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drm_bridge.h
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linux-6.19.14/include/drm/drm_bridge.h
1/* 2 * Copyright (c) 2016 Intel Corporation 3 * 4 * Permission to use, copy, modify, distribute, and sell this software and its 5 * documentation for any purpose is hereby granted without fee, provided that 6 * the above copyright notice appear in all copies and that both that copyright 7 * notice and this permission notice appear in supporting documentation, and 8 * that the name of the copyright holders not be used in advertising or 9 * publicity pertaining to distribution of the software without specific, 10 * written prior permission. The copyright holders make no representations 11 * about the suitability of this software for any purpose. It is provided "as 12 * is" without express or implied warranty. 13 * 14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 20 * OF THIS SOFTWARE. 21 */ 22 23#ifndef __DRM_BRIDGE_H__ 24#define __DRM_BRIDGE_H__ 25 26#include <linux/cleanup.h> 27#include <linux/ctype.h> 28#include <linux/list.h> 29#include <linux/mutex.h> 30 31#include <drm/drm_atomic.h> 32#include <drm/drm_encoder.h> 33#include <drm/drm_mode_object.h> 34#include <drm/drm_modes.h> 35 36struct cec_msg; 37struct device_node; 38 39struct drm_bridge; 40struct drm_bridge_timings; 41struct drm_connector; 42struct drm_display_info; 43struct drm_minor; 44struct drm_panel; 45struct edid; 46struct hdmi_codec_daifmt; 47struct hdmi_codec_params; 48struct i2c_adapter; 49 50/** 51 * enum drm_bridge_attach_flags - Flags for &drm_bridge_funcs.attach 52 */ 53enum drm_bridge_attach_flags { 54 /** 55 * @DRM_BRIDGE_ATTACH_NO_CONNECTOR: When this flag is set the bridge 56 * shall not create a drm_connector. 57 */ 58 DRM_BRIDGE_ATTACH_NO_CONNECTOR = BIT(0), 59}; 60 61/** 62 * struct drm_bridge_funcs - drm_bridge control functions 63 */ 64struct drm_bridge_funcs { 65 /** 66 * @attach: 67 * 68 * This callback is invoked whenever our bridge is being attached to a 69 * &drm_encoder. The flags argument tunes the behaviour of the attach 70 * operation (see DRM_BRIDGE_ATTACH_*). 71 * 72 * The @attach callback is optional. 73 * 74 * RETURNS: 75 * 76 * Zero on success, error code on failure. 77 */ 78 int (*attach)(struct drm_bridge *bridge, struct drm_encoder *encoder, 79 enum drm_bridge_attach_flags flags); 80 81 /** 82 * @destroy: 83 * 84 * This callback is invoked when the bridge is about to be 85 * deallocated. 86 * 87 * The @destroy callback is optional. 88 */ 89 void (*destroy)(struct drm_bridge *bridge); 90 91 /** 92 * @detach: 93 * 94 * This callback is invoked whenever our bridge is being detached from a 95 * &drm_encoder. 96 * 97 * The @detach callback is optional. 98 */ 99 void (*detach)(struct drm_bridge *bridge); 100 101 /** 102 * @mode_valid: 103 * 104 * This callback is used to check if a specific mode is valid in this 105 * bridge. This should be implemented if the bridge has some sort of 106 * restriction in the modes it can display. For example, a given bridge 107 * may be responsible to set a clock value. If the clock can not 108 * produce all the values for the available modes then this callback 109 * can be used to restrict the number of modes to only the ones that 110 * can be displayed. 111 * 112 * This hook is used by the probe helpers to filter the mode list in 113 * drm_helper_probe_single_connector_modes(), and it is used by the 114 * atomic helpers to validate modes supplied by userspace in 115 * drm_atomic_helper_check_modeset(). 116 * 117 * The @mode_valid callback is optional. 118 * 119 * NOTE: 120 * 121 * Since this function is both called from the check phase of an atomic 122 * commit, and the mode validation in the probe paths it is not allowed 123 * to look at anything else but the passed-in mode, and validate it 124 * against configuration-invariant hardware constraints. Any further 125 * limits which depend upon the configuration can only be checked in 126 * @mode_fixup. 127 * 128 * RETURNS: 129 * 130 * drm_mode_status Enum 131 */ 132 enum drm_mode_status (*mode_valid)(struct drm_bridge *bridge, 133 const struct drm_display_info *info, 134 const struct drm_display_mode *mode); 135 136 /** 137 * @mode_fixup: 138 * 139 * This callback is used to validate and adjust a mode. The parameter 140 * mode is the display mode that should be fed to the next element in 141 * the display chain, either the final &drm_connector or the next 142 * &drm_bridge. The parameter adjusted_mode is the input mode the bridge 143 * requires. It can be modified by this callback and does not need to 144 * match mode. See also &drm_crtc_state.adjusted_mode for more details. 145 * 146 * This is the only hook that allows a bridge to reject a modeset. If 147 * this function passes all other callbacks must succeed for this 148 * configuration. 149 * 150 * The mode_fixup callback is optional. &drm_bridge_funcs.mode_fixup() 151 * is not called when &drm_bridge_funcs.atomic_check() is implemented, 152 * so only one of them should be provided. 153 * 154 * NOTE: 155 * 156 * This function is called in the check phase of atomic modesets, which 157 * can be aborted for any reason (including on userspace's request to 158 * just check whether a configuration would be possible). Drivers MUST 159 * NOT touch any persistent state (hardware or software) or data 160 * structures except the passed in @state parameter. 161 * 162 * Also beware that userspace can request its own custom modes, neither 163 * core nor helpers filter modes to the list of probe modes reported by 164 * the GETCONNECTOR IOCTL and stored in &drm_connector.modes. To ensure 165 * that modes are filtered consistently put any bridge constraints and 166 * limits checks into @mode_valid. 167 * 168 * RETURNS: 169 * 170 * True if an acceptable configuration is possible, false if the modeset 171 * operation should be rejected. 172 */ 173 bool (*mode_fixup)(struct drm_bridge *bridge, 174 const struct drm_display_mode *mode, 175 struct drm_display_mode *adjusted_mode); 176 /** 177 * @disable: 178 * 179 * This callback should disable the bridge. It is called right before 180 * the preceding element in the display pipe is disabled. If the 181 * preceding element is a bridge this means it's called before that 182 * bridge's @disable vfunc. If the preceding element is a &drm_encoder 183 * it's called right before the &drm_encoder_helper_funcs.disable, 184 * &drm_encoder_helper_funcs.prepare or &drm_encoder_helper_funcs.dpms 185 * hook. 186 * 187 * The bridge can assume that the display pipe (i.e. clocks and timing 188 * signals) feeding it is still running when this callback is called. 