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 <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");
68 MODULE_LICENSE("GPL and additional rights");
71 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
73 * @dev: drm device to operate on
75 * Some userspace presumes that the first connected connector is the main
76 * display, where it's supposed to display e.g. the login screen. For
77 * laptops, this should be the main panel. Use this function to sort all
78 * (eDP/LVDS) panels to the front of the connector list, instead of
79 * painstakingly trying to initialize them in the right order.
81 void drm_helper_move_panel_connectors_to_head(struct drm_device
*dev
)
83 struct drm_connector
*connector
, *tmp
;
84 struct list_head panel_list
;
86 INIT_LIST_HEAD(&panel_list
);
88 list_for_each_entry_safe(connector
, tmp
,
89 &dev
->mode_config
.connector_list
, head
) {
90 if (connector
->connector_type
== DRM_MODE_CONNECTOR_LVDS
||
91 connector
->connector_type
== DRM_MODE_CONNECTOR_eDP
)
92 list_move_tail(&connector
->head
, &panel_list
);
95 list_splice(&panel_list
, &dev
->mode_config
.connector_list
);
97 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head
);
100 * drm_helper_encoder_in_use - check if a given encoder is in use
101 * @encoder: encoder to check
103 * Checks whether @encoder is with the current mode setting output configuration
104 * in use by any connector. This doesn't mean that it is actually enabled since
105 * the DPMS state is tracked separately.
108 * True if @encoder is used, false otherwise.
110 bool drm_helper_encoder_in_use(struct drm_encoder
*encoder
)
112 struct drm_connector
*connector
;
113 struct drm_device
*dev
= encoder
->dev
;
116 * We can expect this mutex to be locked if we are not panicking.
117 * 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
));
124 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
125 if (connector
->encoder
== encoder
)
129 EXPORT_SYMBOL(drm_helper_encoder_in_use
);
132 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
133 * @crtc: CRTC to check
135 * Checks whether @crtc is with the current mode setting output configuration
136 * in use by any connector. This doesn't mean that it is actually enabled since
137 * the DPMS state is tracked separately.
140 * True if @crtc is used, false otherwise.
142 bool drm_helper_crtc_in_use(struct drm_crtc
*crtc
)
144 struct drm_encoder
*encoder
;
145 struct drm_device
*dev
= crtc
->dev
;
148 * We can expect this mutex to be locked if we are not panicking.
149 * Locking is currently fubar in the panic handler.
151 if (!oops_in_progress
)
152 WARN_ON(!mutex_is_locked(&dev
->mode_config
.mutex
));
154 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
)
155 if (encoder
->crtc
== crtc
&& drm_helper_encoder_in_use(encoder
))
159 EXPORT_SYMBOL(drm_helper_crtc_in_use
);
162 drm_encoder_disable(struct drm_encoder
*encoder
)
164 struct drm_encoder_helper_funcs
*encoder_funcs
= encoder
->helper_private
;
167 encoder
->bridge
->funcs
->disable(encoder
->bridge
);
169 if (encoder_funcs
->disable
)
170 (*encoder_funcs
->disable
)(encoder
);
172 (*encoder_funcs
->dpms
)(encoder
, DRM_MODE_DPMS_OFF
);
175 encoder
->bridge
->funcs
->post_disable(encoder
->bridge
);
178 static void __drm_helper_disable_unused_functions(struct drm_device
*dev
)
180 struct drm_encoder
*encoder
;
181 struct drm_crtc
*crtc
;
183 drm_warn_on_modeset_not_all_locked(dev
);
185 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
186 if (!drm_helper_encoder_in_use(encoder
)) {
187 drm_encoder_disable(encoder
);
188 /* disconnect encoder from any connector */
189 encoder
->crtc
= NULL
;
193 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
194 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
195 crtc
->enabled
= drm_helper_crtc_in_use(crtc
);
196 if (!crtc
->enabled
) {
197 if (crtc_funcs
->disable
)
198 (*crtc_funcs
->disable
)(crtc
);
200 (*crtc_funcs
->dpms
)(crtc
, DRM_MODE_DPMS_OFF
);
201 crtc
->primary
->fb
= NULL
;
207 * drm_helper_disable_unused_functions - disable unused objects
210 * This function walks through the entire mode setting configuration of @dev. It
211 * will remove any crtc links of unused encoders and encoder links of
212 * disconnected connectors. Then it will disable all unused encoders and crtcs
213 * either by calling their disable callback if available or by calling their
214 * dpms callback with DRM_MODE_DPMS_OFF.
