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
);
281 static void __drm_helper_disable_unused_functions(struct drm_device
*dev
)
283 struct drm_encoder
*encoder
;
284 struct drm_connector
*connector
;
285 struct drm_crtc
*crtc
;
287 drm_warn_on_modeset_not_all_locked(dev
);
289 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
290 if (!connector
->encoder
)
294 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
295 if (!drm_helper_encoder_in_use(encoder
)) {
296 drm_encoder_disable(encoder
);
297 /* disconnector encoder from any connector */
298 encoder
->crtc
= NULL
;
302 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
303 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
304 crtc
->enabled
= drm_helper_crtc_in_use(crtc
);
305 if (!crtc
->enabled
) {
306 if (crtc_funcs
->disable
)
307 (*crtc_funcs
->disable
)(crtc
);
309 (*crtc_funcs
->dpms
)(crtc
, DRM_MODE_DPMS_OFF
);
310 crtc
->primary
->fb
= NULL
;
316 * drm_helper_disable_unused_functions - disable unused objects
319 * This function walks through the entire mode setting configuration of @dev. It
320 * will remove any crtc links of unused encoders and encoder links of
321 * disconnected connectors. Then it will disable all unused encoders and crtcs
322 * either by calling their disable callback if available or by calling their
323 * dpms callback with DRM_MODE_DPMS_OFF.
325 void drm_helper_disable_unused_functions(struct drm_device
*dev
)
327 drm_modeset_lock_all(dev
);
328 __drm_helper_disable_unused_functions(dev
);
329 drm_modeset_unlock_all(dev
);
331 EXPORT_SYMBOL(drm_helper_disable_unused_functions
);
334 * Check the CRTC we're going to map each output to vs. its current
335 * CRTC. If they don't match, we have to disable the output and the CRTC
336 * since the driver will have to re-route things.
339 drm_crtc_prepare_encoders(struct drm_device
*dev
)
341 struct drm_encoder_helper_funcs
*encoder_funcs
;
342 struct drm_encoder
*encoder
;
344 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
345 encoder_funcs
= encoder
->helper_private
;
346 /* Disable unused encoders */
347 if (encoder
->crtc
== NULL
)
348 drm_encoder_disable(encoder
);
349 /* Disable encoders whose CRTC is about to change */
350 if (encoder_funcs
->get_crtc
&&
351 encoder
->crtc
!= (*encoder_funcs
->get_crtc
)(encoder
))
352 drm_encoder_disable(encoder
);
357 * drm_crtc_helper_set_mode - internal helper to set a mode
358 * @crtc: CRTC to program
360 * @x: horizontal offset into the surface
361 * @y: vertical offset into the surface
362 * @old_fb: old framebuffer, for cleanup
364 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
365 * to fixup or reject the mode prior to trying to set it. This is an internal
366 * helper that drivers could e.g. use to update properties that require the
367 * entire output pipe to be disabled and re-enabled in a new configuration. For
368 * example for changing whether audio is enabled on a hdmi link or for changing
369 * panel fitter or dither attributes. It is also called by the
370 * drm_crtc_helper_set_config() helper function to drive the mode setting
374 * True if the mode was set successfully, false otherwise.
376 bool drm_crtc_helper_set_mode(struct drm_crtc
*crtc
,
377 struct drm_display_mode
*mode
,
379 struct drm_framebuffer
*old_fb
)
381 struct drm_device
*dev
= crtc
->dev
;
382 struct drm_display_mode
*adjusted_mode
, saved_mode
;
383 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
384 struct drm_encoder_helper_funcs
*encoder_funcs
;
385 int saved_x
, saved_y
;
387 struct drm_encoder
*encoder
;
390 drm_warn_on_modeset_not_all_locked(dev
);
392 saved_enabled
= crtc
->enabled
;
393 crtc
->enabled
= drm_helper_crtc_in_use(crtc
);
397 adjusted_mode
= drm_mode_duplicate(dev
, mode
);
398 if (!adjusted_mode
) {
399 crtc
->enabled
= saved_enabled
;
403 saved_mode
= crtc
->mode
;
407 /* Update crtc values up front so the driver can rely on them for mode
414 /* Pass our mode to the connectors and the CRTC to give them a chance to
415 * adjust it according to limitations or connector properties, and also
416 * a chance to reject the mode entirely.