189 * 190 * The @disable callback is optional. 191 * 192 * NOTE: 193 * 194 * This is deprecated, do not use! 195 * New drivers shall use &drm_bridge_funcs.atomic_disable. 196 */ 197 void (*disable)(struct drm_bridge *bridge); 198 199 /** 200 * @post_disable: 201 * 202 * This callback should disable the bridge. It is called right after the 203 * preceding element in the display pipe is disabled. If the preceding 204 * element is a bridge this means it's called after that bridge's 205 * @post_disable function. If the preceding element is a &drm_encoder 206 * it's called right after the encoder's 207 * &drm_encoder_helper_funcs.disable, &drm_encoder_helper_funcs.prepare 208 * or &drm_encoder_helper_funcs.dpms hook. 209 * 210 * The bridge must assume that the display pipe (i.e. clocks and timing 211 * signals) feeding it is no longer running when this callback is 212 * called. 213 * 214 * The @post_disable callback is optional. 215 * 216 * NOTE: 217 * 218 * This is deprecated, do not use! 219 * New drivers shall use &drm_bridge_funcs.atomic_post_disable. 220 */ 221 void (*post_disable)(struct drm_bridge *bridge); 222 223 /** 224 * @mode_set: 225 * 226 * This callback should set the given mode on the bridge. It is called 227 * after the @mode_set callback for the preceding element in the display 228 * pipeline has been called already. If the bridge is the first element 229 * then this would be &drm_encoder_helper_funcs.mode_set. The display 230 * pipe (i.e. clocks and timing signals) is off when this function is 231 * called. 232 * 233 * The adjusted_mode parameter is the mode output by the CRTC for the 234 * first bridge in the chain. It can be different from the mode 235 * parameter that contains the desired mode for the connector at the end 236 * of the bridges chain, for instance when the first bridge in the chain 237 * performs scaling. The adjusted mode is mostly useful for the first 238 * bridge in the chain and is likely irrelevant for the other bridges. 239 * 240 * For atomic drivers the adjusted_mode is the mode stored in 241 * &drm_crtc_state.adjusted_mode. 242 * 243 * NOTE: 244 * 245 * This is deprecated, do not use! 246 * New drivers shall set their mode in the 247 * &drm_bridge_funcs.atomic_enable operation. 248 */ 249 void (*mode_set)(struct drm_bridge *bridge, 250 const struct drm_display_mode *mode, 251 const struct drm_display_mode *adjusted_mode); 252 /** 253 * @pre_enable: 254 * 255 * This callback should enable the bridge. It is called right before 256 * the preceding element in the display pipe is enabled. If the 257 * preceding element is a bridge this means it's called before that 258 * bridge's @pre_enable function. If the preceding element is a 259 * &drm_encoder it's called right before the encoder's 260 * &drm_encoder_helper_funcs.enable, &drm_encoder_helper_funcs.commit or 261 * &drm_encoder_helper_funcs.dpms hook. 262 * 263 * The display pipe (i.e. clocks and timing signals) feeding this bridge 264 * will not yet be running when this callback is called. The bridge must 265 * not enable the display link feeding the next bridge in the chain (if 266 * there is one) when this callback is called. 267 * 268 * The @pre_enable callback is optional. 269 * 270 * NOTE: 271 * 272 * This is deprecated, do not use! 273 * New drivers shall use &drm_bridge_funcs.atomic_pre_enable. 274 */ 275 void (*pre_enable)(struct drm_bridge *bridge); 276 277 /** 278 * @enable: 279 * 280 * This callback should enable the bridge. It is called right after 281 * the preceding element in the display pipe is enabled. If the 282 * preceding element is a bridge this means it's called after that 283 * bridge's @enable function. If the preceding element is a 284 * &drm_encoder it's called right after the encoder's 285 * &drm_encoder_helper_funcs.enable, &drm_encoder_helper_funcs.commit or 286 * &drm_encoder_helper_funcs.dpms hook. 287 * 288 * The bridge can assume that the display pipe (i.e. clocks and timing 289 * signals) feeding it is running when this callback is called. This 290 * callback must enable the display link feeding the next bridge in the 291 * chain if there is one. 292 * 293 * The @enable callback is optional. 294 * 295 * NOTE: 296 * 297 * This is deprecated, do not use! 298 * New drivers shall use &drm_bridge_funcs.atomic_enable. 299 */ 300 void (*enable)(struct drm_bridge *bridge); 301 302 /** 303 * @atomic_pre_enable: 304 * 305 * This callback should enable the bridge. It is called right before 306 * the preceding element in the display pipe is enabled. If the 307 * preceding element is a bridge this means it's called before that 308 * bridge's @atomic_pre_enable or @pre_enable function. If the preceding 309 * element is a &drm_encoder it's called right before the encoder's 310 * &drm_encoder_helper_funcs.atomic_enable hook. 311 * 312 * The display pipe (i.e. clocks and timing signals) feeding this bridge 313 * will not yet be running when this callback is called. The bridge must 314 * not enable the display link feeding the next bridge in the chain (if 315 * there is one) when this callback is called. 316 * 317 * The @atomic_pre_enable callback is optional. 318 */ 319 void (*atomic_pre_enable)(struct drm_bridge *bridge, 320 struct drm_atomic_state *state); 321 322 /** 323 * @atomic_enable: 324 * 325 * This callback should enable the bridge. It is called right after 326 * the preceding element in the display pipe is enabled. If the 327 * preceding element is a bridge this means it's called after that 328 * bridge's @atomic_enable or @enable function. If the preceding element 329 * is a &drm_encoder it's called right after the encoder's 330 * &drm_encoder_helper_funcs.atomic_enable hook. 331 * 332 * The bridge can assume that the display pipe (i.e. clocks and timing 333 * signals) feeding it is running when this callback is called. This 334 * callback must enable the display link feeding the next bridge in the 335 * chain if there is one. 336 * 337 * The @atomic_enable callback is optional. 338 */ 339 void (*atomic_enable)(struct drm_bridge *bridge, 340 struct drm_atomic_state *state); 341 /** 342 * @atomic_disable: 343 * 344 * This callback should disable the bridge. It is called right before 345 * the preceding element in the display pipe is disabled. If the 346 * preceding element is a bridge this means it's called before that 347 * bridge's @atomic_disable or @disable vfunc. If the preceding element 348 * is a &drm_encoder it's called right before the 349 * &drm_encoder_helper_funcs.atomic_disable hook. 350 * 351 * The bridge can assume that the display pipe (i.e. clocks and timing 352 * signals) feeding it is still running when this callback is called. 353 * 354 * The @atomic_disable callback is optional. 