Line data Source code
1 : /*
2 : * Copyright (C) 2014 Red Hat
3 : * Copyright (C) 2014 Intel Corp.
4 : *
5 : * Permission is hereby granted, free of charge, to any person obtaining a
6 : * copy of this software and associated documentation files (the "Software"),
7 : * to deal in the Software without restriction, including without limitation
8 : * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 : * and/or sell copies of the Software, and to permit persons to whom the
10 : * Software is furnished to do so, subject to the following conditions:
11 : *
12 : * The above copyright notice and this permission notice shall be included in
13 : * all copies or substantial portions of the Software.
14 : *
15 : * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 : * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 : * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 : * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 : * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 : * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 : * OTHER DEALINGS IN THE SOFTWARE.
22 : *
23 : * Authors:
24 : * Rob Clark <robdclark@gmail.com>
25 : * Daniel Vetter <daniel.vetter@ffwll.ch>
26 : */
27 :
28 : #include <linux/dma-fence.h>
29 : #include <linux/ktime.h>
30 :
31 : #include <drm/drm_atomic.h>
32 : #include <drm/drm_atomic_helper.h>
33 : #include <drm/drm_atomic_uapi.h>
34 : #include <drm/drm_bridge.h>
35 : #include <drm/drm_damage_helper.h>
36 : #include <drm/drm_device.h>
37 : #include <drm/drm_drv.h>
38 : #include <drm/drm_gem_atomic_helper.h>
39 : #include <drm/drm_plane_helper.h>
40 : #include <drm/drm_print.h>
41 : #include <drm/drm_self_refresh_helper.h>
42 : #include <drm/drm_vblank.h>
43 : #include <drm/drm_writeback.h>
44 :
45 : #include "drm_crtc_helper_internal.h"
46 : #include "drm_crtc_internal.h"
47 :
48 : /**
49 : * DOC: overview
50 : *
51 : * This helper library provides implementations of check and commit functions on
52 : * top of the CRTC modeset helper callbacks and the plane helper callbacks. It
53 : * also provides convenience implementations for the atomic state handling
54 : * callbacks for drivers which don't need to subclass the drm core structures to
55 : * add their own additional internal state.
56 : *
57 : * This library also provides default implementations for the check callback in
58 : * drm_atomic_helper_check() and for the commit callback with
59 : * drm_atomic_helper_commit(). But the individual stages and callbacks are
60 : * exposed to allow drivers to mix and match and e.g. use the plane helpers only
61 : * together with a driver private modeset implementation.
62 : *
63 : * This library also provides implementations for all the legacy driver
64 : * interfaces on top of the atomic interface. See drm_atomic_helper_set_config(),
65 : * drm_atomic_helper_disable_plane(), and the various functions to implement
66 : * set_property callbacks. New drivers must not implement these functions
67 : * themselves but must use the provided helpers.
68 : *
69 : * The atomic helper uses the same function table structures as all other
70 : * modesetting helpers. See the documentation for &struct drm_crtc_helper_funcs,
71 : * struct &drm_encoder_helper_funcs and &struct drm_connector_helper_funcs. It
72 : * also shares the &struct drm_plane_helper_funcs function table with the plane
73 : * helpers.
74 : */
75 : static void
76 0 : drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
77 : struct drm_plane_state *old_plane_state,
78 : struct drm_plane_state *plane_state,
79 : struct drm_plane *plane)
80 : {
81 : struct drm_crtc_state *crtc_state;
82 :
83 0 : if (old_plane_state->crtc) {
84 0 : crtc_state = drm_atomic_get_new_crtc_state(state,
85 : old_plane_state->crtc);
86 :
87 0 : if (WARN_ON(!crtc_state))
88 : return;
89 :
90 0 : crtc_state->planes_changed = true;
91 : }
92 :
93 0 : if (plane_state->crtc) {
94 0 : crtc_state = drm_atomic_get_new_crtc_state(state, plane_state->crtc);
95 :
96 0 : if (WARN_ON(!crtc_state))
97 : return;
98 :
99 0 : crtc_state->planes_changed = true;
100 : }
101 : }
102 :
103 0 : static int handle_conflicting_encoders(struct drm_atomic_state *state,
104 : bool disable_conflicting_encoders)
105 : {
106 : struct drm_connector_state *new_conn_state;
107 : struct drm_connector *connector;
108 : struct drm_connector_list_iter conn_iter;
109 : struct drm_encoder *encoder;
110 0 : unsigned int encoder_mask = 0;
111 0 : int i, ret = 0;
112 :
113 : /*
114 : * First loop, find all newly assigned encoders from the connectors
115 : * part of the state. If the same encoder is assigned to multiple
116 : * connectors bail out.
117 : */
118 0 : for_each_new_connector_in_state(state, connector, new_conn_state, i) {
119 0 : const struct drm_connector_helper_funcs *funcs = connector->helper_private;
120 : struct drm_encoder *new_encoder;
121 :
122 0 : if (!new_conn_state->crtc)
123 0 : continue;
124 :
125 0 : if (funcs->atomic_best_encoder)
126 0 : new_encoder = funcs->atomic_best_encoder(connector,
127 : state);
128 0 : else if (funcs->best_encoder)
129 0 : new_encoder = funcs->best_encoder(connector);
130 : else
131 0 : new_encoder = drm_connector_get_single_encoder(connector);
132 :
133 0 : if (new_encoder) {
134 0 : if (encoder_mask & drm_encoder_mask(new_encoder)) {
135 0 : drm_dbg_atomic(connector->dev,
136 : "[ENCODER:%d:%s] on [CONNECTOR:%d:%s] already assigned\n",
137 : new_encoder->base.id, new_encoder->name,
138 : connector->base.id, connector->name);
139 :
140 0 : return -EINVAL;
141 : }
142 :
143 0 : encoder_mask |= drm_encoder_mask(new_encoder);
144 : }
145 : }
146 :
147 0 : if (!encoder_mask)
148 : return 0;
149 :
150 : /*
151 : * Second loop, iterate over all connectors not part of the state.
152 : *
153 : * If a conflicting encoder is found and disable_conflicting_encoders
154 : * is not set, an error is returned. Userspace can provide a solution
155 : * through the atomic ioctl.
156 : *
157 : * If the flag is set conflicting connectors are removed from the CRTC
158 : * and the CRTC is disabled if no encoder is left. This preserves
159 : * compatibility with the legacy set_config behavior.
160 : */
161 0 : drm_connector_list_iter_begin(state->dev, &conn_iter);
162 0 : drm_for_each_connector_iter(connector, &conn_iter) {
163 : struct drm_crtc_state *crtc_state;
164 :
165 0 : if (drm_atomic_get_new_connector_state(state, connector))
166 0 : continue;
167 :
168 0 : encoder = connector->state->best_encoder;
169 0 : if (!encoder || !(encoder_mask & drm_encoder_mask(encoder)))
170 0 : continue;
171 :
172 0 : if (!disable_conflicting_encoders) {
173 0 : drm_dbg_atomic(connector->dev,
174 : "[ENCODER:%d:%s] in use on [CRTC:%d:%s] by [CONNECTOR:%d:%s]\n",
175 : encoder->base.id, encoder->name,
176 : connector->state->crtc->base.id,
177 : connector->state->crtc->name,
178 : connector->base.id, connector->name);
179 0 : ret = -EINVAL;
180 0 : goto out;
181 : }
182 :
183 0 : new_conn_state = drm_atomic_get_connector_state(state, connector);
184 0 : if (IS_ERR(new_conn_state)) {
185 0 : ret = PTR_ERR(new_conn_state);
186 0 : goto out;
187 : }
188 :
189 0 : drm_dbg_atomic(connector->dev,
190 : "[ENCODER:%d:%s] in use on [CRTC:%d:%s], disabling [CONNECTOR:%d:%s]\n",
191 : encoder->base.id, encoder->name,
192 : new_conn_state->crtc->base.id, new_conn_state->crtc->name,
193 : connector->base.id, connector->name);
194 :
195 0 : crtc_state = drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);
196 :
197 0 : ret = drm_atomic_set_crtc_for_connector(new_conn_state, NULL);
198 0 : if (ret)
199 : goto out;
200 :
201 0 : if (!crtc_state->connector_mask) {
202 0 : ret = drm_atomic_set_mode_prop_for_crtc(crtc_state,
203 : NULL);
204 0 : if (ret < 0)
205 : goto out;
206 :
207 0 : crtc_state->active = false;
208 : }
209 : }
210 : out:
211 0 : drm_connector_list_iter_end(&conn_iter);
212 :
213 0 : return ret;
214 : }
215 :
216 : static void
217 0 : set_best_encoder(struct drm_atomic_state *state,
218 : struct drm_connector_state *conn_state,
219 : struct drm_encoder *encoder)
220 : {
221 : struct drm_crtc_state *crtc_state;
222 : struct drm_crtc *crtc;
223 :
224 0 : if (conn_state->best_encoder) {
225 : /* Unset the encoder_mask in the old crtc state. */
226 0 : crtc = conn_state->connector->state->crtc;
227 :
228 : /* A NULL crtc is an error here because we should have
229 : * duplicated a NULL best_encoder when crtc was NULL.
230 : * As an exception restoring duplicated atomic state
231 : * during resume is allowed, so don't warn when
232 : * best_encoder is equal to encoder we intend to set.
233 : */
234 0 : WARN_ON(!crtc && encoder != conn_state->best_encoder);
235 0 : if (crtc) {
236 0 : crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
237 :
238 0 : crtc_state->encoder_mask &=
239 0 : ~drm_encoder_mask(conn_state->best_encoder);
240 : }
241 : }
242 :
243 0 : if (encoder) {
244 0 : crtc = conn_state->crtc;
245 0 : WARN_ON(!crtc);
246 0 : if (crtc) {
247 0 : crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
248 :
249 0 : crtc_state->encoder_mask |=
250 0 : drm_encoder_mask(encoder);
251 : }
252 : }
253 :
254 0 : conn_state->best_encoder = encoder;
255 0 : }
256 :
257 : static void
258 0 : steal_encoder(struct drm_atomic_state *state,
259 : struct drm_encoder *encoder)
260 : {
261 : struct drm_crtc_state *crtc_state;
262 : struct drm_connector *connector;
263 : struct drm_connector_state *old_connector_state, *new_connector_state;
264 : int i;
265 :
266 0 : for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
267 : struct drm_crtc *encoder_crtc;
268 :
269 0 : if (new_connector_state->best_encoder != encoder)
270 0 : continue;
271 :
272 0 : encoder_crtc = old_connector_state->crtc;
273 :
274 0 : drm_dbg_atomic(encoder->dev,
275 : "[ENCODER:%d:%s] in use on [CRTC:%d:%s], stealing it\n",
276 : encoder->base.id, encoder->name,
277 : encoder_crtc->base.id, encoder_crtc->name);
278 :
279 0 : set_best_encoder(state, new_connector_state, NULL);
280 :
281 0 : crtc_state = drm_atomic_get_new_crtc_state(state, encoder_crtc);
282 0 : crtc_state->connectors_changed = true;
283 :
284 0 : return;
285 : }
286 : }
287 :
288 : static int
289 0 : update_connector_routing(struct drm_atomic_state *state,
290 : struct drm_connector *connector,
291 : struct drm_connector_state *old_connector_state,
292 : struct drm_connector_state *new_connector_state)
293 : {
294 : const struct drm_connector_helper_funcs *funcs;
295 : struct drm_encoder *new_encoder;
296 : struct drm_crtc_state *crtc_state;
297 :
298 0 : drm_dbg_atomic(connector->dev, "Updating routing for [CONNECTOR:%d:%s]\n",
299 : connector->base.id, connector->name);
300 :
301 0 : if (old_connector_state->crtc != new_connector_state->crtc) {
302 0 : if (old_connector_state->crtc) {
303 0 : crtc_state = drm_atomic_get_new_crtc_state(state, old_connector_state->crtc);
304 0 : crtc_state->connectors_changed = true;
305 : }
306 :
307 0 : if (new_connector_state->crtc) {
308 0 : crtc_state = drm_atomic_get_new_crtc_state(state, new_connector_state->crtc);
309 0 : crtc_state->connectors_changed = true;
310 : }
311 : }
312 :
313 0 : if (!new_connector_state->crtc) {
314 0 : drm_dbg_atomic(connector->dev, "Disabling [CONNECTOR:%d:%s]\n",
315 : connector->base.id, connector->name);
316 :
317 0 : set_best_encoder(state, new_connector_state, NULL);
318 :
319 : return 0;
320 : }
321 :
322 0 : crtc_state = drm_atomic_get_new_crtc_state(state,
323 : new_connector_state->crtc);
324 : /*
325 : * For compatibility with legacy users, we want to make sure that
326 : * we allow DPMS On->Off modesets on unregistered connectors. Modesets
327 : * which would result in anything else must be considered invalid, to
328 : * avoid turning on new displays on dead connectors.
329 : *
330 : * Since the connector can be unregistered at any point during an
331 : * atomic check or commit, this is racy. But that's OK: all we care
332 : * about is ensuring that userspace can't do anything but shut off the
333 : * display on a connector that was destroyed after it's been notified,
334 : * not before.
335 : *
336 : * Additionally, we also want to ignore connector registration when
337 : * we're trying to restore an atomic state during system resume since
338 : * there's a chance the connector may have been destroyed during the
339 : * process, but it's better to ignore that then cause
340 : * drm_atomic_helper_resume() to fail.
341 : */
342 0 : if (!state->duplicated && drm_connector_is_unregistered(connector) &&
343 0 : crtc_state->active) {
344 0 : drm_dbg_atomic(connector->dev,
345 : "[CONNECTOR:%d:%s] is not registered\n",
346 : connector->base.id, connector->name);
347 : return -EINVAL;
348 : }
349 :
350 0 : funcs = connector->helper_private;
351 :
352 0 : if (funcs->atomic_best_encoder)
353 0 : new_encoder = funcs->atomic_best_encoder(connector, state);
354 0 : else if (funcs->best_encoder)
355 0 : new_encoder = funcs->best_encoder(connector);
356 : else
357 0 : new_encoder = drm_connector_get_single_encoder(connector);
358 :
359 0 : if (!new_encoder) {
360 0 : drm_dbg_atomic(connector->dev,
361 : "No suitable encoder found for [CONNECTOR:%d:%s]\n",
362 : connector->base.id, connector->name);
363 : return -EINVAL;
364 : }
365 :
366 0 : if (!drm_encoder_crtc_ok(new_encoder, new_connector_state->crtc)) {
367 0 : drm_dbg_atomic(connector->dev,
368 : "[ENCODER:%d:%s] incompatible with [CRTC:%d:%s]\n",
369 : new_encoder->base.id,
370 : new_encoder->name,
371 : new_connector_state->crtc->base.id,
372 : new_connector_state->crtc->name);
373 : return -EINVAL;
374 : }
375 :
376 0 : if (new_encoder == new_connector_state->best_encoder) {
377 0 : set_best_encoder(state, new_connector_state, new_encoder);
378 :
379 0 : drm_dbg_atomic(connector->dev,
380 : "[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d:%s]\n",
381 : connector->base.id,
382 : connector->name,
383 : new_encoder->base.id,
384 : new_encoder->name,
385 : new_connector_state->crtc->base.id,
386 : new_connector_state->crtc->name);
387 :
388 : return 0;
389 : }
390 :
391 0 : steal_encoder(state, new_encoder);
392 :
393 0 : set_best_encoder(state, new_connector_state, new_encoder);
394 :
395 0 : crtc_state->connectors_changed = true;
396 :
397 0 : drm_dbg_atomic(connector->dev,
398 : "[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d:%s]\n",
399 : connector->base.id,
400 : connector->name,
401 : new_encoder->base.id,
402 : new_encoder->name,
403 : new_connector_state->crtc->base.id,
404 : new_connector_state->crtc->name);
405 :
406 : return 0;
407 : }
408 :
409 : static int
410 0 : mode_fixup(struct drm_atomic_state *state)
411 : {
412 : struct drm_crtc *crtc;
413 : struct drm_crtc_state *new_crtc_state;
414 : struct drm_connector *connector;
415 : struct drm_connector_state *new_conn_state;
416 : int i;
417 : int ret;
418 :
419 0 : for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
420 0 : if (!new_crtc_state->mode_changed &&
421 0 : !new_crtc_state->connectors_changed)
422 0 : continue;
423 :
424 0 : drm_mode_copy(&new_crtc_state->adjusted_mode, &new_crtc_state->mode);
425 : }
426 :
427 0 : for_each_new_connector_in_state(state, connector, new_conn_state, i) {
428 : const struct drm_encoder_helper_funcs *funcs;
429 : struct drm_encoder *encoder;
430 : struct drm_bridge *bridge;
431 :
432 0 : WARN_ON(!!new_conn_state->best_encoder != !!new_conn_state->crtc);
433 :
434 0 : if (!new_conn_state->crtc || !new_conn_state->best_encoder)
435 0 : continue;
436 :
437 0 : new_crtc_state =
438 : drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);
439 :
440 : /*
441 : * Each encoder has at most one connector (since we always steal
442 : * it away), so we won't call ->mode_fixup twice.
