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_crtc.h>
39 #include <uapi_drm/drm_fourcc.h>
40 #include <drm/drm_crtc_helper.h>
41 #include <drm/drm_fb_helper.h>
42 #include <drm/drm_plane_helper.h>
43 #include <drm/drm_atomic_helper.h>
44 #include <drm/drm_edid.h>
49 * The CRTC modeset helper library provides a default set_config implementation
50 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
51 * the same callbacks which drivers can use to e.g. restore the modeset
52 * configuration on resume with drm_helper_resume_force_mode().
54 * The driver callbacks are mostly compatible with the atomic modeset helpers,
55 * except for the handling of the primary plane: Atomic helpers require that the
56 * primary plane is implemented as a real standalone plane and not directly tied
57 * to the CRTC state. For easier transition this library provides functions to
58 * implement the old semantics required by the CRTC helpers using the new plane
59 * and atomic helper callbacks.
61 * Drivers are strongly urged to convert to the atomic helpers (by way of first
62 * converting to the plane helpers). New drivers must not use these functions
63 * but need to implement the atomic interface instead, potentially using the
64 * atomic helpers for that.
66 MODULE_AUTHOR("David Airlie, Jesse Barnes");
67 MODULE_DESCRIPTION("DRM KMS helper");
70 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
72 * @dev: drm device to operate on
74 * Some userspace presumes that the first connected connector is the main
75 * display, where it's supposed to display e.g. the login screen. For
76 * laptops, this should be the main panel. Use this function to sort all
77 * (eDP/LVDS) panels to the front of the connector list, instead of
78 * painstakingly trying to initialize them in the right order.
80 void drm_helper_move_panel_connectors_to_head(struct drm_device
*dev
)
82 struct drm_connector
*connector
, *tmp
;
83 struct list_head panel_list
;
85 INIT_LIST_HEAD(&panel_list
);
87 list_for_each_entry_safe(connector
, tmp
,
88 &dev
->mode_config
.connector_list
, head
) {
89 if (connector
->connector_type
== DRM_MODE_CONNECTOR_LVDS
||
90 connector
->connector_type
== DRM_MODE_CONNECTOR_eDP
)
91 list_move_tail(&connector
->head
, &panel_list
);
94 list_splice(&panel_list
, &dev
->mode_config
.connector_list
);
96 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head
);
99 * drm_helper_encoder_in_use - check if a given encoder is in use
100 * @encoder: encoder to check
102 * Checks whether @encoder is with the current mode setting output configuration
103 * in use by any connector. This doesn't mean that it is actually enabled since
104 * the DPMS state is tracked separately.
107 * True if @encoder is used, false otherwise.
109 bool drm_helper_encoder_in_use(struct drm_encoder
*encoder
)
111 struct drm_connector
*connector
;
112 struct drm_device
*dev
= encoder
->dev
;
115 * We can expect this mutex to be locked if we are not panicking.
116 * Locking is currently fubar in the panic handler.
119 if (!oops_in_progress
) {
120 WARN_ON(!mutex_is_locked(&dev
->mode_config
.mutex
));
121 WARN_ON(!drm_modeset_is_locked(&dev
->mode_config
.connection_mutex
));
125 drm_for_each_connector(connector
, dev
)
126 if (connector
->encoder
== encoder
)
130 EXPORT_SYMBOL(drm_helper_encoder_in_use
);
133 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
134 * @crtc: CRTC to check
136 * Checks whether @crtc is with the current mode setting output configuration
137 * in use by any connector. This doesn't mean that it is actually enabled since
138 * the DPMS state is tracked separately.
141 * True if @crtc is used, false otherwise.
143 bool drm_helper_crtc_in_use(struct drm_crtc
*crtc
)
145 struct drm_encoder
*encoder
;
146 struct drm_device
*dev
= crtc
->dev
;
149 * We can expect this mutex to be locked if we are not panicking.
150 * Locking is currently fubar in the panic handler.
