x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / gpu / drm / drm_crtc_helper.c
blobc722c3b5404d3ad06836c522b9e974ab27a3ec60
1 /*
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
23 * OF THIS SOFTWARE.
25 * Authors:
26 * Keith Packard
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>
35 #include <drm/drmP.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 /**
43 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
44 * connector list
45 * @dev: drm device to operate on
47 * Some userspace presumes that the first connected connector is the main
48 * display, where it's supposed to display e.g. the login screen. For
49 * laptops, this should be the main panel. Use this function to sort all
50 * (eDP/LVDS) panels to the front of the connector list, instead of
51 * painstakingly trying to initialize them in the right order.
53 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
55 struct drm_connector *connector, *tmp;
56 struct list_head panel_list;
58 INIT_LIST_HEAD(&panel_list);
60 list_for_each_entry_safe(connector, tmp,
61 &dev->mode_config.connector_list, head) {
62 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
63 connector->connector_type == DRM_MODE_CONNECTOR_eDP)
64 list_move_tail(&connector->head, &panel_list);
67 list_splice(&panel_list, &dev->mode_config.connector_list);
69 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
71 static bool drm_kms_helper_poll = true;
72 module_param_named(poll, drm_kms_helper_poll, bool, 0600);
74 static void drm_mode_validate_flag(struct drm_connector *connector,
75 int flags)
77 struct drm_display_mode *mode;
79 if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
80 return;
82 list_for_each_entry(mode, &connector->modes, head) {
83 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
84 !(flags & DRM_MODE_FLAG_INTERLACE))
85 mode->status = MODE_NO_INTERLACE;
86 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
87 !(flags & DRM_MODE_FLAG_DBLSCAN))
88 mode->status = MODE_NO_DBLESCAN;
91 return;
94 /**
95 * drm_helper_probe_single_connector_modes - get complete set of display modes
96 * @connector: connector to probe
97 * @maxX: max width for modes
98 * @maxY: max height for modes
100 * LOCKING:
101 * Caller must hold mode config lock.
103 * Based on the helper callbacks implemented by @connector try to detect all
104 * valid modes. Modes will first be added to the connector's probed_modes list,
105 * then culled (based on validity and the @maxX, @maxY parameters) and put into
106 * the normal modes list.
108 * Intended to be use as a generic implementation of the ->probe() @connector
109 * callback for drivers that use the crtc helpers for output mode filtering and
110 * detection.
112 * RETURNS:
113 * Number of modes found on @connector.
115 int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
116 uint32_t maxX, uint32_t maxY)
118 struct drm_device *dev = connector->dev;
119 struct drm_display_mode *mode;
120 struct drm_connector_helper_funcs *connector_funcs =
121 connector->helper_private;
122 int count = 0;
123 int mode_flags = 0;
124 bool verbose_prune = true;
126 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
127 drm_get_connector_name(connector));
128 /* set all modes to the unverified state */
129 list_for_each_entry(mode, &connector->modes, head)
130 mode->status = MODE_UNVERIFIED;
132 if (connector->force) {
133 if (connector->force == DRM_FORCE_ON)
134 connector->status = connector_status_connected;
135 else
136 connector->status = connector_status_disconnected;
137 if (connector->funcs->force)
138 connector->funcs->force(connector);
139 } else {
140 connector->status = connector->funcs->detect(connector, true);
143 /* Re-enable polling in case the global poll config changed. */
144 if (drm_kms_helper_poll != dev->mode_config.poll_running)
145 drm_kms_helper_poll_enable(dev);
147 dev->mode_config.poll_running = drm_kms_helper_poll;
149 if (connector->status == connector_status_disconnected) {
150 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
151 connector->base.id, drm_get_connector_name(connector));
152 drm_mode_connector_update_edid_property(connector, NULL);
153 verbose_prune = false;
154 goto prune;
157 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
158 count = drm_load_edid_firmware(connector);
159 if (count == 0)
160 #endif
161 count = (*connector_funcs->get_modes)(connector);
163 if (count == 0 && connector->status == connector_status_connected)
164 count = drm_add_modes_noedid(connector, 1024, 768);
165 if (count == 0)
166 goto prune;
168 drm_mode_connector_list_update(connector);
170 if (maxX && maxY)
171 drm_mode_validate_size(dev, &connector->modes, maxX,
172 maxY, 0);
174 if (connector->interlace_allowed)
175 mode_flags |= DRM_MODE_FLAG_INTERLACE;
176 if (connector->doublescan_allowed)
177 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
178 drm_mode_validate_flag(connector, mode_flags);
180 list_for_each_entry(mode, &connector->modes, head) {
181 if (mode->status == MODE_OK)
182 mode->status = connector_funcs->mode_valid(connector,
183 mode);
186 prune:
187 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
189 if (list_empty(&connector->modes))
190 return 0;
192 list_for_each_entry(mode, &connector->modes, head)
193 mode->vrefresh = drm_mode_vrefresh(mode);
195 drm_mode_sort(&connector->modes);
197 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
198 drm_get_connector_name(connector));
199 list_for_each_entry(mode, &connector->modes, head) {
200 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
201 drm_mode_debug_printmodeline(mode);
204 return count;
206 EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
209 * drm_helper_encoder_in_use - check if a given encoder is in use
210 * @encoder: encoder to check
212 * LOCKING:
213 * Caller must hold mode config lock.
