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1 : : /*
2 : : * Copyright (C) 2018 Intel Corp.
3 : : *
4 : : * Permission is hereby granted, free of charge, to any person obtaining a
5 : : * copy of this software and associated documentation files (the "Software"),
6 : : * to deal in the Software without restriction, including without limitation
7 : : * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 : : * and/or sell copies of the Software, and to permit persons to whom the
9 : : * Software is furnished to do so, subject to the following conditions:
10 : : *
11 : : * The above copyright notice and this permission notice shall be included in
12 : : * all copies or substantial portions of the Software.
13 : : *
14 : : * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 : : * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 : : * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 : : * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 : : * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 : : * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 : : * OTHER DEALINGS IN THE SOFTWARE.
21 : : *
22 : : * Authors:
23 : : * Rob Clark <robdclark@gmail.com>
24 : : * Daniel Vetter <daniel.vetter@ffwll.ch>
25 : : */
26 : :
27 : : #include <drm/drm_atomic.h>
28 : : #include <drm/drm_atomic_state_helper.h>
29 : : #include <drm/drm_connector.h>
30 : : #include <drm/drm_crtc.h>
31 : : #include <drm/drm_device.h>
32 : : #include <drm/drm_plane.h>
33 : : #include <drm/drm_print.h>
34 : : #include <drm/drm_writeback.h>
35 : :
36 : : #include <linux/slab.h>
37 : : #include <linux/dma-fence.h>
38 : :
39 : : /**
40 : : * DOC: atomic state reset and initialization
41 : : *
42 : : * Both the drm core and the atomic helpers assume that there is always the full
43 : : * and correct atomic software state for all connectors, CRTCs and planes
44 : : * available. Which is a bit a problem on driver load and also after system
45 : : * suspend. One way to solve this is to have a hardware state read-out
46 : : * infrastructure which reconstructs the full software state (e.g. the i915
47 : : * driver).
48 : : *
49 : : * The simpler solution is to just reset the software state to everything off,
50 : : * which is easiest to do by calling drm_mode_config_reset(). To facilitate this
51 : : * the atomic helpers provide default reset implementations for all hooks.
52 : : *
53 : : * On the upside the precise state tracking of atomic simplifies system suspend
54 : : * and resume a lot. For drivers using drm_mode_config_reset() a complete recipe
55 : : * is implemented in drm_atomic_helper_suspend() and drm_atomic_helper_resume().
56 : : * For other drivers the building blocks are split out, see the documentation
57 : : * for these functions.
58 : : */
59 : :
60 : : /**
61 : : * __drm_atomic_helper_crtc_state_reset - reset the CRTC state
62 : : * @crtc_state: atomic CRTC state, must not be NULL
63 : : * @crtc: CRTC object, must not be NULL
64 : : *
65 : : * Initializes the newly allocated @crtc_state with default
66 : : * values. This is useful for drivers that subclass the CRTC state.
67 : : */
68 : : void
69 : 0 : __drm_atomic_helper_crtc_state_reset(struct drm_crtc_state *crtc_state,
70 : : struct drm_crtc *crtc)
71 : : {
72 : 0 : crtc_state->crtc = crtc;
73 : 0 : }
74 : : EXPORT_SYMBOL(__drm_atomic_helper_crtc_state_reset);
75 : :
76 : : /**
77 : : * __drm_atomic_helper_crtc_reset - reset state on CRTC
78 : : * @crtc: drm CRTC
79 : : * @crtc_state: CRTC state to assign
80 : : *
81 : : * Initializes the newly allocated @crtc_state and assigns it to
82 : : * the &drm_crtc->state pointer of @crtc, usually required when
83 : : * initializing the drivers or when called from the &drm_crtc_funcs.reset
84 : : * hook.
85 : : *
86 : : * This is useful for drivers that subclass the CRTC state.
