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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_encoder.h>
40#include <drm/drm_fourcc.h>
41#include <drm/drm_crtc_helper.h>
42#include <drm/drm_fb_helper.h>
43#include <drm/drm_plane_helper.h>
44#include <drm/drm_atomic_helper.h>
45#include <drm/drm_edid.h>
46
47/**
48 * DOC: overview
49 *
50 * The CRTC modeset helper library provides a default set_config implementation
51 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
52 * the same callbacks which drivers can use to e.g. restore the modeset
53 * configuration on resume with drm_helper_resume_force_mode().
54 *
55 * Note that this helper library doesn't track the current power state of CRTCs
56 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even
57 * though the hardware is already in the desired state. This deficiency has been
58 * fixed in the atomic helpers.
59 *
60 * The driver callbacks are mostly compatible with the atomic modeset helpers,
61 * except for the handling of the primary plane: Atomic helpers require that the
62 * primary plane is implemented as a real standalone plane and not directly tied
63 * to the CRTC state. For easier transition this library provides functions to
64 * implement the old semantics required by the CRTC helpers using the new plane
65 * and atomic helper callbacks.
66 *
67 * Drivers are strongly urged to convert to the atomic helpers (by way of first
68 * converting to the plane helpers). New drivers must not use these functions
69 * but need to implement the atomic interface instead, potentially using the
70 * atomic helpers for that.
71 *
72 * These legacy modeset helpers use the same function table structures as
73 * all other modesetting helpers. See the documentation for struct
74 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct
75 * &drm_connector_helper_funcs.
76 */
77
78/**
79 * drm_helper_encoder_in_use - check if a given encoder is in use
80 * @encoder: encoder to check
81 *
82 * Checks whether @encoder is with the current mode setting output configuration
83 * in use by any connector. This doesn't mean that it is actually enabled since
84 * the DPMS state is tracked separately.
85 *
86 * Returns:
87 * True if @encoder is used, false otherwise.
88 */
89bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
90{
91 struct drm_connector *connector;
92 struct drm_connector_list_iter conn_iter;
93 struct drm_device *dev = encoder->dev;
94
95 /*
96 * We can expect this mutex to be locked if we are not panicking.
97 * Locking is currently fubar in the panic handler.
98 */
99 if (!oops_in_progress) {
100 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
101 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
102 }
103
104
105 drm_connector_list_iter_begin(dev, &conn_iter);
106 drm_for_each_connector_iter(connector, &conn_iter) {
107 if (connector->encoder == encoder) {
108 drm_connector_list_iter_end(&conn_iter);
109 return true;
110 }
111 }
112 drm_connector_list_iter_end(&conn_iter);
113 return false;
114}
115EXPORT_SYMBOL(drm_helper_encoder_in_use);
116
117/**
118 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
119 * @crtc: CRTC to check
120 *
121 * Checks whether @crtc is with the current mode setting output configuration
122 * in use by any connector. This doesn't mean that it is actually enabled since
123 * the DPMS state is tracked separately.
124 *
125 * Returns:
126 * True if @crtc is used, false otherwise.
127 */
128bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
129{
130 struct drm_encoder *encoder;
131 struct drm_device *dev = crtc->dev;
132
133 /*
134 * We can expect this mutex to be locked if we are not panicking.
135 * Locking is currently fubar in the panic handler.
