1 /* $NetBSD: drm_dp_mst_helper.h,v 1.7 2021/12/18 23:45:45 riastradh Exp $ */ 2 3 /* 4 * Copyright 2014 Red Hat. 5 * 6 * Permission to use, copy, modify, distribute, and sell this software and its 7 * documentation for any purpose is hereby granted without fee, provided that 8 * the above copyright notice appear in all copies and that both that copyright 9 * notice and this permission notice appear in supporting documentation, and 10 * that the name of the copyright holders not be used in advertising or 11 * publicity pertaining to distribution of the software without specific, 12 * written prior permission. The copyright holders make no representations 13 * about the suitability of this software for any purpose. It is provided "as 14 * is" without express or implied warranty. 15 * 16 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 17 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 18 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 19 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 20 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 21 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 22 * OF THIS SOFTWARE. 23 */ 24 #ifndef _DRM_DP_MST_HELPER_H_ 25 #define _DRM_DP_MST_HELPER_H_ 26 27 #include <linux/kref.h> 28 #include <linux/list.h> 29 #include <linux/mutex.h> 30 #include <linux/types.h> 31 #include <linux/workqueue.h> 32 #include <drm/drm_dp_helper.h> 33 #include <drm/drm_atomic.h> 34 35 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) 36 #include <linux/stackdepot.h> 37 #include <linux/timekeeping.h> 38 39 enum drm_dp_mst_topology_ref_type { 40 DRM_DP_MST_TOPOLOGY_REF_GET, 41 DRM_DP_MST_TOPOLOGY_REF_PUT, 42 }; 43 44 struct drm_dp_mst_topology_ref_history { 45 struct drm_dp_mst_topology_ref_entry { 46 enum drm_dp_mst_topology_ref_type type; 47 int count; 48 ktime_t ts_nsec; 49 depot_stack_handle_t backtrace; 50 } *entries; 51 int len; 52 }; 53 #endif /* IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) */ 54 55 struct drm_dp_mst_branch; 56 57 /** 58 * struct drm_dp_vcpi - Virtual Channel Payload Identifier 59 * @vcpi: Virtual channel ID. 60 * @pbn: Payload Bandwidth Number for this channel 61 * @aligned_pbn: PBN aligned with slot size 62 * @num_slots: number of slots for this PBN 63 */ 64 struct drm_dp_vcpi { 65 int vcpi; 66 int pbn; 67 int aligned_pbn; 68 int num_slots; 69 }; 70 71 /** 72 * struct drm_dp_mst_port - MST port 73 * @port_num: port number 74 * @input: if this port is an input port. Protected by 75 * &drm_dp_mst_topology_mgr.base.lock. 76 * @mcs: message capability status - DP 1.2 spec. Protected by 77 * &drm_dp_mst_topology_mgr.base.lock. 78 * @ddps: DisplayPort Device Plug Status - DP 1.2. Protected by 79 * &drm_dp_mst_topology_mgr.base.lock. 80 * @pdt: Peer Device Type. Protected by 81 * &drm_dp_mst_topology_mgr.base.lock. 82 * @ldps: Legacy Device Plug Status. Protected by 83 * &drm_dp_mst_topology_mgr.base.lock. 84 * @dpcd_rev: DPCD revision of device on this port. Protected by 85 * &drm_dp_mst_topology_mgr.base.lock. 86 * @num_sdp_streams: Number of simultaneous streams. Protected by 87 * &drm_dp_mst_topology_mgr.base.lock. 88 * @num_sdp_stream_sinks: Number of stream sinks. Protected by 89 * &drm_dp_mst_topology_mgr.base.lock. 90 * @available_pbn: Available bandwidth for this port. Protected by 91 * &drm_dp_mst_topology_mgr.base.lock. 92 * @next: link to next port on this branch device 93 * @aux: i2c aux transport to talk to device connected to this port, protected 94 * by &drm_dp_mst_topology_mgr.base.lock. 95 * @parent: branch device parent of this port 96 * @vcpi: Virtual Channel Payload info for this port. 97 * @connector: DRM connector this port is connected to. Protected by 98 * &drm_dp_mst_topology_mgr.base.lock. 99 * @mgr: topology manager this port lives under. 100 * 101 * This structure represents an MST port endpoint on a device somewhere 102 * in the MST topology. 