);
754
755static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
756{
757 int dpms = DRM_MODE_DPMS_OFF;
758 struct drm_connector *connector;
759 struct drm_device *dev = encoder->dev;
760
761 drm_for_each_connector(connector, dev)
762 if (connector->encoder == encoder)
763 if (connector->dpms < dpms)
764 dpms = connector->dpms;
765 return dpms;
766}
767
768/* Helper which handles bridge ordering around encoder dpms */
769static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
770{
771 struct drm_bridge *bridge = encoder->bridge;
772 const struct drm_encoder_helper_funcs *encoder_funcs;
773
774 if (mode == DRM_MODE_DPMS_ON)
775 drm_bridge_pre_enable(bridge);
776 else
777 drm_bridge_disable(bridge);
778
779 encoder_funcs = encoder->helper_private;
780 if (encoder_funcs->dpms)
781 encoder_funcs->dpms(encoder, mode);
782
783 if (mode == DRM_MODE_DPMS_ON)
784 drm_bridge_enable(bridge);
785 else
786 drm_bridge_post_disable(bridge);
787}
788
789static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
790{
791 int dpms = DRM_MODE_DPMS_OFF;
792 struct drm_connector *connector;
793 struct drm_device *dev = crtc->dev;
794
795 drm_for_each_connector(connector, dev)
796 if (connector->encoder && connector->encoder->crtc == crtc)
797 if (connector->dpms < dpms)
798 dpms = connector->dpms;
799 return dpms;
800}
801
802/**
803 * drm_helper_connector_dpms() - connector dpms helper implementation
804 * @connector: affected connector
805 * @mode: DPMS mode
806 *
807 * The drm_helper_connector_dpms() helper function implements the ->dpms()
808 * callback of struct &drm_connector_funcs for drivers using the legacy CRTC helpers.
809 *
810 * This is the main helper function provided by the CRTC helper framework for
811 * implementing the DPMS connector attribute. It computes the new desired DPMS
812 * state for all encoders and CRTCs in the output mesh and calls the ->dpms()
813 * callbacks provided by the driver in struct &drm_crtc_helper_funcs and struct
814 * &drm_encoder_helper_funcs appropriately.
815 *
816 * This function is deprecated. New drivers must implement atomic modeset
817 * support, for which this function is unsuitable. Instead drivers should use
818 * drm_atomic_helper_connector_dpms().
819 *
820 * Returns:
821 * Always returns 0.
822 */
823int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
824{
825 struct drm_encoder *encoder = connector->encoder;
826 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
827 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
828
829 if (mode == connector->dpms)
830 return 0;
831
832 old_dpms = connector->dpms;
833 connector->dpms = mode;
834
835 if (encoder)
836 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
837
838 /* from off to on, do crtc then encoder */
839 if (mode < old_dpms) {
840 if (crtc) {
841 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
842 if (crtc_funcs->dpms)
843 (*crtc_funcs->dpms) (crtc,
844 drm_helper_choose_crtc_dpms(crtc));
845 }
846 if (encoder)
847 drm_helper_encoder_dpms(encoder, encoder_dpms);
848 }
849
850 /* from on to off, do encoder then crtc */
851 if (mode > old_dpms) {
852 if (encoder)
853 drm_helper_encoder_dpms(encoder, encoder_dpms);
854 if (crtc) {
855 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
856 if (crtc_funcs->dpms)
857 (*crtc_funcs->dpms) (crtc,
858 drm_helper_choose_crtc_dpms(crtc));
859 }
860 }
861
862 return 0;
863}
864EXPORT_SYMBOL(drm_helper_connector_dpms);
865
866/**
867 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
868 * @fb: drm_framebuffer object to fill out
869 * @mode_cmd: metadata from the userspace fb creation request
870 *
871 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
872 * metadata fields.