136 */
137 if (!oops_in_progress)
138 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
139
140 drm_for_each_encoder(encoder, dev)
141 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
142 return true;
143 return false;
144}
145EXPORT_SYMBOL(drm_helper_crtc_in_use);
146
147static void
148drm_encoder_disable(struct drm_encoder *encoder)
149{
150 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
151
152 if (!encoder_funcs)
153 return;
154
155 drm_bridge_disable(encoder->bridge);
156
157 if (encoder_funcs->disable)
158 (*encoder_funcs->disable)(encoder);
159 else if (encoder_funcs->dpms)
160 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
161
162 drm_bridge_post_disable(encoder->bridge);
163}
164
165static void __drm_helper_disable_unused_functions(struct drm_device *dev)
166{
167 struct drm_encoder *encoder;
168 struct drm_crtc *crtc;
169
170 drm_warn_on_modeset_not_all_locked(dev);
171
172 drm_for_each_encoder(encoder, dev) {
173 if (!drm_helper_encoder_in_use(encoder)) {
174 drm_encoder_disable(encoder);
175 /* disconnect encoder from any connector */
176 encoder->crtc = NULL;
177 }
178 }
179
180 drm_for_each_crtc(crtc, dev) {
181 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
182 crtc->enabled = drm_helper_crtc_in_use(crtc);
183 if (!crtc->enabled) {
184 if (crtc_funcs->disable)
185 (*crtc_funcs->disable)(crtc);
186 else
187 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
188 crtc->primary->fb = NULL;
189 }
190 }
191}
192
193/**
194 * drm_helper_disable_unused_functions - disable unused objects
195 * @dev: DRM device
196 *
197 * This function walks through the entire mode setting configuration of @dev. It
198 * will remove any CRTC links of unused encoders and encoder links of
199 * disconnected connectors. Then it will disable all unused encoders and CRTCs
200 * either by calling their disable callback if available or by calling their
201 * dpms callback with DRM_MODE_DPMS_OFF.
202 *
203 * NOTE:
204 *
205 * This function is part of the legacy modeset helper library and will cause
206 * major confusion with atomic drivers. This is because atomic helpers guarantee
207 * to never call ->disable() hooks on a disabled function, or ->enable() hooks
208 * on an enabled functions. drm_helper_disable_unused_functions() on the other
209 * hand throws such guarantees into the wind and calls disable hooks
210 * unconditionally on unused functions.
211 */
212void drm_helper_disable_unused_functions(struct drm_device *dev)
213{
214 if (drm_core_check_feature(dev, DRIVER_ATOMIC))
215 DRM_ERROR("Called for atomic driver, this is not what you want.\n");
216
217 drm_modeset_lock_all(dev);
218 __drm_helper_disable_unused_functions(dev);
219 drm_modeset_unlock_all(dev);
220}
221EXPORT_SYMBOL(drm_helper_disable_unused_functions);
222
223/*
224 * Check the CRTC we're going to map each output to vs. its current
225 * CRTC. If they don't match, we have to disable the output and the CRTC
226 * since the driver will have to re-route things.
227 */
228static void
229drm_crtc_prepare_encoders(struct drm_device *dev)
230{
231 const struct drm_encoder_helper_funcs *encoder_funcs;
232 struct drm_encoder *encoder;
233
234 drm_for_each_encoder(encoder, dev) {
235 encoder_funcs = encoder->helper_private;
236 if (!encoder_funcs)
237 continue;
238
239 /* Disable unused encoders */
240 if (encoder->crtc == NULL)
241 drm_encoder_disable(encoder);
242 /* Disable encoders whose CRTC is about to change */
243 if (encoder_funcs->get_crtc &&
244 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
245 drm_encoder_disable(encoder);
246 }
247}
248
249/**
250 * drm_crtc_helper_set_mode - internal helper to set a mode
251 * @crtc: CRTC to program
252 * @mode: mode to use
253 * @x: horizontal offset into the surface
254 * @y: vertical offset into the surface
255 * @old_fb: old framebuffer, for cleanup
256 *
257 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
258 * to fixup or reject the mode prior to trying to set it. This is an internal
259 * helper that drivers could e.g. use to update properties that require the
260 * entire output pipe to be disabled and re-enabled in a new configuration. For
261 * example for changing whether audio is enabled on a hdmi link or for changing
262 * panel fitter or dither attributes. It is also called by the
263 * drm_crtc_helper_set_config() helper function to drive the mode setting
264 * sequence.
265 *
266 * Returns:
267 * True if the mode was set successfully, false otherwise.
268 */
269bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
270 struct drm_display_mode *mode,
271 int x, int y,
272 struct drm_framebuffer *old_fb)
273{
274 struct drm_device *dev = crtc->dev;
275 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
276 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
277 const struct drm_encoder_helper_funcs *encoder_funcs;
278 int saved_x, saved_y;
279 bool saved_enabled;
280 struct drm_encoder *encoder;
281 bool ret = true;
282
283 drm_warn_on_modeset_not_all_locked(dev);
284
285 saved_enabled = crtc->enabled;
286 crtc->enabled = drm_helper_crtc_in_use(crtc);
287 if (!crtc->enabled)
288 return true;
289
290 adjusted_mode = drm_mode_duplicate(dev, mode);
291 if (!adjusted_mode) {
292 crtc->enabled = saved_enabled;
293 return false;
294 }
295
296 saved_mode = crtc->mode;
297 saved_hwmode = crtc->hwmode;
298 saved_x = crtc->x;
299 saved_y = crtc->y;
300
301 /* Update crtc values up front so the driver can rely on them for mode
302 * setting.
