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>
42 MODULE_AUTHOR("David Airlie, Jesse Barnes");
43 MODULE_DESCRIPTION("DRM KMS helper");
44 MODULE_LICENSE("GPL and additional rights");
47 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
49 * @dev: drm device to operate on
51 * Some userspace presumes that the first connected connector is the main
52 * display, where it's supposed to display e.g. the login screen. For
53 * laptops, this should be the main panel. Use this function to sort all
54 * (eDP/LVDS) panels to the front of the connector list, instead of
55 * painstakingly trying to initialize them in the right order.
57 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
59 struct drm_connector *connector, *tmp;
60 struct list_head panel_list;
62 INIT_LIST_HEAD(&panel_list);
64 list_for_each_entry_safe(connector, tmp,
65 &dev->mode_config.connector_list, head) {
66 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
67 connector->connector_type == DRM_MODE_CONNECTOR_eDP)
68 list_move_tail(&connector->head, &panel_list);
71 list_splice(&panel_list, &dev->mode_config.connector_list);
73 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
75 static bool drm_kms_helper_poll = true;
76 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
78 static void drm_mode_validate_flag(struct drm_connector *connector,
81 struct drm_display_mode *mode;
83 if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE |
84 DRM_MODE_FLAG_3D_MASK))
87 list_for_each_entry(mode, &connector->modes, head) {
88 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
89 !(flags & DRM_MODE_FLAG_INTERLACE))
90 mode->status = MODE_NO_INTERLACE;
91 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
92 !(flags & DRM_MODE_FLAG_DBLSCAN))
93 mode->status = MODE_NO_DBLESCAN;
94 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
95 !(flags & DRM_MODE_FLAG_3D_MASK))
96 mode->status = MODE_NO_STEREO;
103 * drm_helper_probe_single_connector_modes - get complete set of display modes
104 * @connector: connector to probe
105 * @maxX: max width for modes
106 * @maxY: max height for modes
108 * Based on the helper callbacks implemented by @connector try to detect all
109 * valid modes. Modes will first be added to the connector's probed_modes list,
110 * then culled (based on validity and the @maxX, @maxY parameters) and put into
111 * the normal modes list.
113 * Intended to be use as a generic implementation of the ->fill_modes()
114 * @connector vfunc for drivers that use the crtc helpers for output mode
115 * filtering and detection.
118 * The number of modes found on @connector.
120 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
121 uint32_t maxX, uint32_t maxY)
123 struct drm_device *dev = connector->dev;
124 struct drm_display_mode *mode;
125 struct drm_connector_helper_funcs *connector_funcs =
126 connector->helper_private;
129 bool verbose_prune = true;
131 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
133 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
134 drm_get_connector_name(connector));
135 /* set all modes to the unverified state */
136 list_for_each_entry(mode, &connector->modes, head)
137 mode->status = MODE_UNVERIFIED;
139 if (connector->force) {
140 if (connector->force == DRM_FORCE_ON)
141 connector->status = connector_status_connected;
143 connector->status = connector_status_disconnected;
144 if (connector->funcs->force)
145 connector->funcs->force(connector);
147 connector->status = connector->funcs->detect(connector, true);
150 /* Re-enable polling in case the global poll config changed. */
151 if (drm_kms_helper_poll != dev->mode_config.poll_running)
152 drm_kms_helper_poll_enable(dev);
154 dev->mode_config.poll_running = drm_kms_helper_poll;
156 if (connector->status == connector_status_disconnected) {
157 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
158 connector->base.id, drm_get_connector_name(connector));
159 drm_mode_connector_update_edid_property(connector, NULL);
160 verbose_prune = false;
164 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
165 count = drm_load_edid_firmware(connector);
168 count = (*connector_funcs->get_modes)(connector);
170 if (count == 0 && connector->status == connector_status_connected)
171 count = drm_add_modes_noedid(connector, 1024, 768);
175 drm_mode_connector_list_update(connector);
178 drm_mode_validate_size(dev, &connector->modes, maxX, maxY);
180 if (connector->interlace_allowed)
181 mode_flags |= DRM_MODE_FLAG_INTERLACE;
182 if (connector->doublescan_allowed)
183 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
184 if (connector->stereo_allowed)
185 mode_flags |= DRM_MODE_FLAG_3D_MASK;
186 drm_mode_validate_flag(connector, mode_flags);
188 list_for_each_entry(mode, &connector->modes, head) {
189 if (mode->status == MODE_OK)
190 mode->status = connector_funcs->mode_valid(connector,
195 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
197 if (list_empty(&connector->modes))
200 list_for_each_entry(mode, &connector->modes, head)
201 mode->vrefresh = drm_mode_vrefresh(mode);
203 drm_mode_sort(&connector->modes);
205 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
206 drm_get_connector_name(connector));
207 list_for_each_entry(mode, &connector->modes, head) {
208 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
209 drm_mode_debug_printmodeline(mode);
214 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
217 * drm_helper_encoder_in_use - check if a given encoder is in use
218 * @encoder: encoder to check
220 * Checks whether @encoder is with the current mode setting output configuration
221 * in use by any connector. This doesn't mean that it is actually enabled since
222 * the DPMS state is tracked separately.
