2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
5 * DRM core CRTC related functions
7 * Permission to use, copy, modify, distribute, and sell this software and its
8 * documentation for any purpose is hereby granted without fee, provided that
9 * the above copyright notice appear in all copies and that both that copyright
10 * notice and this permission notice appear in supporting documentation, and
11 * that the name of the copyright holders not be used in advertising or
12 * publicity pertaining to distribution of the software without specific,
13 * written prior permission. The copyright holders make no representations
14 * about the suitability of this software for any purpose. It is provided "as
15 * is" without express or implied warranty.
17 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
19 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
21 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
22 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
32 #include <linux/export.h>
33 #include <linux/moduleparam.h>
36 #include <drm/drm_crtc.h>
37 #include <drm/drm_fourcc.h>
38 #include <drm/drm_crtc_helper.h>
39 #include <drm/drm_fb_helper.h>
40 #include <drm/drm_edid.h>
42 MODULE_AUTHOR("David Airlie, Jesse Barnes");
43 MODULE_DESCRIPTION("DRM KMS helper");
44 MODULE_LICENSE("GPL and additional rights");
47 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
49 * @dev: drm device to operate on
51 * Some userspace presumes that the first connected connector is the main
52 * display, where it's supposed to display e.g. the login screen. For
53 * laptops, this should be the main panel. Use this function to sort all
54 * (eDP/LVDS) panels to the front of the connector list, instead of
55 * painstakingly trying to initialize them in the right order.
57 void drm_helper_move_panel_connectors_to_head(struct drm_device
*dev
)
59 struct drm_connector
*connector
, *tmp
;
60 struct list_head panel_list
;
62 INIT_LIST_HEAD(&panel_list
);
64 list_for_each_entry_safe(connector
, tmp
,
65 &dev
->mode_config
.connector_list
, head
) {
66 if (connector
->connector_type
== DRM_MODE_CONNECTOR_LVDS
||
67 connector
->connector_type
== DRM_MODE_CONNECTOR_eDP
)
68 list_move_tail(&connector
->head
, &panel_list
);
71 list_splice(&panel_list
, &dev
->mode_config
.connector_list
);
73 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head
);
75 static bool drm_kms_helper_poll
= true;
76 module_param_named(poll
, drm_kms_helper_poll
, bool, 0600);
78 static void drm_mode_validate_flag(struct drm_connector
*connector
,
81 struct drm_display_mode
*mode
;
83 if (flags
== (DRM_MODE_FLAG_DBLSCAN
| DRM_MODE_FLAG_INTERLACE
|
84 DRM_MODE_FLAG_3D_MASK
))
87 list_for_each_entry(mode
, &connector
->modes
, head
) {
88 if ((mode
->flags
& DRM_MODE_FLAG_INTERLACE
) &&
89 !(flags
& DRM_MODE_FLAG_INTERLACE
))
90 mode
->status
= MODE_NO_INTERLACE
;
91 if ((mode
->flags
& DRM_MODE_FLAG_DBLSCAN
) &&
92 !(flags
& DRM_MODE_FLAG_DBLSCAN
))
93 mode
->status
= MODE_NO_DBLESCAN
;
94 if ((mode
->flags
& DRM_MODE_FLAG_3D_MASK
) &&
95 !(flags
& DRM_MODE_FLAG_3D_MASK
))
96 mode
->status
= MODE_NO_STEREO
;
103 * drm_helper_probe_single_connector_modes - get complete set of display modes
104 * @connector: connector to probe
105 * @maxX: max width for modes
106 * @maxY: max height for modes
108 * Based on the helper callbacks implemented by @connector try to detect all
109 * valid modes. Modes will first be added to the connector's probed_modes list,
110 * then culled (based on validity and the @maxX, @maxY parameters) and put into
111 * the normal modes list.
113 * Intended to be use as a generic implementation of the ->fill_modes()
114 * @connector vfunc for drivers that use the crtc helpers for output mode
115 * filtering and detection.
118 * The number of modes found on @connector.
