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/kernel.h>
33 #include <linux/export.h>
34 #include <linux/moduleparam.h>
37 #include <drm/drm_atomic.h>
38 #include <drm/drm_atomic_uapi.h>
39 #include <drm/drm_crtc.h>
40 #include <drm/drm_encoder.h>
41 #include <drm/drm_fourcc.h>
42 #include <drm/drm_crtc_helper.h>
43 #include <drm/drm_fb_helper.h>
44 #include <drm/drm_plane_helper.h>
45 #include <drm/drm_atomic_helper.h>
46 #include <drm/drm_edid.h>
51 * The CRTC modeset helper library provides a default set_config implementation
52 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
53 * the same callbacks which drivers can use to e.g. restore the modeset
54 * configuration on resume with drm_helper_resume_force_mode().
56 * Note that this helper library doesn't track the current power state of CRTCs
57 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even
58 * though the hardware is already in the desired state. This deficiency has been
59 * fixed in the atomic helpers.
61 * The driver callbacks are mostly compatible with the atomic modeset helpers,
62 * except for the handling of the primary plane: Atomic helpers require that the
63 * primary plane is implemented as a real standalone plane and not directly tied
64 * to the CRTC state. For easier transition this library provides functions to
65 * implement the old semantics required by the CRTC helpers using the new plane
66 * and atomic helper callbacks.
68 * Drivers are strongly urged to convert to the atomic helpers (by way of first
69 * converting to the plane helpers). New drivers must not use these functions
70 * but need to implement the atomic interface instead, potentially using the
71 * atomic helpers for that.
73 * These legacy modeset helpers use the same function table structures as
74 * all other modesetting helpers. See the documentation for struct
75 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct
76 * &drm_connector_helper_funcs.
80 * drm_helper_encoder_in_use - check if a given encoder is in use
81 * @encoder: encoder to check
83 * Checks whether @encoder is with the current mode setting output configuration
84 * in use by any connector. This doesn't mean that it is actually enabled since
85 * the DPMS state is tracked separately.
88 * True if @encoder is used, false otherwise.
90 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
92 struct drm_connector *connector;
93 struct drm_connector_list_iter conn_iter;
94 struct drm_device *dev = encoder->dev;
96 WARN_ON(drm_drv_uses_atomic_modeset(dev));
99 * We can expect this mutex to be locked if we are not panicking.
100 * Locking is currently fubar in the panic handler.
102 if (!oops_in_progress) {
103 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
104 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
108 drm_connector_list_iter_begin(dev, &conn_iter);
109 drm_for_each_connector_iter(connector, &conn_iter) {
110 if (connector->encoder == encoder) {
111 drm_connector_list_iter_end(&conn_iter);
115 drm_connector_list_iter_end(&conn_iter);
118 EXPORT_SYMBOL(drm_helper_encoder_in_use);
121 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
122 * @crtc: CRTC to check
124 * Checks whether @crtc is with the current mode setting output configuration
125 * in use by any connector. This doesn't mean that it is actually enabled since
126 * the DPMS state is tracked separately.
129 * True if @crtc is used, false otherwise.
131 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
133 struct drm_encoder *encoder;
134 struct drm_device *dev = crtc->dev;
136 WARN_ON(drm_drv_uses_atomic_modeset(dev));
139 * We can expect this mutex to be locked if we are not panicking.
140 * Locking is currently fubar in the panic handler.
142 if (!oops_in_progress)
143 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
145 drm_for_each_encoder(encoder, dev)
146 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
150 EXPORT_SYMBOL(drm_helper_crtc_in_use);
153 drm_encoder_disable(struct drm_encoder *encoder)
155 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
160 drm_bridge_disable(encoder->bridge);
162 if (encoder_funcs->disable)
163 (*encoder_funcs->disable)(encoder);
164 else if (encoder_funcs->dpms)
165 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
167 drm_bridge_post_disable(encoder->bridge);
170 static void __drm_helper_disable_unused_functions(struct drm_device *dev)
172 struct drm_encoder *encoder;
173 struct drm_crtc *crtc;
175 drm_warn_on_modeset_not_all_locked(dev);
177 drm_for_each_encoder(encoder, dev) {
178 if (!drm_helper_encoder_in_use(encoder)) {
179 drm_encoder_disable(encoder);
180 /* disconnect encoder from any connector */
181 encoder->crtc = NULL;
185 drm_for_each_crtc(crtc, dev) {
186 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
187 crtc->enabled = drm_helper_crtc_in_use(crtc);
188 if (!crtc->enabled) {
189 if (crtc_funcs->disable)
190 (*crtc_funcs->disable)(crtc);
192 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
193 crtc->primary->fb = NULL;
199 * drm_helper_disable_unused_functions - disable unused objects
202 * This function walks through the entire mode setting configuration of @dev. It
203 * will remove any CRTC links of unused encoders and encoder links of
204 * disconnected connectors. Then it will disable all unused encoders and CRTCs
205 * either by calling their disable callback if available or by calling their
206 * dpms callback with DRM_MODE_DPMS_OFF.
