Loading...
1/*
2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
4 *
5 * DRM core CRTC related functions
6 *
7 * Permission to use, copy, modify, distribute, and sell this software and its
8 * documentation for any purpose is hereby granted without fee, provided that
9 * the above copyright notice appear in all copies and that both that copyright
10 * notice and this permission notice appear in supporting documentation, and
11 * that the name of the copyright holders not be used in advertising or
12 * publicity pertaining to distribution of the software without specific,
13 * written prior permission. The copyright holders make no representations
14 * about the suitability of this software for any purpose. It is provided "as
15 * is" without express or implied warranty.
16 *
17 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
19 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
21 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
22 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 * OF THIS SOFTWARE.
24 *
25 * Authors:
26 * Keith Packard
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
30 */
31
32#include <linux/export.h>
33#include <linux/kernel.h>
34#include <linux/moduleparam.h>
35
36#include <drm/drm_atomic.h>
37#include <drm/drm_atomic_helper.h>
38#include <drm/drm_atomic_uapi.h>
39#include <drm/drm_bridge.h>
40#include <drm/drm_crtc.h>
41#include <drm/drm_crtc_helper.h>
42#include <drm/drm_drv.h>
43#include <drm/drm_edid.h>
44#include <drm/drm_encoder.h>
45#include <drm/drm_fb_helper.h>
46#include <drm/drm_fourcc.h>
47#include <drm/drm_plane_helper.h>
48#include <drm/drm_print.h>
49#include <drm/drm_vblank.h>
50
51#include "drm_crtc_helper_internal.h"
52
53/**
54 * DOC: overview
55 *
56 * The CRTC modeset helper library provides a default set_config implementation
57 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
58 * the same callbacks which drivers can use to e.g. restore the modeset
59 * configuration on resume with drm_helper_resume_force_mode().
60 *
61 * Note that this helper library doesn't track the current power state of CRTCs
62 * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even
63 * though the hardware is already in the desired state. This deficiency has been
64 * fixed in the atomic helpers.
65 *
66 * The driver callbacks are mostly compatible with the atomic modeset helpers,
67 * except for the handling of the primary plane: Atomic helpers require that the
68 * primary plane is implemented as a real standalone plane and not directly tied
69 * to the CRTC state. For easier transition this library provides functions to
70 * implement the old semantics required by the CRTC helpers using the new plane
71 * and atomic helper callbacks.
72 *
73 * Drivers are strongly urged to convert to the atomic helpers (by way of first
74 * converting to the plane helpers). New drivers must not use these functions
75 * but need to implement the atomic interface instead, potentially using the
76 * atomic helpers for that.
77 *
78 * These legacy modeset helpers use the same function table structures as
79 * all other modesetting helpers. See the documentation for struct
80 * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct
81 * &drm_connector_helper_funcs.
82 */
83
84/**
85 * drm_helper_encoder_in_use - check if a given encoder is in use
86 * @encoder: encoder to check
87 *
88 * Checks whether @encoder is with the current mode setting output configuration
89 * in use by any connector. This doesn't mean that it is actually enabled since
90 * the DPMS state is tracked separately.
91 *
92 * Returns:
93 * True if @encoder is used, false otherwise.
94 */
95bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
96{
97 struct drm_connector *connector;
98 struct drm_connector_list_iter conn_iter;
99 struct drm_device *dev = encoder->dev;
100
101 WARN_ON(drm_drv_uses_atomic_modeset(dev));
102
103 /*
104 * We can expect this mutex to be locked if we are not panicking.
105 * Locking is currently fubar in the panic handler.
106 */
107 if (!oops_in_progress) {
108 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
109 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
110 }
111
112
113 drm_connector_list_iter_begin(dev, &conn_iter);
114 drm_for_each_connector_iter(connector, &conn_iter) {
115 if (connector->encoder == encoder) {
116 drm_connector_list_iter_end(&conn_iter);
117 return true;
118 }
119 }
120 drm_connector_list_iter_end(&conn_iter);
121 return false;
122}
123EXPORT_SYMBOL(drm_helper_encoder_in_use);
124
125/**
126 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
127 * @crtc: CRTC to check
128 *
129 * Checks whether @crtc is with the current mode setting output configuration
130 * in use by any connector. This doesn't mean that it is actually enabled since
131 * the DPMS state is tracked separately.
132 *
133 * Returns:
134 * True if @crtc is used, false otherwise.
135 */
136bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
137{
138 struct drm_encoder *encoder;
139 struct drm_device *dev = crtc->dev;
140
141 WARN_ON(drm_drv_uses_atomic_modeset(dev));
142
143 /*
144 * We can expect this mutex to be locked if we are not panicking.
145 * Locking is currently fubar in the panic handler.
146 */
147 if (!oops_in_progress)
148 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
149
150 drm_for_each_encoder(encoder, dev)
151 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
152 return true;
153 return false;
154}
155EXPORT_SYMBOL(drm_helper_crtc_in_use);
156
157static void
158drm_encoder_disable(struct drm_encoder *encoder)
159{
160 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
161
162 if (!encoder_funcs)
163 return;
164
165 if (encoder_funcs->disable)
166 (*encoder_funcs->disable)(encoder);
167 else if (encoder_funcs->dpms)
168 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
169}
170
171static void __drm_helper_disable_unused_functions(struct drm_device *dev)
172{
173 struct drm_encoder *encoder;
174 struct drm_crtc *crtc;
175
176 drm_warn_on_modeset_not_all_locked(dev);
177
178 drm_for_each_encoder(encoder, dev) {
179 if (!drm_helper_encoder_in_use(encoder)) {
180 drm_encoder_disable(encoder);
181 /* disconnect encoder from any connector */
182 encoder->crtc = NULL;
183 }
184 }
185
186 drm_for_each_crtc(crtc, dev) {
187 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
188
189 crtc->enabled = drm_helper_crtc_in_use(crtc);
190 if (!crtc->enabled) {
191 if (crtc_funcs->disable)
192 (*crtc_funcs->disable)(crtc);
193 else
194 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
195 crtc->primary->fb = NULL;
196 }
197 }
198}
199
200/**
201 * drm_helper_disable_unused_functions - disable unused objects
202 * @dev: DRM device
203 *
204 * This function walks through the entire mode setting configuration of @dev. It
205 * will remove any CRTC links of unused encoders and encoder links of
206 * disconnected connectors. Then it will disable all unused encoders and CRTCs
207 * either by calling their disable callback if available or by calling their
208 * dpms callback with DRM_MODE_DPMS_OFF.
209 *
210 * NOTE:
211 *
212 * This function is part of the legacy modeset helper library and will cause
213 * major confusion with atomic drivers. This is because atomic helpers guarantee
214 * to never call ->disable() hooks on a disabled function, or ->enable() hooks
215 * on an enabled functions. drm_helper_disable_unused_functions() on the other
216 * hand throws such guarantees into the wind and calls disable hooks
217 * unconditionally on unused functions.
218 */
219void drm_helper_disable_unused_functions(struct drm_device *dev)
220{
221 WARN_ON(drm_drv_uses_atomic_modeset(dev));
222
223 drm_modeset_lock_all(dev);
224 __drm_helper_disable_unused_functions(dev);
225 drm_modeset_unlock_all(dev);
226}
227EXPORT_SYMBOL(drm_helper_disable_unused_functions);
228
229/*
230 * Check the CRTC we're going to map each output to vs. its current
231 * CRTC. If they don't match, we have to disable the output and the CRTC
232 * since the driver will have to re-route things.
233 */
234static void
235drm_crtc_prepare_encoders(struct drm_device *dev)
236{
237 const struct drm_encoder_helper_funcs *encoder_funcs;
238 struct drm_encoder *encoder;
239
240 drm_for_each_encoder(encoder, dev) {
241 encoder_funcs = encoder->helper_private;
242 if (!encoder_funcs)
243 continue;
244
245 /* Disable unused encoders */
246 if (encoder->crtc == NULL)
247 drm_encoder_disable(encoder);
248 }
249}
250
251/**
252 * drm_crtc_helper_set_mode - internal helper to set a mode
253 * @crtc: CRTC to program
254 * @mode: mode to use
255 * @x: horizontal offset into the surface
256 * @y: vertical offset into the surface
257 * @old_fb: old framebuffer, for cleanup
258 *
259 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
260 * to fixup or reject the mode prior to trying to set it. This is an internal
261 * helper that drivers could e.g. use to update properties that require the
262 * entire output pipe to be disabled and re-enabled in a new configuration. For
263 * example for changing whether audio is enabled on a hdmi link or for changing
264 * panel fitter or dither attributes. It is also called by the
265 * drm_crtc_helper_set_config() helper function to drive the mode setting
266 * sequence.