216 void drm_helper_disable_unused_functions(struct drm_device
*dev
)
218 drm_modeset_lock_all(dev
);
219 __drm_helper_disable_unused_functions(dev
);
220 drm_modeset_unlock_all(dev
);
222 EXPORT_SYMBOL(drm_helper_disable_unused_functions
);
225 * Check the CRTC we're going to map each output to vs. its current
226 * CRTC. If they don't match, we have to disable the output and the CRTC
227 * since the driver will have to re-route things.
230 drm_crtc_prepare_encoders(struct drm_device
*dev
)
232 struct drm_encoder_helper_funcs
*encoder_funcs
;
233 struct drm_encoder
*encoder
;
235 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
236 encoder_funcs
= encoder
->helper_private
;
237 /* Disable unused encoders */
238 if (encoder
->crtc
== NULL
)
239 drm_encoder_disable(encoder
);
240 /* Disable encoders whose CRTC is about to change */
241 if (encoder_funcs
->get_crtc
&&
242 encoder
->crtc
!= (*encoder_funcs
->get_crtc
)(encoder
))
243 drm_encoder_disable(encoder
);
248 * drm_crtc_helper_set_mode - internal helper to set a mode
249 * @crtc: CRTC to program
251 * @x: horizontal offset into the surface
252 * @y: vertical offset into the surface
253 * @old_fb: old framebuffer, for cleanup
255 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
256 * to fixup or reject the mode prior to trying to set it. This is an internal
257 * helper that drivers could e.g. use to update properties that require the
258 * entire output pipe to be disabled and re-enabled in a new configuration. For
259 * example for changing whether audio is enabled on a hdmi link or for changing
260 * panel fitter or dither attributes. It is also called by the
261 * drm_crtc_helper_set_config() helper function to drive the mode setting
265 * True if the mode was set successfully, false otherwise.
267 bool drm_crtc_helper_set_mode(struct drm_crtc
*crtc
,
268 struct drm_display_mode
*mode
,
270 struct drm_framebuffer
*old_fb
)
272 struct drm_device
*dev
= crtc
->dev
;
273 struct drm_display_mode
*adjusted_mode
, saved_mode
;
274 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
275 struct drm_encoder_helper_funcs
*encoder_funcs
;
276 int saved_x
, saved_y
;
278 struct drm_encoder
*encoder
;
281 drm_warn_on_modeset_not_all_locked(dev
);
283 saved_enabled
= crtc
->enabled
;
284 crtc
->enabled
= drm_helper_crtc_in_use(crtc
);
288 adjusted_mode
= drm_mode_duplicate(dev
, mode
);
289 if (!adjusted_mode
) {
290 crtc
->enabled
= saved_enabled
;
294 saved_mode
= crtc
->mode
;
298 /* Update crtc values up front so the driver can rely on them for mode
305 /* Pass our mode to the connectors and the CRTC to give them a chance to
306 * adjust it according to limitations or connector properties, and also
307 * a chance to reject the mode entirely.