418 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
420 if (encoder
->crtc
!= crtc
)
423 if (encoder
->bridge
&& encoder
->bridge
->funcs
->mode_fixup
) {
424 ret
= encoder
->bridge
->funcs
->mode_fixup(
425 encoder
->bridge
, mode
, adjusted_mode
);
427 DRM_DEBUG_KMS("Bridge fixup failed\n");
432 encoder_funcs
= encoder
->helper_private
;
433 if (!(ret
= encoder_funcs
->mode_fixup(encoder
, mode
,
435 DRM_DEBUG_KMS("Encoder fixup failed\n");
440 if (!(ret
= crtc_funcs
->mode_fixup(crtc
, mode
, adjusted_mode
))) {
441 DRM_DEBUG_KMS("CRTC fixup failed\n");
444 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc
->base
.id
);
446 /* Prepare the encoders and CRTCs before setting the mode. */
447 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
449 if (encoder
->crtc
!= crtc
)
453 encoder
->bridge
->funcs
->disable(encoder
->bridge
);
455 encoder_funcs
= encoder
->helper_private
;
456 /* Disable the encoders as the first thing we do. */
457 encoder_funcs
->prepare(encoder
);
460 encoder
->bridge
->funcs
->post_disable(encoder
->bridge
);
463 drm_crtc_prepare_encoders(dev
);
465 crtc_funcs
->prepare(crtc
);
467 /* Set up the DPLL and any encoders state that needs to adjust or depend
470 ret
= !crtc_funcs
->mode_set(crtc
, mode
, adjusted_mode
, x
, y
, old_fb
);
474 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
476 if (encoder
->crtc
!= crtc
)
479 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
480 encoder
->base
.id
, drm_get_encoder_name(encoder
),
481 mode
->base
.id
, mode
->name
);
482 encoder_funcs
= encoder
->helper_private
;
483 encoder_funcs
->mode_set(encoder
, mode
, adjusted_mode
);
485 if (encoder
->bridge
&& encoder
->bridge
->funcs
->mode_set
)
486 encoder
->bridge
->funcs
->mode_set(encoder
->bridge
, mode
,
490 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
491 crtc_funcs
->commit(crtc
);
493 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
495 if (encoder
->crtc
!= crtc
)
499 encoder
->bridge
->funcs
->pre_enable(encoder
->bridge
);
501 encoder_funcs
= encoder
->helper_private
;
502 encoder_funcs
->commit(encoder
);
505 encoder
->bridge
->funcs
->enable(encoder
->bridge
);
508 /* Store real post-adjustment hardware mode. */
509 crtc
->hwmode
= *adjusted_mode
;
511 /* Calculate and store various constants which
512 * are later needed by vblank and swap-completion
513 * timestamping. They are derived from true hwmode.
515 drm_calc_timestamping_constants(crtc
, &crtc
->hwmode
);
517 /* FIXME: add subpixel order */
519 drm_mode_destroy(dev
, adjusted_mode
);
521 crtc
->enabled
= saved_enabled
;
522 crtc
->mode
= saved_mode
;
529 EXPORT_SYMBOL(drm_crtc_helper_set_mode
);
533 drm_crtc_helper_disable(struct drm_crtc
*crtc
)
535 struct drm_device
*dev
= crtc
->dev
;
536 struct drm_connector
*connector
;
537 struct drm_encoder
*encoder
;
539 /* Decouple all encoders and their attached connectors from this crtc */
540 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
541 if (encoder
->crtc
!= crtc
)
544 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
545 if (connector
->encoder
!= encoder
)
548 connector
->encoder
= NULL
;
551 * drm_helper_disable_unused_functions() ought to be
552 * doing this, but since we've decoupled the encoder
553 * from the connector above, the required connection
554 * between them is henceforth no longer available.