225 * True if @encoder is used, false otherwise.
227 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
229 struct drm_connector *connector;
230 struct drm_device *dev = encoder->dev;
232 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
233 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
234 if (connector->encoder == encoder)
238 EXPORT_SYMBOL(drm_helper_encoder_in_use);
241 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
242 * @crtc: CRTC to check
244 * Checks whether @crtc is with the current mode setting output configuration
245 * in use by any connector. This doesn't mean that it is actually enabled since
246 * the DPMS state is tracked separately.
249 * True if @crtc is used, false otherwise.
251 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
253 struct drm_encoder *encoder;
254 struct drm_device *dev = crtc->dev;
256 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
257 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
258 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
262 EXPORT_SYMBOL(drm_helper_crtc_in_use);
265 drm_encoder_disable(struct drm_encoder *encoder)
267 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
270 encoder->bridge->funcs->disable(encoder->bridge);
272 if (encoder_funcs->disable)
273 (*encoder_funcs->disable)(encoder);
275 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
278 encoder->bridge->funcs->post_disable(encoder->bridge);
281 static void __drm_helper_disable_unused_functions(struct drm_device *dev)
283 struct drm_encoder *encoder;
284 struct drm_connector *connector;
285 struct drm_crtc *crtc;
287 drm_warn_on_modeset_not_all_locked(dev);
289 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
290 if (!connector->encoder)
292 if (connector->status == connector_status_disconnected)
293 connector->encoder = NULL;
296 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
297 if (!drm_helper_encoder_in_use(encoder)) {
298 drm_encoder_disable(encoder);
299 /* disconnector encoder from any connector */
300 encoder->crtc = NULL;
304 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
305 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
306 crtc->enabled = drm_helper_crtc_in_use(crtc);
307 if (!crtc->enabled) {
308 if (crtc_funcs->disable)
309 (*crtc_funcs->disable)(crtc);
311 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
318 * drm_helper_disable_unused_functions - disable unused objects
321 * This function walks through the entire mode setting configuration of @dev. It
322 * will remove any crtc links of unused encoders and encoder links of
323 * disconnected connectors. Then it will disable all unused encoders and crtcs
324 * either by calling their disable callback if available or by calling their
325 * dpms callback with DRM_MODE_DPMS_OFF.
327 void drm_helper_disable_unused_functions(struct drm_device *dev)
329 drm_modeset_lock_all(dev);
330 __drm_helper_disable_unused_functions(dev);
331 drm_modeset_unlock_all(dev);
333 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
336 * Check the CRTC we're going to map each output to vs. its current
337 * CRTC. If they don't match, we have to disable the output and the CRTC
338 * since the driver will have to re-route things.
341 drm_crtc_prepare_encoders(struct drm_device *dev)
343 struct drm_encoder_helper_funcs *encoder_funcs;
344 struct drm_encoder *encoder;
346 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
347 encoder_funcs = encoder->helper_private;
348 /* Disable unused encoders */
349 if (encoder->crtc == NULL)
350 drm_encoder_disable(encoder);
351 /* Disable encoders whose CRTC is about to change */
352 if (encoder_funcs->get_crtc &&
353 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
354 drm_encoder_disable(encoder);
359 * drm_crtc_helper_set_mode - internal helper to set a mode
360 * @crtc: CRTC to program
362 * @x: horizontal offset into the surface
363 * @y: vertical offset into the surface
364 * @old_fb: old framebuffer, for cleanup
366 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
367 * to fixup or reject the mode prior to trying to set it. This is an internal
368 * helper that drivers could e.g. use to update properties that require the
369 * entire output pipe to be disabled and re-enabled in a new configuration. For
370 * example for changing whether audio is enabled on a hdmi link or for changing
371 * panel fitter or dither attributes. It is also called by the
372 * drm_crtc_helper_set_config() helper function to drive the mode setting
376 * True if the mode was set successfully, false otherwise.
