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_managed.h> 12#include <drm/drm_modeset_helper_vtables.h> 13#include <drm/drm_of.h> 14#include <drm/drm_panel.h> 15#include <drm/drm_print.h> 16#include <drm/drm_probe_helper.h> 17 18struct panel_bridge { 19 struct drm_bridge bridge; 20 struct drm_connector connector; 21 struct drm_panel *panel; 22 u32 connector_type; 23}; 24 25static inline struct panel_bridge * 26drm_bridge_to_panel_bridge(struct drm_bridge *bridge) 27{ 28 return container_of(bridge, struct panel_bridge, bridge); 29} 30 31static inline struct panel_bridge * 32drm_connector_to_panel_bridge(struct drm_connector *connector) 33{ 34 return container_of(connector, struct panel_bridge, connector); 35} 36 37static int panel_bridge_connector_get_modes(struct drm_connector *connector) 38{ 39 struct panel_bridge *panel_bridge = 40 drm_connector_to_panel_bridge(connector); 41 42 return drm_panel_get_modes(panel_bridge->panel, connector); 43} 44 45static const struct drm_connector_helper_funcs 46panel_bridge_connector_helper_funcs = { 47 .get_modes = panel_bridge_connector_get_modes, 48}; 49 50static const struct drm_connector_funcs panel_bridge_connector_funcs = { 51 .reset = drm_atomic_helper_connector_reset, 52 .fill_modes = drm_helper_probe_single_connector_modes, 53 .destroy = drm_connector_cleanup, 54 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 55 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 56}; 57 58static int panel_bridge_attach(struct drm_bridge *bridge, 59 enum drm_bridge_attach_flags flags) 60{ 61 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 62 struct drm_connector *connector = &panel_bridge->connector; 63 int ret; 64 65 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) 66 return 0; 67 68 if (!bridge->encoder) { 69 DRM_ERROR("Missing encoder\n"); 70 return -ENODEV; 71 } 72 73 drm_connector_helper_add(connector, 74 &panel_bridge_connector_helper_funcs); 75 76 ret = drm_connector_init(bridge->dev, connector, 77 &panel_bridge_connector_funcs, 78 panel_bridge->connector_type); 79 if (ret) { 80 DRM_ERROR("Failed to initialize connector\n"); 81 return ret; 82 } 83 84 drm_panel_bridge_set_orientation(connector, bridge); 85 86 drm_connector_attach_encoder(&panel_bridge->connector, 87 bridge->encoder); 88 89 if (bridge->dev->registered) { 90 if (connector->funcs->reset) 91 connector->funcs->reset(connector); 92 drm_connector_register(connector); 93 } 94 95 return 0; 96} 97 98static void panel_bridge_detach(struct drm_bridge *bridge) 99{ 100 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 101 struct drm_connector *connector = &panel_bridge->connector; 102 103 /* 104 * Cleanup the connector if we know it was initialized. 105 * 106 * FIXME: This wouldn't be needed if the panel_bridge structure was 107 * allocated with drmm_kzalloc(). This might be tricky since the 108 * drm_device pointer can only be retrieved when the bridge is attached. 109 */ 110 if (connector->dev) 111 drm_connector_cleanup(connector); 112} 113 114static void panel_bridge_atomic_pre_enable(struct drm_bridge *bridge, 115 struct drm_bridge_state *old_bridge_state) 116{ 117 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 118 struct drm_atomic_state *atomic_state = old_bridge_state->base.state; 119 struct drm_encoder *encoder = bridge->encoder; 120 struct drm_crtc *crtc; 121 struct drm_crtc_state *old_crtc_state; 122 123 crtc = drm_atomic_get_new_crtc_for_encoder(atomic_state, encoder); 124 if (!crtc) 125 return; 126 127 old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc); 