1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com> |
4 | * Copyright (C) 2017 Broadcom |
5 | */ |
6 | |
7 | #include <linux/device.h> |
8 | |
9 | #include <drm/drm_atomic_helper.h> |
10 | #include <drm/drm_bridge.h> |
11 | #include <drm/drm_connector.h> |
12 | #include <drm/drm_encoder.h> |
13 | #include <drm/drm_managed.h> |
14 | #include <drm/drm_modeset_helper_vtables.h> |
15 | #include <drm/drm_of.h> |
16 | #include <drm/drm_panel.h> |
17 | #include <drm/drm_print.h> |
18 | #include <drm/drm_probe_helper.h> |
19 | |
20 | struct panel_bridge { |
21 | struct drm_bridge bridge; |
22 | struct drm_connector connector; |
23 | struct drm_panel *panel; |
24 | struct device_link *link; |
25 | u32 connector_type; |
26 | }; |
27 | |
28 | static inline struct panel_bridge * |
29 | drm_bridge_to_panel_bridge(struct drm_bridge *bridge) |
30 | { |
31 | return container_of(bridge, struct panel_bridge, bridge); |
32 | } |
33 | |
34 | static inline struct panel_bridge * |
35 | drm_connector_to_panel_bridge(struct drm_connector *connector) |
36 | { |
37 | return container_of(connector, struct panel_bridge, connector); |
38 | } |
39 | |
40 | static int panel_bridge_connector_get_modes(struct drm_connector *connector) |
41 | { |
42 | struct panel_bridge *panel_bridge = |
43 | drm_connector_to_panel_bridge(connector); |
44 | |
45 | return drm_panel_get_modes(panel: panel_bridge->panel, connector); |
46 | } |
47 | |
48 | static const struct drm_connector_helper_funcs |
49 | panel_bridge_connector_helper_funcs = { |
50 | .get_modes = panel_bridge_connector_get_modes, |
51 | }; |
52 | |
53 | static const struct drm_connector_funcs panel_bridge_connector_funcs = { |
54 | .reset = drm_atomic_helper_connector_reset, |
55 | .fill_modes = drm_helper_probe_single_connector_modes, |
56 | .destroy = drm_connector_cleanup, |
57 | .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, |
58 | .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, |
59 | }; |
60 | |
61 | static int panel_bridge_attach(struct drm_bridge *bridge, |
62 | enum drm_bridge_attach_flags flags) |
63 | { |
64 | struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); |
65 | struct drm_connector *connector = &panel_bridge->connector; |
66 | struct drm_panel *panel = panel_bridge->panel; |
67 | struct drm_device *drm_dev = bridge->dev; |
68 | int ret; |
69 | |
70 | panel_bridge->link = device_link_add(consumer: drm_dev->dev, supplier: panel->dev, |
71 | DL_FLAG_STATELESS); |
72 | if (!panel_bridge->link) { |
73 | DRM_ERROR("Failed to add device link between %s and %s\n" , |
74 | dev_name(drm_dev->dev), dev_name(panel->dev)); |
75 | return -EINVAL; |
76 | } |
77 | |
78 | if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) |
79 | return 0; |
80 | |
81 | if (!bridge->encoder) { |
82 | DRM_ERROR("Missing encoder\n" ); |
83 | device_link_del(link: panel_bridge->link); |
84 | return -ENODEV; |
85 | } |
86 | |
87 | drm_connector_helper_add(connector, |
88 | funcs: &panel_bridge_connector_helper_funcs); |
89 | |
90 | ret = drm_connector_init(dev: bridge->dev, connector, |
91 | funcs: &panel_bridge_connector_funcs, |
92 | connector_type: panel_bridge->connector_type); |
93 | if (ret) { |
94 | DRM_ERROR("Failed to initialize connector\n" ); |
95 | device_link_del(link: panel_bridge->link); |
96 | return ret; |
97 | } |
98 | |
99 | drm_panel_bridge_set_orientation(connector, bridge); |
100 | |
101 | drm_connector_attach_encoder(connector: &panel_bridge->connector, |
102 | encoder: bridge->encoder); |
103 | |
104 | if (bridge->dev->registered) { |
