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1/*2 * Copyright © 2014 Red Hat.3 *4 * Permission to use, copy, modify, distribute, and sell this software and its5 * documentation for any purpose is hereby granted without fee, provided that6 * the above copyright notice appear in all copies and that both that copyright7 * notice and this permission notice appear in supporting documentation, and8 * that the name of the copyright holders not be used in advertising or9 * publicity pertaining to distribution of the software without specific,10 * written prior permission. The copyright holders make no representations11 * about the suitability of this software for any purpose. It is provided "as12 * 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 NO16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE20 * OF THIS SOFTWARE.21 */22#ifndef _DRM_DP_MST_HELPER_H_23#define _DRM_DP_MST_HELPER_H_24 25#include <linux/types.h>26#include <drm/display/drm_dp_helper.h>27#include <drm/drm_atomic.h>28#include <drm/drm_fixed.h>29 30#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)31#include <linux/stackdepot.h>32#include <linux/timekeeping.h>33 34enum drm_dp_mst_topology_ref_type {35 DRM_DP_MST_TOPOLOGY_REF_GET,36 DRM_DP_MST_TOPOLOGY_REF_PUT,37};38 39struct drm_dp_mst_topology_ref_history {40 struct drm_dp_mst_topology_ref_entry {41 enum drm_dp_mst_topology_ref_type type;42 int count;43 ktime_t ts_nsec;44 depot_stack_handle_t backtrace;45 } *entries;46 int len;47};48#endif /* IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) */49 50enum drm_dp_mst_payload_allocation {51 DRM_DP_MST_PAYLOAD_ALLOCATION_NONE,52 DRM_DP_MST_PAYLOAD_ALLOCATION_LOCAL,53 DRM_DP_MST_PAYLOAD_ALLOCATION_DFP,54 DRM_DP_MST_PAYLOAD_ALLOCATION_REMOTE,55};56 57struct drm_dp_mst_branch;58 59/**60 * struct drm_dp_mst_port - MST port61 * @port_num: port number62 * @input: if this port is an input port. Protected by63 * &drm_dp_mst_topology_mgr.base.lock.64 * @mcs: message capability status - DP 1.2 spec. Protected by65 * &drm_dp_mst_topology_mgr.base.lock.66 * @ddps: DisplayPort Device Plug Status - DP 1.2. Protected by67 * &drm_dp_mst_topology_mgr.base.lock.68 * @pdt: Peer Device Type. Protected by69 * &drm_dp_mst_topology_mgr.base.lock.70 * @ldps: Legacy Device Plug Status. Protected by71 * &drm_dp_mst_topology_mgr.base.lock.72 * @dpcd_rev: DPCD revision of device on this port. Protected by73 * &drm_dp_mst_topology_mgr.base.lock.74 * @num_sdp_streams: Number of simultaneous streams. Protected by75 * &drm_dp_mst_topology_mgr.base.lock.76 * @num_sdp_stream_sinks: Number of stream sinks. Protected by77 * &drm_dp_mst_topology_mgr.base.lock.78 * @full_pbn: Max possible bandwidth for this port. Protected by79 * &drm_dp_mst_topology_mgr.base.lock.80 * @next: link to next port on this branch device81 * @aux: i2c aux transport to talk to device connected to this port, protected82 * by &drm_dp_mst_topology_mgr.base.lock.83 * @passthrough_aux: parent aux to which DSC pass-through requests should be84 * sent, only set if DSC pass-through is possible.85 * @parent: branch device parent of this port86 * @connector: DRM connector this port is connected to. Protected by87 * &drm_dp_mst_topology_mgr.base.lock.88 * @mgr: topology manager this port lives under.89 *90 * This structure represents an MST port endpoint on a device somewhere91 * in the MST topology.92 */93struct drm_dp_mst_port {94 /**95 * @topology_kref: refcount for this port's lifetime in the topology,96 * only the DP MST helpers should need to touch this97 */98 struct kref topology_kref;99 100 /**101 * @malloc_kref: refcount for the memory allocation containing this102 * structure. See drm_dp_mst_get_port_malloc() and103 * drm_dp_mst_put_port_malloc().104 */105 struct kref malloc_kref;106 107#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)108 /**109 * @topology_ref_history: A history of each topology110 * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS.111 */112 struct drm_dp_mst_topology_ref_history topology_ref_history;113#endif114 115 u8 port_num;116 bool input;117 bool mcs;118 bool ddps;119 u8 pdt;120 bool ldps;121 u8 dpcd_rev;122 u8 num_sdp_streams;123 u8 num_sdp_stream_sinks;124 uint16_t full_pbn;125 struct list_head next;126 /**127 * @mstb: the branch device connected to this port, if there is one.128 * This