378 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
379 struct drm_display_mode *mode,
381 struct drm_framebuffer *old_fb)
383 struct drm_device *dev = crtc->dev;
384 struct drm_display_mode *adjusted_mode, saved_mode;
385 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
386 struct drm_encoder_helper_funcs *encoder_funcs;
387 int saved_x, saved_y;
389 struct drm_encoder *encoder;
392 drm_warn_on_modeset_not_all_locked(dev);
394 saved_enabled = crtc->enabled;
395 crtc->enabled = drm_helper_crtc_in_use(crtc);
399 adjusted_mode = drm_mode_duplicate(dev, mode);
400 if (!adjusted_mode) {
401 crtc->enabled = saved_enabled;
405 saved_mode = crtc->mode;
409 /* Update crtc values up front so the driver can rely on them for mode
416 /* Pass our mode to the connectors and the CRTC to give them a chance to
417 * adjust it according to limitations or connector properties, and also
418 * a chance to reject the mode entirely.
420 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
422 if (encoder->crtc != crtc)
425 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
426 ret = encoder->bridge->funcs->mode_fixup(
427 encoder->bridge, mode, adjusted_mode);
429 DRM_DEBUG_KMS("Bridge fixup failed\n");
434 encoder_funcs = encoder->helper_private;
435 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
437 DRM_DEBUG_KMS("Encoder fixup failed\n");
442 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
443 DRM_DEBUG_KMS("CRTC fixup failed\n");
446 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
448 /* Prepare the encoders and CRTCs before setting the mode. */
449 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
451 if (encoder->crtc != crtc)
455 encoder->bridge->funcs->disable(encoder->bridge);
457 encoder_funcs = encoder->helper_private;
458 /* Disable the encoders as the first thing we do. */
459 encoder_funcs->prepare(encoder);
462 encoder->bridge->funcs->post_disable(encoder->bridge);
465 drm_crtc_prepare_encoders(dev);
467 crtc_funcs->prepare(crtc);
469 /* Set up the DPLL and any encoders state that needs to adjust or depend
472 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
476 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
478 if (encoder->crtc != crtc)
481 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
482 encoder->base.id, drm_get_encoder_name(encoder),
483 mode->base.id, mode->name);
484 encoder_funcs = encoder->helper_private;
485 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
487 if (encoder->bridge && encoder->bridge->funcs->mode_set)
488 encoder->bridge->funcs->mode_set(encoder->bridge, mode,
492 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
493 crtc_funcs->commit(crtc);
495 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
497 if (encoder->crtc != crtc)
501 encoder->bridge->funcs->pre_enable(encoder->bridge);
503 encoder_funcs = encoder->helper_private;
504 encoder_funcs->commit(encoder);
507 encoder->bridge->funcs->enable(encoder->bridge);
510 /* Store real post-adjustment hardware mode. */
511 crtc->hwmode = *adjusted_mode;
513 /* Calculate and store various constants which
514 * are later needed by vblank and swap-completion
515 * timestamping. They are derived from true hwmode.
517 drm_calc_timestamping_constants(crtc, &crtc->hwmode);
519 /* FIXME: add subpixel order */
521 drm_mode_destroy(dev, adjusted_mode);
523 crtc->enabled = saved_enabled;
524 crtc->mode = saved_mode;
531 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
535 drm_crtc_helper_disable(struct drm_crtc *crtc)
537 struct drm_device *dev = crtc->dev;
538 struct drm_connector *connector;
539 struct drm_encoder *encoder;
541 /* Decouple all encoders and their attached connectors from this crtc */
542 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
543 if (encoder->crtc != crtc)
546 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
547 if (connector->encoder != encoder)
550 connector->encoder = NULL;
553 * drm_helper_disable_unused_functions() ought to be
554 * doing this, but since we've decoupled the encoder
555 * from the connector above, the required connection
556 * between them is henceforth no longer available.