309 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
311 if (encoder
->crtc
!= crtc
)
314 if (encoder
->bridge
&& encoder
->bridge
->funcs
->mode_fixup
) {
315 ret
= encoder
->bridge
->funcs
->mode_fixup(
316 encoder
->bridge
, mode
, adjusted_mode
);
318 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 /* Prepare the encoders and CRTCs before setting the mode. */
338 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
340 if (encoder
->crtc
!= crtc
)
344 encoder
->bridge
->funcs
->disable(encoder
->bridge
);
346 encoder_funcs
= encoder
->helper_private
;
347 /* Disable the encoders as the first thing we do. */
348 encoder_funcs
->prepare(encoder
);
351 encoder
->bridge
->funcs
->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 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
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 if (encoder
->bridge
&& encoder
->bridge
->funcs
->mode_set
)
377 encoder
->bridge
->funcs
->mode_set(encoder
->bridge
, mode
,
381 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
382 crtc_funcs
->commit(crtc
);
384 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
386 if (encoder
->crtc
!= crtc
)
390 encoder
->bridge
->funcs
->pre_enable(encoder
->bridge
);
392 encoder_funcs
= encoder
->helper_private
;
393 encoder_funcs
->commit(encoder
);
396 encoder
->bridge
->funcs
->enable(encoder
->bridge
);
399 /* Store real post-adjustment hardware mode. */
400 crtc
->hwmode
= *adjusted_mode
;
402 /* Calculate and store various constants which
403 * are later needed by vblank and swap-completion
404 * timestamping. They are derived from true hwmode.
406 drm_calc_timestamping_constants(crtc
, &crtc
->hwmode
);
408 /* FIXME: add subpixel order */
410 drm_mode_destroy(dev
, adjusted_mode
);
412 crtc
->enabled
= saved_enabled
;
413 crtc
->mode
= saved_mode
;
420 EXPORT_SYMBOL(drm_crtc_helper_set_mode
);
423 drm_crtc_helper_disable(struct drm_crtc
*crtc
)
425 struct drm_device
*dev
= crtc
->dev
;
426 struct drm_connector
*connector
;
427 struct drm_encoder
*encoder
;
429 /* Decouple all encoders and their attached connectors from this crtc */
430 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
431 if (encoder
->crtc
!= crtc
)
434 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
435 if (connector
->encoder
!= encoder
)
438 connector
->encoder
= NULL
;
441 * drm_helper_disable_unused_functions() ought to be
442 * doing this, but since we've decoupled the encoder
443 * from the connector above, the required connection
444 * between them is henceforth no longer available.
446 connector
->dpms
= DRM_MODE_DPMS_OFF
;
450 __drm_helper_disable_unused_functions(dev
);
454 * drm_crtc_helper_set_config - set a new config from userspace
455 * @set: mode set configuration
457 * Setup a new configuration, provided by the upper layers (either an ioctl call
458 * from userspace or internally e.g. from the fbdev support code) in @set, and
459 * enable it. This is the main helper functions for drivers that implement
460 * kernel mode setting with the crtc helper functions and the assorted
461 * ->prepare(), ->modeset() and ->commit() helper callbacks.
464 * Returns 0 on success, negative errno numbers on failure.
466 int drm_crtc_helper_set_config(struct drm_mode_set
*set
)
468 struct drm_device
*dev
;
469 struct drm_crtc
*new_crtc
;
470 struct drm_encoder
*save_encoders
, *new_encoder
, *encoder
;
471 bool mode_changed
= false; /* if true do a full mode set */
472 bool fb_changed
= false; /* if true and !mode_changed just do a flip */
473 struct drm_connector
*save_connectors
, *connector
;
474 int count
= 0, ro
, fail
= 0;
475 struct drm_crtc_helper_funcs
*crtc_funcs
;
476 struct drm_mode_set save_set
;
484 BUG_ON(!set
->crtc
->helper_private
);
486 /* Enforce sane interface api - has been abused by the fb helper. */
487 BUG_ON(!set
->mode
&& set
->fb
);
488 BUG_ON(set
->fb
&& set
->num_connectors
== 0);
490 crtc_funcs
= set
->crtc
->helper_private
;
496 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
497 set
->crtc
->base
.id
, set
->fb
->base
.id
,
498 (int)set
->num_connectors
, set
->x
, set
->y
);
500 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set
->crtc
->base
.id
);
501 drm_crtc_helper_disable(set
->crtc
);
505 dev
= set
->crtc
->dev
;
507 drm_warn_on_modeset_not_all_locked(dev
);
510 * Allocate space for the backup of all (non-pointer) encoder and
513 save_encoders
= kzalloc(dev
->mode_config
.num_encoder
*
514 sizeof(struct drm_encoder
), GFP_KERNEL
);
518 save_connectors
= kzalloc(dev
->mode_config
.num_connector
*
519 sizeof(struct drm_connector
), GFP_KERNEL
);
520 if (!save_connectors
) {
521 kfree(save_encoders
);
526 * Copy data. Note that driver private data is not affected.
