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_of.h> 13 #include <drm/drm_panel.h> 14 #include <drm/drm_print.h> 15 #include <drm/drm_probe_helper.h> 16 17 struct panel_bridge { 18 struct drm_bridge bridge; 19 struct drm_connector connector; 20 struct drm_panel *panel; 21 u32 connector_type; 22 }; 23 24 static inline struct panel_bridge * 25 drm_bridge_to_panel_bridge(struct drm_bridge *bridge) 26 { 27 return container_of(bridge, struct panel_bridge, bridge); 28 } 29 30 static inline struct panel_bridge * 31 drm_connector_to_panel_bridge(struct drm_connector *connector) 32 { 33 return container_of(connector, struct panel_bridge, connector); 34 } 35 36 static int panel_bridge_connector_get_modes(struct drm_connector *connector) 37 { 38 struct panel_bridge *panel_bridge = 39 drm_connector_to_panel_bridge(connector); 40 41 return drm_panel_get_modes(panel_bridge->panel, connector); 42 } 43 44 static const struct drm_connector_helper_funcs 45 panel_bridge_connector_helper_funcs = { 46 .get_modes = panel_bridge_connector_get_modes, 47 }; 48 49 static const struct drm_connector_funcs panel_bridge_connector_funcs = { 50 .reset = drm_atomic_helper_connector_reset, 51 .fill_modes = drm_helper_probe_single_connector_modes, 52 .destroy = drm_connector_cleanup, 53 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 54 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 55 }; 56 57 static int panel_bridge_attach(struct drm_bridge *bridge, 58 enum drm_bridge_attach_flags flags) 59 { 60 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 61 struct drm_connector *connector = &panel_bridge->connector; 62 int ret; 63 64 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) 65 return 0; 66 67 if (!bridge->encoder) { 68 DRM_ERROR("Missing encoder\n"); 69 return -ENODEV; 70 } 71 72 drm_connector_helper_add(connector, 73 &panel_bridge_connector_helper_funcs); 74 75 ret = drm_connector_init(bridge->dev, connector, 76 &panel_bridge_connector_funcs, 77 panel_bridge->connector_type); 78 if (ret) { 79 DRM_ERROR("Failed to initialize connector\n"); 80 return ret; 81 } 82 83 drm_connector_attach_encoder(&panel_bridge->connector, 84 bridge->encoder); 85 86 return 0; 87 } 88 89 static void panel_bridge_detach(struct drm_bridge *bridge) 90 { 91 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 92 struct drm_connector *connector = &panel_bridge->connector; 93 94 /* 95 * Cleanup the connector if we know it was initialized. 96 * 97 * FIXME: This wouldn't be needed if the panel_bridge structure was 98 * allocated with drmm_kzalloc(). This might be tricky since the 99 * drm_device pointer can only be retrieved when the bridge is attached. 100 */ 101 if (connector->dev) 102 drm_connector_cleanup(connector); 103 } 104 105 static void panel_bridge_pre_enable(struct drm_bridge *bridge) 106 { 107 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 108 109 drm_panel_prepare(panel_bridge->panel); 110 } 111 112 static void panel_bridge_enable(struct drm_bridge *bridge) 113 { 114 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 115 116 drm_panel_enable(panel_bridge->panel); 117 } 118 119 static void panel_bridge_disable(struct drm_bridge *bridge) 120 { 121 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 122 123 drm_panel_disable(panel_bridge->panel); 124 } 125 126 static void panel_bridge_post_disable(struct drm_bridge *bridge) 127 { 128 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 129 130 drm_panel_unprepare(panel_bridge->panel); 131 } 132 133 static int panel_bridge_get_modes(struct drm_bridge *bridge, 134 struct drm_connector *connector) 135 { 136 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 137 138 return drm_panel_get_modes(panel_bridge->panel, connector); 139 } 140 141 static const struct drm_bridge_funcs panel_bridge_bridge_funcs = { 142 .attach = panel_bridge_attach, 143 .detach = panel_bridge_detach, 144 .pre_enable = panel_bridge_pre_enable, 145 .enable = panel_bridge_enable, 146 .disable = panel_bridge_disable, 147 .post_disable = panel_bridge_post_disable, 148 .get_modes = panel_bridge_get_modes, 149 .atomic_reset = drm_atomic_helper_bridge_reset, 150 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 151 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 152 .atomic_get_input_bus_fmts = drm_atomic_helper_bridge_propagate_bus_fmt, 153 }; 154 155 /** 156 * drm_panel_bridge_add - Creates a &drm_bridge and &drm_connector that 157 * just calls the appropriate functions from &drm_panel. 