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
109 * Caller must hold mode config lock.
111 * Based on the helper callbacks implemented by @connector try to detect all
112 * valid modes. Modes will first be added to the connector's probed_modes list,
113 * then culled (based on validity and the @maxX, @maxY parameters) and put into
114 * the normal modes list.
116 * Intended to be use as a generic implementation of the ->fill_modes()
117 * @connector vfunc for drivers that use the crtc helpers for output mode
118 * filtering and detection.
121 * Number of modes found on @connector.
123 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
124 uint32_t maxX, uint32_t maxY)
126 struct drm_device *dev = connector->dev;
127 struct drm_display_mode *mode;
128 struct drm_connector_helper_funcs *connector_funcs =
129 connector->helper_private;
132 bool verbose_prune = true;
134 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
135 drm_get_connector_name(connector));
136 /* set all modes to the unverified state */
137 list_for_each_entry(mode, &connector->modes, head)
138 mode->status = MODE_UNVERIFIED;
140 if (connector->force) {
141 if (connector->force == DRM_FORCE_ON)
142 connector->status = connector_status_connected;
144 connector->status = connector_status_disconnected;
145 if (connector->funcs->force)
146 connector->funcs->force(connector);
148 connector->status = connector->funcs->detect(connector, true);
151 /* Re-enable polling in case the global poll config changed. */
152 if (drm_kms_helper_poll != dev->mode_config.poll_running)
153 drm_kms_helper_poll_enable(dev);
155 dev->mode_config.poll_running = drm_kms_helper_poll;
157 if (connector->status == connector_status_disconnected) {
158 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
159 connector->base.id, drm_get_connector_name(connector));
160 drm_mode_connector_update_edid_property(connector, NULL);
161 verbose_prune = false;
165 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
166 count = drm_load_edid_firmware(connector);
169 count = (*connector_funcs->get_modes)(connector);
171 if (count == 0 && connector->status == connector_status_connected)
172 count = drm_add_modes_noedid(connector, 1024, 768);
176 drm_mode_connector_list_update(connector);
179 drm_mode_validate_size(dev, &connector->modes, maxX,
182 if (connector->interlace_allowed)
183 mode_flags |= DRM_MODE_FLAG_INTERLACE;
184 if (connector->doublescan_allowed)
185 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
186 if (connector->stereo_allowed)
187 mode_flags |= DRM_MODE_FLAG_3D_MASK;
188 drm_mode_validate_flag(connector, mode_flags);
190 list_for_each_entry(mode, &connector->modes, head) {
191 if (mode->status == MODE_OK)
192 mode->status = connector_funcs->mode_valid(connector,
197 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
199 if (list_empty(&connector->modes))
202 list_for_each_entry(mode, &connector->modes, head)
203 mode->vrefresh = drm_mode_vrefresh(mode);
205 drm_mode_sort(&connector->modes);
207 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
208 drm_get_connector_name(connector));
209 list_for_each_entry(mode, &connector->modes, head) {
210 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
211 drm_mode_debug_printmodeline(mode);
216 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
219 * drm_helper_encoder_in_use - check if a given encoder is in use
220 * @encoder: encoder to check
223 * Caller must hold mode config lock.
225 * Walk @encoders's DRM device's mode_config and see if it's in use.
228 * True if @encoder is part of the mode_config, false otherwise.
230 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
232 struct drm_connector *connector;
233 struct drm_device *dev = encoder->dev;
234 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
235 if (connector->encoder == encoder)
239 EXPORT_SYMBOL(drm_helper_encoder_in_use);
242 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
243 * @crtc: CRTC to check
246 * Caller must hold mode config lock.
248 * Walk @crtc's DRM device's mode_config and see if it's in use.
251 * True if @crtc is part of the mode_config, false otherwise.
