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;
125 enum drm_connector_status old_status;
127 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
128 drm_get_connector_name(connector));
129 /* set all modes to the unverified state */
130 list_for_each_entry(mode, &connector->modes, head)
131 mode->status = MODE_UNVERIFIED;
133 if (connector->force) {
134 if (connector->force == DRM_FORCE_ON)
135 connector->status = connector_status_connected;
137 connector->status = connector_status_disconnected;
138 if (connector->funcs->force)
139 connector->funcs->force(connector);
141 old_status = connector->status;
143 connector->status = connector->funcs->detect(connector, true);
146 * Normally either the driver's hpd code or the poll loop should
147 * pick up any changes and fire the hotplug event. But if
148 * userspace sneaks in a probe, we might miss a change. Hence
149 * check here, and if anything changed start the hotplug code.
151 if (old_status != connector->status) {
152 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
154 drm_get_connector_name(connector),
155 old_status, connector->status);
158 * The hotplug event code might call into the fb
159 * helpers, and so expects that we do not hold any
160 * locks. Fire up the poll struct instead, it will
161 * disable itself again.
163 dev->mode_config.delayed_event = true;
164 schedule_delayed_work(&dev->mode_config.output_poll_work,
169 /* Re-enable polling in case the global poll config changed. */
170 if (drm_kms_helper_poll != dev->mode_config.poll_running)
171 drm_kms_helper_poll_enable(dev);
173 dev->mode_config.poll_running = drm_kms_helper_poll;
175 if (connector->status == connector_status_disconnected) {
176 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
177 connector->base.id, drm_get_connector_name(connector));
178 drm_mode_connector_update_edid_property(connector, NULL);
179 verbose_prune = false;
183 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
184 count = drm_load_edid_firmware(connector);
187 count = (*connector_funcs->get_modes)(connector);
189 if (count == 0 && connector->status == connector_status_connected)
190 count = drm_add_modes_noedid(connector, 1024, 768);
194 drm_mode_connector_list_update(connector);
197 drm_mode_validate_size(dev, &connector->modes, maxX,
200 if (connector->interlace_allowed)
201 mode_flags |= DRM_MODE_FLAG_INTERLACE;
202 if (connector->doublescan_allowed)
203 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
204 drm_mode_validate_flag(connector, mode_flags);
206 list_for_each_entry(mode, &connector->modes, head) {
207 if (mode->status == MODE_OK)
208 mode->status = connector_funcs->mode_valid(connector,
213 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
215 if (list_empty(&connector->modes))
218 list_for_each_entry(mode, &connector->modes, head)
219 mode->vrefresh = drm_mode_vrefresh(mode);
221 drm_mode_sort(&connector->modes);
223 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
224 drm_get_connector_name(connector));
225 list_for_each_entry(mode, &connector->modes, head) {
226 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
227 drm_mode_debug_printmodeline(mode);
232 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
235 * drm_helper_encoder_in_use - check if a given encoder is in use
236 * @encoder: encoder to check
239 * Caller must hold mode config lock.
241 * Walk @encoders's DRM device's mode_config and see if it's in use.
244 * True if @encoder is part of the mode_config, false otherwise.
246 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
248 struct drm_connector *connector;
249 struct drm_device *dev = encoder->dev;
250 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
251 if (connector->encoder == encoder)
255 EXPORT_SYMBOL(drm_helper_encoder_in_use);
258 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
259 * @crtc: CRTC to check
262 * Caller must hold mode config lock.
264 * Walk @crtc's DRM device's mode_config and see if it's in use.
267 * True if @crtc is part of the mode_config, false otherwise.
269 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
271 struct drm_encoder *encoder;
272 struct drm_device *dev = crtc->dev;
273 /* FIXME: Locking around list access? */
274 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
275 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
279 EXPORT_SYMBOL(drm_helper_crtc_in_use);
282 drm_encoder_disable(struct drm_encoder *encoder)
284 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
286 if (encoder_funcs->disable)
287 (*encoder_funcs->disable)(encoder);
289 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
293 * drm_helper_disable_unused_functions - disable unused objects
297 * Caller must hold mode config lock.