120 int drm_helper_probe_single_connector_modes(struct drm_connector
*connector
,
121 uint32_t maxX
, uint32_t maxY
)
123 struct drm_device
*dev
= connector
->dev
;
124 struct drm_display_mode
*mode
;
125 struct drm_connector_helper_funcs
*connector_funcs
=
126 connector
->helper_private
;
129 bool verbose_prune
= true;
131 WARN_ON(!mutex_is_locked(&dev
->mode_config
.mutex
));
133 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector
->base
.id
,
134 drm_get_connector_name(connector
));
135 /* set all modes to the unverified state */
136 list_for_each_entry(mode
, &connector
->modes
, head
)
137 mode
->status
= MODE_UNVERIFIED
;
139 if (connector
->force
) {
140 if (connector
->force
== DRM_FORCE_ON
)
141 connector
->status
= connector_status_connected
;
143 connector
->status
= connector_status_disconnected
;
144 if (connector
->funcs
->force
)
145 connector
->funcs
->force(connector
);
147 connector
->status
= connector
->funcs
->detect(connector
, true);
150 /* Re-enable polling in case the global poll config changed. */
151 if (drm_kms_helper_poll
!= dev
->mode_config
.poll_running
)
152 drm_kms_helper_poll_enable(dev
);
154 dev
->mode_config
.poll_running
= drm_kms_helper_poll
;
156 if (connector
->status
== connector_status_disconnected
) {
157 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
158 connector
->base
.id
, drm_get_connector_name(connector
));
159 drm_mode_connector_update_edid_property(connector
, NULL
);
160 verbose_prune
= false;
164 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
165 count
= drm_load_edid_firmware(connector
);
168 count
= (*connector_funcs
->get_modes
)(connector
);
170 if (count
== 0 && connector
->status
== connector_status_connected
)
171 count
= drm_add_modes_noedid(connector
, 1024, 768);
175 drm_mode_connector_list_update(connector
);
178 drm_mode_validate_size(dev
, &connector
->modes
, maxX
, maxY
);
180 if (connector
->interlace_allowed
)
181 mode_flags
|= DRM_MODE_FLAG_INTERLACE
;
182 if (connector
->doublescan_allowed
)
183 mode_flags
|= DRM_MODE_FLAG_DBLSCAN
;
184 if (connector
->stereo_allowed
)
185 mode_flags
|= DRM_MODE_FLAG_3D_MASK
;
186 drm_mode_validate_flag(connector
, mode_flags
);
188 list_for_each_entry(mode
, &connector
->modes
, head
) {
189 if (mode
->status
== MODE_OK
)
190 mode
->status
= connector_funcs
->mode_valid(connector
,
195 drm_mode_prune_invalid(dev
, &connector
->modes
, verbose_prune
);
197 if (list_empty(&connector
->modes
))
200 list_for_each_entry(mode
, &connector
->modes
, head
)
201 mode
->vrefresh
= drm_mode_vrefresh(mode
);
203 drm_mode_sort(&connector
->modes
);
205 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector
->base
.id
,
206 drm_get_connector_name(connector
));
207 list_for_each_entry(mode
, &connector
->modes
, head
) {
208 drm_mode_set_crtcinfo(mode
, CRTC_INTERLACE_HALVE_V
);
209 drm_mode_debug_printmodeline(mode
);
214 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes
);
217 * drm_helper_encoder_in_use - check if a given encoder is in use
218 * @encoder: encoder to check
220 * Checks whether @encoder is with the current mode setting output configuration
221 * in use by any connector. This doesn't mean that it is actually enabled since
222 * the DPMS state is tracked separately.
225 * True if @encoder is used, false otherwise.
227 bool drm_helper_encoder_in_use(struct drm_encoder
*encoder
)
229 struct drm_connector
*connector
;
230 struct drm_device
*dev
= encoder
->dev
;
232 WARN_ON(!mutex_is_locked(&dev
->mode_config
.mutex
));
233 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
234 if (connector
->encoder
== encoder
)
238 EXPORT_SYMBOL(drm_helper_encoder_in_use
);
241 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
242 * @crtc: CRTC to check
244 * Checks whether @crtc is with the current mode setting output configuration
245 * in use by any connector. This doesn't mean that it is actually enabled since
246 * the DPMS state is tracked separately.
249 * True if @crtc is used, false otherwise.
251 bool drm_helper_crtc_in_use(struct drm_crtc
*crtc
)
253 struct drm_encoder
*encoder
;
254 struct drm_device
*dev
= crtc
->dev
;
256 WARN_ON(!mutex_is_locked(&dev
->mode_config
.mutex
));
257 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
)
258 if (encoder
->crtc
== crtc
&& drm_helper_encoder_in_use(encoder
))
262 EXPORT_SYMBOL(drm_helper_crtc_in_use
);
265 drm_encoder_disable(struct drm_encoder
*encoder
)
267 struct drm_encoder_helper_funcs
*encoder_funcs
= encoder
->helper_private
;
270 encoder
->bridge
->funcs
->disable(encoder
->bridge
);
272 if (encoder_funcs
->disable
)
273 (*encoder_funcs
->disable
)(encoder
);
275 (*encoder_funcs
->dpms
)(encoder
, DRM_MODE_DPMS_OFF
);
278 encoder
->bridge
->funcs
->post_disable(encoder
->bridge
);
282 * drm_helper_disable_unused_functions - disable unused objects
285 * This function walks through the entire mode setting configuration of @dev. It
286 * will remove any crtc links of unused encoders and encoder links of
287 * disconnected connectors. Then it will disable all unused encoders and crtcs
288 * either by calling their disable callback if available or by calling their
289 * dpms callback with DRM_MODE_DPMS_OFF.
