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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#include <linux/dynamic_debug.h>
36
37#include <drm/drm_atomic.h>
38#include <drm/drm_atomic_helper.h>
39#include <drm/drm_atomic_uapi.h>
40#include <drm/drm_bridge.h>
41#include <drm/drm_crtc.h>
42#include <drm/drm_crtc_helper.h>
43#include <drm/drm_drv.h>
44#include <drm/drm_edid.h>
45#include <drm/drm_encoder.h>
46#include <drm/drm_fourcc.h>
47#include <drm/drm_framebuffer.h>
48#include <drm/drm_print.h>
49#include <drm/drm_vblank.h>
50
51#include "drm_crtc_helper_internal.h"
52
53DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
54 "DRM_UT_CORE",
55 "DRM_UT_DRIVER",
56 "DRM_UT_KMS",
57 "DRM_UT_PRIME",
58 "DRM_UT_ATOMIC",
59 "DRM_UT_VBL",
60 "DRM_UT_STATE",
61 "DRM_UT_LEASE",
62 "DRM_UT_DP",
63 "DRM_UT_DRMRES");
64
65/**
66 * DOC: overview
67 *
68 * The CRTC modeset helper library provides a default set_config implementation
69 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
70 * the same callbacks which drivers can use to e.g. restore the modeset
71 * configuration on resume with drm_helper_resume_force_mode().
72 *
73 * Note that this helper library doesn't track the current power state of CRTCs
74 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even
75 * though the hardware is already in the desired state. This deficiency has been
76 * fixed in the atomic helpers.
77 *
78 * The driver callbacks are mostly compatible with the atomic modeset helpers,
79 * except for the handling of the primary plane: Atomic helpers require that the
80 * primary plane is implemented as a real standalone plane and not directly tied
81 * to the CRTC state. For easier transition this library provides functions to
82 * implement the old semantics required by the CRTC helpers using the new plane
83 * and atomic helper callbacks.
84 *
85 * Drivers are strongly urged to convert to the atomic helpers (by way of first
86 * converting to the plane helpers). New drivers must not use these functions
87 * but need to implement the atomic interface instead, potentially using the
88 * atomic helpers for that.
89 *
90 * These legacy modeset helpers use the same function table structures as
91 * all other modesetting helpers. See the documentation for struct
92 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct
93 * &drm_connector_helper_funcs.
94 */
95
96/**
97 * drm_helper_encoder_in_use - check if a given encoder is in use
98 * @encoder: encoder to check
99 *
100 * Checks whether @encoder is with the current mode setting output configuration
101 * in use by any connector. This doesn't mean that it is actually enabled since
102 * the DPMS state is tracked separately.
103 *
104 * Returns:
105 * True if @encoder is used, false otherwise.
106 */
107bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
108{
109 struct drm_connector *connector;
110 struct drm_connector_list_iter conn_iter;
111 struct drm_device *dev = encoder->dev;
112
113 WARN_ON(drm_drv_uses_atomic_modeset(dev));
114
115 /*
116 * We can expect this mutex to be locked if we are not panicking.
117 * Locking is currently fubar in the panic handler.
118 */
119 if (!oops_in_progress) {
120 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
121 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
122 }
123
124
125 drm_connector_list_iter_begin(dev, &conn_iter);
126 drm_for_each_connector_iter(connector, &conn_iter) {
127 if (connector->encoder == encoder) {
128 drm_connector_list_iter_end(&conn_iter);
129 return true;
130 }
131 }
132 drm_connector_list_iter_end(&conn_iter);
133 return false;
134}
135EXPORT_SYMBOL(drm_helper_encoder_in_use);
136
137/**
138 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
139 * @crtc: CRTC to check
140 *
141 * Checks whether @crtc is with the current mode setting output configuration
142 * in use by any connector. This doesn't mean that it is actually enabled since
143 * the DPMS state is tracked separately.
144 *
145 * Returns:
146 * True if @crtc is used, false otherwise.
147 */
148bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
149{
150 struct drm_encoder *encoder;
151 struct drm_device *dev = crtc->dev;
152
153 WARN_ON(drm_drv_uses_atomic_modeset(dev));
154
155 /*
156 * We can expect this mutex to be locked if we are not panicking.