527 * Should anything bad happen only the expected state is
528 * restored, not the drivers personal bookkeeping.
531 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
532 save_encoders
[count
++] = *encoder
;
536 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
537 save_connectors
[count
++] = *connector
;
540 save_set
.crtc
= set
->crtc
;
541 save_set
.mode
= &set
->crtc
->mode
;
542 save_set
.x
= set
->crtc
->x
;
543 save_set
.y
= set
->crtc
->y
;
544 save_set
.fb
= set
->crtc
->primary
->fb
;
546 /* We should be able to check here if the fb has the same properties
547 * and then just flip_or_move it */
548 if (set
->crtc
->primary
->fb
!= set
->fb
) {
549 /* If we have no fb then treat it as a full mode set */
550 if (set
->crtc
->primary
->fb
== NULL
) {
551 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
553 } else if (set
->fb
== NULL
) {
555 } else if (set
->fb
->pixel_format
!=
556 set
->crtc
->primary
->fb
->pixel_format
) {
562 if (set
->x
!= set
->crtc
->x
|| set
->y
!= set
->crtc
->y
)
565 if (set
->mode
&& !drm_mode_equal(set
->mode
, &set
->crtc
->mode
)) {
566 DRM_DEBUG_KMS("modes are different, full mode set\n");
567 drm_mode_debug_printmodeline(&set
->crtc
->mode
);
568 drm_mode_debug_printmodeline(set
->mode
);
572 /* a) traverse passed in connector list and get encoders for them */
574 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
575 struct drm_connector_helper_funcs
*connector_funcs
=
576 connector
->helper_private
;
577 new_encoder
= connector
->encoder
;
578 for (ro
= 0; ro
< set
->num_connectors
; ro
++) {
579 if (set
->connectors
[ro
] == connector
) {
580 new_encoder
= connector_funcs
->best_encoder(connector
);
581 /* if we can't get an encoder for a connector
582 we are setting now - then fail */
583 if (new_encoder
== NULL
)
584 /* don't break so fail path works correct */
587 if (connector
->dpms
!= DRM_MODE_DPMS_ON
) {
588 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
596 if (new_encoder
!= connector
->encoder
) {
597 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
599 /* If the encoder is reused for another connector, then
600 * the appropriate crtc will be set later.
602 if (connector
->encoder
)
603 connector
->encoder
->crtc
= NULL
;
604 connector
->encoder
= new_encoder
;
614 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
615 if (!connector
->encoder
)
618 if (connector
->encoder
->crtc
== set
->crtc
)
621 new_crtc
= connector
->encoder
->crtc
;
623 for (ro
= 0; ro
< set
->num_connectors
; ro
++) {
624 if (set
->connectors
[ro
] == connector
)
625 new_crtc
= set
->crtc
;
628 /* Make sure the new CRTC will work with the encoder */
630 !drm_encoder_crtc_ok(connector
->encoder
, new_crtc
)) {
634 if (new_crtc
!= connector
->encoder
->crtc
) {
635 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
637 connector
->encoder
->crtc
= new_crtc
;
640 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
641 connector
->base
.id
, connector
->name
,
644 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
645 connector
->base
.id
, connector
->name
);
649 /* mode_set_base is not a required function */
650 if (fb_changed
&& !crtc_funcs
->mode_set_base
)
654 if (drm_helper_crtc_in_use(set
->crtc
)) {
655 DRM_DEBUG_KMS("attempting to set mode from"