105 | if (connector->funcs->reset) |
106 | connector->funcs->reset(connector); |
107 | drm_connector_register(connector); |
108 | } |
109 | |
110 | return 0; |
111 | } |
112 | |
113 | static void panel_bridge_detach(struct drm_bridge *bridge) |
114 | { |
115 | struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); |
116 | struct drm_connector *connector = &panel_bridge->connector; |
117 | |
118 | device_link_del(link: panel_bridge->link); |
119 | |
120 | /* |
121 | * Cleanup the connector if we know it was initialized. |
122 | * |
123 | * FIXME: This wouldn't be needed if the panel_bridge structure was |
124 | * allocated with drmm_kzalloc(). This might be tricky since the |
125 | * drm_device pointer can only be retrieved when the bridge is attached. |
126 | */ |
127 | if (connector->dev) |
128 | drm_connector_cleanup(connector); |
129 | } |
130 | |
131 | static void panel_bridge_atomic_pre_enable(struct drm_bridge *bridge, |
132 | struct drm_bridge_state *old_bridge_state) |
133 | { |
134 | struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); |
135 | struct drm_atomic_state *atomic_state = old_bridge_state->base.state; |
136 | struct drm_encoder *encoder = bridge->encoder; |
137 | struct drm_crtc *crtc; |
138 | struct drm_crtc_state *old_crtc_state; |
139 | |
140 | crtc = drm_atomic_get_new_crtc_for_encoder(state: atomic_state, encoder); |
141 | if (!crtc) |
142 | return; |
143 | |
144 | old_crtc_state = drm_atomic_get_old_crtc_state(state: atomic_state, crtc); |
145 | if (old_crtc_state && old_crtc_state->self_refresh_active) |
146 | return; |
147 | |
148 | drm_panel_prepare(panel: panel_bridge->panel); |
149 | } |
150 | |
151 | static void panel_bridge_atomic_enable(struct drm_bridge *bridge, |
152 | struct drm_bridge_state *old_bridge_state) |
153 | { |
154 | struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); |
155 | struct drm_atomic_state *atomic_state = old_bridge_state->base.state; |
156 | struct drm_encoder *encoder = bridge->encoder; |
157 | struct drm_crtc *crtc; |
158 | struct drm_crtc_state *old_crtc_state; |
159 | |
160 | crtc = drm_atomic_get_new_crtc_for_encoder(state: atomic_state, encoder); |
161 | if (!crtc) |
162 | return; |
163 | |
164 | old_crtc_state = drm_atomic_get_old_crtc_state(state: atomic_state, crtc); |
165 | if (old_crtc_state && old_crtc_state->self_refresh_active) |
166 | return; |
167 | |
168 | drm_panel_enable(panel: panel_bridge->panel); |
169 | } |
170 | |
171 | static void panel_bridge_atomic_disable(struct drm_bridge *bridge, |
172 | struct drm_bridge_state *old_bridge_state) |
173 | { |
174 | struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); |
175 | struct drm_atomic_state *atomic_state = old_bridge_state->base.state; |
176 | struct drm_encoder *encoder = bridge->encoder; |
177 | struct drm_crtc *crtc; |
178 | struct drm_crtc_state *new_crtc_state; |
179 | |
180 | crtc = drm_atomic_get_old_crtc_for_encoder(state: atomic_state, encoder); |
181 | if (!crtc) |
182 | return; |
183 | |
184 | new_crtc_state = drm_atomic_get_new_crtc_state(state: atomic_state, crtc); |
185 | if (new_crtc_state && new_crtc_state->self_refresh_active) |
186 | return; |
187 | |
188 | drm_panel_disable(panel: panel_bridge->panel); |
189 | } |
190 | |
191 | static void panel_bridge_atomic_post_disable(struct drm_bridge *bridge, |
192 | struct drm_bridge_state *old_bridge_state) |
193 | { |
194 | struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); |
195 | struct drm_atomic_state *atomic_state = old_bridge_state->base.state; |
