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
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
32 #include <linux/export.h>
33 #include <linux/moduleparam.h>
36 #include <drm/drm_crtc.h>
37 #include <drm/drm_fourcc.h>
38 #include <drm/drm_crtc_helper.h>
39 #include <drm/drm_fb_helper.h>
40 #include <drm/drm_edid.h>
43 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
45 * @dev: drm device to operate on
47 * Some userspace presumes that the first connected connector is the main
48 * display, where it's supposed to display e.g. the login screen. For
49 * laptops, this should be the main panel. Use this function to sort all
50 * (eDP/LVDS) panels to the front of the connector list, instead of
51 * painstakingly trying to initialize them in the right order.
53 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
55 struct drm_connector *connector, *tmp;
56 struct list_head panel_list;
58 INIT_LIST_HEAD(&panel_list);
60 list_for_each_entry_safe(connector, tmp,
61 &dev->mode_config.connector_list, head) {
62 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
63 connector->connector_type == DRM_MODE_CONNECTOR_eDP)
64 list_move_tail(&connector->head, &panel_list);
67 list_splice(&panel_list, &dev->mode_config.connector_list);
69 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
71 static bool drm_kms_helper_poll = true;
72 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
74 static void drm_mode_validate_flag(struct drm_connector *connector,
77 struct drm_display_mode *mode;
79 if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
82 list_for_each_entry(mode, &connector->modes, head) {
83 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
84 !(flags & DRM_MODE_FLAG_INTERLACE))
85 mode->status = MODE_NO_INTERLACE;
86 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
87 !(flags & DRM_MODE_FLAG_DBLSCAN))
88 mode->status = MODE_NO_DBLESCAN;
95 * drm_helper_probe_single_connector_modes - get complete set of display modes
96 * @connector: connector to probe
97 * @maxX: max width for modes
98 * @maxY: max height for modes
101 * Caller must hold mode config lock.
103 * Based on the helper callbacks implemented by @connector try to detect all
104 * valid modes. Modes will first be added to the connector's probed_modes list,
105 * then culled (based on validity and the @maxX, @maxY parameters) and put into
106 * the normal modes list.
108 * Intended to be use as a generic implementation of the ->probe() @connector
109 * callback for drivers that use the crtc helpers for output mode filtering and
113 * Number of modes found on @connector.
115 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
116 uint32_t maxX, uint32_t maxY)
118 struct drm_device *dev = connector->dev;
119 struct drm_display_mode *mode;
120 struct drm_connector_helper_funcs *connector_funcs =
121 connector->helper_private;
124 bool verbose_prune = true;
126 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
127 drm_get_connector_name(connector));
128 /* set all modes to the unverified state */
129 list_for_each_entry(mode, &connector->modes, head)
130 mode->status = MODE_UNVERIFIED;
132 if (connector->force) {
133 if (connector->force == DRM_FORCE_ON)
134 connector->status = connector_status_connected;
136 connector->status = connector_status_disconnected;
137 if (connector->funcs->force)
138 connector->funcs->force(connector);
140 connector->status = connector->funcs->detect(connector, true);
143 /* Re-enable polling in case the global poll config changed. */
144 if (drm_kms_helper_poll != dev->mode_config.poll_running)
145 drm_kms_helper_poll_enable(dev);
147 dev->mode_config.poll_running = drm_kms_helper_poll;
149 if (connector->status == connector_status_disconnected) {
150 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
151 connector->base.id, drm_get_connector_name(connector));
152 drm_mode_connector_update_edid_property(connector, NULL);
153 verbose_prune = false;
157 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
158 count = drm_load_edid_firmware(connector);
161 count = (*connector_funcs->get_modes)(connector);
163 if (count == 0 && connector->status == connector_status_connected)
164 count = drm_add_modes_noedid(connector, 1024, 768);
168 drm_mode_connector_list_update(connector);
171 drm_mode_validate_size(dev, &connector->modes, maxX,
174 if (connector->interlace_allowed)
175 mode_flags |= DRM_MODE_FLAG_INTERLACE;
176 if (connector->doublescan_allowed)
177 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
178 drm_mode_validate_flag(connector, mode_flags);
180 list_for_each_entry(mode, &connector->modes, head) {
181 if (mode->status == MODE_OK)
182 mode->status = connector_funcs->mode_valid(connector,
187 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
189 if (list_empty(&connector->modes))
192 list_for_each_entry(mode, &connector->modes, head)
193 mode->vrefresh = drm_mode_vrefresh(mode);
195 drm_mode_sort(&connector->modes);
197 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
198 drm_get_connector_name(connector));
199 list_for_each_entry(mode, &connector->modes, head) {
200 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
201 drm_mode_debug_printmodeline(mode);
206 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
209 * drm_helper_encoder_in_use - check if a given encoder is in use
210 * @encoder: encoder to check
213 * Caller must hold mode config lock.
