drm: Propagate failure from setting crtc base.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / gpu / drm / drm_crtc_helper.c
blob733028b4d45e413e9d1689cd73a5fdec0618a982
1 /*
2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
5 * DRM core CRTC related functions
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.
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.
25 * Authors:
26 * Keith Packard
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
32 #include "drmP.h"
33 #include "drm_crtc.h"
34 #include "drm_crtc_helper.h"
37 * Detailed mode info for 800x600@60Hz
39 static struct drm_display_mode std_modes[] = {
40 { DRM_MODE("800x600", DRM_MODE_TYPE_DEFAULT, 40000, 800, 840,
41 968, 1056, 0, 600, 601, 605, 628, 0,
42 DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC) },
45 /**
46 * drm_helper_probe_connector_modes - get complete set of display modes
47 * @dev: DRM device
48 * @maxX: max width for modes
49 * @maxY: max height for modes
51 * LOCKING:
52 * Caller must hold mode config lock.
54 * Based on @dev's mode_config layout, scan all the connectors and try to detect
55 * modes on them. Modes will first be added to the connector's probed_modes
56 * list, then culled (based on validity and the @maxX, @maxY parameters) and
57 * put into the normal modes list.
59 * Intended to be used either at bootup time or when major configuration
60 * changes have occurred.
62 * FIXME: take into account monitor limits
64 * RETURNS:
65 * Number of modes found on @connector.
67 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
68 uint32_t maxX, uint32_t maxY)
70 struct drm_device *dev = connector->dev;
71 struct drm_display_mode *mode, *t;
72 struct drm_connector_helper_funcs *connector_funcs =
73 connector->helper_private;
74 int count = 0;
76 DRM_DEBUG("%s\n", drm_get_connector_name(connector));
77 /* set all modes to the unverified state */
78 list_for_each_entry_safe(mode, t, &connector->modes, head)
79 mode->status = MODE_UNVERIFIED;
81 connector->status = connector->funcs->detect(connector);
83 if (connector->status == connector_status_disconnected) {
84 DRM_DEBUG("%s is disconnected\n",
85 drm_get_connector_name(connector));
86 /* TODO set EDID to NULL */
87 return 0;
90 count = (*connector_funcs->get_modes)(connector);
91 if (!count)
92 return 0;
94 drm_mode_connector_list_update(connector);
96 if (maxX && maxY)
97 drm_mode_validate_size(dev, &connector->modes, maxX,
98 maxY, 0);
99 list_for_each_entry_safe(mode, t, &connector->modes, head) {
100 if (mode->status == MODE_OK)
101 mode->status = connector_funcs->mode_valid(connector,
102 mode);
106 drm_mode_prune_invalid(dev, &connector->modes, true);
108 if (list_empty(&connector->modes))
109 return 0;
111 drm_mode_sort(&connector->modes);
113 DRM_DEBUG("Probed modes for %s\n", drm_get_connector_name(connector));
114 list_for_each_entry_safe(mode, t, &connector->modes, head) {
115 mode->vrefresh = drm_mode_vrefresh(mode);
117 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
118 drm_mode_debug_printmodeline(mode);
121 return count;
123 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
125 int drm_helper_probe_connector_modes(struct drm_device *dev, uint32_t maxX,
126 uint32_t maxY)
128 struct drm_connector *connector;
129 int count = 0;
131 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
132 count += drm_helper_probe_single_connector_modes(connector,
133 maxX, maxY);
136 return count;
138 EXPORT_SYMBOL(drm_helper_probe_connector_modes);
140 static void drm_helper_add_std_modes(struct drm_device *dev,
141 struct drm_connector *connector)
143 struct drm_display_mode *mode, *t;
144 int i;
146 for (i = 0; i < ARRAY_SIZE(std_modes); i++) {
147 struct drm_display_mode *stdmode;
150 * When no valid EDID modes are available we end up
151 * here and bailed in the past, now we add some standard
152 * modes and move on.