291 void drm_helper_disable_unused_functions(struct drm_device
*dev
)
293 struct drm_encoder
*encoder
;
294 struct drm_connector
*connector
;
295 struct drm_crtc
*crtc
;
297 drm_warn_on_modeset_not_all_locked(dev
);
299 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
300 if (!connector
->encoder
)
302 if (connector
->status
== connector_status_disconnected
)
303 connector
->encoder
= NULL
;
306 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
307 if (!drm_helper_encoder_in_use(encoder
)) {
308 drm_encoder_disable(encoder
);
309 /* disconnector encoder from any connector */
310 encoder
->crtc
= NULL
;
314 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
315 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
316 crtc
->enabled
= drm_helper_crtc_in_use(crtc
);
317 if (!crtc
->enabled
) {
318 if (crtc_funcs
->disable
)
319 (*crtc_funcs
->disable
)(crtc
);
321 (*crtc_funcs
->dpms
)(crtc
, DRM_MODE_DPMS_OFF
);
326 EXPORT_SYMBOL(drm_helper_disable_unused_functions
);
329 * Check the CRTC we're going to map each output to vs. its current
330 * CRTC. If they don't match, we have to disable the output and the CRTC
331 * since the driver will have to re-route things.
334 drm_crtc_prepare_encoders(struct drm_device
*dev
)
336 struct drm_encoder_helper_funcs
*encoder_funcs
;
337 struct drm_encoder
*encoder
;
339 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
340 encoder_funcs
= encoder
->helper_private
;
341 /* Disable unused encoders */
342 if (encoder
->crtc
== NULL
)
343 drm_encoder_disable(encoder
);
344 /* Disable encoders whose CRTC is about to change */
345 if (encoder_funcs
->get_crtc
&&
346 encoder
->crtc
!= (*encoder_funcs
->get_crtc
)(encoder
))
347 drm_encoder_disable(encoder
);
352 * drm_crtc_helper_set_mode - internal helper to set a mode
353 * @crtc: CRTC to program
355 * @x: horizontal offset into the surface
356 * @y: vertical offset into the surface
357 * @old_fb: old framebuffer, for cleanup
359 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
360 * to fixup or reject the mode prior to trying to set it. This is an internal
361 * helper that drivers could e.g. use to update properties that require the
362 * entire output pipe to be disabled and re-enabled in a new configuration. For
363 * example for changing whether audio is enabled on a hdmi link or for changing
364 * panel fitter or dither attributes. It is also called by the
365 * drm_crtc_helper_set_config() helper function to drive the mode setting
369 * True if the mode was set successfully, false otherwise.
371 bool drm_crtc_helper_set_mode(struct drm_crtc
*crtc
,
372 struct drm_display_mode
*mode
,
374 struct drm_framebuffer
*old_fb
)
376 struct drm_device
*dev
= crtc
->dev
;
377 struct drm_display_mode
*adjusted_mode
, saved_mode
;
378 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
379 struct drm_encoder_helper_funcs
*encoder_funcs
;
380 int saved_x
, saved_y
;
382 struct drm_encoder
*encoder
;
385 drm_warn_on_modeset_not_all_locked(dev
);
387 saved_enabled
= crtc
->enabled
;
388 crtc
->enabled
= drm_helper_crtc_in_use(crtc
);
392 adjusted_mode
= drm_mode_duplicate(dev
, mode
);
393 if (!adjusted_mode
) {
394 crtc
->enabled
= saved_enabled
;
398 saved_mode
= crtc
->mode
;
402 /* Update crtc values up front so the driver can rely on them for mode
409 /* Pass our mode to the connectors and the CRTC to give them a chance to
410 * adjust it according to limitations or connector properties, and also
411 * a chance to reject the mode entirely.