355 */ 356 void (*atomic_disable)(struct drm_bridge *bridge, 357 struct drm_atomic_state *state); 358 359 /** 360 * @atomic_post_disable: 361 * 362 * This callback should disable the bridge. It is called right after the 363 * preceding element in the display pipe is disabled. If the preceding 364 * element is a bridge this means it's called after that bridge's 365 * @atomic_post_disable or @post_disable function. If the preceding 366 * element is a &drm_encoder it's called right after the encoder's 367 * &drm_encoder_helper_funcs.atomic_disable hook. 368 * 369 * The bridge must assume that the display pipe (i.e. clocks and timing 370 * signals) feeding it is no longer running when this callback is 371 * called. 372 * 373 * The @atomic_post_disable callback is optional. 374 */ 375 void (*atomic_post_disable)(struct drm_bridge *bridge, 376 struct drm_atomic_state *state); 377 378 /** 379 * @atomic_duplicate_state: 380 * 381 * Duplicate the current bridge state object (which is guaranteed to be 382 * non-NULL). 383 * 384 * The atomic_duplicate_state hook is mandatory if the bridge 385 * implements any of the atomic hooks, and should be left unassigned 386 * otherwise. For bridges that don't subclass &drm_bridge_state, the 387 * drm_atomic_helper_bridge_duplicate_state() helper function shall be 388 * used to implement this hook. 389 * 390 * RETURNS: 391 * A valid drm_bridge_state object or NULL if the allocation fails. 392 */ 393 struct drm_bridge_state *(*atomic_duplicate_state)(struct drm_bridge *bridge); 394 395 /** 396 * @atomic_destroy_state: 397 * 398 * Destroy a bridge state object previously allocated by 399 * &drm_bridge_funcs.atomic_duplicate_state(). 400 * 401 * The atomic_destroy_state hook is mandatory if the bridge implements 402 * any of the atomic hooks, and should be left unassigned otherwise. 403 * For bridges that don't subclass &drm_bridge_state, the 404 * drm_atomic_helper_bridge_destroy_state() helper function shall be 405 * used to implement this hook. 406 */ 407 void (*atomic_destroy_state)(struct drm_bridge *bridge, 408 struct drm_bridge_state *state); 409 410 /** 411 * @atomic_get_output_bus_fmts: 412 * 413 * Return the supported bus formats on the output end of a bridge. 414 * The returned array must be allocated with kmalloc() and will be 415 * freed by the caller. If the allocation fails, NULL should be 416 * returned. num_output_fmts must be set to the returned array size. 417 * Formats listed in the returned array should be listed in decreasing 418 * preference order (the core will try all formats until it finds one 419 * that works). 420 * 421 * This method is only called on the last element of the bridge chain 422 * as part of the bus format negotiation process that happens in 423 * &drm_atomic_bridge_chain_select_bus_fmts(). 424 * This method is optional. When not implemented, the core will 425 * fall back to &drm_connector.display_info.bus_formats[0] if 426 * &drm_connector.display_info.num_bus_formats > 0, 427 * or to MEDIA_BUS_FMT_FIXED otherwise. 428 */ 429 u32 *(*atomic_get_output_bus_fmts)(struct drm_bridge *bridge, 430 struct drm_bridge_state *bridge_state, 431 struct drm_crtc_state *crtc_state, 432 struct drm_connector_state *conn_state, 433 unsigned int *num_output_fmts); 434 435 /** 436 * @atomic_get_input_bus_fmts: 437 * 438 * Return the supported bus formats on the input end of a bridge for 439 * a specific output bus format. 440 * 441 * The returned array must be allocated with kmalloc() and will be 442 * freed by the caller. If the allocation fails, NULL should be 443 * returned. num_input_fmts must be set to the returned array size. 444 * Formats listed in the returned array should be listed in decreasing 445 * preference order (the core will try all formats until it finds one 446 * that works). When the format is not supported NULL should be 447 * returned and num_input_fmts should be set to 0. 448 * 449 * This method is called on all elements of the bridge chain as part of 450 * the bus format negotiation process that happens in 451 * drm_atomic_bridge_chain_select_bus_fmts(). 452 * This method is optional. When not implemented, the core will bypass 453 * bus format negotiation on this element of the bridge without 454 * failing, and the previous element in the chain will be passed 455 * MEDIA_BUS_FMT_FIXED as its output bus format. 456 * 457 * Bridge drivers that need to support being linked to bridges that are 458 * not supporting bus format negotiation should handle the 459 * output_fmt == MEDIA_BUS_FMT_FIXED case appropriately, by selecting a 460 * sensible default value or extracting this information from somewhere 461 * else (FW property, &drm_display_mode, &drm_display_info, ...) 462 * 463 * Note: Even if input format selection on the first bridge has no 464 * impact on the negotiation process (bus format negotiation stops once 465 * we reach the first element of the chain), drivers are expected to 466 * return accurate input formats as the input format may be used to 467 * configure the CRTC output appropriately. 468 */ 469 u32 *(*atomic_get_input_bus_fmts)(struct drm_bridge *bridge, 470 struct drm_bridge_state *bridge_state, 471 struct drm_crtc_state *crtc_state, 472 struct drm_connector_state *conn_state, 473 u32 output_fmt, 474 unsigned int *num_input_fmts); 475 476 /** 477 * @atomic_check: 478 * 479 * This method is responsible for checking bridge state correctness. 480 * It can also check the state of the surrounding components in chain 481 * to make sure the whole pipeline can work properly. 482 * 483 * &drm_bridge_funcs.atomic_check() hooks are called in reverse 484 * order (from the last to the first bridge). 485 * 486 * This method is optional. &drm_bridge_funcs.mode_fixup() is not 487 * called when &drm_bridge_funcs.atomic_check() is implemented, so only 488 * one of them should be provided. 489 * 490 * If drivers need to tweak &drm_bridge_state.input_bus_cfg.flags or 491 * &drm_bridge_state.output_bus_cfg.flags it should happen in 492 * this function. By default the &drm_bridge_state.output_bus_cfg.flags 493 * field is set to the next bridge 494 * &drm_bridge_state.input_bus_cfg.flags value or 495 * &drm_connector.display_info.bus_flags if the bridge is the last 496 * element in the chain. 497 * 498 * RETURNS: 499 * zero if the check passed, a negative error code otherwise. 500 */ 501 int (*atomic_check)(struct drm_bridge *bridge, 502 struct drm_bridge_state *bridge_state, 503 struct drm_crtc_state *crtc_state, 504 struct drm_connector_state *conn_state); 505 506 /** 507 * @atomic_reset: 508 * 509 * Reset the bridge to a predefined state (or retrieve its current 510 * state) and return a &drm_bridge_state object matching this state. 