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
)
292 if (connector
->status
== connector_status_disconnected
)
293 connector
->encoder
= NULL
;
296 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
297 if (!drm_helper_encoder_in_use(encoder
)) {
298 drm_encoder_disable(encoder
);
299 /* disconnector encoder from any connector */
300 encoder
->crtc
= NULL
;
304 list_for_each_entry(crtc
, &dev
->mode_config
.crtc_list
, head
) {
305 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
306 crtc
->enabled
= drm_helper_crtc_in_use(crtc
);
307 if (!crtc
->enabled
) {
308 if (crtc_funcs
->disable
)
309 (*crtc_funcs
->disable
)(crtc
);
311 (*crtc_funcs
->dpms
)(crtc
, DRM_MODE_DPMS_OFF
);
318 * drm_helper_disable_unused_functions - disable unused objects
321 * This function walks through the entire mode setting configuration of @dev. It
322 * will remove any crtc links of unused encoders and encoder links of
323 * disconnected connectors. Then it will disable all unused encoders and crtcs
324 * either by calling their disable callback if available or by calling their
325 * dpms callback with DRM_MODE_DPMS_OFF.
327 void drm_helper_disable_unused_functions(struct drm_device
*dev
)
329 drm_modeset_lock_all(dev
);
330 __drm_helper_disable_unused_functions(dev
);
331 drm_modeset_unlock_all(dev
);
333 EXPORT_SYMBOL(drm_helper_disable_unused_functions
);
336 * Check the CRTC we're going to map each output to vs. its current
337 * CRTC. If they don't match, we have to disable the output and the CRTC
338 * since the driver will have to re-route things.
341 drm_crtc_prepare_encoders(struct drm_device
*dev
)
343 struct drm_encoder_helper_funcs
*encoder_funcs
;
344 struct drm_encoder
*encoder
;
346 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
347 encoder_funcs
= encoder
->helper_private
;
348 /* Disable unused encoders */
349 if (encoder
->crtc
== NULL
)
350 drm_encoder_disable(encoder
);
351 /* Disable encoders whose CRTC is about to change */
352 if (encoder_funcs
->get_crtc
&&
353 encoder
->crtc
!= (*encoder_funcs
->get_crtc
)(encoder
))
354 drm_encoder_disable(encoder
);
359 * drm_crtc_helper_set_mode - internal helper to set a mode
360 * @crtc: CRTC to program
362 * @x: horizontal offset into the surface
363 * @y: vertical offset into the surface
364 * @old_fb: old framebuffer, for cleanup
366 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
367 * to fixup or reject the mode prior to trying to set it. This is an internal
368 * helper that drivers could e.g. use to update properties that require the
369 * entire output pipe to be disabled and re-enabled in a new configuration. For
370 * example for changing whether audio is enabled on a hdmi link or for changing
371 * panel fitter or dither attributes. It is also called by the
372 * drm_crtc_helper_set_config() helper function to drive the mode setting
376 * True if the mode was set successfully, false otherwise.
378 bool drm_crtc_helper_set_mode(struct drm_crtc
*crtc
,
379 struct drm_display_mode
*mode
,
381 struct drm_framebuffer
*old_fb
)
383 struct drm_device
*dev
= crtc
->dev
;
384 struct drm_display_mode
*adjusted_mode
, saved_mode
;
385 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
386 struct drm_encoder_helper_funcs
*encoder_funcs
;
387 int saved_x
, saved_y
;
389 struct drm_encoder
*encoder
;
392 drm_warn_on_modeset_not_all_locked(dev
);
394 saved_enabled
= crtc
->enabled
;
395 crtc
->enabled
= drm_helper_crtc_in_use(crtc
);
399 adjusted_mode
= drm_mode_duplicate(dev
, mode
);
400 if (!adjusted_mode
) {
401 crtc
->enabled
= saved_enabled
;
405 saved_mode
= crtc
->mode
;
409 /* Update crtc values up front so the driver can rely on them for mode
416 /* Pass our mode to the connectors and the CRTC to give them a chance to
417 * adjust it according to limitations or connector properties, and also
418 * a chance to reject the mode entirely.