103 */ 104 struct drm_dp_mst_port { 105 /** 106 * @topology_kref: refcount for this port's lifetime in the topology, 107 * only the DP MST helpers should need to touch this 108 */ 109 struct kref topology_kref; 110 111 /** 112 * @malloc_kref: refcount for the memory allocation containing this 113 * structure. See drm_dp_mst_get_port_malloc() and 114 * drm_dp_mst_put_port_malloc(). 115 */ 116 struct kref malloc_kref; 117 118 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) 119 /** 120 * @topology_ref_history: A history of each topology 121 * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS. 122 */ 123 struct drm_dp_mst_topology_ref_history topology_ref_history; 124 #endif 125 126 u8 port_num; 127 bool input; 128 bool mcs; 129 bool ddps; 130 u8 pdt; 131 bool ldps; 132 u8 dpcd_rev; 133 u8 num_sdp_streams; 134 u8 num_sdp_stream_sinks; 135 uint16_t available_pbn; 136 struct list_head next; 137 /** 138 * @mstb: the branch device connected to this port, if there is one. 139 * This should be considered protected for reading by 140 * &drm_dp_mst_topology_mgr.lock. There are two exceptions to this: 141 * &drm_dp_mst_topology_mgr.up_req_work and 142 * &drm_dp_mst_topology_mgr.work, which do not grab 143 * &drm_dp_mst_topology_mgr.lock during reads but are the only 144 * updaters of this list and are protected from writing concurrently 145 * by &drm_dp_mst_topology_mgr.probe_lock. 146 */ 147 struct drm_dp_mst_branch *mstb; 148 struct drm_dp_aux aux; /* i2c bus for this port? */ 149 struct drm_dp_mst_branch *parent; 150 151 struct drm_dp_vcpi vcpi; 152 struct drm_connector *connector; 153 struct drm_dp_mst_topology_mgr *mgr; 154 155 /** 156 * @cached_edid: for DP logical ports - make tiling work by ensuring 157 * that the EDID for all connectors is read immediately. 158 */ 159 struct edid *cached_edid; 160 /** 161 * @has_audio: Tracks whether the sink connector to this port is 162 * audio-capable. 163 */ 164 bool has_audio; 165 166 bool fec_capable; 167 }; 168 169 /** 170 * struct drm_dp_mst_branch - MST branch device. 171 * @rad: Relative Address to talk to this branch device. 172 * @lct: Link count total to talk to this branch device. 173 * @num_ports: number of ports on the branch. 174 * @msg_slots: one bit per transmitted msg slot. 175 * @port_parent: pointer to the port parent, NULL if toplevel. 176 * @mgr: topology manager for this branch device. 177 * @tx_slots: transmission slots for this device. 178 * @last_seqno: last sequence number used to talk to this. 179 * @link_address_sent: if a link address message has been sent to this device yet. 180 * @guid: guid for DP 1.2 branch device. port under this branch can be 181 * identified by port #. 182 * 183 * This structure represents an MST branch device, there is one 184 * primary branch device at the root, along with any other branches connected 185 * to downstream port of parent branches. 186 */ 187 struct drm_dp_mst_branch { 188 /** 189 * @topology_kref: refcount for this branch device's lifetime in the 190 * topology, only the DP MST helpers should need to touch this 191 */ 192 struct kref topology_kref; 193 194 /** 195 * @malloc_kref: refcount for the memory allocation containing this 196 * structure. See drm_dp_mst_get_mstb_malloc() and 197 * drm_dp_mst_put_mstb_malloc(). 198 */ 199 struct kref malloc_kref; 200 201 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) 202 /** 203 * @topology_ref_history: A history of each topology 204 * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS. 205 */ 206 struct drm_dp_mst_topology_ref_history topology_ref_history; 207 #endif 208 209 /** 210 * @destroy_next: linked-list entry used by 211 * drm_dp_delayed_destroy_work() 212 */ 213 struct list_head destroy_next; 214 215 u8 rad[8]; 216 u8 lct; 217 int num_ports; 218 219 int msg_slots; 220 /** 221 * @ports: the list of ports on this branch device. This should be 222 * considered protected for reading by &drm_dp_mst_topology_mgr.lock. 223 * There are two exceptions to this: 224 * &drm_dp_mst_topology_mgr.up_req_work and 225 * &drm_dp_mst_topology_mgr.work, which do not grab 226 * &drm_dp_mst_topology_mgr.lock during reads but are the only 227 * updaters of this list and are protected from updating the list 228 * concurrently by @drm_dp_mst_topology_mgr.probe_lock 