157 * Locking is currently fubar in the panic handler.
158 */
159 if (!oops_in_progress)
160 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
161
162 drm_for_each_encoder(encoder, dev)
163 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
164 return true;
165 return false;
166}
167EXPORT_SYMBOL(drm_helper_crtc_in_use);
168
169static void
170drm_encoder_disable(struct drm_encoder *encoder)
171{
172 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
173
174 if (!encoder_funcs)
175 return;
176
177 if (encoder_funcs->disable)
178 (*encoder_funcs->disable)(encoder);
179 else if (encoder_funcs->dpms)
180 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
181}
182
183static void __drm_helper_disable_unused_functions(struct drm_device *dev)
184{
185 struct drm_encoder *encoder;
186 struct drm_crtc *crtc;
187
188 drm_warn_on_modeset_not_all_locked(dev);
189
190 drm_for_each_encoder(encoder, dev) {
191 if (!drm_helper_encoder_in_use(encoder)) {
192 drm_encoder_disable(encoder);
193 /* disconnect encoder from any connector */
194 encoder->crtc = NULL;
195 }
196 }
197
198 drm_for_each_crtc(crtc, dev) {
199 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
200
201 crtc->enabled = drm_helper_crtc_in_use(crtc);
202 if (!crtc->enabled) {
203 if (crtc_funcs->disable)
204 (*crtc_funcs->disable)(crtc);
205 else
206 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
207 crtc->primary->fb = NULL;
208 }
209 }
210}
211
212/**
213 * drm_helper_disable_unused_functions - disable unused objects
214 * @dev: DRM device
215 *
216 * This function walks through the entire mode setting configuration of @dev. It
217 * will remove any CRTC links of unused encoders and encoder links of
218 * disconnected connectors. Then it will disable all unused encoders and CRTCs
219 * either by calling their disable callback if available or by calling their
220 * dpms callback with DRM_MODE_DPMS_OFF.
221 *
222 * NOTE:
223 *
224 * This function is part of the legacy modeset helper library and will cause
225 * major confusion with atomic drivers. This is because atomic helpers guarantee
226 * to never call ->disable() hooks on a disabled function, or ->enable() hooks
227 * on an enabled functions. drm_helper_disable_unused_functions() on the other
228 * hand throws such guarantees into the wind and calls disable hooks
229 * unconditionally on unused functions.
230 */
231void drm_helper_disable_unused_functions(struct drm_device *dev)
232{
233 WARN_ON(drm_drv_uses_atomic_modeset(dev));
234
235 drm_modeset_lock_all(dev);
236 __drm_helper_disable_unused_functions(dev);
237 drm_modeset_unlock_all(dev);
238}
239EXPORT_SYMBOL(drm_helper_disable_unused_functions);
240
241/*
242 * Check the CRTC we're going to map each output to vs. its current
243 * CRTC. If they don't match, we have to disable the output and the CRTC
244 * since the driver will have to re-route things.
245 */
246static void
247drm_crtc_prepare_encoders(struct drm_device *dev)
248{
249 const struct drm_encoder_helper_funcs *encoder_funcs;
250 struct drm_encoder *encoder;
251
252 drm_for_each_encoder(encoder, dev) {
253 encoder_funcs = encoder->helper_private;
254 if (!encoder_funcs)
255 continue;
256
257 /* Disable unused encoders */
258 if (encoder->crtc == NULL)
259 drm_encoder_disable(encoder);
260 }
261}
262
263/**
264 * drm_crtc_helper_set_mode - internal helper to set a mode
265 * @crtc: CRTC to program
266 * @mode: mode to use
267 * @x: horizontal offset into the surface
268 * @y: vertical offset into the surface
269 * @old_fb: old framebuffer, for cleanup
270 *
271 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
272 * to fixup or reject the mode prior to trying to set it. This is an internal
273 * helper that drivers could e.g. use to update properties that require the
274 * entire output pipe to be disabled and re-enabled in a new configuration. For
275 * example for changing whether audio is enabled on a hdmi link or for changing
276 * panel fitter or dither attributes. It is also called by the
277 * drm_crtc_helper_set_config() helper function to drive the mode setting
278 * sequence.
279 *
280 * Returns:
281 * True if the mode was set successfully, false otherwise.