267 *
268 * Returns:
269 * True if the mode was set successfully, false otherwise.
270 */
271bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
272 struct drm_display_mode *mode,
273 int x, int y,
274 struct drm_framebuffer *old_fb)
275{
276 struct drm_device *dev = crtc->dev;
277 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
278 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
279 const struct drm_encoder_helper_funcs *encoder_funcs;
280 int saved_x, saved_y;
281 bool saved_enabled;
282 struct drm_encoder *encoder;
283 bool ret = true;
284
285 WARN_ON(drm_drv_uses_atomic_modeset(dev));
286
287 drm_warn_on_modeset_not_all_locked(dev);
288
289 saved_enabled = crtc->enabled;
290 crtc->enabled = drm_helper_crtc_in_use(crtc);
291 if (!crtc->enabled)
292 return true;
293
294 adjusted_mode = drm_mode_duplicate(dev, mode);
295 if (!adjusted_mode) {
296 crtc->enabled = saved_enabled;
297 return false;
298 }
299
300 saved_mode = crtc->mode;
301 saved_hwmode = crtc->hwmode;
302 saved_x = crtc->x;
303 saved_y = crtc->y;
304
305 /* Update crtc values up front so the driver can rely on them for mode
306 * setting.
307 */
308 crtc->mode = *mode;
309 crtc->x = x;
310 crtc->y = y;
311
312 /* Pass our mode to the connectors and the CRTC to give them a chance to
313 * adjust it according to limitations or connector properties, and also
314 * a chance to reject the mode entirely.
315 */
316 drm_for_each_encoder(encoder, dev) {
317
318 if (encoder->crtc != crtc)
319 continue;
320
321 encoder_funcs = encoder->helper_private;
322 if (!encoder_funcs)
323 continue;
324
325 encoder_funcs = encoder->helper_private;
326 if (encoder_funcs->mode_fixup) {
327 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
328 adjusted_mode))) {
329 DRM_DEBUG_KMS("Encoder fixup failed\n");
330 goto done;
331 }
332 }
333 }
334
335 if (crtc_funcs->mode_fixup) {
336 if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
337 adjusted_mode))) {
338 DRM_DEBUG_KMS("CRTC fixup failed\n");
339 goto done;
340 }
341 }
342 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
343
344 crtc->hwmode = *adjusted_mode;
345
346 /* Prepare the encoders and CRTCs before setting the mode. */
347 drm_for_each_encoder(encoder, dev) {
348
349 if (encoder->crtc != crtc)
350 continue;
351
352 encoder_funcs = encoder->helper_private;
353 if (!encoder_funcs)
354 continue;
355
356 /* Disable the encoders as the first thing we do. */
357 if (encoder_funcs->prepare)
358 encoder_funcs->prepare(encoder);
359 }
360
361 drm_crtc_prepare_encoders(dev);
362
363 crtc_funcs->prepare(crtc);
364
365 /* Set up the DPLL and any encoders state that needs to adjust or depend
366 * on the DPLL.
367 */
368 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
369 if (!ret)
370 goto done;
371
372 drm_for_each_encoder(encoder, dev) {
373
374 if (encoder->crtc != crtc)
375 continue;
376
377 encoder_funcs = encoder->helper_private;
378 if (!encoder_funcs)
379 continue;
380
381 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%s]\n",
382 encoder->base.id, encoder->name, mode->name);
383 if (encoder_funcs->mode_set)
384 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
385 }
386
387 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
388 crtc_funcs->commit(crtc);
389
390 drm_for_each_encoder(encoder, dev) {
391
392 if (encoder->crtc != crtc)
393 continue;
394
395 encoder_funcs = encoder->helper_private;
396 if (!encoder_funcs)
397 continue;
398
399 if (encoder_funcs->commit)
400 encoder_funcs->commit(encoder);
401 }
402
403 /* Calculate and store various constants which
404 * are later needed by vblank and swap-completion
405 * timestamping. They are derived from true hwmode.
406 */
407 drm_calc_timestamping_constants(crtc, &crtc->hwmode);
408
409 /* FIXME: add subpixel order */
410done:
411 drm_mode_destroy(dev, adjusted_mode);
412 if (!ret) {
413 crtc->enabled = saved_enabled;
414 crtc->mode = saved_mode;
415 crtc->hwmode = saved_hwmode;
416 crtc->x = saved_x;
417 crtc->y = saved_y;
418 }
419
420 return ret;
421}
422EXPORT_SYMBOL(drm_crtc_helper_set_mode);
423
424static void
425drm_crtc_helper_disable(struct drm_crtc *crtc)
426{
427 struct drm_device *dev = crtc->dev;
428 struct drm_connector *connector;
429 struct drm_encoder *encoder;
430
431 /* Decouple all encoders and their attached connectors from this crtc */
432 drm_for_each_encoder(encoder, dev) {
433 struct drm_connector_list_iter conn_iter;
434
435 if (encoder->crtc != crtc)
436 continue;
437
438 drm_connector_list_iter_begin(dev, &conn_iter);
439 drm_for_each_connector_iter(connector, &conn_iter) {
440 if (connector->encoder != encoder)
441 continue;
442
443 connector->encoder = NULL;
444
445 /*
446 * drm_helper_disable_unused_functions() ought to be
447 * doing this, but since we've decoupled the encoder
448 * from the connector above, the required connection
449 * between them is henceforth no longer available.
450 */
451 connector->dpms = DRM_MODE_DPMS_OFF;
452
453 /* we keep a reference while the encoder is bound */
454 drm_connector_put(connector);
455 }
456 drm_connector_list_iter_end(&conn_iter);
457 }
458
459 __drm_helper_disable_unused_functions(dev);
460}
461
462/*
463 * For connectors that support multiple encoders, either the
464 * .atomic_best_encoder() or .best_encoder() operation must be implemented.
465 */
466struct drm_encoder *
467drm_connector_get_single_encoder(struct drm_connector *connector)
468{
469 struct drm_encoder *encoder;
470
471 WARN_ON(hweight32(connector->possible_encoders) > 1);
472 drm_connector_for_each_possible_encoder(connector, encoder)
473 return encoder;
474
475 return NULL;
476}
477
478/**
479 * drm_crtc_helper_set_config - set a new config from userspace
480 * @set: mode set configuration
481 * @ctx: lock acquire context, not used here
482 *
483 * The drm_crtc_helper_set_config() helper function implements the of
484 * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
485 * helpers.
486 *
487 * It first tries to locate the best encoder for each connector by calling the
488 * connector @drm_connector_helper_funcs.best_encoder helper operation.
489 *
490 * After locating the appropriate encoders, the helper function will call the
491 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
492 * or reject it completely in which case an error will be returned to the
493 * application. If the new configuration after mode adjustment is identical to
494 * the current configuration the helper function will return without performing
495 * any other operation.
496 *
497 * If the adjusted mode is identical to the current mode but changes to the
498 * frame buffer need to be applied, the drm_crtc_helper_set_config() function
499 * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
500 *
501 * If the adjusted mode differs from the current mode, or if the
502 * ->mode_set_base() helper operation is not provided, the helper function
503 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
504 * and ->commit() CRTC and encoder helper operations, in that order.
505 * Alternatively it can also use the dpms and disable helper operations. For
506 * details see &struct drm_crtc_helper_funcs and struct
507 * &drm_encoder_helper_funcs.
508 *
509 * This function is deprecated. New drivers must implement atomic modeset
510 * support, for which this function is unsuitable. Instead drivers should use
511 * drm_atomic_helper_set_config().
512 *
513 * Returns:
514 * Returns 0 on success, negative errno numbers on failure.