196 | struct drm_encoder *encoder = bridge->encoder; |
197 | struct drm_crtc *crtc; |
198 | struct drm_crtc_state *new_crtc_state; |
199 | |
200 | crtc = drm_atomic_get_old_crtc_for_encoder(state: atomic_state, encoder); |
201 | if (!crtc) |
202 | return; |
203 | |
204 | new_crtc_state = drm_atomic_get_new_crtc_state(state: atomic_state, crtc); |
205 | if (new_crtc_state && new_crtc_state->self_refresh_active) |
206 | return; |
207 | |
208 | drm_panel_unprepare(panel: panel_bridge->panel); |
209 | } |
210 | |
211 | static int panel_bridge_get_modes(struct drm_bridge *bridge, |
212 | struct drm_connector *connector) |
213 | { |
214 | struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); |
215 | |
216 | return drm_panel_get_modes(panel: panel_bridge->panel, connector); |
217 | } |
218 | |
219 | static void panel_bridge_debugfs_init(struct drm_bridge *bridge, |
220 | struct dentry *root) |
221 | { |
222 | struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); |
223 | struct drm_panel *panel = panel_bridge->panel; |
224 | |
225 | root = debugfs_create_dir(name: "panel" , parent: root); |
226 | if (panel->funcs->debugfs_init) |
227 | panel->funcs->debugfs_init(panel, root); |
228 | } |
229 | |
230 | static const struct drm_bridge_funcs panel_bridge_bridge_funcs = { |
231 | .attach = panel_bridge_attach, |
232 | .detach = panel_bridge_detach, |
233 | .atomic_pre_enable = panel_bridge_atomic_pre_enable, |
234 | .atomic_enable = panel_bridge_atomic_enable, |
235 | .atomic_disable = panel_bridge_atomic_disable, |
236 | .atomic_post_disable = panel_bridge_atomic_post_disable, |
237 | .get_modes = panel_bridge_get_modes, |
238 | .atomic_reset = drm_atomic_helper_bridge_reset, |
239 | .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, |
240 | .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, |
241 | .atomic_get_input_bus_fmts = drm_atomic_helper_bridge_propagate_bus_fmt, |
242 | .debugfs_init = panel_bridge_debugfs_init, |
243 | }; |
244 | |
245 | /** |
246 | * drm_bridge_is_panel - Checks if a drm_bridge is a panel_bridge. |
247 | * |
248 | * @bridge: The drm_bridge to be checked. |
249 | * |
250 | * Returns true if the bridge is a panel bridge, or false otherwise. |
251 | */ |
252 | bool drm_bridge_is_panel(const struct drm_bridge *bridge) |
253 | { |
254 | return bridge->funcs == &panel_bridge_bridge_funcs; |
255 | } |
256 | EXPORT_SYMBOL(drm_bridge_is_panel); |
257 | |
258 | /** |
259 | * drm_panel_bridge_add - Creates a &drm_bridge and &drm_connector that |
260 | * just calls the appropriate functions from &drm_panel. |
261 | * |
262 | * @panel: The drm_panel being wrapped. Must be non-NULL. |
263 | * |
264 | * For drivers converting from directly using drm_panel: The expected |
265 | * usage pattern is that during either encoder module probe or DSI |
266 | * host attach, a drm_panel will be looked up through |
267 | * drm_of_find_panel_or_bridge(). drm_panel_bridge_add() is used to |
268 | * wrap that panel in the new bridge, and the result can then be |
269 | * passed to drm_bridge_attach(). The drm_panel_prepare() and related |
270 | * functions can be dropped from the encoder driver (they're now |
271 | * called by the KMS helpers before calling into the encoder), along |
272 | * with connector creation. When done with the bridge (after |
273 | * drm_mode_config_cleanup() if the bridge has already been attached), then |
274 | * drm_panel_bridge_remove() to free it. |
275 | * |
276 | * The connector type is set to @panel->connector_type, which must be set to a |
