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 if (bridge->dev->registered) { 87 if (connector->funcs->reset) 88 connector->funcs->reset(connector); 89 drm_connector_register(connector); 90 } 91 92 return 0; 93 } 94 95 static void panel_bridge_detach(struct drm_bridge *bridge) 96 { 97 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 98 struct drm_connector *connector = &panel_bridge->connector; 99 100 /* 101 * Cleanup the connector if we know it was initialized. 102 * 103 * FIXME: This wouldn't be needed if the panel_bridge structure was 104 * allocated with drmm_kzalloc(). This might be tricky since the 105 * drm_device pointer can only be retrieved when the bridge is attached. 106 */ 107 if (connector->dev) 108 drm_connector_cleanup(connector); 109 } 110 111 static void panel_bridge_pre_enable(struct drm_bridge *bridge) 112 { 113 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 114 115 drm_panel_prepare(panel_bridge->panel); 116 } 117 118 static void panel_bridge_enable(struct drm_bridge *bridge) 119 { 120 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 121 122 drm_panel_enable(panel_bridge->panel); 123 } 124 125 static void panel_bridge_disable(struct drm_bridge *bridge) 126 { 127 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 128 129 drm_panel_disable(panel_bridge->panel); 130 } 131 132 static void panel_bridge_post_disable(struct drm_bridge *bridge) 133 { 134 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 135 136 drm_panel_unprepare(panel_bridge->panel); 137 } 138 139 static int panel_bridge_get_modes(struct drm_bridge *bridge, 140 struct drm_connector *connector) 141 { 142 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 143 144 return drm_panel_get_modes(panel_bridge->panel, connector); 145 } 146 147 static void panel_bridge_debugfs_init(struct drm_bridge *bridge, 148 struct dentry *root) 149 { 150 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 151 struct drm_panel *panel = panel_bridge->panel; 152 153 root = debugfs_create_dir("panel", root); 154 if (panel->funcs->debugfs_init) 155 panel->funcs->debugfs_init(panel, root); 156 } 157 158 static const struct drm_bridge_funcs panel_bridge_bridge_funcs = { 159 .attach = panel_bridge_attach, 160 .detach = panel_bridge_detach, 161 .pre_enable = panel_bridge_pre_enable, 162 .enable = panel_bridge_enable, 163 .disable = panel_bridge_disable, 164 .post_disable = panel_bridge_post_disable, 165 .get_modes = panel_bridge_get_modes, 166 .atomic_reset = drm_atomic_helper_bridge_reset, 167 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 168 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 169 .atomic_get_input_bus_fmts = drm_atomic_helper_bridge_propagate_bus_fmt, 170 .debugfs_init = panel_bridge_debugfs_init, 171 }; 172 173 /** 174 * drm_panel_bridge_add - Creates a &drm_bridge and &drm_connector that 175 * just calls the appropriate functions from &drm_panel. 176 * 177 * @panel: The drm_panel being wrapped. Must be non-NULL. 178 * 179 * For drivers converting from directly using drm_panel: The expected 180 * usage pattern is that during either encoder module probe or DSI 181 * host attach, a drm_panel will be looked up through 182 * drm_of_find_panel_or_bridge(). drm_panel_bridge_add() is used to 183 * wrap that panel in the new bridge, and the result can then be 184 * passed to drm_bridge_attach(). The drm_panel_prepare() and related 185 * functions can be dropped from the encoder driver (they're now 186 * called by the KMS helpers before calling into the encoder), along 187 * with connector creation. When done with the bridge (after 188 * drm_mode_config_cleanup() if the bridge has already been attached), then 189 * drm_panel_bridge_remove() to free it. 190 * 191 * The connector type is set to @panel->connector_type, which must be set to a 192 * known type. Calling this function with a panel whose connector type is 193 * DRM_MODE_CONNECTOR_Unknown will return ERR_PTR(-EINVAL). 194 * 195 * See devm_drm_panel_bridge_add() for an automatically managed version of this 196 * function. 197 */ 198 struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel) 199 { 200 if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown)) 201 return ERR_PTR(-EINVAL); 202 203 return drm_panel_bridge_add_typed(panel, panel->connector_type); 204 } 205 EXPORT_SYMBOL(drm_panel_bridge_add); 206 207 /** 208 * drm_panel_bridge_add_typed - Creates a &drm_bridge and &drm_connector with 209 * an explicit connector type. 210 * @panel: The drm_panel being wrapped. Must be non-NULL. 211 * @connector_type: The connector type (DRM_MODE_CONNECTOR_*) 212 * 213 * This is just like drm_panel_bridge_add(), but forces the connector type to 214 * @connector_type instead of infering it from the panel. 