154 stdmode = drm_mode_duplicate(dev, &std_modes[i]);
155 drm_mode_probed_add(connector, stdmode);
156 drm_mode_list_concat(&connector->probed_modes,
157 &connector->modes);
159 DRM_DEBUG("Adding mode %s to %s\n", stdmode->name,
160 drm_get_connector_name(connector));
162 drm_mode_sort(&connector->modes);
164 DRM_DEBUG("Added std modes on %s\n", drm_get_connector_name(connector));
165 list_for_each_entry_safe(mode, t, &connector->modes, head) {
166 mode->vrefresh = drm_mode_vrefresh(mode);
168 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
169 drm_mode_debug_printmodeline(mode);
174 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
175 * @crtc: CRTC to check
177 * LOCKING:
178 * Caller must hold mode config lock.
180 * Walk @crtc's DRM device's mode_config and see if it's in use.
182 * RETURNS:
183 * True if @crtc is part of the mode_config, false otherwise.
185 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
187 struct drm_encoder *encoder;
188 struct drm_device *dev = crtc->dev;
189 /* FIXME: Locking around list access? */
190 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
191 if (encoder->crtc == crtc)
192 return true;
193 return false;
195 EXPORT_SYMBOL(drm_helper_crtc_in_use);
198 * drm_disable_unused_functions - disable unused objects
199 * @dev: DRM device
201 * LOCKING:
202 * Caller must hold mode config lock.
204 * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
205 * by calling its dpms function, which should power it off.
207 void drm_helper_disable_unused_functions(struct drm_device *dev)
209 struct drm_encoder *encoder;
210 struct drm_encoder_helper_funcs *encoder_funcs;
211 struct drm_crtc *crtc;
213 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
214 encoder_funcs = encoder->helper_private;
215 if (!encoder->crtc)
216 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
219 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
220 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
221 crtc->enabled = drm_helper_crtc_in_use(crtc);
222 if (!crtc->enabled) {
223 crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
224 crtc->fb = NULL;
228 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
230 static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *connector, int width, int height)
232 struct drm_display_mode *mode;
234 list_for_each_entry(mode, &connector->modes, head) {
235 if (drm_mode_width(mode) > width ||
236 drm_mode_height(mode) > height)
237 continue;
238 if (mode->type & DRM_MODE_TYPE_PREFERRED)
239 return mode;
241 return NULL;
244 static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
246 bool enable;
248 if (strict) {
249 enable = connector->status == connector_status_connected;
250 } else {
251 enable = connector->status != connector_status_disconnected;
253 return enable;
256 static void drm_enable_connectors(struct drm_device *dev, bool *enabled)
258 bool any_enabled = false;
259 struct drm_connector *connector;
260 int i = 0;
262 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
263 enabled[i] = drm_connector_enabled(connector, true);
264 DRM_DEBUG("connector %d enabled? %s\n", connector->base.id,
265 enabled[i] ? "yes" : "no");
266 any_enabled |= enabled[i];
267 i++;
270 if (any_enabled)
271 return;
273 i = 0;
274 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
275 enabled[i] = drm_connector_enabled(connector, false);
276 i++;
280 static bool drm_target_preferred(struct drm_device *dev,
281 struct drm_display_mode **modes,
282 bool *enabled, int width, int height)
284 struct drm_connector *connector;
285 int i = 0;
287 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
289 if (enabled[i] == false) {
290 i++;
291 continue;
294 DRM_DEBUG("looking for preferred mode on connector %d\n",
295 connector->base.id);
297 modes[i] = drm_has_preferred_mode(connector, width, height);
298 /* No preferred modes, pick one off the list */
299 if (!modes[i] && !list_empty(&connector->modes)) {
300 list_for_each_entry(modes[i], &connector->modes, head)
301 break;