158 * 159 * @panel: The drm_panel being wrapped. Must be non-NULL. 160 * 161 * For drivers converting from directly using drm_panel: The expected 162 * usage pattern is that during either encoder module probe or DSI 163 * host attach, a drm_panel will be looked up through 164 * drm_of_find_panel_or_bridge(). drm_panel_bridge_add() is used to 165 * wrap that panel in the new bridge, and the result can then be 166 * passed to drm_bridge_attach(). The drm_panel_prepare() and related 167 * functions can be dropped from the encoder driver (they're now 168 * called by the KMS helpers before calling into the encoder), along 169 * with connector creation. When done with the bridge (after 170 * drm_mode_config_cleanup() if the bridge has already been attached), then 171 * drm_panel_bridge_remove() to free it. 172 * 173 * The connector type is set to @panel->connector_type, which must be set to a 174 * known type. Calling this function with a panel whose connector type is 175 * DRM_MODE_CONNECTOR_Unknown will return ERR_PTR(-EINVAL). 176 * 177 * See devm_drm_panel_bridge_add() for an automatically managed version of this 178 * function. 179 */ 180 struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel) 181 { 182 if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown)) 183 return ERR_PTR(-EINVAL); 184 185 return drm_panel_bridge_add_typed(panel, panel->connector_type); 186 } 187 EXPORT_SYMBOL(drm_panel_bridge_add); 188 189 /** 190 * drm_panel_bridge_add_typed - Creates a &drm_bridge and &drm_connector with 191 * an explicit connector type. 192 * @panel: The drm_panel being wrapped. Must be non-NULL. 193 * @connector_type: The connector type (DRM_MODE_CONNECTOR_*) 194 * 195 * This is just like drm_panel_bridge_add(), but forces the connector type to 196 * @connector_type instead of infering it from the panel. 197 * 198 * This function is deprecated and should not be used in new drivers. Use 199 * drm_panel_bridge_add() instead, and fix panel drivers as necessary if they 200 * don't report a connector type. 201 */ 202 struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel, 203 u32 connector_type) 204 { 205 struct panel_bridge *panel_bridge; 206 207 if (!panel) 208 return ERR_PTR(-EINVAL); 209 210 panel_bridge = devm_kzalloc(panel->dev, sizeof(*panel_bridge), 211 GFP_KERNEL); 212 if (!panel_bridge) 213 return ERR_PTR(-ENOMEM); 214 215 panel_bridge->connector_type = connector_type; 216 panel_bridge->panel = panel; 217 218 panel_bridge->bridge.funcs = &panel_bridge_bridge_funcs; 219 #ifdef CONFIG_OF 220 panel_bridge->bridge.of_node = panel->dev->of_node; 221 #endif 222 panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES; 223 panel_bridge->bridge.type = connector_type; 224 225 drm_bridge_add(&panel_bridge->bridge); 226 227 return &panel_bridge->bridge; 228 } 229 EXPORT_SYMBOL(drm_panel_bridge_add_typed); 230 231 /** 232 * drm_panel_bridge_remove - Unregisters and frees a drm_bridge 233 * created by drm_panel_bridge_add(). 234 * 235 * @bridge: The drm_bridge being freed. 