420 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
422 if (encoder
->crtc
!= crtc
)
425 if (encoder
->bridge
&& encoder
->bridge
->funcs
->mode_fixup
) {
426 ret
= encoder
->bridge
->funcs
->mode_fixup(
427 encoder
->bridge
, mode
, adjusted_mode
);
429 DRM_DEBUG_KMS("Bridge fixup failed\n");
434 encoder_funcs
= encoder
->helper_private
;
435 if (!(ret
= encoder_funcs
->mode_fixup(encoder
, mode
,
437 DRM_DEBUG_KMS("Encoder fixup failed\n");
442 if (!(ret
= crtc_funcs
->mode_fixup(crtc
, mode
, adjusted_mode
))) {
443 DRM_DEBUG_KMS("CRTC fixup failed\n");
446 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc
->base
.id
);
448 /* Prepare the encoders and CRTCs before setting the mode. */
449 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
451 if (encoder
->crtc
!= crtc
)
455 encoder
->bridge
->funcs
->disable(encoder
->bridge
);
457 encoder_funcs
= encoder
->helper_private
;
458 /* Disable the encoders as the first thing we do. */
459 encoder_funcs
->prepare(encoder
);
462 encoder
->bridge
->funcs
->post_disable(encoder
->bridge
);
465 drm_crtc_prepare_encoders(dev
);
467 crtc_funcs
->prepare(crtc
);
469 /* Set up the DPLL and any encoders state that needs to adjust or depend
472 ret
= !crtc_funcs
->mode_set(crtc
, mode
, adjusted_mode
, x
, y
, old_fb
);
476 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
478 if (encoder
->crtc
!= crtc
)
481 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
482 encoder
->base
.id
, drm_get_encoder_name(encoder
),
483 mode
->base
.id
, mode
->name
);
484 encoder_funcs
= encoder
->helper_private
;
485 encoder_funcs
->mode_set(encoder
, mode
, adjusted_mode
);
487 if (encoder
->bridge
&& encoder
->bridge
->funcs
->mode_set
)
488 encoder
->bridge
->funcs
->mode_set(encoder
->bridge
, mode
,
492 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
493 crtc_funcs
->commit(crtc
);
495 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
497 if (encoder
->crtc
!= crtc
)
501 encoder
->bridge
->funcs
->pre_enable(encoder
->bridge
);
503 encoder_funcs
= encoder
->helper_private
;
504 encoder_funcs
->commit(encoder
);
507 encoder
->bridge
->funcs
->enable(encoder
->bridge
);
510 /* Store real post-adjustment hardware mode. */
511 crtc
->hwmode
= *adjusted_mode
;
513 /* Calculate and store various constants which
514 * are later needed by vblank and swap-completion
515 * timestamping. They are derived from true hwmode.
517 drm_calc_timestamping_constants(crtc
, &crtc
->hwmode
);
519 /* FIXME: add subpixel order */
521 drm_mode_destroy(dev
, adjusted_mode
);
523 crtc
->enabled
= saved_enabled
;
524 crtc
->mode
= saved_mode
;
531 EXPORT_SYMBOL(drm_crtc_helper_set_mode
);
535 drm_crtc_helper_disable(struct drm_crtc
*crtc
)
537 struct drm_device
*dev
= crtc
->dev
;
538 struct drm_connector
*connector
;
539 struct drm_encoder
*encoder
;
541 /* Decouple all encoders and their attached connectors from this crtc */
542 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
543 if (encoder
->crtc
!= crtc
)
546 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
547 if (connector
->encoder
!= encoder
)
550 connector
->encoder
= NULL
;
553 * drm_helper_disable_unused_functions() ought to be
554 * doing this, but since we've decoupled the encoder
555 * from the connector above, the required connection
556 * between them is henceforth no longer available.