299 * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
300 * by calling its dpms function, which should power it off.
302 void drm_helper_disable_unused_functions(struct drm_device *dev)
304 struct drm_encoder *encoder;
305 struct drm_connector *connector;
306 struct drm_crtc *crtc;
308 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
309 if (!connector->encoder)
311 if (connector->status == connector_status_disconnected)
312 connector->encoder = NULL;
315 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
316 if (!drm_helper_encoder_in_use(encoder)) {
317 drm_encoder_disable(encoder);
318 /* disconnector encoder from any connector */
319 encoder->crtc = NULL;
323 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
324 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
325 crtc->enabled = drm_helper_crtc_in_use(crtc);
326 if (!crtc->enabled) {
327 if (crtc_funcs->disable)
328 (*crtc_funcs->disable)(crtc);
330 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
335 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
338 * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
339 * @encoder: encoder to test
340 * @crtc: crtc to test
342 * Return false if @encoder can't be driven by @crtc, true otherwise.
344 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
345 struct drm_crtc *crtc)
347 struct drm_device *dev;
348 struct drm_crtc *tmp;
351 WARN(!crtc, "checking null crtc?\n");
355 list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
361 if (encoder->possible_crtcs & crtc_mask)
367 * Check the CRTC we're going to map each output to vs. its current
368 * CRTC. If they don't match, we have to disable the output and the CRTC
369 * since the driver will have to re-route things.
372 drm_crtc_prepare_encoders(struct drm_device *dev)
374 struct drm_encoder_helper_funcs *encoder_funcs;
375 struct drm_encoder *encoder;
377 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
378 encoder_funcs = encoder->helper_private;
379 /* Disable unused encoders */
380 if (encoder->crtc == NULL)
381 drm_encoder_disable(encoder);
382 /* Disable encoders whose CRTC is about to change */
383 if (encoder_funcs->get_crtc &&
384 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
385 drm_encoder_disable(encoder);
390 * drm_crtc_helper_set_mode - internal helper to set a mode
391 * @crtc: CRTC to program
393 * @x: horizontal offset into the surface
394 * @y: vertical offset into the surface
395 * @old_fb: old framebuffer, for cleanup
398 * Caller must hold mode config lock.
400 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
401 * to fixup or reject the mode prior to trying to set it. This is an internal
402 * helper that drivers could e.g. use to update properties that require the
403 * entire output pipe to be disabled and re-enabled in a new configuration. For
404 * example for changing whether audio is enabled on a hdmi link or for changing
405 * panel fitter or dither attributes. It is also called by the
406 * drm_crtc_helper_set_config() helper function to drive the mode setting
410 * True if the mode was set successfully, or false otherwise.
412 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
413 struct drm_display_mode *mode,
415 struct drm_framebuffer *old_fb)
417 struct drm_device *dev = crtc->dev;
418 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
419 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
420 struct drm_encoder_helper_funcs *encoder_funcs;
421 int saved_x, saved_y;
422 struct drm_encoder *encoder;
425 crtc->enabled = drm_helper_crtc_in_use(crtc);
429 adjusted_mode = drm_mode_duplicate(dev, mode);
433 saved_hwmode = crtc->hwmode;
434 saved_mode = crtc->mode;
438 /* Update crtc values up front so the driver can rely on them for mode
445 /* Pass our mode to the connectors and the CRTC to give them a chance to
446 * adjust it according to limitations or connector properties, and also
447 * a chance to reject the mode entirely.