128 if (old_crtc_state && old_crtc_state->self_refresh_active) 129 return; 130 131 drm_panel_prepare(panel_bridge->panel); 132} 133 134static void panel_bridge_atomic_enable(struct drm_bridge *bridge, 135 struct drm_bridge_state *old_bridge_state) 136{ 137 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 138 struct drm_atomic_state *atomic_state = old_bridge_state->base.state; 139 struct drm_encoder *encoder = bridge->encoder; 140 struct drm_crtc *crtc; 141 struct drm_crtc_state *old_crtc_state; 142 143 crtc = drm_atomic_get_new_crtc_for_encoder(atomic_state, encoder); 144 if (!crtc) 145 return; 146 147 old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc); 148 if (old_crtc_state && old_crtc_state->self_refresh_active) 149 return; 150 151 drm_panel_enable(panel_bridge->panel); 152} 153 154static void panel_bridge_atomic_disable(struct drm_bridge *bridge, 155 struct drm_bridge_state *old_bridge_state) 156{ 157 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 158 struct drm_atomic_state *atomic_state = old_bridge_state->base.state; 159 struct drm_encoder *encoder = bridge->encoder; 160 struct drm_crtc *crtc; 161 struct drm_crtc_state *new_crtc_state; 162 163 crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state, encoder); 164 if (!crtc) 165 return; 166 167 new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc); 168 if (new_crtc_state && new_crtc_state->self_refresh_active) 169 return; 170 171 drm_panel_disable(panel_bridge->panel); 172} 173 174static void panel_bridge_atomic_post_disable(struct drm_bridge *bridge, 175 struct drm_bridge_state *old_bridge_state) 176{ 177 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 178 struct drm_atomic_state *atomic_state = old_bridge_state->base.state; 179 struct drm_encoder *encoder = bridge->encoder; 180 struct drm_crtc *crtc; 181 struct drm_crtc_state *new_crtc_state; 182 183 crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state, encoder); 184 if (!crtc) 185 return; 186 187 new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc); 188 if (new_crtc_state && new_crtc_state->self_refresh_active) 189 return; 190 191 drm_panel_unprepare(panel_bridge->panel); 192} 193 194static int panel_bridge_get_modes(struct drm_bridge *bridge, 195 struct drm_connector *connector) 196{ 197 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 198 199 return drm_panel_get_modes(panel_bridge->panel, connector); 200} 201 202static void panel_bridge_debugfs_init(struct drm_bridge *bridge, 203 struct dentry *root) 204{ 205 struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge); 206 struct drm_panel *panel = panel_bridge->panel; 207 208 root = debugfs_create_dir("panel", root); 209 if (panel->funcs->debugfs_init) 210 panel->funcs->debugfs_init(panel, root); 211} 212 213static const struct drm_bridge_funcs panel_bridge_bridge_funcs = { 214 .attach = panel_bridge_attach, 215 .detach = panel_bridge_detach, 216 .atomic_pre_enable = panel_bridge_atomic_pre_enable, 217 .atomic_enable = panel_bridge_atomic_enable, 218 .atomic_disable = panel_bridge_atomic_disable, 219 .atomic_post_disable = panel_bridge_atomic_post_disable, 220 .get_modes = panel_bridge_get_modes, 221 .atomic_reset = drm_atomic_helper_bridge_reset, 222 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 223 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 224 .atomic_get_input_bus_fmts = drm_atomic_helper_bridge_propagate_bus_fmt, 225 .debugfs_init = panel_bridge_debugfs_init, 226}; 227 228/** 229 * drm_bridge_is_panel - Checks if a drm_bridge is a panel_bridge. 