303 DRM_DEBUG("found mode %s\n", modes[i] ? modes[i]->name :
304 "none");
305 i++;
307 return true;
310 static int drm_pick_crtcs(struct drm_device *dev,
311 struct drm_crtc **best_crtcs,
312 struct drm_display_mode **modes,
313 int n, int width, int height)
315 int c, o;
316 struct drm_connector *connector;
317 struct drm_connector_helper_funcs *connector_funcs;
318 struct drm_encoder *encoder;
319 struct drm_crtc *best_crtc;
320 int my_score, best_score, score;
321 struct drm_crtc **crtcs, *crtc;
323 if (n == dev->mode_config.num_connector)
324 return 0;
325 c = 0;
326 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
327 if (c == n)
328 break;
329 c++;
332 best_crtcs[n] = NULL;
333 best_crtc = NULL;
334 best_score = drm_pick_crtcs(dev, best_crtcs, modes, n+1, width, height);
335 if (modes[n] == NULL)
336 return best_score;
338 crtcs = kmalloc(dev->mode_config.num_connector *
339 sizeof(struct drm_crtc *), GFP_KERNEL);
340 if (!crtcs)
341 return best_score;
343 my_score = 1;
344 if (connector->status == connector_status_connected)
345 my_score++;
346 if (drm_has_preferred_mode(connector, width, height))
347 my_score++;
349 connector_funcs = connector->helper_private;
350 encoder = connector_funcs->best_encoder(connector);
351 if (!encoder)
352 goto out;
354 connector->encoder = encoder;
356 /* select a crtc for this connector and then attempt to configure
357 remaining connectors */
358 c = 0;
359 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
361 if ((connector->encoder->possible_crtcs & (1 << c)) == 0) {
362 c++;
363 continue;
366 for (o = 0; o < n; o++)
367 if (best_crtcs[o] == crtc)
368 break;
370 if (o < n) {
371 /* ignore cloning for now */
372 c++;
373 continue;
376 crtcs[n] = crtc;
377 memcpy(crtcs, best_crtcs, n * sizeof(struct drm_crtc *));
378 score = my_score + drm_pick_crtcs(dev, crtcs, modes, n + 1,
379 width, height);
380 if (score > best_score) {
381 best_crtc = crtc;
382 best_score = score;
383 memcpy(best_crtcs, crtcs,
384 dev->mode_config.num_connector *
385 sizeof(struct drm_crtc *));
387 c++;
389 out:
390 kfree(crtcs);
391 return best_score;
394 static void drm_setup_crtcs(struct drm_device *dev)
396 struct drm_crtc **crtcs;
397 struct drm_display_mode **modes;
398 struct drm_encoder *encoder;
399 struct drm_connector *connector;
400 bool *enabled;
401 int width, height;
402 int i, ret;
404 DRM_DEBUG("\n");
406 width = dev->mode_config.max_width;
407 height = dev->mode_config.max_height;
409 /* clean out all the encoder/crtc combos */
410 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
411 encoder->crtc = NULL;
414 crtcs = kcalloc(dev->mode_config.num_connector,
415 sizeof(struct drm_crtc *), GFP_KERNEL);
416 modes = kcalloc(dev->mode_config.num_connector,
417 sizeof(struct drm_display_mode *), GFP_KERNEL);
418 enabled = kcalloc(dev->mode_config.num_connector,
419 sizeof(bool), GFP_KERNEL);
421 drm_enable_connectors(dev, enabled);
423 ret = drm_target_preferred(dev, modes, enabled, width, height);
424 if (!ret)
425 DRM_ERROR("Unable to find initial modes\n");
427 DRM_DEBUG("picking CRTCs for %dx%d config\n", width, height);
429 drm_pick_crtcs(dev, crtcs, modes, 0, width, height);
431 i = 0;
432 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
433 struct drm_display_mode *mode = modes[i];
434 struct drm_crtc *crtc = crtcs[i];
436 if (connector->encoder == NULL) {
437 i++;
438 continue;
441 if (mode && crtc) {
442 DRM_DEBUG("desired mode %s set on crtc %d\n",
443 mode->name, crtc->base.id);
444 crtc->desired_mode = mode;
445 connector->encoder->crtc = crtc;
446 } else
447 connector->encoder->crtc = NULL;
448 i++;
451 kfree(crtcs);
452 kfree(modes);
453 kfree(enabled);
456 * drm_crtc_set_mode - set a mode
457 * @crtc: CRTC to program
458 * @mode: mode to use
459 * @x: width of mode
460 * @y: height of mode
462 * LOCKING:
463 * Caller must hold mode config lock.
465 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
466 * to fixup or reject the mode prior to trying to set it.
468 * RETURNS:
469 * True if the mode was set successfully, or false otherwise.