558 connector->dpms = DRM_MODE_DPMS_OFF;
562 __drm_helper_disable_unused_functions(dev);
567 * drm_crtc_helper_set_config - set a new config from userspace
568 * @set: mode set configuration
570 * Setup a new configuration, provided by the upper layers (either an ioctl call
571 * from userspace or internally e.g. from the fbdev suppport code) in @set, and
572 * enable it. This is the main helper functions for drivers that implement
573 * kernel mode setting with the crtc helper functions and the assorted
574 * ->prepare(), ->modeset() and ->commit() helper callbacks.
577 * Returns 0 on success, negative errno numbers on failure.
579 int drm_crtc_helper_set_config(struct drm_mode_set *set)
581 struct drm_device *dev;
582 struct drm_crtc *new_crtc;
583 struct drm_encoder *save_encoders, *new_encoder, *encoder;
584 bool mode_changed = false; /* if true do a full mode set */
585 bool fb_changed = false; /* if true and !mode_changed just do a flip */
586 struct drm_connector *save_connectors, *connector;
587 int count = 0, ro, fail = 0;
588 struct drm_crtc_helper_funcs *crtc_funcs;
589 struct drm_mode_set save_set;
597 BUG_ON(!set->crtc->helper_private);
599 /* Enforce sane interface api - has been abused by the fb helper. */
600 BUG_ON(!set->mode && set->fb);
601 BUG_ON(set->fb && set->num_connectors == 0);
603 crtc_funcs = set->crtc->helper_private;
609 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
610 set->crtc->base.id, set->fb->base.id,
611 (int)set->num_connectors, set->x, set->y);
613 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
614 return drm_crtc_helper_disable(set->crtc);
617 dev = set->crtc->dev;
619 drm_warn_on_modeset_not_all_locked(dev);
622 * Allocate space for the backup of all (non-pointer) encoder and
625 save_encoders = kzalloc(dev->mode_config.num_encoder *
626 sizeof(struct drm_encoder), GFP_KERNEL);
630 save_connectors = kzalloc(dev->mode_config.num_connector *
631 sizeof(struct drm_connector), GFP_KERNEL);
632 if (!save_connectors) {
633 kfree(save_encoders);
638 * Copy data. Note that driver private data is not affected.
639 * Should anything bad happen only the expected state is
640 * restored, not the drivers personal bookkeeping.
643 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
644 save_encoders[count++] = *encoder;
648 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
649 save_connectors[count++] = *connector;
652 save_set.crtc = set->crtc;
653 save_set.mode = &set->crtc->mode;
654 save_set.x = set->crtc->x;
655 save_set.y = set->crtc->y;
656 save_set.fb = set->crtc->fb;
658 /* We should be able to check here if the fb has the same properties
659 * and then just flip_or_move it */
660 if (set->crtc->fb != set->fb) {
661 /* If we have no fb then treat it as a full mode set */
662 if (set->crtc->fb == NULL) {
663 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
665 } else if (set->fb == NULL) {
667 } else if (set->fb->pixel_format !=
668 set->crtc->fb->pixel_format) {
674 if (set->x != set->crtc->x || set->y != set->crtc->y)
677 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
678 DRM_DEBUG_KMS("modes are different, full mode set\n");
679 drm_mode_debug_printmodeline(&set->crtc->mode);
680 drm_mode_debug_printmodeline(set->mode);
684 /* a) traverse passed in connector list and get encoders for them */
686 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
687 struct drm_connector_helper_funcs *connector_funcs =
688 connector->helper_private;
689 new_encoder = connector->encoder;
690 for (ro = 0; ro < set->num_connectors; ro++) {
691 if (set->connectors[ro] == connector) {
692 new_encoder = connector_funcs->best_encoder(connector);
693 /* if we can't get an encoder for a connector
694 we are setting now - then fail */
695 if (new_encoder == NULL)
696 /* don't break so fail path works correct */
700 if (connector->dpms != DRM_MODE_DPMS_ON) {
701 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
707 if (new_encoder != connector->encoder) {
708 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
710 /* If the encoder is reused for another connector, then
711 * the appropriate crtc will be set later.
