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, iter: &conn_iter);
126 drm_for_each_connector_iter(connector, &conn_iter) {
127 if (connector->encoder == encoder) {
128 drm_connector_list_iter_end(iter: &conn_iter);
129 return true;
130 }
131 }
132 drm_connector_list_iter_end(iter: &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(dst: &saved_mode, src: &crtc->mode);
313 drm_mode_init(dst: &saved_hwmode, src: &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(dst: &crtc->mode, src: 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(dst: &crtc->hwmode, src: 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, mode: &crtc->hwmode);
420
421 /* FIXME: add subpixel order */
422done:
423 drm_mode_destroy(dev, mode: adjusted_mode);
424 if (!ret) {
425 crtc->enabled = saved_enabled;
426 drm_mode_copy(dst: &crtc->mode, src: &saved_mode);
427 drm_mode_copy(dst: &crtc->hwmode, src: &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.
443 *
444 * This is often the case for the CRTC of simple framebuffers. See also
445 * drm_plane_helper_atomic_check() for the respective plane-state check
446 * helper function.
447 *
448 * RETURNS:
449 * Zero on success, or an errno code otherwise.
450 */
451int drm_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)
452{
453 struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
454
455 if (!new_crtc_state->enable)
456 return 0;
457
458 return drm_atomic_helper_check_crtc_primary_plane(crtc_state: new_crtc_state);
459}
460EXPORT_SYMBOL(drm_crtc_helper_atomic_check);
461
462static void
463drm_crtc_helper_disable(struct drm_crtc *crtc)
464{
465 struct drm_device *dev = crtc->dev;
466 struct drm_connector *connector;
467 struct drm_encoder *encoder;
468
469 /* Decouple all encoders and their attached connectors from this crtc */
470 drm_for_each_encoder(encoder, dev) {
471 struct drm_connector_list_iter conn_iter;
472
473 if (encoder->crtc != crtc)
474 continue;
475
476 drm_connector_list_iter_begin(dev, iter: &conn_iter);
477 drm_for_each_connector_iter(connector, &conn_iter) {
478 if (connector->encoder != encoder)
479 continue;
480
481 connector->encoder = NULL;
482
483 /*
484 * drm_helper_disable_unused_functions() ought to be
485 * doing this, but since we've decoupled the encoder
486 * from the connector above, the required connection
487 * between them is henceforth no longer available.
488 */
489 connector->dpms = DRM_MODE_DPMS_OFF;
490
491 /* we keep a reference while the encoder is bound */
492 drm_connector_put(connector);
493 }
494 drm_connector_list_iter_end(iter: &conn_iter);
495 }
496
497 __drm_helper_disable_unused_functions(dev);
498}
499
500/*
501 * For connectors that support multiple encoders, either the
502 * .atomic_best_encoder() or .best_encoder() operation must be implemented.
503 */
504struct drm_encoder *
505drm_connector_get_single_encoder(struct drm_connector *connector)
506{
507 struct drm_encoder *encoder;
508
509 WARN_ON(hweight32(connector->possible_encoders) > 1);
510 drm_connector_for_each_possible_encoder(connector, encoder)
511 return encoder;
512
513 return NULL;
514}
515
516/**
517 * drm_crtc_helper_set_config - set a new config from userspace
518 * @set: mode set configuration
519 * @ctx: lock acquire context, not used here
520 *
521 * The drm_crtc_helper_set_config() helper function implements the of
522 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
523 * helpers.
524 *
525 * It first tries to locate the best encoder for each connector by calling the
526 * connector @drm_connector_helper_funcs.best_encoder helper operation.
527 *
528 * After locating the appropriate encoders, the helper function will call the
529 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
530 * or reject it completely in which case an error will be returned to the
531 * application. If the new configuration after mode adjustment is identical to
532 * the current configuration the helper function will return without performing
533 * any other operation.
534 *
535 * If the adjusted mode is identical to the current mode but changes to the
536 * frame buffer need to be applied, the drm_crtc_helper_set_config() function
537 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
538 *
539 * If the adjusted mode differs from the current mode, or if the
540 * ->mode_set_base() helper operation is not provided, the helper function
541 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
542 * and ->commit() CRTC and encoder helper operations, in that order.
543 * Alternatively it can also use the dpms and disable helper operations. For
544 * details see &struct drm_crtc_helper_funcs and struct
545 * &drm_encoder_helper_funcs.
