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