215 * Walk @encoders's DRM device's mode_config and see if it's in use.
217 * RETURNS:
218 * True if @encoder is part of the mode_config, false otherwise.
220 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
222 struct drm_connector *connector;
223 struct drm_device *dev = encoder->dev;
224 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
225 if (connector->encoder == encoder)
226 return true;
227 return false;
229 EXPORT_SYMBOL(drm_helper_encoder_in_use);
232 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
233 * @crtc: CRTC to check
235 * LOCKING:
236 * Caller must hold mode config lock.
238 * Walk @crtc's DRM device's mode_config and see if it's in use.
240 * RETURNS:
241 * True if @crtc is part of the mode_config, false otherwise.
243 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
245 struct drm_encoder *encoder;
246 struct drm_device *dev = crtc->dev;
247 /* FIXME: Locking around list access? */
248 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
249 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
250 return true;
251 return false;
253 EXPORT_SYMBOL(drm_helper_crtc_in_use);
255 static void
256 drm_encoder_disable(struct drm_encoder *encoder)
258 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
260 if (encoder->bridge)
261 encoder->bridge->funcs->disable(encoder->bridge);
263 if (encoder_funcs->disable)
264 (*encoder_funcs->disable)(encoder);
265 else
266 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
268 if (encoder->bridge)
269 encoder->bridge->funcs->post_disable(encoder->bridge);
273 * drm_helper_disable_unused_functions - disable unused objects
274 * @dev: DRM device
276 * LOCKING:
277 * Caller must hold mode config lock.
279 * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
280 * by calling its dpms function, which should power it off.
282 void drm_helper_disable_unused_functions(struct drm_device *dev)
284 struct drm_encoder *encoder;
285 struct drm_connector *connector;
286 struct drm_crtc *crtc;
288 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
289 if (!connector->encoder)
290 continue;
291 if (connector->status == connector_status_disconnected)
292 connector->encoder = NULL;
295 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
296 if (!drm_helper_encoder_in_use(encoder)) {
297 drm_encoder_disable(encoder);
298 /* disconnector encoder from any connector */
299 encoder->crtc = NULL;
303 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
304 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
305 crtc->enabled = drm_helper_crtc_in_use(crtc);
306 if (!crtc->enabled) {
307 if (crtc_funcs->disable)
308 (*crtc_funcs->disable)(crtc);
309 else
310 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
311 crtc->fb = NULL;
315 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
318 * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
319 * @encoder: encoder to test
320 * @crtc: crtc to test
322 * Return false if @encoder can't be driven by @crtc, true otherwise.
324 static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
325 struct drm_crtc *crtc)
327 struct drm_device *dev;
328 struct drm_crtc *tmp;
329 int crtc_mask = 1;
331 WARN(!crtc, "checking null crtc?\n");
333 dev = crtc->dev;
335 list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
336 if (tmp == crtc)
337 break;
338 crtc_mask <<= 1;
341 if (encoder->possible_crtcs & crtc_mask)
342 return true;
343 return false;
347 * Check the CRTC we're going to map each output to vs. its current
348 * CRTC. If they don't match, we have to disable the output and the CRTC
349 * since the driver will have to re-route things.