87 : : */
88 : : void
89 : 0 : __drm_atomic_helper_crtc_reset(struct drm_crtc *crtc,
90 : : struct drm_crtc_state *crtc_state)
91 : : {
92 [ # # ]: 0 : if (crtc_state)
93 : 0 : __drm_atomic_helper_crtc_state_reset(crtc_state, crtc);
94 : :
95 : 0 : crtc->state = crtc_state;
96 : 0 : }
97 : : EXPORT_SYMBOL(__drm_atomic_helper_crtc_reset);
98 : :
99 : : /**
100 : : * drm_atomic_helper_crtc_reset - default &drm_crtc_funcs.reset hook for CRTCs
101 : : * @crtc: drm CRTC
102 : : *
103 : : * Resets the atomic state for @crtc by freeing the state pointer (which might
104 : : * be NULL, e.g. at driver load time) and allocating a new empty state object.
105 : : */
106 : 0 : void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc)
107 : : {
108 : 0 : struct drm_crtc_state *crtc_state =
109 : 0 : kzalloc(sizeof(*crtc->state), GFP_KERNEL);
110 : :
111 [ # # ]: 0 : if (crtc->state)
112 : 0 : crtc->funcs->atomic_destroy_state(crtc, crtc->state);
113 : :
114 [ # # ]: 0 : __drm_atomic_helper_crtc_reset(crtc, crtc_state);
115 : 0 : }
116 : : EXPORT_SYMBOL(drm_atomic_helper_crtc_reset);
117 : :
118 : : /**
119 : : * __drm_atomic_helper_crtc_duplicate_state - copy atomic CRTC state
120 : : * @crtc: CRTC object
121 : : * @state: atomic CRTC state
122 : : *
123 : : * Copies atomic state from a CRTC's current state and resets inferred values.
124 : : * This is useful for drivers that subclass the CRTC state.
125 : : */
126 : 0 : void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
127 : : struct drm_crtc_state *state)
128 : : {
129 : 0 : memcpy(state, crtc->state, sizeof(*state));
130 : :
131 [ # # ]: 0 : if (state->mode_blob)
132 : 0 : drm_property_blob_get(state->mode_blob);
133 [ # # ]: 0 : if (state->degamma_lut)
134 : 0 : drm_property_blob_get(state->degamma_lut);
135 [ # # ]: 0 : if (state->ctm)
136 : 0 : drm_property_blob_get(state->ctm);
137 [ # # ]: 0 : if (state->gamma_lut)
138 : 0 : drm_property_blob_get(state->gamma_lut);
139 : 0 : state->mode_changed = false;
140 : 0 : state->active_changed = false;
141 : 0 : state->planes_changed = false;
142 : 0 : state->connectors_changed = false;
143 : 0 : state->color_mgmt_changed = false;
144 : 0 : state->zpos_changed = false;
145 : 0 : state->commit = NULL;
146 : 0 : state->event = NULL;
147 : 0 : state->async_flip = false;
148 : :
149 : : /* Self refresh should be canceled when a new update is available */
150 [ # # ]: 0 : state->active = drm_atomic_crtc_effectively_active(state);
151 : 0 : state->self_refresh_active = false;
152 : 0 : }
153 : : EXPORT_SYMBOL(__drm_atomic_helper_crtc_duplicate_state);
154 : :
155 : : /**
156 : : * drm_atomic_helper_crtc_duplicate_state - default state duplicate hook
157 : : * @crtc: drm CRTC
158 : : *
159 : : * Default CRTC state duplicate hook for drivers which don't have their own
160 : : * subclassed CRTC state structure.
161 : : */
162 : : struct drm_crtc_state *
163 : 0 : drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc)
164 : : {
165 : 0 : struct drm_crtc_state *state;
166 : :
167 [ # # # # ]: 0 : if (WARN_ON(!crtc->state))
168 : : return NULL;
169 : :
170 : 0 : state = kmalloc(sizeof(*state), GFP_KERNEL);
171 [ # # ]: 0 : if (state)
172 : 0 : __drm_atomic_helper_crtc_duplicate_state(crtc, state);
173 : :
174 : : return state;
175 : : }
176 : : EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state);
177 : :
178 : : /**
179 : : * __drm_atomic_helper_crtc_destroy_state - release CRTC state
180 : : * @state: CRTC state object to release
181 : : *
182 : : * Releases all resources stored in the CRTC state without actually freeing
183 : : * the memory of the CRTC state. This is useful for drivers that subclass the
184 : : * CRTC state.