153 if (!oops_in_progress
)
155 WARN_ON(!mutex_is_locked(&dev
->mode_config
.mutex
));
157 drm_for_each_encoder(encoder
, dev
)
158 if (encoder
->crtc
== crtc
&& drm_helper_encoder_in_use(encoder
))
162 EXPORT_SYMBOL(drm_helper_crtc_in_use
);
165 drm_encoder_disable(struct drm_encoder
*encoder
)
167 const struct drm_encoder_helper_funcs
*encoder_funcs
= encoder
->helper_private
;
169 drm_bridge_disable(encoder
->bridge
);
171 if (encoder_funcs
->disable
)
172 (*encoder_funcs
->disable
)(encoder
);
174 (*encoder_funcs
->dpms
)(encoder
, DRM_MODE_DPMS_OFF
);
176 drm_bridge_post_disable(encoder
->bridge
);
179 static void __drm_helper_disable_unused_functions(struct drm_device
*dev
)
181 struct drm_encoder
*encoder
;
182 struct drm_crtc
*crtc
;
184 drm_warn_on_modeset_not_all_locked(dev
);
186 drm_for_each_encoder(encoder
, dev
) {
187 if (!drm_helper_encoder_in_use(encoder
)) {
188 drm_encoder_disable(encoder
);
189 /* disconnect encoder from any connector */
190 encoder
->crtc
= NULL
;
194 drm_for_each_crtc(crtc
, dev
) {
195 const struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
196 crtc
->enabled
= drm_helper_crtc_in_use(crtc
);
197 if (!crtc
->enabled
) {
198 if (crtc_funcs
->disable
)
199 (*crtc_funcs
->disable
)(crtc
);
201 (*crtc_funcs
->dpms
)(crtc
, DRM_MODE_DPMS_OFF
);
202 crtc
->primary
->fb
= NULL
;
208 * drm_helper_disable_unused_functions - disable unused objects
211 * This function walks through the entire mode setting configuration of @dev. It
212 * will remove any crtc links of unused encoders and encoder links of
213 * disconnected connectors. Then it will disable all unused encoders and crtcs
214 * either by calling their disable callback if available or by calling their
215 * dpms callback with DRM_MODE_DPMS_OFF.
217 void drm_helper_disable_unused_functions(struct drm_device
*dev
)
219 drm_modeset_lock_all(dev
);
220 __drm_helper_disable_unused_functions(dev
);
221 drm_modeset_unlock_all(dev
);
223 EXPORT_SYMBOL(drm_helper_disable_unused_functions
);
226 * Check the CRTC we're going to map each output to vs. its current
227 * CRTC. If they don't match, we have to disable the output and the CRTC
228 * since the driver will have to re-route things.
231 drm_crtc_prepare_encoders(struct drm_device
*dev
)
233 const struct drm_encoder_helper_funcs
*encoder_funcs
;
234 struct drm_encoder
*encoder
;
236 drm_for_each_encoder(encoder
, dev
) {
237 encoder_funcs
= encoder
->helper_private
;
238 /* Disable unused encoders */
239 if (encoder
->crtc
== NULL
)
240 drm_encoder_disable(encoder
);
241 /* Disable encoders whose CRTC is about to change */
242 if (encoder_funcs
->get_crtc
&&
243 encoder
->crtc
!= (*encoder_funcs
->get_crtc
)(encoder
))
244 drm_encoder_disable(encoder
);
249 * drm_crtc_helper_set_mode - internal helper to set a mode
250 * @crtc: CRTC to program
252 * @x: horizontal offset into the surface
253 * @y: vertical offset into the surface
254 * @old_fb: old framebuffer, for cleanup
256 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
257 * to fixup or reject the mode prior to trying to set it. This is an internal
258 * helper that drivers could e.g. use to update properties that require the
259 * entire output pipe to be disabled and re-enabled in a new configuration. For
260 * example for changing whether audio is enabled on a hdmi link or for changing
261 * panel fitter or dither attributes. It is also called by the
262 * drm_crtc_helper_set_config() helper function to drive the mode setting
266 * True if the mode was set successfully, false otherwise.
