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;
125 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
126 drm_get_connector_name(connector));
127 /* set all modes to the unverified state */
128 list_for_each_entry(mode, &connector->modes, head)
129 mode->status = MODE_UNVERIFIED;
131 if (connector->force) {
132 if (connector->force == DRM_FORCE_ON)
133 connector->status = connector_status_connected;
135 connector->status = connector_status_disconnected;
136 if (connector->funcs->force)
137 connector->funcs->force(connector);
139 connector->status = connector->funcs->detect(connector, true);
142 /* Re-enable polling in case the global poll config changed. */
143 if (drm_kms_helper_poll != dev->mode_config.poll_running)
144 drm_kms_helper_poll_enable(dev);
146 dev->mode_config.poll_running = drm_kms_helper_poll;
148 if (connector->status == connector_status_disconnected) {
149 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
150 connector->base.id, drm_get_connector_name(connector));
151 drm_mode_connector_update_edid_property(connector, NULL);
155 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
156 count = drm_load_edid_firmware(connector);
159 count = (*connector_funcs->get_modes)(connector);
161 if (count == 0 && connector->status == connector_status_connected)
162 count = drm_add_modes_noedid(connector, 1024, 768);
166 drm_mode_connector_list_update(connector);
169 drm_mode_validate_size(dev, &connector->modes, maxX,
172 if (connector->interlace_allowed)
173 mode_flags |= DRM_MODE_FLAG_INTERLACE;
174 if (connector->doublescan_allowed)
175 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
176 drm_mode_validate_flag(connector, mode_flags);
178 list_for_each_entry(mode, &connector->modes, head) {
179 if (mode->status == MODE_OK)
180 mode->status = connector_funcs->mode_valid(connector,
185 drm_mode_prune_invalid(dev, &connector->modes, true);
187 if (list_empty(&connector->modes))
190 drm_mode_sort(&connector->modes);
192 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
193 drm_get_connector_name(connector));
194 list_for_each_entry(mode, &connector->modes, head) {
195 mode->vrefresh = drm_mode_vrefresh(mode);
197 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
198 drm_mode_debug_printmodeline(mode);
203 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
206 * drm_helper_encoder_in_use - check if a given encoder is in use
207 * @encoder: encoder to check
210 * Caller must hold mode config lock.
212 * Walk @encoders's DRM device's mode_config and see if it's in use.
215 * True if @encoder is part of the mode_config, false otherwise.
217 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
219 struct drm_connector *connector;
220 struct drm_device *dev = encoder->dev;
221 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
222 if (connector->encoder == encoder)
226 EXPORT_SYMBOL(drm_helper_encoder_in_use);
229 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
230 * @crtc: CRTC to check
233 * Caller must hold mode config lock.
235 * Walk @crtc's DRM device's mode_config and see if it's in use.
238 * True if @crtc is part of the mode_config, false otherwise.
240 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
242 struct drm_encoder *encoder;
243 struct drm_device *dev = crtc->dev;
244 /* FIXME: Locking around list access? */
245 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
246 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
250 EXPORT_SYMBOL(drm_helper_crtc_in_use);
253 drm_encoder_disable(struct drm_encoder *encoder)
255 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
257 if (encoder_funcs->disable)
258 (*encoder_funcs->disable)(encoder);
260 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
264 * drm_helper_disable_unused_functions - disable unused objects
268 * Caller must hold mode config lock.
270 * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
271 * by calling its dpms function, which should power it off.
273 void drm_helper_disable_unused_functions(struct drm_device *dev)
275 struct drm_encoder *encoder;
276 struct drm_connector *connector;
277 struct drm_crtc *crtc;
279 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
280 if (!connector->encoder)
282 if (connector->status == connector_status_disconnected)
283 connector->encoder = NULL;
286 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
287 if (!drm_helper_encoder_in_use(encoder)) {
288 drm_encoder_disable(encoder);
289 /* disconnector encoder from any connector */
290 encoder->crtc = NULL;
294 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
295 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
296 crtc->enabled = drm_helper_crtc_in_use(crtc);
297 if (!crtc->enabled) {
298 if (crtc_funcs->disable)
299 (*crtc_funcs->disable)(crtc);
301 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
306 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
309 * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
310 * @encoder: encoder to test
311 * @crtc: crtc to test
313 * Return false if @encoder can't be driven by @crtc, true otherwise.
315 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
316 struct drm_crtc *crtc)
318 struct drm_device *dev;
319 struct drm_crtc *tmp;
322 WARN(!crtc, "checking null crtc?\n");
326 list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
332 if (encoder->possible_crtcs & crtc_mask)
338 * Check the CRTC we're going to map each output to vs. its current
339 * CRTC. If they don't match, we have to disable the output and the CRTC
340 * since the driver will have to re-route things.