515 */
516int drm_crtc_helper_set_config(struct drm_mode_set *set,
517 struct drm_modeset_acquire_ctx *ctx)
518{
519 struct drm_device *dev;
520 struct drm_crtc **save_encoder_crtcs, *new_crtc;
521 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
522 bool mode_changed = false; /* if true do a full mode set */
523 bool fb_changed = false; /* if true and !mode_changed just do a flip */
524 struct drm_connector *connector;
525 struct drm_connector_list_iter conn_iter;
526 int count = 0, ro, fail = 0;
527 const struct drm_crtc_helper_funcs *crtc_funcs;
528 struct drm_mode_set save_set;
529 int ret;
530 int i;
531
532 DRM_DEBUG_KMS("\n");
533
534 BUG_ON(!set);
535 BUG_ON(!set->crtc);
536 BUG_ON(!set->crtc->helper_private);
537
538 /* Enforce sane interface api - has been abused by the fb helper. */
539 BUG_ON(!set->mode && set->fb);
540 BUG_ON(set->fb && set->num_connectors == 0);
541
542 crtc_funcs = set->crtc->helper_private;
543
544 dev = set->crtc->dev;
545 WARN_ON(drm_drv_uses_atomic_modeset(dev));
546
547 if (!set->mode)
548 set->fb = NULL;
549
550 if (set->fb) {
551 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
552 set->crtc->base.id, set->crtc->name,
553 set->fb->base.id,
554 (int)set->num_connectors, set->x, set->y);
555 } else {
556 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
557 set->crtc->base.id, set->crtc->name);
558 drm_crtc_helper_disable(set->crtc);
559 return 0;
560 }
561
562 drm_warn_on_modeset_not_all_locked(dev);
563
564 /*
565 * Allocate space for the backup of all (non-pointer) encoder and
566 * connector data.
567 */
568 save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder,
569 sizeof(struct drm_crtc *), GFP_KERNEL);
570 if (!save_encoder_crtcs)
571 return -ENOMEM;
572
573 save_connector_encoders = kcalloc(dev->mode_config.num_connector,
574 sizeof(struct drm_encoder *), GFP_KERNEL);
575 if (!save_connector_encoders) {
576 kfree(save_encoder_crtcs);
577 return -ENOMEM;
578 }
579
580 /*
581 * Copy data. Note that driver private data is not affected.
582 * Should anything bad happen only the expected state is
583 * restored, not the drivers personal bookkeeping.
584 */
585 count = 0;
586 drm_for_each_encoder(encoder, dev) {
587 save_encoder_crtcs[count++] = encoder->crtc;
588 }
589
590 count = 0;
591 drm_connector_list_iter_begin(dev, &conn_iter);
592 drm_for_each_connector_iter(connector, &conn_iter)
593 save_connector_encoders[count++] = connector->encoder;
594 drm_connector_list_iter_end(&conn_iter);
595
596 save_set.crtc = set->crtc;
597 save_set.mode = &set->crtc->mode;
598 save_set.x = set->crtc->x;
599 save_set.y = set->crtc->y;
600 save_set.fb = set->crtc->primary->fb;
601
602 /* We should be able to check here if the fb has the same properties
603 * and then just flip_or_move it */
604 if (set->crtc->primary->fb != set->fb) {
605 /* If we have no fb then treat it as a full mode set */
606 if (set->crtc->primary->fb == NULL) {
607 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
608 mode_changed = true;
609 } else if (set->fb->format != set->crtc->primary->fb->format) {
610 mode_changed = true;
611 } else
612 fb_changed = true;
613 }
614
615 if (set->x != set->crtc->x || set->y != set->crtc->y)
616 fb_changed = true;
617
618 if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
619 DRM_DEBUG_KMS("modes are different, full mode set\n");
620 drm_mode_debug_printmodeline(&set->crtc->mode);
621 drm_mode_debug_printmodeline(set->mode);
622 mode_changed = true;
623 }
624
625 /* take a reference on all unbound connectors in set, reuse the
626 * already taken reference for bound connectors
627 */
628 for (ro = 0; ro < set->num_connectors; ro++) {
629 if (set->connectors[ro]->encoder)
630 continue;
631 drm_connector_get(set->connectors[ro]);
632 }
633
634 /* a) traverse passed in connector list and get encoders for them */
635 count = 0;
636 drm_connector_list_iter_begin(dev, &conn_iter);
637 drm_for_each_connector_iter(connector, &conn_iter) {
638 const struct drm_connector_helper_funcs *connector_funcs =
639 connector->helper_private;
640 new_encoder = connector->encoder;
641 for (ro = 0; ro < set->num_connectors; ro++) {
642 if (set->connectors[ro] == connector) {
643 if (connector_funcs->best_encoder)
644 new_encoder = connector_funcs->best_encoder(connector);
645 else
646 new_encoder = drm_connector_get_single_encoder(connector);
647
648 /* if we can't get an encoder for a connector
649 we are setting now - then fail */
650 if (new_encoder == NULL)
651 /* don't break so fail path works correct */
652 fail = 1;
653
654 if (connector->dpms != DRM_MODE_DPMS_ON) {
655 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
656 mode_changed = true;
657 }
658
659 break;
660 }
661 }
662
663 if (new_encoder != connector->encoder) {
664 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
665 mode_changed = true;
666 /* If the encoder is reused for another connector, then
667 * the appropriate crtc will be set later.
668 */
669 if (connector->encoder)
670 connector->encoder->crtc = NULL;
671 connector->encoder = new_encoder;
672 }
673 }
674 drm_connector_list_iter_end(&conn_iter);
675
676 if (fail) {
677 ret = -EINVAL;
678 goto fail;
679 }
680
681 count = 0;
682 drm_connector_list_iter_begin(dev, &conn_iter);
683 drm_for_each_connector_iter(connector, &conn_iter) {
684 if (!connector->encoder)
685 continue;
686
687 if (connector->encoder->crtc == set->crtc)
688 new_crtc = NULL;
689 else
690 new_crtc = connector->encoder->crtc;
691
692 for (ro = 0; ro < set->num_connectors; ro++) {
693 if (set->connectors[ro] == connector)
694 new_crtc = set->crtc;
695 }
696
697 /* Make sure the new CRTC will work with the encoder */
698 if (new_crtc &&
699 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
700 ret = -EINVAL;
701 drm_connector_list_iter_end(&conn_iter);
702 goto fail;
703 }
704 if (new_crtc != connector->encoder->crtc) {
705 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
706 mode_changed = true;
707 connector->encoder->crtc = new_crtc;
708 }
709 if (new_crtc) {
710 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
711 connector->base.id, connector->name,
712 new_crtc->base.id, new_crtc->name);
713 } else {
714 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
715 connector->base.id, connector->name);
716 }
717 }
718 drm_connector_list_iter_end(&conn_iter);
719
720 /* mode_set_base is not a required function */
721 if (fb_changed && !crtc_funcs->mode_set_base)
722 mode_changed = true;
723
724 if (mode_changed) {
725 if (drm_helper_crtc_in_use(set->crtc)) {
726 DRM_DEBUG_KMS("attempting to set mode from"
727 " userspace\n");
728 drm_mode_debug_printmodeline(set->mode);
729 set->crtc->primary->fb = set->fb;
730 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
731 set->x, set->y,
732 save_set.fb)) {
733 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
734 set->crtc->base.id, set->crtc->name);
735 set->crtc->primary->fb = save_set.fb;
736 ret = -EINVAL;
737 goto fail;
738 }
739 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
740 for (i = 0; i < set->num_connectors; i++) {
741 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
742 set->connectors[i]->name);
743 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
744 }
745 }
746 __drm_helper_disable_unused_functions(dev);
747 } else if (fb_changed) {
748 set->crtc->x = set->x;
749 set->crtc->y = set->y;
750 set->crtc->primary->fb = set->fb;
751 ret = crtc_funcs->mode_set_base(set->crtc,
752 set->x, set->y, save_set.fb);
753 if (ret != 0) {
754 set->crtc->x = save_set.x;
755 set->crtc->y = save_set.y;
756 set->crtc->primary->fb = save_set.fb;
757 goto fail;
758 }
759 }
760
761 kfree(save_connector_encoders);
762 kfree(save_encoder_crtcs);
763 return 0;
764
765fail:
766 /* Restore all previous data. */
767 count = 0;
768 drm_for_each_encoder(encoder, dev) {
769 encoder->crtc = save_encoder_crtcs[count++];
770 }
771
772 count = 0;
773 drm_connector_list_iter_begin(dev, &conn_iter);
774 drm_for_each_connector_iter(connector, &conn_iter)
775 connector->encoder = save_connector_encoders[count++];
776 drm_connector_list_iter_end(&conn_iter);
777
778 /* after fail drop reference on all unbound connectors in set, let
779 * bound connectors keep their reference
780 */
781 for (ro = 0; ro < set->num_connectors; ro++) {
782 if (set->connectors[ro]->encoder)
783 continue;
784 drm_connector_put(set->connectors[ro]);
785 }
786
787 /* Try to restore the config */
788 if (mode_changed &&
789 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
790 save_set.y, save_set.fb))
791 DRM_ERROR("failed to restore config after modeset failure\n");
792
793 kfree(save_connector_encoders);
794 kfree(save_encoder_crtcs);
795 return ret;
796}
797EXPORT_SYMBOL(drm_crtc_helper_set_config);
798
799static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
800{
801 int dpms = DRM_MODE_DPMS_OFF;
802 struct drm_connector *connector;
803 struct drm_connector_list_iter conn_iter;
804 struct drm_device *dev = encoder->dev;
805
806 drm_connector_list_iter_begin(dev, &conn_iter);
807 drm_for_each_connector_iter(connector, &conn_iter)
808 if (connector->encoder == encoder)
809 if (connector->dpms < dpms)
810 dpms = connector->dpms;
811 drm_connector_list_iter_end(&conn_iter);
812
813 return dpms;
814}
815
816/* Helper which handles bridge ordering around encoder dpms */
817static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
818{
819 const struct drm_encoder_helper_funcs *encoder_funcs;
820
821 encoder_funcs = encoder->helper_private;
822 if (!encoder_funcs)
823 return;
824
825 if (encoder_funcs->dpms)
826 encoder_funcs->dpms(encoder, mode);
827}
828
829static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
830{
831 int dpms = DRM_MODE_DPMS_OFF;
832 struct drm_connector *connector;
833 struct drm_connector_list_iter conn_iter;
834 struct drm_device *dev = crtc->dev;
835
836 drm_connector_list_iter_begin(dev, &conn_iter);
837 drm_for_each_connector_iter(connector, &conn_iter)
838 if (connector->encoder && connector->encoder->crtc == crtc)
839 if (connector->dpms < dpms)
840 dpms = connector->dpms;
841 drm_connector_list_iter_end(&conn_iter);
842
843 return dpms;
844}
845
846/**
847 * drm_helper_connector_dpms() - connector dpms helper implementation
848 * @connector: affected connector
849 * @mode: DPMS mode
850 *
851 * The drm_helper_connector_dpms() helper function implements the
852 * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
853 * helpers.