277 | * known type. Calling this function with a panel whose connector type is |
278 | * DRM_MODE_CONNECTOR_Unknown will return ERR_PTR(-EINVAL). |
279 | * |
280 | * See devm_drm_panel_bridge_add() for an automatically managed version of this |
281 | * function. |
282 | */ |
283 | struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel) |
284 | { |
285 | if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown)) |
286 | return ERR_PTR(error: -EINVAL); |
287 | |
288 | return drm_panel_bridge_add_typed(panel, connector_type: panel->connector_type); |
289 | } |
290 | EXPORT_SYMBOL(drm_panel_bridge_add); |
291 | |
292 | /** |
293 | * drm_panel_bridge_add_typed - Creates a &drm_bridge and &drm_connector with |
294 | * an explicit connector type. |
295 | * @panel: The drm_panel being wrapped. Must be non-NULL. |
296 | * @connector_type: The connector type (DRM_MODE_CONNECTOR_*) |
297 | * |
298 | * This is just like drm_panel_bridge_add(), but forces the connector type to |
299 | * @connector_type instead of infering it from the panel. |
300 | * |
301 | * This function is deprecated and should not be used in new drivers. Use |
302 | * drm_panel_bridge_add() instead, and fix panel drivers as necessary if they |
303 | * don't report a connector type. |
304 | */ |
305 | struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel, |
306 | u32 connector_type) |
307 | { |
308 | struct panel_bridge *panel_bridge; |
309 | |
310 | if (!panel) |
311 | return ERR_PTR(error: -EINVAL); |
312 | |
313 | panel_bridge = devm_kzalloc(dev: panel->dev, size: sizeof(*panel_bridge), |
314 | GFP_KERNEL); |
315 | if (!panel_bridge) |
316 | return ERR_PTR(error: -ENOMEM); |
317 | |
318 | panel_bridge->connector_type = connector_type; |
319 | panel_bridge->panel = panel; |
320 | |
321 | panel_bridge->bridge.funcs = &panel_bridge_bridge_funcs; |
322 | panel_bridge->bridge.of_node = panel->dev->of_node; |
323 | panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES; |
324 | panel_bridge->bridge.type = connector_type; |
325 | |
326 | drm_bridge_add(bridge: &panel_bridge->bridge); |
327 | |
328 | return &panel_bridge->bridge; |
329 | } |
330 | EXPORT_SYMBOL(drm_panel_bridge_add_typed); |
331 | |
332 | /** |
333 | * drm_panel_bridge_remove - Unregisters and frees a drm_bridge |
334 | * created by drm_panel_bridge_add(). |
335 | * |
336 | * @bridge: The drm_bridge being freed. |
337 | */ |
338 | void drm_panel_bridge_remove(struct drm_bridge *bridge) |
339 | { |
340 | struct panel_bridge *panel_bridge; |
341 | |
342 | if (!bridge) |
343 | return; |
344 | |
345 | if (bridge->funcs != &panel_bridge_bridge_funcs) |
346 | return; |
347 | |
348 | panel_bridge = drm_bridge_to_panel_bridge(bridge); |
349 | |
350 | drm_bridge_remove(bridge); |
351 | devm_kfree(dev: panel_bridge->panel->dev, p: bridge); |
352 | } |
353 | EXPORT_SYMBOL(drm_panel_bridge_remove); |
354 | |
355 | /** |
356 | * drm_panel_bridge_set_orientation - Set the connector's panel orientation |
357 | * from the bridge that can be transformed to panel bridge. |
358 | * |
359 | * @connector: The connector to be set panel orientation. |
360 | * @bridge: The drm_bridge to be transformed to panel bridge. |
361 | * |
362 | * Returns 0 on success, negative errno on failure. |
363 | */ |
364 | int drm_panel_bridge_set_orientation(struct drm_connector *connector, |
365 | struct drm_bridge *bridge) |
366 | { |
367 | struct panel_bridge *panel_bridge; |
368 | |
369 | panel_bridge = drm_bridge_to_panel_bridge(bridge); |
370 | |
371 | return drm_connector_set_orientation_from_panel(connector, |