546 *
547 * This function is deprecated. New drivers must implement atomic modeset
548 * support, for which this function is unsuitable. Instead drivers should use
549 * drm_atomic_helper_set_config().
550 *
551 * Returns:
552 * Returns 0 on success, negative errno numbers on failure.
553 */
554int drm_crtc_helper_set_config(struct drm_mode_set *set,
555 struct drm_modeset_acquire_ctx *ctx)
556{
557 struct drm_device *dev;
558 struct drm_crtc **save_encoder_crtcs, *new_crtc;
559 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
560 bool mode_changed = false; /* if true do a full mode set */
561 bool fb_changed = false; /* if true and !mode_changed just do a flip */
562 struct drm_connector *connector;
563 struct drm_connector_list_iter conn_iter;
564 int count = 0, ro, fail = 0;
565 const struct drm_crtc_helper_funcs *crtc_funcs;
566 struct drm_mode_set save_set;
567 int ret;
568 int i;
569
570 DRM_DEBUG_KMS("\n");
571
572 BUG_ON(!set);
573 BUG_ON(!set->crtc);
574 BUG_ON(!set->crtc->helper_private);
575
576 /* Enforce sane interface api - has been abused by the fb helper. */
577 BUG_ON(!set->mode && set->fb);
578 BUG_ON(set->fb && set->num_connectors == 0);
579
580 crtc_funcs = set->crtc->helper_private;
581
582 dev = set->crtc->dev;
583 WARN_ON(drm_drv_uses_atomic_modeset(dev));
584
585 if (!set->mode)
586 set->fb = NULL;
587
588 if (set->fb) {
589 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
590 set->crtc->base.id, set->crtc->name,
591 set->fb->base.id,
592 (int)set->num_connectors, set->x, set->y);
593 } else {
594 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
595 set->crtc->base.id, set->crtc->name);
596 drm_crtc_helper_disable(crtc: set->crtc);
597 return 0;
598 }
599
600 drm_warn_on_modeset_not_all_locked(dev);
601
602 /*
603 * Allocate space for the backup of all (non-pointer) encoder and
604 * connector data.
605 */
606 save_encoder_crtcs = kcalloc(n: dev->mode_config.num_encoder,
607 size: sizeof(struct drm_crtc *), GFP_KERNEL);
608 if (!save_encoder_crtcs)
609 return -ENOMEM;
610
611 save_connector_encoders = kcalloc(n: dev->mode_config.num_connector,
612 size: sizeof(struct drm_encoder *), GFP_KERNEL);
613 if (!save_connector_encoders) {
614 kfree(objp: save_encoder_crtcs);
615 return -ENOMEM;
616 }
617
618 /*
619 * Copy data. Note that driver private data is not affected.
620 * Should anything bad happen only the expected state is
621 * restored, not the drivers personal bookkeeping.
622 */
623 count = 0;
624 drm_for_each_encoder(encoder, dev) {
625 save_encoder_crtcs[count++] = encoder->crtc;
626 }
627
628 count = 0;
629 drm_connector_list_iter_begin(dev, iter: &conn_iter);
630 drm_for_each_connector_iter(connector, &conn_iter)
631 save_connector_encoders[count++] = connector->encoder;
632 drm_connector_list_iter_end(iter: &conn_iter);
633
634 save_set.crtc = set->crtc;
635 save_set.mode = &set->crtc->mode;
636 save_set.x = set->crtc->x;
637 save_set.y = set->crtc->y;
638 save_set.fb = set->crtc->primary->fb;
639
640 /* We should be able to check here if the fb has the same properties
641 * and then just flip_or_move it */
642 if (set->crtc->primary->fb != set->fb) {
643 /* If we have no fb then treat it as a full mode set */
644 if (set->crtc->primary->fb == NULL) {
645 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
646 mode_changed = true;
647 } else if (set->fb->format != set->crtc->primary->fb->format) {
648 mode_changed = true;
649 } else
650 fb_changed = true;
651 }
652
653 if (set->x != set->crtc->x || set->y != set->crtc->y)
654 fb_changed = true;
655
656 if (!drm_mode_equal(mode1: set->mode, mode2: &set->crtc->mode)) {
657 DRM_DEBUG_KMS("modes are different, full mode set\n");
658 drm_mode_debug_printmodeline(mode: &set->crtc->mode);
659 drm_mode_debug_printmodeline(mode: set->mode);