443 : */
444 0 : encoder = new_conn_state->best_encoder;
445 0 : funcs = encoder->helper_private;
446 :
447 0 : bridge = drm_bridge_chain_get_first_bridge(encoder);
448 0 : ret = drm_atomic_bridge_chain_check(bridge,
449 : new_crtc_state,
450 : new_conn_state);
451 0 : if (ret) {
452 0 : drm_dbg_atomic(encoder->dev, "Bridge atomic check failed\n");
453 0 : return ret;
454 : }
455 :
456 0 : if (funcs && funcs->atomic_check) {
457 0 : ret = funcs->atomic_check(encoder, new_crtc_state,
458 : new_conn_state);
459 0 : if (ret) {
460 0 : drm_dbg_atomic(encoder->dev,
461 : "[ENCODER:%d:%s] check failed\n",
462 : encoder->base.id, encoder->name);
463 0 : return ret;
464 : }
465 0 : } else if (funcs && funcs->mode_fixup) {
466 0 : ret = funcs->mode_fixup(encoder, &new_crtc_state->mode,
467 : &new_crtc_state->adjusted_mode);
468 0 : if (!ret) {
469 0 : drm_dbg_atomic(encoder->dev,
470 : "[ENCODER:%d:%s] fixup failed\n",
471 : encoder->base.id, encoder->name);
472 0 : return -EINVAL;
473 : }
474 : }
475 : }
476 :
477 0 : for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
478 : const struct drm_crtc_helper_funcs *funcs;
479 :
480 0 : if (!new_crtc_state->enable)
481 0 : continue;
482 :
483 0 : if (!new_crtc_state->mode_changed &&
484 0 : !new_crtc_state->connectors_changed)
485 0 : continue;
486 :
487 0 : funcs = crtc->helper_private;
488 0 : if (!funcs || !funcs->mode_fixup)
489 0 : continue;
490 :
491 0 : ret = funcs->mode_fixup(crtc, &new_crtc_state->mode,
492 : &new_crtc_state->adjusted_mode);
493 0 : if (!ret) {
494 0 : drm_dbg_atomic(crtc->dev, "[CRTC:%d:%s] fixup failed\n",
495 : crtc->base.id, crtc->name);
496 0 : return -EINVAL;
497 : }
498 : }
499 :
500 : return 0;
501 : }
502 :
503 0 : static enum drm_mode_status mode_valid_path(struct drm_connector *connector,
504 : struct drm_encoder *encoder,
505 : struct drm_crtc *crtc,
506 : const struct drm_display_mode *mode)
507 : {
508 : struct drm_bridge *bridge;
509 : enum drm_mode_status ret;
510 :
511 0 : ret = drm_encoder_mode_valid(encoder, mode);
512 0 : if (ret != MODE_OK) {
513 0 : drm_dbg_atomic(encoder->dev,
514 : "[ENCODER:%d:%s] mode_valid() failed\n",
515 : encoder->base.id, encoder->name);
516 0 : return ret;
517 : }
518 :
519 0 : bridge = drm_bridge_chain_get_first_bridge(encoder);
520 0 : ret = drm_bridge_chain_mode_valid(bridge, &connector->display_info,
521 : mode);
522 0 : if (ret != MODE_OK) {
523 0 : drm_dbg_atomic(encoder->dev, "[BRIDGE] mode_valid() failed\n");
524 0 : return ret;
525 : }
526 :
527 0 : ret = drm_crtc_mode_valid(crtc, mode);
528 0 : if (ret != MODE_OK) {
529 0 : drm_dbg_atomic(encoder->dev, "[CRTC:%d:%s] mode_valid() failed\n",
530 : crtc->base.id, crtc->name);
531 0 : return ret;
532 : }
533 :
534 : return ret;
535 : }
536 :
537 : static int
538 0 : mode_valid(struct drm_atomic_state *state)
539 : {
540 : struct drm_connector_state *conn_state;
541 : struct drm_connector *connector;
542 : int i;
543 :
544 0 : for_each_new_connector_in_state(state, connector, conn_state, i) {
545 0 : struct drm_encoder *encoder = conn_state->best_encoder;
546 0 : struct drm_crtc *crtc = conn_state->crtc;
547 : struct drm_crtc_state *crtc_state;
548 : enum drm_mode_status mode_status;
549 : const struct drm_display_mode *mode;
550 :
551 0 : if (!crtc || !encoder)
552 0 : continue;
553 :
554 0 : crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
555 0 : if (!crtc_state)
556 0 : continue;
557 0 : if (!crtc_state->mode_changed && !crtc_state->connectors_changed)
558 0 : continue;
559 :
560 0 : mode = &crtc_state->mode;
561 :
562 0 : mode_status = mode_valid_path(connector, encoder, crtc, mode);
563 0 : if (mode_status != MODE_OK)
564 : return -EINVAL;
565 : }
566 :
567 : return 0;
568 : }
569 :
570 : /**
571 : * drm_atomic_helper_check_modeset - validate state object for modeset changes
572 : * @dev: DRM device
573 : * @state: the driver state object
574 : *
575 : * Check the state object to see if the requested state is physically possible.
576 : * This does all the CRTC and connector related computations for an atomic
577 : * update and adds any additional connectors needed for full modesets. It calls
578 : * the various per-object callbacks in the follow order:
579 : *
580 : * 1. &drm_connector_helper_funcs.atomic_best_encoder for determining the new encoder.
581 : * 2. &drm_connector_helper_funcs.atomic_check to validate the connector state.
582 : * 3. If it's determined a modeset is needed then all connectors on the affected
583 : * CRTC are added and &drm_connector_helper_funcs.atomic_check is run on them.
584 : * 4. &drm_encoder_helper_funcs.mode_valid, &drm_bridge_funcs.mode_valid and
585 : * &drm_crtc_helper_funcs.mode_valid are called on the affected components.
586 : * 5. &drm_bridge_funcs.mode_fixup is called on all encoder bridges.
587 : * 6. &drm_encoder_helper_funcs.atomic_check is called to validate any encoder state.
588 : * This function is only called when the encoder will be part of a configured CRTC,
589 : * it must not be used for implementing connector property validation.
590 : * If this function is NULL, &drm_atomic_encoder_helper_funcs.mode_fixup is called
591 : * instead.
592 : * 7. &drm_crtc_helper_funcs.mode_fixup is called last, to fix up the mode with CRTC constraints.
593 : *
594 : * &drm_crtc_state.mode_changed is set when the input mode is changed.
595 : * &drm_crtc_state.connectors_changed is set when a connector is added or
596 : * removed from the CRTC. &drm_crtc_state.active_changed is set when
597 : * &drm_crtc_state.active changes, which is used for DPMS.
598 : * &drm_crtc_state.no_vblank is set from the result of drm_dev_has_vblank().
599 : * See also: drm_atomic_crtc_needs_modeset()
600 : *
601 : * IMPORTANT:
602 : *
603 : * Drivers which set &drm_crtc_state.mode_changed (e.g. in their
604 : * &drm_plane_helper_funcs.atomic_check hooks if a plane update can't be done
605 : * without a full modeset) _must_ call this function after that change. It is
606 : * permitted to call this function multiple times for the same update, e.g.
607 : * when the &drm_crtc_helper_funcs.atomic_check functions depend upon the
608 : * adjusted dotclock for fifo space allocation and watermark computation.
609 : *
610 : * RETURNS:
611 : * Zero for success or -errno
612 : */
613 : int
614 0 : drm_atomic_helper_check_modeset(struct drm_device *dev,
615 : struct drm_atomic_state *state)
616 : {
617 : struct drm_crtc *crtc;
618 : struct drm_crtc_state *old_crtc_state, *new_crtc_state;
619 : struct drm_connector *connector;
620 : struct drm_connector_state *old_connector_state, *new_connector_state;
621 : int i, ret;
622 0 : unsigned int connectors_mask = 0;
623 :
624 0 : for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
625 0 : bool has_connectors =
626 0 : !!new_crtc_state->connector_mask;
627 :
628 0 : WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
629 :
630 0 : if (!drm_mode_equal(&old_crtc_state->mode, &new_crtc_state->mode)) {
631 0 : drm_dbg_atomic(dev, "[CRTC:%d:%s] mode changed\n",
632 : crtc->base.id, crtc->name);
633 0 : new_crtc_state->mode_changed = true;
634 : }
635 :
636 0 : if (old_crtc_state->enable != new_crtc_state->enable) {
637 0 : drm_dbg_atomic(dev, "[CRTC:%d:%s] enable changed\n",
638 : crtc->base.id, crtc->name);
639 :
640 : /*
641 : * For clarity this assignment is done here, but
642 : * enable == 0 is only true when there are no
643 : * connectors and a NULL mode.
644 : *
645 : * The other way around is true as well. enable != 0
646 : * implies that connectors are attached and a mode is set.
647 : */
648 0 : new_crtc_state->mode_changed = true;
649 0 : new_crtc_state->connectors_changed = true;
650 : }
651 :
652 0 : if (old_crtc_state->active != new_crtc_state->active) {
653 0 : drm_dbg_atomic(dev, "[CRTC:%d:%s] active changed\n",
654 : crtc->base.id, crtc->name);
655 0 : new_crtc_state->active_changed = true;
656 : }
657 :
658 0 : if (new_crtc_state->enable != has_connectors) {
659 0 : drm_dbg_atomic(dev, "[CRTC:%d:%s] enabled/connectors mismatch\n",
660 : crtc->base.id, crtc->name);
661 :
662 0 : return -EINVAL;
663 : }
664 :
665 0 : if (drm_dev_has_vblank(dev))
666 0 : new_crtc_state->no_vblank = false;
667 : else
668 0 : new_crtc_state->no_vblank = true;
669 : }
670 :
671 0 : ret = handle_conflicting_encoders(state, false);
672 0 : if (ret)
673 : return ret;
674 :
675 0 : for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
676 0 : const struct drm_connector_helper_funcs *funcs = connector->helper_private;
677 :
678 0 : WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
679 :
680 : /*
681 : * This only sets crtc->connectors_changed for routing changes,
682 : * drivers must set crtc->connectors_changed themselves when
683 : * connector properties need to be updated.
684 : */
685 0 : ret = update_connector_routing(state, connector,
686 : old_connector_state,
687 : new_connector_state);
688 0 : if (ret)
689 : return ret;
690 0 : if (old_connector_state->crtc) {
691 0 : new_crtc_state = drm_atomic_get_new_crtc_state(state,
692 : old_connector_state->crtc);
693 0 : if (old_connector_state->link_status !=
694 0 : new_connector_state->link_status)
695 0 : new_crtc_state->connectors_changed = true;
696 :
697 0 : if (old_connector_state->max_requested_bpc !=
698 0 : new_connector_state->max_requested_bpc)
699 0 : new_crtc_state->connectors_changed = true;
700 : }
701 :
702 0 : if (funcs->atomic_check)
703 0 : ret = funcs->atomic_check(connector, state);
704 0 : if (ret)
705 : return ret;
706 :
707 0 : connectors_mask |= BIT(i);
708 : }
709 :
710 : /*
711 : * After all the routing has been prepared we need to add in any
712 : * connector which is itself unchanged, but whose CRTC changes its
713 : * configuration. This must be done before calling mode_fixup in case a
714 : * crtc only changed its mode but has the same set of connectors.
715 : */
716 0 : for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
717 0 : if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
718 0 : continue;
719 :
720 0 : drm_dbg_atomic(dev,
721 : "[CRTC:%d:%s] needs all connectors, enable: %c, active: %c\n",
722 : crtc->base.id, crtc->name,
723 : new_crtc_state->enable ? 'y' : 'n',
724 : new_crtc_state->active ? 'y' : 'n');
725 :
726 0 : ret = drm_atomic_add_affected_connectors(state, crtc);
727 0 : if (ret != 0)
728 : return ret;
729 :
730 0 : ret = drm_atomic_add_affected_planes(state, crtc);
731 0 : if (ret != 0)
732 : return ret;
733 : }
734 :
735 : /*
736 : * Iterate over all connectors again, to make sure atomic_check()
737 : * has been called on them when a modeset is forced.
738 : */
739 0 : for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
740 0 : const struct drm_connector_helper_funcs *funcs = connector->helper_private;
741 :
742 0 : if (connectors_mask & BIT(i))
743 0 : continue;
744 :
745 0 : if (funcs->atomic_check)
746 0 : ret = funcs->atomic_check(connector, state);
747 0 : if (ret)
748 : return ret;
749 : }
750 :
751 : /*
752 : * Iterate over all connectors again, and add all affected bridges to
753 : * the state.
754 : */
755 0 : for_each_oldnew_connector_in_state(state, connector,
756 : old_connector_state,
757 : new_connector_state, i) {
758 : struct drm_encoder *encoder;
759 :
760 0 : encoder = old_connector_state->best_encoder;
761 0 : ret = drm_atomic_add_encoder_bridges(state, encoder);
762 0 : if (ret)
763 : return ret;
764 :
765 0 : encoder = new_connector_state->best_encoder;
766 0 : ret = drm_atomic_add_encoder_bridges(state, encoder);
767 0 : if (ret)
768 : return ret;
769 : }
770 :
771 0 : ret = mode_valid(state);
772 0 : if (ret)
773 : return ret;
774 :
775 0 : return mode_fixup(state);
776 : }
777 : EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
778 :
779 : /**
780 : * drm_atomic_helper_check_plane_state() - Check plane state for validity
781 : * @plane_state: plane state to check
782 : * @crtc_state: CRTC state to check
783 : * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
784 : * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
785 : * @can_position: is it legal to position the plane such that it
786 : * doesn't cover the entire CRTC? This will generally
787 : * only be false for primary planes.
788 : * @can_update_disabled: can the plane be updated while the CRTC
789 : * is disabled?
790 : *
791 : * Checks that a desired plane update is valid, and updates various
792 : * bits of derived state (clipped coordinates etc.). Drivers that provide
793 : * their own plane handling rather than helper-provided implementations may
794 : * still wish to call this function to avoid duplication of error checking
795 : * code.
796 : *
797 : * RETURNS:
798 : * Zero if update appears valid, error code on failure
799 : */
800 0 : int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
801 : const struct drm_crtc_state *crtc_state,
802 : int min_scale,
803 : int max_scale,
804 : bool can_position,
805 : bool can_update_disabled)
806 : {
807 0 : struct drm_framebuffer *fb = plane_state->fb;
808 0 : struct drm_rect *src = &plane_state->src;
809 0 : struct drm_rect *dst = &plane_state->dst;
810 0 : unsigned int rotation = plane_state->rotation;
811 0 : struct drm_rect clip = {};
812 : int hscale, vscale;
813 :
814 0 : WARN_ON(plane_state->crtc && plane_state->crtc != crtc_state->crtc);
815 :
816 0 : *src = drm_plane_state_src(plane_state);
817 0 : *dst = drm_plane_state_dest(plane_state);
818 :
819 0 : if (!fb) {
820 0 : plane_state->visible = false;
821 0 : return 0;
822 : }
823 :
824 : /* crtc should only be NULL when disabling (i.e., !fb) */
825 0 : if (WARN_ON(!plane_state->crtc)) {
826 0 : plane_state->visible = false;
827 0 : return 0;
828 : }
829 :
830 0 : if (!crtc_state->enable && !can_update_disabled) {
831 0 : drm_dbg_kms(plane_state->plane->dev,
832 : "Cannot update plane of a disabled CRTC.\n");
833 0 : return -EINVAL;
834 : }
835 :
836 0 : drm_rect_rotate(src, fb->width << 16, fb->height << 16, rotation);
837 :
838 : /* Check scaling */
839 0 : hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
840 0 : vscale = drm_rect_calc_vscale(src, dst, min_scale, max_scale);
841 0 : if (hscale < 0 || vscale < 0) {
842 0 : drm_dbg_kms(plane_state->plane->dev,
843 : "Invalid scaling of plane\n");
844 0 : drm_rect_debug_print("src: ", &plane_state->src, true);
845 0 : drm_rect_debug_print("dst: ", &plane_state->dst, false);
846 0 : return -ERANGE;
847 : }
848 :
849 0 : if (crtc_state->enable)
850 0 : drm_mode_get_hv_timing(&crtc_state->mode, &clip.x2, &clip.y2);
851 :
852 0 : plane_state->visible = drm_rect_clip_scaled(src, dst, &clip);
853 :
854 0 : drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16, rotation);
855 :
856 0 : if (!plane_state->visible)
857 : /*
858 : * Plane isn't visible; some drivers can handle this
859 : * so we just return success here. Drivers that can't
860 : * (including those that use the primary plane helper's
861 : * update function) will return an error from their
862 : * update_plane handler.
863 : */
864 : return 0;
865 :
866 0 : if (!can_position && !drm_rect_equals(dst, &clip)) {
867 0 : drm_dbg_kms(plane_state->plane->dev,
868 : "Plane must cover entire CRTC\n");
869 0 : drm_rect_debug_print("dst: ", dst, false);
870 0 : drm_rect_debug_print("clip: ", &clip, false);
871 0 : return -EINVAL;
872 : }
873 :
874 : return 0;
875 : }
876 : EXPORT_SYMBOL(drm_atomic_helper_check_plane_state);
877 :
878 : /**
879 : * drm_atomic_helper_check_planes - validate state object for planes changes
880 : * @dev: DRM device
881 : * @state: the driver state object
882 : *
883 : * Check the state object to see if the requested state is physically possible.
884 : * This does all the plane update related checks using by calling into the
885 : * &drm_crtc_helper_funcs.atomic_check and &drm_plane_helper_funcs.atomic_check
886 : * hooks provided by the driver.
887 : *
888 : * It also sets &drm_crtc_state.planes_changed to indicate that a CRTC has
889 : * updated planes.
890 : *
891 : * RETURNS:
892 : * Zero for success or -errno
893 : */
894 : int
895 0 : drm_atomic_helper_check_planes(struct drm_device *dev,
896 : struct drm_atomic_state *state)
897 : {
898 : struct drm_crtc *crtc;
899 : struct drm_crtc_state *new_crtc_state;
900 : struct drm_plane *plane;
901 : struct drm_plane_state *new_plane_state, *old_plane_state;
902 0 : int i, ret = 0;
903 :
904 0 : for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
905 : const struct drm_plane_helper_funcs *funcs;
906 :
907 0 : WARN_ON(!drm_modeset_is_locked(&plane->mutex));
908 :
909 0 : funcs = plane->helper_private;
910 :
911 0 : drm_atomic_helper_plane_changed(state, old_plane_state, new_plane_state, plane);
912 :
913 0 : drm_atomic_helper_check_plane_damage(state, new_plane_state);
914 :
915 0 : if (!funcs || !funcs->atomic_check)
916 0 : continue;
917 :
918 0 : ret = funcs->atomic_check(plane, state);
919 0 : if (ret) {
920 0 : drm_dbg_atomic(plane->dev,
921 : "[PLANE:%d:%s] atomic driver check failed\n",
922 : plane->base.id, plane->name);
923 0 : return ret;
924 : }
925 : }
926 :
927 0 : for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
928 : const struct drm_crtc_helper_funcs *funcs;
929 :
930 0 : funcs = crtc->helper_private;
931 :
932 0 : if (!funcs || !funcs->atomic_check)
933 0 : continue;
934 :
935 0 : ret = funcs->atomic_check(crtc, state);
936 0 : if (ret) {
937 0 : drm_dbg_atomic(crtc->dev,
938 : "[CRTC:%d:%s] atomic driver check failed\n",
939 : crtc->base.id, crtc->name);
940 0 : return ret;
941 : }
942 : }
943 :
944 : return ret;
945 : }
946 : EXPORT_SYMBOL(drm_atomic_helper_check_planes);
947 :
948 : /**
949 : * drm_atomic_helper_check - validate state object
950 : * @dev: DRM device
951 : * @state: the driver state object
952 : *
953 : * Check the state object to see if the requested state is physically possible.