657 drm_mode_debug_printmodeline(set
->mode
);
658 set
->crtc
->primary
->fb
= set
->fb
;
659 if (!drm_crtc_helper_set_mode(set
->crtc
, set
->mode
,
662 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
664 set
->crtc
->primary
->fb
= save_set
.fb
;
668 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
669 for (i
= 0; i
< set
->num_connectors
; i
++) {
670 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set
->connectors
[i
]->base
.id
,
671 set
->connectors
[i
]->name
);
672 set
->connectors
[i
]->funcs
->dpms(set
->connectors
[i
], DRM_MODE_DPMS_ON
);
675 __drm_helper_disable_unused_functions(dev
);
676 } else if (fb_changed
) {
677 set
->crtc
->x
= set
->x
;
678 set
->crtc
->y
= set
->y
;
679 set
->crtc
->primary
->fb
= set
->fb
;
680 ret
= crtc_funcs
->mode_set_base(set
->crtc
,
681 set
->x
, set
->y
, save_set
.fb
);
683 set
->crtc
->x
= save_set
.x
;
684 set
->crtc
->y
= save_set
.y
;
685 set
->crtc
->primary
->fb
= save_set
.fb
;
690 kfree(save_connectors
);
691 kfree(save_encoders
);
695 /* Restore all previous data. */
697 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
698 *encoder
= save_encoders
[count
++];
702 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
703 *connector
= save_connectors
[count
++];
706 /* Try to restore the config */
708 !drm_crtc_helper_set_mode(save_set
.crtc
, save_set
.mode
, save_set
.x
,
709 save_set
.y
, save_set
.fb
))
710 DRM_ERROR("failed to restore config after modeset failure\n");
712 kfree(save_connectors
);
713 kfree(save_encoders
);
716 EXPORT_SYMBOL(drm_crtc_helper_set_config
);
718 static int drm_helper_choose_encoder_dpms(struct drm_encoder
*encoder
)
720 int dpms
= DRM_MODE_DPMS_OFF
;
721 struct drm_connector
*connector
;
722 struct drm_device
*dev
= encoder
->dev
;
724 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
725 if (connector
->encoder
== encoder
)
726 if (connector
->dpms
< dpms
)
727 dpms
= connector
->dpms
;
731 /* Helper which handles bridge ordering around encoder dpms */
732 static void drm_helper_encoder_dpms(struct drm_encoder
*encoder
, int mode
)
734 struct drm_bridge
*bridge
= encoder
->bridge
;
735 struct drm_encoder_helper_funcs
*encoder_funcs
;
738 if (mode
== DRM_MODE_DPMS_ON
)
739 bridge
->funcs
->pre_enable(bridge
);
741 bridge
->funcs
->disable(bridge
);
744 encoder_funcs
= encoder
->helper_private
;
745 if (encoder_funcs
->dpms
)
746 encoder_funcs
->dpms(encoder
, mode
);
749 if (mode
== DRM_MODE_DPMS_ON
)
750 bridge
->funcs
->enable(bridge
);
752 bridge
->funcs
->post_disable(bridge
);
756 static int drm_helper_choose_crtc_dpms(struct drm_crtc
*crtc
)
758 int dpms
= DRM_MODE_DPMS_OFF
;
759 struct drm_connector
*connector
;
760 struct drm_device
*dev
= crtc
->dev
;
762 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
763 if (connector
->encoder
&& connector
->encoder
->crtc
== crtc
)
764 if (connector
->dpms
< dpms
)
765 dpms
= connector
->dpms
;
770 * drm_helper_connector_dpms() - connector dpms helper implementation
771 * @connector: affected connector
774 * This is the main helper function provided by the crtc helper framework for
775 * implementing the DPMS connector attribute. It computes the new desired DPMS
776 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
777 * callback provided by the driver appropriately.
