drm/radeon/kms/atom: AdjustPixelClock fixes for DP bridges
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / gpu / drm / drm_crtc_helper.c
blob92369655dca3aae197c2ed9d4e45a5d0d8b1ed36
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"
35 #include "drm_fb_helper.h"
37 static bool drm_kms_helper_poll = true;
38 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
40 static void drm_mode_validate_flag(struct drm_connector *connector,
41 int flags)
43 struct drm_display_mode *mode, *t;
45 if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
46 return;
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;
57 return;
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
66 * LOCKING:
67 * Caller must hold mode config lock.
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.
74 * Intended to be used either at bootup time or when major configuration
75 * changes have occurred.
77 * FIXME: take into account monitor limits
79 * RETURNS:
80 * Number of modes found on @connector.
82 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
83 uint32_t maxX, uint32_t maxY)
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;
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;
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);
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;
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;
123 drm_mode_connector_list_update(connector);
125 if (maxX && maxY)
126 drm_mode_validate_size(dev, &connector->modes, maxX,
127 maxY, 0);
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);
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);
141 prune:
142 drm_mode_prune_invalid(dev, &connector->modes, true);
144 if (list_empty(&connector->modes))
145 return 0;
147 drm_mode_sort(&connector->modes);
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);
154 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
155 drm_mode_debug_printmodeline(mode);
158 return count;
160 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
163 * drm_helper_encoder_in_use - check if a given encoder is in use
164 * @encoder: encoder to check
166 * LOCKING:
167 * Caller must hold mode config lock.
169 * Walk @encoders's DRM device's mode_config and see if it's in use.
171 * RETURNS:
172 * True if @encoder is part of the mode_config, false otherwise.
174 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
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;
183 EXPORT_SYMBOL(drm_helper_encoder_in_use);
186 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
187 * @crtc: CRTC to check
189 * LOCKING:
190 * Caller must hold mode config lock.
192 * Walk @crtc's DRM device's mode_config and see if it's in use.
194 * RETURNS:
195 * True if @crtc is part of the mode_config, false otherwise.
197 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
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;
207 EXPORT_SYMBOL(drm_helper_crtc_in_use);
209 static void
210 drm_encoder_disable(struct drm_encoder *encoder)
212 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
214 if (encoder_funcs->disable)
215 (*encoder_funcs->disable)(encoder);
216 else
217 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
221 * drm_helper_disable_unused_functions - disable unused objects
222 * @dev: DRM device
224 * LOCKING:
225 * Caller must hold mode config lock.
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.
230 void drm_helper_disable_unused_functions(struct drm_device *dev)
232 struct drm_encoder *encoder;
233 struct drm_connector *connector;
234 struct drm_crtc *crtc;
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;
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;
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;
263 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
266 * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
267 * @encoder: encoder to test
268 * @crtc: crtc to test
270 * Return false if @encoder can't be driven by @crtc, true otherwise.
272 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
273 struct drm_crtc *crtc)
275 struct drm_device *dev;
276 struct drm_crtc *tmp;
277 int crtc_mask = 1;
279 WARN(!crtc, "checking null crtc?\n");
281 dev = crtc->dev;
283 list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
284 if (tmp == crtc)
285 break;
286 crtc_mask <<= 1;
289 if (encoder->possible_crtcs & crtc_mask)
290 return true;
291 return false;
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.
299 static void
300 drm_crtc_prepare_encoders(struct drm_device *dev)
302 struct drm_encoder_helper_funcs *encoder_funcs;
303 struct drm_encoder *encoder;
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);
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
324 * LOCKING:
325 * Caller must hold mode config lock.
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.
330 * RETURNS:
331 * True if the mode was set successfully, or false otherwise.
333 bool 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)
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;
346 crtc->enabled = drm_helper_crtc_in_use(crtc);
347 if (!crtc->enabled)
348 return true;
350 adjusted_mode = drm_mode_duplicate(dev, mode);
352 saved_hwmode = crtc->hwmode;
353 saved_mode = crtc->mode;
354 saved_x = crtc->x;
355 saved_y = crtc->y;
357 /* Update crtc values up front so the driver can rely on them for mode
358 * setting.
360 crtc->mode = *mode;
361 crtc->x = x;
362 crtc->y = y;
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.