954 : * Only CRTCs and planes have check callbacks, so for any additional (global)
955 : * checking that a driver needs it can simply wrap that around this function.
956 : * Drivers without such needs can directly use this as their
957 : * &drm_mode_config_funcs.atomic_check callback.
958 : *
959 : * This just wraps the two parts of the state checking for planes and modeset
960 : * state in the default order: First it calls drm_atomic_helper_check_modeset()
961 : * and then drm_atomic_helper_check_planes(). The assumption is that the
962 : * @drm_plane_helper_funcs.atomic_check and @drm_crtc_helper_funcs.atomic_check
963 : * functions depend upon an updated adjusted_mode.clock to e.g. properly compute
964 : * watermarks.
965 : *
966 : * Note that zpos normalization will add all enable planes to the state which
967 : * might not desired for some drivers.
968 : * For example enable/disable of a cursor plane which have fixed zpos value
969 : * would trigger all other enabled planes to be forced to the state change.
970 : *
971 : * RETURNS:
972 : * Zero for success or -errno
973 : */
974 0 : int drm_atomic_helper_check(struct drm_device *dev,
975 : struct drm_atomic_state *state)
976 : {
977 : int ret;
978 :
979 0 : ret = drm_atomic_helper_check_modeset(dev, state);
980 0 : if (ret)
981 : return ret;
982 :
983 0 : if (dev->mode_config.normalize_zpos) {
984 0 : ret = drm_atomic_normalize_zpos(dev, state);
985 0 : if (ret)
986 : return ret;
987 : }
988 :
989 0 : ret = drm_atomic_helper_check_planes(dev, state);
990 0 : if (ret)
991 : return ret;
992 :
993 0 : if (state->legacy_cursor_update)
994 0 : state->async_update = !drm_atomic_helper_async_check(dev, state);
995 :
996 0 : drm_self_refresh_helper_alter_state(state);
997 :
998 0 : return ret;
999 : }
1000 : EXPORT_SYMBOL(drm_atomic_helper_check);
1001 :
1002 : static bool
1003 : crtc_needs_disable(struct drm_crtc_state *old_state,
1004 : struct drm_crtc_state *new_state)
1005 : {
1006 : /*
1007 : * No new_state means the CRTC is off, so the only criteria is whether
1008 : * it's currently active or in self refresh mode.
1009 : */
1010 0 : if (!new_state)
1011 0 : return drm_atomic_crtc_effectively_active(old_state);
1012 :
1013 : /*
1014 : * We need to run through the crtc_funcs->disable() function if the CRTC
1015 : * is currently on, if it's transitioning to self refresh mode, or if
1016 : * it's in self refresh mode and needs to be fully disabled.
1017 : */
1018 0 : return old_state->active ||
1019 0 : (old_state->self_refresh_active && !new_state->active) ||
1020 0 : new_state->self_refresh_active;
1021 : }
1022 :
1023 : static void
1024 0 : disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
1025 : {
1026 : struct drm_connector *connector;
1027 : struct drm_connector_state *old_conn_state, *new_conn_state;
1028 : struct drm_crtc *crtc;
1029 : struct drm_crtc_state *old_crtc_state, *new_crtc_state;
1030 : int i;
1031 :
1032 0 : for_each_oldnew_connector_in_state(old_state, connector, old_conn_state, new_conn_state, i) {
1033 : const struct drm_encoder_helper_funcs *funcs;
1034 : struct drm_encoder *encoder;
1035 : struct drm_bridge *bridge;
1036 :
1037 : /*
1038 : * Shut down everything that's in the changeset and currently
1039 : * still on. So need to check the old, saved state.
1040 : */
1041 0 : if (!old_conn_state->crtc)
1042 0 : continue;
1043 :
1044 0 : old_crtc_state = drm_atomic_get_old_crtc_state(old_state, old_conn_state->crtc);
1045 :
1046 0 : if (new_conn_state->crtc)
1047 0 : new_crtc_state = drm_atomic_get_new_crtc_state(
1048 : old_state,
1049 : new_conn_state->crtc);
1050 : else
1051 : new_crtc_state = NULL;
1052 :
1053 0 : if (!crtc_needs_disable(old_crtc_state, new_crtc_state) ||
1054 0 : !drm_atomic_crtc_needs_modeset(old_conn_state->crtc->state))
1055 0 : continue;
1056 :
1057 0 : encoder = old_conn_state->best_encoder;
1058 :
1059 : /* We shouldn't get this far if we didn't previously have
1060 : * an encoder.. but WARN_ON() rather than explode.
1061 : */
1062 0 : if (WARN_ON(!encoder))
1063 0 : continue;
1064 :
1065 0 : funcs = encoder->helper_private;
1066 :
1067 0 : drm_dbg_atomic(dev, "disabling [ENCODER:%d:%s]\n",
1068 : encoder->base.id, encoder->name);
1069 :
1070 : /*
1071 : * Each encoder has at most one connector (since we always steal
1072 : * it away), so we won't call disable hooks twice.
1073 : */
1074 0 : bridge = drm_bridge_chain_get_first_bridge(encoder);
1075 0 : drm_atomic_bridge_chain_disable(bridge, old_state);
1076 :
1077 : /* Right function depends upon target state. */
1078 0 : if (funcs) {
1079 0 : if (funcs->atomic_disable)
1080 0 : funcs->atomic_disable(encoder, old_state);
1081 0 : else if (new_conn_state->crtc && funcs->prepare)
1082 0 : funcs->prepare(encoder);
1083 0 : else if (funcs->disable)
1084 0 : funcs->disable(encoder);
1085 0 : else if (funcs->dpms)
1086 0 : funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
1087 : }
1088 :
1089 0 : drm_atomic_bridge_chain_post_disable(bridge, old_state);
1090 : }
1091 :
1092 0 : for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
1093 : const struct drm_crtc_helper_funcs *funcs;
1094 : int ret;
1095 :
1096 : /* Shut down everything that needs a full modeset. */
1097 0 : if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
1098 0 : continue;
1099 :
1100 0 : if (!crtc_needs_disable(old_crtc_state, new_crtc_state))
1101 0 : continue;
1102 :
1103 0 : funcs = crtc->helper_private;
1104 :
1105 0 : drm_dbg_atomic(dev, "disabling [CRTC:%d:%s]\n",
1106 : crtc->base.id, crtc->name);
1107 :
1108 :
1109 : /* Right function depends upon target state. */
1110 0 : if (new_crtc_state->enable && funcs->prepare)
1111 0 : funcs->prepare(crtc);
1112 0 : else if (funcs->atomic_disable)
1113 0 : funcs->atomic_disable(crtc, old_state);
1114 0 : else if (funcs->disable)
1115 0 : funcs->disable(crtc);
1116 0 : else if (funcs->dpms)
1117 0 : funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
1118 :
1119 0 : if (!drm_dev_has_vblank(dev))
1120 0 : continue;
1121 :
1122 0 : ret = drm_crtc_vblank_get(crtc);
1123 0 : WARN_ONCE(ret != -EINVAL, "driver forgot to call drm_crtc_vblank_off()\n");
1124 0 : if (ret == 0)
1125 0 : drm_crtc_vblank_put(crtc);
1126 : }
1127 0 : }
1128 :
1129 : /**
1130 : * drm_atomic_helper_update_legacy_modeset_state - update legacy modeset state
1131 : * @dev: DRM device
1132 : * @old_state: atomic state object with old state structures
1133 : *
1134 : * This function updates all the various legacy modeset state pointers in
1135 : * connectors, encoders and CRTCs.
1136 : *
1137 : * Drivers can use this for building their own atomic commit if they don't have
1138 : * a pure helper-based modeset implementation.
1139 : *
1140 : * Since these updates are not synchronized with lockings, only code paths
1141 : * called from &drm_mode_config_helper_funcs.atomic_commit_tail can look at the
1142 : * legacy state filled out by this helper. Defacto this means this helper and
1143 : * the legacy state pointers are only really useful for transitioning an
1144 : * existing driver to the atomic world.
1145 : */
1146 : void
1147 0 : drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
1148 : struct drm_atomic_state *old_state)
1149 : {
1150 : struct drm_connector *connector;
1151 : struct drm_connector_state *old_conn_state, *new_conn_state;
1152 : struct drm_crtc *crtc;
1153 : struct drm_crtc_state *new_crtc_state;
1154 : int i;
1155 :
1156 : /* clear out existing links and update dpms */
1157 0 : for_each_oldnew_connector_in_state(old_state, connector, old_conn_state, new_conn_state, i) {
1158 0 : if (connector->encoder) {
1159 0 : WARN_ON(!connector->encoder->crtc);
1160 :
1161 0 : connector->encoder->crtc = NULL;
1162 0 : connector->encoder = NULL;
1163 : }
1164 :
1165 0 : crtc = new_conn_state->crtc;
1166 0 : if ((!crtc && old_conn_state->crtc) ||
1167 0 : (crtc && drm_atomic_crtc_needs_modeset(crtc->state))) {
1168 0 : int mode = DRM_MODE_DPMS_OFF;
1169 :
1170 0 : if (crtc && crtc->state->active)
1171 0 : mode = DRM_MODE_DPMS_ON;
1172 :
1173 0 : connector->dpms = mode;
1174 : }
1175 : }
1176 :
1177 : /* set new links */
1178 0 : for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
1179 0 : if (!new_conn_state->crtc)
1180 0 : continue;
1181 :
1182 0 : if (WARN_ON(!new_conn_state->best_encoder))
1183 0 : continue;
1184 :
1185 0 : connector->encoder = new_conn_state->best_encoder;
1186 0 : connector->encoder->crtc = new_conn_state->crtc;
1187 : }
1188 :
1189 : /* set legacy state in the crtc structure */
1190 0 : for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
1191 0 : struct drm_plane *primary = crtc->primary;
1192 : struct drm_plane_state *new_plane_state;
1193 :
1194 0 : crtc->mode = new_crtc_state->mode;
1195 0 : crtc->enabled = new_crtc_state->enable;
1196 :
1197 0 : new_plane_state =
1198 : drm_atomic_get_new_plane_state(old_state, primary);
1199 :
1200 0 : if (new_plane_state && new_plane_state->crtc == crtc) {
1201 0 : crtc->x = new_plane_state->src_x >> 16;
1202 0 : crtc->y = new_plane_state->src_y >> 16;
1203 : }
1204 : }
1205 0 : }
1206 : EXPORT_SYMBOL(drm_atomic_helper_update_legacy_modeset_state);
1207 :
1208 : /**
1209 : * drm_atomic_helper_calc_timestamping_constants - update vblank timestamping constants
1210 : * @state: atomic state object
1211 : *
1212 : * Updates the timestamping constants used for precise vblank timestamps
1213 : * by calling drm_calc_timestamping_constants() for all enabled crtcs in @state.
1214 : */
1215 0 : void drm_atomic_helper_calc_timestamping_constants(struct drm_atomic_state *state)
1216 : {
1217 : struct drm_crtc_state *new_crtc_state;
1218 : struct drm_crtc *crtc;
1219 : int i;
1220 :
1221 0 : for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
1222 0 : if (new_crtc_state->enable)
1223 0 : drm_calc_timestamping_constants(crtc,
1224 0 : &new_crtc_state->adjusted_mode);
1225 : }
1226 0 : }
1227 : EXPORT_SYMBOL(drm_atomic_helper_calc_timestamping_constants);
1228 :
1229 : static void
1230 0 : crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
1231 : {
1232 : struct drm_crtc *crtc;
1233 : struct drm_crtc_state *new_crtc_state;
1234 : struct drm_connector *connector;
1235 : struct drm_connector_state *new_conn_state;
1236 : int i;
1237 :
1238 0 : for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
1239 : const struct drm_crtc_helper_funcs *funcs;
1240 :
1241 0 : if (!new_crtc_state->mode_changed)
1242 0 : continue;
1243 :
1244 0 : funcs = crtc->helper_private;
1245 :
1246 0 : if (new_crtc_state->enable && funcs->mode_set_nofb) {
1247 0 : drm_dbg_atomic(dev, "modeset on [CRTC:%d:%s]\n",
1248 : crtc->base.id, crtc->name);
1249 :
1250 0 : funcs->mode_set_nofb(crtc);
1251 : }
1252 : }
1253 :
1254 0 : for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
1255 : const struct drm_encoder_helper_funcs *funcs;
1256 : struct drm_encoder *encoder;
1257 : struct drm_display_mode *mode, *adjusted_mode;
1258 : struct drm_bridge *bridge;
1259 :
1260 0 : if (!new_conn_state->best_encoder)
1261 0 : continue;
1262 :
1263 0 : encoder = new_conn_state->best_encoder;
1264 0 : funcs = encoder->helper_private;
1265 0 : new_crtc_state = new_conn_state->crtc->state;
1266 0 : mode = &new_crtc_state->mode;
1267 0 : adjusted_mode = &new_crtc_state->adjusted_mode;
1268 :
1269 0 : if (!new_crtc_state->mode_changed)
1270 0 : continue;
1271 :
1272 0 : drm_dbg_atomic(dev, "modeset on [ENCODER:%d:%s]\n",
1273 : encoder->base.id, encoder->name);
1274 :
1275 : /*
1276 : * Each encoder has at most one connector (since we always steal
1277 : * it away), so we won't call mode_set hooks twice.
1278 : */
1279 0 : if (funcs && funcs->atomic_mode_set) {
1280 0 : funcs->atomic_mode_set(encoder, new_crtc_state,
1281 : new_conn_state);
1282 0 : } else if (funcs && funcs->mode_set) {
1283 0 : funcs->mode_set(encoder, mode, adjusted_mode);
1284 : }
1285 :
1286 0 : bridge = drm_bridge_chain_get_first_bridge(encoder);
1287 0 : drm_bridge_chain_mode_set(bridge, mode, adjusted_mode);
1288 : }
1289 0 : }
1290 :
1291 : /**
1292 : * drm_atomic_helper_commit_modeset_disables - modeset commit to disable outputs
1293 : * @dev: DRM device
1294 : * @old_state: atomic state object with old state structures
1295 : *
1296 : * This function shuts down all the outputs that need to be shut down and
1297 : * prepares them (if required) with the new mode.
1298 : *
1299 : * For compatibility with legacy CRTC helpers this should be called before
1300 : * drm_atomic_helper_commit_planes(), which is what the default commit function
1301 : * does. But drivers with different needs can group the modeset commits together
1302 : * and do the plane commits at the end. This is useful for drivers doing runtime
1303 : * PM since planes updates then only happen when the CRTC is actually enabled.
1304 : */
1305 0 : void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
1306 : struct drm_atomic_state *old_state)
1307 : {
1308 0 : disable_outputs(dev, old_state);
1309 :
1310 0 : drm_atomic_helper_update_legacy_modeset_state(dev, old_state);
1311 0 : drm_atomic_helper_calc_timestamping_constants(old_state);
1312 :
1313 0 : crtc_set_mode(dev, old_state);
1314 0 : }
1315 : EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables);
1316 :
1317 0 : static void drm_atomic_helper_commit_writebacks(struct drm_device *dev,
1318 : struct drm_atomic_state *old_state)
1319 : {
1320 : struct drm_connector *connector;
1321 : struct drm_connector_state *new_conn_state;
1322 : int i;
1323 :
1324 0 : for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
1325 : const struct drm_connector_helper_funcs *funcs;
1326 :
1327 0 : funcs = connector->helper_private;
1328 0 : if (!funcs->atomic_commit)
1329 0 : continue;
1330 :
1331 0 : if (new_conn_state->writeback_job && new_conn_state->writeback_job->fb) {
1332 0 : WARN_ON(connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK);
1333 0 : funcs->atomic_commit(connector, old_state);
1334 : }
1335 : }
1336 0 : }
1337 :
1338 : /**
1339 : * drm_atomic_helper_commit_modeset_enables - modeset commit to enable outputs
1340 : * @dev: DRM device
1341 : * @old_state: atomic state object with old state structures
1342 : *
1343 : * This function enables all the outputs with the new configuration which had to
1344 : * be turned off for the update.
1345 : *
1346 : * For compatibility with legacy CRTC helpers this should be called after
1347 : * drm_atomic_helper_commit_planes(), which is what the default commit function
1348 : * does. But drivers with different needs can group the modeset commits together
1349 : * and do the plane commits at the end. This is useful for drivers doing runtime
1350 : * PM since planes updates then only happen when the CRTC is actually enabled.
1351 : */
1352 0 : void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
1353 : struct drm_atomic_state *old_state)
1354 : {
1355 : struct drm_crtc *crtc;
1356 : struct drm_crtc_state *old_crtc_state;
1357 : struct drm_crtc_state *new_crtc_state;
1358 : struct drm_connector *connector;
1359 : struct drm_connector_state *new_conn_state;
1360 : int i;
1361 :
1362 0 : for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
1363 : const struct drm_crtc_helper_funcs *funcs;
1364 :
1365 : /* Need to filter out CRTCs where only planes change. */
1366 0 : if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
1367 0 : continue;
1368 :
1369 0 : if (!new_crtc_state->active)
1370 0 : continue;
1371 :
1372 0 : funcs = crtc->helper_private;
1373 :
1374 0 : if (new_crtc_state->enable) {
1375 0 : drm_dbg_atomic(dev, "enabling [CRTC:%d:%s]\n",
1376 : crtc->base.id, crtc->name);
1377 0 : if (funcs->atomic_enable)
1378 0 : funcs->atomic_enable(crtc, old_state);
1379 0 : else if (funcs->commit)
1380 0 : funcs->commit(crtc);
1381 : }
1382 : }
1383 :
1384 0 : for_each_new_connector_in_state(old_state, connector, new_conn_state, i) {
1385 : const struct drm_encoder_helper_funcs *funcs;
1386 : struct drm_encoder *encoder;
1387 : struct drm_bridge *bridge;
1388 :
1389 0 : if (!new_conn_state->best_encoder)
1390 0 : continue;
1391 :
1392 0 : if (!new_conn_state->crtc->state->active ||
1393 0 : !drm_atomic_crtc_needs_modeset(new_conn_state->crtc->state))
1394 0 : continue;
1395 :
1396 0 : encoder = new_conn_state->best_encoder;
1397 0 : funcs = encoder->helper_private;
1398 :
1399 0 : drm_dbg_atomic(dev, "enabling [ENCODER:%d:%s]\n",
1400 : encoder->base.id, encoder->name);
1401 :
1402 : /*
1403 : * Each encoder has at most one connector (since we always steal
1404 : * it away), so we won't call enable hooks twice.