282 */
283bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
284 struct drm_display_mode *mode,
285 int x, int y,
286 struct drm_framebuffer *old_fb)
287{
288 struct drm_device *dev = crtc->dev;
289 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
290 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
291 const struct drm_encoder_helper_funcs *encoder_funcs;
292 int saved_x, saved_y;
293 bool saved_enabled;
294 struct drm_encoder *encoder;
295 bool ret = true;
296
297 WARN_ON(drm_drv_uses_atomic_modeset(dev));
298
299 drm_warn_on_modeset_not_all_locked(dev);
300
301 saved_enabled = crtc->enabled;
302 crtc->enabled = drm_helper_crtc_in_use(crtc);
303 if (!crtc->enabled)
304 return true;
305
306 adjusted_mode = drm_mode_duplicate(dev, mode);
307 if (!adjusted_mode) {
308 crtc->enabled = saved_enabled;
309 return false;
310 }
311
312 drm_mode_init(&saved_mode, &crtc->mode);
313 drm_mode_init(&saved_hwmode, &crtc->hwmode);
314 saved_x = crtc->x;
315 saved_y = crtc->y;
316
317 /* Update crtc values up front so the driver can rely on them for mode
318 * setting.
319 */
320 drm_mode_copy(&crtc->mode, mode);
321 crtc->x = x;
322 crtc->y = y;
323
324 /* Pass our mode to the connectors and the CRTC to give them a chance to
325 * adjust it according to limitations or connector properties, and also
326 * a chance to reject the mode entirely.
327 */
328 drm_for_each_encoder(encoder, dev) {
329
330 if (encoder->crtc != crtc)
331 continue;
332
333 encoder_funcs = encoder->helper_private;
334 if (!encoder_funcs)
335 continue;
336
337 encoder_funcs = encoder->helper_private;
338 if (encoder_funcs->mode_fixup) {
339 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
340 adjusted_mode))) {
341 DRM_DEBUG_KMS("Encoder fixup failed\n");
342 goto done;
343 }
344 }
345 }
346
347 if (crtc_funcs->mode_fixup) {
348 if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
349 adjusted_mode))) {
350 DRM_DEBUG_KMS("CRTC fixup failed\n");
351 goto done;
352 }
353 }
354 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
355
356 drm_mode_copy(&crtc->hwmode, adjusted_mode);
357
358 /* Prepare the encoders and CRTCs before setting the mode. */
359 drm_for_each_encoder(encoder, dev) {
360
361 if (encoder->crtc != crtc)
362 continue;
363
364 encoder_funcs = encoder->helper_private;
365 if (!encoder_funcs)
366 continue;
367
368 /* Disable the encoders as the first thing we do. */
369 if (encoder_funcs->prepare)
370 encoder_funcs->prepare(encoder);
371 }
372
373 drm_crtc_prepare_encoders(dev);
374
375 crtc_funcs->prepare(crtc);
376
377 /* Set up the DPLL and any encoders state that needs to adjust or depend
378 * on the DPLL.
379 */
380 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
381 if (!ret)
382 goto done;
383
384 drm_for_each_encoder(encoder, dev) {
385
386 if (encoder->crtc != crtc)
387 continue;
388
389 encoder_funcs = encoder->helper_private;
390 if (!encoder_funcs)
391 continue;
392
393 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%s]\n",
394 encoder->base.id, encoder->name, mode->name);
395 if (encoder_funcs->mode_set)
396 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
397 }
398
399 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
400 crtc_funcs->commit(crtc);
401
402 drm_for_each_encoder(encoder, dev) {
403
404 if (encoder->crtc != crtc)
405 continue;
406
407 encoder_funcs = encoder->helper_private;
408 if (!encoder_funcs)
409 continue;
410
411 if (encoder_funcs->commit)
412 encoder_funcs->commit(encoder);
413 }
414
415 /* Calculate and store various constants which
416 * are later needed by vblank and swap-completion
417 * timestamping. They are derived from true hwmode.