511 * This function is called at attach time. 512 * 513 * The atomic_reset hook is mandatory if the bridge implements any of 514 * the atomic hooks, and should be left unassigned otherwise. For 515 * bridges that don't subclass &drm_bridge_state, the 516 * drm_atomic_helper_bridge_reset() helper function shall be used to 517 * implement this hook. 518 * 519 * Note that the atomic_reset() semantics is not exactly matching the 520 * reset() semantics found on other components (connector, plane, ...). 521 * 522 * 1. The reset operation happens when the bridge is attached, not when 523 * drm_mode_config_reset() is called 524 * 2. It's meant to be used exclusively on bridges that have been 525 * converted to the ATOMIC API 526 * 527 * RETURNS: 528 * A valid drm_bridge_state object in case of success, an ERR_PTR() 529 * giving the reason of the failure otherwise. 530 */ 531 struct drm_bridge_state *(*atomic_reset)(struct drm_bridge *bridge); 532 533 /** 534 * @detect: 535 * 536 * Check if anything is attached to the bridge output. 537 * 538 * This callback is optional, if not implemented the bridge will be 539 * considered as always having a component attached to its output. 540 * Bridges that implement this callback shall set the 541 * DRM_BRIDGE_OP_DETECT flag in their &drm_bridge->ops. 542 * 543 * RETURNS: 544 * 545 * drm_connector_status indicating the bridge output status. 546 */ 547 enum drm_connector_status (*detect)(struct drm_bridge *bridge, 548 struct drm_connector *connector); 549 550 /** 551 * @get_modes: 552 * 553 * Fill all modes currently valid for the sink into the &drm_connector 554 * with drm_mode_probed_add(). 555 * 556 * The @get_modes callback is mostly intended to support non-probeable 557 * displays such as many fixed panels. Bridges that support reading 558 * EDID shall leave @get_modes unimplemented and implement the 559 * &drm_bridge_funcs->edid_read callback instead. 560 * 561 * This callback is optional. Bridges that implement it shall set the 562 * DRM_BRIDGE_OP_MODES flag in their &drm_bridge->ops. 563 * 564 * The connector parameter shall be used for the sole purpose of 565 * filling modes, and shall not be stored internally by bridge drivers 566 * for future usage. 567 * 568 * RETURNS: 569 * 570 * The number of modes added by calling drm_mode_probed_add(). 571 */ 572 int (*get_modes)(struct drm_bridge *bridge, 573 struct drm_connector *connector); 574 575 /** 576 * @edid_read: 577 * 578 * Read the EDID data of the connected display. 579 * 580 * The @edid_read callback is the preferred way of reporting mode 581 * information for a display connected to the bridge output. Bridges 582 * that support reading EDID shall implement this callback and leave 583 * the @get_modes callback unimplemented. 584 * 585 * The caller of this operation shall first verify the output 586 * connection status and refrain from reading EDID from a disconnected 587 * output. 588 * 589 * This callback is optional. Bridges that implement it shall set the 590 * DRM_BRIDGE_OP_EDID flag in their &drm_bridge->ops. 591 * 592 * The connector parameter shall be used for the sole purpose of EDID 593 * retrieval, and shall not be stored internally by bridge drivers for 594 * future usage. 595 * 596 * RETURNS: 597 * 598 * An edid structure newly allocated with drm_edid_alloc() or returned 599 * from drm_edid_read() family of functions on success, or NULL 600 * otherwise. The caller is responsible for freeing the returned edid 601 * structure with drm_edid_free(). 602 */ 603 const struct drm_edid *(*edid_read)(struct drm_bridge *bridge, 604 struct drm_connector *connector); 605 606 /** 607 * @hpd_notify: 608 * 609 * Notify the bridge of hot plug detection. 610 * 611 * This callback is optional, it may be implemented by bridges that 612 * need to be notified of display connection or disconnection for 613 * internal reasons. One use case is to reset the internal state of CEC 614 * controllers for HDMI bridges. 615 */ 616 void (*hpd_notify)(struct drm_bridge *bridge, 617 enum drm_connector_status status); 618 619 /** 620 * @hpd_enable: 621 * 622 * Enable hot plug detection. From now on the bridge shall call 623 * drm_bridge_hpd_notify() each time a change is detected in the output 624 * connection status, until hot plug detection gets disabled with 625 * @hpd_disable. 626 * 627 * This callback is optional and shall only be implemented by bridges 628 * that support hot-plug notification without polling. Bridges that 629 * implement it shall also implement the @hpd_disable callback and set 630 * the DRM_BRIDGE_OP_HPD flag in their &drm_bridge->ops. 631 */ 632 void (*hpd_enable)(struct drm_bridge *bridge); 633 634 /** 635 * @hpd_disable: 636 * 637 * Disable hot plug detection. Once this function returns the bridge 638 * shall not call drm_bridge_hpd_notify() when a change in the output 639 * connection status occurs. 640 * 641 * This callback is optional and shall only be implemented by bridges 642 * that support hot-plug notification without polling. Bridges that 643 * implement it shall also implement the @hpd_enable callback and set 644 * the DRM_BRIDGE_OP_HPD flag in their &drm_bridge->ops. 645 */ 646 void (*hpd_disable)(struct drm_bridge *bridge); 647 648 /** 649 * @hdmi_tmds_char_rate_valid: 650 * 651 * Check whether a particular TMDS character rate is supported by the 652 * driver. 653 * 654 * This callback is optional and should only be implemented by the 655 * bridges that take part in the HDMI connector implementation. Bridges 656 * that implement it shall set the DRM_BRIDGE_OP_HDMI flag in their 657 * &drm_bridge->ops. 658 * 659 * Returns: 660 * 661 * Either &drm_mode_status.MODE_OK or one of the failure reasons 662 * in &enum drm_mode_status. 663 */ 664 enum drm_mode_status 665 (*hdmi_tmds_char_rate_valid)(const struct drm_bridge *bridge, 666 const struct drm_display_mode *mode, 667 unsigned long long tmds_rate); 668 669 /** 670 * @hdmi_clear_infoframe: 671 * 672 * This callback clears the infoframes in the hardware during commit. 673 * It will be called multiple times, once for every disabled infoframe 674 * type. 675 * 676 * This callback is optional but it must be implemented by bridges that 677 * set the DRM_BRIDGE_OP_HDMI flag in their &drm_bridge->ops. 678 */ 679 int (*hdmi_clear_infoframe)(struct drm_bridge *bridge, 680 enum hdmi_infoframe_type type); 681 /** 682 * @hdmi_write_infoframe: 683 * 684 * Program the infoframe into the hardware. It will be called multiple 685 * times, once for every updated infoframe type. 686 * 687 * This callback is optional but it must be implemented by bridges that 688 * set the DRM_BRIDGE_OP_HDMI flag in their &drm_bridge->ops. 689 */ 690 int (*hdmi_write_infoframe)(struct drm_bridge *bridge, 691 enum hdmi_infoframe_type type, 692 const u8 *buffer, size_t len); 693 694 /** 695 * @hdmi_audio_startup: 696 * 697 * Called when ASoC starts an audio stream setup. 