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/kernel.h>
34 #include <linux/moduleparam.h>
36 #include <drm/drm_atomic.h>
37 #include <drm/drm_atomic_helper.h>
38 #include <drm/drm_atomic_uapi.h>
39 #include <drm/drm_bridge.h>
40 #include <drm/drm_crtc.h>
41 #include <drm/drm_crtc_helper.h>
42 #include <drm/drm_drv.h>
43 #include <drm/drm_edid.h>
44 #include <drm/drm_encoder.h>
45 #include <drm/drm_fb_helper.h>
46 #include <drm/drm_fourcc.h>
47 #include <drm/drm_plane_helper.h>
48 #include <drm/drm_print.h>
49 #include <drm/drm_vblank.h>
51 #include "drm_crtc_helper_internal.h"
56 * The CRTC modeset helper library provides a default set_config implementation
57 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
58 * the same callbacks which drivers can use to e.g. restore the modeset
59 * configuration on resume with drm_helper_resume_force_mode().
61 * Note that this helper library doesn't track the current power state of CRTCs
62 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even
63 * though the hardware is already in the desired state. This deficiency has been
64 * fixed in the atomic helpers.
66 * The driver callbacks are mostly compatible with the atomic modeset helpers,
67 * except for the handling of the primary plane: Atomic helpers require that the
68 * primary plane is implemented as a real standalone plane and not directly tied
69 * to the CRTC state. For easier transition this library provides functions to
70 * implement the old semantics required by the CRTC helpers using the new plane
71 * and atomic helper callbacks.
73 * Drivers are strongly urged to convert to the atomic helpers (by way of first
74 * converting to the plane helpers). New drivers must not use these functions
75 * but need to implement the atomic interface instead, potentially using the
76 * atomic helpers for that.
78 * These legacy modeset helpers use the same function table structures as
79 * all other modesetting helpers. See the documentation for struct
80 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct
81 * &drm_connector_helper_funcs.
85 * drm_helper_encoder_in_use - check if a given encoder is in use
86 * @encoder: encoder to check
88 * Checks whether @encoder is with the current mode setting output configuration
89 * in use by any connector. This doesn't mean that it is actually enabled since
90 * the DPMS state is tracked separately.
93 * True if @encoder is used, false otherwise.
95 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
97 struct drm_connector *connector;
98 struct drm_connector_list_iter conn_iter;
99 struct drm_device *dev = encoder->dev;
101 WARN_ON(drm_drv_uses_atomic_modeset(dev));
104 * We can expect this mutex to be locked if we are not panicking.
105 * Locking is currently fubar in the panic handler.
107 if (!oops_in_progress) {
108 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
109 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
113 drm_connector_list_iter_begin(dev, &conn_iter);
114 drm_for_each_connector_iter(connector, &conn_iter) {
115 if (connector->encoder == encoder) {
116 drm_connector_list_iter_end(&conn_iter);
120 drm_connector_list_iter_end(&conn_iter);
123 EXPORT_SYMBOL(drm_helper_encoder_in_use);
126 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
127 * @crtc: CRTC to check
129 * Checks whether @crtc is with the current mode setting output configuration
130 * in use by any connector. This doesn't mean that it is actually enabled since
131 * the DPMS state is tracked separately.
134 * True if @crtc is used, false otherwise.
136 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
138 struct drm_encoder *encoder;
139 struct drm_device *dev = crtc->dev;
141 WARN_ON(drm_drv_uses_atomic_modeset(dev));
144 * We can expect this mutex to be locked if we are not panicking.
145 * Locking is currently fubar in the panic handler.
147 if (!oops_in_progress)
148 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
150 drm_for_each_encoder(encoder, dev)
151 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
155 EXPORT_SYMBOL(drm_helper_crtc_in_use);
158 drm_encoder_disable(struct drm_encoder *encoder)
160 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
165 if (encoder_funcs->disable)
166 (*encoder_funcs->disable)(encoder);
167 else if (encoder_funcs->dpms)
168 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
171 static void __drm_helper_disable_unused_functions(struct drm_device *dev)
173 struct drm_encoder *encoder;
174 struct drm_crtc *crtc;
176 drm_warn_on_modeset_not_all_locked(dev);
178 drm_for_each_encoder(encoder, dev) {
179 if (!drm_helper_encoder_in_use(encoder)) {
180 drm_encoder_disable(encoder);
181 /* disconnect encoder from any connector */
182 encoder->crtc = NULL;
186 drm_for_each_crtc(crtc, dev) {
187 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
189 crtc->enabled = drm_helper_crtc_in_use(crtc);
190 if (!crtc->enabled) {
191 if (crtc_funcs->disable)
192 (*crtc_funcs->disable)(crtc);
194 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
195 crtc->primary->fb = NULL;
201 * drm_helper_disable_unused_functions - disable unused objects
204 * This function walks through the entire mode setting configuration of @dev. It
205 * will remove any CRTC links of unused encoders and encoder links of
206 * disconnected connectors. Then it will disable all unused encoders and CRTCs
207 * either by calling their disable callback if available or by calling their
208 * dpms callback with DRM_MODE_DPMS_OFF.
