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22 #ifndef _DRM_DP_MST_HELPER_H_
23 #define _DRM_DP_MST_HELPER_H_
25 #include <linux/types.h>
27 #include <drm/drm_dp_helper.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;
91 struct edid *cached_edid; /* for DP logical ports - make tiling work */
96 * struct drm_dp_mst_branch - MST branch device.
97 * @kref: reference count for this port.
98 * @rad: Relative Address to talk to this branch device.
99 * @lct: Link count total to talk to this branch device.
100 * @num_ports: number of ports on the branch.
101 * @msg_slots: one bit per transmitted msg slot.
102 * @ports: linked list of ports on this branch.
103 * @port_parent: pointer to the port parent, NULL if toplevel.
104 * @mgr: topology manager for this branch device.
105 * @tx_slots: transmission slots for this device.
106 * @last_seqno: last sequence number used to talk to this.
107 * @link_address_sent: if a link address message has been sent to this device yet.
108 * @guid: guid for DP 1.2 branch device. port under this branch can be
109 * identified by port #.
111 * This structure represents an MST branch device, there is one
112 * primary branch device at the root, along with any other branches connected
113 * to downstream port of parent branches.
115 struct drm_dp_mst_branch {
122 struct list_head ports;
124 /* list of tx ops queue for this port */
125 struct drm_dp_mst_port *port_parent;
126 struct drm_dp_mst_topology_mgr *mgr;
128 /* slots are protected by mstb->mgr->qlock */
129 struct drm_dp_sideband_msg_tx *tx_slots[2];
131 bool link_address_sent;
133 /* global unique identifier to identify branch devices */
138 /* sideband msg header - not bit struct */
139 struct drm_dp_sideband_msg_hdr {
151 struct drm_dp_nak_reply {
157 struct drm_dp_link_address_ack_reply {
160 struct drm_dp_link_addr_reply_port {
166 bool legacy_device_plug_status;
170 u8 num_sdp_stream_sinks;
174 struct drm_dp_remote_dpcd_read_ack_reply {
180 struct drm_dp_remote_dpcd_write_ack_reply {
184 struct drm_dp_remote_dpcd_write_nak_reply {
187 u8 bytes_written_before_failure;
190 struct drm_dp_remote_i2c_read_ack_reply {
196 struct drm_dp_remote_i2c_read_nak_reply {
199 u8 i2c_nak_transaction;
202 struct drm_dp_remote_i2c_write_ack_reply {
207 struct drm_dp_sideband_msg_rx {
211 u8 curchunk_idx; /* chunk we are parsing now */
213 u8 curlen; /* total length of the msg */
216 struct drm_dp_sideband_msg_hdr initial_hdr;
219 #define DRM_DP_MAX_SDP_STREAMS 16
220 struct drm_dp_allocate_payload {
222 u8 number_sdp_streams;
225 u8 sdp_stream_sink[DRM_DP_MAX_SDP_STREAMS];
228 struct drm_dp_allocate_payload_ack_reply {
234 struct drm_dp_connection_status_notify {
237 bool legacy_device_plug_status;
238 bool displayport_device_plug_status;
239 bool message_capability_status;
244 struct drm_dp_remote_dpcd_read {
250 struct drm_dp_remote_dpcd_write {
257 #define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4
258 struct drm_dp_remote_i2c_read {
266 u8 i2c_transaction_delay;
267 } transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS];
268 u8 read_i2c_device_id;
272 struct drm_dp_remote_i2c_write {
274 u8 write_i2c_device_id;
279 /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
280 struct drm_dp_port_number_req {
284 struct drm_dp_enum_path_resources_ack_reply {
286 u16 full_payload_bw_number;
287 u16 avail_payload_bw_number;
290 /* covers POWER_DOWN_PHY, POWER_UP_PHY */
291 struct drm_dp_port_number_rep {
295 struct drm_dp_query_payload {
300 struct drm_dp_resource_status_notify {
306 struct drm_dp_query_payload_ack_reply {
311 struct drm_dp_sideband_msg_req_body {
314 struct drm_dp_connection_status_notify conn_stat;
315 struct drm_dp_port_number_req port_num;
316 struct drm_dp_resource_status_notify resource_stat;
318 struct drm_dp_query_payload query_payload;
319 struct drm_dp_allocate_payload allocate_payload;
321 struct drm_dp_remote_dpcd_read dpcd_read;
322 struct drm_dp_remote_dpcd_write dpcd_write;
324 struct drm_dp_remote_i2c_read i2c_read;
325 struct drm_dp_remote_i2c_write i2c_write;
329 struct drm_dp_sideband_msg_reply_body {
333 struct drm_dp_nak_reply nak;
334 struct drm_dp_link_address_ack_reply link_addr;
335 struct drm_dp_port_number_rep port_number;
337 struct drm_dp_enum_path_resources_ack_reply path_resources;
338 struct drm_dp_allocate_payload_ack_reply allocate_payload;
339 struct drm_dp_query_payload_ack_reply query_payload;
341 struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;
342 struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;
343 struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;
345 struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
346 struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
347 struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