372 | panel: panel_bridge->panel); |
373 | } |
374 | EXPORT_SYMBOL(drm_panel_bridge_set_orientation); |
375 | |
376 | static void devm_drm_panel_bridge_release(struct device *dev, void *res) |
377 | { |
378 | struct drm_bridge **bridge = res; |
379 | |
380 | drm_panel_bridge_remove(*bridge); |
381 | } |
382 | |
383 | /** |
384 | * devm_drm_panel_bridge_add - Creates a managed &drm_bridge and &drm_connector |
385 | * that just calls the appropriate functions from &drm_panel. |
386 | * @dev: device to tie the bridge lifetime to |
387 | * @panel: The drm_panel being wrapped. Must be non-NULL. |
388 | * |
389 | * This is the managed version of drm_panel_bridge_add() which automatically |
390 | * calls drm_panel_bridge_remove() when @dev is unbound. |
391 | */ |
392 | struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev, |
393 | struct drm_panel *panel) |
394 | { |
395 | if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown)) |
396 | return ERR_PTR(error: -EINVAL); |
397 | |
398 | return devm_drm_panel_bridge_add_typed(dev, panel, |
399 | connector_type: panel->connector_type); |
400 | } |
401 | EXPORT_SYMBOL(devm_drm_panel_bridge_add); |
402 | |
403 | /** |
404 | * devm_drm_panel_bridge_add_typed - Creates a managed &drm_bridge and |
405 | * &drm_connector with an explicit connector type. |
406 | * @dev: device to tie the bridge lifetime to |
407 | * @panel: The drm_panel being wrapped. Must be non-NULL. |
408 | * @connector_type: The connector type (DRM_MODE_CONNECTOR_*) |
409 | * |
410 | * This is just like devm_drm_panel_bridge_add(), but forces the connector type |
411 | * to @connector_type instead of infering it from the panel. |
412 | * |
413 | * This function is deprecated and should not be used in new drivers. Use |
414 | * devm_drm_panel_bridge_add() instead, and fix panel drivers as necessary if |
415 | * they don't report a connector type. |
416 | */ |
417 | struct drm_bridge *devm_drm_panel_bridge_add_typed(struct device *dev, |
418 | struct drm_panel *panel, |
419 | u32 connector_type) |
420 | { |
421 | struct drm_bridge **ptr, *bridge; |
422 | |
423 | ptr = devres_alloc(devm_drm_panel_bridge_release, sizeof(*ptr), |
424 | GFP_KERNEL); |
425 | if (!ptr) |
426 | return ERR_PTR(error: -ENOMEM); |
427 | |
428 | bridge = drm_panel_bridge_add_typed(panel, connector_type); |
429 | if (IS_ERR(ptr: bridge)) { |
430 | devres_free(res: ptr); |
431 | return bridge; |
432 | } |
433 | |
434 | bridge->pre_enable_prev_first = panel->prepare_prev_first; |
435 | |
436 | *ptr = bridge; |
437 | devres_add(dev, res: ptr); |
438 | |
439 | return bridge; |
440 | } |
441 | EXPORT_SYMBOL(devm_drm_panel_bridge_add_typed); |
442 | |
443 | static void drmm_drm_panel_bridge_release(struct drm_device *drm, void *ptr) |
444 | { |
445 | struct drm_bridge *bridge = ptr; |
446 | |
447 | drm_panel_bridge_remove(bridge); |
448 | } |
449 | |
450 | /** |
451 | * drmm_panel_bridge_add - Creates a DRM-managed &drm_bridge and |
452 | * &drm_connector that just calls the |
453 | * appropriate functions from &drm_panel. |
454 | * |
455 | * @drm: DRM device to tie the bridge lifetime to |
456 | * @panel: The drm_panel being wrapped. Must be non-NULL. |
457 | * |
458 | * This is the DRM-managed version of drm_panel_bridge_add() which |
459 | * automatically calls drm_panel_bridge_remove() when @dev is cleaned |
460 | * up. |
461 | */ |
462 | struct drm_bridge *drmm_panel_bridge_add(struct drm_device *drm, |
463 | struct drm_panel *panel) |
464 | { |
465 | struct drm_bridge *bridge; |
466 | int ret; |
467 | |