698 * 699 * This callback is optional, it can be implemented by bridges that 700 * set the @DRM_BRIDGE_OP_HDMI_AUDIO flag in their &drm_bridge->ops. 701 * 702 * Returns: 703 * 0 on success, a negative error code otherwise 704 */ 705 int (*hdmi_audio_startup)(struct drm_bridge *bridge, 706 struct drm_connector *connector); 707 708 /** 709 * @hdmi_audio_prepare: 710 * Configures HDMI-encoder for audio stream. Can be called multiple 711 * times for each setup. 712 * 713 * This callback is optional but it must be implemented by bridges that 714 * set the @DRM_BRIDGE_OP_HDMI_AUDIO flag in their &drm_bridge->ops. 715 * 716 * Returns: 717 * 0 on success, a negative error code otherwise 718 */ 719 int (*hdmi_audio_prepare)(struct drm_bridge *bridge, 720 struct drm_connector *connector, 721 struct hdmi_codec_daifmt *fmt, 722 struct hdmi_codec_params *hparms); 723 724 /** 725 * @hdmi_audio_shutdown: 726 * 727 * Shut down the audio stream. 728 * 729 * This callback is optional but it must be implemented by bridges that 730 * set the @DRM_BRIDGE_OP_HDMI_AUDIO flag in their &drm_bridge->ops. 731 * 732 * Returns: 733 * 0 on success, a negative error code otherwise 734 */ 735 void (*hdmi_audio_shutdown)(struct drm_bridge *bridge, 736 struct drm_connector *connector); 737 738 /** 739 * @hdmi_audio_mute_stream: 740 * 741 * Mute/unmute HDMI audio stream. 742 * 743 * This callback is optional, it can be implemented by bridges that 744 * set the @DRM_BRIDGE_OP_HDMI_AUDIO flag in their &drm_bridge->ops. 745 * 746 * Returns: 747 * 0 on success, a negative error code otherwise 748 */ 749 int (*hdmi_audio_mute_stream)(struct drm_bridge *bridge, 750 struct drm_connector *connector, 751 bool enable, int direction); 752 753 /** 754 * @hdmi_cec_init: 755 * 756 * Initialize CEC part of the bridge. 757 * 758 * This callback is optional, it can be implemented by bridges that 759 * set the @DRM_BRIDGE_OP_HDMI_CEC_ADAPTER flag in their 760 * &drm_bridge->ops. 761 * 762 * Returns: 763 * 0 on success, a negative error code otherwise 764 */ 765 int (*hdmi_cec_init)(struct drm_bridge *bridge, 766 struct drm_connector *connector); 767 768 /** 769 * @hdmi_cec_enable: 770 * 771 * Enable or disable the CEC adapter inside the bridge. 772 * 773 * This callback is optional, it can be implemented by bridges that 774 * set the @DRM_BRIDGE_OP_HDMI_CEC_ADAPTER flag in their 775 * &drm_bridge->ops. 776 * 777 * Returns: 778 * 0 on success, a negative error code otherwise 779 */ 780 int (*hdmi_cec_enable)(struct drm_bridge *bridge, bool enable); 781 782 /** 783 * @hdmi_cec_log_addr: 784 * 785 * Set the logical address of the CEC adapter inside the bridge. 786 * 787 * This callback is optional, it can be implemented by bridges that 788 * set the @DRM_BRIDGE_OP_HDMI_CEC_ADAPTER flag in their 789 * &drm_bridge->ops. 790 * 791 * Returns: 792 * 0 on success, a negative error code otherwise 793 */ 794 int (*hdmi_cec_log_addr)(struct drm_bridge *bridge, u8 logical_addr); 795 796 /** 797 * @hdmi_cec_transmit: 798 * 799 * Transmit the message using the CEC adapter inside the bridge. 800 * 801 * This callback is optional, it can be implemented by bridges that 802 * set the @DRM_BRIDGE_OP_HDMI_CEC_ADAPTER flag in their 803 * &drm_bridge->ops. 804 * 805 * Returns: 806 * 0 on success, a negative error code otherwise 807 */ 808 int (*hdmi_cec_transmit)(struct drm_bridge *bridge, u8 attempts, 809 u32 signal_free_time, struct cec_msg *msg); 810 811 /** 812 * @dp_audio_startup: 813 * 814 * Called when ASoC starts a DisplayPort audio stream setup. 815 * 816 * This callback is optional, it can be implemented by bridges that 817 * set the @DRM_BRIDGE_OP_DP_AUDIO flag in their &drm_bridge->ops. 818 * 819 * Returns: 820 * 0 on success, a negative error code otherwise 821 */ 822 int (*dp_audio_startup)(struct drm_bridge *bridge, 823 struct drm_connector *connector); 824 825 /** 826 * @dp_audio_prepare: 827 * Configures DisplayPort audio stream. Can be called multiple 828 * times for each setup. 829 * 830 * This callback is optional but it must be implemented by bridges that 831 * set the @DRM_BRIDGE_OP_DP_AUDIO flag in their &drm_bridge->ops. 832 * 833 * Returns: 834 * 0 on success, a negative error code otherwise 835 */ 836 int (*dp_audio_prepare)(struct drm_bridge *bridge, 837 struct drm_connector *connector, 838 struct hdmi_codec_daifmt *fmt, 839 struct hdmi_codec_params *hparms); 840 841 /** 842 * @dp_audio_shutdown: 843 * 844 * Shut down the DisplayPort audio stream. 845 * 846 * This callback is optional but it must be implemented by bridges that 847 * set the @DRM_BRIDGE_OP_DP_AUDIO flag in their &drm_bridge->ops. 848 * 849 * Returns: 850 * 0 on success, a negative error code otherwise 851 */ 852 void (*dp_audio_shutdown)(struct drm_bridge *bridge, 853 struct drm_connector *connector); 854 855 /** 856 * @dp_audio_mute_stream: 857 * 858 * Mute/unmute DisplayPort audio stream. 859 * 860 * This callback is optional, it can be implemented by bridges that 861 * set the @DRM_BRIDGE_OP_DP_AUDIO flag in their &drm_bridge->ops. 862 * 863 * Returns: 864 * 0 on success, a negative error code otherwise 865 */ 866 int (*dp_audio_mute_stream)(struct drm_bridge *bridge, 867 struct drm_connector *connector, 868 bool enable, int direction); 869 870 /** 871 * @debugfs_init: 872 * 873 * Allows bridges to create bridge-specific debugfs files. 874 */ 875 void (*debugfs_init)(struct drm_bridge *bridge, struct dentry *root); 876}; 877 878/** 879 * struct drm_bridge_timings - timing information for the bridge 880 */ 881struct drm_bridge_timings { 882 /** 883 * @input_bus_flags: 884 * 885 * Tells what additional settings for the pixel data on the bus 886 * this bridge requires (like pixel signal polarity). See also 887 * &drm_display_info->bus_flags. 888 */ 889 u32 input_bus_flags; 890 /** 891 * @setup_time_ps: 892 * 893 * Defines the time in picoseconds the input data lines must be 894 * stable before the clock edge. 895 */ 896 u32 setup_time_ps; 897 /** 898 * @hold_time_ps: 899 * 900 * Defines the time in picoseconds taken for the bridge to sample the 901 * input signal after the clock edge. 902 */ 903 u32 hold_time_ps; 904 /** 905 * @dual_link: 906 * 907 * True if the bus operates in dual-link mode. The exact meaning is 908 * dependent on the bus type. For LVDS buses, this indicates that even- 909 * and odd-numbered pixels are received on separate links. 