303 */
304 crtc->mode = *mode;
305 crtc->x = x;
306 crtc->y = y;
307
308 /* Pass our mode to the connectors and the CRTC to give them a chance to
309 * adjust it according to limitations or connector properties, and also
310 * a chance to reject the mode entirely.
311 */
312 drm_for_each_encoder(encoder, dev) {
313
314 if (encoder->crtc != crtc)
315 continue;
316
317 encoder_funcs = encoder->helper_private;
318 if (!encoder_funcs)
319 continue;
320
321 ret = drm_bridge_mode_fixup(encoder->bridge,
322 mode, adjusted_mode);
323 if (!ret) {
324 DRM_DEBUG_KMS("Bridge fixup failed\n");
325 goto done;
326 }
327
328 encoder_funcs = encoder->helper_private;
329 if (encoder_funcs->mode_fixup) {
330 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
331 adjusted_mode))) {
332 DRM_DEBUG_KMS("Encoder fixup failed\n");
333 goto done;
334 }
335 }
336 }
337
338 if (crtc_funcs->mode_fixup) {
339 if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
340 adjusted_mode))) {
341 DRM_DEBUG_KMS("CRTC fixup failed\n");
342 goto done;
343 }
344 }
345 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
346
347 crtc->hwmode = *adjusted_mode;
348
349 /* Prepare the encoders and CRTCs before setting the mode. */
350 drm_for_each_encoder(encoder, dev) {
351
352 if (encoder->crtc != crtc)
353 continue;
354
355 encoder_funcs = encoder->helper_private;
356 if (!encoder_funcs)
357 continue;
358
359 drm_bridge_disable(encoder->bridge);
360
361 /* Disable the encoders as the first thing we do. */
362 if (encoder_funcs->prepare)
363 encoder_funcs->prepare(encoder);
364
365 drm_bridge_post_disable(encoder->bridge);
366 }
367
368 drm_crtc_prepare_encoders(dev);
369
370 crtc_funcs->prepare(crtc);
371
372 /* Set up the DPLL and any encoders state that needs to adjust or depend
373 * on the DPLL.
374 */
375 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
376 if (!ret)
377 goto done;
378
379 drm_for_each_encoder(encoder, dev) {
380
381 if (encoder->crtc != crtc)
382 continue;
383
384 encoder_funcs = encoder->helper_private;
385 if (!encoder_funcs)
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 if (encoder_funcs->mode_set)
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 encoder_funcs = encoder->helper_private;
406 if (!encoder_funcs)
407 continue;
408
409 drm_bridge_pre_enable(encoder->bridge);
410
411 if (encoder_funcs->commit)
412 encoder_funcs->commit(encoder);
413
414 drm_bridge_enable(encoder->bridge);
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 crtc->mode = saved_mode;
429 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
438static void
439drm_crtc_helper_disable(struct drm_crtc *crtc)
440{
441 struct drm_device *dev = crtc->dev;
442 struct drm_connector *connector;
443 struct drm_encoder *encoder;
444
445 /* Decouple all encoders and their attached connectors from this crtc */
446 drm_for_each_encoder(encoder, dev) {
447 struct drm_connector_list_iter conn_iter;
448
449 if (encoder->crtc != crtc)
450 continue;
451
452 drm_connector_list_iter_begin(dev, &conn_iter);
453 drm_for_each_connector_iter(connector, &conn_iter) {
454 if (connector->encoder != encoder)
455 continue;
456
457 connector->encoder = NULL;
458
459 /*
460 * drm_helper_disable_unused_functions() ought to be
461 * doing this, but since we've decoupled the encoder
462 * from the connector above, the required connection
463 * between them is henceforth no longer available.