210 * This function is part of the legacy modeset helper library and will cause
211 * major confusion with atomic drivers. This is because atomic helpers guarantee
212 * to never call ->disable() hooks on a disabled function, or ->enable() hooks
213 * on an enabled functions. drm_helper_disable_unused_functions() on the other
214 * hand throws such guarantees into the wind and calls disable hooks
215 * unconditionally on unused functions.
217 void drm_helper_disable_unused_functions(struct drm_device *dev)
219 WARN_ON(drm_drv_uses_atomic_modeset(dev));
221 drm_modeset_lock_all(dev);
222 __drm_helper_disable_unused_functions(dev);
223 drm_modeset_unlock_all(dev);
225 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
228 * Check the CRTC we're going to map each output to vs. its current
229 * CRTC. If they don't match, we have to disable the output and the CRTC
230 * since the driver will have to re-route things.
233 drm_crtc_prepare_encoders(struct drm_device *dev)
235 const struct drm_encoder_helper_funcs *encoder_funcs;
236 struct drm_encoder *encoder;
238 drm_for_each_encoder(encoder, dev) {
239 encoder_funcs = encoder->helper_private;
243 /* Disable unused encoders */
244 if (encoder->crtc == NULL)
245 drm_encoder_disable(encoder);
246 /* Disable encoders whose CRTC is about to change */
247 if (encoder_funcs->get_crtc &&
248 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
249 drm_encoder_disable(encoder);
254 * drm_crtc_helper_set_mode - internal helper to set a mode
255 * @crtc: CRTC to program
257 * @x: horizontal offset into the surface
258 * @y: vertical offset into the surface
259 * @old_fb: old framebuffer, for cleanup
261 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
262 * to fixup or reject the mode prior to trying to set it. This is an internal
263 * helper that drivers could e.g. use to update properties that require the
264 * entire output pipe to be disabled and re-enabled in a new configuration. For
265 * example for changing whether audio is enabled on a hdmi link or for changing
266 * panel fitter or dither attributes. It is also called by the
267 * drm_crtc_helper_set_config() helper function to drive the mode setting
271 * True if the mode was set successfully, false otherwise.
273 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
274 struct drm_display_mode *mode,
276 struct drm_framebuffer *old_fb)
278 struct drm_device *dev = crtc->dev;
279 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
280 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
281 const struct drm_encoder_helper_funcs *encoder_funcs;
282 int saved_x, saved_y;
284 struct drm_encoder *encoder;
287 WARN_ON(drm_drv_uses_atomic_modeset(dev));
289 drm_warn_on_modeset_not_all_locked(dev);
291 saved_enabled = crtc->enabled;
292 crtc->enabled = drm_helper_crtc_in_use(crtc);
296 adjusted_mode = drm_mode_duplicate(dev, mode);
297 if (!adjusted_mode) {
298 crtc->enabled = saved_enabled;
302 saved_mode = crtc->mode;
303 saved_hwmode = crtc->hwmode;
307 /* Update crtc values up front so the driver can rely on them for mode
314 /* Pass our mode to the connectors and the CRTC to give them a chance to
315 * adjust it according to limitations or connector properties, and also
316 * a chance to reject the mode entirely.