229 */ 230 struct list_head ports; 231 232 /* list of tx ops queue for this port */ 233 struct drm_dp_mst_port *port_parent; 234 struct drm_dp_mst_topology_mgr *mgr; 235 236 /* slots are protected by mstb->mgr->qlock */ 237 struct drm_dp_sideband_msg_tx *tx_slots[2]; 238 int last_seqno; 239 bool link_address_sent; 240 241 /* global unique identifier to identify branch devices */ 242 u8 guid[16]; 243 }; 244 245 246 /* sideband msg header - not bit struct */ 247 struct drm_dp_sideband_msg_hdr { 248 u8 lct; 249 u8 lcr; 250 u8 rad[8]; 251 bool broadcast; 252 bool path_msg; 253 u8 msg_len; 254 bool somt; 255 bool eomt; 256 bool seqno; 257 }; 258 259 struct drm_dp_nak_reply { 260 u8 guid[16]; 261 u8 reason; 262 u8 nak_data; 263 }; 264 265 struct drm_dp_link_address_ack_reply { 266 u8 guid[16]; 267 u8 nports; 268 struct drm_dp_link_addr_reply_port { 269 bool input_port; 270 u8 peer_device_type; 271 u8 port_number; 272 bool mcs; 273 bool ddps; 274 bool legacy_device_plug_status; 275 u8 dpcd_revision; 276 u8 peer_guid[16]; 277 u8 num_sdp_streams; 278 u8 num_sdp_stream_sinks; 279 } ports[16]; 280 }; 281 282 struct drm_dp_remote_dpcd_read_ack_reply { 283 u8 port_number; 284 u8 num_bytes; 285 u8 bytes[255]; 286 }; 287 288 struct drm_dp_remote_dpcd_write_ack_reply { 289 u8 port_number; 290 }; 291 292 struct drm_dp_remote_dpcd_write_nak_reply { 293 u8 port_number; 294 u8 reason; 295 u8 bytes_written_before_failure; 296 }; 297 298 struct drm_dp_remote_i2c_read_ack_reply { 299 u8 port_number; 300 u8 num_bytes; 301 u8 bytes[255]; 302 }; 303 304 struct drm_dp_remote_i2c_read_nak_reply { 305 u8 port_number; 306 u8 nak_reason; 307 u8 i2c_nak_transaction; 308 }; 309 310 struct drm_dp_remote_i2c_write_ack_reply { 311 u8 port_number; 312 }; 313 314 315 struct drm_dp_sideband_msg_rx { 316 u8 chunk[48]; 317 u8 msg[256]; 318 u8 curchunk_len; 319 u8 curchunk_idx; /* chunk we are parsing now */ 320 u8 curchunk_hdrlen; 321 u8 curlen; /* total length of the msg */ 322 bool have_somt; 323 bool have_eomt; 324 struct drm_dp_sideband_msg_hdr initial_hdr; 325 }; 326 327 #define DRM_DP_MAX_SDP_STREAMS 16 328 struct drm_dp_allocate_payload { 329 u8 port_number; 330 u8 number_sdp_streams; 331 u8 vcpi; 332 u16 pbn; 333 u8 sdp_stream_sink[DRM_DP_MAX_SDP_STREAMS]; 334 }; 335 336 struct drm_dp_allocate_payload_ack_reply { 337 u8 port_number; 338 u8 vcpi; 339 u16 allocated_pbn; 340 }; 341 342 struct drm_dp_connection_status_notify { 343 u8 guid[16]; 344 u8 port_number; 345 bool legacy_device_plug_status; 346 bool displayport_device_plug_status; 347 bool message_capability_status; 348 bool input_port; 349 u8 peer_device_type; 350 }; 351 352 struct drm_dp_remote_dpcd_read { 353 u8 port_number; 354 u32 dpcd_address; 355 u8 num_bytes; 356 }; 357 358 struct drm_dp_remote_dpcd_write { 359 u8 port_number; 360 u32 dpcd_address; 361 u8 num_bytes; 362 u8 *bytes; 363 }; 364 365 #define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4 366 struct drm_dp_remote_i2c_read { 367 u8 num_transactions; 368 u8 port_number; 369 struct drm_dp_remote_i2c_read_tx { 370 u8 i2c_dev_id; 371 u8 num_bytes; 372 u8 *bytes; 373 u8 no_stop_bit; 374 u8 i2c_transaction_delay; 375 } transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS]; 376 u8 read_i2c_device_id; 377 u8 num_bytes_read; 378 }; 379 380 struct drm_dp_remote_i2c_write { 381 u8 port_number; 382 u8 write_i2c_device_id; 383 u8 num_bytes; 384 u8 *bytes; 385 }; 386 387 /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */ 388 struct drm_dp_port_number_req { 389 u8 port_number; 390 }; 391 392 struct drm_dp_enum_path_resources_ack_reply { 393 u8 port_number; 394 bool fec_capable; 395 u16 full_payload_bw_number; 396 u16 avail_payload_bw_number; 397 }; 398 399 /* covers POWER_DOWN_PHY, POWER_UP_PHY */ 400 struct drm_dp_port_number_rep { 401 u8 port_number; 402 }; 403 404 struct drm_dp_query_payload { 405 u8 port_number; 406 u8 vcpi; 407 }; 408 409 struct drm_dp_resource_status_notify { 410 u8 port_number; 411 u8 guid[16]; 412 u16 available_pbn; 413 }; 414 415 struct drm_dp_query_payload_ack_reply { 416 u8 port_number; 