873 */
874void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
875 const struct drm_mode_fb_cmd2 *mode_cmd)
876{
877 int i;
878
879 fb->width = mode_cmd->width;
880 fb->height = mode_cmd->height;
881 for (i = 0; i < 4; i++) {
882 fb->pitches[i] = mode_cmd->pitches[i];
883 fb->offsets[i] = mode_cmd->offsets[i];
884 fb->modifier[i] = mode_cmd->modifier[i];
885 }
886 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
887 &fb->bits_per_pixel);
888 fb->pixel_format = mode_cmd->pixel_format;
889 fb->flags = mode_cmd->flags;
890}
891EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
892
893/**
894 * drm_helper_resume_force_mode - force-restore mode setting configuration
895 * @dev: drm_device which should be restored
896 *
897 * Drivers which use the mode setting helpers can use this function to
898 * force-restore the mode setting configuration e.g. on resume or when something
899 * else might have trampled over the hw state (like some overzealous old BIOSen
900 * tended to do).
901 *
902 * This helper doesn't provide a error return value since restoring the old
903 * config should never fail due to resource allocation issues since the driver
904 * has successfully set the restored configuration already. Hence this should
905 * boil down to the equivalent of a few dpms on calls, which also don't provide
906 * an error code.
907 *
908 * Drivers where simply restoring an old configuration again might fail (e.g.
909 * due to slight differences in allocating shared resources when the
910 * configuration is restored in a different order than when userspace set it up)
911 * need to use their own restore logic.
912 *
913 * This function is deprecated. New drivers should implement atomic mode-
914 * setting and use the atomic suspend/resume helpers.
915 *
916 * See also:
917 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
918 */
919void drm_helper_resume_force_mode(struct drm_device *dev)
920{
921 struct drm_crtc *crtc;
922 struct drm_encoder *encoder;
923 const struct drm_crtc_helper_funcs *crtc_funcs;
924 int encoder_dpms;
925 bool ret;
926
927 drm_modeset_lock_all(dev);
928 drm_for_each_crtc(crtc, dev) {
929
930 if (!crtc->enabled)
931 continue;
932
933 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
934 crtc->x, crtc->y, crtc->primary->fb);
935
936 /* Restoring the old config should never fail! */
937 if (ret == false)
938 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
939
940 /* Turn off outputs that were already powered off */
941 if (drm_helper_choose_crtc_dpms(crtc)) {
942 drm_for_each_encoder(encoder, dev) {
943
944 if(encoder->crtc != crtc)
945 continue;
946
947 encoder_dpms = drm_helper_choose_encoder_dpms(
948 encoder);
949
950 drm_helper_encoder_dpms(encoder, encoder_dpms);
951 }
952
953 crtc_funcs = crtc->helper_private;
954 if (crtc_funcs->dpms)
955 (*crtc_funcs->dpms) (crtc,
956 drm_helper_choose_crtc_dpms(crtc));
957 }
958 }
959
960 /* disable the unused connectors while restoring the modesetting */
961 __drm_helper_disable_unused_functions(dev);
962 drm_modeset_unlock_all(dev);
963}
964EXPORT_SYMBOL(drm_helper_resume_force_mode);
965
966/**
967 * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers
968 * @crtc: DRM CRTC
969 * @mode: DRM display mode which userspace requested
970 * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks
971 * @x: x offset of the CRTC scanout area on the underlying framebuffer
972 * @y: y offset of the CRTC scanout area on the underlying framebuffer
973 * @old_fb: previous framebuffer
974 *
975 * This function implements a callback useable as the ->mode_set callback
976 * required by the CRTC helpers. Besides the atomic plane helper functions for
977 * the primary plane the driver must also provide the ->mode_set_nofb callback
978 * to set up the CRTC.
979 *
980 * This is a transitional helper useful for converting drivers to the atomic
981 * interfaces.