318 drm_for_each_encoder(encoder, dev) {
320 if (encoder->crtc != crtc)
323 encoder_funcs = encoder->helper_private;
327 ret = drm_bridge_mode_fixup(encoder->bridge,
328 mode, adjusted_mode);
330 DRM_DEBUG_KMS("Bridge fixup failed\n");
334 encoder_funcs = encoder->helper_private;
335 if (encoder_funcs->mode_fixup) {
336 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
338 DRM_DEBUG_KMS("Encoder fixup failed\n");
344 if (crtc_funcs->mode_fixup) {
345 if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
347 DRM_DEBUG_KMS("CRTC fixup failed\n");
351 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
353 crtc->hwmode = *adjusted_mode;
355 /* Prepare the encoders and CRTCs before setting the mode. */
356 drm_for_each_encoder(encoder, dev) {
358 if (encoder->crtc != crtc)
361 encoder_funcs = encoder->helper_private;
365 drm_bridge_disable(encoder->bridge);
367 /* Disable the encoders as the first thing we do. */
368 if (encoder_funcs->prepare)
369 encoder_funcs->prepare(encoder);
371 drm_bridge_post_disable(encoder->bridge);
374 drm_crtc_prepare_encoders(dev);
376 crtc_funcs->prepare(crtc);
378 /* Set up the DPLL and any encoders state that needs to adjust or depend
381 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
385 drm_for_each_encoder(encoder, dev) {
387 if (encoder->crtc != crtc)
390 encoder_funcs = encoder->helper_private;
394 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%s]\n",
395 encoder->base.id, encoder->name, mode->name);
396 if (encoder_funcs->mode_set)
397 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
399 drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
402 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
403 crtc_funcs->commit(crtc);
405 drm_for_each_encoder(encoder, dev) {
407 if (encoder->crtc != crtc)
410 encoder_funcs = encoder->helper_private;
414 drm_bridge_pre_enable(encoder->bridge);
416 if (encoder_funcs->commit)
417 encoder_funcs->commit(encoder);
419 drm_bridge_enable(encoder->bridge);
422 /* Calculate and store various constants which
423 * are later needed by vblank and swap-completion
424 * timestamping. They are derived from true hwmode.
426 drm_calc_timestamping_constants(crtc, &crtc->hwmode);
428 /* FIXME: add subpixel order */
430 drm_mode_destroy(dev, adjusted_mode);
432 crtc->enabled = saved_enabled;
433 crtc->mode = saved_mode;
434 crtc->hwmode = saved_hwmode;
441 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
444 drm_crtc_helper_disable(struct drm_crtc *crtc)
446 struct drm_device *dev = crtc->dev;
447 struct drm_connector *connector;
448 struct drm_encoder *encoder;
450 /* Decouple all encoders and their attached connectors from this crtc */
451 drm_for_each_encoder(encoder, dev) {
452 struct drm_connector_list_iter conn_iter;
454 if (encoder->crtc != crtc)
457 drm_connector_list_iter_begin(dev, &conn_iter);
458 drm_for_each_connector_iter(connector, &conn_iter) {
459 if (connector->encoder != encoder)
462 connector->encoder = NULL;
465 * drm_helper_disable_unused_functions() ought to be
466 * doing this, but since we've decoupled the encoder
467 * from the connector above, the required connection
468 * between them is henceforth no longer available.
470 connector->dpms = DRM_MODE_DPMS_OFF;
472 /* we keep a reference while the encoder is bound */
473 drm_connector_put(connector);
475 drm_connector_list_iter_end(&conn_iter);
478 __drm_helper_disable_unused_functions(dev);
482 * drm_crtc_helper_set_config - set a new config from userspace
483 * @set: mode set configuration
484 * @ctx: lock acquire context, not used here
486 * The drm_crtc_helper_set_config() helper function implements the of
487 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
490 * It first tries to locate the best encoder for each connector by calling the
491 * connector @drm_connector_helper_funcs.best_encoder helper operation.
493 * After locating the appropriate encoders, the helper function will call the
494 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
495 * or reject it completely in which case an error will be returned to the
496 * application. If the new configuration after mode adjustment is identical to
497 * the current configuration the helper function will return without performing
498 * any other operation.
500 * If the adjusted mode is identical to the current mode but changes to the
501 * frame buffer need to be applied, the drm_crtc_helper_set_config() function
502 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
504 * If the adjusted mode differs from the current mode, or if the
505 * ->mode_set_base() helper operation is not provided, the helper function
506 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
507 * and ->commit() CRTC and encoder helper operations, in that order.
508 * Alternatively it can also use the dpms and disable helper operations. For
509 * details see &struct drm_crtc_helper_funcs and struct
510 * &drm_encoder_helper_funcs.
512 * This function is deprecated. New drivers must implement atomic modeset
513 * support, for which this function is unsuitable. Instead drivers should use
514 * drm_atomic_helper_set_config().
517 * Returns 0 on success, negative errno numbers on failure.
