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 drm_WARN_ON(dev, 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 drm_WARN_ON(dev, !mutex_is_locked(&dev->mode_config.mutex));
121 drm_WARN_ON(dev, !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 drm_WARN_ON(dev, 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 drm_WARN_ON(dev, !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 drm_WARN_ON(dev, 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 drm_WARN_ON(dev, 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 if (encoder_funcs->mode_fixup) {
338 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
339 adjusted_mode))) {
340 drm_dbg_kms(dev, "[ENCODER:%d:%s] mode fixup failed\n",
341 encoder->base.id, encoder->name);
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_dbg_kms(dev, "[CRTC:%d:%s] mode fixup failed\n",
351 crtc->base.id, crtc->name);
352 goto done;
353 }
354 }
355 drm_dbg_kms(dev, "[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
356
357 drm_mode_copy(dst: &crtc->hwmode, src: adjusted_mode);
358
359 /* Prepare the encoders and CRTCs before setting the mode. */
360 drm_for_each_encoder(encoder, dev) {
361
362 if (encoder->crtc != crtc)
363 continue;
364
365 encoder_funcs = encoder->helper_private;
366 if (!encoder_funcs)
367 continue;
368
369 /* Disable the encoders as the first thing we do. */
370 if (encoder_funcs->prepare)
371 encoder_funcs->prepare(encoder);
372 }
373
374 drm_crtc_prepare_encoders(dev);
375
376 crtc_funcs->prepare(crtc);
377
378 /* Set up the DPLL and any encoders state that needs to adjust or depend
379 * on the DPLL.
380 */
381 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
382 if (!ret)
383 goto done;
384
385 drm_for_each_encoder(encoder, dev) {
386
387 if (encoder->crtc != crtc)
388 continue;
389
390 encoder_funcs = encoder->helper_private;
391 if (!encoder_funcs)
392 continue;
393
394 drm_dbg_kms(dev, "[ENCODER:%d:%s] set [MODE:%s]\n",
395 encoder->base.id, encoder->name, mode->name);
396 if (encoder_funcs->mode_set)
397 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
398 }
399
400 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
401 crtc_funcs->commit(crtc);
402
403 drm_for_each_encoder(encoder, dev) {
404
405 if (encoder->crtc != crtc)
406 continue;
407
408 encoder_funcs = encoder->helper_private;
409 if (!encoder_funcs)
410 continue;
411
412 if (encoder_funcs->commit)
413 encoder_funcs->commit(encoder);
414 }
415
416 /* Calculate and store various constants which
417 * are later needed by vblank and swap-completion
418 * timestamping. They are derived from true hwmode.
419 */
420 drm_calc_timestamping_constants(crtc, mode: &crtc->hwmode);
421
422 /* FIXME: add subpixel order */
423done:
424 drm_mode_destroy(dev, mode: adjusted_mode);
425 if (!ret) {
426 crtc->enabled = saved_enabled;
427 drm_mode_copy(dst: &crtc->mode, src: &saved_mode);
428 drm_mode_copy(dst: &crtc->hwmode, src: &saved_hwmode);
429 crtc->x = saved_x;
430 crtc->y = saved_y;
431 }
432
433 return ret;
434}
435EXPORT_SYMBOL(drm_crtc_helper_set_mode);
436
437/**
438 * drm_crtc_helper_atomic_check() - Helper to check CRTC atomic-state
439 * @crtc: CRTC to check
440 * @state: atomic state object
441 *
442 * Provides a default CRTC-state check handler for CRTCs that only have
443 * one primary plane attached to it. This is often the case for the CRTC
444 * of simple framebuffers.
445 *
446 * RETURNS:
447 * Zero on success, or an errno code otherwise.