779 void drm_helper_connector_dpms(struct drm_connector
*connector
, int mode
)
781 struct drm_encoder
*encoder
= connector
->encoder
;
782 struct drm_crtc
*crtc
= encoder
? encoder
->crtc
: NULL
;
783 int old_dpms
, encoder_dpms
= DRM_MODE_DPMS_OFF
;
785 if (mode
== connector
->dpms
)
788 old_dpms
= connector
->dpms
;
789 connector
->dpms
= mode
;
792 encoder_dpms
= drm_helper_choose_encoder_dpms(encoder
);
794 /* from off to on, do crtc then encoder */
795 if (mode
< old_dpms
) {
797 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
798 if (crtc_funcs
->dpms
)
799 (*crtc_funcs
->dpms
) (crtc
,
800 drm_helper_choose_crtc_dpms(crtc
));
803 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
806 /* from on to off, do encoder then crtc */
807 if (mode
> old_dpms
) {
809 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
811 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
812 if (crtc_funcs
->dpms
)
813 (*crtc_funcs
->dpms
) (crtc
,
814 drm_helper_choose_crtc_dpms(crtc
));
820 EXPORT_SYMBOL(drm_helper_connector_dpms
);
823 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
824 * @fb: drm_framebuffer object to fill out
825 * @mode_cmd: metadata from the userspace fb creation request
827 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
830 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer
*fb
,
831 struct drm_mode_fb_cmd2
*mode_cmd
)
835 fb
->width
= mode_cmd
->width
;
836 fb
->height
= mode_cmd
->height
;
837 for (i
= 0; i
< 4; i
++) {
838 fb
->pitches
[i
] = mode_cmd
->pitches
[i
];
839 fb
->offsets
[i
] = mode_cmd
->offsets
[i
];
841 drm_fb_get_bpp_depth(mode_cmd
->pixel_format
, &fb
->depth
,
842 &fb
->bits_per_pixel
);
843 fb
->pixel_format
= mode_cmd
->pixel_format
;
844 fb
->flags
= mode_cmd
->flags
;
846 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct
);
849 * drm_helper_resume_force_mode - force-restore mode setting configuration
850 * @dev: drm_device which should be restored
852 * Drivers which use the mode setting helpers can use this function to
853 * force-restore the mode setting configuration e.g. on resume or when something
854 * else might have trampled over the hw state (like some overzealous old BIOSen
857 * This helper doesn't provide a error return value since restoring the old
858 * config should never fail due to resource allocation issues since the driver
859 * has successfully set the restored configuration already. Hence this should
860 * boil down to the equivalent of a few dpms on calls, which also don't provide
863 * Drivers where simply restoring an old configuration again might fail (e.g.
864 * due to slight differences in allocating shared resources when the
865 * configuration is restored in a different order than when userspace set it up)
866 * need to use their own restore logic.
868 void drm_helper_resume_force_mode(struct drm_device
*dev
)
870 struct drm_crtc
*crtc
;
871 struct drm_encoder
*encoder
;
872 struct drm_crtc_helper_funcs
*crtc_funcs
;
876 drm_modeset_lock_all(dev
);
877 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
882 ret
= drm_crtc_helper_set_mode(crtc
, &crtc
->mode
,
883 crtc
->x
, crtc
->y
, crtc
->primary
->fb
);
885 /* Restoring the old config should never fail! */
887 DRM_ERROR("failed to set mode on crtc %p\n", crtc
);
889 /* Turn off outputs that were already powered off */
890 if (drm_helper_choose_crtc_dpms(crtc
)) {
891 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
893 if(encoder
->crtc
!= crtc
)
896 encoder_dpms
= drm_helper_choose_encoder_dpms(
899 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
902 crtc_funcs
= crtc
->helper_private
;
903 if (crtc_funcs
->dpms
)
904 (*crtc_funcs
->dpms
) (crtc
,
905 drm_helper_choose_crtc_dpms(crtc
));
909 /* disable the unused connectors while restoring the modesetting */
910 __drm_helper_disable_unused_functions(dev
);
911 drm_modeset_unlock_all(dev
);
913 EXPORT_SYMBOL(drm_helper_resume_force_mode
);
916 * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers
918 * @mode: DRM display mode which userspace requested
919 * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks
920 * @x: x offset of the CRTC scanout area on the underlying framebuffer
921 * @y: y offset of the CRTC scanout area on the underlying framebuffer
922 * @old_fb: previous framebuffer
924 * This function implements a callback useable as the ->mode_set callback
925 * required by the crtc helpers. Besides the atomic plane helper functions for
926 * the primary plane the driver must also provide the ->mode_set_nofb callback
927 * to set up the crtc.