519 int drm_crtc_helper_set_config(struct drm_mode_set *set,
520 struct drm_modeset_acquire_ctx *ctx)
522 struct drm_device *dev;
523 struct drm_crtc **save_encoder_crtcs, *new_crtc;
524 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
525 bool mode_changed = false; /* if true do a full mode set */
526 bool fb_changed = false; /* if true and !mode_changed just do a flip */
527 struct drm_connector *connector;
528 struct drm_connector_list_iter conn_iter;
529 int count = 0, ro, fail = 0;
530 const struct drm_crtc_helper_funcs *crtc_funcs;
531 struct drm_mode_set save_set;
539 BUG_ON(!set->crtc->helper_private);
541 /* Enforce sane interface api - has been abused by the fb helper. */
542 BUG_ON(!set->mode && set->fb);
543 BUG_ON(set->fb && set->num_connectors == 0);
545 crtc_funcs = set->crtc->helper_private;
547 dev = set->crtc->dev;
548 WARN_ON(drm_drv_uses_atomic_modeset(dev));
554 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
555 set->crtc->base.id, set->crtc->name,
557 (int)set->num_connectors, set->x, set->y);
559 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
560 set->crtc->base.id, set->crtc->name);
561 drm_crtc_helper_disable(set->crtc);
565 drm_warn_on_modeset_not_all_locked(dev);
568 * Allocate space for the backup of all (non-pointer) encoder and
571 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder,
572 sizeof(struct drm_crtc *), GFP_KERNEL);
573 if (!save_encoder_crtcs)
576 save_connector_encoders = kcalloc(dev->mode_config.num_connector,
577 sizeof(struct drm_encoder *), GFP_KERNEL);
578 if (!save_connector_encoders) {
579 kfree(save_encoder_crtcs);
584 * Copy data. Note that driver private data is not affected.
585 * Should anything bad happen only the expected state is
586 * restored, not the drivers personal bookkeeping.
589 drm_for_each_encoder(encoder, dev) {
590 save_encoder_crtcs[count++] = encoder->crtc;
594 drm_connector_list_iter_begin(dev, &conn_iter);
595 drm_for_each_connector_iter(connector, &conn_iter)
596 save_connector_encoders[count++] = connector->encoder;
597 drm_connector_list_iter_end(&conn_iter);
599 save_set.crtc = set->crtc;
600 save_set.mode = &set->crtc->mode;
601 save_set.x = set->crtc->x;
602 save_set.y = set->crtc->y;
603 save_set.fb = set->crtc->primary->fb;
605 /* We should be able to check here if the fb has the same properties
606 * and then just flip_or_move it */
607 if (set->crtc->primary->fb != set->fb) {
608 /* If we have no fb then treat it as a full mode set */
609 if (set->crtc->primary->fb == NULL) {
610 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
612 } else if (set->fb->format != set->crtc->primary->fb->format) {
618 if (set->x != set->crtc->x || set->y != set->crtc->y)
621 if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
622 DRM_DEBUG_KMS("modes are different, full mode set\n");
623 drm_mode_debug_printmodeline(&set->crtc->mode);
624 drm_mode_debug_printmodeline(set->mode);
628 /* take a reference on all unbound connectors in set, reuse the
629 * already taken reference for bound connectors
631 for (ro = 0; ro < set->num_connectors; ro++) {
632 if (set->connectors[ro]->encoder)
634 drm_connector_get(set->connectors[ro]);
637 /* a) traverse passed in connector list and get encoders for them */
639 drm_connector_list_iter_begin(dev, &conn_iter);
640 drm_for_each_connector_iter(connector, &conn_iter) {
641 const struct drm_connector_helper_funcs *connector_funcs =
642 connector->helper_private;
643 new_encoder = connector->encoder;
644 for (ro = 0; ro < set->num_connectors; ro++) {
645 if (set->connectors[ro] == connector) {
646 new_encoder = connector_funcs->best_encoder(connector);
647 /* if we can't get an encoder for a connector
648 we are setting now - then fail */
649 if (new_encoder == NULL)
650 /* don't break so fail path works correct */
653 if (connector->dpms != DRM_MODE_DPMS_ON) {
654 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
662 if (new_encoder != connector->encoder) {
663 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
665 /* If the encoder is reused for another connector, then
666 * the appropriate crtc will be set later.