448 */
449int drm_crtc_helper_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)
450{
451 struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
452
453 if (!new_crtc_state->enable)
454 return 0;
455
456 return drm_atomic_helper_check_crtc_primary_plane(crtc_state: new_crtc_state);
457}
458EXPORT_SYMBOL(drm_crtc_helper_atomic_check);
459
460static void
461drm_crtc_helper_disable(struct drm_crtc *crtc)
462{
463 struct drm_device *dev = crtc->dev;
464 struct drm_connector *connector;
465 struct drm_encoder *encoder;
466
467 /* Decouple all encoders and their attached connectors from this crtc */
468 drm_for_each_encoder(encoder, dev) {
469 struct drm_connector_list_iter conn_iter;
470
471 if (encoder->crtc != crtc)
472 continue;
473
474 drm_connector_list_iter_begin(dev, iter: &conn_iter);
475 drm_for_each_connector_iter(connector, &conn_iter) {
476 if (connector->encoder != encoder)
477 continue;
478
479 connector->encoder = NULL;
480
481 /*
482 * drm_helper_disable_unused_functions() ought to be
483 * doing this, but since we've decoupled the encoder
484 * from the connector above, the required connection
485 * between them is henceforth no longer available.
486 */
487 connector->dpms = DRM_MODE_DPMS_OFF;
488
489 /* we keep a reference while the encoder is bound */
490 drm_connector_put(connector);
491 }
492 drm_connector_list_iter_end(iter: &conn_iter);
493 }
494
495 __drm_helper_disable_unused_functions(dev);
496}
497
498/*
499 * For connectors that support multiple encoders, either the
500 * .atomic_best_encoder() or .best_encoder() operation must be implemented.
501 */
502struct drm_encoder *
503drm_connector_get_single_encoder(struct drm_connector *connector)
504{
505 struct drm_encoder *encoder;
506
507 drm_WARN_ON(connector->dev, hweight32(connector->possible_encoders) > 1);
508 drm_connector_for_each_possible_encoder(connector, encoder)
509 return encoder;
510
511 return NULL;
512}
513
514/**
515 * drm_crtc_helper_set_config - set a new config from userspace
516 * @set: mode set configuration
517 * @ctx: lock acquire context, not used here
518 *
519 * The drm_crtc_helper_set_config() helper function implements the of
520 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
521 * helpers.
522 *
523 * It first tries to locate the best encoder for each connector by calling the
524 * connector @drm_connector_helper_funcs.best_encoder helper operation.
525 *
526 * After locating the appropriate encoders, the helper function will call the
527 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
528 * or reject it completely in which case an error will be returned to the
529 * application. If the new configuration after mode adjustment is identical to
530 * the current configuration the helper function will return without performing
531 * any other operation.
532 *
533 * If the adjusted mode is identical to the current mode but changes to the
534 * frame buffer need to be applied, the drm_crtc_helper_set_config() function
535 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
536 *
537 * If the adjusted mode differs from the current mode, or if the
538 * ->mode_set_base() helper operation is not provided, the helper function
539 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
540 * and ->commit() CRTC and encoder helper operations, in that order.
541 * Alternatively it can also use the dpms and disable helper operations. For
542 * details see &struct drm_crtc_helper_funcs and struct
543 * &drm_encoder_helper_funcs.
544 *
545 * This function is deprecated. New drivers must implement atomic modeset
546 * support, for which this function is unsuitable. Instead drivers should use
547 * drm_atomic_helper_set_config().
548 *
549 * Returns:
550 * Returns 0 on success, negative errno numbers on failure.
551 */
552int drm_crtc_helper_set_config(struct drm_mode_set *set,
553 struct drm_modeset_acquire_ctx *ctx)
554{
555 struct drm_device *dev;
556 struct drm_crtc **save_encoder_crtcs, *new_crtc;
557 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
558 bool mode_changed = false; /* if true do a full mode set */
559 bool fb_changed = false; /* if true and !mode_changed just do a flip */
560 struct drm_connector *connector;
561 struct drm_connector_list_iter conn_iter;
562 int count = 0, ro, fail = 0;
563 const struct drm_crtc_helper_funcs *crtc_funcs;
564 struct drm_mode_set save_set;
565 int ret;
566 int i;
567
568 BUG_ON(!set);
569 BUG_ON(!set->crtc);
570 BUG_ON(!set->crtc->helper_private);
571
572 /* Enforce sane interface api - has been abused by the fb helper. */
573 BUG_ON(!set->mode && set->fb);
574 BUG_ON(set->fb && set->num_connectors == 0);
575
576 crtc_funcs = set->crtc->helper_private;
577
578 dev = set->crtc->dev;
579
580 drm_dbg_kms(dev, "\n");
581
582 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
583
584 if (!set->mode)
585 set->fb = NULL;
586
587 if (set->fb) {
588 drm_dbg_kms(dev, "[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
589 set->crtc->base.id, set->crtc->name,
590 set->fb->base.id,
591 (int)set->num_connectors, set->x, set->y);
592 } else {
593 drm_dbg_kms(dev, "[CRTC:%d:%s] [NOFB]\n",
594 set->crtc->base.id, set->crtc->name);
595 drm_crtc_helper_disable(crtc: set->crtc);
596 return 0;
597 }
598
599 drm_warn_on_modeset_not_all_locked(dev);
600
601 /*
602 * Allocate space for the backup of all (non-pointer) encoder and
603 * connector data.