449 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
451 if (encoder->crtc != crtc)
453 encoder_funcs = encoder->helper_private;
454 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
456 DRM_DEBUG_KMS("Encoder fixup failed\n");
461 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
462 DRM_DEBUG_KMS("CRTC fixup failed\n");
465 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
467 /* Prepare the encoders and CRTCs before setting the mode. */
468 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
470 if (encoder->crtc != crtc)
472 encoder_funcs = encoder->helper_private;
473 /* Disable the encoders as the first thing we do. */
474 encoder_funcs->prepare(encoder);
477 drm_crtc_prepare_encoders(dev);
479 crtc_funcs->prepare(crtc);
481 /* Set up the DPLL and any encoders state that needs to adjust or depend
484 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
488 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
490 if (encoder->crtc != crtc)
493 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
494 encoder->base.id, drm_get_encoder_name(encoder),
495 mode->base.id, mode->name);
496 encoder_funcs = encoder->helper_private;
497 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
500 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
501 crtc_funcs->commit(crtc);
503 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
505 if (encoder->crtc != crtc)
508 encoder_funcs = encoder->helper_private;
509 encoder_funcs->commit(encoder);
513 /* Store real post-adjustment hardware mode. */
514 crtc->hwmode = *adjusted_mode;
516 /* Calculate and store various constants which
517 * are later needed by vblank and swap-completion
518 * timestamping. They are derived from true hwmode.
520 drm_calc_timestamping_constants(crtc);
522 /* FIXME: add subpixel order */
524 drm_mode_destroy(dev, adjusted_mode);
526 crtc->hwmode = saved_hwmode;
527 crtc->mode = saved_mode;
534 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
538 drm_crtc_helper_disable(struct drm_crtc *crtc)
540 struct drm_device *dev = crtc->dev;
541 struct drm_connector *connector;
542 struct drm_encoder *encoder;
544 /* Decouple all encoders and their attached connectors from this crtc */
545 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
546 if (encoder->crtc != crtc)
549 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
550 if (connector->encoder != encoder)
553 connector->encoder = NULL;
557 drm_helper_disable_unused_functions(dev);
562 * drm_crtc_helper_set_config - set a new config from userspace
563 * @set: mode set configuration
566 * Caller must hold mode config lock.
568 * Setup a new configuration, provided by the upper layers (either an ioctl call
569 * from userspace or internally e.g. from the fbdev suppport code) in @set, and
570 * enable it. This is the main helper functions for drivers that implement
571 * kernel mode setting with the crtc helper functions and the assorted
572 * ->prepare(), ->modeset() and ->commit() helper callbacks.
575 * Returns 0 on success, -ERRNO on failure.
577 int drm_crtc_helper_set_config(struct drm_mode_set *set)
579 struct drm_device *dev;
580 struct drm_crtc *save_crtcs, *new_crtc, *crtc;
581 struct drm_encoder *save_encoders, *new_encoder, *encoder;
582 struct drm_framebuffer *old_fb = NULL;
583 bool mode_changed = false; /* if true do a full mode set */
584 bool fb_changed = false; /* if true and !mode_changed just do a flip */
585 struct drm_connector *save_connectors, *connector;
586 int count = 0, ro, fail = 0;
587 struct drm_crtc_helper_funcs *crtc_funcs;
588 struct drm_mode_set save_set;
596 BUG_ON(!set->crtc->helper_private);
598 /* Enforce sane interface api - has been abused by the fb helper. */
599 BUG_ON(!set->mode && set->fb);
600 BUG_ON(set->fb && set->num_connectors == 0);
602 crtc_funcs = set->crtc->helper_private;
608 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
609 set->crtc->base.id, set->fb->base.id,
610 (int)set->num_connectors, set->x, set->y);
612 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
613 return drm_crtc_helper_disable(set->crtc);
616 dev = set->crtc->dev;
618 /* Allocate space for the backup of all (non-pointer) crtc, encoder and
620 save_crtcs = kzalloc(dev->mode_config.num_crtc *
621 sizeof(struct drm_crtc), GFP_KERNEL);
625 save_encoders = kzalloc(dev->mode_config.num_encoder *
626 sizeof(struct drm_encoder), GFP_KERNEL);
627 if (!save_encoders) {
632 save_connectors = kzalloc(dev->mode_config.num_connector *
633 sizeof(struct drm_connector), GFP_KERNEL);
634 if (!save_connectors) {
636 kfree(save_encoders);
640 /* Copy data. Note that driver private data is not affected.