668 if (connector->encoder)
669 connector->encoder->crtc = NULL;
670 connector->encoder = new_encoder;
673 drm_connector_list_iter_end(&conn_iter);
681 drm_connector_list_iter_begin(dev, &conn_iter);
682 drm_for_each_connector_iter(connector, &conn_iter) {
683 if (!connector->encoder)
686 if (connector->encoder->crtc == set->crtc)
689 new_crtc = connector->encoder->crtc;
691 for (ro = 0; ro < set->num_connectors; ro++) {
692 if (set->connectors[ro] == connector)
693 new_crtc = set->crtc;
696 /* Make sure the new CRTC will work with the encoder */
698 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
700 drm_connector_list_iter_end(&conn_iter);
703 if (new_crtc != connector->encoder->crtc) {
704 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
706 connector->encoder->crtc = new_crtc;
709 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
710 connector->base.id, connector->name,
711 new_crtc->base.id, new_crtc->name);
713 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
714 connector->base.id, connector->name);
717 drm_connector_list_iter_end(&conn_iter);
719 /* mode_set_base is not a required function */
720 if (fb_changed && !crtc_funcs->mode_set_base)
724 if (drm_helper_crtc_in_use(set->crtc)) {
725 DRM_DEBUG_KMS("attempting to set mode from"
727 drm_mode_debug_printmodeline(set->mode);
728 set->crtc->primary->fb = set->fb;
729 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
732 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
733 set->crtc->base.id, set->crtc->name);
734 set->crtc->primary->fb = save_set.fb;
738 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
739 for (i = 0; i < set->num_connectors; i++) {
740 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
741 set->connectors[i]->name);
742 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
745 __drm_helper_disable_unused_functions(dev);
746 } else if (fb_changed) {
747 set->crtc->x = set->x;
748 set->crtc->y = set->y;
749 set->crtc->primary->fb = set->fb;
750 ret = crtc_funcs->mode_set_base(set->crtc,
751 set->x, set->y, save_set.fb);
753 set->crtc->x = save_set.x;
754 set->crtc->y = save_set.y;
755 set->crtc->primary->fb = save_set.fb;
760 kfree(save_connector_encoders);
761 kfree(save_encoder_crtcs);
765 /* Restore all previous data. */
767 drm_for_each_encoder(encoder, dev) {
768 encoder->crtc = save_encoder_crtcs[count++];
772 drm_connector_list_iter_begin(dev, &conn_iter);
773 drm_for_each_connector_iter(connector, &conn_iter)
774 connector->encoder = save_connector_encoders[count++];
775 drm_connector_list_iter_end(&conn_iter);
777 /* after fail drop reference on all unbound connectors in set, let
778 * bound connectors keep their reference
780 for (ro = 0; ro < set->num_connectors; ro++) {
781 if (set->connectors[ro]->encoder)
783 drm_connector_put(set->connectors[ro]);
786 /* Try to restore the config */
788 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
789 save_set.y, save_set.fb))
790 DRM_ERROR("failed to restore config after modeset failure\n");
792 kfree(save_connector_encoders);
793 kfree(save_encoder_crtcs);
796 EXPORT_SYMBOL(drm_crtc_helper_set_config);
798 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
800 int dpms = DRM_MODE_DPMS_OFF;
801 struct drm_connector *connector;
802 struct drm_connector_list_iter conn_iter;
803 struct drm_device *dev = encoder->dev;
805 drm_connector_list_iter_begin(dev, &conn_iter);
806 drm_for_each_connector_iter(connector, &conn_iter)
807 if (connector->encoder == encoder)
808 if (connector->dpms < dpms)
809 dpms = connector->dpms;
810 drm_connector_list_iter_end(&conn_iter);
815 /* Helper which handles bridge ordering around encoder dpms */
816 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
818 struct drm_bridge *bridge = encoder->bridge;
819 const struct drm_encoder_helper_funcs *encoder_funcs;
821 encoder_funcs = encoder->helper_private;
825 if (mode == DRM_MODE_DPMS_ON)
826 drm_bridge_pre_enable(bridge);
828 drm_bridge_disable(bridge);
830 if (encoder_funcs->dpms)
831 encoder_funcs->dpms(encoder, mode);
833 if (mode == DRM_MODE_DPMS_ON)
834 drm_bridge_enable(bridge);
836 drm_bridge_post_disable(bridge);
839 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
841 int dpms = DRM_MODE_DPMS_OFF;
842 struct drm_connector *connector;
843 struct drm_connector_list_iter conn_iter;
844 struct drm_device *dev = crtc->dev;
846 drm_connector_list_iter_begin(dev, &conn_iter);
847 drm_for_each_connector_iter(connector, &conn_iter)
848 if (connector->encoder && connector->encoder->crtc == crtc)
849 if (connector->dpms < dpms)
850 dpms = connector->dpms;
851 drm_connector_list_iter_end(&conn_iter);
857 * drm_helper_connector_dpms() - connector dpms helper implementation
858 * @connector: affected connector
861 * The drm_helper_connector_dpms() helper function implements the
862 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
865 * This is the main helper function provided by the CRTC helper framework for
866 * implementing the DPMS connector attribute. It computes the new desired DPMS
867 * state for all encoders and CRTCs in the output mesh and calls the
868 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
869 * provided by the driver.