253 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
255 struct drm_encoder *encoder;
256 struct drm_device *dev = crtc->dev;
257 /* FIXME: Locking around list access? */
258 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
259 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
263 EXPORT_SYMBOL(drm_helper_crtc_in_use);
266 drm_encoder_disable(struct drm_encoder *encoder)
268 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
271 encoder->bridge->funcs->disable(encoder->bridge);
273 if (encoder_funcs->disable)
274 (*encoder_funcs->disable)(encoder);
276 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
279 encoder->bridge->funcs->post_disable(encoder->bridge);
283 * drm_helper_disable_unused_functions - disable unused objects
287 * Caller must hold mode config lock.
289 * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
290 * by calling its dpms function, which should power it off.
292 void drm_helper_disable_unused_functions(struct drm_device *dev)
294 struct drm_encoder *encoder;
295 struct drm_connector *connector;
296 struct drm_crtc *crtc;
298 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
299 if (!connector->encoder)
301 if (connector->status == connector_status_disconnected)
302 connector->encoder = NULL;
305 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
306 if (!drm_helper_encoder_in_use(encoder)) {
307 drm_encoder_disable(encoder);
308 /* disconnector encoder from any connector */
309 encoder->crtc = NULL;
313 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
314 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
315 crtc->enabled = drm_helper_crtc_in_use(crtc);
316 if (!crtc->enabled) {
317 if (crtc_funcs->disable)
318 (*crtc_funcs->disable)(crtc);
320 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
325 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
328 * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
329 * @encoder: encoder to test
330 * @crtc: crtc to test
332 * Return false if @encoder can't be driven by @crtc, true otherwise.
334 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
335 struct drm_crtc *crtc)
337 struct drm_device *dev;
338 struct drm_crtc *tmp;
341 WARN(!crtc, "checking null crtc?\n");
345 list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
351 if (encoder->possible_crtcs & crtc_mask)
357 * Check the CRTC we're going to map each output to vs. its current
358 * CRTC. If they don't match, we have to disable the output and the CRTC
359 * since the driver will have to re-route things.
362 drm_crtc_prepare_encoders(struct drm_device *dev)
364 struct drm_encoder_helper_funcs *encoder_funcs;
365 struct drm_encoder *encoder;
367 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
368 encoder_funcs = encoder->helper_private;
369 /* Disable unused encoders */
370 if (encoder->crtc == NULL)
371 drm_encoder_disable(encoder);
372 /* Disable encoders whose CRTC is about to change */
373 if (encoder_funcs->get_crtc &&
374 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
375 drm_encoder_disable(encoder);
380 * drm_crtc_helper_set_mode - internal helper to set a mode
381 * @crtc: CRTC to program
383 * @x: horizontal offset into the surface
384 * @y: vertical offset into the surface
385 * @old_fb: old framebuffer, for cleanup
388 * Caller must hold mode config lock.
390 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
391 * to fixup or reject the mode prior to trying to set it. This is an internal
392 * helper that drivers could e.g. use to update properties that require the
393 * entire output pipe to be disabled and re-enabled in a new configuration. For
394 * example for changing whether audio is enabled on a hdmi link or for changing
395 * panel fitter or dither attributes. It is also called by the
396 * drm_crtc_helper_set_config() helper function to drive the mode setting
400 * True if the mode was set successfully, or false otherwise.
402 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
403 struct drm_display_mode *mode,
405 struct drm_framebuffer *old_fb)
407 struct drm_device *dev = crtc->dev;
408 struct drm_display_mode *adjusted_mode, saved_mode;
409 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
410 struct drm_encoder_helper_funcs *encoder_funcs;
411 int saved_x, saved_y;
413 struct drm_encoder *encoder;
416 saved_enabled = crtc->enabled;
417 crtc->enabled = drm_helper_crtc_in_use(crtc);
421 adjusted_mode = drm_mode_duplicate(dev, mode);
422 if (!adjusted_mode) {
423 crtc->enabled = saved_enabled;
427 saved_mode = crtc->mode;
431 /* Update crtc values up front so the driver can rely on them for mode
438 /* Pass our mode to the connectors and the CRTC to give them a chance to
439 * adjust it according to limitations or connector properties, and also
440 * a chance to reject the mode entirely.