413 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
415 if (encoder
->crtc
!= crtc
)
418 if (encoder
->bridge
&& encoder
->bridge
->funcs
->mode_fixup
) {
419 ret
= encoder
->bridge
->funcs
->mode_fixup(
420 encoder
->bridge
, mode
, adjusted_mode
);
422 DRM_DEBUG_KMS("Bridge fixup failed\n");
427 encoder_funcs
= encoder
->helper_private
;
428 if (!(ret
= encoder_funcs
->mode_fixup(encoder
, mode
,
430 DRM_DEBUG_KMS("Encoder fixup failed\n");
435 if (!(ret
= crtc_funcs
->mode_fixup(crtc
, mode
, adjusted_mode
))) {
436 DRM_DEBUG_KMS("CRTC fixup failed\n");
439 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc
->base
.id
);
441 /* Prepare the encoders and CRTCs before setting the mode. */
442 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
444 if (encoder
->crtc
!= crtc
)
448 encoder
->bridge
->funcs
->disable(encoder
->bridge
);
450 encoder_funcs
= encoder
->helper_private
;
451 /* Disable the encoders as the first thing we do. */
452 encoder_funcs
->prepare(encoder
);
455 encoder
->bridge
->funcs
->post_disable(encoder
->bridge
);
458 drm_crtc_prepare_encoders(dev
);
460 crtc_funcs
->prepare(crtc
);
462 /* Set up the DPLL and any encoders state that needs to adjust or depend
465 ret
= !crtc_funcs
->mode_set(crtc
, mode
, adjusted_mode
, x
, y
, old_fb
);
469 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
471 if (encoder
->crtc
!= crtc
)
474 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
475 encoder
->base
.id
, drm_get_encoder_name(encoder
),
476 mode
->base
.id
, mode
->name
);
477 encoder_funcs
= encoder
->helper_private
;
478 encoder_funcs
->mode_set(encoder
, mode
, adjusted_mode
);
480 if (encoder
->bridge
&& encoder
->bridge
->funcs
->mode_set
)
481 encoder
->bridge
->funcs
->mode_set(encoder
->bridge
, mode
,
485 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
486 crtc_funcs
->commit(crtc
);
488 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
490 if (encoder
->crtc
!= crtc
)
494 encoder
->bridge
->funcs
->pre_enable(encoder
->bridge
);
496 encoder_funcs
= encoder
->helper_private
;
497 encoder_funcs
->commit(encoder
);
500 encoder
->bridge
->funcs
->enable(encoder
->bridge
);
503 /* Store real post-adjustment hardware mode. */
504 crtc
->hwmode
= *adjusted_mode
;
506 /* Calculate and store various constants which
507 * are later needed by vblank and swap-completion
508 * timestamping. They are derived from true hwmode.
510 drm_calc_timestamping_constants(crtc
, &crtc
->hwmode
);
512 /* FIXME: add subpixel order */
514 drm_mode_destroy(dev
, adjusted_mode
);
516 crtc
->enabled
= saved_enabled
;
517 crtc
->mode
= saved_mode
;
524 EXPORT_SYMBOL(drm_crtc_helper_set_mode
);
528 drm_crtc_helper_disable(struct drm_crtc
*crtc
)
530 struct drm_device
*dev
= crtc
->dev
;
531 struct drm_connector
*connector
;
532 struct drm_encoder
*encoder
;
534 /* Decouple all encoders and their attached connectors from this crtc */
535 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
536 if (encoder
->crtc
!= crtc
)
539 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
540 if (connector
->encoder
!= encoder
)
543 connector
->encoder
= NULL
;
546 * drm_helper_disable_unused_functions() ought to be
547 * doing this, but since we've decoupled the encoder
548 * from the connector above, the required connection
549 * between them is henceforth no longer available.
551 connector
->dpms
= DRM_MODE_DPMS_OFF
;
555 drm_helper_disable_unused_functions(dev
);
560 * drm_crtc_helper_set_config - set a new config from userspace
561 * @set: mode set configuration
563 * Setup a new configuration, provided by the upper layers (either an ioctl call
564 * from userspace or internally e.g. from the fbdev suppport code) in @set, and
565 * enable it. This is the main helper functions for drivers that implement
566 * kernel mode setting with the crtc helper functions and the assorted
567 * ->prepare(), ->modeset() and ->commit() helper callbacks.
570 * Returns 0 on success, negative errno numbers on failure.
572 int drm_crtc_helper_set_config(struct drm_mode_set
*set
)
574 struct drm_device
*dev
;
575 struct drm_crtc
*new_crtc
;
576 struct drm_encoder
*save_encoders
, *new_encoder
, *encoder
;
577 bool mode_changed
= false; /* if true do a full mode set */
578 bool fb_changed
= false; /* if true and !mode_changed just do a flip */
579 struct drm_connector
*save_connectors
, *connector
;
580 int count
= 0, ro
, fail
= 0;
581 struct drm_crtc_helper_funcs
*crtc_funcs
;
582 struct drm_mode_set save_set
;
590 BUG_ON(!set
->crtc
->helper_private
);
592 /* Enforce sane interface api - has been abused by the fb helper. */
593 BUG_ON(!set
->mode
&& set
->fb
);
594 BUG_ON(set
->fb
&& set
->num_connectors
== 0);
596 crtc_funcs
= set
->crtc
->helper_private
;
602 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
603 set
->crtc
->base
.id
, set
->fb
->base
.id
,
604 (int)set
->num_connectors
, set
->x
, set
->y
);
606 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set
->crtc
->base
.id
);
607 return drm_crtc_helper_disable(set
->crtc
);
610 dev
= set
->crtc
->dev
;
612 drm_warn_on_modeset_not_all_locked(dev
);
615 * Allocate space for the backup of all (non-pointer) encoder and
618 save_encoders
= kzalloc(dev
->mode_config
.num_encoder
*
619 sizeof(struct drm_encoder
), GFP_KERNEL
);
623 save_connectors
= kzalloc(dev
->mode_config
.num_connector
*
624 sizeof(struct drm_connector
), GFP_KERNEL
);
625 if (!save_connectors
) {
626 kfree(save_encoders
);
631 * Copy data. Note that driver private data is not affected.