556 connector
->dpms
= DRM_MODE_DPMS_OFF
;
560 __drm_helper_disable_unused_functions(dev
);
565 * drm_crtc_helper_set_config - set a new config from userspace
566 * @set: mode set configuration
568 * Setup a new configuration, provided by the upper layers (either an ioctl call
569 * from userspace or internally e.g. from the fbdev support code) in @set, and
570 * enable it. This is the main helper functions for drivers that implement
571 * kernel mode setting with the crtc helper functions and the assorted
572 * ->prepare(), ->modeset() and ->commit() helper callbacks.
575 * Returns 0 on success, negative errno numbers on failure.
577 int drm_crtc_helper_set_config(struct drm_mode_set
*set
)
579 struct drm_device
*dev
;
580 struct drm_crtc
*new_crtc
;
581 struct drm_encoder
*save_encoders
, *new_encoder
, *encoder
;
582 bool mode_changed
= false; /* if true do a full mode set */
583 bool fb_changed
= false; /* if true and !mode_changed just do a flip */
584 struct drm_connector
*save_connectors
, *connector
;
585 int count
= 0, ro
, fail
= 0;
586 struct drm_crtc_helper_funcs
*crtc_funcs
;
587 struct drm_mode_set save_set
;
595 BUG_ON(!set
->crtc
->helper_private
);
597 /* Enforce sane interface api - has been abused by the fb helper. */
598 BUG_ON(!set
->mode
&& set
->fb
);
599 BUG_ON(set
->fb
&& set
->num_connectors
== 0);
601 crtc_funcs
= set
->crtc
->helper_private
;
607 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
608 set
->crtc
->base
.id
, set
->fb
->base
.id
,
609 (int)set
->num_connectors
, set
->x
, set
->y
);
611 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set
->crtc
->base
.id
);
612 return drm_crtc_helper_disable(set
->crtc
);
615 dev
= set
->crtc
->dev
;
617 drm_warn_on_modeset_not_all_locked(dev
);
620 * Allocate space for the backup of all (non-pointer) encoder and
623 save_encoders
= kzalloc(dev
->mode_config
.num_encoder
*
624 sizeof(struct drm_encoder
), GFP_KERNEL
);
628 save_connectors
= kzalloc(dev
->mode_config
.num_connector
*
629 sizeof(struct drm_connector
), GFP_KERNEL
);
630 if (!save_connectors
) {
631 kfree(save_encoders
);
636 * Copy data. Note that driver private data is not affected.
637 * Should anything bad happen only the expected state is
638 * restored, not the drivers personal bookkeeping.
641 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
642 save_encoders
[count
++] = *encoder
;
646 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
647 save_connectors
[count
++] = *connector
;
650 save_set
.crtc
= set
->crtc
;
651 save_set
.mode
= &set
->crtc
->mode
;
652 save_set
.x
= set
->crtc
->x
;
653 save_set
.y
= set
->crtc
->y
;
654 save_set
.fb
= set
->crtc
->primary
->fb
;
656 /* We should be able to check here if the fb has the same properties
657 * and then just flip_or_move it */
658 if (set
->crtc
->primary
->fb
!= set
->fb
) {
659 /* If we have no fb then treat it as a full mode set */
660 if (set
->crtc
->primary
->fb
== NULL
) {
661 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
663 } else if (set
->fb
== NULL
) {
665 } else if (set
->fb
->pixel_format
!=
666 set
->crtc
->primary
->fb
->pixel_format
) {
672 if (set
->x
!= set
->crtc
->x
|| set
->y
!= set
->crtc
->y
)
675 if (set
->mode
&& !drm_mode_equal(set
->mode
, &set
->crtc
->mode
)) {
676 DRM_DEBUG_KMS("modes are different, full mode set\n");
677 drm_mode_debug_printmodeline(&set
->crtc
->mode
);
678 drm_mode_debug_printmodeline(set
->mode
);
682 /* a) traverse passed in connector list and get encoders for them */
684 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
685 struct drm_connector_helper_funcs
*connector_funcs
=
686 connector
->helper_private
;
687 new_encoder
= connector
->encoder
;
688 for (ro
= 0; ro
< set
->num_connectors
; ro
++) {
689 if (set
->connectors
[ro
] == connector
) {
690 new_encoder
= connector_funcs
->best_encoder(connector
);
691 /* if we can't get an encoder for a connector
692 we are setting now - then fail */
693 if (new_encoder
== NULL
)
694 /* don't break so fail path works correct */
697 if (connector
->dpms
!= DRM_MODE_DPMS_ON
) {
698 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
706 if (new_encoder
!= connector
->encoder
) {
707 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
709 /* If the encoder is reused for another connector, then
710 * the appropriate crtc will be set later.
