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1/*
2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
4 *
5 * DRM core CRTC related functions
6 *
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.
16 *
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.
24 *
25 * Authors:
26 * Keith Packard
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
30 */
31
32#include <linux/export.h>
33#include <linux/kernel.h>
34#include <linux/moduleparam.h>
35
36#include <drm/drm_atomic.h>
37#include <drm/drm_atomic_helper.h>
38#include <drm/drm_atomic_uapi.h>
39#include <drm/drm_bridge.h>
40#include <drm/drm_crtc.h>
41#include <drm/drm_crtc_helper.h>
42#include <drm/drm_drv.h>
43#include <drm/drm_edid.h>
44#include <drm/drm_encoder.h>
45#include <drm/drm_fb_helper.h>
46#include <drm/drm_fourcc.h>
47#include <drm/drm_plane_helper.h>
48#include <drm/drm_print.h>
49#include <drm/drm_vblank.h>
50
51#include "drm_crtc_helper_internal.h"
52
53/**
54 * DOC: overview
55 *
56 * The CRTC modeset helper library provides a default set_config implementation
57 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
58 * the same callbacks which drivers can use to e.g. restore the modeset
59 * configuration on resume with drm_helper_resume_force_mode().
60 *
61 * Note that this helper library doesn't track the current power state of CRTCs
62 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even
63 * though the hardware is already in the desired state. This deficiency has been
64 * fixed in the atomic helpers.
65 *
66 * The driver callbacks are mostly compatible with the atomic modeset helpers,
67 * except for the handling of the primary plane: Atomic helpers require that the
68 * primary plane is implemented as a real standalone plane and not directly tied
69 * to the CRTC state. For easier transition this library provides functions to
70 * implement the old semantics required by the CRTC helpers using the new plane
71 * and atomic helper callbacks.
72 *
73 * Drivers are strongly urged to convert to the atomic helpers (by way of first
74 * converting to the plane helpers). New drivers must not use these functions
75 * but need to implement the atomic interface instead, potentially using the
76 * atomic helpers for that.
77 *
78 * These legacy modeset helpers use the same function table structures as
79 * all other modesetting helpers. See the documentation for struct
80 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct
81 * &drm_connector_helper_funcs.
82 */
83
84/**
85 * drm_helper_encoder_in_use - check if a given encoder is in use
86 * @encoder: encoder to check
87 *
88 * Checks whether @encoder is with the current mode setting output configuration
89 * in use by any connector. This doesn't mean that it is actually enabled since
90 * the DPMS state is tracked separately.
91 *
92 * Returns:
93 * True if @encoder is used, false otherwise.
94 */
95bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
96{
97 struct drm_connector *connector;
98 struct drm_connector_list_iter conn_iter;
99 struct drm_device *dev = encoder->dev;
100
101 WARN_ON(drm_drv_uses_atomic_modeset(dev));
102
103 /*
104 * We can expect this mutex to be locked if we are not panicking.
105 * Locking is currently fubar in the panic handler.
106 */
107 if (!oops_in_progress) {
108 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
109 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
110 }
111
112
113 drm_connector_list_iter_begin(dev, &conn_iter);
114 drm_for_each_connector_iter(connector, &conn_iter) {
115 if (connector->encoder == encoder) {
116 drm_connector_list_iter_end(&conn_iter);
117 return true;
118 }
119 }
120 drm_connector_list_iter_end(&conn_iter);
121 return false;
122}
123EXPORT_SYMBOL(drm_helper_encoder_in_use);
124
125/**
126 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
127 * @crtc: CRTC to check
128 *
129 * Checks whether @crtc is with the current mode setting output configuration
130 * in use by any connector. This doesn't mean that it is actually enabled since
131 * the DPMS state is tracked separately.
132 *
133 * Returns:
134 * True if @crtc is used, false otherwise.
135 */
136bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
137{
138 struct drm_encoder *encoder;
139 struct drm_device *dev = crtc->dev;
140
141 WARN_ON(drm_drv_uses_atomic_modeset(dev));
142
143 /*
144 * We can expect this mutex to be locked if we are not panicking.
145 * Locking is currently fubar in the panic handler.
146 */
147 if (!oops_in_progress)
148 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
149
150 drm_for_each_encoder(encoder, dev)
151 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
152 return true;
153 return false;
154}
155EXPORT_SYMBOL(drm_helper_crtc_in_use);
156
157static void
158drm_encoder_disable(struct drm_encoder *encoder)
159{
160 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
161
162 if (!encoder_funcs)
163 return;
164
165 if (encoder_funcs->disable)
166 (*encoder_funcs->disable)(encoder);
167 else if (encoder_funcs->dpms)
168 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
169}
170
171static void __drm_helper_disable_unused_functions(struct drm_device *dev)
172{
173 struct drm_encoder *encoder;
174 struct drm_crtc *crtc;
175
176 drm_warn_on_modeset_not_all_locked(dev);
177
178 drm_for_each_encoder(encoder, dev) {
179 if (!drm_helper_encoder_in_use(encoder)) {
180 drm_encoder_disable(encoder);
181 /* disconnect encoder from any connector */
182 encoder->crtc = NULL;
183 }
184 }
185
186 drm_for_each_crtc(crtc, dev) {
187 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
188
189 crtc->enabled = drm_helper_crtc_in_use(crtc);
190 if (!crtc->enabled) {
191 if (crtc_funcs->disable)
192 (*crtc_funcs->disable)(crtc);
193 else
194 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
195 crtc->primary->fb = NULL;
196 }
197 }
198}
199
200/**
201 * drm_helper_disable_unused_functions - disable unused objects
202 * @dev: DRM device
203 *
204 * This function walks through the entire mode setting configuration of @dev. It
205 * will remove any CRTC links of unused encoders and encoder links of
206 * disconnected connectors. Then it will disable all unused encoders and CRTCs
207 * either by calling their disable callback if available or by calling their
208 * dpms callback with DRM_MODE_DPMS_OFF.
209 *
210 * NOTE:
211 *
212 * This function is part of the legacy modeset helper library and will cause
213 * major confusion with atomic drivers. This is because atomic helpers guarantee
214 * to never call ->disable() hooks on a disabled function, or ->enable() hooks
215 * on an enabled functions. drm_helper_disable_unused_functions() on the other
216 * hand throws such guarantees into the wind and calls disable hooks
217 * unconditionally on unused functions.
218 */
219void drm_helper_disable_unused_functions(struct drm_device *dev)
220{
221 WARN_ON(drm_drv_uses_atomic_modeset(dev));
222
223 drm_modeset_lock_all(dev);
224 __drm_helper_disable_unused_functions(dev);
225 drm_modeset_unlock_all(dev);
226}
227EXPORT_SYMBOL(drm_helper_disable_unused_functions);
228
229/*
230 * Check the CRTC we're going to map each output to vs. its current
231 * CRTC. If they don't match, we have to disable the output and the CRTC
232 * since the driver will have to re-route things.
233 */
234static void
235drm_crtc_prepare_encoders(struct drm_device *dev)
236{
237 const struct drm_encoder_helper_funcs *encoder_funcs;
238 struct drm_encoder *encoder;
239
240 drm_for_each_encoder(encoder, dev) {
241 encoder_funcs = encoder->helper_private;
242 if (!encoder_funcs)
243 continue;
244
245 /* Disable unused encoders */
246 if (encoder->crtc == NULL)
247 drm_encoder_disable(encoder);
248 }
249}
250
251/**
252 * drm_crtc_helper_set_mode - internal helper to set a mode
253 * @crtc: CRTC to program
254 * @mode: mode to use
255 * @x: horizontal offset into the surface
256 * @y: vertical offset into the surface
257 * @old_fb: old framebuffer, for cleanup
258 *
259 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
260 * to fixup or reject the mode prior to trying to set it. This is an internal
261 * helper that drivers could e.g. use to update properties that require the
262 * entire output pipe to be disabled and re-enabled in a new configuration. For
263 * example for changing whether audio is enabled on a hdmi link or for changing
264 * panel fitter or dither attributes. It is also called by the
265 * drm_crtc_helper_set_config() helper function to drive the mode setting
266 * sequence.