268 bool drm_crtc_helper_set_mode(struct drm_crtc
*crtc
,
269 struct drm_display_mode
*mode
,
271 struct drm_framebuffer
*old_fb
)
273 struct drm_device
*dev
= crtc
->dev
;
274 struct drm_display_mode
*adjusted_mode
, saved_mode
, saved_hwmode
;
275 const struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
276 const struct drm_encoder_helper_funcs
*encoder_funcs
;
277 int saved_x
, saved_y
;
279 struct drm_encoder
*encoder
;
282 drm_warn_on_modeset_not_all_locked(dev
);
284 saved_enabled
= crtc
->enabled
;
285 crtc
->enabled
= drm_helper_crtc_in_use(crtc
);
289 adjusted_mode
= drm_mode_duplicate(dev
, mode
);
290 if (!adjusted_mode
) {
291 crtc
->enabled
= saved_enabled
;
295 saved_mode
= crtc
->mode
;
296 saved_hwmode
= crtc
->hwmode
;
300 /* Update crtc values up front so the driver can rely on them for mode
307 /* Pass our mode to the connectors and the CRTC to give them a chance to
308 * adjust it according to limitations or connector properties, and also
309 * a chance to reject the mode entirely.
311 drm_for_each_encoder(encoder
, dev
) {
313 if (encoder
->crtc
!= crtc
)
316 ret
= drm_bridge_mode_fixup(encoder
->bridge
,
317 mode
, adjusted_mode
);
319 DRM_DEBUG_KMS("Bridge fixup failed\n");
323 encoder_funcs
= encoder
->helper_private
;
324 if (!(ret
= encoder_funcs
->mode_fixup(encoder
, mode
,
326 DRM_DEBUG_KMS("Encoder fixup failed\n");
331 if (!(ret
= crtc_funcs
->mode_fixup(crtc
, mode
, adjusted_mode
))) {
332 DRM_DEBUG_KMS("CRTC fixup failed\n");
335 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc
->base
.id
);
337 crtc
->hwmode
= *adjusted_mode
;
339 /* Prepare the encoders and CRTCs before setting the mode. */
340 drm_for_each_encoder(encoder
, dev
) {
342 if (encoder
->crtc
!= crtc
)
345 drm_bridge_disable(encoder
->bridge
);
347 encoder_funcs
= encoder
->helper_private
;
348 /* Disable the encoders as the first thing we do. */
349 encoder_funcs
->prepare(encoder
);
351 drm_bridge_post_disable(encoder
->bridge
);
354 drm_crtc_prepare_encoders(dev
);
356 crtc_funcs
->prepare(crtc
);
358 /* Set up the DPLL and any encoders state that needs to adjust or depend
361 ret
= !crtc_funcs
->mode_set(crtc
, mode
, adjusted_mode
, x
, y
, old_fb
);
365 drm_for_each_encoder(encoder
, dev
) {
367 if (encoder
->crtc
!= crtc
)
370 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
371 encoder
->base
.id
, encoder
->name
,
372 mode
->base
.id
, mode
->name
);
373 encoder_funcs
= encoder
->helper_private
;
374 encoder_funcs
->mode_set(encoder
, mode
, adjusted_mode
);
376 drm_bridge_mode_set(encoder
->bridge
, mode
, adjusted_mode
);
379 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
380 crtc_funcs
->commit(crtc
);
382 drm_for_each_encoder(encoder
, dev
) {
384 if (encoder
->crtc
!= crtc
)
387 drm_bridge_pre_enable(encoder
->bridge
);
389 encoder_funcs
= encoder
->helper_private
;
390 encoder_funcs
->commit(encoder
);
392 drm_bridge_enable(encoder
->bridge
);
395 /* Calculate and store various constants which
396 * are later needed by vblank and swap-completion
397 * timestamping. They are derived from true hwmode.