417 u16 allocated_pbn; 418 }; 419 420 struct drm_dp_sideband_msg_req_body { 421 u8 req_type; 422 union ack_req { 423 struct drm_dp_connection_status_notify conn_stat; 424 struct drm_dp_port_number_req port_num; 425 struct drm_dp_resource_status_notify resource_stat; 426 427 struct drm_dp_query_payload query_payload; 428 struct drm_dp_allocate_payload allocate_payload; 429 430 struct drm_dp_remote_dpcd_read dpcd_read; 431 struct drm_dp_remote_dpcd_write dpcd_write; 432 433 struct drm_dp_remote_i2c_read i2c_read; 434 struct drm_dp_remote_i2c_write i2c_write; 435 } u; 436 }; 437 438 struct drm_dp_sideband_msg_reply_body { 439 u8 reply_type; 440 u8 req_type; 441 union ack_replies { 442 struct drm_dp_nak_reply nak; 443 struct drm_dp_link_address_ack_reply link_addr; 444 struct drm_dp_port_number_rep port_number; 445 446 struct drm_dp_enum_path_resources_ack_reply path_resources; 447 struct drm_dp_allocate_payload_ack_reply allocate_payload; 448 struct drm_dp_query_payload_ack_reply query_payload; 449 450 struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack; 451 struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack; 452 struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack; 453 454 struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack; 455 struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack; 456 struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack; 457 } u; 458 }; 459 460 /* msg is queued to be put into a slot */ 461 #define DRM_DP_SIDEBAND_TX_QUEUED 0 462 /* msg has started transmitting on a slot - still on msgq */ 463 #define DRM_DP_SIDEBAND_TX_START_SEND 1 464 /* msg has finished transmitting on a slot - removed from msgq only in slot */ 465 #define DRM_DP_SIDEBAND_TX_SENT 2 466 /* msg has received a response - removed from slot */ 467 #define DRM_DP_SIDEBAND_TX_RX 3 468 #define DRM_DP_SIDEBAND_TX_TIMEOUT 4 469 470 struct drm_dp_sideband_msg_tx { 471 u8 msg[256]; 472 u8 chunk[48]; 473 u8 cur_offset; 474 u8 cur_len; 475 struct drm_dp_mst_branch *dst; 476 struct list_head next; 477 int seqno; 478 int state; 479 bool path_msg; 480 struct drm_dp_sideband_msg_reply_body reply; 481 }; 482 483 /* sideband msg handler */ 484 struct drm_dp_mst_topology_mgr; 485 struct drm_dp_mst_topology_cbs { 486 /* create a connector for a port */ 487 struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path); 488 void (*register_connector)(struct drm_connector *connector); 489 void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr, 490 struct drm_connector *connector); 491 }; 492 493 #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8) 494 495 #define DP_PAYLOAD_LOCAL 1 496 #define DP_PAYLOAD_REMOTE 2 497 #define DP_PAYLOAD_DELETE_LOCAL 3 498 499 struct drm_dp_payload { 500 int payload_state; 501 int start_slot; 502 int num_slots; 503 int vcpi; 504 }; 505 506 #define to_dp_mst_topology_state(x) container_of(x, struct drm_dp_mst_topology_state, base) 507 508 struct drm_dp_vcpi_allocation { 509 struct drm_dp_mst_port *port; 510 int vcpi; 511 int pbn; 512 bool dsc_enabled; 513 struct list_head next; 514 }; 515 516 struct drm_dp_mst_topology_state { 517 struct drm_private_state base; 518 struct list_head vcpis; 519 struct drm_dp_mst_topology_mgr *mgr; 520 }; 521 522 #define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base) 523 524 /** 525 * struct drm_dp_mst_topology_mgr - DisplayPort MST manager 526 * 527 * This struct represents the toplevel displayport MST topology manager. 528 * There should be one instance of this for every MST capable DP connector 529 * on the GPU. 530 */ 531 struct drm_dp_mst_topology_mgr { 532 /** 533 * @base: Base private object for atomic 534 */ 535 struct drm_private_obj base; 536 537 /** 538 * @dev: device pointer for adding i2c devices etc. 539 */ 540 struct drm_device *dev; 541 /** 542 * @cbs: callbacks for connector addition and destruction. 543 */ 544 const struct drm_dp_mst_topology_cbs *cbs; 545 /** 546 * @max_dpcd_transaction_bytes: maximum number of bytes to read/write 547 * in one go. 548 */ 549 int max_dpcd_transaction_bytes; 550 /** 551 * @aux: AUX channel for the DP MST connector this topolgy mgr is 552 * controlling. 