641 * Should anything bad happen only the expected state is
642 * restored, not the drivers personal bookkeeping.
645 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
646 save_crtcs[count++] = *crtc;
650 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
651 save_encoders[count++] = *encoder;
655 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
656 save_connectors[count++] = *connector;
659 save_set.crtc = set->crtc;
660 save_set.mode = &set->crtc->mode;
661 save_set.x = set->crtc->x;
662 save_set.y = set->crtc->y;
663 save_set.fb = set->crtc->fb;
665 /* We should be able to check here if the fb has the same properties
666 * and then just flip_or_move it */
667 if (set->crtc->fb != set->fb) {
668 /* If we have no fb then treat it as a full mode set */
669 if (set->crtc->fb == NULL) {
670 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
672 } else if (set->fb == NULL) {
674 } else if (set->fb->pixel_format !=
675 set->crtc->fb->pixel_format) {
681 if (set->x != set->crtc->x || set->y != set->crtc->y)
684 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
685 DRM_DEBUG_KMS("modes are different, full mode set\n");
686 drm_mode_debug_printmodeline(&set->crtc->mode);
687 drm_mode_debug_printmodeline(set->mode);
691 /* a) traverse passed in connector list and get encoders for them */
693 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
694 struct drm_connector_helper_funcs *connector_funcs =
695 connector->helper_private;
696 new_encoder = connector->encoder;
697 for (ro = 0; ro < set->num_connectors; ro++) {
698 if (set->connectors[ro] == connector) {
699 new_encoder = connector_funcs->best_encoder(connector);
700 /* if we can't get an encoder for a connector
701 we are setting now - then fail */
702 if (new_encoder == NULL)
703 /* don't break so fail path works correct */
709 if (new_encoder != connector->encoder) {
710 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
712 /* If the encoder is reused for another connector, then
713 * the appropriate crtc will be set later.
715 if (connector->encoder)
716 connector->encoder->crtc = NULL;
717 connector->encoder = new_encoder;
727 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
728 if (!connector->encoder)
731 if (connector->encoder->crtc == set->crtc)
734 new_crtc = connector->encoder->crtc;
736 for (ro = 0; ro < set->num_connectors; ro++) {
737 if (set->connectors[ro] == connector)
738 new_crtc = set->crtc;
741 /* Make sure the new CRTC will work with the encoder */
743 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
747 if (new_crtc != connector->encoder->crtc) {
748 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
750 connector->encoder->crtc = new_crtc;
753 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
754 connector->base.id, drm_get_connector_name(connector),
757 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
758 connector->base.id, drm_get_connector_name(connector));
762 /* mode_set_base is not a required function */
763 if (fb_changed && !crtc_funcs->mode_set_base)
767 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
768 if (set->crtc->enabled) {
769 DRM_DEBUG_KMS("attempting to set mode from"
771 drm_mode_debug_printmodeline(set->mode);
772 old_fb = set->crtc->fb;
773 set->crtc->fb = set->fb;
774 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
777 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
779 set->crtc->fb = old_fb;
784 drm_helper_disable_unused_functions(dev);
785 } else if (fb_changed) {
786 set->crtc->x = set->x;
787 set->crtc->y = set->y;
789 old_fb = set->crtc->fb;
790 if (set->crtc->fb != set->fb)
791 set->crtc->fb = set->fb;
792 ret = crtc_funcs->mode_set_base(set->crtc,
793 set->x, set->y, old_fb);
795 set->crtc->fb = old_fb;
801 * crtc set_config helpers implicit set the crtc and all connected
802 * encoders to DPMS on for a full mode set. But for just an fb update it
803 * doesn't do that. To not confuse userspace, do an explicit DPMS_ON
804 * unconditionally. This will also ensure driver internal dpms state is
807 if (set->crtc->enabled) {
808 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
809 for (i = 0; i < set->num_connectors; i++) {
810 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