604 */
605 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder,
606 sizeof(struct drm_crtc *), GFP_KERNEL);
607 if (!save_encoder_crtcs)
608 return -ENOMEM;
609
610 save_connector_encoders = kcalloc(dev->mode_config.num_connector,
611 sizeof(struct drm_encoder *), GFP_KERNEL);
612 if (!save_connector_encoders) {
613 kfree(objp: save_encoder_crtcs);
614 return -ENOMEM;
615 }
616
617 /*
618 * Copy data. Note that driver private data is not affected.
619 * Should anything bad happen only the expected state is
620 * restored, not the drivers personal bookkeeping.
621 */
622 count = 0;
623 drm_for_each_encoder(encoder, dev) {
624 save_encoder_crtcs[count++] = encoder->crtc;
625 }
626
627 count = 0;
628 drm_connector_list_iter_begin(dev, iter: &conn_iter);
629 drm_for_each_connector_iter(connector, &conn_iter)
630 save_connector_encoders[count++] = connector->encoder;
631 drm_connector_list_iter_end(iter: &conn_iter);
632
633 save_set.crtc = set->crtc;
634 save_set.mode = &set->crtc->mode;
635 save_set.x = set->crtc->x;
636 save_set.y = set->crtc->y;
637 save_set.fb = set->crtc->primary->fb;
638
639 /* We should be able to check here if the fb has the same properties
640 * and then just flip_or_move it */
641 if (set->crtc->primary->fb != set->fb) {
642 /* If we have no fb then treat it as a full mode set */
643 if (set->crtc->primary->fb == NULL) {
644 drm_dbg_kms(dev, "[CRTC:%d:%s] no fb, full mode set\n",
645 set->crtc->base.id, set->crtc->name);
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_dbg_kms(dev, "[CRTC:%d:%s] modes are different, full mode set:\n",
658 set->crtc->base.id, set->crtc->name);
659 drm_dbg_kms(dev, DRM_MODE_FMT "\n", DRM_MODE_ARG(&set->crtc->mode));
660 drm_dbg_kms(dev, DRM_MODE_FMT "\n", DRM_MODE_ARG(set->mode));
661 mode_changed = true;
662 }
663
664 /* take a reference on all unbound connectors in set, reuse the
665 * already taken reference for bound connectors
666 */
667 for (ro = 0; ro < set->num_connectors; ro++) {
668 if (set->connectors[ro]->encoder)
669 continue;
670 drm_connector_get(connector: set->connectors[ro]);
671 }
672
673 /* a) traverse passed in connector list and get encoders for them */
674 count = 0;
675 drm_connector_list_iter_begin(dev, iter: &conn_iter);
676 drm_for_each_connector_iter(connector, &conn_iter) {
677 const struct drm_connector_helper_funcs *connector_funcs =
678 connector->helper_private;
679 new_encoder = connector->encoder;
680 for (ro = 0; ro < set->num_connectors; ro++) {
681 if (set->connectors[ro] == connector) {
682 if (connector_funcs->best_encoder)
683 new_encoder = connector_funcs->best_encoder(connector);
684 else
685 new_encoder = drm_connector_get_single_encoder(connector);
686
687 /* if we can't get an encoder for a connector
688 we are setting now - then fail */
689 if (new_encoder == NULL)
690 /* don't break so fail path works correct */
691 fail = 1;
692
693 if (connector->dpms != DRM_MODE_DPMS_ON) {
694 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] DPMS not on, full mode switch\n",
695 connector->base.id, connector->name);
696 mode_changed = true;
697 }
698
699 break;
700 }
701 }
702
703 if (new_encoder != connector->encoder) {
704 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] encoder changed, full mode switch\n",
705 connector->base.id, connector->name);
706 mode_changed = true;
707 /* If the encoder is reused for another connector, then
708 * the appropriate crtc will be set later.