442 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
444 if (encoder->crtc != crtc)
447 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
448 ret = encoder->bridge->funcs->mode_fixup(
449 encoder->bridge, mode, adjusted_mode);
451 DRM_DEBUG_KMS("Bridge fixup failed\n");
456 encoder_funcs = encoder->helper_private;
457 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
459 DRM_DEBUG_KMS("Encoder fixup failed\n");
464 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
465 DRM_DEBUG_KMS("CRTC fixup failed\n");
468 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
470 /* Prepare the encoders and CRTCs before setting the mode. */
471 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
473 if (encoder->crtc != crtc)
477 encoder->bridge->funcs->disable(encoder->bridge);
479 encoder_funcs = encoder->helper_private;
480 /* Disable the encoders as the first thing we do. */
481 encoder_funcs->prepare(encoder);
484 encoder->bridge->funcs->post_disable(encoder->bridge);
487 drm_crtc_prepare_encoders(dev);
489 crtc_funcs->prepare(crtc);
491 /* Set up the DPLL and any encoders state that needs to adjust or depend
494 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
498 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
500 if (encoder->crtc != crtc)
503 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
504 encoder->base.id, drm_get_encoder_name(encoder),
505 mode->base.id, mode->name);
506 encoder_funcs = encoder->helper_private;
507 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
509 if (encoder->bridge && encoder->bridge->funcs->mode_set)
510 encoder->bridge->funcs->mode_set(encoder->bridge, mode,
514 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
515 crtc_funcs->commit(crtc);
517 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
519 if (encoder->crtc != crtc)
523 encoder->bridge->funcs->pre_enable(encoder->bridge);
525 encoder_funcs = encoder->helper_private;
526 encoder_funcs->commit(encoder);
529 encoder->bridge->funcs->enable(encoder->bridge);
532 /* Store real post-adjustment hardware mode. */
533 crtc->hwmode = *adjusted_mode;
535 /* Calculate and store various constants which
536 * are later needed by vblank and swap-completion
537 * timestamping. They are derived from true hwmode.
539 drm_calc_timestamping_constants(crtc);
541 /* FIXME: add subpixel order */
543 drm_mode_destroy(dev, adjusted_mode);
545 crtc->enabled = saved_enabled;
546 crtc->mode = saved_mode;
553 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
557 drm_crtc_helper_disable(struct drm_crtc *crtc)
559 struct drm_device *dev = crtc->dev;
560 struct drm_connector *connector;
561 struct drm_encoder *encoder;
563 /* Decouple all encoders and their attached connectors from this crtc */
564 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
565 if (encoder->crtc != crtc)
568 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
569 if (connector->encoder != encoder)
572 connector->encoder = NULL;
575 * drm_helper_disable_unused_functions() ought to be
576 * doing this, but since we've decoupled the encoder
577 * from the connector above, the required connection
578 * between them is henceforth no longer available.
580 connector->dpms = DRM_MODE_DPMS_OFF;
584 drm_helper_disable_unused_functions(dev);
589 * drm_crtc_helper_set_config - set a new config from userspace
590 * @set: mode set configuration
593 * Caller must hold mode config lock.
595 * Setup a new configuration, provided by the upper layers (either an ioctl call
596 * from userspace or internally e.g. from the fbdev suppport code) in @set, and
597 * enable it. This is the main helper functions for drivers that implement
598 * kernel mode setting with the crtc helper functions and the assorted
599 * ->prepare(), ->modeset() and ->commit() helper callbacks.
602 * Returns 0 on success, -ERRNO on failure.