368 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
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;
379 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
380 goto done;
382 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
384 /* Prepare the encoders and CRTCs before setting the mode. */
385 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
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);
394 drm_crtc_prepare_encoders(dev);
396 crtc_funcs->prepare(crtc);
398 /* Set up the DPLL and any encoders state that needs to adjust or depend
399 * on the DPLL.
401 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
402 if (!ret)
403 goto done;
405 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
407 if (encoder->crtc != crtc)
408 continue;
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);
417 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
418 crtc_funcs->commit(crtc);
420 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
422 if (encoder->crtc != crtc)
423 continue;
425 encoder_funcs = encoder->helper_private;
426 encoder_funcs->commit(encoder);
430 /* Store real post-adjustment hardware mode. */
431 crtc->hwmode = *adjusted_mode;
433 /* Calculate and store various constants which
434 * are later needed by vblank and swap-completion
435 * timestamping. They are derived from true hwmode.
437 drm_calc_timestamping_constants(crtc);
439 /* FIXME: add subpixel order */
440 done:
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;
449 return ret;
451 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
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
462 * LOCKING:
463 * Caller must hold mode config lock.
465 * Setup a new configuration, provided by the user in @crtc_info, and enable
466 * it.
468 * RETURNS:
469 * Zero. (FIXME)
471 int drm_crtc_helper_set_config(struct drm_mode_set *set)
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;
485 DRM_DEBUG_KMS("\n");
487 if (!set)
488 return -EINVAL;
490 if (!set->crtc)
491 return -EINVAL;
493 if (!set->crtc->helper_private)
494 return -EINVAL;
496 crtc_funcs = set->crtc->helper_private;
498 if (!set->mode)
499 set->fb = NULL;
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;
511 dev = set->crtc->dev;
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;
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;
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;
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.
539 count = 0;
540 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
541 save_crtcs[count++] = *crtc;
544 count = 0;
545 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
546 save_encoders[count++] = *encoder;
549 count = 0;
550 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
551 save_connectors[count++] = *connector;
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
564 fb_changed = true;
567 if (set->x != set->crtc->x || set->y != set->crtc->y)
568 fb_changed = true;
570 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
571 DRM_DEBUG_KMS("modes are different, full mode set\n");
572 drm_mode_debug_printmodeline(&set->crtc->mode);
573 drm_mode_debug_printmodeline(set->mode);
574 mode_changed = true;
577 /* a) traverse passed in connector list and get encoders for them */
578 count = 0;
579 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
580 struct drm_connector_helper_funcs *connector_funcs =
581 connector->helper_private;
582 new_encoder = connector->encoder;
583 for (ro = 0; ro < set->num_connectors; ro++) {
584 if (set->connectors[ro] == connector) {
585 new_encoder = connector_funcs->best_encoder(connector);
586 /* if we can't get an encoder for a connector
587 we are setting now - then fail */
588 if (new_encoder == NULL)
589 /* don't break so fail path works correct */
590 fail = 1;
591 break;
595 if (new_encoder != connector->encoder) {
596 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
597 mode_changed = true;
598 /* If the encoder is reused for another connector, then
599 * the appropriate crtc will be set later.
