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22 #ifndef _DRM_DP_MST_HELPER_H_
23 #define _DRM_DP_MST_HELPER_H_
25 #include <linux/types.h>
26 #include <drm/drm_dp_helper.h>
27 #include <drm/drm_atomic.h>
29 struct drm_dp_mst_branch;
32 * struct drm_dp_vcpi - Virtual Channel Payload Identifier
33 * @vcpi: Virtual channel ID.
34 * @pbn: Payload Bandwidth Number for this channel
35 * @aligned_pbn: PBN aligned with slot size
36 * @num_slots: number of slots for this PBN
46 * struct drm_dp_mst_port - MST port
47 * @kref: reference count for this port.
48 * @port_num: port number
49 * @input: if this port is an input port.
50 * @mcs: message capability status - DP 1.2 spec.
51 * @ddps: DisplayPort Device Plug Status - DP 1.2
52 * @pdt: Peer Device Type
53 * @ldps: Legacy Device Plug Status
54 * @dpcd_rev: DPCD revision of device on this port
55 * @num_sdp_streams: Number of simultaneous streams
56 * @num_sdp_stream_sinks: Number of stream sinks
57 * @available_pbn: Available bandwidth for this port.
58 * @next: link to next port on this branch device
59 * @mstb: branch device attach below this port
60 * @aux: i2c aux transport to talk to device connected to this port.
61 * @parent: branch device parent of this port
62 * @vcpi: Virtual Channel Payload info for this port.
63 * @connector: DRM connector this port is connected to.
64 * @mgr: topology manager this port lives under.
66 * This structure represents an MST port endpoint on a device somewhere
67 * in the MST topology.
69 struct drm_dp_mst_port {
80 u8 num_sdp_stream_sinks;
81 uint16_t available_pbn;
82 struct list_head next;
83 struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port has one */
84 struct drm_dp_aux aux; /* i2c bus for this port? */
85 struct drm_dp_mst_branch *parent;
87 struct drm_dp_vcpi vcpi;
88 struct drm_connector *connector;
89 struct drm_dp_mst_topology_mgr *mgr;
92 * @cached_edid: for DP logical ports - make tiling work by ensuring
93 * that the EDID for all connectors is read immediately.
95 struct edid *cached_edid;
97 * @has_audio: Tracks whether the sink connector to this port is
104 * struct drm_dp_mst_branch - MST branch device.
105 * @kref: reference count for this port.
106 * @rad: Relative Address to talk to this branch device.
107 * @lct: Link count total to talk to this branch device.
108 * @num_ports: number of ports on the branch.
109 * @msg_slots: one bit per transmitted msg slot.
110 * @ports: linked list of ports on this branch.
111 * @port_parent: pointer to the port parent, NULL if toplevel.
112 * @mgr: topology manager for this branch device.
113 * @tx_slots: transmission slots for this device.
114 * @last_seqno: last sequence number used to talk to this.
115 * @link_address_sent: if a link address message has been sent to this device yet.
116 * @guid: guid for DP 1.2 branch device. port under this branch can be
117 * identified by port #.
119 * This structure represents an MST branch device, there is one
120 * primary branch device at the root, along with any other branches connected
121 * to downstream port of parent branches.