712 if (connector
->encoder
)
713 connector
->encoder
->crtc
= NULL
;
714 connector
->encoder
= new_encoder
;
724 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
725 if (!connector
->encoder
)
728 if (connector
->encoder
->crtc
== set
->crtc
)
731 new_crtc
= connector
->encoder
->crtc
;
733 for (ro
= 0; ro
< set
->num_connectors
; ro
++) {
734 if (set
->connectors
[ro
] == connector
)
735 new_crtc
= set
->crtc
;
738 /* Make sure the new CRTC will work with the encoder */
740 !drm_encoder_crtc_ok(connector
->encoder
, new_crtc
)) {
744 if (new_crtc
!= connector
->encoder
->crtc
) {
745 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
747 connector
->encoder
->crtc
= new_crtc
;
750 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
751 connector
->base
.id
, drm_get_connector_name(connector
),
754 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
755 connector
->base
.id
, drm_get_connector_name(connector
));
759 /* mode_set_base is not a required function */
760 if (fb_changed
&& !crtc_funcs
->mode_set_base
)
764 if (drm_helper_crtc_in_use(set
->crtc
)) {
765 DRM_DEBUG_KMS("attempting to set mode from"
767 drm_mode_debug_printmodeline(set
->mode
);
768 set
->crtc
->primary
->fb
= set
->fb
;
769 if (!drm_crtc_helper_set_mode(set
->crtc
, set
->mode
,
772 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
774 set
->crtc
->primary
->fb
= save_set
.fb
;
778 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
779 for (i
= 0; i
< set
->num_connectors
; i
++) {
780 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set
->connectors
[i
]->base
.id
,
781 drm_get_connector_name(set
->connectors
[i
]));
782 set
->connectors
[i
]->funcs
->dpms(set
->connectors
[i
], DRM_MODE_DPMS_ON
);
785 __drm_helper_disable_unused_functions(dev
);
786 } else if (fb_changed
) {
787 set
->crtc
->x
= set
->x
;
788 set
->crtc
->y
= set
->y
;
789 set
->crtc
->primary
->fb
= set
->fb
;
790 ret
= crtc_funcs
->mode_set_base(set
->crtc
,
791 set
->x
, set
->y
, save_set
.fb
);
793 set
->crtc
->x
= save_set
.x
;
794 set
->crtc
->y
= save_set
.y
;
795 set
->crtc
->primary
->fb
= save_set
.fb
;
800 kfree(save_connectors
);
801 kfree(save_encoders
);
805 /* Restore all previous data. */
807 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
808 *encoder
= save_encoders
[count
++];
812 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
813 *connector
= save_connectors
[count
++];
816 /* Try to restore the config */
818 !drm_crtc_helper_set_mode(save_set
.crtc
, save_set
.mode
, save_set
.x
,
819 save_set
.y
, save_set
.fb
))
820 DRM_ERROR("failed to restore config after modeset failure\n");
822 kfree(save_connectors
);
823 kfree(save_encoders
);
826 EXPORT_SYMBOL(drm_crtc_helper_set_config
);
828 static int drm_helper_choose_encoder_dpms(struct drm_encoder
*encoder
)
830 int dpms
= DRM_MODE_DPMS_OFF
;
831 struct drm_connector
*connector
;
832 struct drm_device
*dev
= encoder
->dev
;
834 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
835 if (connector
->encoder
== encoder
)
836 if (connector
->dpms
< dpms
)
837 dpms
= connector
->dpms
;
841 /* Helper which handles bridge ordering around encoder dpms */
842 static void drm_helper_encoder_dpms(struct drm_encoder
*encoder
, int mode
)
844 struct drm_bridge
*bridge
= encoder
->bridge
;
845 struct drm_encoder_helper_funcs
*encoder_funcs
;
848 if (mode
== DRM_MODE_DPMS_ON
)
849 bridge
->funcs
->pre_enable(bridge
);
851 bridge
->funcs
->disable(bridge
);
854 encoder_funcs
= encoder
->helper_private
;
855 if (encoder_funcs
->dpms
)
856 encoder_funcs
->dpms(encoder
, mode
);
859 if (mode
== DRM_MODE_DPMS_ON
)
860 bridge
->funcs
->enable(bridge
);
862 bridge
->funcs
->post_disable(bridge
);
866 static int drm_helper_choose_crtc_dpms(struct drm_crtc
*crtc
)
868 int dpms
= DRM_MODE_DPMS_OFF
;
869 struct drm_connector
*connector
;
870 struct drm_device
*dev
= crtc
->dev
;
872 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
873 if (connector
->encoder
&& connector
->encoder
->crtc
== crtc
)
874 if (connector
->dpms
< dpms
)
875 dpms
= connector
->dpms
;
880 * drm_helper_connector_dpms() - connector dpms helper implementation
881 * @connector: affected connector
884 * This is the main helper function provided by the crtc helper framework for
885 * implementing the DPMS connector attribute. It computes the new desired DPMS
886 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
887 * callback provided by the driver appropriately.