982 */
983int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
984 struct drm_display_mode *adjusted_mode, int x, int y,
985 struct drm_framebuffer *old_fb)
986{
987 struct drm_crtc_state *crtc_state;
988 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
989 int ret;
990
991 if (crtc->funcs->atomic_duplicate_state)
992 crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
993 else {
994 if (!crtc->state)
995 drm_atomic_helper_crtc_reset(crtc);
996
997 crtc_state = drm_atomic_helper_crtc_duplicate_state(crtc);
998 }
999
1000 if (!crtc_state)
1001 return -ENOMEM;
1002
1003 crtc_state->planes_changed = true;
1004 crtc_state->mode_changed = true;
1005 ret = drm_atomic_set_mode_for_crtc(crtc_state, mode);
1006 if (ret)
1007 goto out;
1008 drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode);
1009
1010 if (crtc_funcs->atomic_check) {
1011 ret = crtc_funcs->atomic_check(crtc, crtc_state);
1012 if (ret)
1013 goto out;
1014 }
1015
1016 swap(crtc->state, crtc_state);
1017
1018 crtc_funcs->mode_set_nofb(crtc);
1019
1020 ret = drm_helper_crtc_mode_set_base(crtc, x, y, old_fb);
1021
1022out:
1023 if (crtc_state) {
1024 if (crtc->funcs->atomic_destroy_state)
1025 crtc->funcs->atomic_destroy_state(crtc, crtc_state);
1026 else
1027 drm_atomic_helper_crtc_destroy_state(crtc, crtc_state);
1028 }
1029
1030 return ret;
1031}
1032EXPORT_SYMBOL(drm_helper_crtc_mode_set);
1033
1034/**
1035 * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers
1036 * @crtc: DRM CRTC
1037 * @x: x offset of the CRTC scanout area on the underlying framebuffer
1038 * @y: y offset of the CRTC scanout area on the underlying framebuffer
1039 * @old_fb: previous framebuffer
1040 *
1041 * This function implements a callback useable as the ->mode_set_base used
1042 * required by the CRTC helpers. The driver must provide the atomic plane helper
1043 * functions for the primary plane.
1044 *
1045 * This is a transitional helper useful for converting drivers to the atomic
1046 * interfaces.
1047 */
1048int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
1049 struct drm_framebuffer *old_fb)
1050{
1051 struct drm_plane_state *plane_state;
1052 struct drm_plane *plane = crtc->primary;
1053
1054 if (plane->funcs->atomic_duplicate_state)
1055 plane_state = plane->funcs->atomic_duplicate_state(plane);
1056 else if (plane->state)
1057 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
1058 else
1059 plane_state = kzalloc(sizeof(*plane_state), GFP_KERNEL);
1060 if (!plane_state)
1061 return -ENOMEM;
1062 plane_state->plane = plane;
1063
1064 plane_state->crtc = crtc;
1065 drm_atomic_set_fb_for_plane(plane_state, crtc->primary->fb);
1066 plane_state->crtc_x = 0;
1067 plane_state->crtc_y = 0;
1068 plane_state->crtc_h = crtc->mode.vdisplay;
1069 plane_state->crtc_w = crtc->mode.hdisplay;
1070 plane_state->src_x = x << 16;
1071 plane_state->src_y = y << 16;
1072 plane_state->src_h = crtc->mode.vdisplay << 16;
1073 plane_state->src_w = crtc->mode.hdisplay << 16;
1074
1075 return drm_plane_helper_commit(plane, plane_state, old_fb);
1076}
1077EXPORT_SYMBOL(drm_helper_crtc_mode_set_base);
1078
1079/**
1080 * drm_helper_crtc_enable_color_mgmt - enable color management properties
1081 * @crtc: DRM CRTC
1082 * @degamma_lut_size: the size of the degamma lut (before CSC)
1083 * @gamma_lut_size: the size of the gamma lut (after CSC)
1084 *
1085 * This function lets the driver enable the color correction properties on a
1086 * CRTC. This includes 3 degamma, csc and gamma properties that userspace can
1087 * set and 2 size properties to inform the userspace of the lut sizes.
1088 */
1089void drm_helper_crtc_enable_color_mgmt(struct drm_crtc *crtc,
1090 int degamma_lut_size,
1091 int gamma_lut_size)
1092{
1093 struct drm_device *dev = crtc->dev;
1094 struct drm_mode_config *config = &dev->mode_config;
1095
1096 drm_object_attach_property(&crtc->base,
1097 config->degamma_lut_property, 0);
1098 drm_object_attach_property(&crtc->base,
1099 config->ctm_property, 0);
1100 drm_object_attach_property(&crtc->base,
1101 config->gamma_lut_property, 0);
1102
1103 drm_object_attach_property(&crtc->base,
1104 config->degamma_lut_size_property,
1105 degamma_lut_size);
1106 drm_object_attach_property(&crtc->base,
1107 config->gamma_lut_size_property,
1108 gamma_lut_size);
1109}
1110EXPORT_SYMBOL(drm_helper_crtc_enable_color_mgmt);