471 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
472 struct drm_display_mode *mode,
473 int x, int y,
474 struct drm_framebuffer *old_fb)
476 struct drm_device *dev = crtc->dev;
477 struct drm_display_mode *adjusted_mode, saved_mode;
478 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
479 struct drm_encoder_helper_funcs *encoder_funcs;
480 int saved_x, saved_y;
481 struct drm_encoder *encoder;
482 bool ret = true;
483 bool depth_changed, bpp_changed;
485 adjusted_mode = drm_mode_duplicate(dev, mode);
487 crtc->enabled = drm_helper_crtc_in_use(crtc);
489 if (!crtc->enabled)
490 return true;
492 if (old_fb && crtc->fb) {
493 depth_changed = (old_fb->depth != crtc->fb->depth);
494 bpp_changed = (old_fb->bits_per_pixel !=
495 crtc->fb->bits_per_pixel);
496 } else {
497 depth_changed = true;
498 bpp_changed = true;
501 saved_mode = crtc->mode;
502 saved_x = crtc->x;
503 saved_y = crtc->y;
505 /* Update crtc values up front so the driver can rely on them for mode
506 * setting.
508 crtc->mode = *mode;
509 crtc->x = x;
510 crtc->y = y;
512 if (drm_mode_equal(&saved_mode, &crtc->mode)) {
513 if (saved_x != crtc->x || saved_y != crtc->y ||
514 depth_changed || bpp_changed) {
515 ret = !crtc_funcs->mode_set_base(crtc, crtc->x, crtc->y,
516 old_fb);
517 goto done;
521 /* Pass our mode to the connectors and the CRTC to give them a chance to
522 * adjust it according to limitations or connector properties, and also
523 * a chance to reject the mode entirely.
525 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
527 if (encoder->crtc != crtc)
528 continue;
529 encoder_funcs = encoder->helper_private;
530 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
531 adjusted_mode))) {
532 goto done;
536 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
537 goto done;
540 /* Prepare the encoders and CRTCs before setting the mode. */
541 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
543 if (encoder->crtc != crtc)
544 continue;
545 encoder_funcs = encoder->helper_private;
546 /* Disable the encoders as the first thing we do. */
547 encoder_funcs->prepare(encoder);
550 crtc_funcs->prepare(crtc);
552 /* Set up the DPLL and any encoders state that needs to adjust or depend
553 * on the DPLL.
555 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
556 if (!ret)
557 goto done;
559 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
561 if (encoder->crtc != crtc)
562 continue;
564 DRM_INFO("%s: set mode %s %x\n", drm_get_encoder_name(encoder),
565 mode->name, mode->base.id);
566 encoder_funcs = encoder->helper_private;
567 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
570 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
571 crtc_funcs->commit(crtc);
573 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
575 if (encoder->crtc != crtc)
576 continue;
578 encoder_funcs = encoder->helper_private;
579 encoder_funcs->commit(encoder);
583 /* XXX free adjustedmode */
584 drm_mode_destroy(dev, adjusted_mode);
585 /* FIXME: add subpixel order */
586 done:
587 if (!ret) {
588 crtc->mode = saved_mode;
589 crtc->x = saved_x;
590 crtc->y = saved_y;
593 return ret;
595 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
599 * drm_crtc_helper_set_config - set a new config from userspace
600 * @crtc: CRTC to setup
601 * @crtc_info: user provided configuration
602 * @new_mode: new mode to set
603 * @connector_set: set of connectors for the new config
604 * @fb: new framebuffer
606 * LOCKING:
607 * Caller must hold mode config lock.
609 * Setup a new configuration, provided by the user in @crtc_info, and enable
610 * it.