123 struct drm_dp_mst_branch {
130 struct list_head ports;
132 /* list of tx ops queue for this port */
133 struct drm_dp_mst_port *port_parent;
134 struct drm_dp_mst_topology_mgr *mgr;
136 /* slots are protected by mstb->mgr->qlock */
137 struct drm_dp_sideband_msg_tx *tx_slots[2];
139 bool link_address_sent;
141 /* global unique identifier to identify branch devices */
146 /* sideband msg header - not bit struct */
147 struct drm_dp_sideband_msg_hdr {
159 struct drm_dp_nak_reply {
165 struct drm_dp_link_address_ack_reply {
168 struct drm_dp_link_addr_reply_port {
174 bool legacy_device_plug_status;
178 u8 num_sdp_stream_sinks;
182 struct drm_dp_remote_dpcd_read_ack_reply {
188 struct drm_dp_remote_dpcd_write_ack_reply {
192 struct drm_dp_remote_dpcd_write_nak_reply {
195 u8 bytes_written_before_failure;
198 struct drm_dp_remote_i2c_read_ack_reply {
204 struct drm_dp_remote_i2c_read_nak_reply {
207 u8 i2c_nak_transaction;
210 struct drm_dp_remote_i2c_write_ack_reply {
215 struct drm_dp_sideband_msg_rx {
219 u8 curchunk_idx; /* chunk we are parsing now */
221 u8 curlen; /* total length of the msg */
224 struct drm_dp_sideband_msg_hdr initial_hdr;
227 #define DRM_DP_MAX_SDP_STREAMS 16
228 struct drm_dp_allocate_payload {
230 u8 number_sdp_streams;
233 u8 sdp_stream_sink[DRM_DP_MAX_SDP_STREAMS];
236 struct drm_dp_allocate_payload_ack_reply {
242 struct drm_dp_connection_status_notify {
245 bool legacy_device_plug_status;
246 bool displayport_device_plug_status;
247 bool message_capability_status;
252 struct drm_dp_remote_dpcd_read {
258 struct drm_dp_remote_dpcd_write {
265 #define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4
266 struct drm_dp_remote_i2c_read {
274 u8 i2c_transaction_delay;
275 } transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS];
276 u8 read_i2c_device_id;
280 struct drm_dp_remote_i2c_write {
282 u8 write_i2c_device_id;
287 /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
288 struct drm_dp_port_number_req {
292 struct drm_dp_enum_path_resources_ack_reply {
294 u16 full_payload_bw_number;
295 u16 avail_payload_bw_number;
298 /* covers POWER_DOWN_PHY, POWER_UP_PHY */
299 struct drm_dp_port_number_rep {
303 struct drm_dp_query_payload {
308 struct drm_dp_resource_status_notify {
314 struct drm_dp_query_payload_ack_reply {
319 struct drm_dp_sideband_msg_req_body {
322 struct drm_dp_connection_status_notify conn_stat;
323 struct drm_dp_port_number_req port_num;
324 struct drm_dp_resource_status_notify resource_stat;
326 struct drm_dp_query_payload query_payload;
327 struct drm_dp_allocate_payload allocate_payload;
329 struct drm_dp_remote_dpcd_read dpcd_read;
330 struct drm_dp_remote_dpcd_write dpcd_write;
332 struct drm_dp_remote_i2c_read i2c_read;
333 struct drm_dp_remote_i2c_write i2c_write;
337 struct drm_dp_sideband_msg_reply_body {
341 struct drm_dp_nak_reply nak;
342 struct drm_dp_link_address_ack_reply link_addr;
343 struct drm_dp_port_number_rep port_number;
345 struct drm_dp_enum_path_resources_ack_reply path_resources;
346 struct drm_dp_allocate_payload_ack_reply allocate_payload;
347 struct drm_dp_query_payload_ack_reply query_payload;
349 struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;
350 struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;
351 struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;
353 struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
354 struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
355 struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
359 /* msg is queued to be put into a slot */
360 #define DRM_DP_SIDEBAND_TX_QUEUED 0
361 /* msg has started transmitting on a slot - still on msgq */
362 #define DRM_DP_SIDEBAND_TX_START_SEND 1
363 /* msg has finished transmitting on a slot - removed from msgq only in slot */
364 #define DRM_DP_SIDEBAND_TX_SENT 2
365 /* msg has received a response - removed from slot */
366 #define DRM_DP_SIDEBAND_TX_RX 3
367 #define DRM_DP_SIDEBAND_TX_TIMEOUT 4
369 struct drm_dp_sideband_msg_tx {
374 struct drm_dp_mst_branch *dst;
375 struct list_head next;
379 struct drm_dp_sideband_msg_reply_body reply;
382 /* sideband msg handler */
383 struct drm_dp_mst_topology_mgr;
384 struct drm_dp_mst_topology_cbs {
385 /* create a connector for a port */
386 struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path);
387 void (*register_connector)(struct drm_connector *connector);
388 void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr,
389 struct drm_connector *connector);
390 void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr);
394 #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)
396 #define DP_PAYLOAD_LOCAL 1
397 #define DP_PAYLOAD_REMOTE 2
398 #define DP_PAYLOAD_DELETE_LOCAL 3
400 struct drm_dp_payload {
407 #define to_dp_mst_topology_state(x) container_of(x, struct drm_dp_mst_topology_state, base)
409 struct drm_dp_mst_topology_state {
410 struct drm_private_state base;
412 struct drm_atomic_state *state;
413 struct drm_dp_mst_topology_mgr *mgr;
416 #define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base)
419 * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
421 * This struct represents the toplevel displayport MST topology manager.
422 * There should be one instance of this for every MST capable DP connector
425 struct drm_dp_mst_topology_mgr {
427 * @base: Base private object for atomic
429 struct drm_private_obj base;
432 * @dev: device pointer for adding i2c devices etc.