464 */
465 connector->dpms = DRM_MODE_DPMS_OFF;
466
467 /* we keep a reference while the encoder is bound */
468 drm_connector_put(connector);
469 }
470 drm_connector_list_iter_end(&conn_iter);
471 }
472
473 __drm_helper_disable_unused_functions(dev);
474}
475
476/**
477 * drm_crtc_helper_set_config - set a new config from userspace
478 * @set: mode set configuration
479 * @ctx: lock acquire context, not used here
480 *
481 * The drm_crtc_helper_set_config() helper function implements the of
482 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
483 * helpers.
484 *
485 * It first tries to locate the best encoder for each connector by calling the
486 * connector @drm_connector_helper_funcs.best_encoder helper operation.
487 *
488 * After locating the appropriate encoders, the helper function will call the
489 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
490 * or reject it completely in which case an error will be returned to the
491 * application. If the new configuration after mode adjustment is identical to
492 * the current configuration the helper function will return without performing
493 * any other operation.
494 *
495 * If the adjusted mode is identical to the current mode but changes to the
496 * frame buffer need to be applied, the drm_crtc_helper_set_config() function
497 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
498 *
499 * If the adjusted mode differs from the current mode, or if the
500 * ->mode_set_base() helper operation is not provided, the helper function
501 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
502 * and ->commit() CRTC and encoder helper operations, in that order.
503 * Alternatively it can also use the dpms and disable helper operations. For
504 * details see &struct drm_crtc_helper_funcs and struct
505 * &drm_encoder_helper_funcs.
506 *
507 * This function is deprecated. New drivers must implement atomic modeset
508 * support, for which this function is unsuitable. Instead drivers should use
509 * drm_atomic_helper_set_config().
510 *
511 * Returns:
512 * Returns 0 on success, negative errno numbers on failure.
513 */
514int drm_crtc_helper_set_config(struct drm_mode_set *set,
515 struct drm_modeset_acquire_ctx *ctx)
516{
517 struct drm_device *dev;
518 struct drm_crtc **save_encoder_crtcs, *new_crtc;
519 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
520 bool mode_changed = false; /* if true do a full mode set */
521 bool fb_changed = false; /* if true and !mode_changed just do a flip */
522 struct drm_connector *connector;
523 struct drm_connector_list_iter conn_iter;
524 int count = 0, ro, fail = 0;
525 const struct drm_crtc_helper_funcs *crtc_funcs;
526 struct drm_mode_set save_set;
527 int ret;
528 int i;
529
530 DRM_DEBUG_KMS("\n");
531
532 BUG_ON(!set);
533 BUG_ON(!set->crtc);
534 BUG_ON(!set->crtc->helper_private);
535
536 /* Enforce sane interface api - has been abused by the fb helper. */
537 BUG_ON(!set->mode && set->fb);
538 BUG_ON(set->fb && set->num_connectors == 0);
539
540 crtc_funcs = set->crtc->helper_private;
541
542 if (!set->mode)
543 set->fb = NULL;
544
545 if (set->fb) {
546 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
547 set->crtc->base.id, set->crtc->name,
548 set->fb->base.id,
549 (int)set->num_connectors, set->x, set->y);
550 } else {
551 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
552 set->crtc->base.id, set->crtc->name);
553 drm_crtc_helper_disable(set->crtc);
554 return 0;
555 }
556
557 dev = set->crtc->dev;
558
559 drm_warn_on_modeset_not_all_locked(dev);
560
561 /*
562 * Allocate space for the backup of all (non-pointer) encoder and
563 * connector data.
564 */
565 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder,
566 sizeof(struct drm_crtc *), GFP_KERNEL);
567 if (!save_encoder_crtcs)
568 return -ENOMEM;
569
570 save_connector_encoders = kcalloc(dev->mode_config.num_connector,
571 sizeof(struct drm_encoder *), GFP_KERNEL);
572 if (!save_connector_encoders) {
573 kfree(save_encoder_crtcs);
574 return -ENOMEM;
575 }
576
577 /*
578 * Copy data. Note that driver private data is not affected.
579 * Should anything bad happen only the expected state is
580 * restored, not the drivers personal bookkeeping.