351 static void
352 drm_crtc_prepare_encoders(struct drm_device *dev)
354 struct drm_encoder_helper_funcs *encoder_funcs;
355 struct drm_encoder *encoder;
357 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
358 encoder_funcs = encoder->helper_private;
359 /* Disable unused encoders */
360 if (encoder->crtc == NULL)
361 drm_encoder_disable(encoder);
362 /* Disable encoders whose CRTC is about to change */
363 if (encoder_funcs->get_crtc &&
364 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
365 drm_encoder_disable(encoder);
370 * drm_crtc_helper_set_mode - internal helper to set a mode
371 * @crtc: CRTC to program
372 * @mode: mode to use
373 * @x: horizontal offset into the surface
374 * @y: vertical offset into the surface
375 * @old_fb: old framebuffer, for cleanup
377 * LOCKING:
378 * Caller must hold mode config lock.
380 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
381 * to fixup or reject the mode prior to trying to set it. This is an internal
382 * helper that drivers could e.g. use to update properties that require the
383 * entire output pipe to be disabled and re-enabled in a new configuration. For
384 * example for changing whether audio is enabled on a hdmi link or for changing
385 * panel fitter or dither attributes. It is also called by the
386 * drm_crtc_helper_set_config() helper function to drive the mode setting
387 * sequence.
389 * RETURNS:
390 * True if the mode was set successfully, or false otherwise.
392 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
393 struct drm_display_mode *mode,
394 int x, int y,
395 struct drm_framebuffer *old_fb)
397 struct drm_device *dev = crtc->dev;
398 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
399 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
400 struct drm_encoder_helper_funcs *encoder_funcs;
401 int saved_x, saved_y;
402 struct drm_encoder *encoder;
403 bool ret = true;
405 crtc->enabled = drm_helper_crtc_in_use(crtc);
406 if (!crtc->enabled)
407 return true;
409 adjusted_mode = drm_mode_duplicate(dev, mode);
410 if (!adjusted_mode)
411 return false;
413 saved_hwmode = crtc->hwmode;
414 saved_mode = crtc->mode;
415 saved_x = crtc->x;
416 saved_y = crtc->y;
418 /* Update crtc values up front so the driver can rely on them for mode
419 * setting.
421 crtc->mode = *mode;
422 crtc->x = x;
423 crtc->y = y;
425 /* Pass our mode to the connectors and the CRTC to give them a chance to
426 * adjust it according to limitations or connector properties, and also
427 * a chance to reject the mode entirely.
429 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
431 if (encoder->crtc != crtc)
432 continue;
434 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
435 ret = encoder->bridge->funcs->mode_fixup(
436 encoder->bridge, mode, adjusted_mode);
437 if (!ret) {
438 DRM_DEBUG_KMS("Bridge fixup failed\n");
439 goto done;
443 encoder_funcs = encoder->helper_private;
444 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
445 adjusted_mode))) {
446 DRM_DEBUG_KMS("Encoder fixup failed\n");
447 goto done;
451 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
452 DRM_DEBUG_KMS("CRTC fixup failed\n");
453 goto done;
455 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
457 /* Prepare the encoders and CRTCs before setting the mode. */
458 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
460 if (encoder->crtc != crtc)
461 continue;
463 if (encoder->bridge)
464 encoder->bridge->funcs->disable(encoder->bridge);
466 encoder_funcs = encoder->helper_private;
467 /* Disable the encoders as the first thing we do. */
468 encoder_funcs->prepare(encoder);
470 if (encoder->bridge)
471 encoder->bridge->funcs->post_disable(encoder->bridge);
474 drm_crtc_prepare_encoders(dev);
476 crtc_funcs->prepare(crtc);
478 /* Set up the DPLL and any encoders state that needs to adjust or depend
479 * on the DPLL.
481 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
482 if (!ret)
483 goto done;
485 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
487 if (encoder->crtc != crtc)
488 continue;
490 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
491 encoder->base.id, drm_get_encoder_name(encoder),
492 mode->base.id, mode->name);
493 encoder_funcs = encoder->helper_private;
494 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
496 if (encoder->bridge && encoder->bridge->funcs->mode_set)
497 encoder->bridge->funcs->mode_set(encoder->bridge, mode,
498 adjusted_mode);
501 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
502 crtc_funcs->commit(crtc);
504 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
506 if (encoder->crtc != crtc)
507 continue;
509 if (encoder->bridge)
510 encoder->bridge->funcs->pre_enable(encoder->bridge);
512 encoder_funcs = encoder->helper_private;
513 encoder_funcs->commit(encoder);
515 if (encoder->bridge)
516 encoder->bridge->funcs->enable(encoder->bridge);
519 /* Store real post-adjustment hardware mode. */
520 crtc->hwmode = *adjusted_mode;
522 /* Calculate and store various constants which
523 * are later needed by vblank and swap-completion
524 * timestamping. They are derived from true hwmode.