212 * This function is part of the legacy modeset helper library and will cause
213 * major confusion with atomic drivers. This is because atomic helpers guarantee
214 * to never call ->disable() hooks on a disabled function, or ->enable() hooks
215 * on an enabled functions. drm_helper_disable_unused_functions() on the other
216 * hand throws such guarantees into the wind and calls disable hooks
217 * unconditionally on unused functions.
219 void drm_helper_disable_unused_functions(struct drm_device *dev)
221 WARN_ON(drm_drv_uses_atomic_modeset(dev));
223 drm_modeset_lock_all(dev);
224 __drm_helper_disable_unused_functions(dev);
225 drm_modeset_unlock_all(dev);
227 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
230 * Check the CRTC we're going to map each output to vs. its current
231 * CRTC. If they don't match, we have to disable the output and the CRTC
232 * since the driver will have to re-route things.
235 drm_crtc_prepare_encoders(struct drm_device *dev)
237 const struct drm_encoder_helper_funcs *encoder_funcs;
238 struct drm_encoder *encoder;
240 drm_for_each_encoder(encoder, dev) {
241 encoder_funcs = encoder->helper_private;
245 /* Disable unused encoders */
246 if (encoder->crtc == NULL)
247 drm_encoder_disable(encoder);
252 * drm_crtc_helper_set_mode - internal helper to set a mode
253 * @crtc: CRTC to program
255 * @x: horizontal offset into the surface
256 * @y: vertical offset into the surface
257 * @old_fb: old framebuffer, for cleanup
259 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
260 * to fixup or reject the mode prior to trying to set it. This is an internal
261 * helper that drivers could e.g. use to update properties that require the
262 * entire output pipe to be disabled and re-enabled in a new configuration. For
263 * example for changing whether audio is enabled on a hdmi link or for changing
264 * panel fitter or dither attributes. It is also called by the
265 * drm_crtc_helper_set_config() helper function to drive the mode setting
269 * True if the mode was set successfully, false otherwise.
271 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
272 struct drm_display_mode *mode,
274 struct drm_framebuffer *old_fb)
276 struct drm_device *dev = crtc->dev;
277 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
278 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
279 const struct drm_encoder_helper_funcs *encoder_funcs;
280 int saved_x, saved_y;
282 struct drm_encoder *encoder;
285 WARN_ON(drm_drv_uses_atomic_modeset(dev));
287 drm_warn_on_modeset_not_all_locked(dev);
289 saved_enabled = crtc->enabled;
290 crtc->enabled = drm_helper_crtc_in_use(crtc);
294 adjusted_mode = drm_mode_duplicate(dev, mode);
295 if (!adjusted_mode) {
296 crtc->enabled = saved_enabled;
300 drm_mode_init(&saved_mode, &crtc->mode);
301 drm_mode_init(&saved_hwmode, &crtc->hwmode);
305 /* Update crtc values up front so the driver can rely on them for mode
308 drm_mode_copy(&crtc->mode, mode);
312 /* Pass our mode to the connectors and the CRTC to give them a chance to
313 * adjust it according to limitations or connector properties, and also
314 * a chance to reject the mode entirely.