267 *
268 * Returns:
269 * True if the mode was set successfully, false otherwise.
270 */
271bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
272 struct drm_display_mode *mode,
273 int x, int y,
274 struct drm_framebuffer *old_fb)
275{
276 struct drm_device *dev = crtc->dev;
277 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
278 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
279 const struct drm_encoder_helper_funcs *encoder_funcs;
280 int saved_x, saved_y;
281 bool saved_enabled;
282 struct drm_encoder *encoder;
283 bool ret = true;
284
285 WARN_ON(drm_drv_uses_atomic_modeset(dev));
286
287 drm_warn_on_modeset_not_all_locked(dev);
288
289 saved_enabled = crtc->enabled;
290 crtc->enabled = drm_helper_crtc_in_use(crtc);
291 if (!crtc->enabled)
292 return true;
293
294 adjusted_mode = drm_mode_duplicate(dev, mode);
295 if (!adjusted_mode) {
296 crtc->enabled = saved_enabled;
297 return false;
298 }
299
300 saved_mode = crtc->mode;
301 saved_hwmode = crtc->hwmode;
302 saved_x = crtc->x;
303 saved_y = crtc->y;
304
305 /* Update crtc values up front so the driver can rely on them for mode
306 * setting.
307 */
308 crtc->mode = *mode;
309 crtc->x = x;
310 crtc->y = y;
311
312 /* Pass our mode to the connectors and the CRTC to give them a chance to
313 * adjust it according to limitations or connector properties, and also
314 * a chance to reject the mode entirely.
315 */
316 drm_for_each_encoder(encoder, dev) {
317
318 if (encoder->crtc != crtc)
319 continue;
320
321 encoder_funcs = encoder->helper_private;
322 if (!encoder_funcs)
323 continue;
324
325 encoder_funcs = encoder->helper_private;
326 if (encoder_funcs->mode_fixup) {
327 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
328 adjusted_mode))) {
329 DRM_DEBUG_KMS("Encoder fixup failed\n");
330 goto done;
331 }
332 }
333 }
334
335 if (crtc_funcs->mode_fixup) {
336 if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
337 adjusted_mode))) {
338 DRM_DEBUG_KMS("CRTC fixup failed\n");
339 goto done;
340 }
341 }
342 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
343
344 crtc->hwmode = *adjusted_mode;
345
346 /* Prepare the encoders and CRTCs before setting the mode. */
347 drm_for_each_encoder(encoder, dev) {
348
349 if (encoder->crtc != crtc)
350 continue;
351
352 encoder_funcs = encoder->helper_private;
353 if (!encoder_funcs)
354 continue;
355
356 /* Disable the encoders as the first thing we do. */
357 if (encoder_funcs->prepare)
358 encoder_funcs->prepare(encoder);
359 }
360
361 drm_crtc_prepare_encoders(dev);
362
363 crtc_funcs->prepare(crtc);
364
365 /* Set up the DPLL and any encoders state that needs to adjust or depend
366 * on the DPLL.
367 */
368 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
369 if (!ret)
370 goto done;
371
372 drm_for_each_encoder(encoder, dev) {
373
374 if (encoder->crtc != crtc)
375 continue;
376
377 encoder_funcs = encoder->helper_private;
378 if (!encoder_funcs)
379 continue;
380
381 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%s]\n",
382 encoder->base.id, encoder->name, mode->name);
383 if (encoder_funcs->mode_set)
384 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
385 }
386
387 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
388 crtc_funcs->commit(crtc);
389
390 drm_for_each_encoder(encoder, dev) {
391
392 if (encoder->crtc != crtc)
393 continue;
394
395 encoder_funcs = encoder->helper_private;
396 if (!encoder_funcs)
397 continue;
398
399 if (encoder_funcs->commit)
400 encoder_funcs->commit(encoder);
401 }
402
403 /* Calculate and store various constants which
404 * are later needed by vblank and swap-completion
405 * timestamping. They are derived from true hwmode.
406 */
407 drm_calc_timestamping_constants(crtc, &crtc->hwmode);
408
409 /* FIXME: add subpixel order */
410done:
411 drm_mode_destroy(dev, adjusted_mode);
412 if (!ret) {
413 crtc->enabled = saved_enabled;
414 crtc->mode = saved_mode;
415 crtc->hwmode = saved_hwmode;
416 crtc->x = saved_x;
417 crtc->y = saved_y;
418 }
419
420 return ret;
421}
422EXPORT_SYMBOL(drm_crtc_helper_set_mode);
423
424static void
425drm_crtc_helper_disable(struct drm_crtc *crtc)
426{
427 struct drm_device *dev = crtc->dev;
428 struct drm_connector *connector;
429 struct drm_encoder *encoder;
430
431 /* Decouple all encoders and their attached connectors from this crtc */
432 drm_for_each_encoder(encoder, dev) {
433 struct drm_connector_list_iter conn_iter;
434
435 if (encoder->crtc != crtc)
436 continue;
437
438 drm_connector_list_iter_begin(dev, &conn_iter);
439 drm_for_each_connector_iter(connector, &conn_iter) {
440 if (connector->encoder != encoder)
441 continue;
442
443 connector->encoder = NULL;
444
445 /*
446 * drm_helper_disable_unused_functions() ought to be
447 * doing this, but since we've decoupled the encoder
448 * from the connector above, the required connection
449 * between them is henceforth no longer available.
450 */
451 connector->dpms = DRM_MODE_DPMS_OFF;
452
453 /* we keep a reference while the encoder is bound */
454 drm_connector_put(connector);
455 }
456 drm_connector_list_iter_end(&conn_iter);
457 }
458
459 __drm_helper_disable_unused_functions(dev);
460}
461
462/*
463 * For connectors that support multiple encoders, either the
464 * .atomic_best_encoder() or .best_encoder() operation must be implemented.
465 */
466struct drm_encoder *
467drm_connector_get_single_encoder(struct drm_connector *connector)
468{
469 struct drm_encoder *encoder;
470
471 WARN_ON(hweight32(connector->possible_encoders) > 1);
472 drm_connector_for_each_possible_encoder(connector, encoder)
473 return encoder;
474
475 return NULL;
476}
477
478/**
479 * drm_crtc_helper_set_config - set a new config from userspace
480 * @set: mode set configuration
481 * @ctx: lock acquire context, not used here
482 *
483 * The drm_crtc_helper_set_config() helper function implements the of
484 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
485 * helpers.
486 *
487 * It first tries to locate the best encoder for each connector by calling the
488 * connector @drm_connector_helper_funcs.best_encoder helper operation.
489 *
490 * After locating the appropriate encoders, the helper function will call the
491 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
492 * or reject it completely in which case an error will be returned to the
493 * application. If the new configuration after mode adjustment is identical to
494 * the current configuration the helper function will return without performing
495 * any other operation.
496 *
497 * If the adjusted mode is identical to the current mode but changes to the
498 * frame buffer need to be applied, the drm_crtc_helper_set_config() function
499 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
500 *
501 * If the adjusted mode differs from the current mode, or if the
502 * ->mode_set_base() helper operation is not provided, the helper function
503 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
504 * and ->commit() CRTC and encoder helper operations, in that order.