854 *
855 * This is the main helper function provided by the CRTC helper framework for
856 * implementing the DPMS connector attribute. It computes the new desired DPMS
857 * state for all encoders and CRTCs in the output mesh and calls the
858 * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
859 * provided by the driver.
860 *
861 * This function is deprecated. New drivers must implement atomic modeset
862 * support, where DPMS is handled in the DRM core.
863 *
864 * Returns:
865 * Always returns 0.
866 */
867int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
868{
869 struct drm_encoder *encoder = connector->encoder;
870 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
871 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
872
873 WARN_ON(drm_drv_uses_atomic_modeset(connector->dev));
874
875 if (mode == connector->dpms)
876 return 0;
877
878 old_dpms = connector->dpms;
879 connector->dpms = mode;
880
881 if (encoder)
882 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
883
884 /* from off to on, do crtc then encoder */
885 if (mode < old_dpms) {
886 if (crtc) {
887 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
888
889 if (crtc_funcs->dpms)
890 (*crtc_funcs->dpms) (crtc,
891 drm_helper_choose_crtc_dpms(crtc));
892 }
893 if (encoder)
894 drm_helper_encoder_dpms(encoder, encoder_dpms);
895 }
896
897 /* from on to off, do encoder then crtc */
898 if (mode > old_dpms) {
899 if (encoder)
900 drm_helper_encoder_dpms(encoder, encoder_dpms);
901 if (crtc) {
902 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
903
904 if (crtc_funcs->dpms)
905 (*crtc_funcs->dpms) (crtc,
906 drm_helper_choose_crtc_dpms(crtc));
907 }
908 }
909
910 return 0;
911}
912EXPORT_SYMBOL(drm_helper_connector_dpms);
913
914/**
915 * drm_helper_resume_force_mode - force-restore mode setting configuration
916 * @dev: drm_device which should be restored
917 *
918 * Drivers which use the mode setting helpers can use this function to
919 * force-restore the mode setting configuration e.g. on resume or when something
920 * else might have trampled over the hw state (like some overzealous old BIOSen
921 * tended to do).
922 *
923 * This helper doesn't provide a error return value since restoring the old
924 * config should never fail due to resource allocation issues since the driver
925 * has successfully set the restored configuration already. Hence this should
926 * boil down to the equivalent of a few dpms on calls, which also don't provide
927 * an error code.
928 *
929 * Drivers where simply restoring an old configuration again might fail (e.g.
930 * due to slight differences in allocating shared resources when the
931 * configuration is restored in a different order than when userspace set it up)
932 * need to use their own restore logic.
933 *
934 * This function is deprecated. New drivers should implement atomic mode-
935 * setting and use the atomic suspend/resume helpers.
936 *
937 * See also:
938 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
939 */
940void drm_helper_resume_force_mode(struct drm_device *dev)
941{
942 struct drm_crtc *crtc;
943 struct drm_encoder *encoder;
944 const struct drm_crtc_helper_funcs *crtc_funcs;
945 int encoder_dpms;
946 bool ret;
947
948 WARN_ON(drm_drv_uses_atomic_modeset(dev));
949
950 drm_modeset_lock_all(dev);
951 drm_for_each_crtc(crtc, dev) {
952
953 if (!crtc->enabled)
954 continue;
955
956 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
957 crtc->x, crtc->y, crtc->primary->fb);
958
959 /* Restoring the old config should never fail! */
960 if (ret == false)
961 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
962
963 /* Turn off outputs that were already powered off */
964 if (drm_helper_choose_crtc_dpms(crtc)) {
965 drm_for_each_encoder(encoder, dev) {
966
967 if(encoder->crtc != crtc)
968 continue;
969
970 encoder_dpms = drm_helper_choose_encoder_dpms(
971 encoder);
972
973 drm_helper_encoder_dpms(encoder, encoder_dpms);
974 }
975
976 crtc_funcs = crtc->helper_private;
977 if (crtc_funcs->dpms)
978 (*crtc_funcs->dpms) (crtc,
979 drm_helper_choose_crtc_dpms(crtc));
980 }
981 }
982
983 /* disable the unused connectors while restoring the modesetting */
984 __drm_helper_disable_unused_functions(dev);
985 drm_modeset_unlock_all(dev);
986}
987EXPORT_SYMBOL(drm_helper_resume_force_mode);
988
989/**
990 * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs
991 * @dev: DRM device whose CRTCs to turn off
992 *
993 * Drivers may want to call this on unload to ensure that all displays are
994 * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
995 *
996 * Note: This should only be used by non-atomic legacy drivers. For an atomic
997 * version look at drm_atomic_helper_shutdown().
998 *
999 * Returns:
1000 * Zero on success, error code on failure.
1001 */
1002int drm_helper_force_disable_all(struct drm_device *dev)
1003{
1004 struct drm_crtc *crtc;
1005 int ret = 0;
1006
1007 drm_modeset_lock_all(dev);
1008 drm_for_each_crtc(crtc, dev)
1009 if (crtc->enabled) {
1010 struct drm_mode_set set = {
1011 .crtc = crtc,
1012 };
1013
1014 ret = drm_mode_set_config_internal(&set);
1015 if (ret)
1016 goto out;
1017 }
1018out:
1019 drm_modeset_unlock_all(dev);
1020 return ret;
1021}
1022EXPORT_SYMBOL(drm_helper_force_disable_all);
1/*
2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
4 *
5 * DRM core CRTC related functions
6 *
7 * Permission to use, copy, modify, distribute, and sell this software and its
8 * documentation for any purpose is hereby granted without fee, provided that
9 * the above copyright notice appear in all copies and that both that copyright
10 * notice and this permission notice appear in supporting documentation, and
11 * that the name of the copyright holders not be used in advertising or
12 * publicity pertaining to distribution of the software without specific,
13 * written prior permission. The copyright holders make no representations
14 * about the suitability of this software for any purpose. It is provided "as
15 * is" without express or implied warranty.
16 *
17 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
19 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
21 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
22 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 * OF THIS SOFTWARE.