910 */ 911 bool dual_link; 912}; 913 914/** 915 * enum drm_bridge_ops - Bitmask of operations supported by the bridge 916 */ 917enum drm_bridge_ops { 918 /** 919 * @DRM_BRIDGE_OP_DETECT: The bridge can detect displays connected to 920 * its output. Bridges that set this flag shall implement the 921 * &drm_bridge_funcs->detect callback. 922 */ 923 DRM_BRIDGE_OP_DETECT = BIT(0), 924 /** 925 * @DRM_BRIDGE_OP_EDID: The bridge can retrieve the EDID of the display 926 * connected to its output. Bridges that set this flag shall implement 927 * the &drm_bridge_funcs->edid_read callback. 928 */ 929 DRM_BRIDGE_OP_EDID = BIT(1), 930 /** 931 * @DRM_BRIDGE_OP_HPD: The bridge can detect hot-plug and hot-unplug 932 * without requiring polling. Bridges that set this flag shall 933 * implement the &drm_bridge_funcs->hpd_enable and 934 * &drm_bridge_funcs->hpd_disable callbacks if they support enabling 935 * and disabling hot-plug detection dynamically. 936 */ 937 DRM_BRIDGE_OP_HPD = BIT(2), 938 /** 939 * @DRM_BRIDGE_OP_MODES: The bridge can retrieve the modes supported 940 * by the display at its output. This does not include reading EDID 941 * which is separately covered by @DRM_BRIDGE_OP_EDID. Bridges that set 942 * this flag shall implement the &drm_bridge_funcs->get_modes callback. 943 */ 944 DRM_BRIDGE_OP_MODES = BIT(3), 945 /** 946 * @DRM_BRIDGE_OP_HDMI: The bridge provides HDMI connector operations, 947 * including infoframes support. Bridges that set this flag must 948 * implement the &drm_bridge_funcs->write_infoframe callback. 949 * 950 * Note: currently there can be at most one bridge in a chain that sets 951 * this bit. This is to simplify corresponding glue code in connector 952 * drivers. 953 */ 954 DRM_BRIDGE_OP_HDMI = BIT(4), 955 /** 956 * @DRM_BRIDGE_OP_HDMI_AUDIO: The bridge provides HDMI audio operations. 957 * Bridges that set this flag must implement the 958 * &drm_bridge_funcs->hdmi_audio_prepare and 959 * &drm_bridge_funcs->hdmi_audio_shutdown callbacks. 960 * 961 * Note: currently there can be at most one bridge in a chain that sets 962 * this bit. This is to simplify corresponding glue code in connector 963 * drivers. Also it is not possible to have a bridge in the chain that 964 * sets @DRM_BRIDGE_OP_DP_AUDIO if there is a bridge that sets this 965 * flag. 966 */ 967 DRM_BRIDGE_OP_HDMI_AUDIO = BIT(5), 968 /** 969 * @DRM_BRIDGE_OP_DP_AUDIO: The bridge provides DisplayPort audio operations. 970 * Bridges that set this flag must implement the 971 * &drm_bridge_funcs->dp_audio_prepare and 972 * &drm_bridge_funcs->dp_audio_shutdown callbacks. 973 * 974 * Note: currently there can be at most one bridge in a chain that sets 975 * this bit. This is to simplify corresponding glue code in connector 976 * drivers. Also it is not possible to have a bridge in the chain that 977 * sets @DRM_BRIDGE_OP_HDMI_AUDIO if there is a bridge that sets this 978 * flag. 979 */ 980 DRM_BRIDGE_OP_DP_AUDIO = BIT(6), 981 /** 982 * @DRM_BRIDGE_OP_HDMI_CEC_NOTIFIER: The bridge requires CEC notifier 983 * to be present. 984 */ 985 DRM_BRIDGE_OP_HDMI_CEC_NOTIFIER = BIT(7), 986 /** 987 * @DRM_BRIDGE_OP_HDMI_CEC_ADAPTER: The bridge requires CEC adapter 988 * to be present. 989 */ 990 DRM_BRIDGE_OP_HDMI_CEC_ADAPTER = BIT(8), 991}; 992 993/** 994 * struct drm_bridge - central DRM bridge control structure 995 */ 996struct drm_bridge { 997 /** @base: inherit from &drm_private_object */ 998 struct drm_private_obj base; 999 /** @dev: DRM device this bridge belongs to */ 1000 struct drm_device *dev; 1001 /** @encoder: encoder to which this bridge is connected */ 1002 struct drm_encoder *encoder; 1003 /** @chain_node: used to form a bridge chain */ 1004 struct list_head chain_node; 1005 /** @of_node: device node pointer to the bridge */ 1006 struct device_node *of_node; 1007 /** @list: to keep track of all added bridges */ 1008 struct list_head list; 1009 /** 1010 * @timings: 1011 * 1012 * the timing specification for the bridge, if any (may be NULL) 1013 */ 1014 const struct drm_bridge_timings *timings; 1015 /** @funcs: control functions */ 1016 const struct drm_bridge_funcs *funcs; 1017 1018 /** 1019 * @container: Pointer to the private driver struct embedding this 1020 * @struct drm_bridge. 1021 */ 1022 void *container; 1023 1024 /** 1025 * @refcount: reference count of users referencing this bridge. 1026 */ 1027 struct kref refcount; 1028 1029 /** @driver_private: pointer to the bridge driver's internal context */ 1030 void *driver_private; 1031 /** @ops: bitmask of operations supported by the bridge */ 1032 enum drm_bridge_ops ops; 1033 /** 1034 * @type: Type of the connection at the bridge output 1035 * (DRM_MODE_CONNECTOR_*). For bridges at the end of this chain this 1036 * identifies the type of connected display. 1037 */ 1038 int type; 1039 /** 1040 * @interlace_allowed: Indicate that the bridge can handle interlaced 1041 * modes. 1042 */ 1043 bool interlace_allowed; 1044 /** 1045 * @ycbcr_420_allowed: Indicate that the bridge can handle YCbCr 420 1046 * output. 1047 */ 1048 bool ycbcr_420_allowed; 1049 /** 1050 * @pre_enable_prev_first: The bridge requires that the prev 1051 * bridge @pre_enable function is called before its @pre_enable, 1052 * and conversely for post_disable. This is most frequently a 1053 * requirement for DSI devices which need the host to be initialised 1054 * before the peripheral. 1055 */ 1056 bool pre_enable_prev_first; 1057 /** 1058 * @support_hdcp: Indicate that the bridge supports HDCP. 1059 */ 1060 bool support_hdcp; 1061 /** 1062 * @ddc: Associated I2C adapter for DDC access, if any. 1063 */ 1064 struct i2c_adapter *ddc; 1065 1066 /** 1067 * @vendor: Vendor of the product to be used for the SPD InfoFrame 1068 * generation. This is required if @DRM_BRIDGE_OP_HDMI is set. 1069 */ 1070 const char *vendor; 1071 1072 /** 1073 * @product: Name of the product to be used for the SPD InfoFrame 1074 * generation. This is required if @DRM_BRIDGE_OP_HDMI is set. 1075 */ 1076 const char *product; 1077 1078 /** 1079 * @supported_formats: Bitmask of @hdmi_colorspace listing supported 1080 * output formats. This is only relevant if @DRM_BRIDGE_OP_HDMI is set. 1081 */ 1082 unsigned int supported_formats; 1083 1084 /** 1085 * @max_bpc: Maximum bits per char the HDMI bridge supports. Allowed 1086 * values are 8, 10 and 12. This is only relevant if 1087 * @DRM_BRIDGE_OP_HDMI is set. 1088 */ 1089 unsigned int max_bpc; 1090 1091 /** 1092 * @hdmi_cec_dev: device to be used as a containing device for CEC 1093 * functions. 1094 */ 1095 struct device *hdmi_cec_dev; 1096 1097 /** 1098 * @hdmi_audio_dev: device to be used as a parent for the HDMI Codec if 1099 * either of @DRM_BRIDGE_OP_HDMI_AUDIO or @DRM_BRIDGE_OP_DP_AUDIO is set. 1100 */ 1101 struct device *hdmi_audio_dev; 1102 1103 /** 1104 * @hdmi_audio_max_i2s_playback_channels: maximum number of playback 1105 * I2S channels for the @DRM_BRIDGE_OP_HDMI_AUDIO or 1106 * @DRM_BRIDGE_OP_DP_AUDIO. 