1405 : */
1406 0 : bridge = drm_bridge_chain_get_first_bridge(encoder);
1407 0 : drm_atomic_bridge_chain_pre_enable(bridge, old_state);
1408 :
1409 0 : if (funcs) {
1410 0 : if (funcs->atomic_enable)
1411 0 : funcs->atomic_enable(encoder, old_state);
1412 0 : else if (funcs->enable)
1413 0 : funcs->enable(encoder);
1414 0 : else if (funcs->commit)
1415 0 : funcs->commit(encoder);
1416 : }
1417 :
1418 0 : drm_atomic_bridge_chain_enable(bridge, old_state);
1419 : }
1420 :
1421 0 : drm_atomic_helper_commit_writebacks(dev, old_state);
1422 0 : }
1423 : EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
1424 :
1425 : /**
1426 : * drm_atomic_helper_wait_for_fences - wait for fences stashed in plane state
1427 : * @dev: DRM device
1428 : * @state: atomic state object with old state structures
1429 : * @pre_swap: If true, do an interruptible wait, and @state is the new state.
1430 : * Otherwise @state is the old state.
1431 : *
1432 : * For implicit sync, driver should fish the exclusive fence out from the
1433 : * incoming fb's and stash it in the drm_plane_state. This is called after
1434 : * drm_atomic_helper_swap_state() so it uses the current plane state (and
1435 : * just uses the atomic state to find the changed planes)
1436 : *
1437 : * Note that @pre_swap is needed since the point where we block for fences moves
1438 : * around depending upon whether an atomic commit is blocking or
1439 : * non-blocking. For non-blocking commit all waiting needs to happen after
1440 : * drm_atomic_helper_swap_state() is called, but for blocking commits we want
1441 : * to wait **before** we do anything that can't be easily rolled back. That is
1442 : * before we call drm_atomic_helper_swap_state().
1443 : *
1444 : * Returns zero if success or < 0 if dma_fence_wait() fails.
1445 : */
1446 0 : int drm_atomic_helper_wait_for_fences(struct drm_device *dev,
1447 : struct drm_atomic_state *state,
1448 : bool pre_swap)
1449 : {
1450 : struct drm_plane *plane;
1451 : struct drm_plane_state *new_plane_state;
1452 : int i, ret;
1453 :
1454 0 : for_each_new_plane_in_state(state, plane, new_plane_state, i) {
1455 0 : if (!new_plane_state->fence)
1456 0 : continue;
1457 :
1458 0 : WARN_ON(!new_plane_state->fb);
1459 :
1460 : /*
1461 : * If waiting for fences pre-swap (ie: nonblock), userspace can
1462 : * still interrupt the operation. Instead of blocking until the
1463 : * timer expires, make the wait interruptible.
1464 : */
1465 0 : ret = dma_fence_wait(new_plane_state->fence, pre_swap);
1466 0 : if (ret)
1467 : return ret;
1468 :
1469 0 : dma_fence_put(new_plane_state->fence);
1470 0 : new_plane_state->fence = NULL;
1471 : }
1472 :
1473 : return 0;
1474 : }
1475 : EXPORT_SYMBOL(drm_atomic_helper_wait_for_fences);
1476 :
1477 : /**
1478 : * drm_atomic_helper_wait_for_vblanks - wait for vblank on CRTCs
1479 : * @dev: DRM device
1480 : * @old_state: atomic state object with old state structures
1481 : *
1482 : * Helper to, after atomic commit, wait for vblanks on all affected
1483 : * CRTCs (ie. before cleaning up old framebuffers using
1484 : * drm_atomic_helper_cleanup_planes()). It will only wait on CRTCs where the
1485 : * framebuffers have actually changed to optimize for the legacy cursor and
1486 : * plane update use-case.
1487 : *
1488 : * Drivers using the nonblocking commit tracking support initialized by calling
1489 : * drm_atomic_helper_setup_commit() should look at
1490 : * drm_atomic_helper_wait_for_flip_done() as an alternative.
1491 : */
1492 : void
1493 0 : drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
1494 : struct drm_atomic_state *old_state)
1495 : {
1496 : struct drm_crtc *crtc;
1497 : struct drm_crtc_state *old_crtc_state, *new_crtc_state;
1498 : int i, ret;
1499 0 : unsigned int crtc_mask = 0;
1500 :
1501 : /*
1502 : * Legacy cursor ioctls are completely unsynced, and userspace
1503 : * relies on that (by doing tons of cursor updates).
1504 : */
1505 0 : if (old_state->legacy_cursor_update)
1506 : return;
1507 :
1508 0 : for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
1509 0 : if (!new_crtc_state->active)
1510 0 : continue;
1511 :
1512 0 : ret = drm_crtc_vblank_get(crtc);
1513 0 : if (ret != 0)
1514 0 : continue;
1515 :
1516 0 : crtc_mask |= drm_crtc_mask(crtc);
1517 0 : old_state->crtcs[i].last_vblank_count = drm_crtc_vblank_count(crtc);
1518 : }
1519 :
1520 0 : for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
1521 0 : if (!(crtc_mask & drm_crtc_mask(crtc)))
1522 0 : continue;
1523 :
1524 0 : ret = wait_event_timeout(dev->vblank[i].queue,
1525 : old_state->crtcs[i].last_vblank_count !=
1526 : drm_crtc_vblank_count(crtc),
1527 : msecs_to_jiffies(100));
1528 :
1529 0 : WARN(!ret, "[CRTC:%d:%s] vblank wait timed out\n",
1530 : crtc->base.id, crtc->name);
1531 :
1532 0 : drm_crtc_vblank_put(crtc);
1533 : }
1534 : }
1535 : EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
1536 :
1537 : /**
1538 : * drm_atomic_helper_wait_for_flip_done - wait for all page flips to be done
1539 : * @dev: DRM device
1540 : * @old_state: atomic state object with old state structures
1541 : *
1542 : * Helper to, after atomic commit, wait for page flips on all affected
1543 : * crtcs (ie. before cleaning up old framebuffers using
1544 : * drm_atomic_helper_cleanup_planes()). Compared to
1545 : * drm_atomic_helper_wait_for_vblanks() this waits for the completion on all
1546 : * CRTCs, assuming that cursors-only updates are signalling their completion
1547 : * immediately (or using a different path).
1548 : *
1549 : * This requires that drivers use the nonblocking commit tracking support
1550 : * initialized using drm_atomic_helper_setup_commit().
1551 : */
1552 0 : void drm_atomic_helper_wait_for_flip_done(struct drm_device *dev,
1553 : struct drm_atomic_state *old_state)
1554 : {
1555 : struct drm_crtc *crtc;
1556 : int i;
1557 :
1558 0 : for (i = 0; i < dev->mode_config.num_crtc; i++) {
1559 0 : struct drm_crtc_commit *commit = old_state->crtcs[i].commit;
1560 : int ret;
1561 :
1562 0 : crtc = old_state->crtcs[i].ptr;
1563 :
1564 0 : if (!crtc || !commit)
1565 0 : continue;
1566 :
1567 0 : ret = wait_for_completion_timeout(&commit->flip_done, 10 * HZ);
1568 0 : if (ret == 0)
1569 0 : drm_err(dev, "[CRTC:%d:%s] flip_done timed out\n",
1570 : crtc->base.id, crtc->name);
1571 : }
1572 :
1573 0 : if (old_state->fake_commit)
1574 0 : complete_all(&old_state->fake_commit->flip_done);
1575 0 : }
1576 : EXPORT_SYMBOL(drm_atomic_helper_wait_for_flip_done);
1577 :
1578 : /**
1579 : * drm_atomic_helper_commit_tail - commit atomic update to hardware
1580 : * @old_state: atomic state object with old state structures
1581 : *
1582 : * This is the default implementation for the
1583 : * &drm_mode_config_helper_funcs.atomic_commit_tail hook, for drivers
1584 : * that do not support runtime_pm or do not need the CRTC to be
1585 : * enabled to perform a commit. Otherwise, see
1586 : * drm_atomic_helper_commit_tail_rpm().
1587 : *
1588 : * Note that the default ordering of how the various stages are called is to
1589 : * match the legacy modeset helper library closest.
1590 : */
1591 0 : void drm_atomic_helper_commit_tail(struct drm_atomic_state *old_state)
1592 : {
1593 0 : struct drm_device *dev = old_state->dev;
1594 :
1595 0 : drm_atomic_helper_commit_modeset_disables(dev, old_state);
1596 :
1597 0 : drm_atomic_helper_commit_planes(dev, old_state, 0);
1598 :
1599 0 : drm_atomic_helper_commit_modeset_enables(dev, old_state);
1600 :
1601 0 : drm_atomic_helper_fake_vblank(old_state);
1602 :
1603 0 : drm_atomic_helper_commit_hw_done(old_state);
1604 :
1605 0 : drm_atomic_helper_wait_for_vblanks(dev, old_state);
1606 :
1607 0 : drm_atomic_helper_cleanup_planes(dev, old_state);
1608 0 : }
1609 : EXPORT_SYMBOL(drm_atomic_helper_commit_tail);
1610 :
1611 : /**
1612 : * drm_atomic_helper_commit_tail_rpm - commit atomic update to hardware
1613 : * @old_state: new modeset state to be committed
1614 : *
1615 : * This is an alternative implementation for the
1616 : * &drm_mode_config_helper_funcs.atomic_commit_tail hook, for drivers
1617 : * that support runtime_pm or need the CRTC to be enabled to perform a
1618 : * commit. Otherwise, one should use the default implementation
1619 : * drm_atomic_helper_commit_tail().
1620 : */
1621 0 : void drm_atomic_helper_commit_tail_rpm(struct drm_atomic_state *old_state)
1622 : {
1623 0 : struct drm_device *dev = old_state->dev;
1624 :
1625 0 : drm_atomic_helper_commit_modeset_disables(dev, old_state);
1626 :
1627 0 : drm_atomic_helper_commit_modeset_enables(dev, old_state);
1628 :
1629 0 : drm_atomic_helper_commit_planes(dev, old_state,
1630 : DRM_PLANE_COMMIT_ACTIVE_ONLY);
1631 :
1632 0 : drm_atomic_helper_fake_vblank(old_state);
1633 :
1634 0 : drm_atomic_helper_commit_hw_done(old_state);
1635 :
1636 0 : drm_atomic_helper_wait_for_vblanks(dev, old_state);
1637 :
1638 0 : drm_atomic_helper_cleanup_planes(dev, old_state);
1639 0 : }
1640 : EXPORT_SYMBOL(drm_atomic_helper_commit_tail_rpm);
1641 :
1642 0 : static void commit_tail(struct drm_atomic_state *old_state)
1643 : {
1644 0 : struct drm_device *dev = old_state->dev;
1645 : const struct drm_mode_config_helper_funcs *funcs;
1646 : struct drm_crtc_state *new_crtc_state;
1647 : struct drm_crtc *crtc;
1648 : ktime_t start;
1649 : s64 commit_time_ms;
1650 0 : unsigned int i, new_self_refresh_mask = 0;
1651 :
1652 0 : funcs = dev->mode_config.helper_private;
1653 :
1654 : /*
1655 : * We're measuring the _entire_ commit, so the time will vary depending
1656 : * on how many fences and objects are involved. For the purposes of self
1657 : * refresh, this is desirable since it'll give us an idea of how
1658 : * congested things are. This will inform our decision on how often we
1659 : * should enter self refresh after idle.
1660 : *
1661 : * These times will be averaged out in the self refresh helpers to avoid
1662 : * overreacting over one outlier frame
1663 : */
1664 0 : start = ktime_get();
1665 :
1666 0 : drm_atomic_helper_wait_for_fences(dev, old_state, false);
1667 :
1668 0 : drm_atomic_helper_wait_for_dependencies(old_state);
1669 :
1670 : /*
1671 : * We cannot safely access new_crtc_state after
1672 : * drm_atomic_helper_commit_hw_done() so figure out which crtc's have
1673 : * self-refresh active beforehand:
1674 : */
1675 0 : for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i)
1676 0 : if (new_crtc_state->self_refresh_active)
1677 0 : new_self_refresh_mask |= BIT(i);
1678 :
1679 0 : if (funcs && funcs->atomic_commit_tail)
1680 0 : funcs->atomic_commit_tail(old_state);
1681 : else
1682 0 : drm_atomic_helper_commit_tail(old_state);
1683 :
1684 0 : commit_time_ms = ktime_ms_delta(ktime_get(), start);
1685 0 : if (commit_time_ms > 0)
1686 0 : drm_self_refresh_helper_update_avg_times(old_state,
1687 : (unsigned long)commit_time_ms,
1688 : new_self_refresh_mask);
1689 :
1690 0 : drm_atomic_helper_commit_cleanup_done(old_state);
1691 :
1692 0 : drm_atomic_state_put(old_state);
1693 0 : }
1694 :
1695 0 : static void commit_work(struct work_struct *work)
1696 : {
1697 0 : struct drm_atomic_state *state = container_of(work,
1698 : struct drm_atomic_state,
1699 : commit_work);
1700 0 : commit_tail(state);
1701 0 : }
1702 :
1703 : /**
1704 : * drm_atomic_helper_async_check - check if state can be committed asynchronously
1705 : * @dev: DRM device
1706 : * @state: the driver state object
1707 : *
1708 : * This helper will check if it is possible to commit the state asynchronously.
1709 : * Async commits are not supposed to swap the states like normal sync commits
1710 : * but just do in-place changes on the current state.
1711 : *
1712 : * It will return 0 if the commit can happen in an asynchronous fashion or error
1713 : * if not. Note that error just mean it can't be committed asynchronously, if it
1714 : * fails the commit should be treated like a normal synchronous commit.
1715 : */
1716 0 : int drm_atomic_helper_async_check(struct drm_device *dev,
1717 : struct drm_atomic_state *state)
1718 : {
1719 : struct drm_crtc *crtc;
1720 : struct drm_crtc_state *crtc_state;
1721 0 : struct drm_plane *plane = NULL;
1722 0 : struct drm_plane_state *old_plane_state = NULL;
1723 0 : struct drm_plane_state *new_plane_state = NULL;
1724 : const struct drm_plane_helper_funcs *funcs;
1725 0 : int i, n_planes = 0;
1726 :
1727 0 : for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
1728 0 : if (drm_atomic_crtc_needs_modeset(crtc_state))
1729 : return -EINVAL;
1730 : }
1731 :
1732 0 : for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i)
1733 0 : n_planes++;
1734 :
1735 : /* FIXME: we support only single plane updates for now */
1736 0 : if (n_planes != 1)
1737 : return -EINVAL;
1738 :
1739 0 : if (!new_plane_state->crtc ||
1740 0 : old_plane_state->crtc != new_plane_state->crtc)
1741 : return -EINVAL;
1742 :
1743 0 : funcs = plane->helper_private;
1744 0 : if (!funcs->atomic_async_update)
1745 : return -EINVAL;
1746 :
1747 0 : if (new_plane_state->fence)
1748 : return -EINVAL;
1749 :
1750 : /*
1751 : * Don't do an async update if there is an outstanding commit modifying
1752 : * the plane. This prevents our async update's changes from getting
1753 : * overridden by a previous synchronous update's state.
1754 : */
1755 0 : if (old_plane_state->commit &&
1756 0 : !try_wait_for_completion(&old_plane_state->commit->hw_done)) {
1757 0 : drm_dbg_atomic(dev,
1758 : "[PLANE:%d:%s] inflight previous commit preventing async commit\n",
1759 : plane->base.id, plane->name);
1760 0 : return -EBUSY;
1761 : }
1762 :
1763 0 : return funcs->atomic_async_check(plane, state);
1764 : }
1765 : EXPORT_SYMBOL(drm_atomic_helper_async_check);
1766 :
1767 : /**
1768 : * drm_atomic_helper_async_commit - commit state asynchronously
1769 : * @dev: DRM device
1770 : * @state: the driver state object
1771 : *
1772 : * This function commits a state asynchronously, i.e., not vblank
1773 : * synchronized. It should be used on a state only when
1774 : * drm_atomic_async_check() succeeds. Async commits are not supposed to swap
1775 : * the states like normal sync commits, but just do in-place changes on the
1776 : * current state.
1777 : *
1778 : * TODO: Implement full swap instead of doing in-place changes.
1779 : */
1780 0 : void drm_atomic_helper_async_commit(struct drm_device *dev,
1781 : struct drm_atomic_state *state)
1782 : {
1783 : struct drm_plane *plane;
1784 : struct drm_plane_state *plane_state;
1785 : const struct drm_plane_helper_funcs *funcs;
1786 : int i;
1787 :
1788 0 : for_each_new_plane_in_state(state, plane, plane_state, i) {
1789 0 : struct drm_framebuffer *new_fb = plane_state->fb;
1790 0 : struct drm_framebuffer *old_fb = plane->state->fb;
1791 :
1792 0 : funcs = plane->helper_private;
1793 0 : funcs->atomic_async_update(plane, state);
1794 :
1795 : /*
1796 : * ->atomic_async_update() is supposed to update the
1797 : * plane->state in-place, make sure at least common
1798 : * properties have been properly updated.
1799 : */
1800 0 : WARN_ON_ONCE(plane->state->fb != new_fb);
1801 0 : WARN_ON_ONCE(plane->state->crtc_x != plane_state->crtc_x);
1802 0 : WARN_ON_ONCE(plane->state->crtc_y != plane_state->crtc_y);
1803 0 : WARN_ON_ONCE(plane->state->src_x != plane_state->src_x);
1804 0 : WARN_ON_ONCE(plane->state->src_y != plane_state->src_y);
1805 :
1806 : /*
1807 : * Make sure the FBs have been swapped so that cleanups in the
1808 : * new_state performs a cleanup in the old FB.
1809 : */
1810 0 : WARN_ON_ONCE(plane_state->fb != old_fb);
1811 : }
1812 0 : }
1813 : EXPORT_SYMBOL(drm_atomic_helper_async_commit);
1814 :
1815 : /**
1816 : * drm_atomic_helper_commit - commit validated state object
1817 : * @dev: DRM device
1818 : * @state: the driver state object
1819 : * @nonblock: whether nonblocking behavior is requested.