236 */ 237 void drm_panel_bridge_remove(struct drm_bridge *bridge) 238 { 239 struct panel_bridge *panel_bridge; 240 241 if (!bridge) 242 return; 243 244 if (bridge->funcs != &panel_bridge_bridge_funcs) 245 return; 246 247 panel_bridge = drm_bridge_to_panel_bridge(bridge); 248 249 drm_bridge_remove(bridge); 250 devm_kfree(panel_bridge->panel->dev, bridge); 251 } 252 EXPORT_SYMBOL(drm_panel_bridge_remove); 253 254 static void devm_drm_panel_bridge_release(struct device *dev, void *res) 255 { 256 struct drm_bridge **bridge = res; 257 258 drm_panel_bridge_remove(*bridge); 259 } 260 261 /** 262 * devm_drm_panel_bridge_add - Creates a managed &drm_bridge and &drm_connector 263 * that just calls the appropriate functions from &drm_panel. 264 * @dev: device to tie the bridge lifetime to 265 * @panel: The drm_panel being wrapped. Must be non-NULL. 266 * 267 * This is the managed version of drm_panel_bridge_add() which automatically 268 * calls drm_panel_bridge_remove() when @dev is unbound. 269 */ 270 struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev, 271 struct drm_panel *panel) 272 { 273 if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown)) 274 return ERR_PTR(-EINVAL); 275 276 return devm_drm_panel_bridge_add_typed(dev, panel, 277 panel->connector_type); 278 } 279 EXPORT_SYMBOL(devm_drm_panel_bridge_add); 280 281 /** 282 * devm_drm_panel_bridge_add_typed - Creates a managed &drm_bridge and 283 * &drm_connector with an explicit connector type. 284 * @dev: device to tie the bridge lifetime to 285 * @panel: The drm_panel being wrapped. Must be non-NULL. 286 * @connector_type: The connector type (DRM_MODE_CONNECTOR_*) 287 * 288 * This is just like devm_drm_panel_bridge_add(), but forces the connector type 289 * to @connector_type instead of infering it from the panel. 290 * 291 * This function is deprecated and should not be used in new drivers. Use 292 * devm_drm_panel_bridge_add() instead, and fix panel drivers as necessary if 293 * they don't report a connector type. 294 */ 295 struct drm_bridge *devm_drm_panel_bridge_add_typed(struct device *dev, 296 struct drm_panel *panel, 297 u32 connector_type) 298 { 299 struct drm_bridge **ptr, *bridge; 300 301 ptr = devres_alloc(devm_drm_panel_bridge_release, sizeof(*ptr), 302 GFP_KERNEL); 303 if (!ptr) 304 return ERR_PTR(-ENOMEM); 305 306 bridge = drm_panel_bridge_add_typed(panel, connector_type); 307 if (!IS_ERR(bridge)) { 308 *ptr = bridge; 309 devres_add(dev, ptr); 310 } else { 311 devres_free(ptr); 312 } 313 314 return bridge; 315 } 316 EXPORT_SYMBOL(devm_drm_panel_bridge_add_typed); 317 318 /** 319 * drm_panel_bridge_connector - return the connector for the panel bridge 320 * @bridge: The drm_bridge. 321 * 322 * drm_panel_bridge creates the connector. 323 * This function gives external access to the connector. 324 * 325 * Returns: Pointer to drm_connector 326 */ 327 struct drm_connector *drm_panel_bridge_connector(struct drm_bridge *bridge) 328 { 329 struct panel_bridge *panel_bridge; 330 331 panel_bridge = drm_bridge_to_panel_bridge(bridge); 332 333 return &panel_bridge->connector; 334 } 335 EXPORT_SYMBOL(drm_panel_bridge_connector); 336 337 #ifdef CONFIG_OF 338 /** 339 * devm_drm_of_get_bridge - Return next bridge in the chain 340 * @dev: device to tie the bridge lifetime to 341 * @np: device tree node containing encoder output ports 342 * @port: port in the device tree node 343 * @endpoint: endpoint in the device tree node 344 * 345 * Given a DT node's port and endpoint number, finds the connected node 346 * and returns the associated bridge if any, or creates and returns a 347 * drm panel bridge instance if a panel is connected. 348 * 349 * Returns a pointer to the bridge if successful, or an error pointer 350 * otherwise. 351 */ 352 struct drm_bridge *devm_drm_of_get_bridge(struct device *dev, 353 struct device_node *np, 354 u32 port, u32 endpoint) 355 { 356 struct drm_bridge *bridge; 357 struct drm_panel *panel; 358 int ret; 359 360 ret = drm_of_find_panel_or_bridge(np, port, endpoint, 361 &panel, &bridge); 362 if (ret) 363 return ERR_PTR(ret); 364 365 if (panel) 366 bridge = devm_drm_panel_bridge_add(dev, panel); 367 368 return bridge; 369 } 370 EXPORT_SYMBOL(devm_drm_of_get_bridge); 371 #endif 372