399 drm_calc_timestamping_constants(crtc
, &crtc
->hwmode
);
401 /* FIXME: add subpixel order */
403 drm_mode_destroy(dev
, adjusted_mode
);
405 crtc
->enabled
= saved_enabled
;
406 crtc
->mode
= saved_mode
;
407 crtc
->hwmode
= saved_hwmode
;
414 EXPORT_SYMBOL(drm_crtc_helper_set_mode
);
417 drm_crtc_helper_disable(struct drm_crtc
*crtc
)
419 struct drm_device
*dev
= crtc
->dev
;
420 struct drm_connector
*connector
;
421 struct drm_encoder
*encoder
;
423 /* Decouple all encoders and their attached connectors from this crtc */
424 drm_for_each_encoder(encoder
, dev
) {
425 if (encoder
->crtc
!= crtc
)
428 drm_for_each_connector(connector
, dev
) {
429 if (connector
->encoder
!= encoder
)
432 connector
->encoder
= NULL
;
435 * drm_helper_disable_unused_functions() ought to be
436 * doing this, but since we've decoupled the encoder
437 * from the connector above, the required connection
438 * between them is henceforth no longer available.
440 connector
->dpms
= DRM_MODE_DPMS_OFF
;
444 __drm_helper_disable_unused_functions(dev
);
448 * drm_crtc_helper_set_config - set a new config from userspace
449 * @set: mode set configuration
451 * Setup a new configuration, provided by the upper layers (either an ioctl call
452 * from userspace or internally e.g. from the fbdev support code) in @set, and
453 * enable it. This is the main helper functions for drivers that implement
454 * kernel mode setting with the crtc helper functions and the assorted
455 * ->prepare(), ->modeset() and ->commit() helper callbacks.
458 * Returns 0 on success, negative errno numbers on failure.
460 int drm_crtc_helper_set_config(struct drm_mode_set
*set
)
462 struct drm_device
*dev
;
463 struct drm_crtc
*new_crtc
;
464 struct drm_encoder
*save_encoders
, *new_encoder
, *encoder
;
465 bool mode_changed
= false; /* if true do a full mode set */
466 bool fb_changed
= false; /* if true and !mode_changed just do a flip */
467 struct drm_connector
*save_connectors
, *connector
;
468 int count
= 0, ro
, fail
= 0;
469 const struct drm_crtc_helper_funcs
*crtc_funcs
;
470 struct drm_mode_set save_set
;
478 BUG_ON(!set
->crtc
->helper_private
);
480 /* Enforce sane interface api - has been abused by the fb helper. */
481 BUG_ON(!set
->mode
&& set
->fb
);
482 BUG_ON(set
->fb
&& set
->num_connectors
== 0);
484 crtc_funcs
= set
->crtc
->helper_private
;
490 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
491 set
->crtc
->base
.id
, set
->fb
->base
.id
,
492 (int)set
->num_connectors
, set
->x
, set
->y
);
494 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set
->crtc
->base
.id
);
495 drm_crtc_helper_disable(set
->crtc
);
499 dev
= set
->crtc
->dev
;
501 drm_warn_on_modeset_not_all_locked(dev
);
504 * Allocate space for the backup of all (non-pointer) encoder and
507 save_encoders
= kzalloc(dev
->mode_config
.num_encoder
*
508 sizeof(struct drm_encoder
), GFP_KERNEL
);
512 save_connectors
= kzalloc(dev
->mode_config
.num_connector
*
513 sizeof(struct drm_connector
), GFP_KERNEL
);
514 if (!save_connectors
) {
515 kfree(save_encoders
);
520 * Copy data. Note that driver private data is not affected.
521 * Should anything bad happen only the expected state is
522 * restored, not the drivers personal bookkeeping.