230 * 231 * @bridge: The drm_bridge to be checked. 232 * 233 * Returns true if the bridge is a panel bridge, or false otherwise. 234 */ 235bool drm_bridge_is_panel(const struct drm_bridge *bridge) 236{ 237 return bridge->funcs == &panel_bridge_bridge_funcs; 238} 239EXPORT_SYMBOL(drm_bridge_is_panel); 240 241/** 242 * drm_panel_bridge_add - Creates a &drm_bridge and &drm_connector that 243 * just calls the appropriate functions from &drm_panel. 244 * 245 * @panel: The drm_panel being wrapped. Must be non-NULL. 246 * 247 * For drivers converting from directly using drm_panel: The expected 248 * usage pattern is that during either encoder module probe or DSI 249 * host attach, a drm_panel will be looked up through 250 * drm_of_find_panel_or_bridge(). drm_panel_bridge_add() is used to 251 * wrap that panel in the new bridge, and the result can then be 252 * passed to drm_bridge_attach(). The drm_panel_prepare() and related 253 * functions can be dropped from the encoder driver (they're now 254 * called by the KMS helpers before calling into the encoder), along 255 * with connector creation. When done with the bridge (after 256 * drm_mode_config_cleanup() if the bridge has already been attached), then 257 * drm_panel_bridge_remove() to free it. 258 * 259 * The connector type is set to @panel->connector_type, which must be set to a 260 * known type. Calling this function with a panel whose connector type is 261 * DRM_MODE_CONNECTOR_Unknown will return ERR_PTR(-EINVAL). 262 * 263 * See devm_drm_panel_bridge_add() for an automatically managed version of this 264 * function. 265 */ 266struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel) 267{ 268 if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown)) 269 return ERR_PTR(-EINVAL); 270 271 return drm_panel_bridge_add_typed(panel, panel->connector_type); 272} 273EXPORT_SYMBOL(drm_panel_bridge_add); 274 275/** 276 * drm_panel_bridge_add_typed - Creates a &drm_bridge and &drm_connector with 277 * an explicit connector type. 278 * @panel: The drm_panel being wrapped. Must be non-NULL. 279 * @connector_type: The connector type (DRM_MODE_CONNECTOR_*) 280 * 281 * This is just like drm_panel_bridge_add(), but forces the connector type to 282 * @connector_type instead of infering it from the panel. 283 * 284 * This function is deprecated and should not be used in new drivers. Use 285 * drm_panel_bridge_add() instead, and fix panel drivers as necessary if they 286 * don't report a connector type. 287 */ 288struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel, 289 u32 connector_type) 290{ 291 struct panel_bridge *panel_bridge; 292 293 if (!panel) 294 return ERR_PTR(-EINVAL); 295 296 panel_bridge = devm_kzalloc(panel->dev, sizeof(*panel_bridge), 297 GFP_KERNEL); 298 if (!panel_bridge) 299 return ERR_PTR(-ENOMEM); 300 301 panel_bridge->connector_type = connector_type; 302 panel_bridge->panel = panel; 303 304 panel_bridge->bridge.funcs = &panel_bridge_bridge_funcs; 305#ifdef CONFIG_OF 306 panel_bridge->bridge.of_node = panel->dev->of_node; 307#endif 308 panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES; 309 panel_bridge->bridge.type = connector_type; 310 311 drm_bridge_add(&panel_bridge->bridge); 312 313 return &panel_bridge->bridge; 314} 315EXPORT_SYMBOL(drm_panel_bridge_add_typed); 316 317/** 318 * drm_panel_bridge_remove - Unregisters and frees a drm_bridge 319 * created by drm_panel_bridge_add(). 320 * 321 * @bridge: The drm_bridge being freed. 