889 void drm_helper_connector_dpms(struct drm_connector
*connector
, int mode
)
891 struct drm_encoder
*encoder
= connector
->encoder
;
892 struct drm_crtc
*crtc
= encoder
? encoder
->crtc
: NULL
;
893 int old_dpms
, encoder_dpms
= DRM_MODE_DPMS_OFF
;
895 if (mode
== connector
->dpms
)
898 old_dpms
= connector
->dpms
;
899 connector
->dpms
= mode
;
902 encoder_dpms
= drm_helper_choose_encoder_dpms(encoder
);
904 /* from off to on, do crtc then encoder */
905 if (mode
< old_dpms
) {
907 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
908 if (crtc_funcs
->dpms
)
909 (*crtc_funcs
->dpms
) (crtc
,
910 drm_helper_choose_crtc_dpms(crtc
));
913 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
916 /* from on to off, do encoder then crtc */
917 if (mode
> old_dpms
) {
919 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
921 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
922 if (crtc_funcs
->dpms
)
923 (*crtc_funcs
->dpms
) (crtc
,
924 drm_helper_choose_crtc_dpms(crtc
));
930 EXPORT_SYMBOL(drm_helper_connector_dpms
);
933 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
934 * @fb: drm_framebuffer object to fill out
935 * @mode_cmd: metadata from the userspace fb creation request
937 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
940 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer
*fb
,
941 struct drm_mode_fb_cmd2
*mode_cmd
)
945 fb
->width
= mode_cmd
->width
;
946 fb
->height
= mode_cmd
->height
;
947 for (i
= 0; i
< 4; i
++) {
948 fb
->pitches
[i
] = mode_cmd
->pitches
[i
];
949 fb
->offsets
[i
] = mode_cmd
->offsets
[i
];
951 drm_fb_get_bpp_depth(mode_cmd
->pixel_format
, &fb
->depth
,
952 &fb
->bits_per_pixel
);
953 fb
->pixel_format
= mode_cmd
->pixel_format
;
955 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct
);
958 * drm_helper_resume_force_mode - force-restore mode setting configuration
959 * @dev: drm_device which should be restored
961 * Drivers which use the mode setting helpers can use this function to
962 * force-restore the mode setting configuration e.g. on resume or when something
963 * else might have trampled over the hw state (like some overzealous old BIOSen
966 * This helper doesn't provide a error return value since restoring the old
967 * config should never fail due to resource allocation issues since the driver
968 * has successfully set the restored configuration already. Hence this should
969 * boil down to the equivalent of a few dpms on calls, which also don't provide
972 * Drivers where simply restoring an old configuration again might fail (e.g.
973 * due to slight differences in allocating shared resources when the
974 * configuration is restored in a different order than when userspace set it up)
975 * need to use their own restore logic.
