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