185 : : */
186 : 0 : void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc_state *state)
187 : : {
188 [ # # ]: 0 : if (state->commit) {
189 : : /*
190 : : * In the event that a non-blocking commit returns
191 : : * -ERESTARTSYS before the commit_tail work is queued, we will
192 : : * have an extra reference to the commit object. Release it, if
193 : : * the event has not been consumed by the worker.
194 : : *
195 : : * state->event may be freed, so we can't directly look at
196 : : * state->event->base.completion.
197 : : */
198 [ # # # # ]: 0 : if (state->event && state->commit->abort_completion)
199 : 0 : drm_crtc_commit_put(state->commit);
200 : :
201 : 0 : kfree(state->commit->event);
202 : 0 : state->commit->event = NULL;
203 : :
204 : 0 : drm_crtc_commit_put(state->commit);
205 : : }
206 : :
207 : 0 : drm_property_blob_put(state->mode_blob);
208 : 0 : drm_property_blob_put(state->degamma_lut);
209 : 0 : drm_property_blob_put(state->ctm);
210 : 0 : drm_property_blob_put(state->gamma_lut);
211 : 0 : }
212 : : EXPORT_SYMBOL(__drm_atomic_helper_crtc_destroy_state);
213 : :
214 : : /**
215 : : * drm_atomic_helper_crtc_destroy_state - default state destroy hook
216 : : * @crtc: drm CRTC
217 : : * @state: CRTC state object to release
218 : : *
219 : : * Default CRTC state destroy hook for drivers which don't have their own
220 : : * subclassed CRTC state structure.
221 : : */
222 : 0 : void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
223 : : struct drm_crtc_state *state)
224 : : {
225 : 0 : __drm_atomic_helper_crtc_destroy_state(state);
226 : 0 : kfree(state);
227 : 0 : }
228 : : EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
229 : :
230 : : /**
231 : : * __drm_atomic_helper_plane_state_reset - resets plane state to default values
232 : : * @plane_state: atomic plane state, must not be NULL
233 : : * @plane: plane object, must not be NULL
234 : : *
235 : : * Initializes the newly allocated @plane_state with default
236 : : * values. This is useful for drivers that subclass the CRTC state.
237 : : */
238 : 0 : void __drm_atomic_helper_plane_state_reset(struct drm_plane_state *plane_state,
239 : : struct drm_plane *plane)
240 : : {
241 : 0 : plane_state->plane = plane;
242 : 0 : plane_state->rotation = DRM_MODE_ROTATE_0;
243 : :
244 : 0 : plane_state->alpha = DRM_BLEND_ALPHA_OPAQUE;
245 : 0 : plane_state->pixel_blend_mode = DRM_MODE_BLEND_PREMULTI;
246 : 0 : }
247 : : EXPORT_SYMBOL(__drm_atomic_helper_plane_state_reset);
248 : :
249 : : /**
250 : : * __drm_atomic_helper_plane_reset - reset state on plane
251 : : * @plane: drm plane
252 : : * @plane_state: plane state to assign
253 : : *
254 : : * Initializes the newly allocated @plane_state and assigns it to
255 : : * the &drm_crtc->state pointer of @plane, usually required when
256 : : * initializing the drivers or when called from the &drm_plane_funcs.reset
257 : : * hook.
258 : : *
259 : : * This is useful for drivers that subclass the plane state.