871 * This function is deprecated. New drivers must implement atomic modeset
872 * support, where DPMS is handled in the DRM core.
877 int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
879 struct drm_encoder *encoder = connector->encoder;
880 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
881 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
883 WARN_ON(drm_drv_uses_atomic_modeset(connector->dev));
885 if (mode == connector->dpms)
888 old_dpms = connector->dpms;
889 connector->dpms = mode;
892 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
894 /* from off to on, do crtc then encoder */
895 if (mode < old_dpms) {
897 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
898 if (crtc_funcs->dpms)
899 (*crtc_funcs->dpms) (crtc,
900 drm_helper_choose_crtc_dpms(crtc));
903 drm_helper_encoder_dpms(encoder, encoder_dpms);
906 /* from on to off, do encoder then crtc */
907 if (mode > old_dpms) {
909 drm_helper_encoder_dpms(encoder, encoder_dpms);
911 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
912 if (crtc_funcs->dpms)
913 (*crtc_funcs->dpms) (crtc,
914 drm_helper_choose_crtc_dpms(crtc));
920 EXPORT_SYMBOL(drm_helper_connector_dpms);
923 * drm_helper_resume_force_mode - force-restore mode setting configuration
924 * @dev: drm_device which should be restored
926 * Drivers which use the mode setting helpers can use this function to
927 * force-restore the mode setting configuration e.g. on resume or when something
928 * else might have trampled over the hw state (like some overzealous old BIOSen
931 * This helper doesn't provide a error return value since restoring the old
932 * config should never fail due to resource allocation issues since the driver
933 * has successfully set the restored configuration already. Hence this should
934 * boil down to the equivalent of a few dpms on calls, which also don't provide
937 * Drivers where simply restoring an old configuration again might fail (e.g.
938 * due to slight differences in allocating shared resources when the
939 * configuration is restored in a different order than when userspace set it up)
940 * need to use their own restore logic.
942 * This function is deprecated. New drivers should implement atomic mode-
943 * setting and use the atomic suspend/resume helpers.
946 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
948 void drm_helper_resume_force_mode(struct drm_device *dev)
950 struct drm_crtc *crtc;
951 struct drm_encoder *encoder;
952 const struct drm_crtc_helper_funcs *crtc_funcs;
956 WARN_ON(drm_drv_uses_atomic_modeset(dev));
958 drm_modeset_lock_all(dev);
959 drm_for_each_crtc(crtc, dev) {
964 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
965 crtc->x, crtc->y, crtc->primary->fb);
967 /* Restoring the old config should never fail! */
969 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
971 /* Turn off outputs that were already powered off */
972 if (drm_helper_choose_crtc_dpms(crtc)) {
973 drm_for_each_encoder(encoder, dev) {
975 if(encoder->crtc != crtc)
978 encoder_dpms = drm_helper_choose_encoder_dpms(
981 drm_helper_encoder_dpms(encoder, encoder_dpms);
984 crtc_funcs = crtc->helper_private;
985 if (crtc_funcs->dpms)
986 (*crtc_funcs->dpms) (crtc,
987 drm_helper_choose_crtc_dpms(crtc));
991 /* disable the unused connectors while restoring the modesetting */
992 __drm_helper_disable_unused_functions(dev);
993 drm_modeset_unlock_all(dev);
995 EXPORT_SYMBOL(drm_helper_resume_force_mode);
998 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs
999 * @dev: DRM device whose CRTCs to turn off
1001 * Drivers may want to call this on unload to ensure that all displays are
1002 * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
1004 * Note: This should only be used by non-atomic legacy drivers. For an atomic
1005 * version look at drm_atomic_helper_shutdown().
1008 * Zero on success, error code on failure.
1010 int drm_helper_force_disable_all(struct drm_device *dev)
1012 struct drm_crtc *crtc;
1015 drm_modeset_lock_all(dev);
1016 drm_for_each_crtc(crtc, dev)
1017 if (crtc->enabled) {
1018 struct drm_mode_set set = {
1022 ret = drm_mode_set_config_internal(&set);
1027 drm_modeset_unlock_all(dev);
1030 EXPORT_SYMBOL(drm_helper_force_disable_all);