660 mode_changed = true;
661 }
662
663 /* take a reference on all unbound connectors in set, reuse the
664 * already taken reference for bound connectors
665 */
666 for (ro = 0; ro < set->num_connectors; ro++) {
667 if (set->connectors[ro]->encoder)
668 continue;
669 drm_connector_get(connector: set->connectors[ro]);
670 }
671
672 /* a) traverse passed in connector list and get encoders for them */
673 count = 0;
674 drm_connector_list_iter_begin(dev, iter: &conn_iter);
675 drm_for_each_connector_iter(connector, &conn_iter) {
676 const struct drm_connector_helper_funcs *connector_funcs =
677 connector->helper_private;
678 new_encoder = connector->encoder;
679 for (ro = 0; ro < set->num_connectors; ro++) {
680 if (set->connectors[ro] == connector) {
681 if (connector_funcs->best_encoder)
682 new_encoder = connector_funcs->best_encoder(connector);
683 else
684 new_encoder = drm_connector_get_single_encoder(connector);
685
686 /* if we can't get an encoder for a connector
687 we are setting now - then fail */
688 if (new_encoder == NULL)
689 /* don't break so fail path works correct */
690 fail = 1;
691
692 if (connector->dpms != DRM_MODE_DPMS_ON) {
693 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
694 mode_changed = true;
695 }
696
697 break;
698 }
699 }
700
701 if (new_encoder != connector->encoder) {
702 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
703 mode_changed = true;
704 /* If the encoder is reused for another connector, then
705 * the appropriate crtc will be set later.
706 */
707 if (connector->encoder)
708 connector->encoder->crtc = NULL;
709 connector->encoder = new_encoder;
710 }
711 }
712 drm_connector_list_iter_end(iter: &conn_iter);
713
714 if (fail) {
715 ret = -EINVAL;
716 goto fail;
717 }
718
719 count = 0;
720 drm_connector_list_iter_begin(dev, iter: &conn_iter);
721 drm_for_each_connector_iter(connector, &conn_iter) {
722 if (!connector->encoder)
723 continue;
724
725 if (connector->encoder->crtc == set->crtc)
726 new_crtc = NULL;
727 else
728 new_crtc = connector->encoder->crtc;
729
730 for (ro = 0; ro < set->num_connectors; ro++) {
731 if (set->connectors[ro] == connector)
732 new_crtc = set->crtc;
733 }
734
735 /* Make sure the new CRTC will work with the encoder */
736 if (new_crtc &&
737 !drm_encoder_crtc_ok(encoder: connector->encoder, crtc: new_crtc)) {
738 ret = -EINVAL;
739 drm_connector_list_iter_end(iter: &conn_iter);
740 goto fail;
741 }
742 if (new_crtc != connector->encoder->crtc) {
743 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
744 mode_changed = true;
745 connector->encoder->crtc = new_crtc;
746 }
747 if (new_crtc) {
748 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
749 connector->base.id, connector->name,
750 new_crtc->base.id, new_crtc->name);
751 } else {
752 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
753 connector->base.id, connector->name);
754 }
755 }
756 drm_connector_list_iter_end(iter: &conn_iter);
757
758 /* mode_set_base is not a required function */
759 if (fb_changed && !crtc_funcs->mode_set_base)
760 mode_changed = true;
761
762 if (mode_changed) {
763 if (drm_helper_crtc_in_use(set->crtc)) {
764 DRM_DEBUG_KMS("attempting to set mode from"
765 " userspace\n");
766 drm_mode_debug_printmodeline(mode: set->mode);
767 set->crtc->primary->fb = set->fb;
768 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
769 set->x, set->y,
770 save_set.fb)) {
771 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
772 set->crtc->base.id, set->crtc->name);
773 set->crtc->primary->fb = save_set.fb;
774 ret = -EINVAL;
775 goto fail;
776 }
777 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
778 for (i = 0; i < set->num_connectors; i++) {
779 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
780 set->connectors[i]->name);
781 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