601 if (connector->encoder)
602 connector->encoder->crtc = NULL;
603 connector->encoder = new_encoder;
607 if (fail) {
608 ret = -EINVAL;
609 goto fail;
612 count = 0;
613 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
614 if (!connector->encoder)
615 continue;
617 if (connector->encoder->crtc == set->crtc)
618 new_crtc = NULL;
619 else
620 new_crtc = connector->encoder->crtc;
622 for (ro = 0; ro < set->num_connectors; ro++) {
623 if (set->connectors[ro] == connector)
624 new_crtc = set->crtc;
627 /* Make sure the new CRTC will work with the encoder */
628 if (new_crtc &&
629 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
630 ret = -EINVAL;
631 goto fail;
633 if (new_crtc != connector->encoder->crtc) {
634 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
635 mode_changed = true;
636 connector->encoder->crtc = new_crtc;
638 if (new_crtc) {
639 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
640 connector->base.id, drm_get_connector_name(connector),
641 new_crtc->base.id);
642 } else {
643 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
644 connector->base.id, drm_get_connector_name(connector));
648 /* mode_set_base is not a required function */
649 if (fb_changed && !crtc_funcs->mode_set_base)
650 mode_changed = true;
652 if (mode_changed) {
653 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
654 if (set->crtc->enabled) {
655 DRM_DEBUG_KMS("attempting to set mode from"
656 " userspace\n");
657 drm_mode_debug_printmodeline(set->mode);
658 old_fb = set->crtc->fb;
659 set->crtc->fb = set->fb;
660 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
661 set->x, set->y,
662 old_fb)) {
663 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
664 set->crtc->base.id);
665 set->crtc->fb = old_fb;
666 ret = -EINVAL;
667 goto fail;
669 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
670 for (i = 0; i < set->num_connectors; i++) {
671 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
672 drm_get_connector_name(set->connectors[i]));
673 set->connectors[i]->dpms = DRM_MODE_DPMS_ON;
676 drm_helper_disable_unused_functions(dev);
677 } else if (fb_changed) {
678 set->crtc->x = set->x;
679 set->crtc->y = set->y;
681 old_fb = set->crtc->fb;
682 if (set->crtc->fb != set->fb)
683 set->crtc->fb = set->fb;
684 ret = crtc_funcs->mode_set_base(set->crtc,
685 set->x, set->y, old_fb);
686 if (ret != 0) {
687 set->crtc->fb = old_fb;
688 goto fail;
692 kfree(save_connectors);
693 kfree(save_encoders);
694 kfree(save_crtcs);
695 return 0;
697 fail:
698 /* Restore all previous data. */
699 count = 0;
700 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
701 *crtc = save_crtcs[count++];
704 count = 0;
705 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
706 *encoder = save_encoders[count++];
709 count = 0;
710 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
711 *connector = save_connectors[count++];
714 kfree(save_connectors);
715 kfree(save_encoders);
716 kfree(save_crtcs);
717 return ret;
719 EXPORT_SYMBOL(drm_crtc_helper_set_config);
721 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
723 int dpms = DRM_MODE_DPMS_OFF;
724 struct drm_connector *connector;
725 struct drm_device *dev = encoder->dev;
727 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
728 if (connector->encoder == encoder)
729 if (connector->dpms < dpms)
730 dpms = connector->dpms;
731 return dpms;
734 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
736 int dpms = DRM_MODE_DPMS_OFF;
737 struct drm_connector *connector;
738 struct drm_device *dev = crtc->dev;
740 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
741 if (connector->encoder && connector->encoder->crtc == crtc)
742 if (connector->dpms < dpms)
743 dpms = connector->dpms;
744 return dpms;
748 * drm_helper_connector_dpms
749 * @connector affected connector
750 * @mode DPMS mode
752 * Calls the low-level connector DPMS function, then
753 * calls appropriate encoder and crtc DPMS functions as well
755 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
757 struct drm_encoder *encoder = connector->encoder;
758 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
759 int old_dpms;
761 if (mode == connector->dpms)
762 return;
764 old_dpms = connector->dpms;
765 connector->dpms = mode;
767 /* from off to on, do crtc then encoder */
768 if (mode < old_dpms) {
769 if (crtc) {
770 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
771 if (crtc_funcs->dpms)
772 (*crtc_funcs->dpms) (crtc,
773 drm_helper_choose_crtc_dpms(crtc));
775 if (encoder) {
776 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
777 if (encoder_funcs->dpms)
778 (*encoder_funcs->dpms) (encoder,
779 drm_helper_choose_encoder_dpms(encoder));
783 /* from on to off, do encoder then crtc */
784 if (mode > old_dpms) {
785 if (encoder) {
786 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
787 if (encoder_funcs->dpms)