316 drm_for_each_encoder(encoder, dev) {
318 if (encoder->crtc != crtc)
321 encoder_funcs = encoder->helper_private;
325 encoder_funcs = encoder->helper_private;
326 if (encoder_funcs->mode_fixup) {
327 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
329 DRM_DEBUG_KMS("Encoder fixup failed\n");
335 if (crtc_funcs->mode_fixup) {
336 if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
338 DRM_DEBUG_KMS("CRTC fixup failed\n");
342 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
344 drm_mode_copy(&crtc->hwmode, adjusted_mode);
346 /* Prepare the encoders and CRTCs before setting the mode. */
347 drm_for_each_encoder(encoder, dev) {
349 if (encoder->crtc != crtc)
352 encoder_funcs = encoder->helper_private;
356 /* Disable the encoders as the first thing we do. */
357 if (encoder_funcs->prepare)
358 encoder_funcs->prepare(encoder);
361 drm_crtc_prepare_encoders(dev);
363 crtc_funcs->prepare(crtc);
365 /* Set up the DPLL and any encoders state that needs to adjust or depend
368 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
372 drm_for_each_encoder(encoder, dev) {
374 if (encoder->crtc != crtc)
377 encoder_funcs = encoder->helper_private;
381 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%s]\n",
382 encoder->base.id, encoder->name, mode->name);
383 if (encoder_funcs->mode_set)
384 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
387 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
388 crtc_funcs->commit(crtc);
390 drm_for_each_encoder(encoder, dev) {
392 if (encoder->crtc != crtc)
395 encoder_funcs = encoder->helper_private;
399 if (encoder_funcs->commit)
400 encoder_funcs->commit(encoder);
403 /* Calculate and store various constants which
404 * are later needed by vblank and swap-completion
405 * timestamping. They are derived from true hwmode.
407 drm_calc_timestamping_constants(crtc, &crtc->hwmode);
409 /* FIXME: add subpixel order */
411 drm_mode_destroy(dev, adjusted_mode);
413 crtc->enabled = saved_enabled;
414 drm_mode_copy(&crtc->mode, &saved_mode);
415 drm_mode_copy(&crtc->hwmode, &saved_hwmode);
422 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
425 drm_crtc_helper_disable(struct drm_crtc *crtc)
427 struct drm_device *dev = crtc->dev;
428 struct drm_connector *connector;
429 struct drm_encoder *encoder;
431 /* Decouple all encoders and their attached connectors from this crtc */
432 drm_for_each_encoder(encoder, dev) {
433 struct drm_connector_list_iter conn_iter;
435 if (encoder->crtc != crtc)
438 drm_connector_list_iter_begin(dev, &conn_iter);
439 drm_for_each_connector_iter(connector, &conn_iter) {
440 if (connector->encoder != encoder)
443 connector->encoder = NULL;
446 * drm_helper_disable_unused_functions() ought to be
447 * doing this, but since we've decoupled the encoder
448 * from the connector above, the required connection
449 * between them is henceforth no longer available.
451 connector->dpms = DRM_MODE_DPMS_OFF;
453 /* we keep a reference while the encoder is bound */
454 drm_connector_put(connector);
456 drm_connector_list_iter_end(&conn_iter);
459 __drm_helper_disable_unused_functions(dev);
463 * For connectors that support multiple encoders, either the
464 * .atomic_best_encoder() or .best_encoder() operation must be implemented.
467 drm_connector_get_single_encoder(struct drm_connector *connector)
469 struct drm_encoder *encoder;
471 WARN_ON(hweight32(connector->possible_encoders) > 1);
472 drm_connector_for_each_possible_encoder(connector, encoder)
479 * drm_crtc_helper_set_config - set a new config from userspace
480 * @set: mode set configuration
481 * @ctx: lock acquire context, not used here
483 * The drm_crtc_helper_set_config() helper function implements the of
484 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
487 * It first tries to locate the best encoder for each connector by calling the
488 * connector @drm_connector_helper_funcs.best_encoder helper operation.
490 * After locating the appropriate encoders, the helper function will call the
491 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
492 * or reject it completely in which case an error will be returned to the
493 * application. If the new configuration after mode adjustment is identical to
494 * the current configuration the helper function will return without performing
495 * any other operation.
497 * If the adjusted mode is identical to the current mode but changes to the
498 * frame buffer need to be applied, the drm_crtc_helper_set_config() function
499 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
501 * If the adjusted mode differs from the current mode, or if the
502 * ->mode_set_base() helper operation is not provided, the helper function
503 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
504 * and ->commit() CRTC and encoder helper operations, in that order.
505 * Alternatively it can also use the dpms and disable helper operations. For
506 * details see &struct drm_crtc_helper_funcs and struct
507 * &drm_encoder_helper_funcs.
509 * This function is deprecated. New drivers must implement atomic modeset
510 * support, for which this function is unsuitable. Instead drivers should use
511 * drm_atomic_helper_set_config().
514 * Returns 0 on success, negative errno numbers on failure.