713 if (connector->encoder)
714 connector->encoder->crtc = NULL;
715 connector->encoder = new_encoder;
725 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
726 if (!connector->encoder)
729 if (connector->encoder->crtc == set->crtc)
732 new_crtc = connector->encoder->crtc;
734 for (ro = 0; ro < set->num_connectors; ro++) {
735 if (set->connectors[ro] == connector)
736 new_crtc = set->crtc;
739 /* Make sure the new CRTC will work with the encoder */
741 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
745 if (new_crtc != connector->encoder->crtc) {
746 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
748 connector->encoder->crtc = new_crtc;
751 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
752 connector->base.id, drm_get_connector_name(connector),
755 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
756 connector->base.id, drm_get_connector_name(connector));
760 /* mode_set_base is not a required function */
761 if (fb_changed && !crtc_funcs->mode_set_base)
765 if (drm_helper_crtc_in_use(set->crtc)) {
766 DRM_DEBUG_KMS("attempting to set mode from"
768 drm_mode_debug_printmodeline(set->mode);
769 set->crtc->fb = set->fb;
770 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
773 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
775 set->crtc->fb = save_set.fb;
779 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
780 for (i = 0; i < set->num_connectors; i++) {
781 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
782 drm_get_connector_name(set->connectors[i]));
783 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
786 __drm_helper_disable_unused_functions(dev);
787 } else if (fb_changed) {
788 set->crtc->x = set->x;
789 set->crtc->y = set->y;
790 set->crtc->fb = set->fb;
791 ret = crtc_funcs->mode_set_base(set->crtc,
792 set->x, set->y, save_set.fb);
794 set->crtc->x = save_set.x;
795 set->crtc->y = save_set.y;
796 set->crtc->fb = save_set.fb;
801 kfree(save_connectors);
802 kfree(save_encoders);
806 /* Restore all previous data. */
808 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
809 *encoder = save_encoders[count++];
813 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
814 *connector = save_connectors[count++];
817 /* Try to restore the config */
819 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
820 save_set.y, save_set.fb))
821 DRM_ERROR("failed to restore config after modeset failure\n");
823 kfree(save_connectors);
824 kfree(save_encoders);
827 EXPORT_SYMBOL(drm_crtc_helper_set_config);
829 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
831 int dpms = DRM_MODE_DPMS_OFF;
832 struct drm_connector *connector;
833 struct drm_device *dev = encoder->dev;
835 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
836 if (connector->encoder == encoder)
837 if (connector->dpms < dpms)
838 dpms = connector->dpms;
842 /* Helper which handles bridge ordering around encoder dpms */
843 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
845 struct drm_bridge *bridge = encoder->bridge;
846 struct drm_encoder_helper_funcs *encoder_funcs;
849 if (mode == DRM_MODE_DPMS_ON)
850 bridge->funcs->pre_enable(bridge);
852 bridge->funcs->disable(bridge);
855 encoder_funcs = encoder->helper_private;
856 if (encoder_funcs->dpms)
857 encoder_funcs->dpms(encoder, mode);
860 if (mode == DRM_MODE_DPMS_ON)
861 bridge->funcs->enable(bridge);
863 bridge->funcs->post_disable(bridge);
867 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
869 int dpms = DRM_MODE_DPMS_OFF;
870 struct drm_connector *connector;
871 struct drm_device *dev = crtc->dev;
873 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
874 if (connector->encoder && connector->encoder->crtc == crtc)
875 if (connector->dpms < dpms)
876 dpms = connector->dpms;
881 * drm_helper_connector_dpms() - connector dpms helper implementation
882 * @connector: affected connector
885 * This is the main helper function provided by the crtc helper framework for
886 * implementing the DPMS connector attribute. It computes the new desired DPMS
887 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
888 * callback provided by the driver appropriately.