788 (*encoder_funcs->dpms) (encoder,
789 drm_helper_choose_encoder_dpms(encoder));
791 if (crtc) {
792 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
793 if (crtc_funcs->dpms)
794 (*crtc_funcs->dpms) (crtc,
795 drm_helper_choose_crtc_dpms(crtc));
799 return;
801 EXPORT_SYMBOL(drm_helper_connector_dpms);
803 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
804 struct drm_mode_fb_cmd *mode_cmd)
806 fb->width = mode_cmd->width;
807 fb->height = mode_cmd->height;
808 fb->pitch = mode_cmd->pitch;
809 fb->bits_per_pixel = mode_cmd->bpp;
810 fb->depth = mode_cmd->depth;
812 return 0;
814 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
816 int drm_helper_resume_force_mode(struct drm_device *dev)
818 struct drm_crtc *crtc;
819 struct drm_encoder *encoder;
820 struct drm_encoder_helper_funcs *encoder_funcs;
821 struct drm_crtc_helper_funcs *crtc_funcs;
822 int ret;
824 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
826 if (!crtc->enabled)
827 continue;
829 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
830 crtc->x, crtc->y, crtc->fb);
832 if (ret == false)
833 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
835 /* Turn off outputs that were already powered off */
836 if (drm_helper_choose_crtc_dpms(crtc)) {
837 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
839 if(encoder->crtc != crtc)
840 continue;
842 encoder_funcs = encoder->helper_private;
843 if (encoder_funcs->dpms)
844 (*encoder_funcs->dpms) (encoder,
845 drm_helper_choose_encoder_dpms(encoder));
848 crtc_funcs = crtc->helper_private;
849 if (crtc_funcs->dpms)
850 (*crtc_funcs->dpms) (crtc,
851 drm_helper_choose_crtc_dpms(crtc));
854 /* disable the unused connectors while restoring the modesetting */
855 drm_helper_disable_unused_functions(dev);
856 return 0;
858 EXPORT_SYMBOL(drm_helper_resume_force_mode);
860 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
861 static void output_poll_execute(struct work_struct *work)
863 struct delayed_work *delayed_work = to_delayed_work(work);
864 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
865 struct drm_connector *connector;
866 enum drm_connector_status old_status;
867 bool repoll = false, changed = false;
869 if (!drm_kms_helper_poll)
870 return;
872 mutex_lock(&dev->mode_config.mutex);
873 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
875 /* if this is HPD or polled don't check it -
876 TV out for instance */
877 if (!connector->polled)
878 continue;
880 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
881 repoll = true;
883 old_status = connector->status;
884 /* if we are connected and don't want to poll for disconnect
885 skip it */
886 if (old_status == connector_status_connected &&
887 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
888 !(connector->polled & DRM_CONNECTOR_POLL_HPD))
889 continue;
891 connector->status = connector->funcs->detect(connector, false);
892 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
893 connector->base.id,
894 drm_get_connector_name(connector),
895 old_status, connector->status);
896 if (old_status != connector->status)
897 changed = true;
900 mutex_unlock(&dev->mode_config.mutex);
902 if (changed) {
903 /* send a uevent + call fbdev */
904 drm_sysfs_hotplug_event(dev);
905 if (dev->mode_config.funcs->output_poll_changed)
906 dev->mode_config.funcs->output_poll_changed(dev);
909 if (repoll)
910 queue_delayed_work(system_nrt_wq, delayed_work, DRM_OUTPUT_POLL_PERIOD);
913 void drm_kms_helper_poll_disable(struct drm_device *dev)
915 if (!dev->mode_config.poll_enabled)
916 return;
917 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
919 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
921 void drm_kms_helper_poll_enable(struct drm_device *dev)
923 bool poll = false;
924 struct drm_connector *connector;
926 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
927 return;
929 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
930 if (connector->polled)
931 poll = true;
934 if (poll)
935 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
937 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
939 void drm_kms_helper_poll_init(struct drm_device *dev)
941 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
942 dev->mode_config.poll_enabled = true;
944 drm_kms_helper_poll_enable(dev);
946 EXPORT_SYMBOL(drm_kms_helper_poll_init);
948 void drm_kms_helper_poll_fini(struct drm_device *dev)
950 drm_kms_helper_poll_disable(dev);
952 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
954 void drm_helper_hpd_irq_event(struct drm_device *dev)
956 if (!dev->mode_config.poll_enabled)
957 return;
959 /* kill timer and schedule immediate execution, this doesn't block */
960 cancel_delayed_work(&dev->mode_config.output_poll_work);
961 if (drm_kms_helper_poll)
962 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, 0);
964 EXPORT_SYMBOL(drm_helper_hpd_irq_event);