516 int drm_crtc_helper_set_config(struct drm_mode_set *set,
517 struct drm_modeset_acquire_ctx *ctx)
519 struct drm_device *dev;
520 struct drm_crtc **save_encoder_crtcs, *new_crtc;
521 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
522 bool mode_changed = false; /* if true do a full mode set */
523 bool fb_changed = false; /* if true and !mode_changed just do a flip */
524 struct drm_connector *connector;
525 struct drm_connector_list_iter conn_iter;
526 int count = 0, ro, fail = 0;
527 const struct drm_crtc_helper_funcs *crtc_funcs;
528 struct drm_mode_set save_set;
536 BUG_ON(!set->crtc->helper_private);
538 /* Enforce sane interface api - has been abused by the fb helper. */
539 BUG_ON(!set->mode && set->fb);
540 BUG_ON(set->fb && set->num_connectors == 0);
542 crtc_funcs = set->crtc->helper_private;
544 dev = set->crtc->dev;
545 WARN_ON(drm_drv_uses_atomic_modeset(dev));
551 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
552 set->crtc->base.id, set->crtc->name,
554 (int)set->num_connectors, set->x, set->y);
556 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
557 set->crtc->base.id, set->crtc->name);
558 drm_crtc_helper_disable(set->crtc);
562 drm_warn_on_modeset_not_all_locked(dev);
565 * Allocate space for the backup of all (non-pointer) encoder and
568 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder,
569 sizeof(struct drm_crtc *), GFP_KERNEL);
570 if (!save_encoder_crtcs)
573 save_connector_encoders = kcalloc(dev->mode_config.num_connector,
574 sizeof(struct drm_encoder *), GFP_KERNEL);
575 if (!save_connector_encoders) {
576 kfree(save_encoder_crtcs);
581 * Copy data. Note that driver private data is not affected.
582 * Should anything bad happen only the expected state is
583 * restored, not the drivers personal bookkeeping.
586 drm_for_each_encoder(encoder, dev) {
587 save_encoder_crtcs[count++] = encoder->crtc;
591 drm_connector_list_iter_begin(dev, &conn_iter);
592 drm_for_each_connector_iter(connector, &conn_iter)
593 save_connector_encoders[count++] = connector->encoder;
594 drm_connector_list_iter_end(&conn_iter);
596 save_set.crtc = set->crtc;
597 save_set.mode = &set->crtc->mode;
598 save_set.x = set->crtc->x;
599 save_set.y = set->crtc->y;
600 save_set.fb = set->crtc->primary->fb;
602 /* We should be able to check here if the fb has the same properties
603 * and then just flip_or_move it */
604 if (set->crtc->primary->fb != set->fb) {
605 /* If we have no fb then treat it as a full mode set */
606 if (set->crtc->primary->fb == NULL) {
607 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
609 } else if (set->fb->format != set->crtc->primary->fb->format) {
615 if (set->x != set->crtc->x || set->y != set->crtc->y)
618 if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
619 DRM_DEBUG_KMS("modes are different, full mode set\n");
620 drm_mode_debug_printmodeline(&set->crtc->mode);
621 drm_mode_debug_printmodeline(set->mode);
625 /* take a reference on all unbound connectors in set, reuse the
626 * already taken reference for bound connectors
628 for (ro = 0; ro < set->num_connectors; ro++) {
629 if (set->connectors[ro]->encoder)
631 drm_connector_get(set->connectors[ro]);
634 /* a) traverse passed in connector list and get encoders for them */
636 drm_connector_list_iter_begin(dev, &conn_iter);
637 drm_for_each_connector_iter(connector, &conn_iter) {
638 const struct drm_connector_helper_funcs *connector_funcs =
639 connector->helper_private;
640 new_encoder = connector->encoder;
641 for (ro = 0; ro < set->num_connectors; ro++) {
642 if (set->connectors[ro] == connector) {
643 if (connector_funcs->best_encoder)
644 new_encoder = connector_funcs->best_encoder(connector);
646 new_encoder = drm_connector_get_single_encoder(connector);
648 /* if we can't get an encoder for a connector
649 we are setting now - then fail */
650 if (new_encoder == NULL)
651 /* don't break so fail path works correct */
654 if (connector->dpms != DRM_MODE_DPMS_ON) {
655 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
663 if (new_encoder != connector->encoder) {
664 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
666 /* If the encoder is reused for another connector, then
667 * the appropriate crtc will be set later.