526 drm_calc_timestamping_constants(crtc);
528 /* FIXME: add subpixel order */
529 done:
530 drm_mode_destroy(dev, adjusted_mode);
531 if (!ret) {
532 crtc->hwmode = saved_hwmode;
533 crtc->mode = saved_mode;
534 crtc->x = saved_x;
535 crtc->y = saved_y;
538 return ret;
540 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
543 static int
544 drm_crtc_helper_disable(struct drm_crtc *crtc)
546 struct drm_device *dev = crtc->dev;
547 struct drm_connector *connector;
548 struct drm_encoder *encoder;
550 /* Decouple all encoders and their attached connectors from this crtc */
551 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
552 if (encoder->crtc != crtc)
553 continue;
555 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
556 if (connector->encoder != encoder)
557 continue;
559 connector->encoder = NULL;
563 drm_helper_disable_unused_functions(dev);
564 return 0;
568 * drm_crtc_helper_set_config - set a new config from userspace
569 * @set: mode set configuration
571 * LOCKING:
572 * Caller must hold mode config lock.
574 * Setup a new configuration, provided by the upper layers (either an ioctl call
575 * from userspace or internally e.g. from the fbdev suppport code) in @set, and
576 * enable it. This is the main helper functions for drivers that implement
577 * kernel mode setting with the crtc helper functions and the assorted
578 * ->prepare(), ->modeset() and ->commit() helper callbacks.
580 * RETURNS:
581 * Returns 0 on success, -ERRNO on failure.
583 int drm_crtc_helper_set_config(struct drm_mode_set *set)
585 struct drm_device *dev;
586 struct drm_crtc *save_crtcs, *new_crtc, *crtc;
587 struct drm_encoder *save_encoders, *new_encoder, *encoder;
588 struct drm_framebuffer *old_fb = NULL;
589 bool mode_changed = false; /* if true do a full mode set */
590 bool fb_changed = false; /* if true and !mode_changed just do a flip */
591 struct drm_connector *save_connectors, *connector;
592 int count = 0, ro, fail = 0;
593 struct drm_crtc_helper_funcs *crtc_funcs;
594 struct drm_mode_set save_set;
595 int ret;
596 int i;
598 DRM_DEBUG_KMS("\n");
600 BUG_ON(!set);
601 BUG_ON(!set->crtc);
602 BUG_ON(!set->crtc->helper_private);
604 /* Enforce sane interface api - has been abused by the fb helper. */
605 BUG_ON(!set->mode && set->fb);
606 BUG_ON(set->fb && set->num_connectors == 0);
608 crtc_funcs = set->crtc->helper_private;
610 if (!set->mode)
611 set->fb = NULL;
613 if (set->fb) {
614 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
615 set->crtc->base.id, set->fb->base.id,
616 (int)set->num_connectors, set->x, set->y);
617 } else {
618 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
619 return drm_crtc_helper_disable(set->crtc);
622 dev = set->crtc->dev;
624 /* Allocate space for the backup of all (non-pointer) crtc, encoder and
625 * connector data. */
626 save_crtcs = kzalloc(dev->mode_config.num_crtc *
627 sizeof(struct drm_crtc), GFP_KERNEL);
628 if (!save_crtcs)
629 return -ENOMEM;
631 save_encoders = kzalloc(dev->mode_config.num_encoder *
632 sizeof(struct drm_encoder), GFP_KERNEL);
633 if (!save_encoders) {
634 kfree(save_crtcs);
635 return -ENOMEM;
638 save_connectors = kzalloc(dev->mode_config.num_connector *
639 sizeof(struct drm_connector), GFP_KERNEL);
640 if (!save_connectors) {
641 kfree(save_crtcs);
642 kfree(save_encoders);
643 return -ENOMEM;
646 /* Copy data. Note that driver private data is not affected.
647 * Should anything bad happen only the expected state is
648 * restored, not the drivers personal bookkeeping.