890 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
892 struct drm_encoder *encoder = connector->encoder;
893 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
894 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
896 if (mode == connector->dpms)
899 old_dpms = connector->dpms;
900 connector->dpms = mode;
903 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
905 /* from off to on, do crtc then encoder */
906 if (mode < old_dpms) {
908 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
909 if (crtc_funcs->dpms)
910 (*crtc_funcs->dpms) (crtc,
911 drm_helper_choose_crtc_dpms(crtc));
914 drm_helper_encoder_dpms(encoder, encoder_dpms);
917 /* from on to off, do encoder then crtc */
918 if (mode > old_dpms) {
920 drm_helper_encoder_dpms(encoder, encoder_dpms);
922 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
923 if (crtc_funcs->dpms)
924 (*crtc_funcs->dpms) (crtc,
925 drm_helper_choose_crtc_dpms(crtc));
931 EXPORT_SYMBOL(drm_helper_connector_dpms);
934 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
935 * @fb: drm_framebuffer object to fill out
936 * @mode_cmd: metadata from the userspace fb creation request
938 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
941 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
942 struct drm_mode_fb_cmd2 *mode_cmd)
946 fb->width = mode_cmd->width;
947 fb->height = mode_cmd->height;
948 for (i = 0; i < 4; i++) {
949 fb->pitches[i] = mode_cmd->pitches[i];
950 fb->offsets[i] = mode_cmd->offsets[i];
952 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
953 &fb->bits_per_pixel);
954 fb->pixel_format = mode_cmd->pixel_format;
956 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
959 * drm_helper_resume_force_mode - force-restore mode setting configuration
960 * @dev: drm_device which should be restored
962 * Drivers which use the mode setting helpers can use this function to
963 * force-restore the mode setting configuration e.g. on resume or when something
964 * else might have trampled over the hw state (like some overzealous old BIOSen
967 * This helper doesn't provide a error return value since restoring the old
968 * config should never fail due to resource allocation issues since the driver
969 * has successfully set the restored configuration already. Hence this should
970 * boil down to the equivalent of a few dpms on calls, which also don't provide
973 * Drivers where simply restoring an old configuration again might fail (e.g.
974 * due to slight differences in allocating shared resources when the
975 * configuration is restored in a different order than when userspace set it up)
976 * need to use their own restore logic.
978 void drm_helper_resume_force_mode(struct drm_device *dev)
980 struct drm_crtc *crtc;
981 struct drm_encoder *encoder;
982 struct drm_crtc_helper_funcs *crtc_funcs;
986 drm_modeset_lock_all(dev);
987 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
992 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
993 crtc->x, crtc->y, crtc->fb);
995 /* Restoring the old config should never fail! */
997 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
999 /* Turn off outputs that were already powered off */
1000 if (drm_helper_choose_crtc_dpms(crtc)) {
1001 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
1003 if(encoder->crtc != crtc)
1006 encoder_dpms = drm_helper_choose_encoder_dpms(
1009 drm_helper_encoder_dpms(encoder, encoder_dpms);
1012 crtc_funcs = crtc->helper_private;
1013 if (crtc_funcs->dpms)
1014 (*crtc_funcs->dpms) (crtc,
1015 drm_helper_choose_crtc_dpms(crtc));
1019 /* disable the unused connectors while restoring the modesetting */
1020 __drm_helper_disable_unused_functions(dev);
1021 drm_modeset_unlock_all(dev);
1023 EXPORT_SYMBOL(drm_helper_resume_force_mode);
1026 * drm_kms_helper_hotplug_event - fire off KMS hotplug events
1027 * @dev: drm_device whose connector state changed
1029 * This function fires off the uevent for userspace and also calls the
1030 * output_poll_changed function, which is most commonly used to inform the fbdev
1031 * emulation code and allow it to update the fbcon output configuration.
1033 * Drivers should call this from their hotplug handling code when a change is
1034 * detected. Note that this function does not do any output detection of its
1035 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
1038 * This function must be called from process context with no mode
1039 * setting locks held.