669 if (connector->encoder)
670 connector->encoder->crtc = NULL;
671 connector->encoder = new_encoder;
674 drm_connector_list_iter_end(&conn_iter);
682 drm_connector_list_iter_begin(dev, &conn_iter);
683 drm_for_each_connector_iter(connector, &conn_iter) {
684 if (!connector->encoder)
687 if (connector->encoder->crtc == set->crtc)
690 new_crtc = connector->encoder->crtc;
692 for (ro = 0; ro < set->num_connectors; ro++) {
693 if (set->connectors[ro] == connector)
694 new_crtc = set->crtc;
697 /* Make sure the new CRTC will work with the encoder */
699 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
701 drm_connector_list_iter_end(&conn_iter);
704 if (new_crtc != connector->encoder->crtc) {
705 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
707 connector->encoder->crtc = new_crtc;
710 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
711 connector->base.id, connector->name,
712 new_crtc->base.id, new_crtc->name);
714 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
715 connector->base.id, connector->name);
718 drm_connector_list_iter_end(&conn_iter);
720 /* mode_set_base is not a required function */
721 if (fb_changed && !crtc_funcs->mode_set_base)
725 if (drm_helper_crtc_in_use(set->crtc)) {
726 DRM_DEBUG_KMS("attempting to set mode from"
728 drm_mode_debug_printmodeline(set->mode);
729 set->crtc->primary->fb = set->fb;
730 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
733 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
734 set->crtc->base.id, set->crtc->name);
735 set->crtc->primary->fb = save_set.fb;
739 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
740 for (i = 0; i < set->num_connectors; i++) {
741 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
742 set->connectors[i]->name);
743 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
746 __drm_helper_disable_unused_functions(dev);
747 } else if (fb_changed) {
748 set->crtc->x = set->x;
749 set->crtc->y = set->y;
750 set->crtc->primary->fb = set->fb;
751 ret = crtc_funcs->mode_set_base(set->crtc,
752 set->x, set->y, save_set.fb);
754 set->crtc->x = save_set.x;
755 set->crtc->y = save_set.y;
756 set->crtc->primary->fb = save_set.fb;
761 kfree(save_connector_encoders);
762 kfree(save_encoder_crtcs);
766 /* Restore all previous data. */
768 drm_for_each_encoder(encoder, dev) {
769 encoder->crtc = save_encoder_crtcs[count++];
773 drm_connector_list_iter_begin(dev, &conn_iter);
774 drm_for_each_connector_iter(connector, &conn_iter)
775 connector->encoder = save_connector_encoders[count++];
776 drm_connector_list_iter_end(&conn_iter);
778 /* after fail drop reference on all unbound connectors in set, let
779 * bound connectors keep their reference
781 for (ro = 0; ro < set->num_connectors; ro++) {
782 if (set->connectors[ro]->encoder)
784 drm_connector_put(set->connectors[ro]);
787 /* Try to restore the config */
789 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
790 save_set.y, save_set.fb))
791 DRM_ERROR("failed to restore config after modeset failure\n");
793 kfree(save_connector_encoders);
794 kfree(save_encoder_crtcs);
797 EXPORT_SYMBOL(drm_crtc_helper_set_config);
799 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
801 int dpms = DRM_MODE_DPMS_OFF;
802 struct drm_connector *connector;
803 struct drm_connector_list_iter conn_iter;
804 struct drm_device *dev = encoder->dev;
806 drm_connector_list_iter_begin(dev, &conn_iter);
807 drm_for_each_connector_iter(connector, &conn_iter)
808 if (connector->encoder == encoder)
809 if (connector->dpms < dpms)
810 dpms = connector->dpms;
811 drm_connector_list_iter_end(&conn_iter);
816 /* Helper which handles bridge ordering around encoder dpms */
817 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
819 const struct drm_encoder_helper_funcs *encoder_funcs;
821 encoder_funcs = encoder->helper_private;
825 if (encoder_funcs->dpms)
826 encoder_funcs->dpms(encoder, mode);
829 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
831 int dpms = DRM_MODE_DPMS_OFF;
832 struct drm_connector *connector;
833 struct drm_connector_list_iter conn_iter;
834 struct drm_device *dev = crtc->dev;
836 drm_connector_list_iter_begin(dev, &conn_iter);
837 drm_for_each_connector_iter(connector, &conn_iter)
838 if (connector->encoder && connector->encoder->crtc == crtc)
839 if (connector->dpms < dpms)
840 dpms = connector->dpms;
841 drm_connector_list_iter_end(&conn_iter);
847 * drm_helper_connector_dpms() - connector dpms helper implementation
848 * @connector: affected connector
851 * The drm_helper_connector_dpms() helper function implements the
852 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
855 * This is the main helper function provided by the CRTC helper framework for
856 * implementing the DPMS connector attribute. It computes the new desired DPMS
857 * state for all encoders and CRTCs in the output mesh and calls the
858 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
859 * provided by the driver.