should be considered protected for reading by129 * &drm_dp_mst_topology_mgr.lock. There are two exceptions to this:130 * &drm_dp_mst_topology_mgr.up_req_work and131 * &drm_dp_mst_topology_mgr.work, which do not grab132 * &drm_dp_mst_topology_mgr.lock during reads but are the only133 * updaters of this list and are protected from writing concurrently134 * by &drm_dp_mst_topology_mgr.probe_lock.135 */136 struct drm_dp_mst_branch *mstb;137 struct drm_dp_aux aux; /* i2c bus for this port? */138 struct drm_dp_aux *passthrough_aux;139 struct drm_dp_mst_branch *parent;140 141 struct drm_connector *connector;142 struct drm_dp_mst_topology_mgr *mgr;143 144 /**145 * @cached_edid: for DP logical ports - make tiling work by ensuring146 * that the EDID for all connectors is read immediately.147 */148 const struct drm_edid *cached_edid;149 150 /**151 * @fec_capable: bool indicating if FEC can be supported up to that152 * point in the MST topology.153 */154 bool fec_capable;155};156 157/* sideband msg header - not bit struct */158struct drm_dp_sideband_msg_hdr {159 u8 lct;160 u8 lcr;161 u8 rad[8];162 bool broadcast;163 bool path_msg;164 u8 msg_len;165 bool somt;166 bool eomt;167 bool seqno;168};169 170struct drm_dp_sideband_msg_rx {171 u8 chunk[48];172 u8 msg[256];173 u8 curchunk_len;174 u8 curchunk_idx; /* chunk we are parsing now */175 u8 curchunk_hdrlen;176 u8 curlen; /* total length of the msg */177 bool have_somt;178 bool have_eomt;179 struct drm_dp_sideband_msg_hdr initial_hdr;180};181 182/**183 * struct drm_dp_mst_branch - MST branch device.184 * @rad: Relative Address to talk to this branch device.185 * @lct: Link count total to talk to this branch device.186 * @num_ports: number of ports on the branch.187 * @port_parent: pointer to the port parent, NULL if toplevel.188 * @mgr: topology manager for this branch device.189 * @link_address_sent: if a link address message has been sent to this device yet.190 * @guid: guid for DP 1.2 branch device. port under this branch can be191 * identified by port #.192 *193 * This structure represents an MST branch device, there is one194 * primary branch device at the root, along with any other branches connected195 * to downstream port of parent branches.196 */197struct drm_dp_mst_branch {198 /**199 * @topology_kref: refcount for this branch device's lifetime in the200 * topology, only the DP MST helpers should need to touch this201 */202 struct kref topology_kref;203 204 /**205 * @malloc_kref: refcount for the memory allocation containing this206 * structure. See drm_dp_mst_get_mstb_malloc() and207 * drm_dp_mst_put_mstb_malloc().208 */209 struct kref malloc_kref;210 211#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)212 /**213 * @topology_ref_history: A history of each topology214 * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS.215 */216 struct drm_dp_mst_topology_ref_history topology_ref_history;217#endif218 219 /**220 * @destroy_next: linked-list entry used by221 * drm_dp_delayed_destroy_work()222 */223 struct list_head destroy_next;224 225 u8 rad[8];226 u8 lct;227 int num_ports;228 229 /**230 * @ports: the list of ports on this branch device. This should be231 * considered protected for reading by &drm_dp_mst_topology_mgr.lock.232 * There are two exceptions to this:233 * &drm_dp_mst_topology_mgr.up_req_work and234 * &drm_dp_mst_topology_mgr.work, which do not grab235 * &drm_dp_mst_topology_mgr.lock during reads but are the only236 * updaters of this list and are protected from updating the list237 * concurrently by @drm_dp_mst_topology_mgr.probe_lock238 */239 struct list_head ports;240 241 struct drm_dp_mst_port *port_parent;242 struct drm_dp_mst_topology_mgr *mgr;243 244 bool link_address_sent;245 246 /* global unique identifier to identify branch devices */247 guid_t guid;248};249 250 251struct drm_dp_nak_reply {252 guid_t guid;253 u8 reason;254 u8 nak_data;255};256 257struct drm_dp_link_address_ack_reply {258 guid_t guid;259 u8 nports;260 struct drm_dp_link_addr_reply_port {261 bool input_port;262 u8 peer_device_type;263 u8 port_number;264 bool mcs;265 bool ddps;266 bool legacy_device_plug_status;267 u8 dpcd_revision;268 guid_t peer_guid;269 u8 num_sdp_streams;270 u8 num_sdp_stream_sinks;271 } ports[16];272};273 274struct drm_dp_remote_dpcd_read_ack_reply {275 u8 port_number;276 u8 num_bytes;277 u8 