650 count = 0;
651 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
652 save_crtcs[count++] = *crtc;
655 count = 0;
656 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
657 save_encoders[count++] = *encoder;
660 count = 0;
661 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
662 save_connectors[count++] = *connector;
665 save_set.crtc = set->crtc;
666 save_set.mode = &set->crtc->mode;
667 save_set.x = set->crtc->x;
668 save_set.y = set->crtc->y;
669 save_set.fb = set->crtc->fb;
671 /* We should be able to check here if the fb has the same properties
672 * and then just flip_or_move it */
673 if (set->crtc->fb != set->fb) {
674 /* If we have no fb then treat it as a full mode set */
675 if (set->crtc->fb == NULL) {
676 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
677 mode_changed = true;
678 } else if (set->fb == NULL) {
679 mode_changed = true;
680 } else if (set->fb->pixel_format !=
681 set->crtc->fb->pixel_format) {
682 mode_changed = true;
683 } else
684 fb_changed = true;
687 if (set->x != set->crtc->x || set->y != set->crtc->y)
688 fb_changed = true;
690 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
691 DRM_DEBUG_KMS("modes are different, full mode set\n");
692 drm_mode_debug_printmodeline(&set->crtc->mode);
693 drm_mode_debug_printmodeline(set->mode);
694 mode_changed = true;
697 /* a) traverse passed in connector list and get encoders for them */
698 count = 0;
699 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
700 struct drm_connector_helper_funcs *connector_funcs =
701 connector->helper_private;
702 new_encoder = connector->encoder;
703 for (ro = 0; ro < set->num_connectors; ro++) {
704 if (set->connectors[ro] == connector) {
705 new_encoder = connector_funcs->best_encoder(connector);
706 /* if we can't get an encoder for a connector
707 we are setting now - then fail */
708 if (new_encoder == NULL)
709 /* don't break so fail path works correct */
710 fail = 1;
711 break;
713 if (connector->dpms != DRM_MODE_DPMS_ON) {
714 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
715 mode_changed = true;
720 if (new_encoder != connector->encoder) {
721 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
722 mode_changed = true;
723 /* If the encoder is reused for another connector, then
724 * the appropriate crtc will be set later.
726 if (connector->encoder)
727 connector->encoder->crtc = NULL;
728 connector->encoder = new_encoder;
732 if (fail) {
733 ret = -EINVAL;
734 goto fail;
737 count = 0;
738 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
739 if (!connector->encoder)
740 continue;
742 if (connector->encoder->crtc == set->crtc)
743 new_crtc = NULL;
744 else
745 new_crtc = connector->encoder->crtc;
747 for (ro = 0; ro < set->num_connectors; ro++) {
748 if (set->connectors[ro] == connector)
749 new_crtc = set->crtc;
752 /* Make sure the new CRTC will work with the encoder */
753 if (new_crtc &&
754 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
755 ret = -EINVAL;
756 goto fail;
758 if (new_crtc != connector->encoder->crtc) {
759 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
760 mode_changed = true;
761 connector->encoder->crtc = new_crtc;
763 if (new_crtc) {
764 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
765 connector->base.id, drm_get_connector_name(connector),
766 new_crtc->base.id);
767 } else {
768 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
769 connector->base.id, drm_get_connector_name(connector));
773 /* mode_set_base is not a required function */
774 if (fb_changed && !crtc_funcs->mode_set_base)
775 mode_changed = true;
777 if (mode_changed) {
778 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
779 if (set->crtc->enabled) {
780 DRM_DEBUG_KMS("attempting to set mode from"
781 " userspace\n");
782 drm_mode_debug_printmodeline(set->mode);
783 old_fb = set->crtc->fb;
784 set->crtc->fb = set->fb;
785 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
786 set->x, set->y,
787 old_fb)) {
788 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
789 set->crtc->base.id);
790 set->crtc->fb = old_fb;
791 ret = -EINVAL;
792 goto fail;
794 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
795 for (i = 0; i < set->num_connectors; i++) {
796 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
797 drm_get_connector_name(set->connectors[i]));
798 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
801 drm_helper_disable_unused_functions(dev);
802 } else if (fb_changed) {
803 set->crtc->x = set->x;
804 set->crtc->y = set->y;
806 old_fb = set->crtc->fb;
807 if (set->crtc->fb != set->fb)
808 set->crtc->fb = set->fb;
809 ret = crtc_funcs->mode_set_base(set->crtc,
810 set->x, set->y, old_fb);
811 if (ret != 0) {