632 * Should anything bad happen only the expected state is
633 * restored, not the drivers personal bookkeeping.
636 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
637 save_encoders
[count
++] = *encoder
;
641 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
642 save_connectors
[count
++] = *connector
;
645 save_set
.crtc
= set
->crtc
;
646 save_set
.mode
= &set
->crtc
->mode
;
647 save_set
.x
= set
->crtc
->x
;
648 save_set
.y
= set
->crtc
->y
;
649 save_set
.fb
= set
->crtc
->fb
;
651 /* We should be able to check here if the fb has the same properties
652 * and then just flip_or_move it */
653 if (set
->crtc
->fb
!= set
->fb
) {
654 /* If we have no fb then treat it as a full mode set */
655 if (set
->crtc
->fb
== NULL
) {
656 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
658 } else if (set
->fb
== NULL
) {
660 } else if (set
->fb
->pixel_format
!=
661 set
->crtc
->fb
->pixel_format
) {
667 if (set
->x
!= set
->crtc
->x
|| set
->y
!= set
->crtc
->y
)
670 if (set
->mode
&& !drm_mode_equal(set
->mode
, &set
->crtc
->mode
)) {
671 DRM_DEBUG_KMS("modes are different, full mode set\n");
672 drm_mode_debug_printmodeline(&set
->crtc
->mode
);
673 drm_mode_debug_printmodeline(set
->mode
);
677 /* a) traverse passed in connector list and get encoders for them */
679 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
680 struct drm_connector_helper_funcs
*connector_funcs
=
681 connector
->helper_private
;
682 new_encoder
= connector
->encoder
;
683 for (ro
= 0; ro
< set
->num_connectors
; ro
++) {
684 if (set
->connectors
[ro
] == connector
) {
685 new_encoder
= connector_funcs
->best_encoder(connector
);
686 /* if we can't get an encoder for a connector
687 we are setting now - then fail */
688 if (new_encoder
== NULL
)
689 /* don't break so fail path works correct */
693 if (connector
->dpms
!= DRM_MODE_DPMS_ON
) {
694 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
700 if (new_encoder
!= connector
->encoder
) {
701 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
703 /* If the encoder is reused for another connector, then
704 * the appropriate crtc will be set later.
706 if (connector
->encoder
)
707 connector
->encoder
->crtc
= NULL
;
708 connector
->encoder
= new_encoder
;
718 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
719 if (!connector
->encoder
)
722 if (connector
->encoder
->crtc
== set
->crtc
)
725 new_crtc
= connector
->encoder
->crtc
;
727 for (ro
= 0; ro
< set
->num_connectors
; ro
++) {
728 if (set
->connectors
[ro
] == connector
)
729 new_crtc
= set
->crtc
;
732 /* Make sure the new CRTC will work with the encoder */
734 !drm_encoder_crtc_ok(connector
->encoder
, new_crtc
)) {
738 if (new_crtc
!= connector
->encoder
->crtc
) {
739 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
741 connector
->encoder
->crtc
= new_crtc
;
744 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
745 connector
->base
.id
, drm_get_connector_name(connector
),
748 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
749 connector
->base
.id
, drm_get_connector_name(connector
));
753 /* mode_set_base is not a required function */
754 if (fb_changed
&& !crtc_funcs
->mode_set_base
)
758 if (drm_helper_crtc_in_use(set
->crtc
)) {
759 DRM_DEBUG_KMS("attempting to set mode from"
761 drm_mode_debug_printmodeline(set
->mode
);
762 set
->crtc
->fb
= set
->fb
;
763 if (!drm_crtc_helper_set_mode(set
->crtc
, set
->mode
,
766 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
768 set
->crtc
->fb
= save_set
.fb
;
772 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
773 for (i
= 0; i
< set
->num_connectors
; i
++) {
774 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set
->connectors
[i
]->base
.id
,
775 drm_get_connector_name(set
->connectors
[i
]));
776 set
->connectors
[i
]->funcs
->dpms(set
->connectors
[i
], DRM_MODE_DPMS_ON
);
779 drm_helper_disable_unused_functions(dev
);
780 } else if (fb_changed
) {
781 set
->crtc
->x
= set
->x
;
782 set
->crtc
->y
= set
->y
;
783 set
->crtc
->fb
= set
->fb
;
784 ret
= crtc_funcs
->mode_set_base(set
->crtc
,
785 set
->x
, set
->y
, save_set
.fb
);
787 set
->crtc
->x
= save_set
.x
;
788 set
->crtc
->y
= save_set
.y
;
789 set
->crtc
->fb
= save_set
.fb
;
794 kfree(save_connectors
);
795 kfree(save_encoders
);
799 /* Restore all previous data. */
801 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
802 *encoder
= save_encoders
[count
++];
806 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
807 *connector
= save_connectors
[count
++];
810 /* Try to restore the config */