215 * Walk @encoders's DRM device's mode_config and see if it's in use.
218 * True if @encoder is part of the mode_config, false otherwise.
220 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
222 struct drm_connector *connector;
223 struct drm_device *dev = encoder->dev;
224 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
225 if (connector->encoder == encoder)
229 EXPORT_SYMBOL(drm_helper_encoder_in_use);
232 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
233 * @crtc: CRTC to check
236 * Caller must hold mode config lock.
238 * Walk @crtc's DRM device's mode_config and see if it's in use.
241 * True if @crtc is part of the mode_config, false otherwise.
243 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
245 struct drm_encoder *encoder;
246 struct drm_device *dev = crtc->dev;
247 /* FIXME: Locking around list access? */
248 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
249 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
253 EXPORT_SYMBOL(drm_helper_crtc_in_use);
256 drm_encoder_disable(struct drm_encoder *encoder)
258 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
260 if (encoder_funcs->disable)
261 (*encoder_funcs->disable)(encoder);
263 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
267 * drm_helper_disable_unused_functions - disable unused objects
271 * Caller must hold mode config lock.
273 * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
274 * by calling its dpms function, which should power it off.
276 void drm_helper_disable_unused_functions(struct drm_device *dev)
278 struct drm_encoder *encoder;
279 struct drm_connector *connector;
280 struct drm_crtc *crtc;
282 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
283 if (!connector->encoder)
285 if (connector->status == connector_status_disconnected)
286 connector->encoder = NULL;
289 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
290 if (!drm_helper_encoder_in_use(encoder)) {
291 drm_encoder_disable(encoder);
292 /* disconnector encoder from any connector */
293 encoder->crtc = NULL;
297 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
298 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
299 crtc->enabled = drm_helper_crtc_in_use(crtc);
300 if (!crtc->enabled) {
301 if (crtc_funcs->disable)
302 (*crtc_funcs->disable)(crtc);
304 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
309 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
312 * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
313 * @encoder: encoder to test
314 * @crtc: crtc to test
316 * Return false if @encoder can't be driven by @crtc, true otherwise.
318 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
319 struct drm_crtc *crtc)
321 struct drm_device *dev;
322 struct drm_crtc *tmp;
325 WARN(!crtc, "checking null crtc?\n");
329 list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
335 if (encoder->possible_crtcs & crtc_mask)
341 * Check the CRTC we're going to map each output to vs. its current
342 * CRTC. If they don't match, we have to disable the output and the CRTC
343 * since the driver will have to re-route things.
346 drm_crtc_prepare_encoders(struct drm_device *dev)
348 struct drm_encoder_helper_funcs *encoder_funcs;
349 struct drm_encoder *encoder;
351 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
352 encoder_funcs = encoder->helper_private;
353 /* Disable unused encoders */
354 if (encoder->crtc == NULL)
355 drm_encoder_disable(encoder);
356 /* Disable encoders whose CRTC is about to change */
357 if (encoder_funcs->get_crtc &&
358 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
359 drm_encoder_disable(encoder);
364 * drm_crtc_helper_set_mode - internal helper to set a mode
365 * @crtc: CRTC to program
367 * @x: horizontal offset into the surface
368 * @y: vertical offset into the surface
369 * @old_fb: old framebuffer, for cleanup
372 * Caller must hold mode config lock.