604 int drm_crtc_helper_set_config(struct drm_mode_set *set)
606 struct drm_device *dev;
607 struct drm_crtc *new_crtc;
608 struct drm_encoder *save_encoders, *new_encoder, *encoder;
609 bool mode_changed = false; /* if true do a full mode set */
610 bool fb_changed = false; /* if true and !mode_changed just do a flip */
611 struct drm_connector *save_connectors, *connector;
612 int count = 0, ro, fail = 0;
613 struct drm_crtc_helper_funcs *crtc_funcs;
614 struct drm_mode_set save_set;
622 BUG_ON(!set->crtc->helper_private);
624 /* Enforce sane interface api - has been abused by the fb helper. */
625 BUG_ON(!set->mode && set->fb);
626 BUG_ON(set->fb && set->num_connectors == 0);
628 crtc_funcs = set->crtc->helper_private;
634 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
635 set->crtc->base.id, set->fb->base.id,
636 (int)set->num_connectors, set->x, set->y);
638 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
639 return drm_crtc_helper_disable(set->crtc);
642 dev = set->crtc->dev;
645 * Allocate space for the backup of all (non-pointer) encoder and
648 save_encoders = kzalloc(dev->mode_config.num_encoder *
649 sizeof(struct drm_encoder), GFP_KERNEL);
653 save_connectors = kzalloc(dev->mode_config.num_connector *
654 sizeof(struct drm_connector), GFP_KERNEL);
655 if (!save_connectors) {
656 kfree(save_encoders);
661 * Copy data. Note that driver private data is not affected.
662 * Should anything bad happen only the expected state is
663 * restored, not the drivers personal bookkeeping.
666 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
667 save_encoders[count++] = *encoder;
671 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
672 save_connectors[count++] = *connector;
675 save_set.crtc = set->crtc;
676 save_set.mode = &set->crtc->mode;
677 save_set.x = set->crtc->x;
678 save_set.y = set->crtc->y;
679 save_set.fb = set->crtc->fb;
681 /* We should be able to check here if the fb has the same properties
682 * and then just flip_or_move it */
683 if (set->crtc->fb != set->fb) {
684 /* If we have no fb then treat it as a full mode set */
685 if (set->crtc->fb == NULL) {
686 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
688 } else if (set->fb == NULL) {
690 } else if (set->fb->pixel_format !=
691 set->crtc->fb->pixel_format) {
697 if (set->x != set->crtc->x || set->y != set->crtc->y)
700 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
701 DRM_DEBUG_KMS("modes are different, full mode set\n");
702 drm_mode_debug_printmodeline(&set->crtc->mode);
703 drm_mode_debug_printmodeline(set->mode);
707 /* a) traverse passed in connector list and get encoders for them */
709 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
710 struct drm_connector_helper_funcs *connector_funcs =
711 connector->helper_private;
712 new_encoder = connector->encoder;
713 for (ro = 0; ro < set->num_connectors; ro++) {
714 if (set->connectors[ro] == connector) {
715 new_encoder = connector_funcs->best_encoder(connector);
716 /* if we can't get an encoder for a connector
717 we are setting now - then fail */
718 if (new_encoder == NULL)
719 /* don't break so fail path works correct */
723 if (connector->dpms != DRM_MODE_DPMS_ON) {
724 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
730 if (new_encoder != connector->encoder) {
731 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
733 /* If the encoder is reused for another connector, then
734 * the appropriate crtc will be set later.
736 if (connector->encoder)
737 connector->encoder->crtc = NULL;
738 connector->encoder = new_encoder;
748 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
749 if (!connector->encoder)
752 if (connector->encoder->crtc == set->crtc)
755 new_crtc = connector->encoder->crtc;
757 for (ro = 0; ro < set->num_connectors; ro++) {
758 if (set->connectors[ro] == connector)
759 new_crtc = set->crtc;
762 /* Make sure the new CRTC will work with the encoder */
764 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
768 if (new_crtc != connector->encoder->crtc) {
769 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
771 connector->encoder->crtc = new_crtc;
774 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
775 connector->base.id, drm_get_connector_name(connector),
778 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
779 connector->base.id, drm_get_connector_name(connector));
783 /* mode_set_base is not a required function */
784 if (fb_changed && !crtc_funcs->mode_set_base)
788 if (drm_helper_crtc_in_use(set->crtc)) {
789 DRM_DEBUG_KMS("attempting to set mode from"
791 drm_mode_debug_printmodeline(set->mode);