812 !drm_crtc_helper_set_mode(save_set
.crtc
, save_set
.mode
, save_set
.x
,
813 save_set
.y
, save_set
.fb
))
814 DRM_ERROR("failed to restore config after modeset failure\n");
816 kfree(save_connectors
);
817 kfree(save_encoders
);
820 EXPORT_SYMBOL(drm_crtc_helper_set_config
);
822 static int drm_helper_choose_encoder_dpms(struct drm_encoder
*encoder
)
824 int dpms
= DRM_MODE_DPMS_OFF
;
825 struct drm_connector
*connector
;
826 struct drm_device
*dev
= encoder
->dev
;
828 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
829 if (connector
->encoder
== encoder
)
830 if (connector
->dpms
< dpms
)
831 dpms
= connector
->dpms
;
835 /* Helper which handles bridge ordering around encoder dpms */
836 static void drm_helper_encoder_dpms(struct drm_encoder
*encoder
, int mode
)
838 struct drm_bridge
*bridge
= encoder
->bridge
;
839 struct drm_encoder_helper_funcs
*encoder_funcs
;
842 if (mode
== DRM_MODE_DPMS_ON
)
843 bridge
->funcs
->pre_enable(bridge
);
845 bridge
->funcs
->disable(bridge
);
848 encoder_funcs
= encoder
->helper_private
;
849 if (encoder_funcs
->dpms
)
850 encoder_funcs
->dpms(encoder
, mode
);
853 if (mode
== DRM_MODE_DPMS_ON
)
854 bridge
->funcs
->enable(bridge
);
856 bridge
->funcs
->post_disable(bridge
);
860 static int drm_helper_choose_crtc_dpms(struct drm_crtc
*crtc
)
862 int dpms
= DRM_MODE_DPMS_OFF
;
863 struct drm_connector
*connector
;
864 struct drm_device
*dev
= crtc
->dev
;
866 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
867 if (connector
->encoder
&& connector
->encoder
->crtc
== crtc
)
868 if (connector
->dpms
< dpms
)
869 dpms
= connector
->dpms
;
874 * drm_helper_connector_dpms() - connector dpms helper implementation
875 * @connector: affected connector
878 * This is the main helper function provided by the crtc helper framework for
879 * implementing the DPMS connector attribute. It computes the new desired DPMS
880 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
881 * callback provided by the driver appropriately.
883 void drm_helper_connector_dpms(struct drm_connector
*connector
, int mode
)
885 struct drm_encoder
*encoder
= connector
->encoder
;
886 struct drm_crtc
*crtc
= encoder
? encoder
->crtc
: NULL
;
887 int old_dpms
, encoder_dpms
= DRM_MODE_DPMS_OFF
;
889 if (mode
== connector
->dpms
)
892 old_dpms
= connector
->dpms
;
893 connector
->dpms
= mode
;
896 encoder_dpms
= drm_helper_choose_encoder_dpms(encoder
);
898 /* from off to on, do crtc then encoder */
899 if (mode
< old_dpms
) {
901 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
902 if (crtc_funcs
->dpms
)
903 (*crtc_funcs
->dpms
) (crtc
,
904 drm_helper_choose_crtc_dpms(crtc
));
907 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
910 /* from on to off, do encoder then crtc */
911 if (mode
> old_dpms
) {
913 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
915 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
916 if (crtc_funcs
->dpms
)
917 (*crtc_funcs
->dpms
) (crtc
,
918 drm_helper_choose_crtc_dpms(crtc
));
924 EXPORT_SYMBOL(drm_helper_connector_dpms
);
927 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
928 * @fb: drm_framebuffer object to fill out
929 * @mode_cmd: metadata from the userspace fb creation request
931 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
934 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer
*fb
,
935 struct drm_mode_fb_cmd2
*mode_cmd
)
939 fb
->width
= mode_cmd
->width
;
940 fb
->height
= mode_cmd
->height
;
941 for (i
= 0; i
< 4; i
++) {
942 fb
->pitches
[i
] = mode_cmd
->pitches
[i
];
943 fb
->offsets
[i
] = mode_cmd
->offsets
[i
];
945 drm_fb_get_bpp_depth(mode_cmd
->pixel_format
, &fb
->depth
,
946 &fb
->bits_per_pixel
);
947 fb
->pixel_format
= mode_cmd
->pixel_format
;
949 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct
);
952 * drm_helper_resume_force_mode - force-restore mode setting configuration
953 * @dev: drm_device which should be restored
955 * Drivers which use the mode setting helpers can use this function to
956 * force-restore the mode setting configuration e.g. on resume or when something
957 * else might have trampled over the hw state (like some overzealous old BIOSen
960 * This helper doesn't provide a error return value since restoring the old
961 * config should never fail due to resource allocation issues since the driver
962 * has successfully set the restored configuration already. Hence this should
963 * boil down to the equivalent of a few dpms on calls, which also don't provide
966 * Drivers where simply restoring an old configuration again might fail (e.g.