581 */
582 count = 0;
583 drm_for_each_encoder(encoder, dev) {
584 save_encoder_crtcs[count++] = encoder->crtc;
585 }
586
587 count = 0;
588 drm_connector_list_iter_begin(dev, &conn_iter);
589 drm_for_each_connector_iter(connector, &conn_iter)
590 save_connector_encoders[count++] = connector->encoder;
591 drm_connector_list_iter_end(&conn_iter);
592
593 save_set.crtc = set->crtc;
594 save_set.mode = &set->crtc->mode;
595 save_set.x = set->crtc->x;
596 save_set.y = set->crtc->y;
597 save_set.fb = set->crtc->primary->fb;
598
599 /* We should be able to check here if the fb has the same properties
600 * and then just flip_or_move it */
601 if (set->crtc->primary->fb != set->fb) {
602 /* If we have no fb then treat it as a full mode set */
603 if (set->crtc->primary->fb == NULL) {
604 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
605 mode_changed = true;
606 } else if (set->fb->format != set->crtc->primary->fb->format) {
607 mode_changed = true;
608 } else
609 fb_changed = true;
610 }
611
612 if (set->x != set->crtc->x || set->y != set->crtc->y)
613 fb_changed = true;
614
615 if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
616 DRM_DEBUG_KMS("modes are different, full mode set\n");
617 drm_mode_debug_printmodeline(&set->crtc->mode);
618 drm_mode_debug_printmodeline(set->mode);
619 mode_changed = true;
620 }
621
622 /* take a reference on all unbound connectors in set, reuse the
623 * already taken reference for bound connectors
624 */
625 for (ro = 0; ro < set->num_connectors; ro++) {
626 if (set->connectors[ro]->encoder)
627 continue;
628 drm_connector_get(set->connectors[ro]);
629 }
630
631 /* a) traverse passed in connector list and get encoders for them */
632 count = 0;
633 drm_connector_list_iter_begin(dev, &conn_iter);
634 drm_for_each_connector_iter(connector, &conn_iter) {
635 const struct drm_connector_helper_funcs *connector_funcs =
636 connector->helper_private;
637 new_encoder = connector->encoder;
638 for (ro = 0; ro < set->num_connectors; ro++) {
639 if (set->connectors[ro] == connector) {
640 new_encoder = connector_funcs->best_encoder(connector);
641 /* if we can't get an encoder for a connector
642 we are setting now - then fail */
643 if (new_encoder == NULL)
644 /* don't break so fail path works correct */
645 fail = 1;
646
647 if (connector->dpms != DRM_MODE_DPMS_ON) {
648 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
649 mode_changed = true;
650 }
651
652 break;
653 }
654 }
655
656 if (new_encoder != connector->encoder) {
657 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
658 mode_changed = true;
659 /* If the encoder is reused for another connector, then
660 * the appropriate crtc will be set later.
661 */
662 if (connector->encoder)
663 connector->encoder->crtc = NULL;
664 connector->encoder = new_encoder;
665 }
666 }
667 drm_connector_list_iter_end(&conn_iter);
668
669 if (fail) {
670 ret = -EINVAL;
671 goto fail;
672 }
673
674 count = 0;
675 drm_connector_list_iter_begin(dev, &conn_iter);
676 drm_for_each_connector_iter(connector, &conn_iter) {
677 if (!connector->encoder)
678 continue;
679
680 if (connector->encoder->crtc == set->crtc)
681 new_crtc = NULL;
682 else
683 new_crtc = connector->encoder->crtc;
684
685 for (ro = 0; ro < set->num_connectors; ro++) {
686 if (set->connectors[ro] == connector)
687 new_crtc = set->crtc;
688 }
689
690 /* Make sure the new CRTC will work with the encoder */
691 if (new_crtc &&
692 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
693 ret = -EINVAL;
694 drm_connector_list_iter_end(&conn_iter);
695 goto fail;
696 }
697 if (new_crtc != connector->encoder->crtc) {
698 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
699 mode_changed = true;
700 connector->encoder->crtc = new_crtc;
701 }
702 if (new_crtc) {
703 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
704 connector->base.id, connector->name,
705 new_crtc->base.id, new_crtc->name);
706 } else {
707 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
708 connector->base.id, connector->name);
709 }
710 }
711 drm_connector_list_iter_end(&conn_iter);
712
713 /* mode_set_base is not a required function */
714 if (fb_changed && !crtc_funcs->mode_set_base)
715 mode_changed = true;
716
717 if (mode_changed) {