374 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
375 * to fixup or reject the mode prior to trying to set it. This is an internal
376 * helper that drivers could e.g. use to update properties that require the
377 * entire output pipe to be disabled and re-enabled in a new configuration. For
378 * example for changing whether audio is enabled on a hdmi link or for changing
379 * panel fitter or dither attributes. It is also called by the
380 * drm_crtc_helper_set_config() helper function to drive the mode setting
384 * True if the mode was set successfully, or false otherwise.
386 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
387 struct drm_display_mode *mode,
389 struct drm_framebuffer *old_fb)
391 struct drm_device *dev = crtc->dev;
392 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
393 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
394 struct drm_encoder_helper_funcs *encoder_funcs;
395 int saved_x, saved_y;
396 struct drm_encoder *encoder;
399 crtc->enabled = drm_helper_crtc_in_use(crtc);
403 adjusted_mode = drm_mode_duplicate(dev, mode);
407 saved_hwmode = crtc->hwmode;
408 saved_mode = crtc->mode;
412 /* Update crtc values up front so the driver can rely on them for mode
419 /* Pass our mode to the connectors and the CRTC to give them a chance to
420 * adjust it according to limitations or connector properties, and also
421 * a chance to reject the mode entirely.
423 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
425 if (encoder->crtc != crtc)
427 encoder_funcs = encoder->helper_private;
428 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
430 DRM_DEBUG_KMS("Encoder fixup failed\n");
435 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
436 DRM_DEBUG_KMS("CRTC fixup failed\n");
439 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
441 /* Prepare the encoders and CRTCs before setting the mode. */
442 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
444 if (encoder->crtc != crtc)
446 encoder_funcs = encoder->helper_private;
447 /* Disable the encoders as the first thing we do. */
448 encoder_funcs->prepare(encoder);
451 drm_crtc_prepare_encoders(dev);
453 crtc_funcs->prepare(crtc);
455 /* Set up the DPLL and any encoders state that needs to adjust or depend
458 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
462 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
464 if (encoder->crtc != crtc)
467 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
468 encoder->base.id, drm_get_encoder_name(encoder),
469 mode->base.id, mode->name);
470 encoder_funcs = encoder->helper_private;
471 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
474 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
475 crtc_funcs->commit(crtc);
477 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
479 if (encoder->crtc != crtc)
482 encoder_funcs = encoder->helper_private;
483 encoder_funcs->commit(encoder);
487 /* Store real post-adjustment hardware mode. */
488 crtc->hwmode = *adjusted_mode;
490 /* Calculate and store various constants which
491 * are later needed by vblank and swap-completion
492 * timestamping. They are derived from true hwmode.
494 drm_calc_timestamping_constants(crtc);
496 /* FIXME: add subpixel order */
498 drm_mode_destroy(dev, adjusted_mode);
500 crtc->hwmode = saved_hwmode;
501 crtc->mode = saved_mode;
508 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
512 drm_crtc_helper_disable(struct drm_crtc *crtc)
514 struct drm_device *dev = crtc->dev;
515 struct drm_connector *connector;
516 struct drm_encoder *encoder;
518 /* Decouple all encoders and their attached connectors from this crtc */
519 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
520 if (encoder->crtc != crtc)
523 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
524 if (connector->encoder != encoder)
527 connector->encoder = NULL;
531 drm_helper_disable_unused_functions(dev);
536 * drm_crtc_helper_set_config - set a new config from userspace
537 * @set: mode set configuration
540 * Caller must hold mode config lock.
542 * Setup a new configuration, provided by the upper layers (either an ioctl call
543 * from userspace or internally e.g. from the fbdev suppport code) in @set, and
544 * enable it. This is the main helper functions for drivers that implement
545 * kernel mode setting with the crtc helper functions and the assorted
546 * ->prepare(), ->modeset() and ->commit() helper callbacks.
549 * Returns 0 on success, -ERRNO on failure.