525 drm_for_each_encoder(encoder
, dev
) {
526 save_encoders
[count
++] = *encoder
;
530 drm_for_each_connector(connector
, dev
) {
531 save_connectors
[count
++] = *connector
;
534 save_set
.crtc
= set
->crtc
;
535 save_set
.mode
= &set
->crtc
->mode
;
536 save_set
.x
= set
->crtc
->x
;
537 save_set
.y
= set
->crtc
->y
;
538 save_set
.fb
= set
->crtc
->primary
->fb
;
540 /* We should be able to check here if the fb has the same properties
541 * and then just flip_or_move it */
542 if (set
->crtc
->primary
->fb
!= set
->fb
) {
543 /* If we have no fb then treat it as a full mode set */
544 if (set
->crtc
->primary
->fb
== NULL
) {
545 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
547 } else if (set
->fb
== NULL
) {
549 } else if (set
->fb
->pixel_format
!=
550 set
->crtc
->primary
->fb
->pixel_format
) {
556 if (set
->x
!= set
->crtc
->x
|| set
->y
!= set
->crtc
->y
)
559 if (set
->mode
&& !drm_mode_equal(set
->mode
, &set
->crtc
->mode
)) {
560 DRM_DEBUG_KMS("modes are different, full mode set\n");
561 drm_mode_debug_printmodeline(&set
->crtc
->mode
);
562 drm_mode_debug_printmodeline(set
->mode
);
566 /* a) traverse passed in connector list and get encoders for them */
568 drm_for_each_connector(connector
, dev
) {
569 const struct drm_connector_helper_funcs
*connector_funcs
=
570 connector
->helper_private
;
571 new_encoder
= connector
->encoder
;
572 for (ro
= 0; ro
< set
->num_connectors
; ro
++) {
573 if (set
->connectors
[ro
] == connector
) {
574 new_encoder
= connector_funcs
->best_encoder(connector
);
575 /* if we can't get an encoder for a connector
576 we are setting now - then fail */
577 if (new_encoder
== NULL
)
578 /* don't break so fail path works correct */
581 if (connector
->dpms
!= DRM_MODE_DPMS_ON
) {
582 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
590 if (new_encoder
!= connector
->encoder
) {
591 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
593 /* If the encoder is reused for another connector, then
594 * the appropriate crtc will be set later.
596 if (connector
->encoder
)
597 connector
->encoder
->crtc
= NULL
;
598 connector
->encoder
= new_encoder
;
608 drm_for_each_connector(connector
, dev
) {
609 if (!connector
->encoder
)
612 if (connector
->encoder
->crtc
== set
->crtc
)
615 new_crtc
= connector
->encoder
->crtc
;
617 for (ro
= 0; ro
< set
->num_connectors
; ro
++) {
618 if (set
->connectors
[ro
] == connector
)
619 new_crtc
= set
->crtc
;
622 /* Make sure the new CRTC will work with the encoder */
624 !drm_encoder_crtc_ok(connector
->encoder
, new_crtc
)) {
628 if (new_crtc
!= connector
->encoder
->crtc
) {
629 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
631 connector
->encoder
->crtc
= new_crtc
;
634 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
635 connector
->base
.id
, connector
->name
,
638 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
639 connector
->base
.id
, connector
->name
);
643 /* mode_set_base is not a required function */
644 if (fb_changed
&& !crtc_funcs
->mode_set_base
)
648 if (drm_helper_crtc_in_use(set
->crtc
)) {
649 DRM_DEBUG_KMS("attempting to set mode from"
651 drm_mode_debug_printmodeline(set
->mode
);
652 set