812 set->crtc->fb = old_fb;
813 goto fail;
817 kfree(save_connectors);
818 kfree(save_encoders);
819 kfree(save_crtcs);
820 return 0;
822 fail:
823 /* Restore all previous data. */
824 count = 0;
825 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
826 *crtc = save_crtcs[count++];
829 count = 0;
830 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
831 *encoder = save_encoders[count++];
834 count = 0;
835 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
836 *connector = save_connectors[count++];
839 /* Try to restore the config */
840 if (mode_changed &&
841 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
842 save_set.y, save_set.fb))
843 DRM_ERROR("failed to restore config after modeset failure\n");
845 kfree(save_connectors);
846 kfree(save_encoders);
847 kfree(save_crtcs);
848 return ret;
850 EXPORT_SYMBOL(drm_crtc_helper_set_config);
852 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
854 int dpms = DRM_MODE_DPMS_OFF;
855 struct drm_connector *connector;
856 struct drm_device *dev = encoder->dev;
858 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
859 if (connector->encoder == encoder)
860 if (connector->dpms < dpms)
861 dpms = connector->dpms;
862 return dpms;
865 /* Helper which handles bridge ordering around encoder dpms */
866 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
868 struct drm_bridge *bridge = encoder->bridge;
869 struct drm_encoder_helper_funcs *encoder_funcs;
871 if (bridge) {
872 if (mode == DRM_MODE_DPMS_ON)
873 bridge->funcs->pre_enable(bridge);
874 else
875 bridge->funcs->disable(bridge);
878 encoder_funcs = encoder->helper_private;
879 if (encoder_funcs->dpms)
880 encoder_funcs->dpms(encoder, mode);
882 if (bridge) {
883 if (mode == DRM_MODE_DPMS_ON)
884 bridge->funcs->enable(bridge);
885 else
886 bridge->funcs->post_disable(bridge);
890 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
892 int dpms = DRM_MODE_DPMS_OFF;
893 struct drm_connector *connector;
894 struct drm_device *dev = crtc->dev;
896 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
897 if (connector->encoder && connector->encoder->crtc == crtc)
898 if (connector->dpms < dpms)
899 dpms = connector->dpms;
900 return dpms;
904 * drm_helper_connector_dpms() - connector dpms helper implementation
905 * @connector: affected connector
906 * @mode: DPMS mode
908 * This is the main helper function provided by the crtc helper framework for
909 * implementing the DPMS connector attribute. It computes the new desired DPMS
910 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
911 * callback provided by the driver appropriately.
913 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
915 struct drm_encoder *encoder = connector->encoder;
916 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
917 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
919 if (mode == connector->dpms)
920 return;
922 old_dpms = connector->dpms;
923 connector->dpms = mode;
925 if (encoder)
926 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
928 /* from off to on, do crtc then encoder */
929 if (mode < old_dpms) {
930 if (crtc) {
931 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
932 if (crtc_funcs->dpms)
933 (*crtc_funcs->dpms) (crtc,
934 drm_helper_choose_crtc_dpms(crtc));
936 if (encoder)
937 drm_helper_encoder_dpms(encoder, encoder_dpms);
940 /* from on to off, do encoder then crtc */
941 if (mode > old_dpms) {
942 if (encoder)
943 drm_helper_encoder_dpms(encoder, encoder_dpms);
944 if (crtc) {
945 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
946 if (crtc_funcs->dpms)
947 (*crtc_funcs->dpms) (crtc,
948 drm_helper_choose_crtc_dpms(crtc));
952 return;
954 EXPORT_SYMBOL(drm_helper_connector_dpms);
956 int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
957 struct drm_mode_fb_cmd2 *mode_cmd)
959 int i;
961 fb->width = mode_cmd->width;
962 fb->height = mode_cmd->height;
963 for (i = 0; i < 4; i++) {
964 fb->pitches[i] = mode_cmd->pitches[i];
965 fb->offsets[i] = mode_cmd->offsets[i];
967 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
968 &fb->bits_per_pixel);
969 fb->pixel_format = mode_cmd->pixel_format;
971 return 0;
973 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
975 int drm_helper_resume_force_mode(struct drm_device *dev)
977 struct drm_crtc *crtc;
978 struct drm_encoder *encoder;
979 struct drm_crtc_helper_funcs *crtc_funcs;
980 int ret, encoder_dpms;
982 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
984 if (!crtc->enabled)
985 continue;
987 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
988 crtc->x, crtc->y, crtc->fb);
990 if (ret == false)
991 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
993 /* Turn off outputs that were already powered off */
