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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_modeset_helper_vtables.h>
12#include <drm/drm_panel.h>
13#include <drm/drm_print.h>
14#include <drm/drm_probe_helper.h>
15
16struct panel_bridge {
17 struct drm_bridge bridge;
18 struct drm_connector connector;
19 struct drm_panel *panel;
20 u32 connector_type;
21};
22
23static inline struct panel_bridge *
24drm_bridge_to_panel_bridge(struct drm_bridge *bridge)
25{
26 return container_of(bridge, struct panel_bridge, bridge);
27}
28
29static inline struct panel_bridge *
30drm_connector_to_panel_bridge(struct drm_connector *connector)
31{
32 return container_of(connector, struct panel_bridge, connector);
33}
34
35static int panel_bridge_connector_get_modes(struct drm_connector *connector)
36{
37 struct panel_bridge *panel_bridge =
38 drm_connector_to_panel_bridge(connector);
39
40 return drm_panel_get_modes(panel_bridge->panel, connector);
41}
42
43static const struct drm_connector_helper_funcs
44panel_bridge_connector_helper_funcs = {
45 .get_modes = panel_bridge_connector_get_modes,
46};
47
48static const struct drm_connector_funcs panel_bridge_connector_funcs = {
49 .reset = drm_atomic_helper_connector_reset,
50 .fill_modes = drm_helper_probe_single_connector_modes,
51 .destroy = drm_connector_cleanup,
52 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
53 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
54};
55
56static int panel_bridge_attach(struct drm_bridge *bridge,
57 enum drm_bridge_attach_flags flags)
58{
59 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
60 struct drm_connector *connector = &panel_bridge->connector;
61 int ret;
62
63 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
64 return 0;
65
66 if (!bridge->encoder) {
67 DRM_ERROR("Missing encoder\n");
68 return -ENODEV;
69 }
70
71 drm_connector_helper_add(connector,
72 &panel_bridge_connector_helper_funcs);
73
74 ret = drm_connector_init(bridge->dev, connector,
75 &panel_bridge_connector_funcs,
76 panel_bridge->connector_type);
77 if (ret) {
78 DRM_ERROR("Failed to initialize connector\n");
79 return ret;
80 }
81
82 drm_connector_attach_encoder(&panel_bridge->connector,
83 bridge->encoder);
84
85 return 0;
86}
87
88static void panel_bridge_detach(struct drm_bridge *bridge)
89{
90 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
91 struct drm_connector *connector = &panel_bridge->connector;
92
93 /*
94 * Cleanup the connector if we know it was initialized.
95 *
96 * FIXME: This wouldn't be needed if the panel_bridge structure was
97 * allocated with drmm_kzalloc(). This might be tricky since the
98 * drm_device pointer can only be retrieved when the bridge is attached.
99 */
100 if (connector->dev)
101 drm_connector_cleanup(connector);
102}
103
104static void panel_bridge_pre_enable(struct drm_bridge *bridge)
105{
106 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
107
108 drm_panel_prepare(panel_bridge->panel);
109}
110
111static void panel_bridge_enable(struct drm_bridge *bridge)
112{
113 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
114
115 drm_panel_enable(panel_bridge->panel);
116}
117
118static void panel_bridge_disable(struct drm_bridge *bridge)
119{
120 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
121
122 drm_panel_disable(panel_bridge->panel);
123}
124
125static void panel_bridge_post_disable(struct drm_bridge *bridge)
126{
127 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
128
129 drm_panel_unprepare(panel_bridge->panel);
130}
131
132static int panel_bridge_get_modes(struct drm_bridge *bridge,
133 struct drm_connector *connector)
134{
135 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
136
137 return drm_panel_get_modes(panel_bridge->panel, connector);
138}
139
140static const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
141 .attach = panel_bridge_attach,
142 .detach = panel_bridge_detach,
143 .pre_enable = panel_bridge_pre_enable,
144 .enable = panel_bridge_enable,
145 .disable = panel_bridge_disable,
146 .post_disable = panel_bridge_post_disable,
147 .get_modes = panel_bridge_get_modes,
148 .atomic_reset = drm_atomic_helper_bridge_reset,
149 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
150 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
151 .atomic_get_input_bus_fmts = drm_atomic_helper_bridge_propagate_bus_fmt,
152};
153
154/**
155 * drm_panel_bridge_add - Creates a &drm_bridge and &drm_connector that
156 * just calls the appropriate functions from &drm_panel.
157 *
158 * @panel: The drm_panel being wrapped. Must be non-NULL.
159 *
160 * For drivers converting from directly using drm_panel: The expected
161 * usage pattern is that during either encoder module probe or DSI
162 * host attach, a drm_panel will be looked up through
163 * drm_of_find_panel_or_bridge(). drm_panel_bridge_add() is used to
164 * wrap that panel in the new bridge, and the result can then be
165 * passed to drm_bridge_attach(). The drm_panel_prepare() and related
166 * functions can be dropped from the encoder driver (they're now
167 * called by the KMS helpers before calling into the encoder), along
168 * with connector creation. When done with the bridge (after
169 * drm_mode_config_cleanup() if the bridge has already been attached), then
170 * drm_panel_bridge_remove() to free it.
171 *
172 * The connector type is set to @panel->connector_type, which must be set to a
173 * known type. Calling this function with a panel whose connector type is
174 * DRM_MODE_CONNECTOR_Unknown will return ERR_PTR(-EINVAL).
175 *
176 * See devm_drm_panel_bridge_add() for an automatically managed version of this
177 * function.