260 : : */
261 : 0 : void __drm_atomic_helper_plane_reset(struct drm_plane *plane,
262 : : struct drm_plane_state *plane_state)
263 : : {
264 [ # # ]: 0 : if (plane_state)
265 : 0 : __drm_atomic_helper_plane_state_reset(plane_state, plane);
266 : :
267 : 0 : plane->state = plane_state;
268 : 0 : }
269 : : EXPORT_SYMBOL(__drm_atomic_helper_plane_reset);
270 : :
271 : : /**
272 : : * drm_atomic_helper_plane_reset - default &drm_plane_funcs.reset hook for planes
273 : : * @plane: drm plane
274 : : *
275 : : * Resets the atomic state for @plane by freeing the state pointer (which might
276 : : * be NULL, e.g. at driver load time) and allocating a new empty state object.
277 : : */
278 : 0 : void drm_atomic_helper_plane_reset(struct drm_plane *plane)
279 : : {
280 [ # # ]: 0 : if (plane->state)
281 : 0 : __drm_atomic_helper_plane_destroy_state(plane->state);
282 : :
283 : 0 : kfree(plane->state);
284 : 0 : plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
285 [ # # ]: 0 : if (plane->state)
286 : 0 : __drm_atomic_helper_plane_reset(plane, plane->state);
287 : 0 : }
288 : : EXPORT_SYMBOL(drm_atomic_helper_plane_reset);
289 : :
290 : : /**
291 : : * __drm_atomic_helper_plane_duplicate_state - copy atomic plane state
292 : : * @plane: plane object
293 : : * @state: atomic plane state
294 : : *
295 : : * Copies atomic state from a plane's current state. This is useful for
296 : : * drivers that subclass the plane state.
297 : : */
298 : 0 : void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
299 : : struct drm_plane_state *state)
300 : : {
301 : 0 : memcpy(state, plane->state, sizeof(*state));
302 : :
303 [ # # ]: 0 : if (state->fb)
304 : 0 : drm_framebuffer_get(state->fb);
305 : :
306 : 0 : state->fence = NULL;
307 : 0 : state->commit = NULL;
308 : 0 : state->fb_damage_clips = NULL;
309 : 0 : }
310 : : EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);
311 : :
312 : : /**
313 : : * drm_atomic_helper_plane_duplicate_state - default state duplicate hook
314 : : * @plane: drm plane
315 : : *
316 : : * Default plane state duplicate hook for drivers which don't have their own
317 : : * subclassed plane state structure.
318 : : */
319 : : struct drm_plane_state *
320 : 0 : drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane)
321 : : {
322 : 0 : struct drm_plane_state *state;
323 : :
324 [ # # # # ]: 0 : if (WARN_ON(!plane->state))
325 : : return NULL;
326 : :
327 : 0 : state = kmalloc(sizeof(*state), GFP_KERNEL);
328 [ # # ]: 0 : if (state)
329 : 0 : __drm_atomic_helper_plane_duplicate_state(plane, state);
330 : :
331 : : return state;
332 : : }
333 : : EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state);
334 : :
335 : : /**
336 : : * __drm_atomic_helper_plane_destroy_state - release plane state
337 : : * @state: plane state object to release
338 : : *
339 : : * Releases all resources stored in the plane state without actually freeing
340 : : * the memory of the plane state. This is useful for drivers that subclass the
341 : : * plane state.
342 : : */
343 : 0 : void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
344 : : {
345 [ # # ]: 0 : if (state->fb)
346 : 0 : drm_framebuffer_put(state->fb);
347 : :
348 [ # # ]: 0 : if (state->fence)
349 : 0 : dma_fence_put(state->fence);
350 : :
351 [ # # ]: 0 : if (state->commit)
352 : 0 : drm_crtc_commit_put(state->commit);
353 : :
354 : 0 : drm_property_blob_put(state->fb_damage_clips);
355 : 0 : }
356 : : EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
357 : :
358 : : /**
359 : : * drm_atomic_helper_plane_destroy_state - default state destroy hook
360 : : * @plane: drm plane
361 : : * @state: plane state object to release
362 : : *
363 : : * Default plane state destroy hook for drivers which don't have their own
364 : : * subclassed plane state structure.