994 if (drm_helper_choose_crtc_dpms(crtc)) {
995 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
997 if(encoder->crtc != crtc)
998 continue;
1000 encoder_dpms = drm_helper_choose_encoder_dpms(
1001 encoder);
1003 drm_helper_encoder_dpms(encoder, encoder_dpms);
1006 crtc_funcs = crtc->helper_private;
1007 if (crtc_funcs->dpms)
1008 (*crtc_funcs->dpms) (crtc,
1009 drm_helper_choose_crtc_dpms(crtc));
1012 /* disable the unused connectors while restoring the modesetting */
1013 drm_helper_disable_unused_functions(dev);
1014 return 0;
1016 EXPORT_SYMBOL(drm_helper_resume_force_mode);
1018 void drm_kms_helper_hotplug_event(struct drm_device *dev)
1020 /* send a uevent + call fbdev */
1021 drm_sysfs_hotplug_event(dev);
1022 if (dev->mode_config.funcs->output_poll_changed)
1023 dev->mode_config.funcs->output_poll_changed(dev);
1025 EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
1027 #define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1028 static void output_poll_execute(struct work_struct *work)
1030 struct delayed_work *delayed_work = to_delayed_work(work);
1031 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
1032 struct drm_connector *connector;
1033 enum drm_connector_status old_status;
1034 bool repoll = false, changed = false;
1036 if (!drm_kms_helper_poll)
1037 return;
1039 mutex_lock(&dev->mode_config.mutex);
1040 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1042 /* Ignore forced connectors. */
1043 if (connector->force)
1044 continue;
1046 /* Ignore HPD capable connectors and connectors where we don't
1047 * want any hotplug detection at all for polling. */
1048 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
1049 continue;
1051 repoll = true;
1053 old_status = connector->status;
1054 /* if we are connected and don't want to poll for disconnect
1055 skip it */
1056 if (old_status == connector_status_connected &&
1057 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1058 continue;
1060 connector->status = connector->funcs->detect(connector, false);
1061 if (old_status != connector->status) {
1062 const char *old, *new;
1064 old = drm_get_connector_status_name(old_status);
1065 new = drm_get_connector_status_name(connector->status);
1067 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1068 "status updated from %s to %s\n",
1069 connector->base.id,
1070 drm_get_connector_name(connector),
1071 old, new);
1073 changed = true;
1077 mutex_unlock(&dev->mode_config.mutex);
1079 if (changed)
1080 drm_kms_helper_hotplug_event(dev);
1082 if (repoll)
1083 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1086 void drm_kms_helper_poll_disable(struct drm_device *dev)
1088 if (!dev->mode_config.poll_enabled)
1089 return;
1090 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1092 EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1094 void drm_kms_helper_poll_enable(struct drm_device *dev)
1096 bool poll = false;
1097 struct drm_connector *connector;
1099 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1100 return;
1102 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1103 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1104 DRM_CONNECTOR_POLL_DISCONNECT))
1105 poll = true;
1108 if (poll)
1109 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1111 EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1113 void drm_kms_helper_poll_init(struct drm_device *dev)
1115 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1116 dev->mode_config.poll_enabled = true;
1118 drm_kms_helper_poll_enable(dev);
1120 EXPORT_SYMBOL(drm_kms_helper_poll_init);
1122 void drm_kms_helper_poll_fini(struct drm_device *dev)
1124 drm_kms_helper_poll_disable(dev);
1126 EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1128 void drm_helper_hpd_irq_event(struct drm_device *dev)
1130 struct drm_connector *connector;
1131 enum drm_connector_status old_status;
1132 bool changed = false;
1134 if (!dev->mode_config.poll_enabled)
1135 return;
1137 mutex_lock(&dev->mode_config.mutex);
1138 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1140 /* Only handle HPD capable connectors. */
1141 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1142 continue;
1144 old_status = connector->status;
1146 connector->status = connector->funcs->detect(connector, false);
1147 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1148 connector->base.id,
1149 drm_get_connector_name(connector),
1150 drm_get_connector_status_name(old_status),
1151 drm_get_connector_status_name(connector->status));
1152 if (old_status != connector->status)
1153 changed = true;
1156 mutex_unlock(&dev->mode_config.mutex);
1158 if (changed)
1159 drm_kms_helper_hotplug_event(dev);
1161 EXPORT_SYMBOL(drm_helper_hpd_irq_event);