782 }
783 }
784 __drm_helper_disable_unused_functions(dev);
785 } else if (fb_changed) {
786 set->crtc->x = set->x;
787 set->crtc->y = set->y;
788 set->crtc->primary->fb = set->fb;
789 ret = crtc_funcs->mode_set_base(set->crtc,
790 set->x, set->y, save_set.fb);
791 if (ret != 0) {
792 set->crtc->x = save_set.x;
793 set->crtc->y = save_set.y;
794 set->crtc->primary->fb = save_set.fb;
795 goto fail;
796 }
797 }
798
799 kfree(objp: save_connector_encoders);
800 kfree(objp: save_encoder_crtcs);
801 return 0;
802
803fail:
804 /* Restore all previous data. */
805 count = 0;
806 drm_for_each_encoder(encoder, dev) {
807 encoder->crtc = save_encoder_crtcs[count++];
808 }
809
810 count = 0;
811 drm_connector_list_iter_begin(dev, iter: &conn_iter);
812 drm_for_each_connector_iter(connector, &conn_iter)
813 connector->encoder = save_connector_encoders[count++];
814 drm_connector_list_iter_end(iter: &conn_iter);
815
816 /* after fail drop reference on all unbound connectors in set, let
817 * bound connectors keep their reference
818 */
819 for (ro = 0; ro < set->num_connectors; ro++) {
820 if (set->connectors[ro]->encoder)
821 continue;
822 drm_connector_put(connector: set->connectors[ro]);
823 }
824
825 /* Try to restore the config */
826 if (mode_changed &&
827 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
828 save_set.y, save_set.fb))
829 DRM_ERROR("failed to restore config after modeset failure\n");
830
831 kfree(objp: save_connector_encoders);
832 kfree(objp: save_encoder_crtcs);
833 return ret;
834}
835EXPORT_SYMBOL(drm_crtc_helper_set_config);
836
837static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
838{
839 int dpms = DRM_MODE_DPMS_OFF;
840 struct drm_connector *connector;
841 struct drm_connector_list_iter conn_iter;
842 struct drm_device *dev = encoder->dev;
843
844 drm_connector_list_iter_begin(dev, iter: &conn_iter);
845 drm_for_each_connector_iter(connector, &conn_iter)
846 if (connector->encoder == encoder)
847 if (connector->dpms < dpms)
848 dpms = connector->dpms;
849 drm_connector_list_iter_end(iter: &conn_iter);
850
851 return dpms;
852}
853
854/* Helper which handles bridge ordering around encoder dpms */
855static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
856{
857 const struct drm_encoder_helper_funcs *encoder_funcs;
858
859 encoder_funcs = encoder->helper_private;
860 if (!encoder_funcs)
861 return;
862
863 if (encoder_funcs->dpms)
864 encoder_funcs->dpms(encoder, mode);
865}
866
867static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
868{
869 int dpms = DRM_MODE_DPMS_OFF;
870 struct drm_connector *connector;
871 struct drm_connector_list_iter conn_iter;
872 struct drm_device *dev = crtc->dev;
873
874 drm_connector_list_iter_begin(dev, iter: &conn_iter);
875 drm_for_each_connector_iter(connector, &conn_iter)
876 if (connector->encoder && connector->encoder->crtc == crtc)
877 if (connector->dpms < dpms)
878 dpms = connector->dpms;
879 drm_connector_list_iter_end(iter: &conn_iter);
880
881 return dpms;
882}
883
884/**
885 * drm_helper_connector_dpms() - connector dpms helper implementation
886 * @connector: affected connector
887 * @mode: DPMS mode
888 *
889 * The drm_helper_connector_dpms() helper function implements the
890 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
891 * helpers.
892 *
893 * This is the main helper function provided by the CRTC helper framework for
894 * implementing the DPMS connector attribute. It computes the new desired DPMS
895 * state for all encoders and CRTCs in the output mesh and calls the
896 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
897 * provided by the driver.
898 *
899 * This function is deprecated. New drivers must implement atomic modeset
900 * support, where DPMS is handled in the DRM core.
901 *
902 * Returns:
903 * Always returns 0.