->crtc
->primary
->fb
= set
->fb
;
653 if (!drm_crtc_helper_set_mode(set
->crtc
, set
->mode
,
656 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
658 set
->crtc
->primary
->fb
= save_set
.fb
;
662 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
663 for (i
= 0; i
< set
->num_connectors
; i
++) {
664 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set
->connectors
[i
]->base
.id
,
665 set
->connectors
[i
]->name
);
666 set
->connectors
[i
]->funcs
->dpms(set
->connectors
[i
], DRM_MODE_DPMS_ON
);
669 __drm_helper_disable_unused_functions(dev
);
670 } else if (fb_changed
) {
671 set
->crtc
->x
= set
->x
;
672 set
->crtc
->y
= set
->y
;
673 set
->crtc
->primary
->fb
= set
->fb
;
674 ret
= crtc_funcs
->mode_set_base(set
->crtc
,
675 set
->x
, set
->y
, save_set
.fb
);
677 set
->crtc
->x
= save_set
.x
;
678 set
->crtc
->y
= save_set
.y
;
679 set
->crtc
->primary
->fb
= save_set
.fb
;
684 kfree(save_connectors
);
685 kfree(save_encoders
);
689 /* Restore all previous data. */
691 drm_for_each_encoder(encoder
, dev
) {
692 *encoder
= save_encoders
[count
++];
696 drm_for_each_connector(connector
, dev
) {
697 *connector
= save_connectors
[count
++];
700 /* Try to restore the config */
702 !drm_crtc_helper_set_mode(save_set
.crtc
, save_set
.mode
, save_set
.x
,
703 save_set
.y
, save_set
.fb
))
704 DRM_ERROR("failed to restore config after modeset failure\n");
706 kfree(save_connectors
);
707 kfree(save_encoders
);
710 EXPORT_SYMBOL(drm_crtc_helper_set_config
);
712 static int drm_helper_choose_encoder_dpms(struct drm_encoder
*encoder
)
714 int dpms
= DRM_MODE_DPMS_OFF
;
715 struct drm_connector
*connector
;
716 struct drm_device
*dev
= encoder
->dev
;
718 drm_for_each_connector(connector
, dev
)
719 if (connector
->encoder
== encoder
)
720 if (connector
->dpms
< dpms
)
721 dpms
= connector
->dpms
;
725 /* Helper which handles bridge ordering around encoder dpms */
726 static void drm_helper_encoder_dpms(struct drm_encoder
*encoder
, int mode
)
728 struct drm_bridge
*bridge
= encoder
->bridge
;
729 const struct drm_encoder_helper_funcs
*encoder_funcs
;
731 if (mode
== DRM_MODE_DPMS_ON
)
732 drm_bridge_pre_enable(bridge
);
734 drm_bridge_disable(bridge
);
736 encoder_funcs
= encoder
->helper_private
;
737 if (encoder_funcs
->dpms
)
738 encoder_funcs
->dpms(encoder
, mode
);
740 if (mode
== DRM_MODE_DPMS_ON
)
741 drm_bridge_enable(bridge
);
743 drm_bridge_post_disable(bridge
);
746 static int drm_helper_choose_crtc_dpms(struct drm_crtc
*crtc
)
748 int dpms
= DRM_MODE_DPMS_OFF
;
749 struct drm_connector
*connector
;
750 struct drm_device
*dev
= crtc
->dev
;
752 drm_for_each_connector(connector
, dev
)
753 if (connector
->encoder
&& connector
->encoder
->crtc
== crtc
)
754 if (connector
->dpms
< dpms
)
755 dpms
= connector
->dpms
;
760 * drm_helper_connector_dpms() - connector dpms helper implementation
761 * @connector: affected connector
764 * This is the main helper function provided by the crtc helper framework for
765 * implementing the DPMS connector attribute. It computes the new desired DPMS
766 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
767 * callback provided by the driver appropriately.