434 struct drm_device *dev;
436 * @cbs: callbacks for connector addition and destruction.
438 const struct drm_dp_mst_topology_cbs *cbs;
440 * @max_dpcd_transaction_bytes: maximum number of bytes to read/write
443 int max_dpcd_transaction_bytes;
445 * @aux: AUX channel for the DP MST connector this topolgy mgr is
448 struct drm_dp_aux *aux;
450 * @max_payloads: maximum number of payloads the GPU can generate.
454 * @conn_base_id: DRM connector ID this mgr is connected to. Only used
455 * to build the MST connector path value.
460 * @down_rep_recv: Message receiver state for down replies. This and
461 * @up_req_recv are only ever access from the work item, which is
464 struct drm_dp_sideband_msg_rx down_rep_recv;
466 * @up_req_recv: Message receiver state for up requests. This and
467 * @down_rep_recv are only ever access from the work item, which is
470 struct drm_dp_sideband_msg_rx up_req_recv;
473 * @lock: protects mst state, primary, dpcd.
478 * @mst_state: If this manager is enabled for an MST capable port. False
479 * if no MST sink/branch devices is connected.
483 * @mst_primary: Pointer to the primary/first branch device.
485 struct drm_dp_mst_branch *mst_primary;
488 * @dpcd: Cache of DPCD for primary port.
490 u8 dpcd[DP_RECEIVER_CAP_SIZE];
492 * @sink_count: Sink count from DEVICE_SERVICE_IRQ_VECTOR_ESI0.
496 * @pbn_div: PBN to slots divisor.
501 * @state: State information for topology manager
503 struct drm_dp_mst_topology_state *state;
506 * @funcs: Atomic helper callbacks
508 const struct drm_private_state_funcs *funcs;
511 * @qlock: protects @tx_msg_downq, the &drm_dp_mst_branch.txslost and
512 * &drm_dp_sideband_msg_tx.state once they are queued
516 * @tx_msg_downq: List of pending down replies.
518 struct list_head tx_msg_downq;
521 * @payload_lock: Protect payload information.
523 struct mutex payload_lock;
525 * @proposed_vcpis: Array of pointers for the new VCPI allocation. The
526 * VCPI structure itself is &drm_dp_mst_port.vcpi.
528 struct drm_dp_vcpi **proposed_vcpis;
530 * @payloads: Array of payloads.
532 struct drm_dp_payload *payloads;
534 * @payload_mask: Elements of @payloads actually in use. Since
535 * reallocation of active outputs isn't possible gaps can be created by
536 * disabling outputs out of order compared to how they've been enabled.
538 unsigned long payload_mask;
540 * @vcpi_mask: Similar to @payload_mask, but for @proposed_vcpis.
542 unsigned long vcpi_mask;
545 * @tx_waitq: Wait to queue stall for the tx worker.
547 wait_queue_head_t tx_waitq;
551 struct work_struct work;
553 * @tx_work: Sideband transmit worker. This can nest within the main
554 * @work worker for each transaction @work launches.
556 struct work_struct tx_work;
559 * @destroy_connector_list: List of to be destroyed connectors.
561 struct list_head destroy_connector_list;
563 * @destroy_connector_lock: Protects @connector_list.
565 struct mutex destroy_connector_lock;
567 * @destroy_connector_work: Work item to destroy connectors. Needed to
568 * avoid locking inversion.
570 struct work_struct destroy_connector_work;
573 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
574 struct drm_device *dev, struct drm_dp_aux *aux,
575 int max_dpcd_transaction_bytes,
576 int max_payloads, int conn_base_id);
578 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
581 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);
584 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);
587 enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
589 bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
590 struct drm_dp_mst_port *port);
591 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
594 int drm_dp_calc_pbn_mode(int clock, int bpp);
597 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
598 struct drm_dp_mst_port *port, int pbn, int slots);
600 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
603 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
606 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
607 struct drm_dp_mst_port *port);
610 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
614 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);
617 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);
619 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);
621 void drm_dp_mst_dump_topology(struct seq_file *m,
622 struct drm_dp_mst_topology_mgr *mgr);
624 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
625 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
626 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
627 struct drm_dp_mst_topology_mgr *mgr);
628 int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
629 struct drm_dp_mst_topology_mgr *mgr,
630 struct drm_dp_mst_port *port, int pbn);
631 int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
632 struct drm_dp_mst_topology_mgr *mgr,
634 int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
635 struct drm_dp_mst_port *port, bool power_up);