343 drm_crtc_prepare_encoders(struct drm_device *dev)
345 struct drm_encoder_helper_funcs *encoder_funcs;
346 struct drm_encoder *encoder;
348 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
349 encoder_funcs = encoder->helper_private;
350 /* Disable unused encoders */
351 if (encoder->crtc == NULL)
352 drm_encoder_disable(encoder);
353 /* Disable encoders whose CRTC is about to change */
354 if (encoder_funcs->get_crtc &&
355 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
356 drm_encoder_disable(encoder);
361 * drm_crtc_helper_set_mode - internal helper to set a mode
362 * @crtc: CRTC to program
364 * @x: horizontal offset into the surface
365 * @y: vertical offset into the surface
366 * @old_fb: old framebuffer, for cleanup
369 * Caller must hold mode config lock.
371 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
372 * to fixup or reject the mode prior to trying to set it. This is an internal
373 * helper that drivers could e.g. use to update properties that require the
374 * entire output pipe to be disabled and re-enabled in a new configuration. For
375 * example for changing whether audio is enabled on a hdmi link or for changing
376 * panel fitter or dither attributes. It is also called by the
377 * drm_crtc_helper_set_config() helper function to drive the mode setting
381 * True if the mode was set successfully, or false otherwise.
383 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
384 struct drm_display_mode *mode,
386 struct drm_framebuffer *old_fb)
388 struct drm_device *dev = crtc->dev;
389 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
390 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
391 struct drm_encoder_helper_funcs *encoder_funcs;
392 int saved_x, saved_y;
393 struct drm_encoder *encoder;
396 crtc->enabled = drm_helper_crtc_in_use(crtc);
400 adjusted_mode = drm_mode_duplicate(dev, mode);
404 saved_hwmode = crtc->hwmode;
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)
424 encoder_funcs = encoder->helper_private;
425 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
427 DRM_DEBUG_KMS("Encoder fixup failed\n");
432 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
433 DRM_DEBUG_KMS("CRTC fixup failed\n");
436 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
438 /* Prepare the encoders and CRTCs before setting the mode. */
439 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
441 if (encoder->crtc != crtc)
443 encoder_funcs = encoder->helper_private;
444 /* Disable the encoders as the first thing we do. */
445 encoder_funcs->prepare(encoder);
448 drm_crtc_prepare_encoders(dev);
450 crtc_funcs->prepare(crtc);
452 /* Set up the DPLL and any encoders state that needs to adjust or depend
455 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
459 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
461 if (encoder->crtc != crtc)
464 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
465 encoder->base.id, drm_get_encoder_name(encoder),
466 mode->base.id, mode->name);
467 encoder_funcs = encoder->helper_private;
468 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
471 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
472 crtc_funcs->commit(crtc);
474 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
476 if (encoder->crtc != crtc)
479 encoder_funcs = encoder->helper_private;
480 encoder_funcs->commit(encoder);
484 /* Store real post-adjustment hardware mode. */
485 crtc->hwmode = *adjusted_mode;
487 /* Calculate and store various constants which
488 * are later needed by vblank and swap-completion
489 * timestamping. They are derived from true hwmode.
491 drm_calc_timestamping_constants(crtc);
493 /* FIXME: add subpixel order */
495 drm_mode_destroy(dev, adjusted_mode);
497 crtc->hwmode = saved_hwmode;
498 crtc->mode = saved_mode;
505 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
509 drm_crtc_helper_disable(struct drm_crtc *crtc)
511 struct drm_device *dev = crtc->dev;
512 struct drm_connector *connector;
513 struct drm_encoder *encoder;
515 /* Decouple all encoders and their attached connectors from this crtc */
516 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
517 if (encoder->crtc != crtc)
520 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
521 if (connector->encoder != encoder)
524 connector->encoder = NULL;
528 drm_helper_disable_unused_functions(dev);
533 * drm_crtc_helper_set_config - set a new config from userspace
534 * @set: mode set configuration
537 * Caller must hold mode config lock.
539 * Setup a new configuration, provided by the upper layers (either an ioctl call
540 * from userspace or internally e.g. from the fbdev suppport code) in @set, and
541 * enable it. This is the main helper functions for drivers that implement
542 * kernel mode setting with the crtc helper functions and the assorted
543 * ->prepare(), ->modeset() and ->commit() helper callbacks.
546 * Returns 0 on success, -ERRNO on failure.