718 if (drm_helper_crtc_in_use(set->crtc)) {
719 DRM_DEBUG_KMS("attempting to set mode from"
720 " userspace\n");
721 drm_mode_debug_printmodeline(set->mode);
722 set->crtc->primary->fb = set->fb;
723 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
724 set->x, set->y,
725 save_set.fb)) {
726 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
727 set->crtc->base.id, set->crtc->name);
728 set->crtc->primary->fb = save_set.fb;
729 ret = -EINVAL;
730 goto fail;
731 }
732 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
733 for (i = 0; i < set->num_connectors; i++) {
734 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
735 set->connectors[i]->name);
736 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
737 }
738 }
739 __drm_helper_disable_unused_functions(dev);
740 } else if (fb_changed) {
741 set->crtc->x = set->x;
742 set->crtc->y = set->y;
743 set->crtc->primary->fb = set->fb;
744 ret = crtc_funcs->mode_set_base(set->crtc,
745 set->x, set->y, save_set.fb);
746 if (ret != 0) {
747 set->crtc->x = save_set.x;
748 set->crtc->y = save_set.y;
749 set->crtc->primary->fb = save_set.fb;
750 goto fail;
751 }
752 }
753
754 kfree(save_connector_encoders);
755 kfree(save_encoder_crtcs);
756 return 0;
757
758fail:
759 /* Restore all previous data. */
760 count = 0;
761 drm_for_each_encoder(encoder, dev) {
762 encoder->crtc = save_encoder_crtcs[count++];
763 }
764
765 count = 0;
766 drm_connector_list_iter_begin(dev, &conn_iter);
767 drm_for_each_connector_iter(connector, &conn_iter)
768 connector->encoder = save_connector_encoders[count++];
769 drm_connector_list_iter_end(&conn_iter);
770
771 /* after fail drop reference on all unbound connectors in set, let
772 * bound connectors keep their reference
773 */
774 for (ro = 0; ro < set->num_connectors; ro++) {
775 if (set->connectors[ro]->encoder)
776 continue;
777 drm_connector_put(set->connectors[ro]);
778 }
779
780 /* Try to restore the config */
781 if (mode_changed &&
782 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
783 save_set.y, save_set.fb))
784 DRM_ERROR("failed to restore config after modeset failure\n");
785
786 kfree(save_connector_encoders);
787 kfree(save_encoder_crtcs);
788 return ret;
789}
790EXPORT_SYMBOL(drm_crtc_helper_set_config);
791
792static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
793{
794 int dpms = DRM_MODE_DPMS_OFF;
795 struct drm_connector *connector;
796 struct drm_connector_list_iter conn_iter;
797 struct drm_device *dev = encoder->dev;
798
799 drm_connector_list_iter_begin(dev, &conn_iter);
800 drm_for_each_connector_iter(connector, &conn_iter)
801 if (connector->encoder == encoder)
802 if (connector->dpms < dpms)
803 dpms = connector->dpms;
804 drm_connector_list_iter_end(&conn_iter);
805
806 return dpms;
807}
808
809/* Helper which handles bridge ordering around encoder dpms */
810static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
811{
812 struct drm_bridge *bridge = encoder->bridge;
813 const struct drm_encoder_helper_funcs *encoder_funcs;
814
815 encoder_funcs = encoder->helper_private;
816 if (!encoder_funcs)
817 return;
818
819 if (mode == DRM_MODE_DPMS_ON)
820 drm_bridge_pre_enable(bridge);
821 else
822 drm_bridge_disable(bridge);
823
824 if (encoder_funcs->dpms)
825 encoder_funcs->dpms(encoder, mode);
826
827 if (mode == DRM_MODE_DPMS_ON)
828 drm_bridge_enable(bridge);
829 else
830 drm_bridge_post_disable(bridge);
831}
832
833static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
834{
835 int dpms = DRM_MODE_DPMS_OFF;
836 struct drm_connector *connector;
837 struct drm_connector_list_iter conn_iter;
838 struct drm_device *dev = crtc->dev;
839
840 drm_connector_list_iter_begin(dev, &conn_iter);
841 drm_for_each_connector_iter(connector, &conn_iter)
842 if (connector->encoder && connector->encoder->crtc == crtc)
843 if (connector->dpms < dpms)
844 dpms = connector->dpms;
845 drm_connector_list_iter_end(&conn_iter);
846
847 return dpms;
848}
849
850/**
851 * drm_helper_connector_dpms() - connector dpms helper implementation
852 * @connector: affected connector
853 * @mode: DPMS mode
854 *
855 * The drm_helper_connector_dpms() helper function implements the
856 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
857 * helpers.