505 * Alternatively it can also use the dpms and disable helper operations. For
506 * details see &struct drm_crtc_helper_funcs and struct
507 * &drm_encoder_helper_funcs.
508 *
509 * This function is deprecated. New drivers must implement atomic modeset
510 * support, for which this function is unsuitable. Instead drivers should use
511 * drm_atomic_helper_set_config().
512 *
513 * Returns:
514 * Returns 0 on success, negative errno numbers on failure.
515 */
516int drm_crtc_helper_set_config(struct drm_mode_set *set,
517 struct drm_modeset_acquire_ctx *ctx)
518{
519 struct drm_device *dev;
520 struct drm_crtc **save_encoder_crtcs, *new_crtc;
521 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
522 bool mode_changed = false; /* if true do a full mode set */
523 bool fb_changed = false; /* if true and !mode_changed just do a flip */
524 struct drm_connector *connector;
525 struct drm_connector_list_iter conn_iter;
526 int count = 0, ro, fail = 0;
527 const struct drm_crtc_helper_funcs *crtc_funcs;
528 struct drm_mode_set save_set;
529 int ret;
530 int i;
531
532 DRM_DEBUG_KMS("\n");
533
534 BUG_ON(!set);
535 BUG_ON(!set->crtc);
536 BUG_ON(!set->crtc->helper_private);
537
538 /* Enforce sane interface api - has been abused by the fb helper. */
539 BUG_ON(!set->mode && set->fb);
540 BUG_ON(set->fb && set->num_connectors == 0);
541
542 crtc_funcs = set->crtc->helper_private;
543
544 dev = set->crtc->dev;
545 WARN_ON(drm_drv_uses_atomic_modeset(dev));
546
547 if (!set->mode)
548 set->fb = NULL;
549
550 if (set->fb) {
551 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
552 set->crtc->base.id, set->crtc->name,
553 set->fb->base.id,
554 (int)set->num_connectors, set->x, set->y);
555 } else {
556 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
557 set->crtc->base.id, set->crtc->name);
558 drm_crtc_helper_disable(set->crtc);
559 return 0;
560 }
561
562 drm_warn_on_modeset_not_all_locked(dev);
563
564 /*
565 * Allocate space for the backup of all (non-pointer) encoder and
566 * connector data.
567 */
568 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder,
569 sizeof(struct drm_crtc *), GFP_KERNEL);
570 if (!save_encoder_crtcs)
571 return -ENOMEM;
572
573 save_connector_encoders = kcalloc(dev->mode_config.num_connector,
574 sizeof(struct drm_encoder *), GFP_KERNEL);
575 if (!save_connector_encoders) {
576 kfree(save_encoder_crtcs);
577 return -ENOMEM;
578 }
579
580 /*
581 * Copy data. Note that driver private data is not affected.
582 * Should anything bad happen only the expected state is
583 * restored, not the drivers personal bookkeeping.
584 */
585 count = 0;
586 drm_for_each_encoder(encoder, dev) {
587 save_encoder_crtcs[count++] = encoder->crtc;
588 }
589
590 count = 0;
591 drm_connector_list_iter_begin(dev, &conn_iter);
592 drm_for_each_connector_iter(connector, &conn_iter)
593 save_connector_encoders[count++] = connector->encoder;
594 drm_connector_list_iter_end(&conn_iter);
595
596 save_set.crtc = set->crtc;
597 save_set.mode = &set->crtc->mode;
598 save_set.x = set->crtc->x;
599 save_set.y = set->crtc->y;
600 save_set.fb = set->crtc->primary->fb;
601
602 /* We should be able to check here if the fb has the same properties
603 * and then just flip_or_move it */
604 if (set->crtc->primary->fb != set->fb) {
605 /* If we have no fb then treat it as a full mode set */
606 if (set->crtc->primary->fb == NULL) {
607 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
608 mode_changed = true;
609 } else if (set->fb->format != set->crtc->primary->fb->format) {
610 mode_changed = true;
611 } else
612 fb_changed = true;
613 }
614
615 if (set->x != set->crtc->x || set->y != set->crtc->y)
616 fb_changed = true;
617
618 if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
619 DRM_DEBUG_KMS("modes are different, full mode set\n");
620 drm_mode_debug_printmodeline(&set->crtc->mode);
621 drm_mode_debug_printmodeline(set->mode);
622 mode_changed = true;
623 }
624
625 /* take a reference on all unbound connectors in set, reuse the
626 * already taken reference for bound connectors
627 */
628 for (ro = 0; ro < set->num_connectors; ro++) {
629 if (set->connectors[ro]->encoder)
630 continue;
631 drm_connector_get(set->connectors[ro]);
632 }
633
634 /* a) traverse passed in connector list and get encoders for them */
635 count = 0;
636 drm_connector_list_iter_begin(dev, &conn_iter);
637 drm_for_each_connector_iter(connector, &conn_iter) {
638 const struct drm_connector_helper_funcs *connector_funcs =
639 connector->helper_private;
640 new_encoder = connector->encoder;
641 for (ro = 0; ro < set->num_connectors; ro++) {
642 if (set->connectors[ro] == connector) {
643 if (connector_funcs->best_encoder)
644 new_encoder = connector_funcs->best_encoder(connector);
645 else
646 new_encoder = drm_connector_get_single_encoder(connector);
647
648 /* if we can't get an encoder for a connector
649 we are setting now - then fail */
650 if (new_encoder == NULL)
651 /* don't break so fail path works correct */
652 fail = 1;
653
654 if (connector->dpms != DRM_MODE_DPMS_ON) {
655 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
656 mode_changed = true;
657 }
658
659 break;
660 }
661 }
662
663 if (new_encoder != connector->encoder) {
664 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
665 mode_changed = true;
666 /* If the encoder is reused for another connector, then
667 * the appropriate crtc will be set later.