929 * This is a transitional helper useful for converting drivers to the atomic
932 int drm_helper_crtc_mode_set(struct drm_crtc
*crtc
, struct drm_display_mode
*mode
,
933 struct drm_display_mode
*adjusted_mode
, int x
, int y
,
934 struct drm_framebuffer
*old_fb
)
936 struct drm_crtc_state
*crtc_state
;
937 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
940 if (crtc
->funcs
->atomic_duplicate_state
)
941 crtc_state
= crtc
->funcs
->atomic_duplicate_state(crtc
);
942 else if (crtc
->state
)
943 crtc_state
= kmemdup(crtc
->state
, sizeof(*crtc_state
),
946 crtc_state
= kzalloc(sizeof(*crtc_state
), GFP_KERNEL
);
949 crtc_state
->crtc
= crtc
;
951 crtc_state
->enable
= true;
952 crtc_state
->planes_changed
= true;
953 crtc_state
->mode_changed
= true;
954 drm_mode_copy(&crtc_state
->mode
, mode
);
955 drm_mode_copy(&crtc_state
->adjusted_mode
, adjusted_mode
);
957 if (crtc_funcs
->atomic_check
) {
958 ret
= crtc_funcs
->atomic_check(crtc
, crtc_state
);
966 swap(crtc
->state
, crtc_state
);
968 crtc_funcs
->mode_set_nofb(crtc
);
971 if (crtc
->funcs
->atomic_destroy_state
)
972 crtc
->funcs
->atomic_destroy_state(crtc
, crtc_state
);
977 return drm_helper_crtc_mode_set_base(crtc
, x
, y
, old_fb
);
979 EXPORT_SYMBOL(drm_helper_crtc_mode_set
);
982 * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers
984 * @x: x offset of the CRTC scanout area on the underlying framebuffer
985 * @y: y offset of the CRTC scanout area on the underlying framebuffer
986 * @old_fb: previous framebuffer
988 * This function implements a callback useable as the ->mode_set_base used
989 * required by the crtc helpers. The driver must provide the atomic plane helper
990 * functions for the primary plane.
992 * This is a transitional helper useful for converting drivers to the atomic
995 int drm_helper_crtc_mode_set_base(struct drm_crtc
*crtc
, int x
, int y
,
996 struct drm_framebuffer
*old_fb
)
998 struct drm_plane_state
*plane_state
;
999 struct drm_plane
*plane
= crtc
->primary
;
1001 if (plane
->funcs
->atomic_duplicate_state
)
1002 plane_state
= plane
->funcs
->atomic_duplicate_state(plane
);
1003 else if (plane
->state
)
1004 plane_state
= drm_atomic_helper_plane_duplicate_state(plane
);
1006 plane_state
= kzalloc(sizeof(*plane_state
), GFP_KERNEL
);
1009 plane_state
->plane
= plane
;
1011 plane_state
->crtc
= crtc
;
1012 drm_atomic_set_fb_for_plane(plane_state
, crtc
->primary
->fb
);
1013 plane_state
->crtc_x
= 0;
1014 plane_state
->crtc_y
= 0;
1015 plane_state
->crtc_h
= crtc
->mode
.vdisplay
;
1016 plane_state
->crtc_w
= crtc
->mode
.hdisplay
;
1017 plane_state
->src_x
= x
<< 16;
1018 plane_state
->src_y
= y
<< 16;
1019 plane_state
->src_h
= crtc
->mode
.vdisplay
<< 16;
1020 plane_state
->src_w
= crtc
->mode
.hdisplay
<< 16;
1022 return drm_plane_helper_commit(plane
, plane_state
, old_fb
);
1024 EXPORT_SYMBOL(drm_helper_crtc_mode_set_base
);