322 */ 323void drm_panel_bridge_remove(struct drm_bridge *bridge) 324{ 325 struct panel_bridge *panel_bridge; 326 327 if (!bridge) 328 return; 329 330 if (bridge->funcs != &panel_bridge_bridge_funcs) 331 return; 332 333 panel_bridge = drm_bridge_to_panel_bridge(bridge); 334 335 drm_bridge_remove(bridge); 336 devm_kfree(panel_bridge->panel->dev, bridge); 337} 338EXPORT_SYMBOL(drm_panel_bridge_remove); 339 340/** 341 * drm_panel_bridge_set_orientation - Set the connector's panel orientation 342 * from the bridge that can be transformed to panel bridge. 343 * 344 * @connector: The connector to be set panel orientation. 345 * @bridge: The drm_bridge to be transformed to panel bridge. 346 * 347 * Returns 0 on success, negative errno on failure. 348 */ 349int drm_panel_bridge_set_orientation(struct drm_connector *connector, 350 struct drm_bridge *bridge) 351{ 352 struct panel_bridge *panel_bridge; 353 354 panel_bridge = drm_bridge_to_panel_bridge(bridge); 355 356 return drm_connector_set_orientation_from_panel(connector, 357 panel_bridge->panel); 358} 359EXPORT_SYMBOL(drm_panel_bridge_set_orientation); 360 361static void devm_drm_panel_bridge_release(struct device *dev, void *res) 362{ 363 struct drm_bridge **bridge = res; 364 365 drm_panel_bridge_remove(*bridge); 366} 367 368/** 369 * devm_drm_panel_bridge_add - Creates a managed &drm_bridge and &drm_connector 370 * that just calls the appropriate functions from &drm_panel. 371 * @dev: device to tie the bridge lifetime to 372 * @panel: The drm_panel being wrapped. Must be non-NULL. 373 * 374 * This is the managed version of drm_panel_bridge_add() which automatically 375 * calls drm_panel_bridge_remove() when @dev is unbound. 376 */ 377struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev, 378 struct drm_panel *panel) 379{ 380 if (WARN_ON(panel->connector_type == DRM_MODE_CONNECTOR_Unknown)) 381 return ERR_PTR(-EINVAL); 382 383 return devm_drm_panel_bridge_add_typed(dev, panel, 384 panel->connector_type); 385} 386EXPORT_SYMBOL(devm_drm_panel_bridge_add); 387 388/** 389 * devm_drm_panel_bridge_add_typed - Creates a managed &drm_bridge and 390 * &drm_connector with an explicit connector type. 391 * @dev: device to tie the bridge lifetime to 392 * @panel: The drm_panel being wrapped. Must be non-NULL. 393 * @connector_type: The connector type (DRM_MODE_CONNECTOR_*) 394 * 395 * This is just like devm_drm_panel_bridge_add(), but forces the connector type 396 * to @connector_type instead of infering it from the panel. 397 * 398 * This function is deprecated and should not be used in new drivers. Use 399 * devm_drm_panel_bridge_add() instead, and fix panel drivers as necessary if 400 * they don't report a connector type. 401 */ 402struct drm_bridge *devm_drm_panel_bridge_add_typed(struct device *dev, 403 struct drm_panel *panel, 404 u32 connector_type) 405{ 406 struct drm_bridge **ptr, *bridge; 407 408 ptr = devres_alloc(devm_drm_panel_bridge_release, sizeof(*ptr), 409 GFP_KERNEL); 410 if (!ptr) 411 return ERR_PTR(-ENOMEM); 412 413 bridge = drm_panel_bridge_add_typed(panel, connector_type); 414 if (IS_ERR(bridge)) { 415 devres_free(ptr); 416 return bridge; 417 } 418 419 bridge->pre_enable_prev_first = panel->prepare_prev_first; 420 421 *ptr = bridge; 422 devres_add(dev, ptr); 423 424 return bridge; 425} 426EXPORT_SYMBOL(devm_drm_panel_bridge_add_typed); 427 428static void drmm_drm_panel_bridge_release(struct drm_device *drm, void *ptr) 429{ 430 struct drm_bridge *bridge = ptr; 431 432 drm_panel_bridge_remove(bridge); 433} 434 435/** 436 * drmm_panel_bridge_add - Creates a DRM-managed &drm_bridge and 437 * &drm_connector that just calls the 438 * appropriate functions from &drm_panel. 