365 : : */
366 : 0 : void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
367 : : struct drm_plane_state *state)
368 : : {
369 : 0 : __drm_atomic_helper_plane_destroy_state(state);
370 : 0 : kfree(state);
371 : 0 : }
372 : : EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
373 : :
374 : : /**
375 : : * __drm_atomic_helper_connector_state_reset - reset the connector state
376 : : * @conn_state: atomic connector state, must not be NULL
377 : : * @connector: connectotr object, must not be NULL
378 : : *
379 : : * Initializes the newly allocated @conn_state with default
380 : : * values. This is useful for drivers that subclass the connector state.
381 : : */
382 : : void
383 : 0 : __drm_atomic_helper_connector_state_reset(struct drm_connector_state *conn_state,
384 : : struct drm_connector *connector)
385 : : {
386 : 0 : conn_state->connector = connector;
387 : 0 : }
388 : : EXPORT_SYMBOL(__drm_atomic_helper_connector_state_reset);
389 : :
390 : : /**
391 : : * __drm_atomic_helper_connector_reset - reset state on connector
392 : : * @connector: drm connector
393 : : * @conn_state: connector state to assign
394 : : *
395 : : * Initializes the newly allocated @conn_state and assigns it to
396 : : * the &drm_connector->state pointer of @connector, usually required when
397 : : * initializing the drivers or when called from the &drm_connector_funcs.reset
398 : : * hook.
399 : : *
400 : : * This is useful for drivers that subclass the connector state.
401 : : */
402 : : void
403 : 0 : __drm_atomic_helper_connector_reset(struct drm_connector *connector,
404 : : struct drm_connector_state *conn_state)
405 : : {
406 [ # # ]: 0 : if (conn_state)
407 : 0 : __drm_atomic_helper_connector_state_reset(conn_state, connector);
408 : :
409 : 0 : connector->state = conn_state;
410 : 0 : }
411 : : EXPORT_SYMBOL(__drm_atomic_helper_connector_reset);
412 : :
413 : : /**
414 : : * drm_atomic_helper_connector_reset - default &drm_connector_funcs.reset hook for connectors
415 : : * @connector: drm connector
416 : : *
417 : : * Resets the atomic state for @connector by freeing the state pointer (which
418 : : * might be NULL, e.g. at driver load time) and allocating a new empty state
419 : : * object.
420 : : */
421 : 0 : void drm_atomic_helper_connector_reset(struct drm_connector *connector)
422 : : {
423 : 0 : struct drm_connector_state *conn_state =
424 : : kzalloc(sizeof(*conn_state), GFP_KERNEL);
425 : :
426 [ # # ]: 0 : if (connector->state)
427 : 0 : __drm_atomic_helper_connector_destroy_state(connector->state);
428 : :
429 : 0 : kfree(connector->state);
430 [ # # ]: 0 : __drm_atomic_helper_connector_reset(connector, conn_state);
431 : 0 : }
432 : : EXPORT_SYMBOL(drm_atomic_helper_connector_reset);
433 : :
434 : : /**
435 : : * drm_atomic_helper_connector_tv_reset - Resets TV connector properties
436 : : * @connector: DRM connector
437 : : *
438 : : * Resets the TV-related properties attached to a connector.
439 : : */
440 : 0 : void drm_atomic_helper_connector_tv_reset(struct drm_connector *connector)
441 : : {
442 : 0 : struct drm_cmdline_mode *cmdline = &connector->cmdline_mode;
443 : 0 : struct drm_connector_state *state = connector->state;
444 : :
445 : 0 : state->tv.margins.left = cmdline->tv_margins.left;
446 : 0 : state->tv.margins.right = cmdline->tv_margins.right;
447 : 0 : state->tv.margins.top = cmdline->tv_margins.top;
448 : 0 : state->tv.margins.bottom = cmdline->tv_margins.bottom;
449 : 0 : }
450 : : EXPORT_SYMBOL(drm_atomic_helper_connector_tv_reset);
451 : :
452 : : /**
453 : : * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state
454 : : * @connector: connector object
455 : : * @state: atomic connector state
456 : : *
457 : : * Copies atomic state from a connector's current state. This is useful for
458 : : * drivers that subclass the connector state.