553 */ 554 struct drm_dp_aux *aux; 555 /** 556 * @max_payloads: maximum number of payloads the GPU can generate. 557 */ 558 int max_payloads; 559 /** 560 * @conn_base_id: DRM connector ID this mgr is connected to. Only used 561 * to build the MST connector path value. 562 */ 563 int conn_base_id; 564 565 /** 566 * @down_rep_recv: Message receiver state for down replies. 567 */ 568 struct drm_dp_sideband_msg_rx down_rep_recv; 569 /** 570 * @up_req_recv: Message receiver state for up requests. 571 */ 572 struct drm_dp_sideband_msg_rx up_req_recv; 573 574 /** 575 * @lock: protects @mst_state, @mst_primary, @dpcd, and 576 * @payload_id_table_cleared. 577 */ 578 struct mutex lock; 579 580 /** 581 * @probe_lock: Prevents @work and @up_req_work, the only writers of 582 * &drm_dp_mst_port.mstb and &drm_dp_mst_branch.ports, from racing 583 * while they update the topology. 584 */ 585 struct mutex probe_lock; 586 587 /** 588 * @mst_state: If this manager is enabled for an MST capable port. False 589 * if no MST sink/branch devices is connected. 590 */ 591 bool mst_state : 1; 592 593 /** 594 * @payload_id_table_cleared: Whether or not we've cleared the payload 595 * ID table for @mst_primary. Protected by @lock. 596 */ 597 bool payload_id_table_cleared : 1; 598 599 /** 600 * @mst_primary: Pointer to the primary/first branch device. 601 */ 602 struct drm_dp_mst_branch *mst_primary; 603 604 /** 605 * @dpcd: Cache of DPCD for primary port. 606 */ 607 u8 dpcd[DP_RECEIVER_CAP_SIZE]; 608 /** 609 * @sink_count: Sink count from DEVICE_SERVICE_IRQ_VECTOR_ESI0. 610 */ 611 u8 sink_count; 612 /** 613 * @pbn_div: PBN to slots divisor. 614 */ 615 int pbn_div; 616 617 /** 618 * @funcs: Atomic helper callbacks 619 */ 620 const struct drm_private_state_funcs *funcs; 621 622 /** 623 * @qlock: protects @tx_msg_downq, the &drm_dp_mst_branch.txslost and 624 * &drm_dp_sideband_msg_tx.state once they are queued 625 */ 626 struct mutex qlock; 627 628 /** 629 * @is_waiting_for_dwn_reply: indicate whether is waiting for down reply 630 */ 631 bool is_waiting_for_dwn_reply; 632 633 /** 634 * @tx_msg_downq: List of pending down replies. 635 */ 636 struct list_head tx_msg_downq; 637 638 /** 639 * @payload_lock: Protect payload information. 640 */ 641 struct mutex payload_lock; 642 /** 643 * @proposed_vcpis: Array of pointers for the new VCPI allocation. The 644 * VCPI structure itself is &drm_dp_mst_port.vcpi. 645 */ 646 struct drm_dp_vcpi **proposed_vcpis; 647 /** 648 * @payloads: Array of payloads. 649 */ 650 struct drm_dp_payload *payloads; 651 /** 652 * @payload_mask: Elements of @payloads actually in use. Since 653 * reallocation of active outputs isn't possible gaps can be created by 654 * disabling outputs out of order compared to how they've been enabled. 655 */ 656 unsigned long payload_mask; 657 /** 658 * @vcpi_mask: Similar to @payload_mask, but for @proposed_vcpis. 659 */ 660 unsigned long vcpi_mask; 661 662 /** 663 * @tx_waitq: Wait to queue stall for the tx worker. 664 */ 665 #ifdef __NetBSD__ 666 drm_waitqueue_t tx_waitq; 667 #else 668 wait_queue_head_t tx_waitq; 669 #endif 670 /** 671 * @work: Probe work. 672 */ 673 struct work_struct work; 674 /** 675 * @tx_work: Sideband transmit worker. This can nest within the main 676 * @work worker for each transaction @work launches. 677 */ 678 struct work_struct tx_work; 679 680 /** 681 * @destroy_port_list: List of to be destroyed connectors. 682 */ 683 struct list_head destroy_port_list; 684 /** 685 * @destroy_branch_device_list: List of to be destroyed branch 686 * devices. 687 */ 688 struct list_head destroy_branch_device_list; 689 /** 690 * @delayed_destroy_lock: Protects @destroy_port_list and 691 * @destroy_branch_device_list. 692 */ 693 struct mutex delayed_destroy_lock; 694 /** 695 * @delayed_destroy_work: Work item to destroy MST port and branch 696 * devices, needed to avoid locking inversion. 697 */ 698 struct work_struct delayed_destroy_work; 699 700 /** 701 * @up_req_list: List of pending up requests from the topology that 702 * need to be processed, in chronological order. 