1107 */ 1108 int hdmi_audio_max_i2s_playback_channels; 1109 1110 /** 1111 * @hdmi_audio_i2s_formats: supported I2S formats, optional. The 1112 * default is to allow all formats supported by the corresponding I2S 1113 * bus driver. This is only used for bridges setting 1114 * @DRM_BRIDGE_OP_HDMI_AUDIO or @DRM_BRIDGE_OP_DP_AUDIO. 1115 */ 1116 u64 hdmi_audio_i2s_formats; 1117 1118 /** 1119 * @hdmi_audio_spdif_playback: set if this bridge has S/PDIF playback 1120 * port for @DRM_BRIDGE_OP_HDMI_AUDIO or @DRM_BRIDGE_OP_DP_AUDIO. 1121 */ 1122 unsigned int hdmi_audio_spdif_playback : 1; 1123 1124 /** 1125 * @hdmi_audio_dai_port: sound DAI port for either of 1126 * @DRM_BRIDGE_OP_HDMI_AUDIO and @DRM_BRIDGE_OP_DP_AUDIO, -1 if it is 1127 * not used. 1128 */ 1129 int hdmi_audio_dai_port; 1130 1131 /** 1132 * @hdmi_cec_adapter_name: the name of the adapter to register 1133 */ 1134 const char *hdmi_cec_adapter_name; 1135 1136 /** 1137 * @hdmi_cec_available_las: number of logical addresses, CEC_MAX_LOG_ADDRS if unset 1138 */ 1139 u8 hdmi_cec_available_las; 1140 1141 /** private: */ 1142 /** 1143 * @hpd_mutex: Protects the @hpd_cb and @hpd_data fields. 1144 */ 1145 struct mutex hpd_mutex; 1146 /** 1147 * @hpd_cb: Hot plug detection callback, registered with 1148 * drm_bridge_hpd_enable(). 1149 */ 1150 void (*hpd_cb)(void *data, enum drm_connector_status status); 1151 /** 1152 * @hpd_data: Private data passed to the Hot plug detection callback 1153 * @hpd_cb. 1154 */ 1155 void *hpd_data; 1156}; 1157 1158static inline struct drm_bridge * 1159drm_priv_to_bridge(struct drm_private_obj *priv) 1160{ 1161 return container_of(priv, struct drm_bridge, base); 1162} 1163 1164struct drm_bridge *drm_bridge_get(struct drm_bridge *bridge); 1165void drm_bridge_put(struct drm_bridge *bridge); 1166 1167/* Cleanup action for use with __free() */ 1168DEFINE_FREE(drm_bridge_put, struct drm_bridge *, if (_T) drm_bridge_put(_T)) 1169 1170void *__devm_drm_bridge_alloc(struct device *dev, size_t size, size_t offset, 1171 const struct drm_bridge_funcs *funcs); 1172 1173/** 1174 * devm_drm_bridge_alloc - Allocate and initialize a bridge 1175 * @dev: struct device of the bridge device 1176 * @type: the type of the struct which contains struct &drm_bridge 1177 * @member: the name of the &drm_bridge within @type 1178 * @funcs: callbacks for this bridge 1179 * 1180 * The reference count of the returned bridge is initialized to 1. This 1181 * reference will be automatically dropped via devm (by calling 1182 * drm_bridge_put()) when @dev is removed. 1183 * 1184 * Returns: 1185 * Pointer to new bridge, or ERR_PTR on failure. 1186 */ 1187#define devm_drm_bridge_alloc(dev, type, member, funcs) \ 1188 ((type *)__devm_drm_bridge_alloc(dev, sizeof(type), \ 1189 offsetof(type, member), funcs)) 1190 1191void drm_bridge_add(struct drm_bridge *bridge); 1192int devm_drm_bridge_add(struct device *dev, struct drm_bridge *bridge); 1193void drm_bridge_remove(struct drm_bridge *bridge); 1194int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge, 1195 struct drm_bridge *previous, 1196 enum drm_bridge_attach_flags flags); 1197 1198#ifdef CONFIG_OF 1199struct drm_bridge *of_drm_find_bridge(struct device_node *np); 1200#else 1201static inline struct drm_bridge *of_drm_find_bridge(struct device_node *np) 1202{ 1203 return NULL; 1204} 1205#endif 1206 1207static inline bool drm_bridge_is_last(struct drm_bridge *bridge) 1208{ 1209 return list_is_last(&bridge->chain_node, &bridge->encoder->bridge_chain); 1210} 1211 1212/** 1213 * drm_bridge_get_current_state() - Get the current bridge state 1214 * @bridge: bridge object 1215 * 1216 * This function must be called with the modeset lock held. 1217 * 1218 * RETURNS: 1219 * 1220 * The current bridge state, or NULL if there is none. 1221 */ 1222static inline struct drm_bridge_state * 1223drm_bridge_get_current_state(struct drm_bridge *bridge) 1224{ 1225 if (!bridge) 1226 return NULL; 1227 1228 /* 1229 * Only atomic bridges will have bridge->base initialized by 1230 * drm_atomic_private_obj_init(), so we need to make sure we're 1231 * working with one before we try to use the lock. 1232 */ 1233 if (!bridge->funcs || !bridge->funcs->atomic_reset) 1234 return NULL; 1235 1236 drm_modeset_lock_assert_held(&bridge->base.lock); 1237 1238 if (!bridge->base.state) 1239 return NULL; 1240 1241 return drm_priv_to_bridge_state(bridge->base.state); 1242} 1243 1244/** 1245 * drm_bridge_get_next_bridge() - Get the next bridge in the chain 1246 * @bridge: bridge object 1247 * 1248 * The caller is responsible of having a reference to @bridge via 1249 * drm_bridge_get() or equivalent. This function leaves the refcount of 1250 * @bridge unmodified. 1251 * 1252 * The refcount of the returned bridge is incremented. Use drm_bridge_put() 1253 * when done with it. 1254 * 1255 * RETURNS: 1256 * the next bridge in the chain after @bridge, or NULL if @bridge is the last. 1257 */ 1258static inline struct drm_bridge * 1259drm_bridge_get_next_bridge(struct drm_bridge *bridge) 1260{ 1261 if (list_is_last(&bridge->chain_node, &bridge->encoder->bridge_chain)) 1262 return NULL; 1263 1264 return drm_bridge_get(list_next_entry(bridge, chain_node)); 1265} 1266 1267/** 1268 * drm_bridge_get_prev_bridge() - Get the previous bridge in the chain 1269 * @bridge: bridge object 1270 * 1271 * The caller is responsible of having a reference to @bridge via 1272 * drm_bridge_get() or equivalent. This function leaves the refcount of 1273 * @bridge unmodified. 1274 * 1275 * The refcount of the returned bridge is incremented. Use drm_bridge_put() 1276 * when done with it. 1277 * 1278 * RETURNS: 1279 * the previous bridge in the chain, or NULL if @bridge is the first. 