668 */
669 if (connector->encoder)
670 connector->encoder->crtc = NULL;
671 connector->encoder = new_encoder;
672 }
673 }
674 drm_connector_list_iter_end(&conn_iter);
675
676 if (fail) {
677 ret = -EINVAL;
678 goto fail;
679 }
680
681 count = 0;
682 drm_connector_list_iter_begin(dev, &conn_iter);
683 drm_for_each_connector_iter(connector, &conn_iter) {
684 if (!connector->encoder)
685 continue;
686
687 if (connector->encoder->crtc == set->crtc)
688 new_crtc = NULL;
689 else
690 new_crtc = connector->encoder->crtc;
691
692 for (ro = 0; ro < set->num_connectors; ro++) {
693 if (set->connectors[ro] == connector)
694 new_crtc = set->crtc;
695 }
696
697 /* Make sure the new CRTC will work with the encoder */
698 if (new_crtc &&
699 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
700 ret = -EINVAL;
701 drm_connector_list_iter_end(&conn_iter);
702 goto fail;
703 }
704 if (new_crtc != connector->encoder->crtc) {
705 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
706 mode_changed = true;
707 connector->encoder->crtc = new_crtc;
708 }
709 if (new_crtc) {
710 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
711 connector->base.id, connector->name,
712 new_crtc->base.id, new_crtc->name);
713 } else {
714 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
715 connector->base.id, connector->name);
716 }
717 }
718 drm_connector_list_iter_end(&conn_iter);
719
720 /* mode_set_base is not a required function */
721 if (fb_changed && !crtc_funcs->mode_set_base)
722 mode_changed = true;
723
724 if (mode_changed) {
725 if (drm_helper_crtc_in_use(set->crtc)) {
726 DRM_DEBUG_KMS("attempting to set mode from"
727 " userspace\n");
728 drm_mode_debug_printmodeline(set->mode);
729 set->crtc->primary->fb = set->fb;
730 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
731 set->x, set->y,
732 save_set.fb)) {
733 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
734 set->crtc->base.id, set->crtc->name);
735 set->crtc->primary->fb = save_set.fb;
736 ret = -EINVAL;
737 goto fail;
738 }
739 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
740 for (i = 0; i < set->num_connectors; i++) {
741 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
742 set->connectors[i]->name);
743 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
744 }
745 }
746 __drm_helper_disable_unused_functions(dev);
747 } else if (fb_changed) {
748 set->crtc->x = set->x;
749 set->crtc->y = set->y;
750 set->crtc->primary->fb = set->fb;
751 ret = crtc_funcs->mode_set_base(set->crtc,
752 set->x, set->y, save_set.fb);
753 if (ret != 0) {
754 set->crtc->x = save_set.x;
755 set->crtc->y = save_set.y;
756 set->crtc->primary->fb = save_set.fb;
757 goto fail;
758 }
759 }
760
761 kfree(save_connector_encoders);
762 kfree(save_encoder_crtcs);
763 return 0;
764
765fail:
766 /* Restore all previous data. */
767 count = 0;
768 drm_for_each_encoder(encoder, dev) {
769 encoder->crtc = save_encoder_crtcs[count++];
770 }
771
772 count = 0;
773 drm_connector_list_iter_begin(dev, &conn_iter);
774 drm_for_each_connector_iter(connector, &conn_iter)
775 connector->encoder = save_connector_encoders[count++];
776 drm_connector_list_iter_end(&conn_iter);
777
778 /* after fail drop reference on all unbound connectors in set, let
779 * bound connectors keep their reference
780 */
781 for (ro = 0; ro < set->num_connectors; ro++) {
782 if (set->connectors[ro]->encoder)
783 continue;
784 drm_connector_put(set->connectors[ro]);
785 }
786
787 /* Try to restore the config */
788 if (mode_changed &&
789 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
790 save_set.y, save_set.fb))
791 DRM_ERROR("failed to restore config after modeset failure\n");
792
793 kfree(save_connector_encoders);
794 kfree(save_encoder_crtcs);
795 return ret;
796}
797EXPORT_SYMBOL(drm_crtc_helper_set_config);
798
799static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
800{
801 int dpms = DRM_MODE_DPMS_OFF;
802 struct drm_connector *connector;
803 struct drm_connector_list_iter conn_iter;
804 struct drm_device *dev = encoder->dev;
805
806 drm_connector_list_iter_begin(dev, &conn_iter);
807 drm_for_each_connector_iter(connector, &conn_iter)
808 if (connector->encoder == encoder)
809 if (connector->dpms < dpms)
810 dpms = connector->dpms;
811 drm_connector_list_iter_end(&conn_iter);
812
813 return dpms;
814}
815
816/* Helper which handles bridge ordering around encoder dpms */
817static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
818{
819 const struct drm_encoder_helper_funcs *encoder_funcs;
820
821 encoder_funcs = encoder->helper_private;
822 if (!encoder_funcs)
823 return;
824
825 if (encoder_funcs->dpms)
826 encoder_funcs->dpms(encoder, mode);
827}
828
829static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
830{
831 int dpms = DRM_MODE_DPMS_OFF;
832 struct drm_connector *connector;
833 struct drm_connector_list_iter conn_iter;
834 struct drm_device *dev = crtc->dev;
835
836 drm_connector_list_iter_begin(dev, &conn_iter);
837 drm_for_each_connector_iter(connector, &conn_iter)
838 if (connector->encoder && connector->encoder->crtc == crtc)
839 if (connector->dpms < dpms)
840 dpms = connector->dpms;
841 drm_connector_list_iter_end(&conn_iter);
842
843 return dpms;
844}
845
846/**
847 * drm_helper_connector_dpms() - connector dpms helper implementation
848 * @connector: affected connector
849 * @mode: DPMS mode
850 *
851 * The drm_helper_connector_dpms() helper function implements the
852 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
853 * helpers.
854 *
855 * This is the main helper function provided by the CRTC helper framework for
856 * implementing the DPMS connector attribute. It computes the new desired DPMS
857 * state for all encoders and CRTCs in the output mesh and calls the
858 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
859 * provided by the driver.
860 *
861 * This function is deprecated. New drivers must implement atomic modeset
862 * support, where DPMS is handled in the DRM core.
863 *
864 * Returns:
865 * Always returns 0.
866 */
867int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
868{
869 struct drm_encoder *encoder = connector->encoder;
870 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
871 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
872
873 WARN_ON(drm_drv_uses_atomic_modeset(connector->dev));
874
875 if (mode == connector->dpms)
876 return 0;
877
878 old_dpms = connector->dpms;
879 connector->dpms = mode;
880
881 if (encoder)
882 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
883
884 /* from off to on, do crtc then encoder */
885 if (mode < old_dpms) {
886 if (crtc) {
887 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
888
889 if (crtc_funcs->dpms)
890 (*crtc_funcs->dpms) (crtc,
891 drm_helper_choose_crtc_dpms(crtc));
892 }
893 if (encoder)
894 drm_helper_encoder_dpms(encoder, encoder_dpms);
895 }
896
897 /* from on to off, do encoder then crtc */
898 if (mode > old_dpms) {
899 if (encoder)
900 drm_helper_encoder_dpms(encoder, encoder_dpms);
901 if (crtc) {
902 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
903
904 if (crtc_funcs->dpms)
905 (*crtc_funcs->dpms) (crtc,
906 drm_helper_choose_crtc_dpms(crtc));
907 }
908 }
909
910 return 0;
911}
912EXPORT_SYMBOL(drm_helper_connector_dpms);
913
914/**
915 * drm_helper_resume_force_mode - force-restore mode setting configuration
916 * @dev: drm_device which should be restored
917 *
918 * Drivers which use the mode setting helpers can use this function to
919 * force-restore the mode setting configuration e.g. on resume or when something
920 * else might have trampled over the hw state (like some overzealous old BIOSen
921 * tended to do).
922 *
923 * This helper doesn't provide a error return value since restoring the old
924 * config should never fail due to resource allocation issues since the driver
925 * has successfully set the restored configuration already. Hence this should
926 * boil down to the equivalent of a few dpms on calls, which also don't provide
927 * an error code.
928 *
929 * Drivers where simply restoring an old configuration again might fail (e.g.
930 * due to slight differences in allocating shared resources when the
931 * configuration is restored in a different order than when userspace set it up)
932 * need to use their own restore logic.
933 *
934 * This function is deprecated. New drivers should implement atomic mode-
935 * setting and use the atomic suspend/resume helpers.
936 *
937 * See also:
938 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
939 */
940void drm_helper_resume_force_mode(struct drm_device *dev)
941{
942 struct drm_crtc *crtc;
943 struct drm_encoder *encoder;
944 const struct drm_crtc_helper_funcs *crtc_funcs;
945 int encoder_dpms;
946 bool ret;
947
948 WARN_ON(drm_drv_uses_atomic_modeset(dev));
949
950 drm_modeset_lock_all(dev);
951 drm_for_each_crtc(crtc, dev) {
952
953 if (!crtc->enabled)
954 continue;
955
956 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
957 crtc->x, crtc->y, crtc->primary->fb);
958
959 /* Restoring the old config should never fail! */
960 if (ret == false)
961 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
962
963 /* Turn off outputs that were already powered off */
964 if (drm_helper_choose_crtc_dpms(crtc)) {
965 drm_for_each_encoder(encoder, dev) {
966
967 if(encoder->crtc != crtc)
968 continue;
969
970 encoder_dpms = drm_helper_choose_encoder_dpms(
971 encoder);
972
973 drm_helper_encoder_dpms(encoder, encoder_dpms);
974 }
975
976 crtc_funcs = crtc->helper_private;
977 if (crtc_funcs->dpms)
978 (*crtc_funcs->dpms) (crtc,
979 drm_helper_choose_crtc_dpms(crtc));
980 }
981 }
982
983 /* disable the unused connectors while restoring the modesetting */
984 __drm_helper_disable_unused_functions(dev);
985 drm_modeset_unlock_all(dev);
986}
987EXPORT_SYMBOL(drm_helper_resume_force_mode);
988
989/**
990 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs
991 * @dev: DRM device whose CRTCs to turn off
992 *
993 * Drivers may want to call this on unload to ensure that all displays are
994 * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
995 *
996 * Note: This should only be used by non-atomic legacy drivers. For an atomic
997 * version look at drm_atomic_helper_shutdown().