967 * due to slight differences in allocating shared resources when the
968 * configuration is restored in a different order than when userspace set it up)
969 * need to use their own restore logic.
971 void drm_helper_resume_force_mode(struct drm_device
*dev
)
973 struct drm_crtc
*crtc
;
974 struct drm_encoder
*encoder
;
975 struct drm_crtc_helper_funcs
*crtc_funcs
;
979 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
984 ret
= drm_crtc_helper_set_mode(crtc
, &crtc
->mode
,
985 crtc
->x
, crtc
->y
, crtc
->fb
);
987 /* Restoring the old config should never fail! */
989 DRM_ERROR("failed to set mode on crtc %p\n", crtc
);
991 /* Turn off outputs that were already powered off */
992 if (drm_helper_choose_crtc_dpms(crtc
)) {
993 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
995 if(encoder
->crtc
!= crtc
)
998 encoder_dpms
= drm_helper_choose_encoder_dpms(
1001 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
1004 crtc_funcs
= crtc
->helper_private
;
1005 if (crtc_funcs
->dpms
)
1006 (*crtc_funcs
->dpms
) (crtc
,
1007 drm_helper_choose_crtc_dpms(crtc
));
1011 /* disable the unused connectors while restoring the modesetting */
1012 drm_helper_disable_unused_functions(dev
);
1014 EXPORT_SYMBOL(drm_helper_resume_force_mode
);
1017 * drm_kms_helper_hotplug_event - fire off KMS hotplug events
1018 * @dev: drm_device whose connector state changed
1020 * This function fires off the uevent for userspace and also calls the
1021 * output_poll_changed function, which is most commonly used to inform the fbdev
1022 * emulation code and allow it to update the fbcon output configuration.
1024 * Drivers should call this from their hotplug handling code when a change is
1025 * detected. Note that this function does not do any output detection of its
1026 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
1029 * This function must be called from process context with no mode
1030 * setting locks held.
1032 void drm_kms_helper_hotplug_event(struct drm_device
*dev
)
1034 /* send a uevent + call fbdev */
1035 drm_sysfs_hotplug_event(dev
);
1036 if (dev
->mode_config
.funcs
->output_poll_changed
)
1037 dev
->mode_config
.funcs
->output_poll_changed(dev
);
1039 EXPORT_SYMBOL(drm_kms_helper_hotplug_event
);
1041 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1042 static void output_poll_execute(struct work_struct
*work
)
1044 struct delayed_work
*delayed_work
= to_delayed_work(work
);
1045 struct drm_device
*dev
= container_of(delayed_work
, struct drm_device
, mode_config
.output_poll_work
);
1046 struct drm_connector
*connector
;
1047 enum drm_connector_status old_status
;
1048 bool repoll
= false, changed
= false;
1050 if (!drm_kms_helper_poll
)
1053 mutex_lock(&dev
->mode_config
.mutex
);
1054 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
1056 /* Ignore forced connectors. */
1057 if (connector
->force
)
1060 /* Ignore HPD capable connectors and connectors where we don't
1061 * want any hotplug detection at all for polling. */
1062 if (!connector
->polled
|| connector
->polled
== DRM_CONNECTOR_POLL_HPD
)
1067 old_status
= connector
->status
;
1068 /* if we are connected and don't want to poll for disconnect
1070 if (old_status
== connector_status_connected
&&
1071 !(connector
->polled
& DRM_CONNECTOR_POLL_DISCONNECT
))
1074 connector
->status
= connector
->funcs
->detect(connector
, false);
1075 if (old_status
!= connector
->status
) {
1076 const char *old
, *new;
1078 old
= drm_get_connector_status_name(old_status
);
1079 new = drm_get_connector_status_name(connector
->status
);
1081 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1082 "status updated from %s to %s\n",
1084 drm_get_connector_name(connector
),
1091 mutex_unlock(&dev
->mode_config
.mutex
);
1094 drm_kms_helper_hotplug_event(dev
);
1097 schedule_delayed_work(delayed_work
, DRM_OUTPUT_POLL_PERIOD
);
1101 * drm_kms_helper_poll_disable - disable output polling
1104 * This function disables the output polling work.