bytes[255];278};279 280struct drm_dp_remote_dpcd_write_ack_reply {281 u8 port_number;282};283 284struct drm_dp_remote_dpcd_write_nak_reply {285 u8 port_number;286 u8 reason;287 u8 bytes_written_before_failure;288};289 290struct drm_dp_remote_i2c_read_ack_reply {291 u8 port_number;292 u8 num_bytes;293 u8 bytes[255];294};295 296struct drm_dp_remote_i2c_read_nak_reply {297 u8 port_number;298 u8 nak_reason;299 u8 i2c_nak_transaction;300};301 302struct drm_dp_remote_i2c_write_ack_reply {303 u8 port_number;304};305 306struct drm_dp_query_stream_enc_status_ack_reply {307 /* Bit[23:16]- Stream Id */308 u8 stream_id;309 310 /* Bit[15]- Signed */311 bool reply_signed;312 313 /* Bit[10:8]- Stream Output Sink Type */314 bool unauthorizable_device_present;315 bool legacy_device_present;316 bool query_capable_device_present;317 318 /* Bit[12:11]- Stream Output CP Type */319 bool hdcp_1x_device_present;320 bool hdcp_2x_device_present;321 322 /* Bit[4]- Stream Authentication */323 bool auth_completed;324 325 /* Bit[3]- Stream Encryption */326 bool encryption_enabled;327 328 /* Bit[2]- Stream Repeater Function Present */329 bool repeater_present;330 331 /* Bit[1:0]- Stream State */332 u8 state;333};334 335#define DRM_DP_MAX_SDP_STREAMS 16336struct drm_dp_allocate_payload {337 u8 port_number;338 u8 number_sdp_streams;339 u8 vcpi;340 u16 pbn;341 u8 sdp_stream_sink[DRM_DP_MAX_SDP_STREAMS];342};343 344struct drm_dp_allocate_payload_ack_reply {345 u8 port_number;346 u8 vcpi;347 u16 allocated_pbn;348};349 350struct drm_dp_connection_status_notify {351 guid_t guid;352 u8 port_number;353 bool legacy_device_plug_status;354 bool displayport_device_plug_status;355 bool message_capability_status;356 bool input_port;357 u8 peer_device_type;358};359 360struct drm_dp_remote_dpcd_read {361 u8 port_number;362 u32 dpcd_address;363 u8 num_bytes;364};365 366struct drm_dp_remote_dpcd_write {367 u8 port_number;368 u32 dpcd_address;369 u8 num_bytes;370 u8 *bytes;371};372 373#define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4374struct drm_dp_remote_i2c_read {375 u8 num_transactions;376 u8 port_number;377 struct drm_dp_remote_i2c_read_tx {378 u8 i2c_dev_id;379 u8 num_bytes;380 u8 *bytes;381 u8 no_stop_bit;382 u8 i2c_transaction_delay;383 } transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS];384 u8 read_i2c_device_id;385 u8 num_bytes_read;386};387 388struct drm_dp_remote_i2c_write {389 u8 port_number;390 u8 write_i2c_device_id;391 u8 num_bytes;392 u8 *bytes;393};394 395struct drm_dp_query_stream_enc_status {396 u8 stream_id;397 u8 client_id[7]; /* 56-bit nonce */398 u8 stream_event;399 bool valid_stream_event;400 u8 stream_behavior;401 u8 valid_stream_behavior;402};403 404/* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */405struct drm_dp_port_number_req {406 u8 port_number;407};408 409struct drm_dp_enum_path_resources_ack_reply {410 u8 port_number;411 bool fec_capable;412 u16 full_payload_bw_number;413 u16 avail_payload_bw_number;414};415 416/* covers POWER_DOWN_PHY, POWER_UP_PHY */417struct drm_dp_port_number_rep {418 u8 port_number;419};420 421struct drm_dp_query_payload {422 u8 port_number;423 u8 vcpi;424};425 426struct drm_dp_resource_status_notify {427 u8 port_number;428 guid_t guid;429 u16 available_pbn;430};431 432struct drm_dp_query_payload_ack_reply {433 u8 port_number;434 u16 allocated_pbn;435};436 437struct drm_dp_sideband_msg_req_body {438 u8 req_type;439 union ack_req {440 struct drm_dp_connection_status_notify conn_stat;441 struct drm_dp_port_number_req port_num;442 struct drm_dp_resource_status_notify resource_stat;443 444 struct drm_dp_query_payload query_payload;445 struct drm_dp_allocate_payload allocate_payload;446 447 struct drm_dp_remote_dpcd_read dpcd_read;448 struct drm_dp_remote_dpcd_write dpcd_write;449 450 struct drm_dp_remote_i2c_read i2c_read;451 struct drm_dp_remote_i2c_write i2c_write;452 453 struct drm_dp_query_stream_enc_status enc_status;454 } u;455};456 457struct drm_dp_sideband_msg_reply_body {458 u8 reply_type;459 u8 req_type;460 union ack_replies {461 struct drm_dp_nak_reply nak;462 struct drm_dp_link_address_ack_reply link_addr;463 struct drm_dp_port_number_rep port_number;464 465 struct drm_dp_enum_path_resources_ack_reply path_resources;466 struct drm_dp_allocate_payload_ack_reply allocate_payload;467 struct drm_dp_query_payload_ack_reply