811 drm_get_connector_name(set->connectors[i]));
812 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
816 kfree(save_connectors);
817 kfree(save_encoders);
822 /* Restore all previous data. */
824 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
825 *crtc = save_crtcs[count++];
829 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
830 *encoder = save_encoders[count++];
834 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
835 *connector = save_connectors[count++];
838 /* Try to restore the config */
840 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
841 save_set.y, save_set.fb))
842 DRM_ERROR("failed to restore config after modeset failure\n");
844 kfree(save_connectors);
845 kfree(save_encoders);
849 EXPORT_SYMBOL(drm_crtc_helper_set_config);
851 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
853 int dpms = DRM_MODE_DPMS_OFF;
854 struct drm_connector *connector;
855 struct drm_device *dev = encoder->dev;
857 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
858 if (connector->encoder == encoder)
859 if (connector->dpms < dpms)
860 dpms = connector->dpms;
864 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
866 int dpms = DRM_MODE_DPMS_OFF;
867 struct drm_connector *connector;
868 struct drm_device *dev = crtc->dev;
870 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
871 if (connector->encoder && connector->encoder->crtc == crtc)
872 if (connector->dpms < dpms)
873 dpms = connector->dpms;
878 * drm_helper_connector_dpms() - connector dpms helper implementation
879 * @connector: affected connector
882 * This is the main helper function provided by the crtc helper framework for
883 * implementing the DPMS connector attribute. It computes the new desired DPMS
884 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
885 * callback provided by the driver appropriately.
887 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
889 struct drm_encoder *encoder = connector->encoder;
890 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
893 if (mode == connector->dpms)
896 old_dpms = connector->dpms;
897 connector->dpms = mode;
899 /* from off to on, do crtc then encoder */
900 if (mode < old_dpms) {
902 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
903 if (crtc_funcs->dpms)
904 (*crtc_funcs->dpms) (crtc,
905 drm_helper_choose_crtc_dpms(crtc));
908 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
909 if (encoder_funcs->dpms)
910 (*encoder_funcs->dpms) (encoder,
911 drm_helper_choose_encoder_dpms(encoder));
915 /* from on to off, do encoder then crtc */
916 if (mode > old_dpms) {
918 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
919 if (encoder_funcs->dpms)
920 (*encoder_funcs->dpms) (encoder,
921 drm_helper_choose_encoder_dpms(encoder));
924 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
925 if (crtc_funcs->dpms)
926 (*crtc_funcs->dpms) (crtc,
927 drm_helper_choose_crtc_dpms(crtc));
933 EXPORT_SYMBOL(drm_helper_connector_dpms);
935 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
936 struct drm_mode_fb_cmd2 *mode_cmd)
940 fb->width = mode_cmd->width;
941 fb->height = mode_cmd->height;
942 for (i = 0; i < 4; i++) {
943 fb->pitches[i] = mode_cmd->pitches[i];
944 fb->offsets[i] = mode_cmd->offsets[i];
946 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
947 &fb->bits_per_pixel);
948 fb->pixel_format = mode_cmd->pixel_format;
952 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
954 int drm_helper_resume_force_mode(struct drm_device *dev)
956 struct drm_crtc *crtc;
957 struct drm_encoder *encoder;
958 struct drm_encoder_helper_funcs *encoder_funcs;
959 struct drm_crtc_helper_funcs *crtc_funcs;
962 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
967 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
968 crtc->x, crtc->y, crtc->fb);
971 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
973 /* Turn off outputs that were already powered off */
974 if (drm_helper_choose_crtc_dpms(crtc)) {
975 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
977 if(encoder->crtc != crtc)
980 encoder_funcs = encoder->helper_private;
981 if (encoder_funcs->dpms)
982 (*encoder_funcs->dpms) (encoder,
983 drm_helper_choose_encoder_dpms(encoder));