24 *
25 * Authors:
26 * Keith Packard
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
30 */
31
32#include <linux/kernel.h>
33#include <linux/export.h>
34#include <linux/moduleparam.h>
35
36#include <drm/drmP.h>
37#include <drm/drm_atomic.h>
38#include <drm/drm_crtc.h>
39#include <drm/drm_fourcc.h>
40#include <drm/drm_crtc_helper.h>
41#include <drm/drm_fb_helper.h>
42#include <drm/drm_plane_helper.h>
43#include <drm/drm_atomic_helper.h>
44#include <drm/drm_edid.h>
45
46/**
47 * DOC: overview
48 *
49 * The CRTC modeset helper library provides a default set_config implementation
50 * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
51 * the same callbacks which drivers can use to e.g. restore the modeset
52 * configuration on resume with drm_helper_resume_force_mode().
53 *
54 * Note that this helper library doesn't track the current power state of CRTCs
55 * and encoders. It can call callbacks like ->dpms() even though the hardware is
56 * already in the desired state. This deficiency has been fixed in the atomic
57 * helpers.
58 *
59 * The driver callbacks are mostly compatible with the atomic modeset helpers,
60 * except for the handling of the primary plane: Atomic helpers require that the
61 * primary plane is implemented as a real standalone plane and not directly tied
62 * to the CRTC state. For easier transition this library provides functions to
63 * implement the old semantics required by the CRTC helpers using the new plane
64 * and atomic helper callbacks.
65 *
66 * Drivers are strongly urged to convert to the atomic helpers (by way of first
67 * converting to the plane helpers). New drivers must not use these functions
68 * but need to implement the atomic interface instead, potentially using the
69 * atomic helpers for that.
70 *
71 * These legacy modeset helpers use the same function table structures as
72 * all other modesetting helpers. See the documentation for struct
73 * &drm_crtc_helper_funcs, struct &drm_encoder_helper_funcs and struct
74 * &drm_connector_helper_funcs.
75 */
76
77/**
78 * drm_helper_encoder_in_use - check if a given encoder is in use
79 * @encoder: encoder to check
80 *
81 * Checks whether @encoder is with the current mode setting output configuration
82 * in use by any connector. This doesn't mean that it is actually enabled since
83 * the DPMS state is tracked separately.
84 *
85 * Returns:
86 * True if @encoder is used, false otherwise.
87 */
88bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
89{
90 struct drm_connector *connector;
91 struct drm_device *dev = encoder->dev;
92
93 /*
94 * We can expect this mutex to be locked if we are not panicking.
95 * Locking is currently fubar in the panic handler.
96 */
97 if (!oops_in_progress) {
98 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
99 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
100 }
101
102 drm_for_each_connector(connector, dev)
103 if (connector->encoder == encoder)
104 return true;
105 return false;
106}
107EXPORT_SYMBOL(drm_helper_encoder_in_use);
108
109/**
110 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
111 * @crtc: CRTC to check
112 *
113 * Checks whether @crtc is with the current mode setting output configuration
114 * in use by any connector. This doesn't mean that it is actually enabled since
115 * the DPMS state is tracked separately.
116 *
117 * Returns:
118 * True if @crtc is used, false otherwise.
119 */
120bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
121{
122 struct drm_encoder *encoder;
123 struct drm_device *dev = crtc->dev;
124
125 /*
126 * We can expect this mutex to be locked if we are not panicking.
127 * Locking is currently fubar in the panic handler.
128 */
129 if (!oops_in_progress)
130 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
131
132 drm_for_each_encoder(encoder, dev)
133 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
134 return true;
135 return false;
136}
137EXPORT_SYMBOL(drm_helper_crtc_in_use);
138
139static void
140drm_encoder_disable(struct drm_encoder *encoder)
141{
142 const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
143
144 if (!encoder_funcs)
145 return;
146
147 drm_bridge_disable(encoder->bridge);
148
149 if (encoder_funcs->disable)
150 (*encoder_funcs->disable)(encoder);
151 else if (encoder_funcs->dpms)
152 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
153
154 drm_bridge_post_disable(encoder->bridge);
155}
156
157static void __drm_helper_disable_unused_functions(struct drm_device *dev)
158{
159 struct drm_encoder *encoder;
160 struct drm_crtc *crtc;
161
162 drm_warn_on_modeset_not_all_locked(dev);
163
164 drm_for_each_encoder(encoder, dev) {
165 if (!drm_helper_encoder_in_use(encoder)) {
166 drm_encoder_disable(encoder);
167 /* disconnect encoder from any connector */
168 encoder->crtc = NULL;
169 }
170 }
171
172 drm_for_each_crtc(crtc, dev) {
173 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
174 crtc->enabled = drm_helper_crtc_in_use(crtc);
175 if (!crtc->enabled) {
176 if (crtc_funcs->disable)
177 (*crtc_funcs->disable)(crtc);
178 else
179 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
180 crtc->primary->fb = NULL;
181 }
182 }
183}
184
185/**
186 * drm_helper_disable_unused_functions - disable unused objects
187 * @dev: DRM device
188 *
189 * This function walks through the entire mode setting configuration of @dev. It
190 * will remove any CRTC links of unused encoders and encoder links of
191 * disconnected connectors. Then it will disable all unused encoders and CRTCs
192 * either by calling their disable callback if available or by calling their
193 * dpms callback with DRM_MODE_DPMS_OFF.
194 *
195 * NOTE:
196 *
197 * This function is part of the legacy modeset helper library and will cause
198 * major confusion with atomic drivers. This is because atomic helpers guarantee
199 * to never call ->disable() hooks on a disabled function, or ->enable() hooks
200 * on an enabled functions. drm_helper_disable_unused_functions() on the other
201 * hand throws such guarantees into the wind and calls disable hooks
202 * unconditionally on unused functions.
203 */
204void drm_helper_disable_unused_functions(struct drm_device *dev)
205{
206 if (drm_core_check_feature(dev, DRIVER_ATOMIC))
207 DRM_ERROR("Called for atomic driver, this is not what you want.\n");
208
209 drm_modeset_lock_all(dev);
210 __drm_helper_disable_unused_functions(dev);
211 drm_modeset_unlock_all(dev);
212}
213EXPORT_SYMBOL(drm_helper_disable_unused_functions);
214
215/*
216 * Check the CRTC we're going to map each output to vs. its current
217 * CRTC. If they don't match, we have to disable the output and the CRTC
218 * since the driver will have to re-route things.
219 */
220static void
221drm_crtc_prepare_encoders(struct drm_device *dev)
222{
223 const struct drm_encoder_helper_funcs *encoder_funcs;
224 struct drm_encoder *encoder;
225
226 drm_for_each_encoder(encoder, dev) {
227 encoder_funcs = encoder->helper_private;
228 if (!encoder_funcs)
229 continue;
230
231 /* Disable unused encoders */
232 if (encoder->crtc == NULL)
233 drm_encoder_disable(encoder);
234 /* Disable encoders whose CRTC is about to change */
235 if (encoder_funcs->get_crtc &&
236 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
237 drm_encoder_disable(encoder);
238 }
239}
240
241/**
242 * drm_crtc_helper_set_mode - internal helper to set a mode
243 * @crtc: CRTC to program
244 * @mode: mode to use
245 * @x: horizontal offset into the surface
246 * @y: vertical offset into the surface
247 * @old_fb: old framebuffer, for cleanup
248 *
249 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
250 * to fixup or reject the mode prior to trying to set it. This is an internal
251 * helper that drivers could e.g. use to update properties that require the
252 * entire output pipe to be disabled and re-enabled in a new configuration. For
253 * example for changing whether audio is enabled on a hdmi link or for changing
254 * panel fitter or dither attributes. It is also called by the
255 * drm_crtc_helper_set_config() helper function to drive the mode setting
256 * sequence.
257 *
258 * Returns:
259 * True if the mode was set successfully, false otherwise.
260 */
261bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
262 struct drm_display_mode *mode,
263 int x, int y,
264 struct drm_framebuffer *old_fb)
265{
266 struct drm_device *dev = crtc->dev;
267 struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
268 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
269 const struct drm_encoder_helper_funcs *encoder_funcs;
270 int saved_x, saved_y;
271 bool saved_enabled;
272 struct drm_encoder *encoder;
273 bool ret = true;
274
275 drm_warn_on_modeset_not_all_locked(dev);
276
277 saved_enabled = crtc->enabled;
278 crtc->enabled = drm_helper_crtc_in_use(crtc);
279 if (!crtc->enabled)
280 return true;
281
282 adjusted_mode = drm_mode_duplicate(dev, mode);
283 if (!adjusted_mode) {
284 crtc->enabled = saved_enabled;
285 return false;
286 }
287
288 saved_mode = crtc->mode;
289 saved_hwmode = crtc->hwmode;
290 saved_x = crtc->x;
291 saved_y = crtc->y;
292
293 /* Update crtc values up front so the driver can rely on them for mode
294 * setting.