904 */
905int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
906{
907 struct drm_encoder *encoder = connector->encoder;
908 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
909 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
910
911 WARN_ON(drm_drv_uses_atomic_modeset(connector->dev));
912
913 if (mode == connector->dpms)
914 return 0;
915
916 old_dpms = connector->dpms;
917 connector->dpms = mode;
918
919 if (encoder)
920 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
921
922 /* from off to on, do crtc then encoder */
923 if (mode < old_dpms) {
924 if (crtc) {
925 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
926
927 if (crtc_funcs->dpms)
928 (*crtc_funcs->dpms) (crtc,
929 drm_helper_choose_crtc_dpms(crtc));
930 }
931 if (encoder)
932 drm_helper_encoder_dpms(encoder, mode: encoder_dpms);
933 }
934
935 /* from on to off, do encoder then crtc */
936 if (mode > old_dpms) {
937 if (encoder)
938 drm_helper_encoder_dpms(encoder, mode: encoder_dpms);
939 if (crtc) {
940 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
941
942 if (crtc_funcs->dpms)
943 (*crtc_funcs->dpms) (crtc,
944 drm_helper_choose_crtc_dpms(crtc));
945 }
946 }
947
948 return 0;
949}
950EXPORT_SYMBOL(drm_helper_connector_dpms);
951
952/**
953 * drm_helper_resume_force_mode - force-restore mode setting configuration
954 * @dev: drm_device which should be restored
955 *
956 * Drivers which use the mode setting helpers can use this function to
957 * force-restore the mode setting configuration e.g. on resume or when something
958 * else might have trampled over the hw state (like some overzealous old BIOSen
959 * tended to do).
960 *
961 * This helper doesn't provide a error return value since restoring the old
962 * config should never fail due to resource allocation issues since the driver
963 * has successfully set the restored configuration already. Hence this should
964 * boil down to the equivalent of a few dpms on calls, which also don't provide
965 * an error code.
966 *
967 * Drivers where simply restoring an old configuration again might fail (e.g.
968 * due to slight differences in allocating shared resources when the
969 * configuration is restored in a different order than when userspace set it up)
970 * need to use their own restore logic.
971 *
972 * This function is deprecated. New drivers should implement atomic mode-
973 * setting and use the atomic suspend/resume helpers.
974 *
975 * See also:
976 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
977 */
978void drm_helper_resume_force_mode(struct drm_device *dev)
979{
980 struct drm_crtc *crtc;
981 struct drm_encoder *encoder;
982 const struct drm_crtc_helper_funcs *crtc_funcs;
983 int encoder_dpms;
984 bool ret;
985
986 WARN_ON(drm_drv_uses_atomic_modeset(dev));
987
988 drm_modeset_lock_all(dev);
989 drm_for_each_crtc(crtc, dev) {
990
991 if (!crtc->enabled)
992 continue;
993
994 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
995 crtc->x, crtc->y, crtc->primary->fb);
996
997 /* Restoring the old config should never fail! */
998 if (ret == false)
999 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
1000
1001 /* Turn off outputs that were already powered off */
1002 if (drm_helper_choose_crtc_dpms(crtc)) {
1003 drm_for_each_encoder(encoder, dev) {
1004
1005 if(encoder->crtc != crtc)
1006 continue;
1007
1008 encoder_dpms = drm_helper_choose_encoder_dpms(
1009 encoder);
1010
1011 drm_helper_encoder_dpms(encoder, mode: encoder_dpms);
1012 }
1013
1014 crtc_funcs = crtc->helper_private;
1015 if (crtc_funcs->dpms)
1016 (*crtc_funcs->dpms) (crtc,
1017 drm_helper_choose_crtc_dpms(crtc));
1018 }
1019 }
1020
1021 /* disable the unused connectors while restoring the modesetting */
1022 __drm_helper_disable_unused_functions(dev);
1023 drm_modeset_unlock_all(dev);
1024}
1025EXPORT_SYMBOL(drm_helper_resume_force_mode);
1026
1027/**
1028 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs
1029 * @dev: DRM device whose CRTCs to turn off
1030 *
1031 * Drivers may want to call this on unload to ensure that all displays are
1032 * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
1033 *
1034 * Note: This should only be used by non-atomic legacy drivers. For an atomic
1035 * version look at drm_atomic_helper_shutdown().
1036 *
1037 * Returns:
1038 * Zero on success, error code on failure.
1039 */
1040int drm_helper_force_disable_all(struct drm_device *dev)
1041{
1042 struct drm_crtc *crtc;
1043 int ret = 0;
1044
1045 drm_modeset_lock_all(dev);
1046 drm_for_each_crtc(crtc, dev)
1047 if (crtc->enabled) {
1048 struct drm_mode_set set = {
1049 .crtc = crtc,
1050 };
1051
1052 ret = drm_mode_set_config_internal(set: &set);
1053 if (ret)
1054 goto out;
1055 }
1056out:
1057 drm_modeset_unlock_all(dev);
1058 return ret;
1059}
1060EXPORT_SYMBOL(drm_helper_force_disable_all);
1061

source code of linux/drivers/gpu/drm/drm_crtc_helper.c