551 int drm_crtc_helper_set_config(struct drm_mode_set *set)
553 struct drm_device *dev;
554 struct drm_crtc *save_crtcs, *new_crtc, *crtc;
555 struct drm_encoder *save_encoders, *new_encoder, *encoder;
556 struct drm_framebuffer *old_fb = NULL;
557 bool mode_changed = false; /* if true do a full mode set */
558 bool fb_changed = false; /* if true and !mode_changed just do a flip */
559 struct drm_connector *save_connectors, *connector;
560 int count = 0, ro, fail = 0;
561 struct drm_crtc_helper_funcs *crtc_funcs;
562 struct drm_mode_set save_set;
570 BUG_ON(!set->crtc->helper_private);
572 /* Enforce sane interface api - has been abused by the fb helper. */
573 BUG_ON(!set->mode && set->fb);
574 BUG_ON(set->fb && set->num_connectors == 0);
576 crtc_funcs = set->crtc->helper_private;
582 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
583 set->crtc->base.id, set->fb->base.id,
584 (int)set->num_connectors, set->x, set->y);
586 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
587 return drm_crtc_helper_disable(set->crtc);
590 dev = set->crtc->dev;
592 /* Allocate space for the backup of all (non-pointer) crtc, encoder and
594 save_crtcs = kzalloc(dev->mode_config.num_crtc *
595 sizeof(struct drm_crtc), GFP_KERNEL);
599 save_encoders = kzalloc(dev->mode_config.num_encoder *
600 sizeof(struct drm_encoder), GFP_KERNEL);
601 if (!save_encoders) {
606 save_connectors = kzalloc(dev->mode_config.num_connector *
607 sizeof(struct drm_connector), GFP_KERNEL);
608 if (!save_connectors) {
610 kfree(save_encoders);
614 /* Copy data. Note that driver private data is not affected.
615 * Should anything bad happen only the expected state is
616 * restored, not the drivers personal bookkeeping.
619 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
620 save_crtcs[count++] = *crtc;
624 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
625 save_encoders[count++] = *encoder;
629 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
630 save_connectors[count++] = *connector;
633 save_set.crtc = set->crtc;
634 save_set.mode = &set->crtc->mode;
635 save_set.x = set->crtc->x;
636 save_set.y = set->crtc->y;
637 save_set.fb = set->crtc->fb;
639 /* We should be able to check here if the fb has the same properties
640 * and then just flip_or_move it */
641 if (set->crtc->fb != set->fb) {
642 /* If we have no fb then treat it as a full mode set */
643 if (set->crtc->fb == NULL) {
644 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
646 } else if (set->fb == NULL) {
648 } else if (set->fb->pixel_format !=
649 set->crtc->fb->pixel_format) {
655 if (set->x != set->crtc->x || set->y != set->crtc->y)
658 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
659 DRM_DEBUG_KMS("modes are different, full mode set\n");
660 drm_mode_debug_printmodeline(&set->crtc->mode);
661 drm_mode_debug_printmodeline(set->mode);
665 /* a) traverse passed in connector list and get encoders for them */
667 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
668 struct drm_connector_helper_funcs *connector_funcs =
669 connector->helper_private;
670 new_encoder = connector->encoder;
671 for (ro = 0; ro < set->num_connectors; ro++) {
672 if (set->connectors[ro] == connector) {
673 new_encoder = connector_funcs->best_encoder(connector);
674 /* if we can't get an encoder for a connector
675 we are setting now - then fail */
676 if (new_encoder == NULL)
677 /* don't break so fail path works correct */
683 if (new_encoder != connector->encoder) {
684 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
686 /* If the encoder is reused for another connector, then
687 * the appropriate crtc will be set later.