295 */
296 crtc->mode = *mode;
297 crtc->x = x;
298 crtc->y = y;
299
300 /* Pass our mode to the connectors and the CRTC to give them a chance to
301 * adjust it according to limitations or connector properties, and also
302 * a chance to reject the mode entirely.
303 */
304 drm_for_each_encoder(encoder, dev) {
305
306 if (encoder->crtc != crtc)
307 continue;
308
309 encoder_funcs = encoder->helper_private;
310 if (!encoder_funcs)
311 continue;
312
313 ret = drm_bridge_mode_fixup(encoder->bridge,
314 mode, adjusted_mode);
315 if (!ret) {
316 DRM_DEBUG_KMS("Bridge fixup failed\n");
317 goto done;
318 }
319
320 encoder_funcs = encoder->helper_private;
321 if (encoder_funcs->mode_fixup) {
322 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
323 adjusted_mode))) {
324 DRM_DEBUG_KMS("Encoder fixup failed\n");
325 goto done;
326 }
327 }
328 }
329
330 if (crtc_funcs->mode_fixup) {
331 if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
332 adjusted_mode))) {
333 DRM_DEBUG_KMS("CRTC fixup failed\n");
334 goto done;
335 }
336 }
337 DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
338
339 crtc->hwmode = *adjusted_mode;
340
341 /* Prepare the encoders and CRTCs before setting the mode. */
342 drm_for_each_encoder(encoder, dev) {
343
344 if (encoder->crtc != crtc)
345 continue;
346
347 encoder_funcs = encoder->helper_private;
348 if (!encoder_funcs)
349 continue;
350
351 drm_bridge_disable(encoder->bridge);
352
353 /* Disable the encoders as the first thing we do. */
354 if (encoder_funcs->prepare)
355 encoder_funcs->prepare(encoder);
356
357 drm_bridge_post_disable(encoder->bridge);
358 }
359
360 drm_crtc_prepare_encoders(dev);
361
362 crtc_funcs->prepare(crtc);
363
364 /* Set up the DPLL and any encoders state that needs to adjust or depend
365 * on the DPLL.
366 */
367 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
368 if (!ret)
369 goto done;
370
371 drm_for_each_encoder(encoder, dev) {
372
373 if (encoder->crtc != crtc)
374 continue;
375
376 encoder_funcs = encoder->helper_private;
377 if (!encoder_funcs)
378 continue;
379
380 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
381 encoder->base.id, encoder->name,
382 mode->base.id, mode->name);
383 if (encoder_funcs->mode_set)
384 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
385
386 drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
387 }
388
389 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
390 crtc_funcs->commit(crtc);
391
392 drm_for_each_encoder(encoder, dev) {
393
394 if (encoder->crtc != crtc)
395 continue;
396
397 encoder_funcs = encoder->helper_private;
398 if (!encoder_funcs)
399 continue;
400
401 drm_bridge_pre_enable(encoder->bridge);
402
403 if (encoder_funcs->commit)
404 encoder_funcs->commit(encoder);
405
406 drm_bridge_enable(encoder->bridge);
407 }
408
409 /* Calculate and store various constants which
410 * are later needed by vblank and swap-completion
411 * timestamping. They are derived from true hwmode.
412 */
413 drm_calc_timestamping_constants(crtc, &crtc->hwmode);
414
415 /* FIXME: add subpixel order */
416done:
417 drm_mode_destroy(dev, adjusted_mode);
418 if (!ret) {
419 crtc->enabled = saved_enabled;
420 crtc->mode = saved_mode;
421 crtc->hwmode = saved_hwmode;
422 crtc->x = saved_x;
423 crtc->y = saved_y;
424 }
425
426 return ret;
427}
428EXPORT_SYMBOL(drm_crtc_helper_set_mode);
429
430static void
431drm_crtc_helper_disable(struct drm_crtc *crtc)
432{
433 struct drm_device *dev = crtc->dev;
434 struct drm_connector *connector;
435 struct drm_encoder *encoder;
436
437 /* Decouple all encoders and their attached connectors from this crtc */
438 drm_for_each_encoder(encoder, dev) {
439 if (encoder->crtc != crtc)
440 continue;
441
442 drm_for_each_connector(connector, dev) {
443 if (connector->encoder != encoder)
444 continue;
445
446 connector->encoder = NULL;
447
448 /*
449 * drm_helper_disable_unused_functions() ought to be
450 * doing this, but since we've decoupled the encoder
451 * from the connector above, the required connection
452 * between them is henceforth no longer available.
453 */
454 connector->dpms = DRM_MODE_DPMS_OFF;
455
456 /* we keep a reference while the encoder is bound */
457 drm_connector_unreference(connector);
458 }
459 }
460
461 __drm_helper_disable_unused_functions(dev);
462}
463
464/**
465 * drm_crtc_helper_set_config - set a new config from userspace
466 * @set: mode set configuration
467 *
468 * The drm_crtc_helper_set_config() helper function implements the set_config
469 * callback of struct &drm_crtc_funcs for drivers using the legacy CRTC helpers.
470 *
471 * It first tries to locate the best encoder for each connector by calling the
472 * connector ->best_encoder() (struct &drm_connector_helper_funcs) helper
473 * operation.
474 *
475 * After locating the appropriate encoders, the helper function will call the
476 * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
477 * or reject it completely in which case an error will be returned to the
478 * application. If the new configuration after mode adjustment is identical to
479 * the current configuration the helper function will return without performing
480 * any other operation.
481 *
482 * If the adjusted mode is identical to the current mode but changes to the
483 * frame buffer need to be applied, the drm_crtc_helper_set_config() function
484 * will call the CRTC ->mode_set_base() (struct &drm_crtc_helper_funcs) helper
485 * operation.
486 *
487 * If the adjusted mode differs from the current mode, or if the
488 * ->mode_set_base() helper operation is not provided, the helper function
489 * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
490 * and ->commit() CRTC and encoder helper operations, in that order.
491 * Alternatively it can also use the dpms and disable helper operations. For
492 * details see struct &drm_crtc_helper_funcs and struct
493 * &drm_encoder_helper_funcs.
494 *
495 * This function is deprecated. New drivers must implement atomic modeset
496 * support, for which this function is unsuitable. Instead drivers should use
497 * drm_atomic_helper_set_config().
498 *
499 * Returns:
500 * Returns 0 on success, negative errno numbers on failure.
501 */
502int drm_crtc_helper_set_config(struct drm_mode_set *set)
503{
504 struct drm_device *dev;
505 struct drm_crtc **save_encoder_crtcs, *new_crtc;
506 struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
507 bool mode_changed = false; /* if true do a full mode set */
508 bool fb_changed = false; /* if true and !mode_changed just do a flip */
509 struct drm_connector *connector;
510 int count = 0, ro, fail = 0;
511 const struct drm_crtc_helper_funcs *crtc_funcs;
512 struct drm_mode_set save_set;
513 int ret;
514 int i;
515
516 DRM_DEBUG_KMS("\n");
517
518 BUG_ON(!set);
519 BUG_ON(!set->crtc);
520 BUG_ON(!set->crtc->helper_private);
521
522 /* Enforce sane interface api - has been abused by the fb helper. */
523 BUG_ON(!set->mode && set->fb);
524 BUG_ON(set->fb && set->num_connectors == 0);
525
526 crtc_funcs = set->crtc->helper_private;
527
528 if (!set->mode)
529 set->fb = NULL;
530
531 if (set->fb) {
532 DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
533 set->crtc->base.id, set->crtc->name,
534 set->fb->base.id,
535 (int)set->num_connectors, set->x, set->y);
536 } else {
537 DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
538 set->crtc->base.id, set->crtc->name);
539 drm_crtc_helper_disable(set->crtc);
540 return 0;
541 }
542
543 dev = set->crtc->dev;
544
545 drm_warn_on_modeset_not_all_locked(dev);
546
547 /*
548 * Allocate space for the backup of all (non-pointer) encoder and
549 * connector data.
550 */
551 save_encoder_crtcs = kzalloc(dev->mode_config.num_encoder *
552 sizeof(struct drm_crtc *), GFP_KERNEL);
553 if (!save_encoder_crtcs)
554 return -ENOMEM;
555
556 save_connector_encoders = kzalloc(dev->mode_config.num_connector *
557 sizeof(struct drm_encoder *), GFP_KERNEL);
558 if (!save_connector_encoders) {
559 kfree(save_encoder_crtcs);
560 return -ENOMEM;
561 }
562
563 /*
564 * Copy data. Note that driver private data is not affected.