977 void drm_helper_resume_force_mode(struct drm_device
*dev
)
979 struct drm_crtc
*crtc
;
980 struct drm_encoder
*encoder
;
981 struct drm_crtc_helper_funcs
*crtc_funcs
;
985 drm_modeset_lock_all(dev
);
986 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
991 ret
= drm_crtc_helper_set_mode(crtc
, &crtc
->mode
,
992 crtc
->x
, crtc
->y
, crtc
->primary
->fb
);
994 /* Restoring the old config should never fail! */
996 DRM_ERROR("failed to set mode on crtc %p\n", crtc
);
998 /* Turn off outputs that were already powered off */
999 if (drm_helper_choose_crtc_dpms(crtc
)) {
1000 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
1002 if(encoder
->crtc
!= crtc
)
1005 encoder_dpms
= drm_helper_choose_encoder_dpms(
1008 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
1011 crtc_funcs
= crtc
->helper_private
;
1012 if (crtc_funcs
->dpms
)
1013 (*crtc_funcs
->dpms
) (crtc
,
1014 drm_helper_choose_crtc_dpms(crtc
));
1018 /* disable the unused connectors while restoring the modesetting */
1019 __drm_helper_disable_unused_functions(dev
);
1020 drm_modeset_unlock_all(dev
);
1022 EXPORT_SYMBOL(drm_helper_resume_force_mode
);
1025 * drm_kms_helper_hotplug_event - fire off KMS hotplug events
1026 * @dev: drm_device whose connector state changed
1028 * This function fires off the uevent for userspace and also calls the
1029 * output_poll_changed function, which is most commonly used to inform the fbdev
1030 * emulation code and allow it to update the fbcon output configuration.
1032 * Drivers should call this from their hotplug handling code when a change is
1033 * detected. Note that this function does not do any output detection of its
1034 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
1037 * This function must be called from process context with no mode
1038 * setting locks held.
1040 void drm_kms_helper_hotplug_event(struct drm_device
*dev
)
1042 /* send a uevent + call fbdev */
1043 drm_sysfs_hotplug_event(dev
);
1044 if (dev
->mode_config
.funcs
->output_poll_changed
)
1045 dev
->mode_config
.funcs
->output_poll_changed(dev
);
1047 EXPORT_SYMBOL(drm_kms_helper_hotplug_event
);
1049 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1050 static void output_poll_execute(struct work_struct
*work
)
1052 struct delayed_work
*delayed_work
= to_delayed_work(work
);
1053 struct drm_device
*dev
= container_of(delayed_work
, struct drm_device
, mode_config
.output_poll_work
);
1054 struct drm_connector
*connector
;
1055 enum drm_connector_status old_status
;
1056 bool repoll
= false, changed
= false;
1058 if (!drm_kms_helper_poll
)
1061 mutex_lock(&dev
->mode_config
.mutex
);
1062 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
1064 /* Ignore forced connectors. */
1065 if (connector
->force
)
1068 /* Ignore HPD capable connectors and connectors where we don't
1069 * want any hotplug detection at all for polling. */
1070 if (!connector
->polled
|| connector
->polled
== DRM_CONNECTOR_POLL_HPD
)
1075 old_status
= connector
->status
;
1076 /* if we are connected and don't want to poll for disconnect
1078 if (old_status
== connector_status_connected
&&
1079 !(connector
->polled
& DRM_CONNECTOR_POLL_DISCONNECT
))
1082 connector
->status
= connector
->funcs
->detect(connector
, false);
1083 if (old_status
!= connector
->status
) {
1084 const char *old
, *new;
1086 old
= drm_get_connector_status_name(old_status
);
1087 new = drm_get_connector_status_name(connector
->status
);
1089 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1090 "status updated from %s to %s\n",
1092 drm_get_connector_name(connector
),
1099 mutex_unlock(&dev
->mode_config
.mutex
);
1102 drm_kms_helper_hotplug_event(dev
);
1105 schedule_delayed_work(delayed_work
, DRM_OUTPUT_POLL_PERIOD
);
1109 * drm_kms_helper_poll_disable - disable output polling
1112 * This function disables the output polling work.