998 *
999 * Returns:
1000 * Zero on success, error code on failure.
1001 */
1002int drm_helper_force_disable_all(struct drm_device *dev)
1003{
1004 struct drm_crtc *crtc;
1005 int ret = 0;
1006
1007 drm_modeset_lock_all(dev);
1008 drm_for_each_crtc(crtc, dev)
1009 if (crtc->enabled) {
1010 struct drm_mode_set set = {
1011 .crtc = crtc,
1012 };
1013
1014 ret = drm_mode_set_config_internal(&set);
1015 if (ret)
1016 goto out;
1017 }
1018out:
1019 drm_modeset_unlock_all(dev);
1020 return ret;
1021}
1022EXPORT_SYMBOL(drm_helper_force_disable_all);
1/*
2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
4 *
5 * DRM core CRTC related functions
6 *
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.
16 *
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.
24 *
25 * Authors:
26 * Keith Packard
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
30 */
31
32#include <linux/export.h>
33#include <linux/moduleparam.h>
34
35#include "drmP.h"
36#include "drm_crtc.h"
37#include "drm_fourcc.h"
38#include "drm_crtc_helper.h"
39#include "drm_fb_helper.h"
40#include "drm_edid.h"
41
42static bool drm_kms_helper_poll = true;
43module_param_named(poll, drm_kms_helper_poll, bool, 0600);
44
45static void drm_mode_validate_flag(struct drm_connector *connector,
46 int flags)
47{
48 struct drm_display_mode *mode;
49
50 if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE))
51 return;
52
53 list_for_each_entry(mode, &connector->modes, head) {
54 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
55 !(flags & DRM_MODE_FLAG_INTERLACE))
56 mode->status = MODE_NO_INTERLACE;
57 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
58 !(flags & DRM_MODE_FLAG_DBLSCAN))
59 mode->status = MODE_NO_DBLESCAN;
60 }
61
62 return;
63}
64
65/**
66 * drm_helper_probe_single_connector_modes - get complete set of display modes
67 * @dev: DRM device
68 * @maxX: max width for modes
69 * @maxY: max height for modes
70 *
71 * LOCKING:
72 * Caller must hold mode config lock.
73 *
74 * Based on @dev's mode_config layout, scan all the connectors and try to detect
75 * modes on them. Modes will first be added to the connector's probed_modes
76 * list, then culled (based on validity and the @maxX, @maxY parameters) and
77 * put into the normal modes list.
78 *
79 * Intended to be used either at bootup time or when major configuration
80 * changes have occurred.
81 *
82 * FIXME: take into account monitor limits
83 *
84 * RETURNS:
85 * Number of modes found on @connector.
86 */
87int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
88 uint32_t maxX, uint32_t maxY)
89{
90 struct drm_device *dev = connector->dev;
91 struct drm_display_mode *mode;
92 struct drm_connector_helper_funcs *connector_funcs =
93 connector->helper_private;
94 int count = 0;
95 int mode_flags = 0;
96
97 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
98 drm_get_connector_name(connector));
99 /* set all modes to the unverified state */
100 list_for_each_entry(mode, &connector->modes, head)
101 mode->status = MODE_UNVERIFIED;
102
103 if (connector->force) {
104 if (connector->force == DRM_FORCE_ON)
105 connector->status = connector_status_connected;
106 else
107 connector->status = connector_status_disconnected;
108 if (connector->funcs->force)
109 connector->funcs->force(connector);
110 } else {
111 connector->status = connector->funcs->detect(connector, true);
112 drm_kms_helper_poll_enable(dev);
113 }
114
115 if (connector->status == connector_status_disconnected) {
116 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
117 connector->base.id, drm_get_connector_name(connector));
118 drm_mode_connector_update_edid_property(connector, NULL);
119 goto prune;
120 }
121
122#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
123 count = drm_load_edid_firmware(connector);
124 if (count == 0)
125#endif
126 count = (*connector_funcs->get_modes)(connector);
127
128 if (count == 0 && connector->status == connector_status_connected)
129 count = drm_add_modes_noedid(connector, 1024, 768);
130 if (count == 0)
131 goto prune;
132
133 drm_mode_connector_list_update(connector);
134
135 if (maxX && maxY)
136 drm_mode_validate_size(dev, &connector->modes, maxX,
137 maxY, 0);
138
139 if (connector->interlace_allowed)
140 mode_flags |= DRM_MODE_FLAG_INTERLACE;
141 if (connector->doublescan_allowed)
142 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
143 drm_mode_validate_flag(connector, mode_flags);
144
145 list_for_each_entry(mode, &connector->modes, head) {
146 if (mode->status == MODE_OK)
147 mode->status = connector_funcs->mode_valid(connector,
148 mode);
149 }
150
151prune:
152 drm_mode_prune_invalid(dev, &connector->modes, true);
153
154 if (list_empty(&connector->modes))
155 return 0;
156
157 drm_mode_sort(&connector->modes);
158
159 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
160 drm_get_connector_name(connector));
161 list_for_each_entry(mode, &connector->modes, head) {
162 mode->vrefresh = drm_mode_vrefresh(mode);
163
164 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
165 drm_mode_debug_printmodeline(mode);
166 }
167
168 return count;
169}
170EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
171
172/**
173 * drm_helper_encoder_in_use - check if a given encoder is in use
174 * @encoder: encoder to check
175 *
176 * LOCKING:
177 * Caller must hold mode config lock.
178 *
179 * Walk @encoders's DRM device's mode_config and see if it's in use.
180 *
181 * RETURNS:
182 * True if @encoder is part of the mode_config, false otherwise.
183 */
184bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
185{
186 struct drm_connector *connector;
187 struct drm_device *dev = encoder->dev;
188 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
189 if (connector->encoder == encoder)
190 return true;
191 return false;
192}
193EXPORT_SYMBOL(drm_helper_encoder_in_use);
194
195/**
196 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
197 * @crtc: CRTC to check
198 *
199 * LOCKING:
200 * Caller must hold mode config lock.
201 *
202 * Walk @crtc's DRM device's mode_config and see if it's in use.
203 *
204 * RETURNS:
205 * True if @crtc is part of the mode_config, false otherwise.
206 */
207bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
208{
209 struct drm_encoder *encoder;
210 struct drm_device *dev = crtc->dev;
211 /* FIXME: Locking around list access? */
212 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
213 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
214 return true;
215 return false;
216}
217EXPORT_SYMBOL(drm_helper_crtc_in_use);
218
219static void
220drm_encoder_disable(struct drm_encoder *encoder)
221{
222 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
223
224 if (encoder_funcs->disable)
225 (*encoder_funcs->disable)(encoder);
226 else
227 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
228}
229
230/**
231 * drm_helper_disable_unused_functions - disable unused objects
232 * @dev: DRM device
233 *
234 * LOCKING:
235 * Caller must hold mode config lock.