418 */
419 drm_calc_timestamping_constants(crtc, &crtc->hwmode);
420
421 /* FIXME: add subpixel order */
422done:
423 drm_mode_destroy(dev, adjusted_mode);
424 if (!ret) {
425 crtc->enabled = saved_enabled;
426 drm_mode_copy(&crtc->mode, &saved_mode);
427 drm_mode_copy(&crtc->hwmode, &saved_hwmode);
428 crtc->x = saved_x;
429 crtc->y = saved_y;
430 }
431
432 return ret;
433}
434EXPORT_SYMBOL(drm_crtc_helper_set_mode);
435
436/**
437 * drm_crtc_helper_atomic_check() - Helper to check CRTC atomic-state
438 * @crtc: CRTC to check
439 * @state: atomic state object
440 *
441 * Provides a default CRTC-state check handler for CRTCs that only have
442 * one primary plane attached to it. This is often the case for the CRTC
443 * of simple framebuffers.
444 *
445 * RETURNS:
446 * Zero on success, or an errno code otherwise.
447 */
448int drm_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)
449{
450 struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
451
452 if (!new_crtc_state->enable)
453 return 0;
454
455 return drm_atomic_helper_check_crtc_primary_plane(new_crtc_state);
456}
457EXPORT_SYMBOL(drm_crtc_helper_atomic_check);
458
459static void
460drm_crtc_helper_disable(struct drm_crtc *crtc)
461{
462 struct drm_device *dev = crtc->dev;
463 struct drm_connector *connector;
464 struct drm_encoder *encoder;
465
466 /* Decouple all encoders and their attached connectors from this crtc */
467 drm_for_each_encoder(encoder, dev) {
468 struct drm_connector_list_iter conn_iter;
469
470 if (encoder->crtc != crtc)
471 continue;
472
473 drm_connector_list_iter_begin(dev, &conn_iter);
474 drm_for_each_connector_iter(connector, &conn_iter) {
475 if (connector->encoder != encoder)
476 continue;
477
478 connector->encoder = NULL;
479
480 /*
481 * drm_helper_disable_unused_functions() ought to be
482 * doing this, but since we've decoupled the encoder
483 * from the connector above, the required connection
484 * between them is henceforth no longer available.
485 */
486 connector->dpms = DRM_MODE_DPMS_OFF;
487
488 /* we keep a reference while the encoder is bound */
489 drm_connector_put(connector);
490 }
491 drm_connector_list_iter_end(&conn_iter);
492 }
493
494 __drm_helper_disable_unused_functions(dev);
495}
496
497/*
498 * For connectors that support multiple encoders, either the
499 * .atomic_best_encoder() or .best_encoder() operation must be implemented.
500 */
501struct drm_encoder *
502drm_connector_get_single_encoder(struct drm_connector *connector)
503{
504 struct drm_encoder *encoder;
505
506 WARN_ON(hweight32(connector->possible_encoders) > 1);
507 drm_connector_for_each_possible_encoder(connector, encoder)
508 return encoder;
509
510 return NULL;
511}
512
513/**
514 * drm_crtc_helper_set_config - set a new config from userspace
515 * @set: mode set configuration
516 * @ctx: lock acquire context, not used here
517 *
518 * The drm_crtc_helper_set_config() helper function implements the of
519 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
520 * helpers.
521 *
522 * It first tries to locate the best encoder for each connector by calling the
523 * connector @drm_connector_helper_funcs.best_encoder helper operation.
524 *
525 * After locating the appropriate encoders, the helper function will call the
526 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
527 * or reject it completely in which case an error will be returned to the
528 * application. If the new configuration after mode adjustment is identical to
529 * the current configuration the helper function will return without performing
530 * any other operation.
531 *
532 * If the adjusted mode is identical to the current mode but changes to the
533 * frame buffer need to be applied, the drm_crtc_helper_set_config() function
534 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
535 *
536 * If the adjusted mode differs from the current mode, or if the
537 * ->mode_set_base() helper operation is not provided, the helper function
538 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
539 * and ->commit() CRTC and encoder helper operations, in that order.
540 * Alternatively it can also use the dpms and disable helper operations. For
541 * details see &struct drm_crtc_helper_funcs and struct
542 * &drm_encoder_helper_funcs.
543 *
544 * This function is deprecated. New drivers must implement atomic modeset
545 * support, for which this function is unsuitable. Instead drivers should use
546 * drm_atomic_helper_set_config().