1280 */ 1281static inline struct drm_bridge * 1282drm_bridge_get_prev_bridge(struct drm_bridge *bridge) 1283{ 1284 if (list_is_first(&bridge->chain_node, &bridge->encoder->bridge_chain)) 1285 return NULL; 1286 1287 return drm_bridge_get(list_prev_entry(bridge, chain_node)); 1288} 1289 1290/** 1291 * drm_bridge_chain_get_first_bridge() - Get the first bridge in the chain 1292 * @encoder: encoder object 1293 * 1294 * The refcount of the returned bridge is incremented. Use drm_bridge_put() 1295 * when done with it. 1296 * 1297 * RETURNS: 1298 * the first bridge in the chain, or NULL if @encoder has no bridge attached 1299 * to it. 1300 */ 1301static inline struct drm_bridge * 1302drm_bridge_chain_get_first_bridge(struct drm_encoder *encoder) 1303{ 1304 return drm_bridge_get(list_first_entry_or_null(&encoder->bridge_chain, 1305 struct drm_bridge, chain_node)); 1306} 1307 1308/** 1309 * drm_bridge_chain_get_last_bridge() - Get the last bridge in the chain 1310 * @encoder: encoder object 1311 * 1312 * The refcount of the returned bridge is incremented. Use drm_bridge_put() 1313 * when done with it. 1314 * 1315 * RETURNS: 1316 * the last bridge in the chain, or NULL if @encoder has no bridge attached 1317 * to it. 1318 */ 1319static inline struct drm_bridge * 1320drm_bridge_chain_get_last_bridge(struct drm_encoder *encoder) 1321{ 1322 return drm_bridge_get(list_last_entry_or_null(&encoder->bridge_chain, 1323 struct drm_bridge, chain_node)); 1324} 1325 1326/** 1327 * drm_bridge_get_next_bridge_and_put - Get the next bridge in the chain 1328 * and put the previous 1329 * @bridge: bridge object 1330 * 1331 * Same as drm_bridge_get_next_bridge() but additionally puts the @bridge. 1332 * 1333 * RETURNS: 1334 * the next bridge in the chain after @bridge, or NULL if @bridge is the last. 1335 */ 1336static inline struct drm_bridge * 1337drm_bridge_get_next_bridge_and_put(struct drm_bridge *bridge) 1338{ 1339 struct drm_bridge *next = drm_bridge_get_next_bridge(bridge); 1340 1341 drm_bridge_put(bridge); 1342 1343 return next; 1344} 1345 1346/** 1347 * drm_for_each_bridge_in_chain_scoped - iterate over all bridges attached 1348 * to an encoder 1349 * @encoder: the encoder to iterate bridges on 1350 * @bridge: a bridge pointer updated to point to the current bridge at each 1351 * iteration 1352 * 1353 * Iterate over all bridges present in the bridge chain attached to @encoder. 1354 * 1355 * Automatically gets/puts the bridge reference while iterating, and puts 1356 * the reference even if returning or breaking in the middle of the loop. 1357 */ 1358#define drm_for_each_bridge_in_chain_scoped(encoder, bridge) \ 1359 for (struct drm_bridge *bridge __free(drm_bridge_put) = \ 1360 drm_bridge_chain_get_first_bridge(encoder); \ 1361 bridge; \ 1362 bridge = drm_bridge_get_next_bridge_and_put(bridge)) 1363 1364/** 1365 * drm_for_each_bridge_in_chain_from - iterate over all bridges starting 1366 * from the given bridge 1367 * @first_bridge: the bridge to start from 1368 * @bridge: a bridge pointer updated to point to the current bridge at each 1369 * iteration 1370 * 1371 * Iterate over all bridges in the encoder chain starting from 1372 * @first_bridge, included. 1373 * 1374 * Automatically gets/puts the bridge reference while iterating, and puts 1375 * the reference even if returning or breaking in the middle of the loop. 1376 */ 1377#define drm_for_each_bridge_in_chain_from(first_bridge, bridge) \ 1378 for (struct drm_bridge *bridge __free(drm_bridge_put) = \ 1379 drm_bridge_get(first_bridge); \ 1380 bridge; \ 1381 bridge = drm_bridge_get_next_bridge_and_put(bridge)) 1382 1383enum drm_mode_status 1384drm_bridge_chain_mode_valid(struct drm_bridge *bridge, 1385 const struct drm_display_info *info, 1386 const struct drm_display_mode *mode); 1387void drm_bridge_chain_mode_set(struct drm_bridge *bridge, 1388 const struct drm_display_mode *mode, 1389 const struct drm_display_mode *adjusted_mode); 1390 1391int drm_atomic_bridge_chain_check(struct drm_bridge *bridge, 1392 struct drm_crtc_state *crtc_state, 1393 struct drm_connector_state *conn_state); 1394void drm_atomic_bridge_chain_disable(struct drm_bridge *bridge, 1395 struct drm_atomic_state *state); 1396void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge, 1397 struct drm_atomic_state *state); 1398void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge, 1399 struct drm_atomic_state *state); 1400void drm_atomic_bridge_chain_enable(struct drm_bridge *bridge, 1401 struct drm_atomic_state *state); 1402 1403u32 * 1404drm_atomic_helper_bridge_propagate_bus_fmt(struct drm_bridge *bridge, 1405 struct drm_bridge_state *bridge_state, 1406 struct drm_crtc_state *crtc_state, 1407 struct drm_connector_state *conn_state, 1408 u32 output_fmt, 1409 unsigned int *num_input_fmts); 1410 1411enum drm_connector_status 1412drm_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connector); 1413int drm_bridge_get_modes(struct drm_bridge *bridge, 1414 struct drm_connector *connector); 1415const struct drm_edid *drm_bridge_edid_read(struct drm_bridge *bridge, 1416 struct drm_connector *connector); 1417void drm_bridge_hpd_enable(struct drm_bridge *bridge, 1418 void (*cb)(void *data, 1419 enum drm_connector_status status), 1420 void *data); 1421void drm_bridge_hpd_disable(struct drm_bridge *bridge); 1422void drm_bridge_hpd_notify(struct drm_bridge *bridge, 1423 enum drm_connector_status status); 1424 1425#ifdef CONFIG_DRM_PANEL_BRIDGE 1426bool drm_bridge_is_panel(const struct drm_bridge *bridge); 1427struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel); 1428struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel, 1429 u32 connector_type); 1430void drm_panel_bridge_remove(struct drm_bridge *bridge); 1431int drm_panel_bridge_set_orientation(struct drm_connector *connector, 1432 struct drm_bridge *bridge); 1433struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev, 1434 struct drm_panel *panel); 1435struct drm_bridge *devm_drm_panel_bridge_add_typed(struct device *dev, 1436 struct drm_panel *panel, 1437 u32 connector_type); 1438struct drm_bridge *drmm_panel_bridge_add(struct drm_device *drm, 1439 struct drm_panel *panel); 1440struct drm_connector *drm_panel_bridge_connector(struct drm_bridge *bridge); 1441#else 1442static inline bool drm_bridge_is_panel(const struct drm_bridge *bridge) 1443{ 1444 return false; 1445} 1446 1447static inline int drm_panel_bridge_set_orientation(struct drm_connector *connector, 1448 struct drm_bridge *bridge) 1449{ 1450 return -EINVAL; 1451} 1452#endif 1453 1454#if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL_BRIDGE) 1455struct drm_bridge *devm_drm_of_get_bridge(struct device *dev, struct device_node *node, 1456 u32 port, u32 endpoint); 1457struct drm_bridge *drmm_of_get_bridge(struct drm_device *drm, struct device_node *node, 1458 u32 port, u32 endpoint); 1459#else 1460static inline struct drm_bridge *devm_drm_of_get_bridge(struct device *dev, 1461 struct device_node *node, 1462 u32 port, 1463 u32 endpoint) 1464{ 1465 return ERR_PTR(-ENODEV); 1466} 1467 1468static inline struct drm_bridge *drmm_of_get_bridge(struct drm_device *drm, 1469 struct device_node *node, 1470 u32 port, 1471 u32 endpoint) 1472{ 1473 return ERR_PTR(-ENODEV); 1474} 1475#endif 1476 1477void devm_drm_put_bridge(struct device *dev, struct drm_bridge *bridge); 1478 1479void drm_bridge_debugfs_params(struct dentry *root); 1480void drm_bridge_debugfs_encoder_params(struct dentry *root, struct drm_encoder *encoder); 1481 1482#endif
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