558 connector
->dpms
= DRM_MODE_DPMS_OFF
;
562 __drm_helper_disable_unused_functions(dev
);
567 * drm_crtc_helper_set_config - set a new config from userspace
568 * @set: mode set configuration
570 * Setup a new configuration, provided by the upper layers (either an ioctl call
571 * from userspace or internally e.g. from the fbdev suppport code) in @set, and
572 * enable it. This is the main helper functions for drivers that implement
573 * kernel mode setting with the crtc helper functions and the assorted
574 * ->prepare(), ->modeset() and ->commit() helper callbacks.
577 * Returns 0 on success, negative errno numbers on failure.
579 int drm_crtc_helper_set_config(struct drm_mode_set
*set
)
581 struct drm_device
*dev
;
582 struct drm_crtc
*new_crtc
;
583 struct drm_encoder
*save_encoders
, *new_encoder
, *encoder
;
584 bool mode_changed
= false; /* if true do a full mode set */
585 bool fb_changed
= false; /* if true and !mode_changed just do a flip */
586 struct drm_connector
*save_connectors
, *connector
;
587 int count
= 0, ro
, fail
= 0;
588 struct drm_crtc_helper_funcs
*crtc_funcs
;
589 struct drm_mode_set save_set
;
597 BUG_ON(!set
->crtc
->helper_private
);
599 /* Enforce sane interface api - has been abused by the fb helper. */
600 BUG_ON(!set
->mode
&& set
->fb
);
601 BUG_ON(set
->fb
&& set
->num_connectors
== 0);
603 crtc_funcs
= set
->crtc
->helper_private
;
609 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
610 set
->crtc
->base
.id
, set
->fb
->base
.id
,
611 (int)set
->num_connectors
, set
->x
, set
->y
);
613 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set
->crtc
->base
.id
);
614 return drm_crtc_helper_disable(set
->crtc
);
617 dev
= set
->crtc
->dev
;
619 drm_warn_on_modeset_not_all_locked(dev
);
622 * Allocate space for the backup of all (non-pointer) encoder and
625 save_encoders
= kzalloc(dev
->mode_config
.num_encoder
*
626 sizeof(struct drm_encoder
), GFP_KERNEL
);
630 save_connectors
= kzalloc(dev
->mode_config
.num_connector
*
631 sizeof(struct drm_connector
), GFP_KERNEL
);
632 if (!save_connectors
) {
633 kfree(save_encoders
);
638 * Copy data. Note that driver private data is not affected.
639 * Should anything bad happen only the expected state is
640 * restored, not the drivers personal bookkeeping.
643 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
644 save_encoders
[count
++] = *encoder
;
648 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
649 save_connectors
[count
++] = *connector
;
652 save_set
.crtc
= set
->crtc
;
653 save_set
.mode
= &set
->crtc
->mode
;
654 save_set
.x
= set
->crtc
->x
;
655 save_set
.y
= set
->crtc
->y
;
656 save_set
.fb
= set
->crtc
->fb
;
658 /* We should be able to check here if the fb has the same properties
659 * and then just flip_or_move it */
660 if (set
->crtc
->fb
!= set
->fb
) {
661 /* If we have no fb then treat it as a full mode set */
662 if (set
->crtc
->fb
== NULL
) {
663 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
665 } else if (set
->fb
== NULL
) {
667 } else if (set
->fb
->pixel_format
!=
668 set
->crtc
->fb
->pixel_format
) {
674 if (set
->x
!= set
->crtc
->x
|| set
->y
!= set
->crtc
->y
)
677 if (set
->mode
&& !drm_mode_equal(set
->mode
, &set
->crtc
->mode
)) {
678 DRM_DEBUG_KMS("modes are different, full mode set\n");
679 drm_mode_debug_printmodeline(&set
->crtc
->mode
);
680 drm_mode_debug_printmodeline(set
->mode
);
684 /* a) traverse passed in connector list and get encoders for them */
686 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
687 struct drm_connector_helper_funcs
*connector_funcs
=
688 connector
->helper_private
;
689 new_encoder
= connector
->encoder
;
690 for (ro
= 0; ro
< set
->num_connectors
; ro
++) {
691 if (set
->connectors
[ro
] == connector
) {
692 new_encoder
= connector_funcs
->best_encoder(connector
);
693 /* if we can't get an encoder for a connector
694 we are setting now - then fail */
695 if (new_encoder
== NULL
)
696 /* don't break so fail path works correct */
700 if (connector
->dpms
!= DRM_MODE_DPMS_ON
) {
701 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
707 if (new_encoder
!= connector
->encoder
) {
708 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
710 /* If the encoder is reused for another connector, then
711 * the appropriate crtc will be set later.
