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