612 * RETURNS:
613 * Zero. (FIXME)
615 int drm_crtc_helper_set_config(struct drm_mode_set *set)
617 struct drm_device *dev;
618 struct drm_crtc **save_crtcs, *new_crtc;
619 struct drm_encoder **save_encoders, *new_encoder;
620 struct drm_framebuffer *old_fb;
621 bool save_enabled;
622 bool mode_changed = false;
623 bool fb_changed = false;
624 struct drm_connector *connector;
625 int count = 0, ro, fail = 0;
626 struct drm_crtc_helper_funcs *crtc_funcs;
627 int ret = 0;
629 DRM_DEBUG("\n");
631 if (!set)
632 return -EINVAL;
634 if (!set->crtc)
635 return -EINVAL;
637 if (!set->crtc->helper_private)
638 return -EINVAL;
640 crtc_funcs = set->crtc->helper_private;
642 DRM_DEBUG("crtc: %p %d fb: %p connectors: %p num_connectors: %d (x, y) (%i, %i)\n",
643 set->crtc, set->crtc->base.id, set->fb, set->connectors,
644 (int)set->num_connectors, set->x, set->y);
646 dev = set->crtc->dev;
648 /* save previous config */
649 save_enabled = set->crtc->enabled;
652 * We do mode_config.num_connectors here since we'll look at the
653 * CRTC and encoder associated with each connector later.
655 save_crtcs = kzalloc(dev->mode_config.num_connector *
656 sizeof(struct drm_crtc *), GFP_KERNEL);
657 if (!save_crtcs)
658 return -ENOMEM;
660 save_encoders = kzalloc(dev->mode_config.num_connector *
661 sizeof(struct drm_encoders *), GFP_KERNEL);
662 if (!save_encoders) {
663 kfree(save_crtcs);
664 return -ENOMEM;
667 /* We should be able to check here if the fb has the same properties
668 * and then just flip_or_move it */
669 if (set->crtc->fb != set->fb) {
670 /* If we have no fb then treat it as a full mode set */
671 if (set->crtc->fb == NULL)
672 mode_changed = true;
673 else if ((set->fb->bits_per_pixel !=
674 set->crtc->fb->bits_per_pixel) ||
675 set->fb->depth != set->crtc->fb->depth)
676 fb_changed = true;
677 else
678 fb_changed = true;
681 if (set->x != set->crtc->x || set->y != set->crtc->y)
682 fb_changed = true;
684 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
685 DRM_DEBUG("modes are different\n");
686 drm_mode_debug_printmodeline(&set->crtc->mode);
687 drm_mode_debug_printmodeline(set->mode);
688 mode_changed = true;
691 /* a) traverse passed in connector list and get encoders for them */
692 count = 0;
693 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
694 struct drm_connector_helper_funcs *connector_funcs =
695 connector->helper_private;
696 save_encoders[count++] = connector->encoder;
697 new_encoder = connector->encoder;
698 for (ro = 0; ro < set->num_connectors; ro++) {
699 if (set->connectors[ro] == connector) {
700 new_encoder = connector_funcs->best_encoder(connector);
701 /* if we can't get an encoder for a connector
702 we are setting now - then fail */
703 if (new_encoder == NULL)
704 /* don't break so fail path works correct */
705 fail = 1;
706 break;
710 if (new_encoder != connector->encoder) {
711 mode_changed = true;
712 connector->encoder = new_encoder;
716 if (fail) {
717 ret = -EINVAL;
718 goto fail_no_encoder;
721 count = 0;
722 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
723 if (!connector->encoder)
724 continue;
726 save_crtcs[count++] = connector->encoder->crtc;
728 if (connector->encoder->crtc == set->crtc)
729 new_crtc = NULL;
730 else
731 new_crtc = connector->encoder->crtc;
733 for (ro = 0; ro < set->num_connectors; ro++) {
734 if (set->connectors[ro] == connector)
735 new_crtc = set->crtc;
737 if (new_crtc != connector->encoder->crtc) {
738 mode_changed = true;
739 connector->encoder->crtc = new_crtc;
743 /* mode_set_base is not a required function */
744 if (fb_changed && !crtc_funcs->mode_set_base)
745 mode_changed = true;
747 if (mode_changed) {
748 old_fb = set->crtc->fb;
749 set->crtc->fb = set->fb;
750 set->crtc->enabled = (set->mode != NULL);
751 if (set->mode != NULL) {
752 DRM_DEBUG("attempting to set mode from userspace\n");
753 drm_mode_debug_printmodeline(set->mode);