772 int drm_helper_connector_dpms(struct drm_connector
*connector
, int mode
)
774 struct drm_encoder
*encoder
= connector
->encoder
;
775 struct drm_crtc
*crtc
= encoder
? encoder
->crtc
: NULL
;
776 int old_dpms
, encoder_dpms
= DRM_MODE_DPMS_OFF
;
778 if (mode
== connector
->dpms
)
781 old_dpms
= connector
->dpms
;
782 connector
->dpms
= mode
;
785 encoder_dpms
= drm_helper_choose_encoder_dpms(encoder
);
787 /* from off to on, do crtc then encoder */
788 if (mode
< old_dpms
) {
790 const struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
791 if (crtc_funcs
->dpms
)
792 (*crtc_funcs
->dpms
) (crtc
,
793 drm_helper_choose_crtc_dpms(crtc
));
796 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
799 /* from on to off, do encoder then crtc */
800 if (mode
> old_dpms
) {
802 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
804 const struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
805 if (crtc_funcs
->dpms
)
806 (*crtc_funcs
->dpms
) (crtc
,
807 drm_helper_choose_crtc_dpms(crtc
));
813 EXPORT_SYMBOL(drm_helper_connector_dpms
);
816 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
817 * @fb: drm_framebuffer object to fill out
818 * @mode_cmd: metadata from the userspace fb creation request
820 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
823 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer
*fb
,
824 struct drm_mode_fb_cmd2
*mode_cmd
)
828 fb
->width
= mode_cmd
->width
;
829 fb
->height
= mode_cmd
->height
;
830 for (i
= 0; i
< 4; i
++) {
831 fb
->pitches
[i
] = mode_cmd
->pitches
[i
];
832 fb
->offsets
[i
] = mode_cmd
->offsets
[i
];
833 fb
->modifier
[i
] = mode_cmd
->modifier
[i
];
835 drm_fb_get_bpp_depth(mode_cmd
->pixel_format
, &fb
->depth
,
836 &fb
->bits_per_pixel
);
837 fb
->pixel_format
= mode_cmd
->pixel_format
;
838 fb
->flags
= mode_cmd
->flags
;
840 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct
);
843 * drm_helper_resume_force_mode - force-restore mode setting configuration
844 * @dev: drm_device which should be restored
846 * Drivers which use the mode setting helpers can use this function to
847 * force-restore the mode setting configuration e.g. on resume or when something
848 * else might have trampled over the hw state (like some overzealous old BIOSen
851 * This helper doesn't provide a error return value since restoring the old
852 * config should never fail due to resource allocation issues since the driver
853 * has successfully set the restored configuration already. Hence this should
854 * boil down to the equivalent of a few dpms on calls, which also don't provide
857 * Drivers where simply restoring an old configuration again might fail (e.g.
858 * due to slight differences in allocating shared resources when the
859 * configuration is restored in a different order than when userspace set it up)
860 * need to use their own restore logic.
862 void drm_helper_resume_force_mode(struct drm_device
*dev
)
864 struct drm_crtc
*crtc
;
865 struct drm_encoder
*encoder
;
866 const struct drm_crtc_helper_funcs
*crtc_funcs
;
870 drm_modeset_lock_all(dev
);
871 drm_for_each_crtc(crtc
, dev
) {
876 ret
= drm_crtc_helper_set_mode(crtc
, &crtc
->mode
,
877 crtc
->x
, crtc
->y
, crtc
->primary
->fb
);
879 /* Restoring the old config should never fail! */
881 DRM_ERROR("failed to set mode on crtc %p\n", crtc
);
883 /* Turn off outputs that were already powered off */
884 if (drm_helper_choose_crtc_dpms(crtc
)) {
885 drm_for_each_encoder(encoder
, dev
) {
887 if(encoder
->crtc
!= crtc
)
890 encoder_dpms
= drm_helper_choose_encoder_dpms(
893 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
896 crtc_funcs
= crtc
->helper_private
;
897 if (crtc_funcs
->dpms
)
898 (*crtc_funcs
->dpms
) (crtc
,
899 drm_helper_choose_crtc_dpms(crtc
));
903 /* disable the unused connectors while restoring the modesetting */
904 __drm_helper_disable_unused_functions(dev
);
905 drm_modeset_unlock_all(dev
);
907 EXPORT_SYMBOL(drm_helper_resume_force_mode
);
910 * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers
912 * @mode: DRM display mode which userspace requested
913 * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks
914 * @x: x offset of the CRTC scanout area on the underlying framebuffer
915 * @y: y offset of the CRTC scanout area on the underlying framebuffer
916 * @old_fb: previous framebuffer
918 * This function implements a callback useable as the ->mode_set callback
919 * required by the crtc helpers. Besides the atomic plane helper functions for
920 * the primary plane the driver must also provide the ->mode_set_nofb callback
921 * to set up the crtc.