547 *
548 * Returns:
549 * Returns 0 on success, negative errno numbers on failure.
550 */
551int drm_crtc_helper_set_config(struct drm_mode_set *set,
552 struct drm_modeset_acquire_ctx *ctx)
553{
554 struct drm_device *dev;
555 struct drm_crtc **save_encoder_crtcs, *new_crtc;
556 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
557 bool mode_changed = false; /* if true do a full mode set */
558 bool fb_changed = false; /* if true and !mode_changed just do a flip */
559 struct drm_connector *connector;
560 struct drm_connector_list_iter conn_iter;
561 int count = 0, ro, fail = 0;
562 const struct drm_crtc_helper_funcs *crtc_funcs;
563 struct drm_mode_set save_set;
564 int ret;
565 int i;
566
567 DRM_DEBUG_KMS("\n");
568
569 BUG_ON(!set);
570 BUG_ON(!set->crtc);
571 BUG_ON(!set->crtc->helper_private);
572
573 /* Enforce sane interface api - has been abused by the fb helper. */
574 BUG_ON(!set->mode && set->fb);
575 BUG_ON(set->fb && set->num_connectors == 0);
576
577 crtc_funcs = set->crtc->helper_private;
578
579 dev = set->crtc->dev;
580 WARN_ON(drm_drv_uses_atomic_modeset(dev));
581
582 if (!set->mode)
583 set->fb = NULL;
584
585 if (set->fb) {
586 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
587 set->crtc->base.id, set->crtc->name,
588 set->fb->base.id,
589 (int)set->num_connectors, set->x, set->y);
590 } else {
591 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
592 set->crtc->base.id, set->crtc->name);
593 drm_crtc_helper_disable(set->crtc);
594 return 0;
595 }
596
597 drm_warn_on_modeset_not_all_locked(dev);
598
599 /*
600 * Allocate space for the backup of all (non-pointer) encoder and
601 * connector data.
602 */
603 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder,
604 sizeof(struct drm_crtc *), GFP_KERNEL);
605 if (!save_encoder_crtcs)
606 return -ENOMEM;
607
608 save_connector_encoders = kcalloc(dev->mode_config.num_connector,
609 sizeof(struct drm_encoder *), GFP_KERNEL);
610 if (!save_connector_encoders) {
611 kfree(save_encoder_crtcs);
612 return -ENOMEM;
613 }
614
615 /*
616 * Copy data. Note that driver private data is not affected.
617 * Should anything bad happen only the expected state is
618 * restored, not the drivers personal bookkeeping.
619 */
620 count = 0;
621 drm_for_each_encoder(encoder, dev) {
622 save_encoder_crtcs[count++] = encoder->crtc;
623 }
624
625 count = 0;
626 drm_connector_list_iter_begin(dev, &conn_iter);
627 drm_for_each_connector_iter(connector, &conn_iter)
628 save_connector_encoders[count++] = connector->encoder;
629 drm_connector_list_iter_end(&conn_iter);
630
631 save_set.crtc = set->crtc;
632 save_set.mode = &set->crtc->mode;
633 save_set.x = set->crtc->x;
634 save_set.y = set->crtc->y;
635 save_set.fb = set->crtc->primary->fb;
636
637 /* We should be able to check here if the fb has the same properties
638 * and then just flip_or_move it */
639 if (set->crtc->primary->fb != set->fb) {
640 /* If we have no fb then treat it as a full mode set */
641 if (set->crtc->primary->fb == NULL) {
642 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
643 mode_changed = true;
644 } else if (set->fb->format != set->crtc->primary->fb->format) {
645 mode_changed = true;
646 } else
647 fb_changed = true;
648 }
649
650 if (set->x != set->crtc->x || set->y != set->crtc->y)
651 fb_changed = true;
652
653 if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
654 DRM_DEBUG_KMS("modes are different, full mode set\n");
655 drm_mode_debug_printmodeline(&set->crtc->mode);
656 drm_mode_debug_printmodeline(set->mode);
657 mode_changed = true;
658 }
659
660 /* take a reference on all unbound connectors in set, reuse the
661 * already taken reference for bound connectors