709 */
710 if (connector->encoder)
711 connector->encoder->crtc = NULL;
712 connector->encoder = new_encoder;
713 }
714 }
715 drm_connector_list_iter_end(iter: &conn_iter);
716
717 if (fail) {
718 ret = -EINVAL;
719 goto fail;
720 }
721
722 count = 0;
723 drm_connector_list_iter_begin(dev, iter: &conn_iter);
724 drm_for_each_connector_iter(connector, &conn_iter) {
725 if (!connector->encoder)
726 continue;
727
728 if (connector->encoder->crtc == set->crtc)
729 new_crtc = NULL;
730 else
731 new_crtc = connector->encoder->crtc;
732
733 for (ro = 0; ro < set->num_connectors; ro++) {
734 if (set->connectors[ro] == connector)
735 new_crtc = set->crtc;
736 }
737
738 /* Make sure the new CRTC will work with the encoder */
739 if (new_crtc &&
740 !drm_encoder_crtc_ok(encoder: connector->encoder, crtc: new_crtc)) {
741 ret = -EINVAL;
742 drm_connector_list_iter_end(iter: &conn_iter);
743 goto fail;
744 }
745 if (new_crtc != connector->encoder->crtc) {
746 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] CRTC changed, full mode switch\n",
747 connector->base.id, connector->name);
748 mode_changed = true;
749 connector->encoder->crtc = new_crtc;
750 }
751 if (new_crtc) {
752 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
753 connector->base.id, connector->name,
754 new_crtc->base.id, new_crtc->name);
755 } else {
756 drm_dbg_kms(dev, "[CONNECTOR:%d:%s] to [NOCRTC]\n",
757 connector->base.id, connector->name);
758 }
759 }
760 drm_connector_list_iter_end(iter: &conn_iter);
761
762 /* mode_set_base is not a required function */
763 if (fb_changed && !crtc_funcs->mode_set_base)
764 mode_changed = true;
765
766 if (mode_changed) {
767 if (drm_helper_crtc_in_use(set->crtc)) {
768 drm_dbg_kms(dev, "[CRTC:%d:%s] attempting to set mode from userspace: " DRM_MODE_FMT "\n",
769 set->crtc->base.id, set->crtc->name, DRM_MODE_ARG(set->mode));
770 set->crtc->primary->fb = set->fb;
771 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
772 set->x, set->y,
773 save_set.fb)) {
774 drm_err(dev, "[CRTC:%d:%s] failed to set mode\n",
775 set->crtc->base.id, set->crtc->name);
776 set->crtc->primary->fb = save_set.fb;
777 ret = -EINVAL;
778 goto fail;
779 }
780 drm_dbg_kms(dev, "[CRTC:%d:%s] Setting connector DPMS state to on\n",
781 set->crtc->base.id, set->crtc->name);
782 for (i = 0; i < set->num_connectors; i++) {
783 drm_dbg_kms(dev, "\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
784 set->connectors[i]->name);
785 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
786 }
787 }
788 __drm_helper_disable_unused_functions(dev);
789 } else if (fb_changed) {
790 set->crtc->x = set->x;
791 set->crtc->y = set->y;
792 set->crtc->primary->fb = set->fb;
793 ret = crtc_funcs->mode_set_base(set->crtc,
794 set->x, set->y, save_set.fb);
795 if (ret != 0) {
796 set->crtc->x = save_set.x;
797 set->crtc->y = save_set.y;
798 set->crtc->primary->fb = save_set.fb;
799 goto fail;
800 }
801 }
802
803 kfree(objp: save_connector_encoders);
804 kfree(objp: save_encoder_crtcs);
805 return 0;
806
807fail:
808 /* Restore all previous data. */
809 count = 0;
810 drm_for_each_encoder(encoder, dev) {
811 encoder->crtc = save_encoder_crtcs[count++];
812 }
813
814 count = 0;
815 drm_connector_list_iter_begin(dev, iter: &conn_iter);
816 drm_for_each_connector_iter(connector, &conn_iter)
817 connector->encoder = save_connector_encoders[count++];
818 drm_connector_list_iter_end(iter: &conn_iter);
819
820 /* after fail drop reference on all unbound connectors in set, let
821 * bound connectors keep their reference
822 */
823 for (ro = 0; ro < set->num_connectors; ro++) {
824 if (set->connectors[ro]->encoder)
825 continue;
826 drm_connector_put(connector: set->connectors[ro]);
827 }
828
829 /* Try to restore the config */
830 if (mode_changed &&
831 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
832 save_set.y, save_set.fb))
833 drm_err(dev, "failed to restore config after modeset failure\n");
834
835 kfree(objp: save_connector_encoders);