858 *
859 * This is the main helper function provided by the CRTC helper framework for
860 * implementing the DPMS connector attribute. It computes the new desired DPMS
861 * state for all encoders and CRTCs in the output mesh and calls the
862 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
863 * provided by the driver.
864 *
865 * This function is deprecated. New drivers must implement atomic modeset
866 * support, where DPMS is handled in the DRM core.
867 *
868 * Returns:
869 * Always returns 0.
870 */
871int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
872{
873 struct drm_encoder *encoder = connector->encoder;
874 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
875 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
876
877 if (mode == connector->dpms)
878 return 0;
879
880 old_dpms = connector->dpms;
881 connector->dpms = mode;
882
883 if (encoder)
884 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
885
886 /* from off to on, do crtc then encoder */
887 if (mode < old_dpms) {
888 if (crtc) {
889 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
890 if (crtc_funcs->dpms)
891 (*crtc_funcs->dpms) (crtc,
892 drm_helper_choose_crtc_dpms(crtc));
893 }
894 if (encoder)
895 drm_helper_encoder_dpms(encoder, encoder_dpms);
896 }
897
898 /* from on to off, do encoder then crtc */
899 if (mode > old_dpms) {
900 if (encoder)
901 drm_helper_encoder_dpms(encoder, encoder_dpms);
902 if (crtc) {
903 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
904 if (crtc_funcs->dpms)
905 (*crtc_funcs->dpms) (crtc,
906 drm_helper_choose_crtc_dpms(crtc));
907 }
908 }
909
910 return 0;
911}
912EXPORT_SYMBOL(drm_helper_connector_dpms);
913
914/**
915 * drm_helper_resume_force_mode - force-restore mode setting configuration
916 * @dev: drm_device which should be restored
917 *
918 * Drivers which use the mode setting helpers can use this function to
919 * force-restore the mode setting configuration e.g. on resume or when something
920 * else might have trampled over the hw state (like some overzealous old BIOSen
921 * tended to do).
922 *
923 * This helper doesn't provide a error return value since restoring the old
924 * config should never fail due to resource allocation issues since the driver
925 * has successfully set the restored configuration already. Hence this should
926 * boil down to the equivalent of a few dpms on calls, which also don't provide
927 * an error code.
928 *
929 * Drivers where simply restoring an old configuration again might fail (e.g.
930 * due to slight differences in allocating shared resources when the
931 * configuration is restored in a different order than when userspace set it up)
932 * need to use their own restore logic.
933 *
934 * This function is deprecated. New drivers should implement atomic mode-
935 * setting and use the atomic suspend/resume helpers.
936 *
937 * See also:
938 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
939 */
940void drm_helper_resume_force_mode(struct drm_device *dev)
941{
942 struct drm_crtc *crtc;
943 struct drm_encoder *encoder;
944 const struct drm_crtc_helper_funcs *crtc_funcs;
945 int encoder_dpms;
946 bool ret;
947
948 drm_modeset_lock_all(dev);
949 drm_for_each_crtc(crtc, dev) {
950
951 if (!crtc->enabled)
952 continue;
953
954 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
955 crtc->x, crtc->y, crtc->primary->fb);
956
957 /* Restoring the old config should never fail! */
958 if (ret == false)
959 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
960
961 /* Turn off outputs that were already powered off */
962 if (drm_helper_choose_crtc_dpms(crtc)) {
963 drm_for_each_encoder(encoder, dev) {
964
965 if(encoder->crtc != crtc)
966 continue;
967
968 encoder_dpms = drm_helper_choose_encoder_dpms(
969 encoder);
970
971 drm_helper_encoder_dpms(encoder, encoder_dpms);
972 }
973
974 crtc_funcs = crtc->helper_private;
975 if (crtc_funcs->dpms)
976 (*crtc_funcs->dpms) (crtc,
977 drm_helper_choose_crtc_dpms(crtc));
978 }
979 }
980
981 /* disable the unused connectors while restoring the modesetting */
982 __drm_helper_disable_unused_functions(dev);
983 drm_modeset_unlock_all(dev);
984}
985EXPORT_SYMBOL(drm_helper_resume_force_mode);
986
987/**
988 * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers
989 * @crtc: DRM CRTC
990 * @mode: DRM display mode which userspace requested
991 * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks
992 * @x: x offset of the CRTC scanout area on the underlying framebuffer
993 * @y: y offset of the CRTC scanout area on the underlying framebuffer
994 * @old_fb: previous framebuffer
995 *
996 * This function implements a callback useable as the ->mode_set callback
997 * required by the CRTC helpers. Besides the atomic plane helper functions for
998 * the primary plane the driver must also provide the ->mode_set_nofb callback
999 * to set up the CRTC.