792 set->crtc->fb = set->fb;
793 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
796 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
798 set->crtc->fb = save_set.fb;
802 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
803 for (i = 0; i < set->num_connectors; i++) {
804 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
805 drm_get_connector_name(set->connectors[i]));
806 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
809 drm_helper_disable_unused_functions(dev);
810 } else if (fb_changed) {
811 set->crtc->x = set->x;
812 set->crtc->y = set->y;
813 set->crtc->fb = set->fb;
814 ret = crtc_funcs->mode_set_base(set->crtc,
815 set->x, set->y, save_set.fb);
817 set->crtc->x = save_set.x;
818 set->crtc->y = save_set.y;
819 set->crtc->fb = save_set.fb;
824 kfree(save_connectors);
825 kfree(save_encoders);
829 /* Restore all previous data. */
831 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
832 *encoder = save_encoders[count++];
836 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
837 *connector = save_connectors[count++];
840 /* Try to restore the config */
842 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
843 save_set.y, save_set.fb))
844 DRM_ERROR("failed to restore config after modeset failure\n");
846 kfree(save_connectors);
847 kfree(save_encoders);
850 EXPORT_SYMBOL(drm_crtc_helper_set_config);
852 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
854 int dpms = DRM_MODE_DPMS_OFF;
855 struct drm_connector *connector;
856 struct drm_device *dev = encoder->dev;
858 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
859 if (connector->encoder == encoder)
860 if (connector->dpms < dpms)
861 dpms = connector->dpms;
865 /* Helper which handles bridge ordering around encoder dpms */
866 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
868 struct drm_bridge *bridge = encoder->bridge;
869 struct drm_encoder_helper_funcs *encoder_funcs;
872 if (mode == DRM_MODE_DPMS_ON)
873 bridge->funcs->pre_enable(bridge);
875 bridge->funcs->disable(bridge);
878 encoder_funcs = encoder->helper_private;
879 if (encoder_funcs->dpms)
880 encoder_funcs->dpms(encoder, mode);
883 if (mode == DRM_MODE_DPMS_ON)
884 bridge->funcs->enable(bridge);
886 bridge->funcs->post_disable(bridge);
890 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
892 int dpms = DRM_MODE_DPMS_OFF;
893 struct drm_connector *connector;
894 struct drm_device *dev = crtc->dev;
896 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
897 if (connector->encoder && connector->encoder->crtc == crtc)
898 if (connector->dpms < dpms)
899 dpms = connector->dpms;
904 * drm_helper_connector_dpms() - connector dpms helper implementation
905 * @connector: affected connector
908 * This is the main helper function provided by the crtc helper framework for
909 * implementing the DPMS connector attribute. It computes the new desired DPMS
910 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
911 * callback provided by the driver appropriately.
913 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
915 struct drm_encoder *encoder = connector->encoder;
916 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
917 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
919 if (mode == connector->dpms)
922 old_dpms = connector->dpms;
923 connector->dpms = mode;
926 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
928 /* from off to on, do crtc then encoder */
929 if (mode < old_dpms) {
931 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
932 if (crtc_funcs->dpms)
933 (*crtc_funcs->dpms) (crtc,
934 drm_helper_choose_crtc_dpms(crtc));
937 drm_helper_encoder_dpms(encoder, encoder_dpms);
940 /* from on to off, do encoder then crtc */
941 if (mode > old_dpms) {
943 drm_helper_encoder_dpms(encoder, encoder_dpms);
945 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
946 if (crtc_funcs->dpms)
947 (*crtc_funcs->dpms) (crtc,
948 drm_helper_choose_crtc_dpms(crtc));
954 EXPORT_SYMBOL(drm_helper_connector_dpms);
956 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
957 struct drm_mode_fb_cmd2 *mode_cmd)
961 fb->width = mode_cmd->width;
962 fb->height = mode_cmd->height;
963 for (i = 0; i < 4; i++) {
964 fb->pitches[i] = mode_cmd->pitches[i];
965 fb->offsets[i] = mode_cmd->offsets[i];
967 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
968 &fb->bits_per_pixel);
969 fb->pixel_format = mode_cmd->pixel_format;
973 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
975 int drm_helper_resume_force_mode(struct drm_device *dev)
977 struct drm_crtc *crtc;
978 struct drm_encoder *encoder;
979 struct drm_crtc_helper_funcs *crtc_funcs;