1114 * Drivers can call this helper from their device suspend implementation. It is
1115 * not an error to call this even when output polling isn't enabled or arlready
1118 void drm_kms_helper_poll_disable(struct drm_device
*dev
)
1120 if (!dev
->mode_config
.poll_enabled
)
1122 cancel_delayed_work_sync(&dev
->mode_config
.output_poll_work
);
1124 EXPORT_SYMBOL(drm_kms_helper_poll_disable
);
1127 * drm_kms_helper_poll_enable - re-enable output polling.
1130 * This function re-enables the output polling work.
1132 * Drivers can call this helper from their device resume implementation. It is
1133 * an error to call this when the output polling support has not yet been set
1136 void drm_kms_helper_poll_enable(struct drm_device
*dev
)
1139 struct drm_connector
*connector
;
1141 if (!dev
->mode_config
.poll_enabled
|| !drm_kms_helper_poll
)
1144 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
1145 if (connector
->polled
& (DRM_CONNECTOR_POLL_CONNECT
|
1146 DRM_CONNECTOR_POLL_DISCONNECT
))
1151 schedule_delayed_work(&dev
->mode_config
.output_poll_work
, DRM_OUTPUT_POLL_PERIOD
);
1153 EXPORT_SYMBOL(drm_kms_helper_poll_enable
);
1156 * drm_kms_helper_poll_init - initialize and enable output polling
1159 * This function intializes and then also enables output polling support for
1160 * @dev. Drivers which do not have reliable hotplug support in hardware can use
1161 * this helper infrastructure to regularly poll such connectors for changes in
1162 * their connection state.
1164 * Drivers can control which connectors are polled by setting the
1165 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
1166 * connectors where probing live outputs can result in visual distortion drivers
1167 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
1168 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
1169 * completely ignored by the polling logic.
1171 * Note that a connector can be both polled and probed from the hotplug handler,
1172 * in case the hotplug interrupt is known to be unreliable.
1174 void drm_kms_helper_poll_init(struct drm_device
*dev
)
1176 INIT_DELAYED_WORK(&dev
->mode_config
.output_poll_work
, output_poll_execute
);
1177 dev
->mode_config
.poll_enabled
= true;
1179 drm_kms_helper_poll_enable(dev
);
1181 EXPORT_SYMBOL(drm_kms_helper_poll_init
);
1184 * drm_kms_helper_poll_fini - disable output polling and clean it up
1187 void drm_kms_helper_poll_fini(struct drm_device
*dev
)
1189 drm_kms_helper_poll_disable(dev
);
1191 EXPORT_SYMBOL(drm_kms_helper_poll_fini
);
1194 * drm_helper_hpd_irq_event - hotplug processing
1197 * Drivers can use this helper function to run a detect cycle on all connectors
1198 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
1199 * other connectors are ignored, which is useful to avoid reprobing fixed
1202 * This helper function is useful for drivers which can't or don't track hotplug
1203 * interrupts for each connector.
1205 * Drivers which support hotplug interrupts for each connector individually and
1206 * which have a more fine-grained detect logic should bypass this code and
1207 * directly call drm_kms_helper_hotplug_event() in case the connector state
1210 * This function must be called from process context with no mode
1211 * setting locks held.
1213 * Note that a connector can be both polled and probed from the hotplug handler,
1214 * in case the hotplug interrupt is known to be unreliable.
1216 bool drm_helper_hpd_irq_event(struct drm_device
*dev
)
1218 struct drm_connector
*connector
;
1219 enum drm_connector_status old_status
;
1220 bool changed
= false;
1222 if (!dev
->mode_config
.poll_enabled
)
1225 mutex_lock(&dev
->mode_config
.mutex
);
1226 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
1228 /* Only handle HPD capable connectors. */
1229 if (!(connector
->polled
& DRM_CONNECTOR_POLL_HPD
))
1232 old_status
= connector
->status
;
1234 connector
->status
= connector
->funcs
->detect(connector
, false);
1235 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1237 drm_get_connector_name(connector
),
1238 drm_get_connector_status_name(old_status
),
1239 drm_get_connector_status_name(connector
->status
));
1240 if (old_status
!= connector
->status
)
1244 mutex_unlock(&dev
->mode_config
.mutex
);
1247 drm_kms_helper_hotplug_event(dev
);
1251 EXPORT_SYMBOL(drm_helper_hpd_irq_event
);