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