query_payload;468 469 struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;470 struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;471 struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;472 473 struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;474 struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;475 struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;476 477 struct drm_dp_query_stream_enc_status_ack_reply enc_status;478 } u;479};480 481/* msg is queued to be put into a slot */482#define DRM_DP_SIDEBAND_TX_QUEUED 0483/* msg has started transmitting on a slot - still on msgq */484#define DRM_DP_SIDEBAND_TX_START_SEND 1485/* msg has finished transmitting on a slot - removed from msgq only in slot */486#define DRM_DP_SIDEBAND_TX_SENT 2487/* msg has received a response - removed from slot */488#define DRM_DP_SIDEBAND_TX_RX 3489#define DRM_DP_SIDEBAND_TX_TIMEOUT 4490 491struct drm_dp_sideband_msg_tx {492 u8 msg[256];493 u8 chunk[48];494 u8 cur_offset;495 u8 cur_len;496 struct drm_dp_mst_branch *dst;497 struct list_head next;498 int seqno;499 int state;500 bool path_msg;501 struct drm_dp_sideband_msg_reply_body reply;502};503 504/* sideband msg handler */505struct drm_dp_mst_topology_mgr;506struct drm_dp_mst_topology_cbs {507 /* create a connector for a port */508 struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path);509 /*510 * Checks for any pending MST interrupts, passing them to MST core for511 * processing, the same way an HPD IRQ pulse handler would do this.512 * If provided MST core calls this callback from a poll-waiting loop513 * when waiting for MST down message replies. The driver is expected514 * to guard against a race between this callback and the driver's HPD515 * IRQ pulse handler.516 */517 void (*poll_hpd_irq)(struct drm_dp_mst_topology_mgr *mgr);518};519 520#define to_dp_mst_topology_state(x) container_of(x, struct drm_dp_mst_topology_state, base)521 522/**523 * struct drm_dp_mst_atomic_payload - Atomic state struct for an MST payload524 *525 * The primary atomic state structure for a given MST payload. Stores information like current526 * bandwidth allocation, intended action for this payload, etc.527 */528struct drm_dp_mst_atomic_payload {529 /** @port: The MST port assigned to this payload */530 struct drm_dp_mst_port *port;531 532 /**533 * @vc_start_slot: The time slot that this payload starts on. Because payload start slots534 * can't be determined ahead of time, the contents of this value are UNDEFINED at atomic535 * check time. This shouldn't usually matter, as the start slot should never be relevant for536 * atomic state computations.537 *538 * Since this value is determined at commit time instead of check time, this value is539 * protected by the MST helpers ensuring that async commits operating on the given topology540 * never run in parallel. In the event that a driver does need to read this value (e.g. to541 * inform hardware of the starting timeslot for a payload), the driver may either:542 *543 * * Read this field during the atomic commit after544 * drm_dp_mst_atomic_wait_for_dependencies() has been called, which will ensure the545 * previous MST states payload start slots have been copied over to the new state. Note546 * that a new start slot won't be assigned/removed from this payload until547 * drm_dp_add_payload_part1()/drm_dp_remove_payload_part2() have been called.548 * * Acquire the MST modesetting lock, and then wait for any pending MST-related commits to549 * get committed to hardware by calling drm_crtc_commit_wait() on each of the550 * &drm_crtc_commit structs in &drm_dp_mst_topology_state.commit_deps.551 *552 * If neither of the two above solutions suffice (e.g. the driver needs to read the start553 * slot in the middle of an atomic commit without waiting for some reason), then drivers554 * should cache this value themselves after changing payloads.555 */556 s8 vc_start_slot;557 558 /** @vcpi: The Virtual Channel Payload Identifier */559 u8 vcpi;560 /**561 * @time_slots:562 * The number of timeslots allocated to this payload from the source DP Tx to563 * the immediate downstream DP Rx564 */565 int time_slots;566 /** @pbn: The payload bandwidth for this payload */567 int pbn;568 569 /** @delete: Whether or not we intend to delete this payload during