662 */
663 for (ro = 0; ro < set->num_connectors; ro++) {
664 if (set->connectors[ro]->encoder)
665 continue;
666 drm_connector_get(set->connectors[ro]);
667 }
668
669 /* a) traverse passed in connector list and get encoders for them */
670 count = 0;
671 drm_connector_list_iter_begin(dev, &conn_iter);
672 drm_for_each_connector_iter(connector, &conn_iter) {
673 const struct drm_connector_helper_funcs *connector_funcs =
674 connector->helper_private;
675 new_encoder = connector->encoder;
676 for (ro = 0; ro < set->num_connectors; ro++) {
677 if (set->connectors[ro] == connector) {
678 if (connector_funcs->best_encoder)
679 new_encoder = connector_funcs->best_encoder(connector);
680 else
681 new_encoder = drm_connector_get_single_encoder(connector);
682
683 /* if we can't get an encoder for a connector
684 we are setting now - then fail */
685 if (new_encoder == NULL)
686 /* don't break so fail path works correct */
687 fail = 1;
688
689 if (connector->dpms != DRM_MODE_DPMS_ON) {
690 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
691 mode_changed = true;
692 }
693
694 break;
695 }
696 }
697
698 if (new_encoder != connector->encoder) {
699 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
700 mode_changed = true;
701 /* If the encoder is reused for another connector, then
702 * the appropriate crtc will be set later.
703 */
704 if (connector->encoder)
705 connector->encoder->crtc = NULL;
706 connector->encoder = new_encoder;
707 }
708 }
709 drm_connector_list_iter_end(&conn_iter);
710
711 if (fail) {
712 ret = -EINVAL;
713 goto fail;
714 }
715
716 count = 0;
717 drm_connector_list_iter_begin(dev, &conn_iter);
718 drm_for_each_connector_iter(connector, &conn_iter) {
719 if (!connector->encoder)
720 continue;
721
722 if (connector->encoder->crtc == set->crtc)
723 new_crtc = NULL;
724 else
725 new_crtc = connector->encoder->crtc;
726
727 for (ro = 0; ro < set->num_connectors; ro++) {
728 if (set->connectors[ro] == connector)
729 new_crtc = set->crtc;
730 }
731
732 /* Make sure the new CRTC will work with the encoder */
733 if (new_crtc &&
734 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
735 ret = -EINVAL;
736 drm_connector_list_iter_end(&conn_iter);
737 goto fail;
738 }
739 if (new_crtc != connector->encoder->crtc) {
740 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
741 mode_changed = true;
742 connector->encoder->crtc = new_crtc;
743 }
744 if (new_crtc) {
745 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
746 connector->base.id, connector->name,
747 new_crtc->base.id, new_crtc->name);
748 } else {
749 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
750 connector->base.id, connector->name);
751 }
752 }
753 drm_connector_list_iter_end(&conn_iter);
754
755 /* mode_set_base is not a required function */
756 if (fb_changed && !crtc_funcs->mode_set_base)
757 mode_changed = true;
758
759 if (mode_changed) {
760 if (drm_helper_crtc_in_use(set->crtc)) {
761 DRM_DEBUG_KMS("attempting to set mode from"
762 " userspace\n");
763 drm_mode_debug_printmodeline(set->mode);
764 set->crtc->primary->fb = set->fb;
765 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
766 set->x, set->y,
767 save_set.fb)) {
768 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
769 set->crtc->base.id, set->crtc->name);
770 set->crtc->primary->fb = save_set.fb;
771 ret = -EINVAL;
772 goto fail;
773 }
774 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
775 for (i = 0; i < set->num_connectors; i++) {
776 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
777 set->connectors[i]->name);
778 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
779 }
780 }
781 __drm_helper_disable_unused_functions(dev);