1820 : *
1821 : * This function commits a with drm_atomic_helper_check() pre-validated state
1822 : * object. This can still fail when e.g. the framebuffer reservation fails. This
1823 : * function implements nonblocking commits, using
1824 : * drm_atomic_helper_setup_commit() and related functions.
1825 : *
1826 : * Committing the actual hardware state is done through the
1827 : * &drm_mode_config_helper_funcs.atomic_commit_tail callback, or its default
1828 : * implementation drm_atomic_helper_commit_tail().
1829 : *
1830 : * RETURNS:
1831 : * Zero for success or -errno.
1832 : */
1833 0 : int drm_atomic_helper_commit(struct drm_device *dev,
1834 : struct drm_atomic_state *state,
1835 : bool nonblock)
1836 : {
1837 : int ret;
1838 :
1839 0 : if (state->async_update) {
1840 0 : ret = drm_atomic_helper_prepare_planes(dev, state);
1841 0 : if (ret)
1842 : return ret;
1843 :
1844 0 : drm_atomic_helper_async_commit(dev, state);
1845 0 : drm_atomic_helper_cleanup_planes(dev, state);
1846 :
1847 0 : return 0;
1848 : }
1849 :
1850 0 : ret = drm_atomic_helper_setup_commit(state, nonblock);
1851 0 : if (ret)
1852 : return ret;
1853 :
1854 0 : INIT_WORK(&state->commit_work, commit_work);
1855 :
1856 0 : ret = drm_atomic_helper_prepare_planes(dev, state);
1857 0 : if (ret)
1858 : return ret;
1859 :
1860 0 : if (!nonblock) {
1861 0 : ret = drm_atomic_helper_wait_for_fences(dev, state, true);
1862 0 : if (ret)
1863 : goto err;
1864 : }
1865 :
1866 : /*
1867 : * This is the point of no return - everything below never fails except
1868 : * when the hw goes bonghits. Which means we can commit the new state on
1869 : * the software side now.
1870 : */
1871 :
1872 0 : ret = drm_atomic_helper_swap_state(state, true);
1873 0 : if (ret)
1874 : goto err;
1875 :
1876 : /*
1877 : * Everything below can be run asynchronously without the need to grab
1878 : * any modeset locks at all under one condition: It must be guaranteed
1879 : * that the asynchronous work has either been cancelled (if the driver
1880 : * supports it, which at least requires that the framebuffers get
1881 : * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
1882 : * before the new state gets committed on the software side with
1883 : * drm_atomic_helper_swap_state().
1884 : *
1885 : * This scheme allows new atomic state updates to be prepared and
1886 : * checked in parallel to the asynchronous completion of the previous
1887 : * update. Which is important since compositors need to figure out the
1888 : * composition of the next frame right after having submitted the
1889 : * current layout.
1890 : *
1891 : * NOTE: Commit work has multiple phases, first hardware commit, then
1892 : * cleanup. We want them to overlap, hence need system_unbound_wq to
1893 : * make sure work items don't artificially stall on each another.
1894 : */
1895 :
1896 0 : drm_atomic_state_get(state);
1897 0 : if (nonblock)
1898 0 : queue_work(system_unbound_wq, &state->commit_work);
1899 : else
1900 0 : commit_tail(state);
1901 :
1902 : return 0;
1903 :
1904 : err:
1905 0 : drm_atomic_helper_cleanup_planes(dev, state);
1906 0 : return ret;
1907 : }
1908 : EXPORT_SYMBOL(drm_atomic_helper_commit);
1909 :
1910 : /**
1911 : * DOC: implementing nonblocking commit
1912 : *
1913 : * Nonblocking atomic commits should use struct &drm_crtc_commit to sequence
1914 : * different operations against each another. Locks, especially struct
1915 : * &drm_modeset_lock, should not be held in worker threads or any other
1916 : * asynchronous context used to commit the hardware state.
1917 : *
1918 : * drm_atomic_helper_commit() implements the recommended sequence for
1919 : * nonblocking commits, using drm_atomic_helper_setup_commit() internally:
1920 : *
1921 : * 1. Run drm_atomic_helper_prepare_planes(). Since this can fail and we
1922 : * need to propagate out of memory/VRAM errors to userspace, it must be called
1923 : * synchronously.
1924 : *
1925 : * 2. Synchronize with any outstanding nonblocking commit worker threads which
1926 : * might be affected by the new state update. This is handled by
1927 : * drm_atomic_helper_setup_commit().
1928 : *
1929 : * Asynchronous workers need to have sufficient parallelism to be able to run
1930 : * different atomic commits on different CRTCs in parallel. The simplest way to
1931 : * achieve this is by running them on the &system_unbound_wq work queue. Note
1932 : * that drivers are not required to split up atomic commits and run an
1933 : * individual commit in parallel - userspace is supposed to do that if it cares.
1934 : * But it might be beneficial to do that for modesets, since those necessarily
1935 : * must be done as one global operation, and enabling or disabling a CRTC can
1936 : * take a long time. But even that is not required.
1937 : *
1938 : * IMPORTANT: A &drm_atomic_state update for multiple CRTCs is sequenced
1939 : * against all CRTCs therein. Therefore for atomic state updates which only flip
1940 : * planes the driver must not get the struct &drm_crtc_state of unrelated CRTCs
1941 : * in its atomic check code: This would prevent committing of atomic updates to
1942 : * multiple CRTCs in parallel. In general, adding additional state structures
1943 : * should be avoided as much as possible, because this reduces parallelism in
1944 : * (nonblocking) commits, both due to locking and due to commit sequencing
1945 : * requirements.
1946 : *
1947 : * 3. The software state is updated synchronously with
1948 : * drm_atomic_helper_swap_state(). Doing this under the protection of all modeset
1949 : * locks means concurrent callers never see inconsistent state. Note that commit
1950 : * workers do not hold any locks; their access is only coordinated through
1951 : * ordering. If workers would access state only through the pointers in the
1952 : * free-standing state objects (currently not the case for any driver) then even
1953 : * multiple pending commits could be in-flight at the same time.
1954 : *
1955 : * 4. Schedule a work item to do all subsequent steps, using the split-out
1956 : * commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and
1957 : * then cleaning up the framebuffers after the old framebuffer is no longer
1958 : * being displayed. The scheduled work should synchronize against other workers
1959 : * using the &drm_crtc_commit infrastructure as needed. See
1960 : * drm_atomic_helper_setup_commit() for more details.
1961 : */
1962 :
1963 0 : static int stall_checks(struct drm_crtc *crtc, bool nonblock)
1964 : {
1965 0 : struct drm_crtc_commit *commit, *stall_commit = NULL;
1966 0 : bool completed = true;
1967 : int i;
1968 0 : long ret = 0;
1969 :
1970 0 : spin_lock(&crtc->commit_lock);
1971 0 : i = 0;
1972 0 : list_for_each_entry(commit, &crtc->commit_list, commit_entry) {
1973 0 : if (i == 0) {
1974 0 : completed = try_wait_for_completion(&commit->flip_done);
1975 : /*
1976 : * Userspace is not allowed to get ahead of the previous
1977 : * commit with nonblocking ones.
1978 : */
1979 0 : if (!completed && nonblock) {
1980 0 : spin_unlock(&crtc->commit_lock);
1981 0 : drm_dbg_atomic(crtc->dev,
1982 : "[CRTC:%d:%s] busy with a previous commit\n",
1983 : crtc->base.id, crtc->name);
1984 :
1985 0 : return -EBUSY;
1986 : }
1987 0 : } else if (i == 1) {
1988 0 : stall_commit = drm_crtc_commit_get(commit);
1989 0 : break;
1990 : }
1991 :
1992 0 : i++;
1993 : }
1994 0 : spin_unlock(&crtc->commit_lock);
1995 :
1996 0 : if (!stall_commit)
1997 : return 0;
1998 :
1999 : /* We don't want to let commits get ahead of cleanup work too much,
2000 : * stalling on 2nd previous commit means triple-buffer won't ever stall.
2001 : */
2002 0 : ret = wait_for_completion_interruptible_timeout(&stall_commit->cleanup_done,
2003 : 10*HZ);
2004 0 : if (ret == 0)
2005 0 : drm_err(crtc->dev, "[CRTC:%d:%s] cleanup_done timed out\n",
2006 : crtc->base.id, crtc->name);
2007 :
2008 0 : drm_crtc_commit_put(stall_commit);
2009 :
2010 0 : return ret < 0 ? ret : 0;
2011 : }
2012 :
2013 0 : static void release_crtc_commit(struct completion *completion)
2014 : {
2015 0 : struct drm_crtc_commit *commit = container_of(completion,
2016 : typeof(*commit),
2017 : flip_done);
2018 :
2019 0 : drm_crtc_commit_put(commit);
2020 0 : }
2021 :
2022 0 : static void init_commit(struct drm_crtc_commit *commit, struct drm_crtc *crtc)
2023 : {
2024 0 : init_completion(&commit->flip_done);
2025 0 : init_completion(&commit->hw_done);
2026 0 : init_completion(&commit->cleanup_done);
2027 0 : INIT_LIST_HEAD(&commit->commit_entry);
2028 0 : kref_init(&commit->ref);
2029 0 : commit->crtc = crtc;
2030 0 : }
2031 :
2032 : static struct drm_crtc_commit *
2033 0 : crtc_or_fake_commit(struct drm_atomic_state *state, struct drm_crtc *crtc)
2034 : {
2035 0 : if (crtc) {
2036 : struct drm_crtc_state *new_crtc_state;
2037 :
2038 0 : new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
2039 :
2040 0 : return new_crtc_state->commit;
2041 : }
2042 :
2043 0 : if (!state->fake_commit) {
2044 0 : state->fake_commit = kzalloc(sizeof(*state->fake_commit), GFP_KERNEL);
2045 0 : if (!state->fake_commit)
2046 : return NULL;
2047 :
2048 0 : init_commit(state->fake_commit, NULL);
2049 : }
2050 :
2051 0 : return state->fake_commit;
2052 : }
2053 :
2054 : /**
2055 : * drm_atomic_helper_setup_commit - setup possibly nonblocking commit
2056 : * @state: new modeset state to be committed
2057 : * @nonblock: whether nonblocking behavior is requested.
2058 : *
2059 : * This function prepares @state to be used by the atomic helper's support for
2060 : * nonblocking commits. Drivers using the nonblocking commit infrastructure
2061 : * should always call this function from their
2062 : * &drm_mode_config_funcs.atomic_commit hook.
2063 : *
2064 : * Drivers that need to extend the commit setup to private objects can use the
2065 : * &drm_mode_config_helper_funcs.atomic_commit_setup hook.
2066 : *
2067 : * To be able to use this support drivers need to use a few more helper
2068 : * functions. drm_atomic_helper_wait_for_dependencies() must be called before
2069 : * actually committing the hardware state, and for nonblocking commits this call
2070 : * must be placed in the async worker. See also drm_atomic_helper_swap_state()
2071 : * and its stall parameter, for when a driver's commit hooks look at the
2072 : * &drm_crtc.state, &drm_plane.state or &drm_connector.state pointer directly.
2073 : *
2074 : * Completion of the hardware commit step must be signalled using
2075 : * drm_atomic_helper_commit_hw_done(). After this step the driver is not allowed
2076 : * to read or change any permanent software or hardware modeset state. The only
2077 : * exception is state protected by other means than &drm_modeset_lock locks.
2078 : * Only the free standing @state with pointers to the old state structures can
2079 : * be inspected, e.g. to clean up old buffers using
2080 : * drm_atomic_helper_cleanup_planes().
2081 : *
2082 : * At the very end, before cleaning up @state drivers must call
2083 : * drm_atomic_helper_commit_cleanup_done().
2084 : *
2085 : * This is all implemented by in drm_atomic_helper_commit(), giving drivers a
2086 : * complete and easy-to-use default implementation of the atomic_commit() hook.
2087 : *
2088 : * The tracking of asynchronously executed and still pending commits is done
2089 : * using the core structure &drm_crtc_commit.
2090 : *
2091 : * By default there's no need to clean up resources allocated by this function
2092 : * explicitly: drm_atomic_state_default_clear() will take care of that
2093 : * automatically.
2094 : *
2095 : * Returns:
2096 : *
2097 : * 0 on success. -EBUSY when userspace schedules nonblocking commits too fast,
2098 : * -ENOMEM on allocation failures and -EINTR when a signal is pending.
2099 : */
2100 0 : int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
2101 : bool nonblock)
2102 : {
2103 : struct drm_crtc *crtc;
2104 : struct drm_crtc_state *old_crtc_state, *new_crtc_state;
2105 : struct drm_connector *conn;
2106 : struct drm_connector_state *old_conn_state, *new_conn_state;
2107 : struct drm_plane *plane;
2108 : struct drm_plane_state *old_plane_state, *new_plane_state;
2109 : struct drm_crtc_commit *commit;
2110 : const struct drm_mode_config_helper_funcs *funcs;
2111 : int i, ret;
2112 :
2113 0 : funcs = state->dev->mode_config.helper_private;
2114 :
2115 0 : for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
2116 0 : commit = kzalloc(sizeof(*commit), GFP_KERNEL);
2117 0 : if (!commit)
2118 : return -ENOMEM;
2119 :
2120 0 : init_commit(commit, crtc);
2121 :
2122 0 : new_crtc_state->commit = commit;
2123 :
2124 0 : ret = stall_checks(crtc, nonblock);
2125 0 : if (ret)
2126 : return ret;
2127 :
2128 : /*
2129 : * Drivers only send out events when at least either current or
2130 : * new CRTC state is active. Complete right away if everything
2131 : * stays off.
2132 : */
2133 0 : if (!old_crtc_state->active && !new_crtc_state->active) {
2134 0 : complete_all(&commit->flip_done);
2135 0 : continue;
2136 : }
2137 :
2138 : /* Legacy cursor updates are fully unsynced. */
2139 0 : if (state->legacy_cursor_update) {
2140 0 : complete_all(&commit->flip_done);
2141 0 : continue;
2142 : }
2143 :
2144 0 : if (!new_crtc_state->event) {
2145 0 : commit->event = kzalloc(sizeof(*commit->event),
2146 : GFP_KERNEL);
2147 0 : if (!commit->event)
2148 : return -ENOMEM;
2149 :
2150 0 : new_crtc_state->event = commit->event;
2151 : }
2152 :
2153 0 : new_crtc_state->event->base.completion = &commit->flip_done;
2154 0 : new_crtc_state->event->base.completion_release = release_crtc_commit;
2155 0 : drm_crtc_commit_get(commit);
2156 :
2157 0 : commit->abort_completion = true;
2158 :
2159 0 : state->crtcs[i].commit = commit;
2160 : drm_crtc_commit_get(commit);
2161 : }
2162 :
2163 0 : for_each_oldnew_connector_in_state(state, conn, old_conn_state, new_conn_state, i) {
2164 : /*
2165 : * Userspace is not allowed to get ahead of the previous
2166 : * commit with nonblocking ones.
2167 : */
2168 0 : if (nonblock && old_conn_state->commit &&
2169 0 : !try_wait_for_completion(&old_conn_state->commit->flip_done)) {
2170 0 : drm_dbg_atomic(conn->dev,
2171 : "[CONNECTOR:%d:%s] busy with a previous commit\n",
2172 : conn->base.id, conn->name);
2173 :
2174 0 : return -EBUSY;
2175 : }
2176 :
2177 : /* Always track connectors explicitly for e.g. link retraining. */
2178 0 : commit = crtc_or_fake_commit(state, new_conn_state->crtc ?: old_conn_state->crtc);
2179 0 : if (!commit)
2180 : return -ENOMEM;
2181 :
2182 0 : new_conn_state->commit = drm_crtc_commit_get(commit);
2183 : }
2184 :
2185 0 : for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
2186 : /*
2187 : * Userspace is not allowed to get ahead of the previous
2188 : * commit with nonblocking ones.
2189 : */
2190 0 : if (nonblock && old_plane_state->commit &&
2191 0 : !try_wait_for_completion(&old_plane_state->commit->flip_done)) {
2192 0 : drm_dbg_atomic(plane->dev,
2193 : "[PLANE:%d:%s] busy with a previous commit\n",
2194 : plane->base.id, plane->name);
2195 :
2196 0 : return -EBUSY;
2197 : }
2198 :
2199 : /* Always track planes explicitly for async pageflip support. */
2200 0 : commit = crtc_or_fake_commit(state, new_plane_state->crtc ?: old_plane_state->crtc);
2201 0 : if (!commit)
2202 : return -ENOMEM;
2203 :
2204 0 : new_plane_state->commit = drm_crtc_commit_get(commit);
2205 : }
2206 :
2207 0 : if (funcs && funcs->atomic_commit_setup)
2208 0 : return funcs->atomic_commit_setup(state);
2209 :
2210 : return 0;
2211 : }
2212 : EXPORT_SYMBOL(drm_atomic_helper_setup_commit);
2213 :
2214 : /**
2215 : * drm_atomic_helper_wait_for_dependencies - wait for required preceeding commits
2216 : * @old_state: atomic state object with old state structures
2217 : *
2218 : * This function waits for all preceeding commits that touch the same CRTC as
2219 : * @old_state to both be committed to the hardware (as signalled by
2220 : * drm_atomic_helper_commit_hw_done()) and executed by the hardware (as signalled
2221 : * by calling drm_crtc_send_vblank_event() on the &drm_crtc_state.event).
2222 : *
2223 : * This is part of the atomic helper support for nonblocking commits, see
2224 : * drm_atomic_helper_setup_commit() for an overview.