this atomic commit */570 bool delete : 1;571 /** @dsc_enabled: Whether or not this payload has DSC enabled */572 bool dsc_enabled : 1;573 574 /** @payload_allocation_status: The allocation status of this payload */575 enum drm_dp_mst_payload_allocation payload_allocation_status;576 577 /** @next: The list node for this payload */578 struct list_head next;579};580 581/**582 * struct drm_dp_mst_topology_state - DisplayPort MST topology atomic state583 *584 * This struct represents the atomic state of the toplevel DisplayPort MST manager585 */586struct drm_dp_mst_topology_state {587 /** @base: Base private state for atomic */588 struct drm_private_state base;589 590 /** @mgr: The topology manager */591 struct drm_dp_mst_topology_mgr *mgr;592 593 /**594 * @pending_crtc_mask: A bitmask of all CRTCs this topology state touches, drivers may595 * modify this to add additional dependencies if needed.596 */597 u32 pending_crtc_mask;598 /**599 * @commit_deps: A list of all CRTC commits affecting this topology, this field isn't600 * populated until drm_dp_mst_atomic_wait_for_dependencies() is called.601 */602 struct drm_crtc_commit **commit_deps;603 /** @num_commit_deps: The number of CRTC commits in @commit_deps */604 size_t num_commit_deps;605 606 /** @payload_mask: A bitmask of allocated VCPIs, used for VCPI assignments */607 u32 payload_mask;608 /** @payloads: The list of payloads being created/destroyed in this state */609 struct list_head payloads;610 611 /** @total_avail_slots: The total number of slots this topology can handle (63 or 64) */612 u8 total_avail_slots;613 /** @start_slot: The first usable time slot in this topology (1 or 0) */614 u8 start_slot;615 616 /**617 * @pbn_div: The current PBN divisor for this topology. The driver is expected to fill this618 * out itself.619 */620 fixed20_12 pbn_div;621};622 623#define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base)624 625/**626 * struct drm_dp_mst_topology_mgr - DisplayPort MST manager627 *628 * This struct represents the toplevel displayport MST topology manager.629 * There should be one instance of this for every MST capable DP connector630 * on the GPU.631 */632struct drm_dp_mst_topology_mgr {633 /**634 * @base: Base private object for atomic635 */636 struct drm_private_obj base;637 638 /**639 * @dev: device pointer for adding i2c devices etc.640 */641 struct drm_device *dev;642 /**643 * @cbs: callbacks for connector addition and destruction.644 */645 const struct drm_dp_mst_topology_cbs *cbs;646 /**647 * @max_dpcd_transaction_bytes: maximum number of bytes to read/write648 * in one go.649 */650 int max_dpcd_transaction_bytes;651 /**652 * @aux: AUX channel for the DP MST connector this topolgy mgr is653 * controlling.654 */655 struct drm_dp_aux *aux;656 /**657 * @max_payloads: maximum number of payloads the GPU can generate.658 */659 int max_payloads;660 /**661 * @conn_base_id: DRM connector ID this mgr is connected to. Only used662 * to build the MST connector path value.663 */664 int conn_base_id;665 666 /**667 * @up_req_recv: Message receiver state for up requests.668 */669 struct drm_dp_sideband_msg_rx up_req_recv;670 671 /**672 * @down_rep_recv: Message receiver state for replies to down673 * requests.674 */675 struct drm_dp_sideband_msg_rx down_rep_recv;676 677 /**678 * @lock: protects @mst_state, @mst_primary, @dpcd, and679 * @payload_id_table_cleared.680 */681 struct mutex lock;682 683 /**684 * @probe_lock: Prevents @work and @up_req_work, the only writers of685 * &drm_dp_mst_port.mstb and &drm_dp_mst_branch.ports, from racing686 * while they update the topology.687 */688 struct mutex probe_lock;689 690 /**691 * @mst_state: If this manager is enabled for an MST capable port. False692 * if no MST sink/branch devices is connected.693 */694 bool mst_state : 1;695 696 /**697 * @payload_id_table_cleared: Whether or not we've cleared the payload698 * ID table for @mst_primary. Protected by @lock.699 */700 bool payload_id_table_cleared : 1;701 702 /**703 * @payload_count: The number of currently active payloads in hardware. This value is only704 * intended to be used internally by MST helpers for payload tracking, and is only safe to705 * read/write from the atomic commit (not check) context.706 */707 u8 payload_count;708 709 /**710 * @next_start_slot: The starting timeslot to use