713 if (connector
->encoder
)
714 connector
->encoder
->crtc
= NULL
;
715 connector
->encoder
= new_encoder
;
725 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
726 if (!connector
->encoder
)
729 if (connector
->encoder
->crtc
== set
->crtc
)
732 new_crtc
= connector
->encoder
->crtc
;
734 for (ro
= 0; ro
< set
->num_connectors
; ro
++) {
735 if (set
->connectors
[ro
] == connector
)
736 new_crtc
= set
->crtc
;
739 /* Make sure the new CRTC will work with the encoder */
741 !drm_encoder_crtc_ok(connector
->encoder
, new_crtc
)) {
745 if (new_crtc
!= connector
->encoder
->crtc
) {
746 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
748 connector
->encoder
->crtc
= new_crtc
;
751 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
752 connector
->base
.id
, drm_get_connector_name(connector
),
755 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
756 connector
->base
.id
, drm_get_connector_name(connector
));
760 /* mode_set_base is not a required function */
761 if (fb_changed
&& !crtc_funcs
->mode_set_base
)
765 if (drm_helper_crtc_in_use(set
->crtc
)) {
766 DRM_DEBUG_KMS("attempting to set mode from"
768 drm_mode_debug_printmodeline(set
->mode
);
769 set
->crtc
->fb
= set
->fb
;
770 if (!drm_crtc_helper_set_mode(set
->crtc
, set
->mode
,
773 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
775 set
->crtc
->fb
= save_set
.fb
;
779 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
780 for (i
= 0; i
< set
->num_connectors
; i
++) {
781 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set
->connectors
[i
]->base
.id
,
782 drm_get_connector_name(set
->connectors
[i
]));
783 set
->connectors
[i
]->funcs
->dpms(set
->connectors
[i
], DRM_MODE_DPMS_ON
);
786 __drm_helper_disable_unused_functions(dev
);
787 } else if (fb_changed
) {
788 set
->crtc
->x
= set
->x
;
789 set
->crtc
->y
= set
->y
;
790 set
->crtc
->fb
= set
->fb
;
791 ret
= crtc_funcs
->mode_set_base(set
->crtc
,
792 set
->x
, set
->y
, save_set
.fb
);
794 set
->crtc
->x
= save_set
.x
;
795 set
->crtc
->y
= save_set
.y
;
796 set
->crtc
->fb
= save_set
.fb
;
801 kfree(save_connectors
);
802 kfree(save_encoders
);
806 /* Restore all previous data. */
808 list_for_each_entry(encoder
, &dev
->mode_config
.encoder_list
, head
) {
809 *encoder
= save_encoders
[count
++];
813 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
814 *connector
= save_connectors
[count
++];
817 /* Try to restore the config */
819 !drm_crtc_helper_set_mode(save_set
.crtc
, save_set
.mode
, save_set
.x
,
820 save_set
.y
, save_set
.fb
))
821 DRM_ERROR("failed to restore config after modeset failure\n");
823 kfree(save_connectors
);
824 kfree(save_encoders
);
827 EXPORT_SYMBOL(drm_crtc_helper_set_config
);
829 static int drm_helper_choose_encoder_dpms(struct drm_encoder
*encoder
)
831 int dpms
= DRM_MODE_DPMS_OFF
;
832 struct drm_connector
*connector
;
833 struct drm_device
*dev
= encoder
->dev
;
835 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
836 if (connector
->encoder
== encoder
)
837 if (connector
->dpms
< dpms
)
838 dpms
= connector
->dpms
;
842 /* Helper which handles bridge ordering around encoder dpms */
843 static void drm_helper_encoder_dpms(struct drm_encoder
*encoder
, int mode
)
845 struct drm_bridge
*bridge
= encoder
->bridge
;
846 struct drm_encoder_helper_funcs
*encoder_funcs
;
849 if (mode
== DRM_MODE_DPMS_ON
)
850 bridge
->funcs
->pre_enable(bridge
);
852 bridge
->funcs
->disable(bridge
);
855 encoder_funcs
= encoder
->helper_private
;
856 if (encoder_funcs