923 * This is a transitional helper useful for converting drivers to the atomic
926 int drm_helper_crtc_mode_set(struct drm_crtc
*crtc
, struct drm_display_mode
*mode
,
927 struct drm_display_mode
*adjusted_mode
, int x
, int y
,
928 struct drm_framebuffer
*old_fb
)
930 struct drm_crtc_state
*crtc_state
;
931 const struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
934 if (crtc
->funcs
->atomic_duplicate_state
)
935 crtc_state
= crtc
->funcs
->atomic_duplicate_state(crtc
);
937 crtc_state
= kzalloc(sizeof(*crtc_state
), GFP_KERNEL
);
941 __drm_atomic_helper_crtc_duplicate_state(crtc
, crtc_state
);
943 crtc_state
->crtc
= crtc
;
946 crtc_state
->planes_changed
= true;
947 crtc_state
->mode_changed
= true;
948 ret
= drm_atomic_set_mode_for_crtc(crtc_state
, mode
);
951 drm_mode_copy(&crtc_state
->adjusted_mode
, adjusted_mode
);
953 if (crtc_funcs
->atomic_check
) {
954 ret
= crtc_funcs
->atomic_check(crtc
, crtc_state
);
959 swap(crtc
->state
, crtc_state
);
961 crtc_funcs
->mode_set_nofb(crtc
);
963 ret
= drm_helper_crtc_mode_set_base(crtc
, x
, y
, old_fb
);
966 if (crtc
->funcs
->atomic_destroy_state
)
967 crtc
->funcs
->atomic_destroy_state(crtc
, crtc_state
);
969 __drm_atomic_helper_crtc_destroy_state(crtc
, crtc_state
);
975 EXPORT_SYMBOL(drm_helper_crtc_mode_set
);
978 * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers
980 * @x: x offset of the CRTC scanout area on the underlying framebuffer
981 * @y: y offset of the CRTC scanout area on the underlying framebuffer
982 * @old_fb: previous framebuffer
984 * This function implements a callback useable as the ->mode_set_base used
985 * required by the crtc helpers. The driver must provide the atomic plane helper
986 * functions for the primary plane.
988 * This is a transitional helper useful for converting drivers to the atomic
991 int drm_helper_crtc_mode_set_base(struct drm_crtc
*crtc
, int x
, int y
,
992 struct drm_framebuffer
*old_fb
)
994 struct drm_plane_state
*plane_state
;
995 struct drm_plane
*plane
= crtc
->primary
;
997 if (plane
->funcs
->atomic_duplicate_state
)
998 plane_state
= plane
->funcs
->atomic_duplicate_state(plane
);
999 else if (plane
->state
)
1000 plane_state
= drm_atomic_helper_plane_duplicate_state(plane
);
1002 plane_state
= kzalloc(sizeof(*plane_state
), GFP_KERNEL
);
1005 plane_state
->plane
= plane
;
1007 plane_state
->crtc
= crtc
;
1008 drm_atomic_set_fb_for_plane(plane_state
, crtc
->primary
->fb
);
1009 plane_state
->crtc_x
= 0;
1010 plane_state
->crtc_y
= 0;
1011 plane_state
->crtc_h
= crtc
->mode
.vdisplay
;
1012 plane_state
->crtc_w
= crtc
->mode
.hdisplay
;
1013 plane_state
->src_x
= x
<< 16;
1014 plane_state
->src_y
= y
<< 16;
1015 plane_state
->src_h
= crtc
->mode
.vdisplay
<< 16;
1016 plane_state
->src_w
= crtc
->mode
.hdisplay
<< 16;
1018 return drm_plane_helper_commit(plane
, plane_state
, old_fb
);
1020 EXPORT_SYMBOL(drm_helper_crtc_mode_set_base
);