548 int drm_crtc_helper_set_config(struct drm_mode_set *set)
550 struct drm_device *dev;
551 struct drm_crtc *save_crtcs, *new_crtc, *crtc;
552 struct drm_encoder *save_encoders, *new_encoder, *encoder;
553 struct drm_framebuffer *old_fb = NULL;
554 bool mode_changed = false; /* if true do a full mode set */
555 bool fb_changed = false; /* if true and !mode_changed just do a flip */
556 struct drm_connector *save_connectors, *connector;
557 int count = 0, ro, fail = 0;
558 struct drm_crtc_helper_funcs *crtc_funcs;
559 struct drm_mode_set save_set;
571 if (!set->crtc->helper_private)
574 crtc_funcs = set->crtc->helper_private;
580 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
581 set->crtc->base.id, set->fb->base.id,
582 (int)set->num_connectors, set->x, set->y);
584 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
585 return drm_crtc_helper_disable(set->crtc);
588 dev = set->crtc->dev;
590 /* Allocate space for the backup of all (non-pointer) crtc, encoder and
592 save_crtcs = kzalloc(dev->mode_config.num_crtc *
593 sizeof(struct drm_crtc), GFP_KERNEL);
597 save_encoders = kzalloc(dev->mode_config.num_encoder *
598 sizeof(struct drm_encoder), GFP_KERNEL);
599 if (!save_encoders) {
604 save_connectors = kzalloc(dev->mode_config.num_connector *
605 sizeof(struct drm_connector), GFP_KERNEL);
606 if (!save_connectors) {
608 kfree(save_encoders);
612 /* Copy data. Note that driver private data is not affected.
613 * Should anything bad happen only the expected state is
614 * restored, not the drivers personal bookkeeping.
617 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
618 save_crtcs[count++] = *crtc;
622 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
623 save_encoders[count++] = *encoder;
627 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
628 save_connectors[count++] = *connector;
631 save_set.crtc = set->crtc;
632 save_set.mode = &set->crtc->mode;
633 save_set.x = set->crtc->x;
634 save_set.y = set->crtc->y;
635 save_set.fb = set->crtc->fb;
637 /* We should be able to check here if the fb has the same properties
638 * and then just flip_or_move it */
639 if (set->crtc->fb != set->fb) {
640 /* If we have no fb then treat it as a full mode set */
641 if (set->crtc->fb == NULL) {
642 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
644 } else if (set->fb == NULL) {
646 } else if (set->fb->depth != set->crtc->fb->depth) {
648 } else if (set->fb->bits_per_pixel !=
649 set->crtc->fb->bits_per_pixel) {
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;
757 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
758 for (i = 0; i < set->num_connectors; i++) {
759 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
760 drm_get_connector_name(set->connectors[i]));
761 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
764 drm_helper_disable_unused_functions(dev);
765 } else if (fb_changed) {
766 set->crtc->x = set->x;
767 set->crtc->y = set->y;
769 old_fb = set->crtc->fb;
770 if (set->crtc->fb != set->fb)
771 set->crtc->fb = set->fb;
772 ret = crtc_funcs->mode_set_base(set->crtc,
773 set->x, set->y, old_fb);
775 set->crtc->fb = old_fb;
780 kfree(save_connectors);
781 kfree(save_encoders);
786 /* Restore all previous data. */
788 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
789 *crtc = save_crtcs[count++];
793 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
794 *encoder = save_encoders[count++];
798 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
799 *connector = save_connectors[count++];
802 /* Try to restore the config */
804 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
805 save_set.y, save_set.fb))
806 DRM_ERROR("failed to restore config after modeset failure\n");
808 kfree(save_connectors);
809 kfree(save_encoders);
813 EXPORT_SYMBOL(drm_crtc_helper_set_config);
815 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
817 int dpms = DRM_MODE_DPMS_OFF;
818 struct drm_connector *connector;
819 struct drm_device *dev = encoder->dev;
821 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
822 if (connector->encoder == encoder)
823 if (connector->dpms < dpms)
824 dpms = connector->dpms;
828 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
830 int dpms = DRM_MODE_DPMS_OFF;
831 struct drm_connector *connector;
832 struct drm_device *dev = crtc->dev;
834 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
835 if (connector->encoder && connector->encoder->crtc == crtc)
836 if (connector->dpms < dpms)
837 dpms = connector->dpms;
842 * drm_helper_connector_dpms() - connector dpms helper implementation
843 * @connector: affected connector
846 * This is the main helper function provided by the crtc helper framework for
847 * implementing the DPMS connector attribute. It computes the new desired DPMS
848 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
849 * callback provided by the driver appropriately.