836 kfree(objp: save_encoder_crtcs);
837 return ret;
838}
839EXPORT_SYMBOL(drm_crtc_helper_set_config);
840
841static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
842{
843 int dpms = DRM_MODE_DPMS_OFF;
844 struct drm_connector *connector;
845 struct drm_connector_list_iter conn_iter;
846 struct drm_device *dev = encoder->dev;
847
848 drm_connector_list_iter_begin(dev, iter: &conn_iter);
849 drm_for_each_connector_iter(connector, &conn_iter)
850 if (connector->encoder == encoder)
851 if (connector->dpms < dpms)
852 dpms = connector->dpms;
853 drm_connector_list_iter_end(iter: &conn_iter);
854
855 return dpms;
856}
857
858/* Helper which handles bridge ordering around encoder dpms */
859static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
860{
861 const struct drm_encoder_helper_funcs *encoder_funcs;
862
863 encoder_funcs = encoder->helper_private;
864 if (!encoder_funcs)
865 return;
866
867 if (encoder_funcs->dpms)
868 encoder_funcs->dpms(encoder, mode);
869}
870
871static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
872{
873 int dpms = DRM_MODE_DPMS_OFF;
874 struct drm_connector *connector;
875 struct drm_connector_list_iter conn_iter;
876 struct drm_device *dev = crtc->dev;
877
878 drm_connector_list_iter_begin(dev, iter: &conn_iter);
879 drm_for_each_connector_iter(connector, &conn_iter)
880 if (connector->encoder && connector->encoder->crtc == crtc)
881 if (connector->dpms < dpms)
882 dpms = connector->dpms;
883 drm_connector_list_iter_end(iter: &conn_iter);
884
885 return dpms;
886}
887
888/**
889 * drm_helper_connector_dpms() - connector dpms helper implementation
890 * @connector: affected connector
891 * @mode: DPMS mode
892 *
893 * The drm_helper_connector_dpms() helper function implements the
894 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
895 * helpers.
896 *
897 * This is the main helper function provided by the CRTC helper framework for
898 * implementing the DPMS connector attribute. It computes the new desired DPMS
899 * state for all encoders and CRTCs in the output mesh and calls the
900 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
901 * provided by the driver.
902 *
903 * This function is deprecated. New drivers must implement atomic modeset
904 * support, where DPMS is handled in the DRM core.
905 *
906 * Returns:
907 * Always returns 0.
908 */
909int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
910{
911 struct drm_encoder *encoder = connector->encoder;
912 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
913 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
914
915 drm_WARN_ON(connector->dev, drm_drv_uses_atomic_modeset(connector->dev));
916
917 if (mode == connector->dpms)
918 return 0;
919
920 old_dpms = connector->dpms;
921 connector->dpms = mode;
922
923 if (encoder)
924 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
925
926 /* from off to on, do crtc then encoder */
927 if (mode < old_dpms) {
928 if (crtc) {
929 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
930
931 if (crtc_funcs->dpms)
932 (*crtc_funcs->dpms) (crtc,
933 drm_helper_choose_crtc_dpms(crtc));
934 }
935 if (encoder)
936 drm_helper_encoder_dpms(encoder, mode: encoder_dpms);
937 }
938
939 /* from on to off, do encoder then crtc */
940 if (mode > old_dpms) {
941 if (encoder)
942 drm_helper_encoder_dpms(encoder, mode: encoder_dpms);
943 if (crtc) {
944 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
945
946 if (crtc_funcs->dpms)
947 (*crtc_funcs->dpms) (crtc,
948 drm_helper_choose_crtc_dpms(crtc));
949 }
950 }
951
952 return 0;
953}
954EXPORT_SYMBOL(drm_helper_connector_dpms);
955
956/**
957 * drm_helper_resume_force_mode - force-restore mode setting configuration
958 * @dev: drm_device which should be restored
959 *
960 * Drivers which use the mode setting helpers can use this function to
961 * force-restore the mode setting configuration e.g. on resume or when something
962 * else might have trampled over the hw state (like some overzealous old BIOSen
963 * tended to do).
