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