754 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
755 set->x, set->y,
756 old_fb)) {
757 DRM_ERROR("failed to set mode on crtc %p\n",
758 set->crtc);
759 ret = -EINVAL;
760 goto fail_set_mode;
762 /* TODO are these needed? */
763 set->crtc->desired_x = set->x;
764 set->crtc->desired_y = set->y;
765 set->crtc->desired_mode = set->mode;
767 drm_helper_disable_unused_functions(dev);
768 } else if (fb_changed) {
769 old_fb = set->crtc->fb;
770 if (set->crtc->fb != set->fb)
771 set->crtc->fb = set->fb;
772 ret = crtc_funcs->mode_set_base(set->crtc,
773 set->x, set->y, old_fb);
774 if (ret != 0)
775 goto fail_set_mode;
778 kfree(save_encoders);
779 kfree(save_crtcs);
780 return 0;
782 fail_set_mode:
783 set->crtc->enabled = save_enabled;
784 count = 0;
785 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
786 if (!connector->encoder)
787 continue;
789 connector->encoder->crtc = save_crtcs[count++];
791 fail_no_encoder:
792 kfree(save_crtcs);
793 count = 0;
794 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
795 connector->encoder = save_encoders[count++];
797 kfree(save_encoders);
798 return ret;
800 EXPORT_SYMBOL(drm_crtc_helper_set_config);
802 bool drm_helper_plugged_event(struct drm_device *dev)
804 DRM_DEBUG("\n");
806 drm_helper_probe_connector_modes(dev, dev->mode_config.max_width,
807 dev->mode_config.max_height);
809 drm_setup_crtcs(dev);
811 /* alert the driver fb layer */
812 dev->mode_config.funcs->fb_changed(dev);
814 /* FIXME: send hotplug event */
815 return true;
818 * drm_initial_config - setup a sane initial connector configuration
819 * @dev: DRM device
820 * @can_grow: this configuration is growable
822 * LOCKING:
823 * Called at init time, must take mode config lock.
825 * Scan the CRTCs and connectors and try to put together an initial setup.
826 * At the moment, this is a cloned configuration across all heads with
827 * a new framebuffer object as the backing store.
829 * RETURNS:
830 * Zero if everything went ok, nonzero otherwise.
832 bool drm_helper_initial_config(struct drm_device *dev, bool can_grow)
834 struct drm_connector *connector;
835 int count = 0;
837 count = drm_helper_probe_connector_modes(dev,
838 dev->mode_config.max_width,
839 dev->mode_config.max_height);
842 * None of the available connectors had any modes, so add some
843 * and try to light them up anyway
845 if (!count) {
846 DRM_ERROR("connectors have no modes, using standard modes\n");
847 list_for_each_entry(connector,
848 &dev->mode_config.connector_list,
849 head)
850 drm_helper_add_std_modes(dev, connector);
853 drm_setup_crtcs(dev);
855 /* alert the driver fb layer */
856 dev->mode_config.funcs->fb_changed(dev);
858 return 0;
860 EXPORT_SYMBOL(drm_helper_initial_config);
863 * drm_hotplug_stage_two
864 * @dev DRM device
865 * @connector hotpluged connector
867 * LOCKING.
868 * Caller must hold mode config lock, function might grab struct lock.
870 * Stage two of a hotplug.
872 * RETURNS:
873 * Zero on success, errno on failure.
875 int drm_helper_hotplug_stage_two(struct drm_device *dev)
877 drm_helper_plugged_event(dev);
879 return 0;
881 EXPORT_SYMBOL(drm_helper_hotplug_stage_two);
883 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
884 struct drm_mode_fb_cmd *mode_cmd)
886 fb->width = mode_cmd->width;
887 fb->height = mode_cmd->height;
888 fb->pitch = mode_cmd->pitch;
889 fb->bits_per_pixel = mode_cmd->bpp;
890 fb->depth = mode_cmd->depth;
892 return 0;
894 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
896 int drm_helper_resume_force_mode(struct drm_device *dev)
898 struct drm_crtc *crtc;
899 int ret;
901 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
903 if (!crtc->enabled)
904 continue;
906 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
907 crtc->x, crtc->y, crtc->fb);
909 if (ret == false)
910 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
912 return 0;
914 EXPORT_SYMBOL(drm_helper_resume_force_mode);