236 *
237 * If an connector or CRTC isn't part of @dev's mode_config, it can be disabled
238 * by calling its dpms function, which should power it off.
239 */
240void drm_helper_disable_unused_functions(struct drm_device *dev)
241{
242 struct drm_encoder *encoder;
243 struct drm_connector *connector;
244 struct drm_crtc *crtc;
245
246 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
247 if (!connector->encoder)
248 continue;
249 if (connector->status == connector_status_disconnected)
250 connector->encoder = NULL;
251 }
252
253 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
254 if (!drm_helper_encoder_in_use(encoder)) {
255 drm_encoder_disable(encoder);
256 /* disconnector encoder from any connector */
257 encoder->crtc = NULL;
258 }
259 }
260
261 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
262 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
263 crtc->enabled = drm_helper_crtc_in_use(crtc);
264 if (!crtc->enabled) {
265 if (crtc_funcs->disable)
266 (*crtc_funcs->disable)(crtc);
267 else
268 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
269 crtc->fb = NULL;
270 }
271 }
272}
273EXPORT_SYMBOL(drm_helper_disable_unused_functions);
274
275/**
276 * drm_encoder_crtc_ok - can a given crtc drive a given encoder?
277 * @encoder: encoder to test
278 * @crtc: crtc to test
279 *
280 * Return false if @encoder can't be driven by @crtc, true otherwise.
281 */
282static bool drm_encoder_crtc_ok(struct drm_encoder *encoder,
283 struct drm_crtc *crtc)
284{
285 struct drm_device *dev;
286 struct drm_crtc *tmp;
287 int crtc_mask = 1;
288
289 WARN(!crtc, "checking null crtc?\n");
290
291 dev = crtc->dev;
292
293 list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
294 if (tmp == crtc)
295 break;
296 crtc_mask <<= 1;
297 }
298
299 if (encoder->possible_crtcs & crtc_mask)
300 return true;
301 return false;
302}
303
304/*
305 * Check the CRTC we're going to map each output to vs. its current
306 * CRTC. If they don't match, we have to disable the output and the CRTC
307 * since the driver will have to re-route things.
308 */
309static void
310drm_crtc_prepare_encoders(struct drm_device *dev)
311{
312 struct drm_encoder_helper_funcs *encoder_funcs;
313 struct drm_encoder *encoder;
314
315 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
316 encoder_funcs = encoder->helper_private;
317 /* Disable unused encoders */
318 if (encoder->crtc == NULL)
319 drm_encoder_disable(encoder);
320 /* Disable encoders whose CRTC is about to change */
321 if (encoder_funcs->get_crtc &&
322 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
323 drm_encoder_disable(encoder);
324 }
325}
326
327/**
328 * drm_crtc_set_mode - set a mode
329 * @crtc: CRTC to program
330 * @mode: mode to use
331 * @x: width of mode
332 * @y: height of mode
333 *
334 * LOCKING:
335 * Caller must hold mode config lock.
336 *
337 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
338 * to fixup or reject the mode prior to trying to set it.
339 *
340 * RETURNS:
341 * True if the mode was set successfully, or false otherwise.
342 */
343bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
344 struct drm_display_mode *mode,
345 int x, int y,
346 struct drm_framebuffer *old_fb)
347{
348 struct drm_device *dev = crtc->dev;
349 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
350 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
351 struct drm_encoder_helper_funcs *encoder_funcs;
352 int saved_x, saved_y;
353 struct drm_encoder *encoder;
354 bool ret = true;
355
356 crtc->enabled = drm_helper_crtc_in_use(crtc);
357 if (!crtc->enabled)
358 return true;
359
360 adjusted_mode = drm_mode_duplicate(dev, mode);
361 if (!adjusted_mode)
362 return false;
363
364 saved_hwmode = crtc->hwmode;
365 saved_mode = crtc->mode;
366 saved_x = crtc->x;
367 saved_y = crtc->y;
368
369 /* Update crtc values up front so the driver can rely on them for mode
370 * setting.
371 */
372 crtc->mode = *mode;
373 crtc->x = x;
374 crtc->y = y;
375
376 /* Pass our mode to the connectors and the CRTC to give them a chance to
377 * adjust it according to limitations or connector properties, and also
378 * a chance to reject the mode entirely.
379 */
380 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
381
382 if (encoder->crtc != crtc)
383 continue;
384 encoder_funcs = encoder->helper_private;
385 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
386 adjusted_mode))) {
387 DRM_DEBUG_KMS("Encoder fixup failed\n");
388 goto done;
389 }
390 }
391
392 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
393 DRM_DEBUG_KMS("CRTC fixup failed\n");
394 goto done;
395 }
396 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
397
398 /* Prepare the encoders and CRTCs before setting the mode. */
399 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
400
401 if (encoder->crtc != crtc)
402 continue;
403 encoder_funcs = encoder->helper_private;
404 /* Disable the encoders as the first thing we do. */
405 encoder_funcs->prepare(encoder);
406 }
407
408 drm_crtc_prepare_encoders(dev);
409
410 crtc_funcs->prepare(crtc);
411
412 /* Set up the DPLL and any encoders state that needs to adjust or depend
413 * on the DPLL.
414 */
415 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
416 if (!ret)
417 goto done;
418
419 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
420
421 if (encoder->crtc != crtc)
422 continue;
423
424 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
425 encoder->base.id, drm_get_encoder_name(encoder),
426 mode->base.id, mode->name);
427 encoder_funcs = encoder->helper_private;
428 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
429 }
430
431 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
432 crtc_funcs->commit(crtc);
433
434 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
435
436 if (encoder->crtc != crtc)
437 continue;
438
439 encoder_funcs = encoder->helper_private;
440 encoder_funcs->commit(encoder);
441
442 }
443
444 /* Store real post-adjustment hardware mode. */
445 crtc->hwmode = *adjusted_mode;
446
447 /* Calculate and store various constants which
448 * are later needed by vblank and swap-completion
449 * timestamping. They are derived from true hwmode.
450 */
451 drm_calc_timestamping_constants(crtc);
452
453 /* FIXME: add subpixel order */
454done:
455 drm_mode_destroy(dev, adjusted_mode);
456 if (!ret) {
457 crtc->hwmode = saved_hwmode;
458 crtc->mode = saved_mode;
459 crtc->x = saved_x;
460 crtc->y = saved_y;
461 }
462
463 return ret;
464}
465EXPORT_SYMBOL(drm_crtc_helper_set_mode);
466
467
468static int
469drm_crtc_helper_disable(struct drm_crtc *crtc)
470{
471 struct drm_device *dev = crtc->dev;
472 struct drm_connector *connector;
473 struct drm_encoder *encoder;
474
475 /* Decouple all encoders and their attached connectors from this crtc */
476 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
477 if (encoder->crtc != crtc)
478 continue;
479
480 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
481 if (connector->encoder != encoder)
482 continue;
483
484 connector->encoder = NULL;
485 }
486 }
487
488 drm_helper_disable_unused_functions(dev);
489 return 0;
490}
491
492/**
493 * drm_crtc_helper_set_config - set a new config from userspace
494 * @crtc: CRTC to setup
495 * @crtc_info: user provided configuration
496 * @new_mode: new mode to set
497 * @connector_set: set of connectors for the new config
498 * @fb: new framebuffer
499 *
500 * LOCKING:
501 * Caller must hold mode config lock.
502 *
503 * Setup a new configuration, provided by the user in @crtc_info, and enable
504 * it.