565 * Should anything bad happen only the expected state is
566 * restored, not the drivers personal bookkeeping.
567 */
568 count = 0;
569 drm_for_each_encoder(encoder, dev) {
570 save_encoder_crtcs[count++] = encoder->crtc;
571 }
572
573 count = 0;
574 drm_for_each_connector(connector, dev) {
575 save_connector_encoders[count++] = connector->encoder;
576 }
577
578 save_set.crtc = set->crtc;
579 save_set.mode = &set->crtc->mode;
580 save_set.x = set->crtc->x;
581 save_set.y = set->crtc->y;
582 save_set.fb = set->crtc->primary->fb;
583
584 /* We should be able to check here if the fb has the same properties
585 * and then just flip_or_move it */
586 if (set->crtc->primary->fb != set->fb) {
587 /* If we have no fb then treat it as a full mode set */
588 if (set->crtc->primary->fb == NULL) {
589 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
590 mode_changed = true;
591 } else if (set->fb->pixel_format !=
592 set->crtc->primary->fb->pixel_format) {
593 mode_changed = true;
594 } else
595 fb_changed = true;
596 }
597
598 if (set->x != set->crtc->x || set->y != set->crtc->y)
599 fb_changed = true;
600
601 if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
602 DRM_DEBUG_KMS("modes are different, full mode set\n");
603 drm_mode_debug_printmodeline(&set->crtc->mode);
604 drm_mode_debug_printmodeline(set->mode);
605 mode_changed = true;
606 }
607
608 /* take a reference on all unbound connectors in set, reuse the
609 * already taken reference for bound connectors
610 */
611 for (ro = 0; ro < set->num_connectors; ro++) {
612 if (set->connectors[ro]->encoder)
613 continue;
614 drm_connector_reference(set->connectors[ro]);
615 }
616
617 /* a) traverse passed in connector list and get encoders for them */
618 count = 0;
619 drm_for_each_connector(connector, dev) {
620 const struct drm_connector_helper_funcs *connector_funcs =
621 connector->helper_private;
622 new_encoder = connector->encoder;
623 for (ro = 0; ro < set->num_connectors; ro++) {
624 if (set->connectors[ro] == connector) {
625 new_encoder = connector_funcs->best_encoder(connector);
626 /* if we can't get an encoder for a connector
627 we are setting now - then fail */
628 if (new_encoder == NULL)
629 /* don't break so fail path works correct */
630 fail = 1;
631
632 if (connector->dpms != DRM_MODE_DPMS_ON) {
633 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
634 mode_changed = true;
635 }
636
637 break;
638 }
639 }
640
641 if (new_encoder != connector->encoder) {
642 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
643 mode_changed = true;
644 /* If the encoder is reused for another connector, then
645 * the appropriate crtc will be set later.
646 */
647 if (connector->encoder)
648 connector->encoder->crtc = NULL;
649 connector->encoder = new_encoder;
650 }
651 }
652
653 if (fail) {
654 ret = -EINVAL;
655 goto fail;
656 }
657
658 count = 0;
659 drm_for_each_connector(connector, dev) {
660 if (!connector->encoder)
661 continue;
662
663 if (connector->encoder->crtc == set->crtc)
664 new_crtc = NULL;
665 else
666 new_crtc = connector->encoder->crtc;
667
668 for (ro = 0; ro < set->num_connectors; ro++) {
669 if (set->connectors[ro] == connector)
670 new_crtc = set->crtc;
671 }
672
673 /* Make sure the new CRTC will work with the encoder */
674 if (new_crtc &&
675 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
676 ret = -EINVAL;
677 goto fail;
678 }
679 if (new_crtc != connector->encoder->crtc) {
680 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
681 mode_changed = true;
682 connector->encoder->crtc = new_crtc;
683 }
684 if (new_crtc) {
685 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
686 connector->base.id, connector->name,
687 new_crtc->base.id, new_crtc->name);
688 } else {
689 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
690 connector->base.id, connector->name);
691 }
692 }
693
694 /* mode_set_base is not a required function */
695 if (fb_changed && !crtc_funcs->mode_set_base)
696 mode_changed = true;
697
698 if (mode_changed) {
699 if (drm_helper_crtc_in_use(set->crtc)) {
700 DRM_DEBUG_KMS("attempting to set mode from"
701 " userspace\n");
702 drm_mode_debug_printmodeline(set->mode);
703 set->crtc->primary->fb = set->fb;
704 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
705 set->x, set->y,
706 save_set.fb)) {
707 DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
708 set->crtc->base.id, set->crtc->name);
709 set->crtc->primary->fb = save_set.fb;
710 ret = -EINVAL;
711 goto fail;
712 }
713 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
714 for (i = 0; i < set->num_connectors; i++) {
715 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
716 set->connectors[i]->name);
717 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
718 }
719 }
720 __drm_helper_disable_unused_functions(dev);
721 } else if (fb_changed) {
722 set->crtc->x = set->x;
723 set->crtc->y = set->y;
724 set->crtc->primary->fb = set->fb;
725 ret = crtc_funcs->mode_set_base(set->crtc,
726 set->x, set->y, save_set.fb);
727 if (ret != 0) {
728 set->crtc->x = save_set.x;
729 set->crtc->y = save_set.y;
730 set->crtc->primary->fb = save_set.fb;
731 goto fail;
732 }
733 }
734
735 kfree(save_connector_encoders);
736 kfree(save_encoder_crtcs);
737 return 0;
738
739fail:
740 /* Restore all previous data. */
741 count = 0;
742 drm_for_each_encoder(encoder, dev) {
743 encoder->crtc = save_encoder_crtcs[count++];
744 }
745
746 count = 0;
747 drm_for_each_connector(connector, dev) {
748 connector->encoder = save_connector_encoders[count++];
749 }
750
751 /* after fail drop reference on all unbound connectors in set, let
752 * bound connectors keep their reference
753 */
754 for (ro = 0; ro < set->num_connectors; ro++) {
755 if (set->connectors[ro]->encoder)
756 continue;
757 drm_connector_unreference(set->connectors[ro]);
758 }
759
760 /* Try to restore the config */
761 if (mode_changed &&
762 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
763 save_set.y, save_set.fb))
764 DRM_ERROR("failed to restore config after modeset failure\n");
765
766 kfree(save_connector_encoders);
767 kfree(save_encoder_crtcs);
768 return ret;
769}
770EXPORT_SYMBOL(drm_crtc_helper_set_config);
771
772static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
773{
774 int dpms = DRM_MODE_DPMS_OFF;
775 struct drm_connector *connector;
776 struct drm_device *dev = encoder->dev;
777
778 drm_for_each_connector(connector, dev)
779 if (connector->encoder == encoder)
780 if (connector->dpms < dpms)
781 dpms = connector->dpms;
782 return dpms;
783}
784
785/* Helper which handles bridge ordering around encoder dpms */
786static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
787{
788 struct drm_bridge *bridge = encoder->bridge;
789 const struct drm_encoder_helper_funcs *encoder_funcs;
790
791 encoder_funcs = encoder->helper_private;
792 if (!encoder_funcs)
793 return;
794
795 if (mode == DRM_MODE_DPMS_ON)
796 drm_bridge_pre_enable(bridge);
797 else
798 drm_bridge_disable(bridge);
799
800 if (encoder_funcs->dpms)
801 encoder_funcs->dpms(encoder, mode);
802
803 if (mode == DRM_MODE_DPMS_ON)
804 drm_bridge_enable(bridge);
805 else
806 drm_bridge_post_disable(bridge);
807}
808
809static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
810{
811 int dpms = DRM_MODE_DPMS_OFF;
812 struct drm_connector *connector;
813 struct drm_device *dev = crtc->dev;
814
815 drm_for_each_connector(connector, dev)
816 if (connector->encoder && connector->encoder->crtc == crtc)
817 if (connector->dpms < dpms)
818 dpms = connector->dpms;
819 return dpms;
820}
821
822/**
823 * drm_helper_connector_dpms() - connector dpms helper implementation
824 * @connector: affected connector
825 * @mode: DPMS mode
826 *
827 * The drm_helper_connector_dpms() helper function implements the ->dpms()
828 * callback of struct &drm_connector_funcs for drivers using the legacy CRTC helpers.