861 * This function is deprecated. New drivers must implement atomic modeset
862 * support, where DPMS is handled in the DRM core.
867 int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
869 struct drm_encoder *encoder = connector->encoder;
870 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
871 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
873 WARN_ON(drm_drv_uses_atomic_modeset(connector->dev));
875 if (mode == connector->dpms)
878 old_dpms = connector->dpms;
879 connector->dpms = mode;
882 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
884 /* from off to on, do crtc then encoder */
885 if (mode < old_dpms) {
887 const 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));
894 drm_helper_encoder_dpms(encoder, encoder_dpms);
897 /* from on to off, do encoder then crtc */
898 if (mode > old_dpms) {
900 drm_helper_encoder_dpms(encoder, encoder_dpms);
902 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
904 if (crtc_funcs->dpms)
905 (*crtc_funcs->dpms) (crtc,
906 drm_helper_choose_crtc_dpms(crtc));
912 EXPORT_SYMBOL(drm_helper_connector_dpms);
915 * drm_helper_resume_force_mode - force-restore mode setting configuration
916 * @dev: drm_device which should be restored
918 * Drivers which use the mode setting helpers can use this function to
919 * force-restore the mode setting configuration e.g. on resume or when something
920 * else might have trampled over the hw state (like some overzealous old BIOSen
923 * This helper doesn't provide a error return value since restoring the old
924 * config should never fail due to resource allocation issues since the driver
925 * has successfully set the restored configuration already. Hence this should
926 * boil down to the equivalent of a few dpms on calls, which also don't provide
929 * Drivers where simply restoring an old configuration again might fail (e.g.
930 * due to slight differences in allocating shared resources when the
931 * configuration is restored in a different order than when userspace set it up)
932 * need to use their own restore logic.
934 * This function is deprecated. New drivers should implement atomic mode-
935 * setting and use the atomic suspend/resume helpers.
938 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
940 void drm_helper_resume_force_mode(struct drm_device *dev)
942 struct drm_crtc *crtc;
943 struct drm_encoder *encoder;
944 const struct drm_crtc_helper_funcs *crtc_funcs;
948 WARN_ON(drm_drv_uses_atomic_modeset(dev));
950 drm_modeset_lock_all(dev);
951 drm_for_each_crtc(crtc, dev) {
956 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
957 crtc->x, crtc->y, crtc->primary->fb);
959 /* Restoring the old config should never fail! */
961 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
963 /* Turn off outputs that were already powered off */
964 if (drm_helper_choose_crtc_dpms(crtc)) {
965 drm_for_each_encoder(encoder, dev) {
967 if(encoder->crtc != crtc)
970 encoder_dpms = drm_helper_choose_encoder_dpms(
973 drm_helper_encoder_dpms(encoder, encoder_dpms);
976 crtc_funcs = crtc->helper_private;
977 if (crtc_funcs->dpms)
978 (*crtc_funcs->dpms) (crtc,
979 drm_helper_choose_crtc_dpms(crtc));
983 /* disable the unused connectors while restoring the modesetting */
984 __drm_helper_disable_unused_functions(dev);
985 drm_modeset_unlock_all(dev);
987 EXPORT_SYMBOL(drm_helper_resume_force_mode);
990 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs
991 * @dev: DRM device whose CRTCs to turn off
993 * Drivers may want to call this on unload to ensure that all displays are
994 * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
996 * Note: This should only be used by non-atomic legacy drivers. For an atomic
997 * version look at drm_atomic_helper_shutdown().
1000 * Zero on success, error code on failure.
1002 int drm_helper_force_disable_all(struct drm_device *dev)
1004 struct drm_crtc *crtc;
1007 drm_modeset_lock_all(dev);
1008 drm_for_each_crtc(crtc, dev)
1009 if (crtc->enabled) {
1010 struct drm_mode_set set = {
1014 ret = drm_mode_set_config_internal(&set);
1019 drm_modeset_unlock_all(dev);
1022 EXPORT_SYMBOL(drm_helper_force_disable_all);