505 *
506 * RETURNS:
507 * Zero. (FIXME)
508 */
509int drm_crtc_helper_set_config(struct drm_mode_set *set)
510{
511 struct drm_device *dev;
512 struct drm_crtc *save_crtcs, *new_crtc, *crtc;
513 struct drm_encoder *save_encoders, *new_encoder, *encoder;
514 struct drm_framebuffer *old_fb = NULL;
515 bool mode_changed = false; /* if true do a full mode set */
516 bool fb_changed = false; /* if true and !mode_changed just do a flip */
517 struct drm_connector *save_connectors, *connector;
518 int count = 0, ro, fail = 0;
519 struct drm_crtc_helper_funcs *crtc_funcs;
520 struct drm_mode_set save_set;
521 int ret;
522 int i;
523
524 DRM_DEBUG_KMS("\n");
525
526 if (!set)
527 return -EINVAL;
528
529 if (!set->crtc)
530 return -EINVAL;
531
532 if (!set->crtc->helper_private)
533 return -EINVAL;
534
535 crtc_funcs = set->crtc->helper_private;
536
537 if (!set->mode)
538 set->fb = NULL;
539
540 if (set->fb) {
541 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
542 set->crtc->base.id, set->fb->base.id,
543 (int)set->num_connectors, set->x, set->y);
544 } else {
545 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
546 return drm_crtc_helper_disable(set->crtc);
547 }
548
549 dev = set->crtc->dev;
550
551 /* Allocate space for the backup of all (non-pointer) crtc, encoder and
552 * connector data. */
553 save_crtcs = kzalloc(dev->mode_config.num_crtc *
554 sizeof(struct drm_crtc), GFP_KERNEL);
555 if (!save_crtcs)
556 return -ENOMEM;
557
558 save_encoders = kzalloc(dev->mode_config.num_encoder *
559 sizeof(struct drm_encoder), GFP_KERNEL);
560 if (!save_encoders) {
561 kfree(save_crtcs);
562 return -ENOMEM;
563 }
564
565 save_connectors = kzalloc(dev->mode_config.num_connector *
566 sizeof(struct drm_connector), GFP_KERNEL);
567 if (!save_connectors) {
568 kfree(save_crtcs);
569 kfree(save_encoders);
570 return -ENOMEM;
571 }
572
573 /* Copy data. Note that driver private data is not affected.
574 * Should anything bad happen only the expected state is
575 * restored, not the drivers personal bookkeeping.
576 */
577 count = 0;
578 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
579 save_crtcs[count++] = *crtc;
580 }
581
582 count = 0;
583 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
584 save_encoders[count++] = *encoder;
585 }
586
587 count = 0;
588 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
589 save_connectors[count++] = *connector;
590 }
591
592 save_set.crtc = set->crtc;
593 save_set.mode = &set->crtc->mode;
594 save_set.x = set->crtc->x;
595 save_set.y = set->crtc->y;
596 save_set.fb = set->crtc->fb;
597
598 /* We should be able to check here if the fb has the same properties
599 * and then just flip_or_move it */
600 if (set->crtc->fb != set->fb) {
601 /* If we have no fb then treat it as a full mode set */
602 if (set->crtc->fb == NULL) {
603 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
604 mode_changed = true;
605 } else if (set->fb == NULL) {
606 mode_changed = true;
607 } else if (set->fb->depth != set->crtc->fb->depth) {
608 mode_changed = true;
609 } else if (set->fb->bits_per_pixel !=
610 set->crtc->fb->bits_per_pixel) {
611 mode_changed = true;
612 } else
613 fb_changed = true;
614 }
615
616 if (set->x != set->crtc->x || set->y != set->crtc->y)
617 fb_changed = true;
618
619 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
620 DRM_DEBUG_KMS("modes are different, full mode set\n");
621 drm_mode_debug_printmodeline(&set->crtc->mode);
622 drm_mode_debug_printmodeline(set->mode);
623 mode_changed = true;
624 }
625
626 /* a) traverse passed in connector list and get encoders for them */
627 count = 0;
628 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
629 struct drm_connector_helper_funcs *connector_funcs =
630 connector->helper_private;
631 new_encoder = connector->encoder;
632 for (ro = 0; ro < set->num_connectors; ro++) {
633 if (set->connectors[ro] == connector) {
634 new_encoder = connector_funcs->best_encoder(connector);
635 /* if we can't get an encoder for a connector
636 we are setting now - then fail */
637 if (new_encoder == NULL)
638 /* don't break so fail path works correct */
639 fail = 1;
640 break;
641 }
642 }
643
644 if (new_encoder != connector->encoder) {
645 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
646 mode_changed = true;
647 /* If the encoder is reused for another connector, then
648 * the appropriate crtc will be set later.
649 */
650 if (connector->encoder)
651 connector->encoder->crtc = NULL;
652 connector->encoder = new_encoder;
653 }
654 }
655
656 if (fail) {
657 ret = -EINVAL;
658 goto fail;
659 }
660
661 count = 0;
662 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
663 if (!connector->encoder)
664 continue;
665
666 if (connector->encoder->crtc == set->crtc)
667 new_crtc = NULL;
668 else
669 new_crtc = connector->encoder->crtc;
670
671 for (ro = 0; ro < set->num_connectors; ro++) {
672 if (set->connectors[ro] == connector)
673 new_crtc = set->crtc;
674 }
675
676 /* Make sure the new CRTC will work with the encoder */
677 if (new_crtc &&
678 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
679 ret = -EINVAL;
680 goto fail;
681 }
682 if (new_crtc != connector->encoder->crtc) {
683 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
684 mode_changed = true;
685 connector->encoder->crtc = new_crtc;
686 }
687 if (new_crtc) {
688 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
689 connector->base.id, drm_get_connector_name(connector),
690 new_crtc->base.id);
691 } else {
692 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
693 connector->base.id, drm_get_connector_name(connector));
694 }
695 }
696
697 /* mode_set_base is not a required function */
698 if (fb_changed && !crtc_funcs->mode_set_base)
699 mode_changed = true;
700
701 if (mode_changed) {
702 set->crtc->enabled = drm_helper_crtc_in_use(set->crtc);
703 if (set->crtc->enabled) {
704 DRM_DEBUG_KMS("attempting to set mode from"
705 " userspace\n");
706 drm_mode_debug_printmodeline(set->mode);
707 old_fb = set->crtc->fb;
708 set->crtc->fb = set->fb;
709 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
710 set->x, set->y,
711 old_fb)) {
712 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
713 set->crtc->base.id);
714 set->crtc->fb = old_fb;
715 ret = -EINVAL;
716 goto fail;
717 }
718 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
719 for (i = 0; i < set->num_connectors; i++) {
720 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
721 drm_get_connector_name(set->connectors[i]));
722 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
723 }
724 }
725 drm_helper_disable_unused_functions(dev);
726 } else if (fb_changed) {
727 set->crtc->x = set->x;
728 set->crtc->y = set->y;
729
730 old_fb = set->crtc->fb;
731 if (set->crtc->fb != set->fb)
732 set->crtc->fb = set->fb;
733 ret = crtc_funcs->mode_set_base(set->crtc,
734 set->x, set->y, old_fb);
735 if (ret != 0) {
736 set->crtc->fb = old_fb;
737 goto fail;
738 }
739 }
740
741 kfree(save_connectors);
742 kfree(save_encoders);
743 kfree(save_crtcs);
744 return 0;
745
746fail:
747 /* Restore all previous data. */
748 count = 0;
749 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
750 *crtc = save_crtcs[count++];
751 }
752
753 count = 0;
754 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
755 *encoder = save_encoders[count++];
756 }
757
758 count = 0;
759 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
760 *connector = save_connectors[count++];
761 }
762
763 /* Try to restore the config */
764 if (mode_changed &&
765 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