351 /* msg is queued to be put into a slot */
352 #define DRM_DP_SIDEBAND_TX_QUEUED 0
353 /* msg has started transmitting on a slot - still on msgq */
354 #define DRM_DP_SIDEBAND_TX_START_SEND 1
355 /* msg has finished transmitting on a slot - removed from msgq only in slot */
356 #define DRM_DP_SIDEBAND_TX_SENT 2
357 /* msg has received a response - removed from slot */
358 #define DRM_DP_SIDEBAND_TX_RX 3
359 #define DRM_DP_SIDEBAND_TX_TIMEOUT 4
361 struct drm_dp_sideband_msg_tx {
366 struct drm_dp_mst_branch *dst;
367 struct list_head next;
371 struct drm_dp_sideband_msg_reply_body reply;
374 /* sideband msg handler */
375 struct drm_dp_mst_topology_mgr;
376 struct drm_dp_mst_topology_cbs {
377 /* create a connector for a port */
378 struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path);
379 void (*register_connector)(struct drm_connector *connector);
380 void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr,
381 struct drm_connector *connector);
382 void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr);
386 #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)
388 #define DP_PAYLOAD_LOCAL 1
389 #define DP_PAYLOAD_REMOTE 2
390 #define DP_PAYLOAD_DELETE_LOCAL 3
392 struct drm_dp_payload {
400 * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
401 * @dev: device pointer for adding i2c devices etc.
402 * @cbs: callbacks for connector addition and destruction.
403 * @max_dpcd_transaction_bytes - maximum number of bytes to read/write in one go.
404 * @aux: aux channel for the DP connector.
405 * @max_payloads: maximum number of payloads the GPU can generate.
406 * @conn_base_id: DRM connector ID this mgr is connected to.
407 * @down_rep_recv: msg receiver state for down replies.
408 * @up_req_recv: msg receiver state for up requests.
409 * @lock: protects mst state, primary, dpcd.
410 * @mst_state: if this manager is enabled for an MST capable port.
411 * @mst_primary: pointer to the primary branch device.
412 * @dpcd: cache of DPCD for primary port.
413 * @pbn_div: PBN to slots divisor.
415 * This struct represents the toplevel displayport MST topology manager.
416 * There should be one instance of this for every MST capable DP connector
419 struct drm_dp_mst_topology_mgr {
422 const struct drm_dp_mst_topology_cbs *cbs;
423 int max_dpcd_transaction_bytes;
424 struct drm_dp_aux *aux; /* auxch for this topology mgr to use */
428 /* only ever accessed from the workqueue - which should be serialised */
429 struct drm_dp_sideband_msg_rx down_rep_recv;
430 struct drm_dp_sideband_msg_rx up_req_recv;
432 /* pointer to info about the initial MST device */
433 struct lock lock; /* protects mst_state + primary + dpcd */
436 struct drm_dp_mst_branch *mst_primary;
438 u8 dpcd[DP_RECEIVER_CAP_SIZE];
445 /* messages to be transmitted */
446 /* qlock protects the upq/downq and in_progress,
447 the mstb tx_slots and txmsg->state once they are queued */
449 struct list_head tx_msg_downq;
450 bool tx_down_in_progress;
452 /* payload info + lock for it */
453 struct lock payload_lock;
454 struct drm_dp_vcpi **proposed_vcpis;
455 struct drm_dp_payload *payloads;
456 unsigned long payload_mask;
457 unsigned long vcpi_mask;
459 wait_queue_head_t tx_waitq;
460 struct work_struct work;
462 struct work_struct tx_work;
464 struct list_head destroy_connector_list;
465 struct lock destroy_connector_lock;
466 struct work_struct destroy_connector_work;
469 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, struct device *dev, struct drm_dp_aux *aux, int max_dpcd_transaction_bytes, int max_payloads, int conn_base_id);
471 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
474 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);
477 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);
480 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);
482 bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr,
483 struct drm_dp_mst_port *port);
484 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
487 int drm_dp_calc_pbn_mode(int clock, int bpp);
490 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots);
492 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
495 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
498 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
499 struct drm_dp_mst_port *port);
502 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
506 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);
509 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);
511 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);
513 void drm_dp_mst_dump_topology(struct seq_file *m,
514 struct drm_dp_mst_topology_mgr *mgr);
516 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
517 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);