980 int ret, encoder_dpms;
982 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
987 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
988 crtc->x, crtc->y, crtc->fb);
991 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
993 /* Turn off outputs that were already powered off */
994 if (drm_helper_choose_crtc_dpms(crtc)) {
995 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
997 if(encoder->crtc != crtc)
1000 encoder_dpms = drm_helper_choose_encoder_dpms(
1003 drm_helper_encoder_dpms(encoder, encoder_dpms);
1006 crtc_funcs = crtc->helper_private;
1007 if (crtc_funcs->dpms)
1008 (*crtc_funcs->dpms) (crtc,
1009 drm_helper_choose_crtc_dpms(crtc));
1012 /* disable the unused connectors while restoring the modesetting */
1013 drm_helper_disable_unused_functions(dev);
1016 EXPORT_SYMBOL(drm_helper_resume_force_mode);
1018 void drm_kms_helper_hotplug_event(struct drm_device *dev)
1020 /* send a uevent + call fbdev */
1021 drm_sysfs_hotplug_event(dev);
1022 if (dev->mode_config.funcs->output_poll_changed)
1023 dev->mode_config.funcs->output_poll_changed(dev);
1025 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
1027 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1028 static void output_poll_execute(struct work_struct *work)
1030 struct delayed_work *delayed_work = to_delayed_work(work);
1031 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
1032 struct drm_connector *connector;
1033 enum drm_connector_status old_status;
1034 bool repoll = false, changed = false;
1036 if (!drm_kms_helper_poll)
1039 mutex_lock(&dev->mode_config.mutex);
1040 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1042 /* Ignore forced connectors. */
1043 if (connector->force)
1046 /* Ignore HPD capable connectors and connectors where we don't
1047 * want any hotplug detection at all for polling. */
1048 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
1053 old_status = connector->status;
1054 /* if we are connected and don't want to poll for disconnect
1056 if (old_status == connector_status_connected &&
1057 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1060 connector->status = connector->funcs->detect(connector, false);
1061 if (old_status != connector->status) {
1062 const char *old, *new;
1064 old = drm_get_connector_status_name(old_status);
1065 new = drm_get_connector_status_name(connector->status);
1067 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1068 "status updated from %s to %s\n",
1070 drm_get_connector_name(connector),
1077 mutex_unlock(&dev->mode_config.mutex);
1080 drm_kms_helper_hotplug_event(dev);
1083 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1086 void drm_kms_helper_poll_disable(struct drm_device *dev)
1088 if (!dev->mode_config.poll_enabled)
1090 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1092 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1094 void drm_kms_helper_poll_enable(struct drm_device *dev)
1097 struct drm_connector *connector;
1099 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1102 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1103 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1104 DRM_CONNECTOR_POLL_DISCONNECT))
1109 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1111 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1113 void drm_kms_helper_poll_init(struct drm_device *dev)
1115 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1116 dev->mode_config.poll_enabled = true;
1118 drm_kms_helper_poll_enable(dev);
1120 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1122 void drm_kms_helper_poll_fini(struct drm_device *dev)
1124 drm_kms_helper_poll_disable(dev);
1126 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1128 bool drm_helper_hpd_irq_event(struct drm_device *dev)
1130 struct drm_connector *connector;
1131 enum drm_connector_status old_status;
1132 bool changed = false;
1134 if (!dev->mode_config.poll_enabled)
1137 mutex_lock(&dev->mode_config.mutex);
1138 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1140 /* Only handle HPD capable connectors. */
1141 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1144 old_status = connector->status;
1146 connector->status = connector->funcs->detect(connector, false);
1147 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1149 drm_get_connector_name(connector),
1150 drm_get_connector_status_name(old_status),
1151 drm_get_connector_status_name(connector->status));
1152 if (old_status != connector->status)
1156 mutex_unlock(&dev->mode_config.mutex);
1159 drm_kms_helper_hotplug_event(dev);
1163 EXPORT_SYMBOL(drm_helper_hpd_irq_event);