851 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
853 struct drm_encoder *encoder = connector->encoder;
854 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
857 if (mode == connector->dpms)
860 old_dpms = connector->dpms;
861 connector->dpms = mode;
863 /* from off to on, do crtc then encoder */
864 if (mode < old_dpms) {
866 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
867 if (crtc_funcs->dpms)
868 (*crtc_funcs->dpms) (crtc,
869 drm_helper_choose_crtc_dpms(crtc));
872 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
873 if (encoder_funcs->dpms)
874 (*encoder_funcs->dpms) (encoder,
875 drm_helper_choose_encoder_dpms(encoder));
879 /* from on to off, do encoder then crtc */
880 if (mode > old_dpms) {
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));
888 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
889 if (crtc_funcs->dpms)
890 (*crtc_funcs->dpms) (crtc,
891 drm_helper_choose_crtc_dpms(crtc));
897 EXPORT_SYMBOL(drm_helper_connector_dpms);
899 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
900 struct drm_mode_fb_cmd2 *mode_cmd)
904 fb->width = mode_cmd->width;
905 fb->height = mode_cmd->height;
906 for (i = 0; i < 4; i++) {
907 fb->pitches[i] = mode_cmd->pitches[i];
908 fb->offsets[i] = mode_cmd->offsets[i];
910 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
911 &fb->bits_per_pixel);
912 fb->pixel_format = mode_cmd->pixel_format;
916 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
918 int drm_helper_resume_force_mode(struct drm_device *dev)
920 struct drm_crtc *crtc;
921 struct drm_encoder *encoder;
922 struct drm_encoder_helper_funcs *encoder_funcs;
923 struct drm_crtc_helper_funcs *crtc_funcs;
926 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
931 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
932 crtc->x, crtc->y, crtc->fb);
935 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
937 /* Turn off outputs that were already powered off */
938 if (drm_helper_choose_crtc_dpms(crtc)) {
939 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
941 if(encoder->crtc != crtc)
944 encoder_funcs = encoder->helper_private;
945 if (encoder_funcs->dpms)
946 (*encoder_funcs->dpms) (encoder,
947 drm_helper_choose_encoder_dpms(encoder));
950 crtc_funcs = crtc->helper_private;
951 if (crtc_funcs->dpms)
952 (*crtc_funcs->dpms) (crtc,
953 drm_helper_choose_crtc_dpms(crtc));
956 /* disable the unused connectors while restoring the modesetting */
957 drm_helper_disable_unused_functions(dev);
960 EXPORT_SYMBOL(drm_helper_resume_force_mode);
962 void drm_kms_helper_hotplug_event(struct drm_device *dev)
964 /* send a uevent + call fbdev */
965 drm_sysfs_hotplug_event(dev);
966 if (dev->mode_config.funcs->output_poll_changed)
967 dev->mode_config.funcs->output_poll_changed(dev);
969 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
971 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
972 static void output_poll_execute(struct work_struct *work)
974 struct delayed_work *delayed_work = to_delayed_work(work);
975 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
976 struct drm_connector *connector;
977 enum drm_connector_status old_status;
978 bool repoll = false, changed = false;
980 if (!drm_kms_helper_poll)
983 mutex_lock(&dev->mode_config.mutex);
984 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
986 /* Ignore forced connectors. */
987 if (connector->force)
990 /* Ignore HPD capable connectors and connectors where we don't
991 * want any hotplug detection at all for polling. */
992 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
997 old_status = connector->status;
998 /* if we are connected and don't want to poll for disconnect
1000 if (old_status == connector_status_connected &&
1001 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1004 connector->status = connector->funcs->detect(connector, false);
1005 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
1007 drm_get_connector_name(connector),
1008 old_status, connector->status);
1009 if (old_status != connector->status)
1013 mutex_unlock(&dev->mode_config.mutex);
1016 drm_kms_helper_hotplug_event(dev);
1019 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1022 void drm_kms_helper_poll_disable(struct drm_device *dev)
1024 if (!dev->mode_config.poll_enabled)
1026 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1028 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1030 void drm_kms_helper_poll_enable(struct drm_device *dev)
1033 struct drm_connector *connector;
1035 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1038 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1039 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1040 DRM_CONNECTOR_POLL_DISCONNECT))
1045 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1047 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1049 void drm_kms_helper_poll_init(struct drm_device *dev)
1051 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1052 dev->mode_config.poll_enabled = true;
1054 drm_kms_helper_poll_enable(dev);
1056 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1058 void drm_kms_helper_poll_fini(struct drm_device *dev)
1060 drm_kms_helper_poll_disable(dev);
1062 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1064 void drm_helper_hpd_irq_event(struct drm_device *dev)
1066 struct drm_connector *connector;
1067 enum drm_connector_status old_status;
1068 bool changed = false;
1070 if (!dev->mode_config.poll_enabled)
1073 mutex_lock(&dev->mode_config.mutex);
1074 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1076 /* Only handle HPD capable connectors. */
1077 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1080 old_status = connector->status;
1082 connector->status = connector->funcs->detect(connector, false);
1083 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
1085 drm_get_connector_name(connector),
1086 old_status, connector->status);
1087 if (old_status != connector->status)
1091 mutex_unlock(&dev->mode_config.mutex);
1094 drm_kms_helper_hotplug_event(dev);
1096 EXPORT_SYMBOL(drm_helper_hpd_irq_event);