->dpms
)
857 encoder_funcs
->dpms(encoder
, mode
);
860 if (mode
== DRM_MODE_DPMS_ON
)
861 bridge
->funcs
->enable(bridge
);
863 bridge
->funcs
->post_disable(bridge
);
867 static int drm_helper_choose_crtc_dpms(struct drm_crtc
*crtc
)
869 int dpms
= DRM_MODE_DPMS_OFF
;
870 struct drm_connector
*connector
;
871 struct drm_device
*dev
= crtc
->dev
;
873 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
)
874 if (connector
->encoder
&& connector
->encoder
->crtc
== crtc
)
875 if (connector
->dpms
< dpms
)
876 dpms
= connector
->dpms
;
881 * drm_helper_connector_dpms() - connector dpms helper implementation
882 * @connector: affected connector
885 * This is the main helper function provided by the crtc helper framework for
886 * implementing the DPMS connector attribute. It computes the new desired DPMS
887 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
888 * callback provided by the driver appropriately.
890 void drm_helper_connector_dpms(struct drm_connector
*connector
, int mode
)
892 struct drm_encoder
*encoder
= connector
->encoder
;
893 struct drm_crtc
*crtc
= encoder
? encoder
->crtc
: NULL
;
894 int old_dpms
, encoder_dpms
= DRM_MODE_DPMS_OFF
;
896 if (mode
== connector
->dpms
)
899 old_dpms
= connector
->dpms
;
900 connector
->dpms
= mode
;
903 encoder_dpms
= drm_helper_choose_encoder_dpms(encoder
);
905 /* from off to on, do crtc then encoder */
906 if (mode
< old_dpms
) {
908 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
909 if (crtc_funcs
->dpms
)
910 (*crtc_funcs
->dpms
) (crtc
,
911 drm_helper_choose_crtc_dpms(crtc
));
914 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
917 /* from on to off, do encoder then crtc */
918 if (mode
> old_dpms
) {
920 drm_helper_encoder_dpms(encoder
, encoder_dpms
);
922 struct drm_crtc_helper_funcs
*crtc_funcs
= crtc
->helper_private
;
923 if (crtc_funcs
->dpms
)
924 (*crtc_funcs
->dpms
) (crtc
,
925 drm_helper_choose_crtc_dpms(crtc
));
931 EXPORT_SYMBOL(drm_helper_connector_dpms
);
934 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
935 * @fb: drm_framebuffer object to fill out
936 * @mode_cmd: metadata from the userspace fb creation request
938 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
941 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer
*fb
,
942 struct drm_mode_fb_cmd2
*mode_cmd
)
946 fb
->width
= mode_cmd
->width
;
947 fb
->height
= mode_cmd
->height
;
948 for (i
= 0; i
< 4; i
++) {
949 fb
->pitches
[i
] = mode_cmd
->pitches
[i
];
950 fb
->offsets
[i
] = mode_cmd
->offsets
[i
];
952 drm_fb_get_bpp_depth(mode_cmd
->pixel_format
, &fb
->depth
,
953 &fb
->bits_per_pixel
);
954 fb
->pixel_format
= mode_cmd
->pixel_format
;
956 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct
);
959 * drm_helper_resume_force_mode - force-restore mode setting configuration
960 * @dev: drm_device which should be restored
962 * Drivers which use the mode setting helpers can use this function to
963 * force-restore the mode setting configuration e.g. on resume or when something
964 * else might have trampled over the hw state (like some overzealous old BIOSen
967 * This helper doesn't provide a error return value since restoring the old
968 * config should never fail due to resource allocation issues since the driver
969 * has successfully set the restored configuration already. Hence this should
970 * boil down to the equivalent of a few dpms on calls, which also don't provide
973 * Drivers where simply restoring an old configuration again might fail (e.g.
