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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_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);
1/*
2 * Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
3 * Copyright (C) 2017 Broadcom
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of
8 * the License, or (at your option) any later version.
9 */
10
11#include <drm/drmP.h>
12#include <drm/drm_panel.h>
13#include <drm/drm_atomic_helper.h>
14#include <drm/drm_connector.h>
15#include <drm/drm_crtc_helper.h>
16#include <drm/drm_encoder.h>
17#include <drm/drm_modeset_helper_vtables.h>
18#include <drm/drm_panel.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);
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{
62 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
63 struct drm_connector *connector = &panel_bridge->connector;
64 int ret;
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_mode_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 const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
128 .attach = panel_bridge_attach,
129 .detach = panel_bridge_detach,
130 .pre_enable = panel_bridge_pre_enable,
131 .enable = panel_bridge_enable,
132 .disable = panel_bridge_disable,
133 .post_disable = panel_bridge_post_disable,
134};
135
136/**
137 * drm_panel_bridge_add - Creates a drm_bridge and drm_connector that
138 * just calls the appropriate functions from drm_panel.
139 *
140 * @panel: The drm_panel being wrapped. Must be non-NULL.
141 * @connector_type: The DRM_MODE_CONNECTOR_* for the connector to be
142 * created.
143 *
144 * For drivers converting from directly using drm_panel: The expected
145 * usage pattern is that during either encoder module probe or DSI
146 * host attach, a drm_panel will be looked up through
147 * drm_of_find_panel_or_bridge(). drm_panel_bridge_add() is used to
148 * wrap that panel in the new bridge, and the result can then be
149 * passed to drm_bridge_attach(). The drm_panel_prepare() and related
150 * functions can be dropped from the encoder driver (they're now
151 * called by the KMS helpers before calling into the encoder), along
152 * with connector creation. When done with the bridge,
153 * drm_bridge_detach() should be called as normal, then
154 * drm_panel_bridge_remove() to free it.
155 */
156struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel,
157 u32 connector_type)
158{
159 struct panel_bridge *panel_bridge;
160
161 if (!panel)
162 return ERR_PTR(-EINVAL);
163
164 panel_bridge = devm_kzalloc(panel->dev, sizeof(*panel_bridge),
165 GFP_KERNEL);
166 if (!panel_bridge)
167 return ERR_PTR(-ENOMEM);
168
169 panel_bridge->connector_type = connector_type;
170 panel_bridge->panel = panel;
171
172 panel_bridge->bridge.funcs = &panel_bridge_bridge_funcs;
173#ifdef CONFIG_OF
174 panel_bridge->bridge.of_node = panel->dev->of_node;
175#endif
176
177 drm_bridge_add(&panel_bridge->bridge);
178
179 return &panel_bridge->bridge;
180}
181EXPORT_SYMBOL(drm_panel_bridge_add);
182
183/**
184 * drm_panel_bridge_remove - Unregisters and frees a drm_bridge
185 * created by drm_panel_bridge_add().
186 *
187 * @bridge: The drm_bridge being freed.
188 */
189void drm_panel_bridge_remove(struct drm_bridge *bridge)
190{
191 struct panel_bridge *panel_bridge;
192
193 if (!bridge)
194 return;
195
196 if (bridge->funcs != &panel_bridge_bridge_funcs)
197 return;
198
199 panel_bridge = drm_bridge_to_panel_bridge(bridge);
200
201 drm_bridge_remove(bridge);
202 devm_kfree(panel_bridge->panel->dev, bridge);
203}
204EXPORT_SYMBOL(drm_panel_bridge_remove);
205
206static void devm_drm_panel_bridge_release(struct device *dev, void *res)
207{
208 struct drm_bridge **bridge = res;
209
210 drm_panel_bridge_remove(*bridge);
211}
212
213struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev,
214 struct drm_panel *panel,
215 u32 connector_type)
216{
217 struct drm_bridge **ptr, *bridge;
218
219 ptr = devres_alloc(devm_drm_panel_bridge_release, sizeof(*ptr),
220 GFP_KERNEL);
221 if (!ptr)
222 return ERR_PTR(-ENOMEM);
223
224 bridge = drm_panel_bridge_add(panel, connector_type);
225 if (!IS_ERR(bridge)) {
226 *ptr = bridge;
227 devres_add(dev, ptr);
228 } else {
229 devres_free(ptr);
230 }
231
232 return bridge;
233}
234EXPORT_SYMBOL(devm_drm_panel_bridge_add);