2225 : */
2226 0 : void drm_atomic_helper_wait_for_dependencies(struct drm_atomic_state *old_state)
2227 : {
2228 : struct drm_crtc *crtc;
2229 : struct drm_crtc_state *old_crtc_state;
2230 : struct drm_plane *plane;
2231 : struct drm_plane_state *old_plane_state;
2232 : struct drm_connector *conn;
2233 : struct drm_connector_state *old_conn_state;
2234 : int i;
2235 : long ret;
2236 :
2237 0 : for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
2238 0 : ret = drm_crtc_commit_wait(old_crtc_state->commit);
2239 0 : if (ret)
2240 0 : drm_err(crtc->dev,
2241 : "[CRTC:%d:%s] commit wait timed out\n",
2242 : crtc->base.id, crtc->name);
2243 : }
2244 :
2245 0 : for_each_old_connector_in_state(old_state, conn, old_conn_state, i) {
2246 0 : ret = drm_crtc_commit_wait(old_conn_state->commit);
2247 0 : if (ret)
2248 0 : drm_err(conn->dev,
2249 : "[CONNECTOR:%d:%s] commit wait timed out\n",
2250 : conn->base.id, conn->name);
2251 : }
2252 :
2253 0 : for_each_old_plane_in_state(old_state, plane, old_plane_state, i) {
2254 0 : ret = drm_crtc_commit_wait(old_plane_state->commit);
2255 0 : if (ret)
2256 0 : drm_err(plane->dev,
2257 : "[PLANE:%d:%s] commit wait timed out\n",
2258 : plane->base.id, plane->name);
2259 : }
2260 0 : }
2261 : EXPORT_SYMBOL(drm_atomic_helper_wait_for_dependencies);
2262 :
2263 : /**
2264 : * drm_atomic_helper_fake_vblank - fake VBLANK events if needed
2265 : * @old_state: atomic state object with old state structures
2266 : *
2267 : * This function walks all CRTCs and fakes VBLANK events on those with
2268 : * &drm_crtc_state.no_vblank set to true and &drm_crtc_state.event != NULL.
2269 : * The primary use of this function is writeback connectors working in oneshot
2270 : * mode and faking VBLANK events. In this case they only fake the VBLANK event
2271 : * when a job is queued, and any change to the pipeline that does not touch the
2272 : * connector is leading to timeouts when calling
2273 : * drm_atomic_helper_wait_for_vblanks() or
2274 : * drm_atomic_helper_wait_for_flip_done(). In addition to writeback
2275 : * connectors, this function can also fake VBLANK events for CRTCs without
2276 : * VBLANK interrupt.
2277 : *
2278 : * This is part of the atomic helper support for nonblocking commits, see
2279 : * drm_atomic_helper_setup_commit() for an overview.
2280 : */
2281 0 : void drm_atomic_helper_fake_vblank(struct drm_atomic_state *old_state)
2282 : {
2283 : struct drm_crtc_state *new_crtc_state;
2284 : struct drm_crtc *crtc;
2285 : int i;
2286 :
2287 0 : for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
2288 : unsigned long flags;
2289 :
2290 0 : if (!new_crtc_state->no_vblank)
2291 0 : continue;
2292 :
2293 0 : spin_lock_irqsave(&old_state->dev->event_lock, flags);
2294 0 : if (new_crtc_state->event) {
2295 0 : drm_crtc_send_vblank_event(crtc,
2296 : new_crtc_state->event);
2297 0 : new_crtc_state->event = NULL;
2298 : }
2299 0 : spin_unlock_irqrestore(&old_state->dev->event_lock, flags);
2300 : }
2301 0 : }
2302 : EXPORT_SYMBOL(drm_atomic_helper_fake_vblank);
2303 :
2304 : /**
2305 : * drm_atomic_helper_commit_hw_done - setup possible nonblocking commit
2306 : * @old_state: atomic state object with old state structures
2307 : *
2308 : * This function is used to signal completion of the hardware commit step. After
2309 : * this step the driver is not allowed to read or change any permanent software
2310 : * or hardware modeset state. The only exception is state protected by other
2311 : * means than &drm_modeset_lock locks.
2312 : *
2313 : * Drivers should try to postpone any expensive or delayed cleanup work after
2314 : * this function is called.
2315 : *
2316 : * This is part of the atomic helper support for nonblocking commits, see
2317 : * drm_atomic_helper_setup_commit() for an overview.
2318 : */
2319 0 : void drm_atomic_helper_commit_hw_done(struct drm_atomic_state *old_state)
2320 : {
2321 : struct drm_crtc *crtc;
2322 : struct drm_crtc_state *old_crtc_state, *new_crtc_state;
2323 : struct drm_crtc_commit *commit;
2324 : int i;
2325 :
2326 0 : for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
2327 0 : commit = new_crtc_state->commit;
2328 0 : if (!commit)
2329 0 : continue;
2330 :
2331 : /*
2332 : * copy new_crtc_state->commit to old_crtc_state->commit,
2333 : * it's unsafe to touch new_crtc_state after hw_done,
2334 : * but we still need to do so in cleanup_done().
2335 : */
2336 0 : if (old_crtc_state->commit)
2337 0 : drm_crtc_commit_put(old_crtc_state->commit);
2338 :
2339 0 : old_crtc_state->commit = drm_crtc_commit_get(commit);
2340 :
2341 : /* backend must have consumed any event by now */
2342 0 : WARN_ON(new_crtc_state->event);
2343 0 : complete_all(&commit->hw_done);
2344 : }
2345 :
2346 0 : if (old_state->fake_commit) {
2347 0 : complete_all(&old_state->fake_commit->hw_done);
2348 0 : complete_all(&old_state->fake_commit->flip_done);
2349 : }
2350 0 : }
2351 : EXPORT_SYMBOL(drm_atomic_helper_commit_hw_done);
2352 :
2353 : /**
2354 : * drm_atomic_helper_commit_cleanup_done - signal completion of commit
2355 : * @old_state: atomic state object with old state structures
2356 : *
2357 : * This signals completion of the atomic update @old_state, including any
2358 : * cleanup work. If used, it must be called right before calling
2359 : * drm_atomic_state_put().
2360 : *
2361 : * This is part of the atomic helper support for nonblocking commits, see
2362 : * drm_atomic_helper_setup_commit() for an overview.
2363 : */
2364 0 : void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *old_state)
2365 : {
2366 : struct drm_crtc *crtc;
2367 : struct drm_crtc_state *old_crtc_state;
2368 : struct drm_crtc_commit *commit;
2369 : int i;
2370 :
2371 0 : for_each_old_crtc_in_state(old_state, crtc, old_crtc_state, i) {
2372 0 : commit = old_crtc_state->commit;
2373 0 : if (WARN_ON(!commit))
2374 0 : continue;
2375 :
2376 0 : complete_all(&commit->cleanup_done);
2377 0 : WARN_ON(!try_wait_for_completion(&commit->hw_done));
2378 :
2379 0 : spin_lock(&crtc->commit_lock);
2380 0 : list_del(&commit->commit_entry);
2381 0 : spin_unlock(&crtc->commit_lock);
2382 : }
2383 :
2384 0 : if (old_state->fake_commit) {
2385 0 : complete_all(&old_state->fake_commit->cleanup_done);
2386 0 : WARN_ON(!try_wait_for_completion(&old_state->fake_commit->hw_done));
2387 : }
2388 0 : }
2389 : EXPORT_SYMBOL(drm_atomic_helper_commit_cleanup_done);
2390 :
2391 : /**
2392 : * drm_atomic_helper_prepare_planes - prepare plane resources before commit
2393 : * @dev: DRM device
2394 : * @state: atomic state object with new state structures
2395 : *
2396 : * This function prepares plane state, specifically framebuffers, for the new
2397 : * configuration, by calling &drm_plane_helper_funcs.prepare_fb. If any failure
2398 : * is encountered this function will call &drm_plane_helper_funcs.cleanup_fb on
2399 : * any already successfully prepared framebuffer.
2400 : *
2401 : * Returns:
2402 : * 0 on success, negative error code on failure.
2403 : */
2404 0 : int drm_atomic_helper_prepare_planes(struct drm_device *dev,
2405 : struct drm_atomic_state *state)
2406 : {
2407 : struct drm_connector *connector;
2408 : struct drm_connector_state *new_conn_state;
2409 : struct drm_plane *plane;
2410 : struct drm_plane_state *new_plane_state;
2411 : int ret, i, j;
2412 :
2413 0 : for_each_new_connector_in_state(state, connector, new_conn_state, i) {
2414 0 : if (!new_conn_state->writeback_job)
2415 0 : continue;
2416 :
2417 0 : ret = drm_writeback_prepare_job(new_conn_state->writeback_job);
2418 0 : if (ret < 0)
2419 : return ret;
2420 : }
2421 :
2422 0 : for_each_new_plane_in_state(state, plane, new_plane_state, i) {
2423 : const struct drm_plane_helper_funcs *funcs;
2424 :
2425 0 : funcs = plane->helper_private;
2426 :
2427 0 : if (funcs->prepare_fb) {
2428 0 : ret = funcs->prepare_fb(plane, new_plane_state);
2429 0 : if (ret)
2430 : goto fail;
2431 : } else {
2432 0 : WARN_ON_ONCE(funcs->cleanup_fb);
2433 :
2434 0 : if (!drm_core_check_feature(dev, DRIVER_GEM))
2435 0 : continue;
2436 :
2437 0 : ret = drm_gem_plane_helper_prepare_fb(plane, new_plane_state);
2438 0 : if (ret)
2439 : goto fail;
2440 : }
2441 : }
2442 :
2443 : return 0;
2444 :
2445 : fail:
2446 0 : for_each_new_plane_in_state(state, plane, new_plane_state, j) {
2447 : const struct drm_plane_helper_funcs *funcs;
2448 :
2449 0 : if (j >= i)
2450 0 : continue;
2451 :
2452 0 : funcs = plane->helper_private;
2453 :
2454 0 : if (funcs->cleanup_fb)
2455 0 : funcs->cleanup_fb(plane, new_plane_state);
2456 : }
2457 :
2458 : return ret;
2459 : }
2460 : EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
2461 :
2462 : static bool plane_crtc_active(const struct drm_plane_state *state)
2463 : {
2464 0 : return state->crtc && state->crtc->state->active;
2465 : }
2466 :
2467 : /**
2468 : * drm_atomic_helper_commit_planes - commit plane state
2469 : * @dev: DRM device
2470 : * @old_state: atomic state object with old state structures
2471 : * @flags: flags for committing plane state
2472 : *
2473 : * This function commits the new plane state using the plane and atomic helper
2474 : * functions for planes and CRTCs. It assumes that the atomic state has already
2475 : * been pushed into the relevant object state pointers, since this step can no
2476 : * longer fail.
2477 : *
2478 : * It still requires the global state object @old_state to know which planes and
2479 : * crtcs need to be updated though.
2480 : *
2481 : * Note that this function does all plane updates across all CRTCs in one step.
2482 : * If the hardware can't support this approach look at
2483 : * drm_atomic_helper_commit_planes_on_crtc() instead.
2484 : *
2485 : * Plane parameters can be updated by applications while the associated CRTC is
2486 : * disabled. The DRM/KMS core will store the parameters in the plane state,
2487 : * which will be available to the driver when the CRTC is turned on. As a result
2488 : * most drivers don't need to be immediately notified of plane updates for a
2489 : * disabled CRTC.
2490 : *
2491 : * Unless otherwise needed, drivers are advised to set the ACTIVE_ONLY flag in
2492 : * @flags in order not to receive plane update notifications related to a
2493 : * disabled CRTC. This avoids the need to manually ignore plane updates in
2494 : * driver code when the driver and/or hardware can't or just don't need to deal
2495 : * with updates on disabled CRTCs, for example when supporting runtime PM.
2496 : *
2497 : * Drivers may set the NO_DISABLE_AFTER_MODESET flag in @flags if the relevant
2498 : * display controllers require to disable a CRTC's planes when the CRTC is
2499 : * disabled. This function would skip the &drm_plane_helper_funcs.atomic_disable
2500 : * call for a plane if the CRTC of the old plane state needs a modesetting
2501 : * operation. Of course, the drivers need to disable the planes in their CRTC
2502 : * disable callbacks since no one else would do that.
2503 : *
2504 : * The drm_atomic_helper_commit() default implementation doesn't set the
2505 : * ACTIVE_ONLY flag to most closely match the behaviour of the legacy helpers.
2506 : * This should not be copied blindly by drivers.
2507 : */
2508 0 : void drm_atomic_helper_commit_planes(struct drm_device *dev,
2509 : struct drm_atomic_state *old_state,
2510 : uint32_t flags)
2511 : {
2512 : struct drm_crtc *crtc;
2513 : struct drm_crtc_state *old_crtc_state, *new_crtc_state;
2514 : struct drm_plane *plane;
2515 : struct drm_plane_state *old_plane_state, *new_plane_state;
2516 : int i;
2517 0 : bool active_only = flags & DRM_PLANE_COMMIT_ACTIVE_ONLY;
2518 0 : bool no_disable = flags & DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET;
2519 :
2520 0 : for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
2521 : const struct drm_crtc_helper_funcs *funcs;
2522 :
2523 0 : funcs = crtc->helper_private;
2524 :
2525 0 : if (!funcs || !funcs->atomic_begin)
2526 0 : continue;
2527 :
2528 0 : if (active_only && !new_crtc_state->active)
2529 0 : continue;
2530 :
2531 0 : funcs->atomic_begin(crtc, old_state);
2532 : }
2533 :
2534 0 : for_each_oldnew_plane_in_state(old_state, plane, old_plane_state, new_plane_state, i) {
2535 : const struct drm_plane_helper_funcs *funcs;
2536 : bool disabling;
2537 :
2538 0 : funcs = plane->helper_private;
2539 :
2540 0 : if (!funcs)
2541 0 : continue;
2542 :
2543 0 : disabling = drm_atomic_plane_disabling(old_plane_state,
2544 : new_plane_state);
2545 :
2546 0 : if (active_only) {
2547 : /*
2548 : * Skip planes related to inactive CRTCs. If the plane
2549 : * is enabled use the state of the current CRTC. If the
2550 : * plane is being disabled use the state of the old
2551 : * CRTC to avoid skipping planes being disabled on an
2552 : * active CRTC.
2553 : */
2554 0 : if (!disabling && !plane_crtc_active(new_plane_state))
2555 0 : continue;
2556 0 : if (disabling && !plane_crtc_active(old_plane_state))
2557 0 : continue;
2558 : }
2559 :
2560 : /*
2561 : * Special-case disabling the plane if drivers support it.
2562 : */
2563 0 : if (disabling && funcs->atomic_disable) {
2564 : struct drm_crtc_state *crtc_state;
2565 :
2566 0 : crtc_state = old_plane_state->crtc->state;
2567 :
2568 0 : if (drm_atomic_crtc_needs_modeset(crtc_state) &&
2569 : no_disable)
2570 0 : continue;
2571 :
2572 0 : funcs->atomic_disable(plane, old_state);
2573 0 : } else if (new_plane_state->crtc || disabling) {
2574 0 : funcs->atomic_update(plane, old_state);
2575 : }
2576 : }
2577 :
2578 0 : for_each_oldnew_crtc_in_state(old_state, crtc, old_crtc_state, new_crtc_state, i) {
2579 : const struct drm_crtc_helper_funcs *funcs;
2580 :
2581 0 : funcs = crtc->helper_private;
2582 :
2583 0 : if (!funcs || !funcs->atomic_flush)
2584 0 : continue;
2585 :
2586 0 : if (active_only && !new_crtc_state->active)
2587 0 : continue;
2588 :
2589 0 : funcs->atomic_flush(crtc, old_state);
2590 : }
2591 0 : }
2592 : EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
2593 :
2594 : /**
2595 : * drm_atomic_helper_commit_planes_on_crtc - commit plane state for a CRTC
2596 : * @old_crtc_state: atomic state object with the old CRTC state
2597 : *
2598 : * This function commits the new plane state using the plane and atomic helper
2599 : * functions for planes on the specific CRTC. It assumes that the atomic state
2600 : * has already been pushed into the relevant object state pointers, since this
2601 : * step can no longer fail.
2602 : *
2603 : * This function is useful when plane updates should be done CRTC-by-CRTC
2604 : * instead of one global step like drm_atomic_helper_commit_planes() does.
2605 : *
2606 : * This function can only be savely used when planes are not allowed to move
2607 : * between different CRTCs because this function doesn't handle inter-CRTC
2608 : * dependencies. Callers need to ensure that either no such dependencies exist,
2609 : * resolve them through ordering of commit calls or through some other means.
2610 : */
2611 : void
2612 0 : drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state)
2613 : {
2614 : const struct drm_crtc_helper_funcs *crtc_funcs;
2615 0 : struct drm_crtc *crtc = old_crtc_state->crtc;
2616 0 : struct drm_atomic_state *old_state = old_crtc_state->state;
2617 0 : struct drm_crtc_state *new_crtc_state =
2618 : drm_atomic_get_new_crtc_state(old_state, crtc);
2619 : struct drm_plane *plane;
2620 : unsigned int plane_mask;
2621 :
2622 0 : plane_mask = old_crtc_state->plane_mask;
2623 0 : plane_mask |= new_crtc_state->plane_mask;
2624 :
2625 0 : crtc_funcs = crtc->helper_private;
2626 0 : if (crtc_funcs && crtc_funcs->atomic_begin)
2627 0 : crtc_funcs->atomic_begin(crtc, old_state);
2628 :
2629 0 : drm_for_each_plane_mask(plane, crtc->dev, plane_mask) {
2630 0 : struct drm_plane_state *old_plane_state =
2631 : drm_atomic_get_old_plane_state(old_state, plane);
2632 0 : struct drm_plane_state *new_plane_state =
2633 : drm_atomic_get_new_plane_state(old_state, plane);
2634 : const struct drm_plane_helper_funcs *plane_funcs;
2635 :
2636 0 : plane_funcs = plane->helper_private;
2637 :
2638 0 : if (!old_plane_state || !plane_funcs)
2639 0 : continue;
2640 :
2641 0 : WARN_ON(new_plane_state->crtc &&
2642 : new_plane_state->crtc != crtc);
2643 :
2644 0 : if (drm_atomic_plane_disabling(old_plane_state, new_plane_state) &&
2645 0 : plane_funcs->atomic_disable)
2646 0 : plane_funcs->atomic_disable(plane, old_state);
2647 0 : else if (new_plane_state->crtc ||
2648 0 : drm_atomic_plane_disabling(old_plane_state, new_plane_state))
2649 0 : plane_funcs->atomic_update(plane, old_state);
2650 : }
2651 :
2652 0 : if (crtc_funcs && crtc_funcs->atomic_flush)
2653 0 : crtc_funcs->atomic_flush(crtc, old_state);
2654 0 : }
2655 : EXPORT_SYMBOL(drm_atomic_helper_commit_planes_on_crtc);
2656 :
2657 : /**
2658 : * drm_atomic_helper_disable_planes_on_crtc - helper to disable CRTC's planes
2659 : * @old_crtc_state: atomic state object with the old CRTC state
2660 : * @atomic: if set, synchronize with CRTC's atomic_begin/flush hooks
2661 : *
2662 : * Disables all planes associated with the given CRTC. This can be
2663 : * used for instance in the CRTC helper atomic_disable callback to disable
2664 : * all planes.