964 *
965 * This helper doesn't provide a error return value since restoring the old
966 * config should never fail due to resource allocation issues since the driver
967 * has successfully set the restored configuration already. Hence this should
968 * boil down to the equivalent of a few dpms on calls, which also don't provide
969 * an error code.
970 *
971 * Drivers where simply restoring an old configuration again might fail (e.g.
972 * due to slight differences in allocating shared resources when the
973 * configuration is restored in a different order than when userspace set it up)
974 * need to use their own restore logic.
975 *
976 * This function is deprecated. New drivers should implement atomic mode-
977 * setting and use the atomic suspend/resume helpers.
978 *
979 * See also:
980 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
981 */
982void drm_helper_resume_force_mode(struct drm_device *dev)
983{
984 struct drm_crtc *crtc;
985 struct drm_encoder *encoder;
986 const struct drm_crtc_helper_funcs *crtc_funcs;
987 int encoder_dpms;
988 bool ret;
989
990 drm_WARN_ON(dev, drm_drv_uses_atomic_modeset(dev));
991
992 drm_modeset_lock_all(dev);
993 drm_for_each_crtc(crtc, dev) {
994
995 if (!crtc->enabled)
996 continue;
997
998 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
999 crtc->x, crtc->y, crtc->primary->fb);
1000
1001 /* Restoring the old config should never fail! */
1002 if (ret == false)
1003 drm_err(dev, "failed to set mode on crtc %p\n", crtc);
1004
1005 /* Turn off outputs that were already powered off */
1006 if (drm_helper_choose_crtc_dpms(crtc)) {
1007 drm_for_each_encoder(encoder, dev) {
1008
1009 if(encoder->crtc != crtc)
1010 continue;
1011
1012 encoder_dpms = drm_helper_choose_encoder_dpms(
1013 encoder);
1014
1015 drm_helper_encoder_dpms(encoder, mode: encoder_dpms);
1016 }
1017
1018 crtc_funcs = crtc->helper_private;
1019 if (crtc_funcs->dpms)
1020 (*crtc_funcs->dpms) (crtc,
1021 drm_helper_choose_crtc_dpms(crtc));
1022 }
1023 }
1024
1025 /* disable the unused connectors while restoring the modesetting */
1026 __drm_helper_disable_unused_functions(dev);
1027 drm_modeset_unlock_all(dev);
1028}
1029EXPORT_SYMBOL(drm_helper_resume_force_mode);
1030
1031/**
1032 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs
1033 * @dev: DRM device whose CRTCs to turn off
1034 *
1035 * Drivers may want to call this on unload to ensure that all displays are
1036 * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
1037 *
1038 * Note: This should only be used by non-atomic legacy drivers. For an atomic
1039 * version look at drm_atomic_helper_shutdown().
1040 *
1041 * Returns:
1042 * Zero on success, error code on failure.
1043 */
1044int drm_helper_force_disable_all(struct drm_device *dev)
1045{
1046 struct drm_crtc *crtc;
1047 int ret = 0;
1048
1049 drm_modeset_lock_all(dev);
1050 drm_for_each_crtc(crtc, dev)
1051 if (crtc->enabled) {
1052 struct drm_mode_set set = {
1053 .crtc = crtc,
1054 };
1055
1056 ret = drm_mode_set_config_internal(set: &set);
1057 if (ret)
1058 goto out;
1059 }
1060out:
1061 drm_modeset_unlock_all(dev);
1062 return ret;
1063}
1064EXPORT_SYMBOL(drm_helper_force_disable_all);
1065