459 : : */
460 : : void
461 : 0 : __drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
462 : : struct drm_connector_state *state)
463 : : {
464 : 0 : memcpy(state, connector->state, sizeof(*state));
465 [ # # ]: 0 : if (state->crtc)
466 : 0 : drm_connector_get(connector);
467 : 0 : state->commit = NULL;
468 : :
469 [ # # ]: 0 : if (state->hdr_output_metadata)
470 : 0 : drm_property_blob_get(state->hdr_output_metadata);
471 : :
472 : : /* Don't copy over a writeback job, they are used only once */
473 : 0 : state->writeback_job = NULL;
474 : 0 : }
475 : : EXPORT_SYMBOL(__drm_atomic_helper_connector_duplicate_state);
476 : :
477 : : /**
478 : : * drm_atomic_helper_connector_duplicate_state - default state duplicate hook
479 : : * @connector: drm connector
480 : : *
481 : : * Default connector state duplicate hook for drivers which don't have their own
482 : : * subclassed connector state structure.
483 : : */
484 : : struct drm_connector_state *
485 : 0 : drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector)
486 : : {
487 : 0 : struct drm_connector_state *state;
488 : :
489 [ # # # # ]: 0 : if (WARN_ON(!connector->state))
490 : : return NULL;
491 : :
492 : 0 : state = kmalloc(sizeof(*state), GFP_KERNEL);
493 [ # # ]: 0 : if (state)
494 : 0 : __drm_atomic_helper_connector_duplicate_state(connector, state);
495 : :
496 : : return state;
497 : : }
498 : : EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
499 : :
500 : : /**
501 : : * __drm_atomic_helper_connector_destroy_state - release connector state
502 : : * @state: connector state object to release
503 : : *
504 : : * Releases all resources stored in the connector state without actually
505 : : * freeing the memory of the connector state. This is useful for drivers that
506 : : * subclass the connector state.
507 : : */
508 : : void
509 : 0 : __drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state)
510 : : {
511 [ # # ]: 0 : if (state->crtc)
512 : 0 : drm_connector_put(state->connector);
513 : :
514 [ # # ]: 0 : if (state->commit)
515 : 0 : drm_crtc_commit_put(state->commit);
516 : :
517 [ # # ]: 0 : if (state->writeback_job)
518 : 0 : drm_writeback_cleanup_job(state->writeback_job);
519 : :
520 : 0 : drm_property_blob_put(state->hdr_output_metadata);
521 : 0 : }
522 : : EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state);
523 : :
524 : : /**
525 : : * drm_atomic_helper_connector_destroy_state - default state destroy hook
526 : : * @connector: drm connector
527 : : * @state: connector state object to release
528 : : *
529 : : * Default connector state destroy hook for drivers which don't have their own
530 : : * subclassed connector state structure.
531 : : */
532 : 0 : void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
533 : : struct drm_connector_state *state)
534 : : {
535 : 0 : __drm_atomic_helper_connector_destroy_state(state);
536 : 0 : kfree(state);
537 : 0 : }
538 : : EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);
539 : :
540 : : /**
541 : : * __drm_atomic_helper_private_duplicate_state - copy atomic private state
542 : : * @obj: CRTC object
543 : : * @state: new private object state
544 : : *
545 : : * Copies atomic state from a private objects's current state and resets inferred values.
546 : : * This is useful for drivers that subclass the private state.
547 : : */
548 : 0 : void __drm_atomic_helper_private_obj_duplicate_state(struct drm_private_obj *obj,
549 : : struct drm_private_state *state)
550 : : {
551 : 0 : memcpy(state, obj->state, sizeof(*state));
552 : 0 : }
553 : : EXPORT_SYMBOL(__drm_atomic_helper_private_obj_duplicate_state);
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