1041 void drm_kms_helper_hotplug_event(struct drm_device *dev)
1043 /* send a uevent + call fbdev */
1044 drm_sysfs_hotplug_event(dev);
1045 if (dev->mode_config.funcs->output_poll_changed)
1046 dev->mode_config.funcs->output_poll_changed(dev);
1048 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
1050 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1051 static void output_poll_execute(struct work_struct *work)
1053 struct delayed_work *delayed_work = to_delayed_work(work);
1054 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
1055 struct drm_connector *connector;
1056 enum drm_connector_status old_status;
1057 bool repoll = false, changed = false;
1059 if (!drm_kms_helper_poll)
1062 mutex_lock(&dev->mode_config.mutex);
1063 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1065 /* Ignore forced connectors. */
1066 if (connector->force)
1069 /* Ignore HPD capable connectors and connectors where we don't
1070 * want any hotplug detection at all for polling. */
1071 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
1076 old_status = connector->status;
1077 /* if we are connected and don't want to poll for disconnect
1079 if (old_status == connector_status_connected &&
1080 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1083 connector->status = connector->funcs->detect(connector, false);
1084 if (old_status != connector->status) {
1085 const char *old, *new;
1087 old = drm_get_connector_status_name(old_status);
1088 new = drm_get_connector_status_name(connector->status);
1090 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1091 "status updated from %s to %s\n",
1093 drm_get_connector_name(connector),
1100 mutex_unlock(&dev->mode_config.mutex);
1103 drm_kms_helper_hotplug_event(dev);
1106 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1110 * drm_kms_helper_poll_disable - disable output polling
1113 * This function disables the output polling work.
1115 * Drivers can call this helper from their device suspend implementation. It is
1116 * not an error to call this even when output polling isn't enabled or arlready
1119 void drm_kms_helper_poll_disable(struct drm_device *dev)
1121 if (!dev->mode_config.poll_enabled)
1123 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1125 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1128 * drm_kms_helper_poll_enable - re-enable output polling.
1131 * This function re-enables the output polling work.
1133 * Drivers can call this helper from their device resume implementation. It is
1134 * an error to call this when the output polling support has not yet been set
1137 void drm_kms_helper_poll_enable(struct drm_device *dev)
1140 struct drm_connector *connector;
1142 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1145 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1146 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1147 DRM_CONNECTOR_POLL_DISCONNECT))
1152 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1154 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1157 * drm_kms_helper_poll_init - initialize and enable output polling
1160 * This function intializes and then also enables output polling support for
1161 * @dev. Drivers which do not have reliable hotplug support in hardware can use
1162 * this helper infrastructure to regularly poll such connectors for changes in
1163 * their connection state.
1165 * Drivers can control which connectors are polled by setting the
1166 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
1167 * connectors where probing live outputs can result in visual distortion drivers
1168 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
1169 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
1170 * completely ignored by the polling logic.
1172 * Note that a connector can be both polled and probed from the hotplug handler,
1173 * in case the hotplug interrupt is known to be unreliable.
1175 void drm_kms_helper_poll_init(struct drm_device *dev)
1177 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1178 dev->mode_config.poll_enabled = true;
1180 drm_kms_helper_poll_enable(dev);
1182 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1185 * drm_kms_helper_poll_fini - disable output polling and clean it up
1188 void drm_kms_helper_poll_fini(struct drm_device *dev)
1190 drm_kms_helper_poll_disable(dev);
1192 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1195 * drm_helper_hpd_irq_event - hotplug processing
1198 * Drivers can use this helper function to run a detect cycle on all connectors
1199 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
1200 * other connectors are ignored, which is useful to avoid reprobing fixed
1203 * This helper function is useful for drivers which can't or don't track hotplug
1204 * interrupts for each connector.
1206 * Drivers which support hotplug interrupts for each connector individually and
1207 * which have a more fine-grained detect logic should bypass this code and
1208 * directly call drm_kms_helper_hotplug_event() in case the connector state
1211 * This function must be called from process context with no mode
1212 * setting locks held.
1214 * Note that a connector can be both polled and probed from the hotplug handler,
1215 * in case the hotplug interrupt is known to be unreliable.
1217 bool drm_helper_hpd_irq_event(struct drm_device *dev)
1219 struct drm_connector *connector;
1220 enum drm_connector_status old_status;
1221 bool changed = false;
1223 if (!dev->mode_config.poll_enabled)
1226 mutex_lock(&dev->mode_config.mutex);
1227 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1229 /* Only handle HPD capable connectors. */
1230 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1233 old_status = connector->status;
1235 connector->status = connector->funcs->detect(connector, false);
1236 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1238 drm_get_connector_name(connector),
1239 drm_get_connector_status_name(old_status),
1240 drm_get_connector_status_name(connector->status));
1241 if (old_status != connector->status)
1245 mutex_unlock(&dev->mode_config.mutex);
1248 drm_kms_helper_hotplug_event(dev);
1252 EXPORT_SYMBOL(drm_helper_hpd_irq_event);