2665 : *
2666 : * If the atomic-parameter is set the function calls the CRTC's
2667 : * atomic_begin hook before and atomic_flush hook after disabling the
2668 : * planes.
2669 : *
2670 : * It is a bug to call this function without having implemented the
2671 : * &drm_plane_helper_funcs.atomic_disable plane hook.
2672 : */
2673 : void
2674 0 : drm_atomic_helper_disable_planes_on_crtc(struct drm_crtc_state *old_crtc_state,
2675 : bool atomic)
2676 : {
2677 0 : struct drm_crtc *crtc = old_crtc_state->crtc;
2678 0 : const struct drm_crtc_helper_funcs *crtc_funcs =
2679 : crtc->helper_private;
2680 : struct drm_plane *plane;
2681 :
2682 0 : if (atomic && crtc_funcs && crtc_funcs->atomic_begin)
2683 0 : crtc_funcs->atomic_begin(crtc, NULL);
2684 :
2685 0 : drm_atomic_crtc_state_for_each_plane(plane, old_crtc_state) {
2686 0 : const struct drm_plane_helper_funcs *plane_funcs =
2687 : plane->helper_private;
2688 :
2689 0 : if (!plane_funcs)
2690 0 : continue;
2691 :
2692 0 : WARN_ON(!plane_funcs->atomic_disable);
2693 0 : if (plane_funcs->atomic_disable)
2694 0 : plane_funcs->atomic_disable(plane, NULL);
2695 : }
2696 :
2697 0 : if (atomic && crtc_funcs && crtc_funcs->atomic_flush)
2698 0 : crtc_funcs->atomic_flush(crtc, NULL);
2699 0 : }
2700 : EXPORT_SYMBOL(drm_atomic_helper_disable_planes_on_crtc);
2701 :
2702 : /**
2703 : * drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
2704 : * @dev: DRM device
2705 : * @old_state: atomic state object with old state structures
2706 : *
2707 : * This function cleans up plane state, specifically framebuffers, from the old
2708 : * configuration. Hence the old configuration must be perserved in @old_state to
2709 : * be able to call this function.
2710 : *
2711 : * This function must also be called on the new state when the atomic update
2712 : * fails at any point after calling drm_atomic_helper_prepare_planes().
2713 : */
2714 0 : void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
2715 : struct drm_atomic_state *old_state)
2716 : {
2717 : struct drm_plane *plane;
2718 : struct drm_plane_state *old_plane_state, *new_plane_state;
2719 : int i;
2720 :
2721 0 : for_each_oldnew_plane_in_state(old_state, plane, old_plane_state, new_plane_state, i) {
2722 : const struct drm_plane_helper_funcs *funcs;
2723 : struct drm_plane_state *plane_state;
2724 :
2725 : /*
2726 : * This might be called before swapping when commit is aborted,
2727 : * in which case we have to cleanup the new state.
2728 : */
2729 0 : if (old_plane_state == plane->state)
2730 : plane_state = new_plane_state;
2731 : else
2732 0 : plane_state = old_plane_state;
2733 :
2734 0 : funcs = plane->helper_private;
2735 :
2736 0 : if (funcs->cleanup_fb)
2737 0 : funcs->cleanup_fb(plane, plane_state);
2738 : }
2739 0 : }
2740 : EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
2741 :
2742 : /**
2743 : * drm_atomic_helper_swap_state - store atomic state into current sw state
2744 : * @state: atomic state
2745 : * @stall: stall for preceding commits
2746 : *
2747 : * This function stores the atomic state into the current state pointers in all
2748 : * driver objects. It should be called after all failing steps have been done
2749 : * and succeeded, but before the actual hardware state is committed.
2750 : *
2751 : * For cleanup and error recovery the current state for all changed objects will
2752 : * be swapped into @state.
2753 : *
2754 : * With that sequence it fits perfectly into the plane prepare/cleanup sequence:
2755 : *
2756 : * 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state.
2757 : *
2758 : * 2. Do any other steps that might fail.
2759 : *
2760 : * 3. Put the staged state into the current state pointers with this function.
2761 : *
2762 : * 4. Actually commit the hardware state.
2763 : *
2764 : * 5. Call drm_atomic_helper_cleanup_planes() with @state, which since step 3
2765 : * contains the old state. Also do any other cleanup required with that state.
2766 : *
2767 : * @stall must be set when nonblocking commits for this driver directly access
2768 : * the &drm_plane.state, &drm_crtc.state or &drm_connector.state pointer. With
2769 : * the current atomic helpers this is almost always the case, since the helpers
2770 : * don't pass the right state structures to the callbacks.
2771 : *
2772 : * Returns:
2773 : *
2774 : * Returns 0 on success. Can return -ERESTARTSYS when @stall is true and the
2775 : * waiting for the previous commits has been interrupted.
2776 : */
2777 0 : int drm_atomic_helper_swap_state(struct drm_atomic_state *state,
2778 : bool stall)
2779 : {
2780 : int i, ret;
2781 : struct drm_connector *connector;
2782 : struct drm_connector_state *old_conn_state, *new_conn_state;
2783 : struct drm_crtc *crtc;
2784 : struct drm_crtc_state *old_crtc_state, *new_crtc_state;
2785 : struct drm_plane *plane;
2786 : struct drm_plane_state *old_plane_state, *new_plane_state;
2787 : struct drm_crtc_commit *commit;
2788 : struct drm_private_obj *obj;
2789 : struct drm_private_state *old_obj_state, *new_obj_state;
2790 :
2791 0 : if (stall) {
2792 : /*
2793 : * We have to stall for hw_done here before
2794 : * drm_atomic_helper_wait_for_dependencies() because flip
2795 : * depth > 1 is not yet supported by all drivers. As long as
2796 : * obj->state is directly dereferenced anywhere in the drivers
2797 : * atomic_commit_tail function, then it's unsafe to swap state
2798 : * before drm_atomic_helper_commit_hw_done() is called.
2799 : */
2800 :
2801 0 : for_each_old_crtc_in_state(state, crtc, old_crtc_state, i) {
2802 0 : commit = old_crtc_state->commit;
2803 :
2804 0 : if (!commit)
2805 0 : continue;
2806 :
2807 0 : ret = wait_for_completion_interruptible(&commit->hw_done);
2808 0 : if (ret)
2809 : return ret;
2810 : }
2811 :
2812 0 : for_each_old_connector_in_state(state, connector, old_conn_state, i) {
2813 0 : commit = old_conn_state->commit;
2814 :
2815 0 : if (!commit)
2816 0 : continue;
2817 :
2818 0 : ret = wait_for_completion_interruptible(&commit->hw_done);
2819 0 : if (ret)
2820 : return ret;
2821 : }
2822 :
2823 0 : for_each_old_plane_in_state(state, plane, old_plane_state, i) {
2824 0 : commit = old_plane_state->commit;
2825 :
2826 0 : if (!commit)
2827 0 : continue;
2828 :
2829 0 : ret = wait_for_completion_interruptible(&commit->hw_done);
2830 0 : if (ret)
2831 : return ret;
2832 : }
2833 : }
2834 :
2835 0 : for_each_oldnew_connector_in_state(state, connector, old_conn_state, new_conn_state, i) {
2836 0 : WARN_ON(connector->state != old_conn_state);
2837 :
2838 0 : old_conn_state->state = state;
2839 0 : new_conn_state->state = NULL;
2840 :
2841 0 : state->connectors[i].state = old_conn_state;
2842 0 : connector->state = new_conn_state;
2843 : }
2844 :
2845 0 : for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
2846 0 : WARN_ON(crtc->state != old_crtc_state);
2847 :
2848 0 : old_crtc_state->state = state;
2849 0 : new_crtc_state->state = NULL;
2850 :
2851 0 : state->crtcs[i].state = old_crtc_state;
2852 0 : crtc->state = new_crtc_state;
2853 :
2854 0 : if (new_crtc_state->commit) {
2855 0 : spin_lock(&crtc->commit_lock);
2856 0 : list_add(&new_crtc_state->commit->commit_entry,
2857 : &crtc->commit_list);
2858 0 : spin_unlock(&crtc->commit_lock);
2859 :
2860 0 : new_crtc_state->commit->event = NULL;
2861 : }
2862 : }
2863 :
2864 0 : for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
2865 0 : WARN_ON(plane->state != old_plane_state);
2866 :
2867 0 : old_plane_state->state = state;
2868 0 : new_plane_state->state = NULL;
2869 :
2870 0 : state->planes[i].state = old_plane_state;
2871 0 : plane->state = new_plane_state;
2872 : }
2873 :
2874 0 : for_each_oldnew_private_obj_in_state(state, obj, old_obj_state, new_obj_state, i) {
2875 0 : WARN_ON(obj->state != old_obj_state);
2876 :
2877 0 : old_obj_state->state = state;
2878 0 : new_obj_state->state = NULL;
2879 :
2880 0 : state->private_objs[i].state = old_obj_state;
2881 0 : obj->state = new_obj_state;
2882 : }
2883 :
2884 : return 0;
2885 : }
2886 : EXPORT_SYMBOL(drm_atomic_helper_swap_state);
2887 :
2888 : /**
2889 : * drm_atomic_helper_update_plane - Helper for primary plane update using atomic
2890 : * @plane: plane object to update
2891 : * @crtc: owning CRTC of owning plane
2892 : * @fb: framebuffer to flip onto plane
2893 : * @crtc_x: x offset of primary plane on @crtc
2894 : * @crtc_y: y offset of primary plane on @crtc
2895 : * @crtc_w: width of primary plane rectangle on @crtc
2896 : * @crtc_h: height of primary plane rectangle on @crtc
2897 : * @src_x: x offset of @fb for panning
2898 : * @src_y: y offset of @fb for panning
2899 : * @src_w: width of source rectangle in @fb
2900 : * @src_h: height of source rectangle in @fb
2901 : * @ctx: lock acquire context
2902 : *
2903 : * Provides a default plane update handler using the atomic driver interface.
2904 : *
2905 : * RETURNS:
2906 : * Zero on success, error code on failure
2907 : */
2908 0 : int drm_atomic_helper_update_plane(struct drm_plane *plane,
2909 : struct drm_crtc *crtc,
2910 : struct drm_framebuffer *fb,
2911 : int crtc_x, int crtc_y,
2912 : unsigned int crtc_w, unsigned int crtc_h,
2913 : uint32_t src_x, uint32_t src_y,
2914 : uint32_t src_w, uint32_t src_h,
2915 : struct drm_modeset_acquire_ctx *ctx)
2916 : {
2917 : struct drm_atomic_state *state;
2918 : struct drm_plane_state *plane_state;
2919 0 : int ret = 0;
2920 :
2921 0 : state = drm_atomic_state_alloc(plane->dev);
2922 0 : if (!state)
2923 : return -ENOMEM;
2924 :
2925 0 : state->acquire_ctx = ctx;
2926 0 : plane_state = drm_atomic_get_plane_state(state, plane);
2927 0 : if (IS_ERR(plane_state)) {
2928 0 : ret = PTR_ERR(plane_state);
2929 0 : goto fail;
2930 : }
2931 :
2932 0 : ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
2933 0 : if (ret != 0)
2934 : goto fail;
2935 0 : drm_atomic_set_fb_for_plane(plane_state, fb);
2936 0 : plane_state->crtc_x = crtc_x;
2937 0 : plane_state->crtc_y = crtc_y;
2938 0 : plane_state->crtc_w = crtc_w;
2939 0 : plane_state->crtc_h = crtc_h;
2940 0 : plane_state->src_x = src_x;
2941 0 : plane_state->src_y = src_y;
2942 0 : plane_state->src_w = src_w;
2943 0 : plane_state->src_h = src_h;
2944 :
2945 0 : if (plane == crtc->cursor)
2946 0 : state->legacy_cursor_update = true;
2947 :
2948 0 : ret = drm_atomic_commit(state);
2949 : fail:
2950 0 : drm_atomic_state_put(state);
2951 0 : return ret;
2952 : }
2953 : EXPORT_SYMBOL(drm_atomic_helper_update_plane);
2954 :
2955 : /**
2956 : * drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic
2957 : * @plane: plane to disable
2958 : * @ctx: lock acquire context
2959 : *
2960 : * Provides a default plane disable handler using the atomic driver interface.
2961 : *
2962 : * RETURNS:
2963 : * Zero on success, error code on failure
2964 : */
2965 0 : int drm_atomic_helper_disable_plane(struct drm_plane *plane,
2966 : struct drm_modeset_acquire_ctx *ctx)
2967 : {
2968 : struct drm_atomic_state *state;
2969 : struct drm_plane_state *plane_state;
2970 0 : int ret = 0;
2971 :
2972 0 : state = drm_atomic_state_alloc(plane->dev);
2973 0 : if (!state)
2974 : return -ENOMEM;
2975 :
2976 0 : state->acquire_ctx = ctx;
2977 0 : plane_state = drm_atomic_get_plane_state(state, plane);
2978 0 : if (IS_ERR(plane_state)) {
2979 0 : ret = PTR_ERR(plane_state);
2980 0 : goto fail;
2981 : }
2982 :
2983 0 : if (plane_state->crtc && plane_state->crtc->cursor == plane)
2984 0 : plane_state->state->legacy_cursor_update = true;
2985 :
2986 0 : ret = __drm_atomic_helper_disable_plane(plane, plane_state);
2987 0 : if (ret != 0)
2988 : goto fail;
2989 :
2990 0 : ret = drm_atomic_commit(state);
2991 : fail:
2992 0 : drm_atomic_state_put(state);
2993 0 : return ret;
2994 : }
2995 : EXPORT_SYMBOL(drm_atomic_helper_disable_plane);
2996 :
2997 : /**
2998 : * drm_atomic_helper_set_config - set a new config from userspace
2999 : * @set: mode set configuration
3000 : * @ctx: lock acquisition context
3001 : *
3002 : * Provides a default CRTC set_config handler using the atomic driver interface.
3003 : *
3004 : * NOTE: For backwards compatibility with old userspace this automatically
3005 : * resets the "link-status" property to GOOD, to force any link
3006 : * re-training. The SETCRTC ioctl does not define whether an update does
3007 : * need a full modeset or just a plane update, hence we're allowed to do
3008 : * that. See also drm_connector_set_link_status_property().
3009 : *
3010 : * Returns:
3011 : * Returns 0 on success, negative errno numbers on failure.
3012 : */
3013 0 : int drm_atomic_helper_set_config(struct drm_mode_set *set,
3014 : struct drm_modeset_acquire_ctx *ctx)
3015 : {
3016 : struct drm_atomic_state *state;
3017 0 : struct drm_crtc *crtc = set->crtc;
3018 0 : int ret = 0;
3019 :
3020 0 : state = drm_atomic_state_alloc(crtc->dev);
3021 0 : if (!state)
3022 : return -ENOMEM;
3023 :
3024 0 : state->acquire_ctx = ctx;
3025 0 : ret = __drm_atomic_helper_set_config(set, state);
3026 0 : if (ret != 0)
3027 : goto fail;
3028 :
3029 0 : ret = handle_conflicting_encoders(state, true);
3030 0 : if (ret)
3031 : goto fail;
3032 :
3033 0 : ret = drm_atomic_commit(state);
3034 :
3035 : fail:
3036 0 : drm_atomic_state_put(state);
3037 0 : return ret;
3038 : }
3039 : EXPORT_SYMBOL(drm_atomic_helper_set_config);
3040 :
3041 : /**
3042 : * drm_atomic_helper_disable_all - disable all currently active outputs
3043 : * @dev: DRM device
3044 : * @ctx: lock acquisition context
3045 : *
3046 : * Loops through all connectors, finding those that aren't turned off and then
3047 : * turns them off by setting their DPMS mode to OFF and deactivating the CRTC
3048 : * that they are connected to.
3049 : *
3050 : * This is used for example in suspend/resume to disable all currently active
3051 : * functions when suspending. If you just want to shut down everything at e.g.
3052 : * driver unload, look at drm_atomic_helper_shutdown().
3053 : *
3054 : * Note that if callers haven't already acquired all modeset locks this might
3055 : * return -EDEADLK, which must be handled by calling drm_modeset_backoff().
3056 : *
3057 : * Returns:
3058 : * 0 on success or a negative error code on failure.
3059 : *
3060 : * See also:
3061 : * drm_atomic_helper_suspend(), drm_atomic_helper_resume() and
3062 : * drm_atomic_helper_shutdown().
3063 : */
3064 0 : int drm_atomic_helper_disable_all(struct drm_device *dev,
3065 : struct drm_modeset_acquire_ctx *ctx)
3066 : {
3067 : struct drm_atomic_state *state;
3068 : struct drm_connector_state *conn_state;
3069 : struct drm_connector *conn;
3070 : struct drm_plane_state *plane_state;
3071 : struct drm_plane *plane;
3072 : struct drm_crtc_state *crtc_state;
3073 : struct drm_crtc *crtc;
3074 : int ret, i;
3075 :
3076 0 : state = drm_atomic_state_alloc(dev);
3077 0 : if (!state)
3078 : return -ENOMEM;
3079 :
3080 0 : state->acquire_ctx = ctx;
3081 :
3082 0 : drm_for_each_crtc(crtc, dev) {
3083 0 : crtc_state = drm_atomic_get_crtc_state(state, crtc);
3084 0 : if (IS_ERR(crtc_state)) {
3085 0 : ret = PTR_ERR(crtc_state);
3086 0 : goto free;
3087 : }
3088 :
3089 0 : crtc_state->active = false;
3090 :
3091 0 : ret = drm_atomic_set_mode_prop_for_crtc(crtc_state, NULL);
3092 0 : if (ret < 0)
3093 : goto free;
3094 :
3095 0 : ret = drm_atomic_add_affected_planes(state, crtc);
3096 0 : if (ret < 0)
3097 : goto free;
3098 :
3099 0 : ret = drm_atomic_add_affected_connectors(state, crtc);
3100 0 : if (ret < 0)
3101 : goto free;
3102 : }
3103 :
3104 0 : for_each_new_connector_in_state(state, conn, conn_state, i) {
3105 0 : ret = drm_atomic_set_crtc_for_connector(conn_state, NULL);
3106 0 : if (ret < 0)
3107 : goto free;
3108 : }
3109 :
3110 0 : for_each_new_plane_in_state(state, plane, plane_state, i) {
3111 0 : ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
3112 0 : if (ret < 0)
3113 : goto free;
3114 :
3115 0 : drm_atomic_set_fb_for_plane(plane_state, NULL);
3116 : }
3117 :
3118 0 : ret = drm_atomic_commit(state);
3119 : free:
3120 0 : drm_atomic_state_put(state);
3121 0 : return ret;
3122 : }
3123 : EXPORT_SYMBOL(drm_atomic_helper_disable_all);
3124 :
3125 : /**
3126 : * drm_atomic_helper_shutdown - shutdown all CRTC
3127 : * @dev: DRM device
3128 : *
3129 : * This shuts down all CRTC, which is useful for driver unloading. Shutdown on
3130 : * suspend should instead be handled with drm_atomic_helper_suspend(), since
3131 : * that also takes a snapshot of the modeset state to be restored on resume.