689 if (connector->encoder)
690 connector->encoder->crtc = NULL;
691 connector->encoder = new_encoder;
701 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
702 if (!connector->encoder)
705 if (connector->encoder->crtc == set->crtc)
708 new_crtc = connector->encoder->crtc;
710 for (ro = 0; ro < set->num_connectors; ro++) {
711 if (set->connectors[ro] == connector)
712 new_crtc = set->crtc;
715 /* Make sure the new CRTC will work with the encoder */
717 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
721 if (new_crtc != connector->encoder->crtc) {
722 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
724 connector->encoder->crtc = new_crtc;
727 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
728 connector->base.id, drm_get_connector_name(connector),
731 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
732 connector->base.id, drm_get_connector_name(connector));
736 /* mode_set_base is not a required function */
737 if (fb_changed && !crtc_funcs->mode_set_base)
741 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
742 if (set->crtc->enabled) {
743 DRM_DEBUG_KMS("attempting to set mode from"
745 drm_mode_debug_printmodeline(set->mode);
746 old_fb = set->crtc->fb;
747 set->crtc->fb = set->fb;
748 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
751 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
753 set->crtc->fb = old_fb;
758 drm_helper_disable_unused_functions(dev);
759 } else if (fb_changed) {
760 set->crtc->x = set->x;
761 set->crtc->y = set->y;
763 old_fb = set->crtc->fb;
764 if (set->crtc->fb != set->fb)
765 set->crtc->fb = set->fb;
766 ret = crtc_funcs->mode_set_base(set->crtc,
767 set->x, set->y, old_fb);
769 set->crtc->fb = old_fb;
775 * crtc set_config helpers implicit set the crtc and all connected
776 * encoders to DPMS on for a full mode set. But for just an fb update it
777 * doesn't do that. To not confuse userspace, do an explicit DPMS_ON
778 * unconditionally. This will also ensure driver internal dpms state is
781 if (set->crtc->enabled) {
782 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
783 for (i = 0; i < set->num_connectors; i++) {
784 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
785 drm_get_connector_name(set->connectors[i]));
786 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
790 kfree(save_connectors);
791 kfree(save_encoders);
796 /* Restore all previous data. */
798 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
799 *crtc = save_crtcs[count++];
803 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
804 *encoder = save_encoders[count++];
808 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
809 *connector = save_connectors[count++];
812 /* Try to restore the config */
814 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
815 save_set.y, save_set.fb))
816 DRM_ERROR("failed to restore config after modeset failure\n");
818 kfree(save_connectors);
819 kfree(save_encoders);
823 EXPORT_SYMBOL(drm_crtc_helper_set_config);
825 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
827 int dpms = DRM_MODE_DPMS_OFF;
828 struct drm_connector *connector;
829 struct drm_device *dev = encoder->dev;
831 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
832 if (connector->encoder == encoder)
833 if (connector->dpms < dpms)
834 dpms = connector->dpms;
838 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
840 int dpms = DRM_MODE_DPMS_OFF;
841 struct drm_connector *connector;
842 struct drm_device *dev = crtc->dev;
844 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
845 if (connector->encoder && connector->encoder->crtc == crtc)
846 if (connector->dpms < dpms)
847 dpms = connector->dpms;
852 * drm_helper_connector_dpms() - connector dpms helper implementation
853 * @connector: affected connector
856 * This is the main helper function provided by the crtc helper framework for
857 * implementing the DPMS connector attribute. It computes the new desired DPMS
858 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
859 * callback provided by the driver appropriately.
861 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
863 struct drm_encoder *encoder = connector->encoder;
864 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
867 if (mode == connector->dpms)
870 old_dpms = connector->dpms;
871 connector->dpms = mode;
873 /* from off to on, do crtc then encoder */
874 if (mode < old_dpms) {
876 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
877 if (crtc_funcs->dpms)
878 (*crtc_funcs->dpms) (crtc,
879 drm_helper_choose_crtc_dpms(crtc));
882 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
883 if (encoder_funcs->dpms)
884 (*encoder_funcs->dpms) (encoder,
885 drm_helper_choose_encoder_dpms(encoder));
889 /* from on to off, do encoder then crtc */
890 if (mode > old_dpms) {
892 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
893 if (encoder_funcs->dpms)
894 (*encoder_funcs->dpms) (encoder,
895 drm_helper_choose_encoder_dpms(encoder));
898 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
899 if (crtc_funcs->dpms)
900 (*crtc_funcs->dpms) (crtc,
901 drm_helper_choose_crtc_dpms(crtc));
907 EXPORT_SYMBOL(drm_helper_connector_dpms);
909 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