782 } else if (fb_changed) {
783 set->crtc->x = set->x;
784 set->crtc->y = set->y;
785 set->crtc->primary->fb = set->fb;
786 ret = crtc_funcs->mode_set_base(set->crtc,
787 set->x, set->y, save_set.fb);
788 if (ret != 0) {
789 set->crtc->x = save_set.x;
790 set->crtc->y = save_set.y;
791 set->crtc->primary->fb = save_set.fb;
792 goto fail;
793 }
794 }
795
796 kfree(save_connector_encoders);
797 kfree(save_encoder_crtcs);
798 return 0;
799
800fail:
801 /* Restore all previous data. */
802 count = 0;
803 drm_for_each_encoder(encoder, dev) {
804 encoder->crtc = save_encoder_crtcs[count++];
805 }
806
807 count = 0;
808 drm_connector_list_iter_begin(dev, &conn_iter);
809 drm_for_each_connector_iter(connector, &conn_iter)
810 connector->encoder = save_connector_encoders[count++];
811 drm_connector_list_iter_end(&conn_iter);
812
813 /* after fail drop reference on all unbound connectors in set, let
814 * bound connectors keep their reference
815 */
816 for (ro = 0; ro < set->num_connectors; ro++) {
817 if (set->connectors[ro]->encoder)
818 continue;
819 drm_connector_put(set->connectors[ro]);
820 }
821
822 /* Try to restore the config */
823 if (mode_changed &&
824 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
825 save_set.y, save_set.fb))
826 DRM_ERROR("failed to restore config after modeset failure\n");
827
828 kfree(save_connector_encoders);
829 kfree(save_encoder_crtcs);
830 return ret;
831}
832EXPORT_SYMBOL(drm_crtc_helper_set_config);
833
834static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
835{
836 int dpms = DRM_MODE_DPMS_OFF;
837 struct drm_connector *connector;
838 struct drm_connector_list_iter conn_iter;
839 struct drm_device *dev = encoder->dev;
840
841 drm_connector_list_iter_begin(dev, &conn_iter);
842 drm_for_each_connector_iter(connector, &conn_iter)
843 if (connector->encoder == encoder)
844 if (connector->dpms < dpms)
845 dpms = connector->dpms;
846 drm_connector_list_iter_end(&conn_iter);
847
848 return dpms;
849}
850
851/* Helper which handles bridge ordering around encoder dpms */
852static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
853{
854 const struct drm_encoder_helper_funcs *encoder_funcs;
855
856 encoder_funcs = encoder->helper_private;
857 if (!encoder_funcs)
858 return;
859
860 if (encoder_funcs->dpms)
861 encoder_funcs->dpms(encoder, mode);
862}
863
864static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
865{
866 int dpms = DRM_MODE_DPMS_OFF;
867 struct drm_connector *connector;
868 struct drm_connector_list_iter conn_iter;
869 struct drm_device *dev = crtc->dev;
870
871 drm_connector_list_iter_begin(dev, &conn_iter);
872 drm_for_each_connector_iter(connector, &conn_iter)
873 if (connector->encoder && connector->encoder->crtc == crtc)
874 if (connector->dpms < dpms)
875 dpms = connector->dpms;
876 drm_connector_list_iter_end(&conn_iter);
877
878 return dpms;
879}
880
881/**
882 * drm_helper_connector_dpms() - connector dpms helper implementation
883 * @connector: affected connector
884 * @mode: DPMS mode
885 *
886 * The drm_helper_connector_dpms() helper function implements the
887 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
888 * helpers.
889 *
890 * This is the main helper function provided by the CRTC helper framework for
891 * implementing the DPMS connector attribute. It computes the new desired DPMS
892 * state for all encoders and CRTCs in the output mesh and calls the
893 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
894 * provided by the driver.
895 *
896 * This function is deprecated. New drivers must implement atomic modeset
897 * support, where DPMS is handled in the DRM core.
898 *
899 * Returns:
900 * Always returns 0.