178 */
179struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel)
180{
181 if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown))
182 return ERR_PTR(-EINVAL);
183
184 return drm_panel_bridge_add_typed(panel, panel->connector_type);
185}
186EXPORT_SYMBOL(drm_panel_bridge_add);
187
188/**
189 * drm_panel_bridge_add_typed - Creates a &drm_bridge and &drm_connector with
190 * an explicit connector type.
191 * @panel: The drm_panel being wrapped. Must be non-NULL.
192 * @connector_type: The connector type (DRM_MODE_CONNECTOR_*)
193 *
194 * This is just like drm_panel_bridge_add(), but forces the connector type to
195 * @connector_type instead of infering it from the panel.
196 *
197 * This function is deprecated and should not be used in new drivers. Use
198 * drm_panel_bridge_add() instead, and fix panel drivers as necessary if they
199 * don't report a connector type.
200 */
201struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel,
202 u32 connector_type)
203{
204 struct panel_bridge *panel_bridge;
205
206 if (!panel)
207 return ERR_PTR(-EINVAL);
208
209 panel_bridge = devm_kzalloc(panel->dev, sizeof(*panel_bridge),
210 GFP_KERNEL);
211 if (!panel_bridge)
212 return ERR_PTR(-ENOMEM);
213
214 panel_bridge->connector_type = connector_type;
215 panel_bridge->panel = panel;
216
217 panel_bridge->bridge.funcs = &panel_bridge_bridge_funcs;
218#ifdef CONFIG_OF
219 panel_bridge->bridge.of_node = panel->dev->of_node;
220#endif
221 panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES;
222 panel_bridge->bridge.type = connector_type;
223
224 drm_bridge_add(&panel_bridge->bridge);
225
226 return &panel_bridge->bridge;
227}
228EXPORT_SYMBOL(drm_panel_bridge_add_typed);
229
230/**
231 * drm_panel_bridge_remove - Unregisters and frees a drm_bridge
232 * created by drm_panel_bridge_add().
233 *
234 * @bridge: The drm_bridge being freed.
235 */
236void drm_panel_bridge_remove(struct drm_bridge *bridge)
237{
238 struct panel_bridge *panel_bridge;
239
240 if (!bridge)
241 return;
242
243 if (bridge->funcs != &panel_bridge_bridge_funcs)
244 return;
245
246 panel_bridge = drm_bridge_to_panel_bridge(bridge);
247
248 drm_bridge_remove(bridge);
249 devm_kfree(panel_bridge->panel->dev, bridge);
250}
251EXPORT_SYMBOL(drm_panel_bridge_remove);
252
253static void devm_drm_panel_bridge_release(struct device *dev, void *res)
254{
255 struct drm_bridge **bridge = res;
256
257 drm_panel_bridge_remove(*bridge);
258}
259
260/**
261 * devm_drm_panel_bridge_add - Creates a managed &drm_bridge and &drm_connector
262 * that just calls the appropriate functions from &drm_panel.
263 * @dev: device to tie the bridge lifetime to
264 * @panel: The drm_panel being wrapped. Must be non-NULL.
265 *
266 * This is the managed version of drm_panel_bridge_add() which automatically
267 * calls drm_panel_bridge_remove() when @dev is unbound.
268 */
269struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev,
270 struct drm_panel *panel)
271{
272 if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown))
273 return ERR_PTR(-EINVAL);
274
275 return devm_drm_panel_bridge_add_typed(dev, panel,
276 panel->connector_type);
277}
278EXPORT_SYMBOL(devm_drm_panel_bridge_add);
279
280/**
281 * devm_drm_panel_bridge_add_typed - Creates a managed &drm_bridge and
282 * &drm_connector with an explicit connector type.
283 * @dev: device to tie the bridge lifetime to
284 * @panel: The drm_panel being wrapped. Must be non-NULL.
285 * @connector_type: The connector type (DRM_MODE_CONNECTOR_*)
286 *
287 * This is just like devm_drm_panel_bridge_add(), but forces the connector type
288 * to @connector_type instead of infering it from the panel.
289 *
290 * This function is deprecated and should not be used in new drivers. Use
291 * devm_drm_panel_bridge_add() instead, and fix panel drivers as necessary if
292 * they don't report a connector type.
293 */
294struct drm_bridge *devm_drm_panel_bridge_add_typed(struct device *dev,
295 struct drm_panel *panel,
296 u32 connector_type)
297{
298 struct drm_bridge **ptr, *bridge;
299
300 ptr = devres_alloc(devm_drm_panel_bridge_release, sizeof(*ptr),
301 GFP_KERNEL);
302 if (!ptr)
303 return ERR_PTR(-ENOMEM);
304
305 bridge = drm_panel_bridge_add_typed(panel, connector_type);
306 if (!IS_ERR(bridge)) {
307 *ptr = bridge;
308 devres_add(dev, ptr);
309 } else {
310 devres_free(ptr);
311 }
312
313 return bridge;
314}
315EXPORT_SYMBOL(devm_drm_panel_bridge_add_typed);
316
317/**
318 * drm_panel_bridge_connector - return the connector for the panel bridge
319 * @bridge: The drm_bridge.
320 *
321 * drm_panel_bridge creates the connector.
322 * This function gives external access to the connector.
323 *
324 * Returns: Pointer to drm_connector
325 */
326struct drm_connector *drm_panel_bridge_connector(struct drm_bridge *bridge)
327{
328 struct panel_bridge *panel_bridge;
329
330 panel_bridge = drm_bridge_to_panel_bridge(bridge);
331
332 return &panel_bridge->connector;
333}
334EXPORT_SYMBOL(drm_panel_bridge_connector);