439 * 440 * @drm: DRM device to tie the bridge lifetime to 441 * @panel: The drm_panel being wrapped. Must be non-NULL. 442 * 443 * This is the DRM-managed version of drm_panel_bridge_add() which 444 * automatically calls drm_panel_bridge_remove() when @dev is cleaned 445 * up. 446 */ 447struct drm_bridge *drmm_panel_bridge_add(struct drm_device *drm, 448 struct drm_panel *panel) 449{ 450 struct drm_bridge *bridge; 451 int ret; 452 453 bridge = drm_panel_bridge_add_typed(panel, panel->connector_type); 454 if (IS_ERR(bridge)) 455 return bridge; 456 457 ret = drmm_add_action_or_reset(drm, drmm_drm_panel_bridge_release, 458 bridge); 459 if (ret) 460 return ERR_PTR(ret); 461 462 bridge->pre_enable_prev_first = panel->prepare_prev_first; 463 464 return bridge; 465} 466EXPORT_SYMBOL(drmm_panel_bridge_add); 467 468/** 469 * drm_panel_bridge_connector - return the connector for the panel bridge 470 * @bridge: The drm_bridge. 471 * 472 * drm_panel_bridge creates the connector. 473 * This function gives external access to the connector. 474 * 475 * Returns: Pointer to drm_connector 476 */ 477struct drm_connector *drm_panel_bridge_connector(struct drm_bridge *bridge) 478{ 479 struct panel_bridge *panel_bridge; 480 481 panel_bridge = drm_bridge_to_panel_bridge(bridge); 482 483 return &panel_bridge->connector; 484} 485EXPORT_SYMBOL(drm_panel_bridge_connector); 486 487#ifdef CONFIG_OF 488/** 489 * devm_drm_of_get_bridge - Return next bridge in the chain 490 * @dev: device to tie the bridge lifetime to 491 * @np: device tree node containing encoder output ports 492 * @port: port in the device tree node 493 * @endpoint: endpoint in the device tree node 494 * 495 * Given a DT node's port and endpoint number, finds the connected node 496 * and returns the associated bridge if any, or creates and returns a 497 * drm panel bridge instance if a panel is connected. 498 * 499 * Returns a pointer to the bridge if successful, or an error pointer 500 * otherwise. 501 */ 502struct drm_bridge *devm_drm_of_get_bridge(struct device *dev, 503 struct device_node *np, 504 u32 port, u32 endpoint) 505{ 506 struct drm_bridge *bridge; 507 struct drm_panel *panel; 508 int ret; 509 510 ret = drm_of_find_panel_or_bridge(np, port, endpoint, 511 &panel, &bridge); 512 if (ret) 513 return ERR_PTR(ret); 514 515 if (panel) 516 bridge = devm_drm_panel_bridge_add(dev, panel); 517 518 return bridge; 519} 520EXPORT_SYMBOL(devm_drm_of_get_bridge); 521 522/** 523 * drmm_of_get_bridge - Return next bridge in the chain 524 * @drm: device to tie the bridge lifetime to 525 * @np: device tree node containing encoder output ports 526 * @port: port in the device tree node 527 * @endpoint: endpoint in the device tree node 528 * 529 * Given a DT node's port and endpoint number, finds the connected node 530 * and returns the associated bridge if any, or creates and returns a 531 * drm panel bridge instance if a panel is connected. 532 * 533 * Returns a drmm managed pointer to the bridge if successful, or an error 534 * pointer otherwise. 535 */ 536struct drm_bridge *drmm_of_get_bridge(struct drm_device *drm, 537 struct device_node *np, 538 u32 port, u32 endpoint) 539{ 540 struct drm_bridge *bridge; 541 struct drm_panel *panel; 542 int ret; 543 544 ret = drm_of_find_panel_or_bridge(np, port, endpoint, 545 &panel, &bridge); 546 if (ret) 547 return ERR_PTR(ret); 548 549 if (panel) 550 bridge = drmm_panel_bridge_add(drm, panel); 551 552 return bridge; 553} 554EXPORT_SYMBOL(drmm_of_get_bridge); 555 556#endif 557