901 */
902int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
903{
904 struct drm_encoder *encoder = connector->encoder;
905 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
906 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
907
908 WARN_ON(drm_drv_uses_atomic_modeset(connector->dev));
909
910 if (mode == connector->dpms)
911 return 0;
912
913 old_dpms = connector->dpms;
914 connector->dpms = mode;
915
916 if (encoder)
917 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
918
919 /* from off to on, do crtc then encoder */
920 if (mode < old_dpms) {
921 if (crtc) {
922 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
923
924 if (crtc_funcs->dpms)
925 (*crtc_funcs->dpms) (crtc,
926 drm_helper_choose_crtc_dpms(crtc));
927 }
928 if (encoder)
929 drm_helper_encoder_dpms(encoder, encoder_dpms);
930 }
931
932 /* from on to off, do encoder then crtc */
933 if (mode > old_dpms) {
934 if (encoder)
935 drm_helper_encoder_dpms(encoder, encoder_dpms);
936 if (crtc) {
937 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
938
939 if (crtc_funcs->dpms)
940 (*crtc_funcs->dpms) (crtc,
941 drm_helper_choose_crtc_dpms(crtc));
942 }
943 }
944
945 return 0;
946}
947EXPORT_SYMBOL(drm_helper_connector_dpms);
948
949/**
950 * drm_helper_resume_force_mode - force-restore mode setting configuration
951 * @dev: drm_device which should be restored
952 *
953 * Drivers which use the mode setting helpers can use this function to
954 * force-restore the mode setting configuration e.g. on resume or when something
955 * else might have trampled over the hw state (like some overzealous old BIOSen
956 * tended to do).
957 *
958 * This helper doesn't provide a error return value since restoring the old
959 * config should never fail due to resource allocation issues since the driver
960 * has successfully set the restored configuration already. Hence this should
961 * boil down to the equivalent of a few dpms on calls, which also don't provide
962 * an error code.
963 *
964 * Drivers where simply restoring an old configuration again might fail (e.g.
965 * due to slight differences in allocating shared resources when the
966 * configuration is restored in a different order than when userspace set it up)
967 * need to use their own restore logic.
968 *
969 * This function is deprecated. New drivers should implement atomic mode-
970 * setting and use the atomic suspend/resume helpers.
971 *
972 * See also:
973 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
974 */
975void drm_helper_resume_force_mode(struct drm_device *dev)
976{
977 struct drm_crtc *crtc;
978 struct drm_encoder *encoder;
979 const struct drm_crtc_helper_funcs *crtc_funcs;
980 int encoder_dpms;
981 bool ret;
982
983 WARN_ON(drm_drv_uses_atomic_modeset(dev));
984
985 drm_modeset_lock_all(dev);
986 drm_for_each_crtc(crtc, dev) {
987
988 if (!crtc->enabled)
989 continue;
990
991 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
992 crtc->x, crtc->y, crtc->primary->fb);
993
994 /* Restoring the old config should never fail! */
995 if (ret == false)
996 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
997
998 /* Turn off outputs that were already powered off */
999 if (drm_helper_choose_crtc_dpms(crtc)) {
1000 drm_for_each_encoder(encoder, dev) {
1001
1002 if(encoder->crtc != crtc)
1003 continue;
1004
1005 encoder_dpms = drm_helper_choose_encoder_dpms(
1006 encoder);
1007
1008 drm_helper_encoder_dpms(encoder, encoder_dpms);
1009 }
1010
1011 crtc_funcs = crtc->helper_private;
1012 if (crtc_funcs->dpms)
1013 (*crtc_funcs->dpms) (crtc,
1014 drm_helper_choose_crtc_dpms(crtc));
1015 }
1016 }
1017
1018 /* disable the unused connectors while restoring the modesetting */
1019 __drm_helper_disable_unused_functions(dev);
1020 drm_modeset_unlock_all(dev);
1021}
1022EXPORT_SYMBOL(drm_helper_resume_force_mode);
1023
1024/**
1025 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs
1026 * @dev: DRM device whose CRTCs to turn off
1027 *
1028 * Drivers may want to call this on unload to ensure that all displays are
1029 * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
1030 *
1031 * Note: This should only be used by non-atomic legacy drivers. For an atomic
1032 * version look at drm_atomic_helper_shutdown().
1033 *
1034 * Returns:
1035 * Zero on success, error code on failure.
1036 */
1037int drm_helper_force_disable_all(struct drm_device *dev)
1038{
1039 struct drm_crtc *crtc;
1040 int ret = 0;
1041
1042 drm_modeset_lock_all(dev);
1043 drm_for_each_crtc(crtc, dev)
1044 if (crtc->enabled) {
1045 struct drm_mode_set set = {
1046 .crtc = crtc,
1047 };
1048
1049 ret = drm_mode_set_config_internal(&set);
1050 if (ret)
1051 goto out;
1052 }
1053out:
1054 drm_modeset_unlock_all(dev);
1055 return ret;
1056}
1057EXPORT_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);