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