829 *
830 * This is the main helper function provided by the CRTC helper framework for
831 * implementing the DPMS connector attribute. It computes the new desired DPMS
832 * state for all encoders and CRTCs in the output mesh and calls the ->dpms()
833 * callbacks provided by the driver in struct &drm_crtc_helper_funcs and struct
834 * &drm_encoder_helper_funcs appropriately.
835 *
836 * This function is deprecated. New drivers must implement atomic modeset
837 * support, for which this function is unsuitable. Instead drivers should use
838 * drm_atomic_helper_connector_dpms().
839 *
840 * Returns:
841 * Always returns 0.
842 */
843int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
844{
845 struct drm_encoder *encoder = connector->encoder;
846 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
847 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
848
849 if (mode == connector->dpms)
850 return 0;
851
852 old_dpms = connector->dpms;
853 connector->dpms = mode;
854
855 if (encoder)
856 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
857
858 /* from off to on, do crtc then encoder */
859 if (mode < old_dpms) {
860 if (crtc) {
861 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
862 if (crtc_funcs->dpms)
863 (*crtc_funcs->dpms) (crtc,
864 drm_helper_choose_crtc_dpms(crtc));
865 }
866 if (encoder)
867 drm_helper_encoder_dpms(encoder, encoder_dpms);
868 }
869
870 /* from on to off, do encoder then crtc */
871 if (mode > old_dpms) {
872 if (encoder)
873 drm_helper_encoder_dpms(encoder, encoder_dpms);
874 if (crtc) {
875 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
876 if (crtc_funcs->dpms)
877 (*crtc_funcs->dpms) (crtc,
878 drm_helper_choose_crtc_dpms(crtc));
879 }
880 }
881
882 return 0;
883}
884EXPORT_SYMBOL(drm_helper_connector_dpms);
885
886/**
887 * drm_helper_resume_force_mode - force-restore mode setting configuration
888 * @dev: drm_device which should be restored
889 *
890 * Drivers which use the mode setting helpers can use this function to
891 * force-restore the mode setting configuration e.g. on resume or when something
892 * else might have trampled over the hw state (like some overzealous old BIOSen
893 * tended to do).
894 *
895 * This helper doesn't provide a error return value since restoring the old
896 * config should never fail due to resource allocation issues since the driver
897 * has successfully set the restored configuration already. Hence this should
898 * boil down to the equivalent of a few dpms on calls, which also don't provide
899 * an error code.
900 *
901 * Drivers where simply restoring an old configuration again might fail (e.g.
902 * due to slight differences in allocating shared resources when the
903 * configuration is restored in a different order than when userspace set it up)
904 * need to use their own restore logic.
905 *
906 * This function is deprecated. New drivers should implement atomic mode-
907 * setting and use the atomic suspend/resume helpers.
908 *
909 * See also:
910 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
911 */
912void drm_helper_resume_force_mode(struct drm_device *dev)
913{
914 struct drm_crtc *crtc;
915 struct drm_encoder *encoder;
916 const struct drm_crtc_helper_funcs *crtc_funcs;
917 int encoder_dpms;
918 bool ret;
919
920 drm_modeset_lock_all(dev);
921 drm_for_each_crtc(crtc, dev) {
922
923 if (!crtc->enabled)
924 continue;
925
926 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
927 crtc->x, crtc->y, crtc->primary->fb);
928
929 /* Restoring the old config should never fail! */
930 if (ret == false)
931 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
932
933 /* Turn off outputs that were already powered off */
934 if (drm_helper_choose_crtc_dpms(crtc)) {
935 drm_for_each_encoder(encoder, dev) {
936
937 if(encoder->crtc != crtc)
938 continue;
939
940 encoder_dpms = drm_helper_choose_encoder_dpms(
941 encoder);
942
943 drm_helper_encoder_dpms(encoder, encoder_dpms);
944 }
945
946 crtc_funcs = crtc->helper_private;
947 if (crtc_funcs->dpms)
948 (*crtc_funcs->dpms) (crtc,
949 drm_helper_choose_crtc_dpms(crtc));
950 }
951 }
952
953 /* disable the unused connectors while restoring the modesetting */
954 __drm_helper_disable_unused_functions(dev);
955 drm_modeset_unlock_all(dev);
956}
957EXPORT_SYMBOL(drm_helper_resume_force_mode);
958
959/**
960 * drm_helper_crtc_mode_set - mode_set implementation for atomic plane helpers
961 * @crtc: DRM CRTC
962 * @mode: DRM display mode which userspace requested
963 * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks
964 * @x: x offset of the CRTC scanout area on the underlying framebuffer
965 * @y: y offset of the CRTC scanout area on the underlying framebuffer
966 * @old_fb: previous framebuffer
967 *
968 * This function implements a callback useable as the ->mode_set callback
969 * required by the CRTC helpers. Besides the atomic plane helper functions for
970 * the primary plane the driver must also provide the ->mode_set_nofb callback
971 * to set up the CRTC.
972 *
973 * This is a transitional helper useful for converting drivers to the atomic
974 * interfaces.
975 */
976int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
977 struct drm_display_mode *adjusted_mode, int x, int y,
978 struct drm_framebuffer *old_fb)
979{
980 struct drm_crtc_state *crtc_state;
981 const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
982 int ret;
983
984 if (crtc->funcs->atomic_duplicate_state)
985 crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
986 else {
987 if (!crtc->state)
988 drm_atomic_helper_crtc_reset(crtc);
989
990 crtc_state = drm_atomic_helper_crtc_duplicate_state(crtc);
991 }
992
993 if (!crtc_state)
994 return -ENOMEM;
995
996 crtc_state->planes_changed = true;
997 crtc_state->mode_changed = true;
998 ret = drm_atomic_set_mode_for_crtc(crtc_state, mode);
999 if (ret)
1000 goto out;
1001 drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode);
1002
1003 if (crtc_funcs->atomic_check) {
1004 ret = crtc_funcs->atomic_check(crtc, crtc_state);
1005 if (ret)
1006 goto out;
1007 }
1008
1009 swap(crtc->state, crtc_state);
1010
1011 crtc_funcs->mode_set_nofb(crtc);
1012
1013 ret = drm_helper_crtc_mode_set_base(crtc, x, y, old_fb);
1014
1015out:
1016 if (crtc_state) {
1017 if (crtc->funcs->atomic_destroy_state)
1018 crtc->funcs->atomic_destroy_state(crtc, crtc_state);
1019 else
1020 drm_atomic_helper_crtc_destroy_state(crtc, crtc_state);
1021 }
1022
1023 return ret;
1024}
1025EXPORT_SYMBOL(drm_helper_crtc_mode_set);
1026
1027/**
1028 * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers
1029 * @crtc: DRM CRTC
1030 * @x: x offset of the CRTC scanout area on the underlying framebuffer
1031 * @y: y offset of the CRTC scanout area on the underlying framebuffer
1032 * @old_fb: previous framebuffer
1033 *
1034 * This function implements a callback useable as the ->mode_set_base used
1035 * required by the CRTC helpers. The driver must provide the atomic plane helper
1036 * functions for the primary plane.
1037 *
1038 * This is a transitional helper useful for converting drivers to the atomic
1039 * interfaces.
1040 */
1041int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
1042 struct drm_framebuffer *old_fb)
1043{
1044 struct drm_plane_state *plane_state;
1045 struct drm_plane *plane = crtc->primary;
1046
1047 if (plane->funcs->atomic_duplicate_state)
1048 plane_state = plane->funcs->atomic_duplicate_state(plane);
1049 else {
1050 if (!plane->state)
1051 drm_atomic_helper_plane_reset(plane);
1052
1053 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
1054 }
1055 if (!plane_state)
1056 return -ENOMEM;
1057 plane_state->plane = plane;
1058
1059 plane_state->crtc = crtc;
1060 drm_atomic_set_fb_for_plane(plane_state, crtc->primary->fb);
1061 plane_state->crtc_x = 0;
1062 plane_state->crtc_y = 0;
1063 plane_state->crtc_h = crtc->mode.vdisplay;
1064 plane_state->crtc_w = crtc->mode.hdisplay;
1065 plane_state->src_x = x << 16;
1066 plane_state->src_y = y << 16;
1067 plane_state->src_h = crtc->mode.vdisplay << 16;
1068 plane_state->src_w = crtc->mode.hdisplay << 16;
1069
1070 return drm_plane_helper_commit(plane, plane_state, old_fb);
1071}
1072EXPORT_SYMBOL(drm_helper_crtc_mode_set_base);