766 save_set.y, save_set.fb))
767 DRM_ERROR("failed to restore config after modeset failure\n");
768
769 kfree(save_connectors);
770 kfree(save_encoders);
771 kfree(save_crtcs);
772 return ret;
773}
774EXPORT_SYMBOL(drm_crtc_helper_set_config);
775
776static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
777{
778 int dpms = DRM_MODE_DPMS_OFF;
779 struct drm_connector *connector;
780 struct drm_device *dev = encoder->dev;
781
782 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
783 if (connector->encoder == encoder)
784 if (connector->dpms < dpms)
785 dpms = connector->dpms;
786 return dpms;
787}
788
789static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
790{
791 int dpms = DRM_MODE_DPMS_OFF;
792 struct drm_connector *connector;
793 struct drm_device *dev = crtc->dev;
794
795 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
796 if (connector->encoder && connector->encoder->crtc == crtc)
797 if (connector->dpms < dpms)
798 dpms = connector->dpms;
799 return dpms;
800}
801
802/**
803 * drm_helper_connector_dpms
804 * @connector affected connector
805 * @mode DPMS mode
806 *
807 * Calls the low-level connector DPMS function, then
808 * calls appropriate encoder and crtc DPMS functions as well
809 */
810void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
811{
812 struct drm_encoder *encoder = connector->encoder;
813 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
814 int old_dpms;
815
816 if (mode == connector->dpms)
817 return;
818
819 old_dpms = connector->dpms;
820 connector->dpms = mode;
821
822 /* from off to on, do crtc then encoder */
823 if (mode < old_dpms) {
824 if (crtc) {
825 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
826 if (crtc_funcs->dpms)
827 (*crtc_funcs->dpms) (crtc,
828 drm_helper_choose_crtc_dpms(crtc));
829 }
830 if (encoder) {
831 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
832 if (encoder_funcs->dpms)
833 (*encoder_funcs->dpms) (encoder,
834 drm_helper_choose_encoder_dpms(encoder));
835 }
836 }
837
838 /* from on to off, do encoder then crtc */
839 if (mode > old_dpms) {
840 if (encoder) {
841 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
842 if (encoder_funcs->dpms)
843 (*encoder_funcs->dpms) (encoder,
844 drm_helper_choose_encoder_dpms(encoder));
845 }
846 if (crtc) {
847 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
848 if (crtc_funcs->dpms)
849 (*crtc_funcs->dpms) (crtc,
850 drm_helper_choose_crtc_dpms(crtc));
851 }
852 }
853
854 return;
855}
856EXPORT_SYMBOL(drm_helper_connector_dpms);
857
858int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
859 struct drm_mode_fb_cmd2 *mode_cmd)
860{
861 int i;
862
863 fb->width = mode_cmd->width;
864 fb->height = mode_cmd->height;
865 for (i = 0; i < 4; i++) {
866 fb->pitches[i] = mode_cmd->pitches[i];
867 fb->offsets[i] = mode_cmd->offsets[i];
868 }
869 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
870 &fb->bits_per_pixel);
871 fb->pixel_format = mode_cmd->pixel_format;
872
873 return 0;
874}
875EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
876
877int drm_helper_resume_force_mode(struct drm_device *dev)
878{
879 struct drm_crtc *crtc;
880 struct drm_encoder *encoder;
881 struct drm_encoder_helper_funcs *encoder_funcs;
882 struct drm_crtc_helper_funcs *crtc_funcs;
883 int ret;
884
885 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
886
887 if (!crtc->enabled)
888 continue;
889
890 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
891 crtc->x, crtc->y, crtc->fb);
892
893 if (ret == false)
894 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
895
896 /* Turn off outputs that were already powered off */
897 if (drm_helper_choose_crtc_dpms(crtc)) {
898 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
899
900 if(encoder->crtc != crtc)
901 continue;
902
903 encoder_funcs = encoder->helper_private;
904 if (encoder_funcs->dpms)
905 (*encoder_funcs->dpms) (encoder,
906 drm_helper_choose_encoder_dpms(encoder));
907 }
908
909 crtc_funcs = crtc->helper_private;
910 if (crtc_funcs->dpms)
911 (*crtc_funcs->dpms) (crtc,
912 drm_helper_choose_crtc_dpms(crtc));
913 }
914 }
915 /* disable the unused connectors while restoring the modesetting */
916 drm_helper_disable_unused_functions(dev);
917 return 0;
918}
919EXPORT_SYMBOL(drm_helper_resume_force_mode);
920
921#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
922static void output_poll_execute(struct work_struct *work)
923{
924 struct delayed_work *delayed_work = to_delayed_work(work);
925 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
926 struct drm_connector *connector;
927 enum drm_connector_status old_status;
928 bool repoll = false, changed = false;
929
930 if (!drm_kms_helper_poll)
931 return;
932
933 mutex_lock(&dev->mode_config.mutex);
934 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
935
936 /* if this is HPD or polled don't check it -
937 TV out for instance */
938 if (!connector->polled)
939 continue;
940
941 else if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT))
942 repoll = true;
943
944 old_status = connector->status;
945 /* if we are connected and don't want to poll for disconnect
946 skip it */
947 if (old_status == connector_status_connected &&
948 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT) &&
949 !(connector->polled & DRM_CONNECTOR_POLL_HPD))
950 continue;
951
952 connector->status = connector->funcs->detect(connector, false);
953 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
954 connector->base.id,
955 drm_get_connector_name(connector),
956 old_status, connector->status);
957 if (old_status != connector->status)
958 changed = true;
959 }
960
961 mutex_unlock(&dev->mode_config.mutex);
962
963 if (changed) {
964 /* send a uevent + call fbdev */
965 drm_sysfs_hotplug_event(dev);
966 if (dev->mode_config.funcs->output_poll_changed)
967 dev->mode_config.funcs->output_poll_changed(dev);
968 }
969
970 if (repoll)
971 queue_delayed_work(system_nrt_wq, delayed_work, DRM_OUTPUT_POLL_PERIOD);
972}
973
974void drm_kms_helper_poll_disable(struct drm_device *dev)
975{
976 if (!dev->mode_config.poll_enabled)
977 return;
978 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
979}
980EXPORT_SYMBOL(drm_kms_helper_poll_disable);
981
982void drm_kms_helper_poll_enable(struct drm_device *dev)
983{
984 bool poll = false;
985 struct drm_connector *connector;
986
987 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
988 return;
989
990 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
991 if (connector->polled)
992 poll = true;
993 }
994
995 if (poll)
996 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
997}
998EXPORT_SYMBOL(drm_kms_helper_poll_enable);
999
1000void drm_kms_helper_poll_init(struct drm_device *dev)
1001{
1002 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1003 dev->mode_config.poll_enabled = true;
1004
1005 drm_kms_helper_poll_enable(dev);
1006}
1007EXPORT_SYMBOL(drm_kms_helper_poll_init);
1008
1009void drm_kms_helper_poll_fini(struct drm_device *dev)
1010{
1011 drm_kms_helper_poll_disable(dev);
1012}
1013EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1014
1015void drm_helper_hpd_irq_event(struct drm_device *dev)
1016{
1017 if (!dev->mode_config.poll_enabled)
1018 return;
1019
1020 /* kill timer and schedule immediate execution, this doesn't block */
1021 cancel_delayed_work(&dev->mode_config.output_poll_work);
1022 if (drm_kms_helper_poll)
1023 queue_delayed_work(system_nrt_wq, &dev->mode_config.output_poll_work, 0);
1024}
1025EXPORT_SYMBOL(drm_helper_hpd_irq_event);