910 struct drm_mode_fb_cmd2 *mode_cmd)
914 fb->width = mode_cmd->width;
915 fb->height = mode_cmd->height;
916 for (i = 0; i < 4; i++) {
917 fb->pitches[i] = mode_cmd->pitches[i];
918 fb->offsets[i] = mode_cmd->offsets[i];
920 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
921 &fb->bits_per_pixel);
922 fb->pixel_format = mode_cmd->pixel_format;
926 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
928 int drm_helper_resume_force_mode(struct drm_device *dev)
930 struct drm_crtc *crtc;
931 struct drm_encoder *encoder;
932 struct drm_encoder_helper_funcs *encoder_funcs;
933 struct drm_crtc_helper_funcs *crtc_funcs;
936 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
941 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
942 crtc->x, crtc->y, crtc->fb);
945 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
947 /* Turn off outputs that were already powered off */
948 if (drm_helper_choose_crtc_dpms(crtc)) {
949 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
951 if(encoder->crtc != crtc)
954 encoder_funcs = encoder->helper_private;
955 if (encoder_funcs->dpms)
956 (*encoder_funcs->dpms) (encoder,
957 drm_helper_choose_encoder_dpms(encoder));
960 crtc_funcs = crtc->helper_private;
961 if (crtc_funcs->dpms)
962 (*crtc_funcs->dpms) (crtc,
963 drm_helper_choose_crtc_dpms(crtc));
966 /* disable the unused connectors while restoring the modesetting */
967 drm_helper_disable_unused_functions(dev);
970 EXPORT_SYMBOL(drm_helper_resume_force_mode);
972 void drm_kms_helper_hotplug_event(struct drm_device *dev)
974 /* send a uevent + call fbdev */
975 drm_sysfs_hotplug_event(dev);
976 if (dev->mode_config.funcs->output_poll_changed)
977 dev->mode_config.funcs->output_poll_changed(dev);
979 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
981 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
982 static void output_poll_execute(struct work_struct *work)
984 struct delayed_work *delayed_work = to_delayed_work(work);
985 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
986 struct drm_connector *connector;
987 enum drm_connector_status old_status;
988 bool repoll = false, changed = false;
990 if (!drm_kms_helper_poll)
993 mutex_lock(&dev->mode_config.mutex);
994 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
996 /* Ignore forced connectors. */
997 if (connector->force)
1000 /* Ignore HPD capable connectors and connectors where we don't
1001 * want any hotplug detection at all for polling. */
1002 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
1007 old_status = connector->status;
1008 /* if we are connected and don't want to poll for disconnect
1010 if (old_status == connector_status_connected &&
1011 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1014 connector->status = connector->funcs->detect(connector, false);
1015 if (old_status != connector->status) {
1016 const char *old, *new;
1018 old = drm_get_connector_status_name(old_status);
1019 new = drm_get_connector_status_name(connector->status);
1021 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1022 "status updated from %s to %s\n",
1024 drm_get_connector_name(connector),
1031 mutex_unlock(&dev->mode_config.mutex);
1034 drm_kms_helper_hotplug_event(dev);
1037 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1040 void drm_kms_helper_poll_disable(struct drm_device *dev)
1042 if (!dev->mode_config.poll_enabled)
1044 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1046 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1048 void drm_kms_helper_poll_enable(struct drm_device *dev)
1051 struct drm_connector *connector;
1053 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1056 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1057 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1058 DRM_CONNECTOR_POLL_DISCONNECT))
1063 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1065 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1067 void drm_kms_helper_poll_init(struct drm_device *dev)
1069 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1070 dev->mode_config.poll_enabled = true;
1072 drm_kms_helper_poll_enable(dev);
1074 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1076 void drm_kms_helper_poll_fini(struct drm_device *dev)
1078 drm_kms_helper_poll_disable(dev);
1080 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1082 void drm_helper_hpd_irq_event(struct drm_device *dev)
1084 struct drm_connector *connector;
1085 enum drm_connector_status old_status;
1086 bool changed = false;
1088 if (!dev->mode_config.poll_enabled)
1091 mutex_lock(&dev->mode_config.mutex);
1092 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1094 /* Only handle HPD capable connectors. */
1095 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1098 old_status = connector->status;
1100 connector->status = connector->funcs->detect(connector, false);
1101 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1103 drm_get_connector_name(connector),
1104 drm_get_connector_status_name(old_status),
1105 drm_get_connector_status_name(connector->status));
1106 if (old_status != connector->status)
1110 mutex_unlock(&dev->mode_config.mutex);
1113 drm_kms_helper_hotplug_event(dev);
1115 EXPORT_SYMBOL(drm_helper_hpd_irq_event);