703 */ 704 struct list_head up_req_list; 705 /** 706 * @up_req_lock: Protects @up_req_list 707 */ 708 struct mutex up_req_lock; 709 /** 710 * @up_req_work: Work item to process up requests received from the 711 * topology. Needed to avoid blocking hotplug handling and sideband 712 * transmissions. 713 */ 714 struct work_struct up_req_work; 715 716 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) 717 /** 718 * @topology_ref_history_lock: protects 719 * &drm_dp_mst_port.topology_ref_history and 720 * &drm_dp_mst_branch.topology_ref_history. 721 */ 722 struct mutex topology_ref_history_lock; 723 #endif 724 }; 725 726 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, 727 struct drm_device *dev, struct drm_dp_aux *aux, 728 int max_dpcd_transaction_bytes, 729 int max_payloads, int conn_base_id); 730 731 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr); 732 733 734 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state); 735 736 737 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled); 738 739 740 int 741 drm_dp_mst_detect_port(struct drm_connector *connector, 742 struct drm_modeset_acquire_ctx *ctx, 743 struct drm_dp_mst_topology_mgr *mgr, 744 struct drm_dp_mst_port *port); 745 746 bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr, 747 struct drm_dp_mst_port *port); 748 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); 749 750 751 int drm_dp_calc_pbn_mode(int clock, int bpp, bool dsc); 752 753 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, 754 struct drm_dp_mst_port *port, int pbn, int slots); 755 756 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); 757 758 759 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); 760 761 762 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, 763 struct drm_dp_mst_port *port); 764 765 766 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, 767 int pbn); 768 769 770 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr); 771 772 773 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr); 774 775 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr); 776 777 #ifdef CONFIG_DEBUG_FS 778 void drm_dp_mst_dump_topology(struct seq_file *m, 779 struct drm_dp_mst_topology_mgr *mgr); 780 #endif 781 782 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr); 783 int __must_check 784 drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr, 785 bool sync); 786 787 ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux, 788 unsigned int offset, void *buffer, size_t size); 789 ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux, 790 unsigned int offset, void *buffer, size_t size); 791 792 int drm_dp_mst_connector_late_register(struct drm_connector *connector, 793 struct drm_dp_mst_port *port); 794 void drm_dp_mst_connector_early_unregister(struct drm_connector *connector, 795 struct drm_dp_mst_port *port); 796 797 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state, 798 struct drm_dp_mst_topology_mgr *mgr); 799 int __must_check 800 drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state, 801 struct drm_dp_mst_topology_mgr *mgr, 802 struct drm_dp_mst_port *port, int pbn, 803 int pbn_div); 804 int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state, 805 struct drm_dp_mst_port *port, 806 int pbn, int pbn_div, 807 bool enable); 808 int __must_check 809 drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state, 810 struct drm_dp_mst_topology_mgr *mgr); 811 int __must_check 812 drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state, 813 struct drm_dp_mst_topology_mgr *mgr, 814 struct drm_dp_mst_port *port); 815 int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, 816 struct drm_dp_mst_port *port, bool power_up); 817 int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state); 818 819 void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port); 820 void drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port); 821 822 struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port); 823 824 extern const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs; 