3132 : *
3133 : * This is just a convenience wrapper around drm_atomic_helper_disable_all(),
3134 : * and it is the atomic version of drm_crtc_force_disable_all().
3135 : */
3136 0 : void drm_atomic_helper_shutdown(struct drm_device *dev)
3137 : {
3138 : struct drm_modeset_acquire_ctx ctx;
3139 : int ret;
3140 :
3141 0 : DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
3142 :
3143 0 : ret = drm_atomic_helper_disable_all(dev, &ctx);
3144 0 : if (ret)
3145 0 : drm_err(dev,
3146 : "Disabling all crtc's during unload failed with %i\n",
3147 : ret);
3148 :
3149 0 : DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
3150 0 : }
3151 : EXPORT_SYMBOL(drm_atomic_helper_shutdown);
3152 :
3153 : /**
3154 : * drm_atomic_helper_duplicate_state - duplicate an atomic state object
3155 : * @dev: DRM device
3156 : * @ctx: lock acquisition context
3157 : *
3158 : * Makes a copy of the current atomic state by looping over all objects and
3159 : * duplicating their respective states. This is used for example by suspend/
3160 : * resume support code to save the state prior to suspend such that it can
3161 : * be restored upon resume.
3162 : *
3163 : * Note that this treats atomic state as persistent between save and restore.
3164 : * Drivers must make sure that this is possible and won't result in confusion
3165 : * or erroneous behaviour.
3166 : *
3167 : * Note that if callers haven't already acquired all modeset locks this might
3168 : * return -EDEADLK, which must be handled by calling drm_modeset_backoff().
3169 : *
3170 : * Returns:
3171 : * A pointer to the copy of the atomic state object on success or an
3172 : * ERR_PTR()-encoded error code on failure.
3173 : *
3174 : * See also:
3175 : * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
3176 : */
3177 : struct drm_atomic_state *
3178 0 : drm_atomic_helper_duplicate_state(struct drm_device *dev,
3179 : struct drm_modeset_acquire_ctx *ctx)
3180 : {
3181 : struct drm_atomic_state *state;
3182 : struct drm_connector *conn;
3183 : struct drm_connector_list_iter conn_iter;
3184 : struct drm_plane *plane;
3185 : struct drm_crtc *crtc;
3186 0 : int err = 0;
3187 :
3188 0 : state = drm_atomic_state_alloc(dev);
3189 0 : if (!state)
3190 : return ERR_PTR(-ENOMEM);
3191 :
3192 0 : state->acquire_ctx = ctx;
3193 0 : state->duplicated = true;
3194 :
3195 0 : drm_for_each_crtc(crtc, dev) {
3196 : struct drm_crtc_state *crtc_state;
3197 :
3198 0 : crtc_state = drm_atomic_get_crtc_state(state, crtc);
3199 0 : if (IS_ERR(crtc_state)) {
3200 0 : err = PTR_ERR(crtc_state);
3201 0 : goto free;
3202 : }
3203 : }
3204 :
3205 0 : drm_for_each_plane(plane, dev) {
3206 : struct drm_plane_state *plane_state;
3207 :
3208 0 : plane_state = drm_atomic_get_plane_state(state, plane);
3209 0 : if (IS_ERR(plane_state)) {
3210 0 : err = PTR_ERR(plane_state);
3211 0 : goto free;
3212 : }
3213 : }
3214 :
3215 0 : drm_connector_list_iter_begin(dev, &conn_iter);
3216 0 : drm_for_each_connector_iter(conn, &conn_iter) {
3217 : struct drm_connector_state *conn_state;
3218 :
3219 0 : conn_state = drm_atomic_get_connector_state(state, conn);
3220 0 : if (IS_ERR(conn_state)) {
3221 0 : err = PTR_ERR(conn_state);
3222 0 : drm_connector_list_iter_end(&conn_iter);
3223 0 : goto free;
3224 : }
3225 : }
3226 0 : drm_connector_list_iter_end(&conn_iter);
3227 :
3228 : /* clear the acquire context so that it isn't accidentally reused */
3229 0 : state->acquire_ctx = NULL;
3230 :
3231 : free:
3232 0 : if (err < 0) {
3233 0 : drm_atomic_state_put(state);
3234 0 : state = ERR_PTR(err);
3235 : }
3236 :
3237 : return state;
3238 : }
3239 : EXPORT_SYMBOL(drm_atomic_helper_duplicate_state);
3240 :
3241 : /**
3242 : * drm_atomic_helper_suspend - subsystem-level suspend helper
3243 : * @dev: DRM device
3244 : *
3245 : * Duplicates the current atomic state, disables all active outputs and then
3246 : * returns a pointer to the original atomic state to the caller. Drivers can
3247 : * pass this pointer to the drm_atomic_helper_resume() helper upon resume to
3248 : * restore the output configuration that was active at the time the system
3249 : * entered suspend.
3250 : *
3251 : * Note that it is potentially unsafe to use this. The atomic state object
3252 : * returned by this function is assumed to be persistent. Drivers must ensure
3253 : * that this holds true. Before calling this function, drivers must make sure
3254 : * to suspend fbdev emulation so that nothing can be using the device.
3255 : *
3256 : * Returns:
3257 : * A pointer to a copy of the state before suspend on success or an ERR_PTR()-
3258 : * encoded error code on failure. Drivers should store the returned atomic
3259 : * state object and pass it to the drm_atomic_helper_resume() helper upon
3260 : * resume.
3261 : *
3262 : * See also:
3263 : * drm_atomic_helper_duplicate_state(), drm_atomic_helper_disable_all(),
3264 : * drm_atomic_helper_resume(), drm_atomic_helper_commit_duplicated_state()
3265 : */
3266 0 : struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev)
3267 : {
3268 : struct drm_modeset_acquire_ctx ctx;
3269 : struct drm_atomic_state *state;
3270 : int err;
3271 :
3272 : /* This can never be returned, but it makes the compiler happy */
3273 0 : state = ERR_PTR(-EINVAL);
3274 :
3275 0 : DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, err);
3276 :
3277 0 : state = drm_atomic_helper_duplicate_state(dev, &ctx);
3278 0 : if (IS_ERR(state))
3279 : goto unlock;
3280 :
3281 0 : err = drm_atomic_helper_disable_all(dev, &ctx);
3282 0 : if (err < 0) {
3283 0 : drm_atomic_state_put(state);
3284 0 : state = ERR_PTR(err);
3285 0 : goto unlock;
3286 : }
3287 :
3288 : unlock:
3289 0 : DRM_MODESET_LOCK_ALL_END(dev, ctx, err);
3290 0 : if (err)
3291 0 : return ERR_PTR(err);
3292 :
3293 : return state;
3294 : }
3295 : EXPORT_SYMBOL(drm_atomic_helper_suspend);
3296 :
3297 : /**
3298 : * drm_atomic_helper_commit_duplicated_state - commit duplicated state
3299 : * @state: duplicated atomic state to commit
3300 : * @ctx: pointer to acquire_ctx to use for commit.
3301 : *
3302 : * The state returned by drm_atomic_helper_duplicate_state() and
3303 : * drm_atomic_helper_suspend() is partially invalid, and needs to
3304 : * be fixed up before commit.
3305 : *
3306 : * Returns:
3307 : * 0 on success or a negative error code on failure.
3308 : *
3309 : * See also:
3310 : * drm_atomic_helper_suspend()
3311 : */
3312 0 : int drm_atomic_helper_commit_duplicated_state(struct drm_atomic_state *state,
3313 : struct drm_modeset_acquire_ctx *ctx)
3314 : {
3315 : int i, ret;
3316 : struct drm_plane *plane;
3317 : struct drm_plane_state *new_plane_state;
3318 : struct drm_connector *connector;
3319 : struct drm_connector_state *new_conn_state;
3320 : struct drm_crtc *crtc;
3321 : struct drm_crtc_state *new_crtc_state;
3322 :
3323 0 : state->acquire_ctx = ctx;
3324 :
3325 0 : for_each_new_plane_in_state(state, plane, new_plane_state, i)
3326 0 : state->planes[i].old_state = plane->state;
3327 :
3328 0 : for_each_new_crtc_in_state(state, crtc, new_crtc_state, i)
3329 0 : state->crtcs[i].old_state = crtc->state;
3330 :
3331 0 : for_each_new_connector_in_state(state, connector, new_conn_state, i)
3332 0 : state->connectors[i].old_state = connector->state;
3333 :
3334 0 : ret = drm_atomic_commit(state);
3335 :
3336 0 : state->acquire_ctx = NULL;
3337 :
3338 0 : return ret;
3339 : }
3340 : EXPORT_SYMBOL(drm_atomic_helper_commit_duplicated_state);
3341 :
3342 : /**
3343 : * drm_atomic_helper_resume - subsystem-level resume helper
3344 : * @dev: DRM device
3345 : * @state: atomic state to resume to
3346 : *
3347 : * Calls drm_mode_config_reset() to synchronize hardware and software states,
3348 : * grabs all modeset locks and commits the atomic state object. This can be
3349 : * used in conjunction with the drm_atomic_helper_suspend() helper to
3350 : * implement suspend/resume for drivers that support atomic mode-setting.
3351 : *
3352 : * Returns:
3353 : * 0 on success or a negative error code on failure.
3354 : *
3355 : * See also:
3356 : * drm_atomic_helper_suspend()
3357 : */
3358 0 : int drm_atomic_helper_resume(struct drm_device *dev,
3359 : struct drm_atomic_state *state)
3360 : {
3361 : struct drm_modeset_acquire_ctx ctx;
3362 : int err;
3363 :
3364 0 : drm_mode_config_reset(dev);
3365 :
3366 0 : DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, err);
3367 :
3368 0 : err = drm_atomic_helper_commit_duplicated_state(state, &ctx);
3369 :
3370 0 : DRM_MODESET_LOCK_ALL_END(dev, ctx, err);
3371 0 : drm_atomic_state_put(state);
3372 :
3373 0 : return err;
3374 : }
3375 : EXPORT_SYMBOL(drm_atomic_helper_resume);
3376 :
3377 0 : static int page_flip_common(struct drm_atomic_state *state,
3378 : struct drm_crtc *crtc,
3379 : struct drm_framebuffer *fb,
3380 : struct drm_pending_vblank_event *event,
3381 : uint32_t flags)
3382 : {
3383 0 : struct drm_plane *plane = crtc->primary;
3384 : struct drm_plane_state *plane_state;
3385 : struct drm_crtc_state *crtc_state;
3386 0 : int ret = 0;
3387 :
3388 0 : crtc_state = drm_atomic_get_crtc_state(state, crtc);
3389 0 : if (IS_ERR(crtc_state))
3390 0 : return PTR_ERR(crtc_state);
3391 :
3392 0 : crtc_state->event = event;
3393 0 : crtc_state->async_flip = flags & DRM_MODE_PAGE_FLIP_ASYNC;
3394 :
3395 0 : plane_state = drm_atomic_get_plane_state(state, plane);
3396 0 : if (IS_ERR(plane_state))
3397 0 : return PTR_ERR(plane_state);
3398 :
3399 0 : ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
3400 0 : if (ret != 0)
3401 : return ret;
3402 0 : drm_atomic_set_fb_for_plane(plane_state, fb);
3403 :
3404 : /* Make sure we don't accidentally do a full modeset. */
3405 0 : state->allow_modeset = false;
3406 0 : if (!crtc_state->active) {
3407 0 : drm_dbg_atomic(crtc->dev,
3408 : "[CRTC:%d:%s] disabled, rejecting legacy flip\n",
3409 : crtc->base.id, crtc->name);
3410 0 : return -EINVAL;
3411 : }
3412 :
3413 : return ret;
3414 : }
3415 :
3416 : /**
3417 : * drm_atomic_helper_page_flip - execute a legacy page flip
3418 : * @crtc: DRM CRTC
3419 : * @fb: DRM framebuffer
3420 : * @event: optional DRM event to signal upon completion
3421 : * @flags: flip flags for non-vblank sync'ed updates
3422 : * @ctx: lock acquisition context
3423 : *
3424 : * Provides a default &drm_crtc_funcs.page_flip implementation
3425 : * using the atomic driver interface.
3426 : *
3427 : * Returns:
3428 : * Returns 0 on success, negative errno numbers on failure.
3429 : *
3430 : * See also:
3431 : * drm_atomic_helper_page_flip_target()
3432 : */
3433 0 : int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
3434 : struct drm_framebuffer *fb,
3435 : struct drm_pending_vblank_event *event,
3436 : uint32_t flags,
3437 : struct drm_modeset_acquire_ctx *ctx)
3438 : {
3439 0 : struct drm_plane *plane = crtc->primary;
3440 : struct drm_atomic_state *state;
3441 0 : int ret = 0;
3442 :
3443 0 : state = drm_atomic_state_alloc(plane->dev);
3444 0 : if (!state)
3445 : return -ENOMEM;
3446 :
3447 0 : state->acquire_ctx = ctx;
3448 :
3449 0 : ret = page_flip_common(state, crtc, fb, event, flags);
3450 0 : if (ret != 0)
3451 : goto fail;
3452 :
3453 0 : ret = drm_atomic_nonblocking_commit(state);
3454 : fail:
3455 0 : drm_atomic_state_put(state);
3456 0 : return ret;
3457 : }
3458 : EXPORT_SYMBOL(drm_atomic_helper_page_flip);
3459 :
3460 : /**
3461 : * drm_atomic_helper_page_flip_target - do page flip on target vblank period.
3462 : * @crtc: DRM CRTC
3463 : * @fb: DRM framebuffer
3464 : * @event: optional DRM event to signal upon completion
3465 : * @flags: flip flags for non-vblank sync'ed updates
3466 : * @target: specifying the target vblank period when the flip to take effect
3467 : * @ctx: lock acquisition context
3468 : *
3469 : * Provides a default &drm_crtc_funcs.page_flip_target implementation.
3470 : * Similar to drm_atomic_helper_page_flip() with extra parameter to specify
3471 : * target vblank period to flip.
3472 : *
3473 : * Returns:
3474 : * Returns 0 on success, negative errno numbers on failure.
3475 : */
3476 0 : int drm_atomic_helper_page_flip_target(struct drm_crtc *crtc,
3477 : struct drm_framebuffer *fb,
3478 : struct drm_pending_vblank_event *event,
3479 : uint32_t flags,
3480 : uint32_t target,
3481 : struct drm_modeset_acquire_ctx *ctx)
3482 : {
3483 0 : struct drm_plane *plane = crtc->primary;
3484 : struct drm_atomic_state *state;
3485 : struct drm_crtc_state *crtc_state;
3486 0 : int ret = 0;
3487 :
3488 0 : state = drm_atomic_state_alloc(plane->dev);
3489 0 : if (!state)
3490 : return -ENOMEM;
3491 :
3492 0 : state->acquire_ctx = ctx;
3493 :
3494 0 : ret = page_flip_common(state, crtc, fb, event, flags);
3495 0 : if (ret != 0)
3496 : goto fail;
3497 :
3498 0 : crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
3499 0 : if (WARN_ON(!crtc_state)) {
3500 : ret = -EINVAL;
3501 : goto fail;
3502 : }
3503 0 : crtc_state->target_vblank = target;
3504 :
3505 0 : ret = drm_atomic_nonblocking_commit(state);
3506 : fail:
3507 0 : drm_atomic_state_put(state);
3508 0 : return ret;
3509 : }
3510 : EXPORT_SYMBOL(drm_atomic_helper_page_flip_target);
3511 :
3512 : /**
3513 : * drm_atomic_helper_bridge_propagate_bus_fmt() - Propagate output format to
3514 : * the input end of a bridge
3515 : * @bridge: bridge control structure
3516 : * @bridge_state: new bridge state
3517 : * @crtc_state: new CRTC state
3518 : * @conn_state: new connector state
3519 : * @output_fmt: tested output bus format
3520 : * @num_input_fmts: will contain the size of the returned array
3521 : *
3522 : * This helper is a pluggable implementation of the
3523 : * &drm_bridge_funcs.atomic_get_input_bus_fmts operation for bridges that don't
3524 : * modify the bus configuration between their input and their output. It
3525 : * returns an array of input formats with a single element set to @output_fmt.
3526 : *
3527 : * RETURNS:
3528 : * a valid format array of size @num_input_fmts, or NULL if the allocation
3529 : * failed
3530 : */
3531 : u32 *
3532 0 : drm_atomic_helper_bridge_propagate_bus_fmt(struct drm_bridge *bridge,
3533 : struct drm_bridge_state *bridge_state,
3534 : struct drm_crtc_state *crtc_state,
3535 : struct drm_connector_state *conn_state,
3536 : u32 output_fmt,
3537 : unsigned int *num_input_fmts)
3538 : {
3539 : u32 *input_fmts;
3540 :
3541 0 : input_fmts = kzalloc(sizeof(*input_fmts), GFP_KERNEL);
3542 0 : if (!input_fmts) {
3543 0 : *num_input_fmts = 0;
3544 0 : return NULL;
3545 : }
3546 :
3547 0 : *num_input_fmts = 1;
3548 0 : input_fmts[0] = output_fmt;
3549 0 : return input_fmts;
3550 : }
3551 : EXPORT_SYMBOL(drm_atomic_helper_bridge_propagate_bus_fmt);
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