215 * 216 * This function is deprecated and should not be used in new drivers. Use 217 * drm_panel_bridge_add() instead, and fix panel drivers as necessary if they 218 * don't report a connector type. 219 */ 220 struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel, 221 u32 connector_type) 222 { 223 struct panel_bridge *panel_bridge; 224 225 if (!panel) 226 return ERR_PTR(-EINVAL); 227 228 panel_bridge = devm_kzalloc(panel->dev, sizeof(*panel_bridge), 229 GFP_KERNEL); 230 if (!panel_bridge) 231 return ERR_PTR(-ENOMEM); 232 233 panel_bridge->connector_type = connector_type; 234 panel_bridge->panel = panel; 235 236 panel_bridge->bridge.funcs = &panel_bridge_bridge_funcs; 237 #ifdef CONFIG_OF 238 panel_bridge->bridge.of_node = panel->dev->of_node; 239 #endif 240 panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES; 241 panel_bridge->bridge.type = connector_type; 242 243 drm_bridge_add(&panel_bridge->bridge); 244 245 return &panel_bridge->bridge; 246 } 247 EXPORT_SYMBOL(drm_panel_bridge_add_typed); 248 249 /** 250 * drm_panel_bridge_remove - Unregisters and frees a drm_bridge 251 * created by drm_panel_bridge_add(). 252 * 253 * @bridge: The drm_bridge being freed. 254 */ 255 void drm_panel_bridge_remove(struct drm_bridge *bridge) 256 { 257 struct panel_bridge *panel_bridge; 258 259 if (!bridge) 260 return; 261 262 if (bridge->funcs != &panel_bridge_bridge_funcs) 263 return; 264 265 panel_bridge = drm_bridge_to_panel_bridge(bridge); 266 267 drm_bridge_remove(bridge); 268 devm_kfree(panel_bridge->panel->dev, bridge); 269 } 270 EXPORT_SYMBOL(drm_panel_bridge_remove); 271 272 static void devm_drm_panel_bridge_release(struct device *dev, void *res) 273 { 274 struct drm_bridge **bridge = res; 275 276 drm_panel_bridge_remove(*bridge); 277 } 278 279 /** 280 * devm_drm_panel_bridge_add - Creates a managed &drm_bridge and &drm_connector 281 * that just calls the appropriate functions from &drm_panel. 282 * @dev: device to tie the bridge lifetime to 283 * @panel: The drm_panel being wrapped. Must be non-NULL. 284 * 285 * This is the managed version of drm_panel_bridge_add() which automatically 286 * calls drm_panel_bridge_remove() when @dev is unbound. 287 */ 288 struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev, 289 struct drm_panel *panel) 290 { 291 if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown)) 292 return ERR_PTR(-EINVAL); 293 294 return devm_drm_panel_bridge_add_typed(dev, panel, 295 panel->connector_type); 296 } 297 EXPORT_SYMBOL(devm_drm_panel_bridge_add); 298 299 /** 300 * devm_drm_panel_bridge_add_typed - Creates a managed &drm_bridge and 301 * &drm_connector with an explicit connector type. 302 * @dev: device to tie the bridge lifetime to 303 * @panel: The drm_panel being wrapped. Must be non-NULL. 304 * @connector_type: The connector type (DRM_MODE_CONNECTOR_*) 305 * 306 * This is just like devm_drm_panel_bridge_add(), but forces the connector type 307 * to @connector_type instead of infering it from the panel. 308 * 309 * This function is deprecated and should not be used in new drivers. Use 310 * devm_drm_panel_bridge_add() instead, and fix panel drivers as necessary if 311 * they don't report a connector type. 312 */ 313 struct drm_bridge *devm_drm_panel_bridge_add_typed(struct device *dev, 314 struct drm_panel *panel, 315 u32 connector_type) 316 { 317 struct drm_bridge **ptr, *bridge; 318 319 ptr = devres_alloc(devm_drm_panel_bridge_release, sizeof(*ptr), 320 GFP_KERNEL); 321 if (!ptr) 322 return ERR_PTR(-ENOMEM); 323 324 bridge = drm_panel_bridge_add_typed(panel, connector_type); 325 if (!IS_ERR(bridge)) { 326 *ptr = bridge; 327 devres_add(dev, ptr); 328 } else { 329 devres_free(ptr); 330 } 331 332 return bridge; 333 } 334 EXPORT_SYMBOL(devm_drm_panel_bridge_add_typed); 335 336 /** 337 * drm_panel_bridge_connector - return the connector for the panel bridge 338 * @bridge: The drm_bridge. 339 * 340 * drm_panel_bridge creates the connector. 341 * This function gives external access to the connector. 342 * 343 * Returns: Pointer to drm_connector 344 */ 345 struct drm_connector *drm_panel_bridge_connector(struct drm_bridge *bridge) 346 { 347 struct panel_bridge *panel_bridge; 348 349 panel_bridge = drm_bridge_to_panel_bridge(bridge); 350 351 return &panel_bridge->connector; 352 } 353 EXPORT_SYMBOL(drm_panel_bridge_connector); 354 355 #ifdef CONFIG_OF 356 /** 357 * devm_drm_of_get_bridge - Return next bridge in the chain 358 * @dev: device to tie the bridge lifetime to 359 * @np: device tree node containing encoder output ports 360 * @port: port in the device tree node 361 * @endpoint: endpoint in the device tree node 362 * 363 * Given a DT node's port and endpoint number, finds the connected node 364 * and returns the associated bridge if any, or creates and returns a 365 * drm panel bridge instance if a panel is connected. 366 * 367 * Returns a pointer to the bridge if successful, or an error pointer 368 * otherwise. 369 */ 370 struct drm_bridge *devm_drm_of_get_bridge(struct device *dev, 371 struct device_node *np, 372 u32 port, u32 endpoint) 373 { 374 struct drm_bridge *bridge; 375 struct drm_panel *panel; 376 int ret; 377 378 ret = drm_of_find_panel_or_bridge(np, port, endpoint, 379 &panel, &bridge); 380 if (ret) 381 return ERR_PTR(ret); 382 383 if (panel) 384 bridge = devm_drm_panel_bridge_add(dev, panel); 385 386 return bridge; 387 } 388 EXPORT_SYMBOL(devm_drm_of_get_bridge); 389 #endif 390