468 | bridge = drm_panel_bridge_add_typed(panel, panel->connector_type); |
469 | if (IS_ERR(ptr: bridge)) |
470 | return bridge; |
471 | |
472 | ret = drmm_add_action_or_reset(drm, drmm_drm_panel_bridge_release, |
473 | bridge); |
474 | if (ret) |
475 | return ERR_PTR(error: ret); |
476 | |
477 | bridge->pre_enable_prev_first = panel->prepare_prev_first; |
478 | |
479 | return bridge; |
480 | } |
481 | EXPORT_SYMBOL(drmm_panel_bridge_add); |
482 | |
483 | /** |
484 | * drm_panel_bridge_connector - return the connector for the panel bridge |
485 | * @bridge: The drm_bridge. |
486 | * |
487 | * drm_panel_bridge creates the connector. |
488 | * This function gives external access to the connector. |
489 | * |
490 | * Returns: Pointer to drm_connector |
491 | */ |
492 | struct drm_connector *drm_panel_bridge_connector(struct drm_bridge *bridge) |
493 | { |
494 | struct panel_bridge *panel_bridge; |
495 | |
496 | panel_bridge = drm_bridge_to_panel_bridge(bridge); |
497 | |
498 | return &panel_bridge->connector; |
499 | } |
500 | EXPORT_SYMBOL(drm_panel_bridge_connector); |
501 | |
502 | #ifdef CONFIG_OF |
503 | /** |
504 | * devm_drm_of_get_bridge - Return next bridge in the chain |
505 | * @dev: device to tie the bridge lifetime to |
506 | * @np: device tree node containing encoder output ports |
507 | * @port: port in the device tree node |
508 | * @endpoint: endpoint in the device tree node |
509 | * |
510 | * Given a DT node's port and endpoint number, finds the connected node |
511 | * and returns the associated bridge if any, or creates and returns a |
512 | * drm panel bridge instance if a panel is connected. |
513 | * |
514 | * Returns a pointer to the bridge if successful, or an error pointer |
515 | * otherwise. |
516 | */ |
517 | struct drm_bridge *devm_drm_of_get_bridge(struct device *dev, |
518 | struct device_node *np, |
519 | u32 port, u32 endpoint) |
520 | { |
521 | struct drm_bridge *bridge; |
522 | struct drm_panel *panel; |
523 | int ret; |
524 | |
525 | ret = drm_of_find_panel_or_bridge(np, port, endpoint, |
526 | panel: &panel, bridge: &bridge); |
527 | if (ret) |
528 | return ERR_PTR(error: ret); |
529 | |
530 | if (panel) |
531 | bridge = devm_drm_panel_bridge_add(dev, panel); |
532 | |
533 | return bridge; |
534 | } |
535 | EXPORT_SYMBOL(devm_drm_of_get_bridge); |
536 | |
537 | /** |
538 | * drmm_of_get_bridge - Return next bridge in the chain |
539 | * @drm: device to tie the bridge lifetime to |
540 | * @np: device tree node containing encoder output ports |
541 | * @port: port in the device tree node |
542 | * @endpoint: endpoint in the device tree node |
543 | * |
544 | * Given a DT node's port and endpoint number, finds the connected node |
545 | * and returns the associated bridge if any, or creates and returns a |
546 | * drm panel bridge instance if a panel is connected. |
547 | * |
548 | * Returns a drmm managed pointer to the bridge if successful, or an error |
549 | * pointer otherwise. |
550 | */ |
551 | struct drm_bridge *drmm_of_get_bridge(struct drm_device *drm, |
552 | struct device_node *np, |
553 | u32 port, u32 endpoint) |
554 | { |
555 | struct drm_bridge *bridge; |
556 | struct drm_panel *panel; |
557 | int ret; |
558 | |
559 | ret = drm_of_find_panel_or_bridge(np, port, endpoint, |
560 | panel: &panel, bridge: &bridge); |
561 | if (ret) |
562 | return ERR_PTR(error: ret); |
563 | |
564 | if (panel) |
565 | bridge = drmm_panel_bridge_add(drm, panel); |
566 | |
567 | return bridge; |
568 | } |
569 | EXPORT_SYMBOL(drmm_of_get_bridge); |
570 | |
571 | #endif |
572 | |