986 crtc_funcs = crtc->helper_private;
987 if (crtc_funcs->dpms)
988 (*crtc_funcs->dpms) (crtc,
989 drm_helper_choose_crtc_dpms(crtc));
992 /* disable the unused connectors while restoring the modesetting */
993 drm_helper_disable_unused_functions(dev);
996 EXPORT_SYMBOL(drm_helper_resume_force_mode);
998 void drm_kms_helper_hotplug_event(struct drm_device *dev)
1000 /* send a uevent + call fbdev */
1001 drm_sysfs_hotplug_event(dev);
1002 if (dev->mode_config.funcs->output_poll_changed)
1003 dev->mode_config.funcs->output_poll_changed(dev);
1005 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
1007 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1008 static void output_poll_execute(struct work_struct *work)
1010 struct delayed_work *delayed_work = to_delayed_work(work);
1011 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
1012 struct drm_connector *connector;
1013 enum drm_connector_status old_status;
1014 bool repoll = false, changed;
1016 /* Pick up any changes detected by the probe functions. */
1017 changed = dev->mode_config.delayed_event;
1018 dev->mode_config.delayed_event = false;
1020 if (!drm_kms_helper_poll)
1023 mutex_lock(&dev->mode_config.mutex);
1024 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1026 /* Ignore forced connectors. */
1027 if (connector->force)
1030 /* Ignore HPD capable connectors and connectors where we don't
1031 * want any hotplug detection at all for polling. */
1032 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
1037 old_status = connector->status;
1038 /* if we are connected and don't want to poll for disconnect
1040 if (old_status == connector_status_connected &&
1041 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1044 connector->status = connector->funcs->detect(connector, false);
1045 if (old_status != connector->status) {
1046 const char *old, *new;
1048 old = drm_get_connector_status_name(old_status);
1049 new = drm_get_connector_status_name(connector->status);
1051 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1052 "status updated from %s to %s\n",
1054 drm_get_connector_name(connector),
1061 mutex_unlock(&dev->mode_config.mutex);
1064 drm_kms_helper_hotplug_event(dev);
1067 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1070 void drm_kms_helper_poll_disable(struct drm_device *dev)
1072 if (!dev->mode_config.poll_enabled)
1074 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1076 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1078 void drm_kms_helper_poll_enable(struct drm_device *dev)
1081 struct drm_connector *connector;
1083 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1086 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1087 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1088 DRM_CONNECTOR_POLL_DISCONNECT))
1093 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1095 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1097 void drm_kms_helper_poll_init(struct drm_device *dev)
1099 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1100 dev->mode_config.poll_enabled = true;
1102 drm_kms_helper_poll_enable(dev);
1104 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1106 void drm_kms_helper_poll_fini(struct drm_device *dev)
1108 drm_kms_helper_poll_disable(dev);
1110 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1112 void drm_helper_hpd_irq_event(struct drm_device *dev)
1114 struct drm_connector *connector;
1115 enum drm_connector_status old_status;
1116 bool changed = false;
1118 if (!dev->mode_config.poll_enabled)
1121 mutex_lock(&dev->mode_config.mutex);
1122 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1124 /* Only handle HPD capable connectors. */
1125 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1128 old_status = connector->status;
1130 connector->status = connector->funcs->detect(connector, false);
1131 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1133 drm_get_connector_name(connector),
1134 drm_get_connector_status_name(old_status),
1135 drm_get_connector_status_name(connector->status));
1136 if (old_status != connector->status)
1140 mutex_unlock(&dev->mode_config.mutex);
1143 drm_kms_helper_hotplug_event(dev);
1145 EXPORT_SYMBOL(drm_helper_hpd_irq_event);