for new VC payloads. This value is used711 * internally by MST helpers for payload tracking, and is only safe to read/write from the712 * atomic commit (not check) context.713 */714 u8 next_start_slot;715 716 /**717 * @mst_primary: Pointer to the primary/first branch device.718 */719 struct drm_dp_mst_branch *mst_primary;720 721 /**722 * @dpcd: Cache of DPCD for primary port.723 */724 u8 dpcd[DP_RECEIVER_CAP_SIZE];725 /**726 * @sink_count: Sink count from DEVICE_SERVICE_IRQ_VECTOR_ESI0.727 */728 u8 sink_count;729 730 /**731 * @funcs: Atomic helper callbacks732 */733 const struct drm_private_state_funcs *funcs;734 735 /**736 * @qlock: protects @tx_msg_downq and &drm_dp_sideband_msg_tx.state737 */738 struct mutex qlock;739 740 /**741 * @tx_msg_downq: List of pending down requests742 */743 struct list_head tx_msg_downq;744 745 /**746 * @tx_waitq: Wait to queue stall for the tx worker.747 */748 wait_queue_head_t tx_waitq;749 /**750 * @work: Probe work.751 */752 struct work_struct work;753 /**754 * @tx_work: Sideband transmit worker. This can nest within the main755 * @work worker for each transaction @work launches.756 */757 struct work_struct tx_work;758 759 /**760 * @destroy_port_list: List of to be destroyed connectors.761 */762 struct list_head destroy_port_list;763 /**764 * @destroy_branch_device_list: List of to be destroyed branch765 * devices.766 */767 struct list_head destroy_branch_device_list;768 /**769 * @delayed_destroy_lock: Protects @destroy_port_list and770 * @destroy_branch_device_list.771 */772 struct mutex delayed_destroy_lock;773 774 /**775 * @delayed_destroy_wq: Workqueue used for delayed_destroy_work items.776 * A dedicated WQ makes it possible to drain any requeued work items777 * on it.778 */779 struct workqueue_struct *delayed_destroy_wq;780 781 /**782 * @delayed_destroy_work: Work item to destroy MST port and branch783 * devices, needed to avoid locking inversion.784 */785 struct work_struct delayed_destroy_work;786 787 /**788 * @up_req_list: List of pending up requests from the topology that789 * need to be processed, in chronological order.790 */791 struct list_head up_req_list;792 /**793 * @up_req_lock: Protects @up_req_list794 */795 struct mutex up_req_lock;796 /**797 * @up_req_work: Work item to process up requests received from the798 * topology. Needed to avoid blocking hotplug handling and sideband799 * transmissions.800 */801 struct work_struct up_req_work;802 803#if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)804 /**805 * @topology_ref_history_lock: protects806 * &drm_dp_mst_port.topology_ref_history and807 * &drm_dp_mst_branch.topology_ref_history.808 */809 struct mutex topology_ref_history_lock;810#endif811};812 813int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,814 struct drm_device *dev, struct drm_dp_aux *aux,815 int max_dpcd_transaction_bytes,816 int max_payloads, int conn_base_id);817 818void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);819 820/**821 * enum drm_dp_mst_mode - sink's MST mode capability822 */823enum drm_dp_mst_mode {824 /**825 * @DRM_DP_SST: The sink does not support MST nor single stream sideband826 * messaging.827 */828 DRM_DP_SST,829 /**830 * @DRM_DP_MST: Sink supports MST, more than one stream and single831 * stream sideband messaging.832 */833 DRM_DP_MST,834 /**835 * @DRM_DP_SST_SIDEBAND_MSG: Sink supports only one stream and single836 * stream sideband messaging.837 */838 DRM_DP_SST_SIDEBAND_MSG,839};840 841enum drm_dp_mst_mode drm_dp_read_mst_cap(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]);842int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);843 844int drm_dp_mst_hpd_irq_handle_event(struct drm_dp_mst_topology_mgr *mgr,845 const u8 *esi,846 u8 *ack,847 bool *handled);848void drm_dp_mst_hpd_irq_send_new_request(struct drm_dp_mst_topology_mgr *mgr);849 850int851drm_dp_mst_detect_port(struct drm_connector *connector,852 struct drm_modeset_acquire_ctx *ctx,853 struct drm_dp_mst_topology_mgr *mgr,854 struct drm_dp_mst_port *port);855 856const struct drm_edid *drm_dp_mst_edid_read(struct drm_connector *connector,857 struct drm_dp_mst_topology_mgr *mgr,858 struct drm_dp_mst_port *port);859struct edid *drm_dp_mst_get_edid(struct drm_connector *connector,860 struct drm_dp_mst_topology_mgr *mgr,861 struct drm_dp_mst_port *port);862 863fixed20_12 