825 826 /** 827 * __drm_dp_mst_state_iter_get - private atomic state iterator function for 828 * macro-internal use 829 * @state: &struct drm_atomic_state pointer 830 * @mgr: pointer to the &struct drm_dp_mst_topology_mgr iteration cursor 831 * @old_state: optional pointer to the old &struct drm_dp_mst_topology_state 832 * iteration cursor 833 * @new_state: optional pointer to the new &struct drm_dp_mst_topology_state 834 * iteration cursor 835 * @i: int iteration cursor, for macro-internal use 836 * 837 * Used by for_each_oldnew_mst_mgr_in_state(), 838 * for_each_old_mst_mgr_in_state(), and for_each_new_mst_mgr_in_state(). Don't 839 * call this directly. 840 * 841 * Returns: 842 * True if the current &struct drm_private_obj is a &struct 843 * drm_dp_mst_topology_mgr, false otherwise. 844 */ 845 static inline bool 846 __drm_dp_mst_state_iter_get(struct drm_atomic_state *state, 847 struct drm_dp_mst_topology_mgr **mgr, 848 struct drm_dp_mst_topology_state **old_state, 849 struct drm_dp_mst_topology_state **new_state, 850 int i) 851 { 852 struct __drm_private_objs_state *objs_state = &state->private_objs[i]; 853 854 if (objs_state->ptr->funcs != &drm_dp_mst_topology_state_funcs) 855 return false; 856 857 *mgr = to_dp_mst_topology_mgr(objs_state->ptr); 858 if (old_state) 859 *old_state = to_dp_mst_topology_state(objs_state->old_state); 860 if (new_state) 861 *new_state = to_dp_mst_topology_state(objs_state->new_state); 862 863 return true; 864 } 865 866 /** 867 * for_each_oldnew_mst_mgr_in_state - iterate over all DP MST topology 868 * managers in an atomic update 869 * @__state: &struct drm_atomic_state pointer 870 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor 871 * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old 872 * state 873 * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new 874 * state 875 * @__i: int iteration cursor, for macro-internal use 876 * 877 * This iterates over all DRM DP MST topology managers in an atomic update, 878 * tracking both old and new state. This is useful in places where the state 879 * delta needs to be considered, for example in atomic check functions. 880 */ 881 #define for_each_oldnew_mst_mgr_in_state(__state, mgr, old_state, new_state, __i) \ 882 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \ 883 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), &(new_state), (__i))) 884 885 /** 886 * for_each_old_mst_mgr_in_state - iterate over all DP MST topology managers 887 * in an atomic update 888 * @__state: &struct drm_atomic_state pointer 889 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor 890 * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old 891 * state 892 * @__i: int iteration cursor, for macro-internal use 893 * 894 * This iterates over all DRM DP MST topology managers in an atomic update, 895 * tracking only the old state. This is useful in disable functions, where we 896 * need the old state the hardware is still in. 897 */ 898 #define for_each_old_mst_mgr_in_state(__state, mgr, old_state, __i) \ 899 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \ 900 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), NULL, (__i))) 901 902 /** 903 * for_each_new_mst_mgr_in_state - iterate over all DP MST topology managers 904 * in an atomic update 905 * @__state: &struct drm_atomic_state pointer 906 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor 907 * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new 908 * state 909 * @__i: int iteration cursor, for macro-internal use 910 * 911 * This iterates over all DRM DP MST topology managers in an atomic update, 912 * tracking only the new state. This is useful in enable functions, where we 913 * need the new state the hardware should be in when the atomic commit 914 * operation has completed. 915 */ 916 #define for_each_new_mst_mgr_in_state(__state, mgr, new_state, __i) \ 917 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \ 918 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), NULL, &(new_state), (__i))) 919 920 #endif 921
Indexes created Sun Sep 21 20:09:37 GMT 2025