974 * due to slight differences in allocating shared resources when the
975 * configuration is restored in a different order than when userspace set it up)
976 * need to use their own restore logic.
978 void drm_helper_resume_force_mode(struct drm_device
*dev
)
980 struct drm_crtc
*crtc
;
981 struct drm_encoder
*encoder
;
982 struct drm_crtc_helper_funcs
*crtc_funcs
;
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
->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
);
1021 EXPORT_SYMBOL(drm_helper_resume_force_mode
);
1024 * drm_kms_helper_hotplug_event - fire off KMS hotplug events
1025 * @dev: drm_device whose connector state changed
1027 * This function fires off the uevent for userspace and also calls the
1028 * output_poll_changed function, which is most commonly used to inform the fbdev
1029 * emulation code and allow it to update the fbcon output configuration.
1031 * Drivers should call this from their hotplug handling code when a change is
1032 * detected. Note that this function does not do any output detection of its
1033 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
1036 * This function must be called from process context with no mode
1037 * setting locks held.
1039 void drm_kms_helper_hotplug_event(struct drm_device
*dev
)
1041 /* send a uevent + call fbdev */
1042 drm_sysfs_hotplug_event(dev
);
1043 if (dev
->mode_config
.funcs
->output_poll_changed
)
1044 dev
->mode_config
.funcs
->output_poll_changed(dev
);
1046 EXPORT_SYMBOL(drm_kms_helper_hotplug_event
);
1048 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1049 static void output_poll_execute(struct work_struct
*work
)
1051 struct delayed_work
*delayed_work
= to_delayed_work(work
);
1052 struct drm_device
*dev
= container_of(delayed_work
, struct drm_device
, mode_config
.output_poll_work
);
1053 struct drm_connector
*connector
;
1054 enum drm_connector_status old_status
;
1055 bool repoll
= false, changed
= false;
1057 if (!drm_kms_helper_poll
)
1060 mutex_lock(&dev
->mode_config
.mutex
);
1061 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
1063 /* Ignore forced connectors. */
1064 if (connector
->force
)
1067 /* Ignore HPD capable connectors and connectors where we don't
1068 * want any hotplug detection at all for polling. */
1069 if (!connector
->polled
|| connector
->polled
== DRM_CONNECTOR_POLL_HPD
)
1074 old_status
= connector
->status
;
1075 /* if we are connected and don't want to poll for disconnect
1077 if (old_status
== connector_status_connected
&&
1078 !(connector
->polled
& DRM_CONNECTOR_POLL_DISCONNECT
))
1081 connector
->status
= connector
->funcs
->detect(connector
, false);
1082 if (old_status
!= connector
->status
) {
1083 const char *old
, *new;
1085 old
= drm_get_connector_status_name(old_status
);
1086 new = drm_get_connector_status_name(connector
->status
);
1088 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1089 "status updated from %s to %s\n",
1091 drm_get_connector_name(connector
),
1098 mutex_unlock(&dev
->mode_config
.mutex
);
1101 drm_kms_helper_hotplug_event(dev
);
1104 schedule_delayed_work(delayed_work
, DRM_OUTPUT_POLL_PERIOD
);
1108 * drm_kms_helper_poll_disable - disable output polling
1111 * This function disables the output polling work.
1113 * Drivers can call this helper from their device suspend implementation. It is
1114 * not an error to call this even when output polling isn't enabled or arlready
1117 void drm_kms_helper_poll_disable(struct drm_device
*dev
)
1119 if (!dev
->mode_config
.poll_enabled
)
1121 cancel_delayed_work_sync(&dev
->mode_config
.output_poll_work
);
1123 EXPORT_SYMBOL(drm_kms_helper_poll_disable
);
1126 * drm_kms_helper_poll_enable - re-enable output polling.