1000 *
1001 * This is a transitional helper useful for converting drivers to the atomic
1002 * interfaces.
1003 */
1004int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
1005 struct drm_display_mode *adjusted_mode, int x, int y,
1006 struct drm_framebuffer *old_fb)
1007{
1008 struct drm_crtc_state *crtc_state;
1009 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
1010 int ret;
1011
1012 if (crtc->funcs->atomic_duplicate_state)
1013 crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
1014 else {
1015 if (!crtc->state)
1016 drm_atomic_helper_crtc_reset(crtc);
1017
1018 crtc_state = drm_atomic_helper_crtc_duplicate_state(crtc);
1019 }
1020
1021 if (!crtc_state)
1022 return -ENOMEM;
1023
1024 crtc_state->planes_changed = true;
1025 crtc_state->mode_changed = true;
1026 ret = drm_atomic_set_mode_for_crtc(crtc_state, mode);
1027 if (ret)
1028 goto out;
1029 drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode);
1030
1031 if (crtc_funcs->atomic_check) {
1032 ret = crtc_funcs->atomic_check(crtc, crtc_state);
1033 if (ret)
1034 goto out;
1035 }
1036
1037 swap(crtc->state, crtc_state);
1038
1039 crtc_funcs->mode_set_nofb(crtc);
1040
1041 ret = drm_helper_crtc_mode_set_base(crtc, x, y, old_fb);
1042
1043out:
1044 if (crtc_state) {
1045 if (crtc->funcs->atomic_destroy_state)
1046 crtc->funcs->atomic_destroy_state(crtc, crtc_state);
1047 else
1048 drm_atomic_helper_crtc_destroy_state(crtc, crtc_state);
1049 }
1050
1051 return ret;
1052}
1053EXPORT_SYMBOL(drm_helper_crtc_mode_set);
1054
1055/**
1056 * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers
1057 * @crtc: DRM CRTC
1058 * @x: x offset of the CRTC scanout area on the underlying framebuffer
1059 * @y: y offset of the CRTC scanout area on the underlying framebuffer
1060 * @old_fb: previous framebuffer
1061 *
1062 * This function implements a callback useable as the ->mode_set_base used
1063 * required by the CRTC helpers. The driver must provide the atomic plane helper
1064 * functions for the primary plane.
1065 *
1066 * This is a transitional helper useful for converting drivers to the atomic
1067 * interfaces.
1068 */
1069int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
1070 struct drm_framebuffer *old_fb)
1071{
1072 struct drm_plane_state *plane_state;
1073 struct drm_plane *plane = crtc->primary;
1074
1075 if (plane->funcs->atomic_duplicate_state)
1076 plane_state = plane->funcs->atomic_duplicate_state(plane);
1077 else {
1078 if (!plane->state)
1079 drm_atomic_helper_plane_reset(plane);
1080
1081 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
1082 }
1083 if (!plane_state)
1084 return -ENOMEM;
1085 plane_state->plane = plane;
1086
1087 plane_state->crtc = crtc;
1088 drm_atomic_set_fb_for_plane(plane_state, crtc->primary->fb);
1089 plane_state->crtc_x = 0;
1090 plane_state->crtc_y = 0;
1091 plane_state->crtc_h = crtc->mode.vdisplay;
1092 plane_state->crtc_w = crtc->mode.hdisplay;
1093 plane_state->src_x = x << 16;
1094 plane_state->src_y = y << 16;
1095 plane_state->src_h = crtc->mode.vdisplay << 16;
1096 plane_state->src_w = crtc->mode.hdisplay << 16;
1097
1098 return drm_plane_helper_commit(plane, plane_state, old_fb);
1099}
1100EXPORT_SYMBOL(drm_helper_crtc_mode_set_base);