drm_dp_get_vc_payload_bw(const struct drm_dp_mst_topology_mgr *mgr,864 int link_rate, int link_lane_count);865 866int drm_dp_calc_pbn_mode(int clock, int bpp);867 868void drm_dp_mst_update_slots(struct drm_dp_mst_topology_state *mst_state, uint8_t link_encoding_cap);869 870int drm_dp_add_payload_part1(struct drm_dp_mst_topology_mgr *mgr,871 struct drm_dp_mst_topology_state *mst_state,872 struct drm_dp_mst_atomic_payload *payload);873int drm_dp_add_payload_part2(struct drm_dp_mst_topology_mgr *mgr,874 struct drm_dp_mst_atomic_payload *payload);875void drm_dp_remove_payload_part1(struct drm_dp_mst_topology_mgr *mgr,876 struct drm_dp_mst_topology_state *mst_state,877 struct drm_dp_mst_atomic_payload *payload);878void drm_dp_remove_payload_part2(struct drm_dp_mst_topology_mgr *mgr,879 struct drm_dp_mst_topology_state *mst_state,880 const struct drm_dp_mst_atomic_payload *old_payload,881 struct drm_dp_mst_atomic_payload *new_payload);882 883int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);884 885void drm_dp_mst_dump_topology(struct seq_file *m,886 struct drm_dp_mst_topology_mgr *mgr);887 888void drm_dp_mst_topology_queue_probe(struct drm_dp_mst_topology_mgr *mgr);889 890void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);891int __must_check892drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr,893 bool sync);894 895ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux,896 unsigned int offset, void *buffer, size_t size);897ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux,898 unsigned int offset, void *buffer, size_t size);899 900int drm_dp_mst_connector_late_register(struct drm_connector *connector,901 struct drm_dp_mst_port *port);902void drm_dp_mst_connector_early_unregister(struct drm_connector *connector,903 struct drm_dp_mst_port *port);904 905struct drm_dp_mst_topology_state *906drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,907 struct drm_dp_mst_topology_mgr *mgr);908struct drm_dp_mst_topology_state *909drm_atomic_get_old_mst_topology_state(struct drm_atomic_state *state,910 struct drm_dp_mst_topology_mgr *mgr);911struct drm_dp_mst_topology_state *912drm_atomic_get_new_mst_topology_state(struct drm_atomic_state *state,913 struct drm_dp_mst_topology_mgr *mgr);914struct drm_dp_mst_atomic_payload *915drm_atomic_get_mst_payload_state(struct drm_dp_mst_topology_state *state,916 struct drm_dp_mst_port *port);917bool drm_dp_mst_port_downstream_of_parent(struct drm_dp_mst_topology_mgr *mgr,918 struct drm_dp_mst_port *port,919 struct drm_dp_mst_port *parent);920int __must_check921drm_dp_atomic_find_time_slots(struct drm_atomic_state *state,922 struct drm_dp_mst_topology_mgr *mgr,923 struct drm_dp_mst_port *port, int pbn);924int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,925 struct drm_dp_mst_port *port,926 int pbn, bool enable);927int __must_check928drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state,929 struct drm_dp_mst_topology_mgr *mgr);930int __must_check931drm_dp_atomic_release_time_slots(struct drm_atomic_state *state,932 struct drm_dp_mst_topology_mgr *mgr,933 struct drm_dp_mst_port *port);934void drm_dp_mst_atomic_wait_for_dependencies(struct drm_atomic_state *state);935int __must_check drm_dp_mst_atomic_setup_commit(struct drm_atomic_state *state);936int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,937 struct drm_dp_mst_port *port, bool power_up);938int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr,939 struct drm_dp_mst_port *port,940 struct drm_dp_query_stream_enc_status_ack_reply *status);941int __must_check drm_dp_mst_atomic_check_mgr(struct drm_atomic_state *state,942 struct drm_dp_mst_topology_mgr *mgr,943 struct drm_dp_mst_topology_state *mst_state,944 struct drm_dp_mst_port **failing_port);945int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state);946int __must_check drm_dp_mst_root_conn_atomic_check(struct drm_connector_state *new_conn_state,947 struct drm_dp_mst_topology_mgr *mgr);948 949void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port);950void drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port);951 952static inline953bool drm_dp_mst_port_is_logical(struct drm_dp_mst_port *port)954{955 return port->port_num >= DP_MST_LOGICAL_PORT_0;956}957 958struct drm_dp_aux *drm_dp_mst_aux_for_parent(struct drm_dp_mst_port *port);959struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port);960 961static inline struct drm_dp_mst_topology_state *962to_drm_dp_mst_topology_state(struct drm_private_state *state)963{964 return container_of(state, struct drm_dp_mst_topology_state, base);965}966 967extern const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs;968 969/**970 * __drm_dp_mst_state_iter_get - private atomic state iterator function for971 * macro-internal use972 * @state: &struct drm_atomic_state pointer973 * @mgr: pointer to the &struct drm_dp_mst_topology_mgr iteration cursor974 * @old_state: optional pointer to the old &struct drm_dp_mst_topology_state975 * iteration cursor976 * @new_state: optional pointer to the new &struct drm_dp_mst_topology_state977 * iteration cursor978 * @i: int iteration cursor, for macro-internal use979 *980 * Used by for_each_oldnew_mst_mgr_in_state(),981 * for_each_old_mst_mgr_in_state(), and for_each_new_mst_mgr_in_state(). Don't982 * call this directly.983 *984 * Returns:985 * True if the current &struct drm_private_obj is a &struct986 * drm_dp_mst_topology_mgr, false otherwise.987 */988static inline bool989__drm_dp_mst_state_iter_get(struct drm_atomic_state *state,990 struct drm_dp_mst_topology_mgr **mgr,991 struct drm_dp_mst_topology_state **old_state,992 struct drm_dp_mst_topology_state **new_state,993 int i)994{995 struct __drm_private_objs_state *objs_state = &state->private_objs[i];996 997 if (objs_state->ptr->funcs != &drm_dp_mst_topology_state_funcs)998 return false;999 1000 *mgr = to_dp_mst_topology_mgr(objs_state->ptr);1001 if (old_state)1002 *old_state = to_dp_mst_topology_state(objs_state->old_state);1003 if (new_state)1004 *new_state = to_dp_mst_topology_state(objs_state->new_state);1005 1006 return true;1007}1008 1009/**1010 * for_each_oldnew_mst_mgr_in_state - iterate over all DP MST topology1011 * managers in an atomic update1012 * @__state: &struct drm_atomic_state pointer1013 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor1014 * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old1015 * state1016 * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new1017 * state1018 * @__i: int iteration cursor, for macro-internal use1019 *1020 * This iterates over all DRM DP MST topology managers in an atomic update,1021 * tracking both old and new state. This is useful in places where the state1022 * delta needs to be considered, for example in atomic check functions.1023 */1024#define for_each_oldnew_mst_mgr_in_state(__state, mgr, old_state, new_state, __i) \1025 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \1026 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), &(new_state), (__i)))1027 1028/**1029 * for_each_old_mst_mgr_in_state - iterate over all DP MST topology managers1030 * in an atomic update1031 * @__state: &struct drm_atomic_state pointer1032 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor1033 * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old1034 * state1035 * @__i: int iteration cursor, for macro-internal use1036 *1037 * This iterates over all DRM DP MST topology managers in an atomic update,1038 * tracking only the old state. This is useful in disable functions, where we1039 * need the old state the hardware is still in.1040 */1041#define for_each_old_mst_mgr_in_state(__state, mgr, old_state, __i) \1042 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \1043 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), NULL, (__i)))1044 1045/**1046 * for_each_new_mst_mgr_in_state - iterate over all DP MST topology managers1047 * in an atomic update1048 * @__state: &struct drm_atomic_state pointer1049 * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor1050 * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new1051 * state1052 * @__i: int iteration cursor, for macro-internal use1053 *1054 * This iterates over all DRM DP MST topology managers in an atomic update,1055 * tracking only the new state. This is useful in enable functions, where we1056 * need the new state the hardware should be in when the atomic commit1057 * operation has completed.1058 */1059#define for_each_new_mst_mgr_in_state(__state, mgr, new_state, __i) \1060 for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \1061 for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), NULL, &(new_state), (__i)))1062 1063#endif1064