1129 * This function re-enables the output polling work.
1131 * Drivers can call this helper from their device resume implementation. It is
1132 * an error to call this when the output polling support has not yet been set
1135 void drm_kms_helper_poll_enable(struct drm_device
*dev
)
1138 struct drm_connector
*connector
;
1140 if (!dev
->mode_config
.poll_enabled
|| !drm_kms_helper_poll
)
1143 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
1144 if (connector
->polled
& (DRM_CONNECTOR_POLL_CONNECT
|
1145 DRM_CONNECTOR_POLL_DISCONNECT
))
1150 schedule_delayed_work(&dev
->mode_config
.output_poll_work
, DRM_OUTPUT_POLL_PERIOD
);
1152 EXPORT_SYMBOL(drm_kms_helper_poll_enable
);
1155 * drm_kms_helper_poll_init - initialize and enable output polling
1158 * This function intializes and then also enables output polling support for
1159 * @dev. Drivers which do not have reliable hotplug support in hardware can use
1160 * this helper infrastructure to regularly poll such connectors for changes in
1161 * their connection state.
1163 * Drivers can control which connectors are polled by setting the
1164 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
1165 * connectors where probing live outputs can result in visual distortion drivers
1166 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
1167 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
1168 * completely ignored by the polling logic.
1170 * Note that a connector can be both polled and probed from the hotplug handler,
1171 * in case the hotplug interrupt is known to be unreliable.
1173 void drm_kms_helper_poll_init(struct drm_device
*dev
)
1175 INIT_DELAYED_WORK(&dev
->mode_config
.output_poll_work
, output_poll_execute
);
1176 dev
->mode_config
.poll_enabled
= true;
1178 drm_kms_helper_poll_enable(dev
);
1180 EXPORT_SYMBOL(drm_kms_helper_poll_init
);
1183 * drm_kms_helper_poll_fini - disable output polling and clean it up
1186 void drm_kms_helper_poll_fini(struct drm_device
*dev
)
1188 drm_kms_helper_poll_disable(dev
);
1190 EXPORT_SYMBOL(drm_kms_helper_poll_fini
);
1193 * drm_helper_hpd_irq_event - hotplug processing
1196 * Drivers can use this helper function to run a detect cycle on all connectors
1197 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
1198 * other connectors are ignored, which is useful to avoid reprobing fixed
1201 * This helper function is useful for drivers which can't or don't track hotplug
1202 * interrupts for each connector.
1204 * Drivers which support hotplug interrupts for each connector individually and
1205 * which have a more fine-grained detect logic should bypass this code and
1206 * directly call drm_kms_helper_hotplug_event() in case the connector state
1209 * This function must be called from process context with no mode
1210 * setting locks held.
1212 * Note that a connector can be both polled and probed from the hotplug handler,
1213 * in case the hotplug interrupt is known to be unreliable.
1215 bool drm_helper_hpd_irq_event(struct drm_device
*dev
)
1217 struct drm_connector
*connector
;
1218 enum drm_connector_status old_status
;
1219 bool changed
= false;
1221 if (!dev
->mode_config
.poll_enabled
)
1224 mutex_lock(&dev
->mode_config
.mutex
);
1225 list_for_each_entry(connector
, &dev
->mode_config
.connector_list
, head
) {
1227 /* Only handle HPD capable connectors. */
1228 if (!(connector
->polled
& DRM_CONNECTOR_POLL_HPD
))
1231 old_status
= connector
->status
;
1233 connector
->status
= connector
->funcs
->detect(connector
, false);
1234 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1236 drm_get_connector_name(connector
),
1237 drm_get_connector_status_name(old_status
),
1238 drm_get_connector_status_name(connector
->status
));
1239 if (old_status
!= connector
->status
)
1243 mutex_unlock(&dev
->mode_config
.mutex
);
1246 drm_kms_helper_hotplug_event(dev
);
1250 EXPORT_SYMBOL(drm_helper_hpd_irq_event
);