1106 * Drivers can call this helper from their device suspend implementation. It is
1107 * not an error to call this even when output polling isn't enabled or arlready
1110 void drm_kms_helper_poll_disable(struct drm_device
*dev
)
1112 if (!dev
->mode_config
.poll_enabled
)
1114 cancel_delayed_work_sync(&dev
->mode_config
.output_poll_work
);
1116 EXPORT_SYMBOL(drm_kms_helper_poll_disable
);
1119 * drm_kms_helper_poll_enable - re-enable output polling.
1122 * This function re-enables the output polling work.
1124 * Drivers can call this helper from their device resume implementation. It is
1125 * an error to call this when the output polling support has not yet been set
1128 void drm_kms_helper_poll_enable(struct drm_device
*dev
)
1131 struct drm_connector
*connector
;
1133 if (!dev
->mode_config
.poll_enabled
|| !drm_kms_helper_poll
)
1136 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
1137 if (connector
->polled
& (DRM_CONNECTOR_POLL_CONNECT
|
1138 DRM_CONNECTOR_POLL_DISCONNECT
))
1143 schedule_delayed_work(&dev
->mode_config
.output_poll_work
, DRM_OUTPUT_POLL_PERIOD
);
1145 EXPORT_SYMBOL(drm_kms_helper_poll_enable
);
1148 * drm_kms_helper_poll_init - initialize and enable output polling
1151 * This function intializes and then also enables output polling support for
1152 * @dev. Drivers which do not have reliable hotplug support in hardware can use
1153 * this helper infrastructure to regularly poll such connectors for changes in
1154 * their connection state.
1156 * Drivers can control which connectors are polled by setting the
1157 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
1158 * connectors where probing live outputs can result in visual distortion drivers
1159 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
1160 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
1161 * completely ignored by the polling logic.
1163 * Note that a connector can be both polled and probed from the hotplug handler,
1164 * in case the hotplug interrupt is known to be unreliable.
1166 void drm_kms_helper_poll_init(struct drm_device
*dev
)
1168 INIT_DELAYED_WORK(&dev
->mode_config
.output_poll_work
, output_poll_execute
);
1169 dev
->mode_config
.poll_enabled
= true;
1171 drm_kms_helper_poll_enable(dev
);
1173 EXPORT_SYMBOL(drm_kms_helper_poll_init
);
1176 * drm_kms_helper_poll_fini - disable output polling and clean it up
1179 void drm_kms_helper_poll_fini(struct drm_device
*dev
)
1181 drm_kms_helper_poll_disable(dev
);
1183 EXPORT_SYMBOL(drm_kms_helper_poll_fini
);
1186 * drm_helper_hpd_irq_event - hotplug processing
1189 * Drivers can use this helper function to run a detect cycle on all connectors
1190 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
1191 * other connectors are ignored, which is useful to avoid reprobing fixed
1194 * This helper function is useful for drivers which can't or don't track hotplug
1195 * interrupts for each connector.
1197 * Drivers which support hotplug interrupts for each connector individually and
1198 * which have a more fine-grained detect logic should bypass this code and
1199 * directly call drm_kms_helper_hotplug_event() in case the connector state
1202 * This function must be called from process context with no mode
1203 * setting locks held.
1205 * Note that a connector can be both polled and probed from the hotplug handler,
1206 * in case the hotplug interrupt is known to be unreliable.
1208 bool drm_helper_hpd_irq_event(struct drm_device
*dev
)
1210 struct drm_connector
*connector
;
1211 enum drm_connector_status old_status
;
1212 bool changed
= false;
1214 if (!dev
->mode_config
.poll_enabled
)
1217 mutex_lock(&dev
->mode_config
.mutex
);
1218 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
1220 /* Only handle HPD capable connectors. */
1221 if (!(connector
->polled
& DRM_CONNECTOR_POLL_HPD
))
1224 old_status
= connector
->status
;
1226 connector
->status
= connector
->funcs
->detect(connector
, false);
1227 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1229 drm_get_connector_name(connector
),
1230 drm_get_connector_status_name(old_status
),
1231 drm_get_connector_status_name(connector
->status
));
1232 if (old_status
!= connector
->status
)
1236 mutex_unlock(&dev
->mode_config
.mutex
);
1239 drm_kms_helper_hotplug_event(dev
);
1243 EXPORT_SYMBOL(drm_helper_hpd_irq_event
);