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  1. /*
  2.  * Copyright © 2014 Red Hat.
  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. #ifndef _DRM_DP_MST_HELPER_H_
  23. #define _DRM_DP_MST_HELPER_H_
  24.  
  25. #include <linux/types.h>
  26. #include <drm/drm_dp_helper.h>
  27.  
  28. struct drm_dp_mst_branch;
  29.  
  30. /**
  31.  * struct drm_dp_vcpi - Virtual Channel Payload Identifer
  32.  * @vcpi: Virtual channel ID.
  33.  * @pbn: Payload Bandwidth Number for this channel
  34.  * @aligned_pbn: PBN aligned with slot size
  35.  * @num_slots: number of slots for this PBN
  36.  */
  37. struct drm_dp_vcpi {
  38.         int vcpi;
  39.         int pbn;
  40.         int aligned_pbn;
  41.         int num_slots;
  42. };
  43.  
  44. /**
  45.  * struct drm_dp_mst_port - MST port
  46.  * @kref: reference count for this port.
  47.  * @guid_valid: for DP 1.2 devices if we have validated the GUID.
  48.  * @guid: guid for DP 1.2 device on this port.
  49.  * @port_num: port number
  50.  * @input: if this port is an input port.
  51.  * @mcs: message capability status - DP 1.2 spec.
  52.  * @ddps: DisplayPort Device Plug Status - DP 1.2
  53.  * @pdt: Peer Device Type
  54.  * @ldps: Legacy Device Plug Status
  55.  * @dpcd_rev: DPCD revision of device on this port
  56.  * @num_sdp_streams: Number of simultaneous streams
  57.  * @num_sdp_stream_sinks: Number of stream sinks
  58.  * @available_pbn: Available bandwidth for this port.
  59.  * @next: link to next port on this branch device
  60.  * @mstb: branch device attach below this port
  61.  * @aux: i2c aux transport to talk to device connected to this port.
  62.  * @parent: branch device parent of this port
  63.  * @vcpi: Virtual Channel Payload info for this port.
  64.  * @connector: DRM connector this port is connected to.
  65.  * @mgr: topology manager this port lives under.
  66.  *
  67.  * This structure represents an MST port endpoint on a device somewhere
  68.  * in the MST topology.
  69.  */
  70. struct drm_dp_mst_port {
  71.         struct kref kref;
  72.  
  73.         /* if dpcd 1.2 device is on this port - its GUID info */
  74.         bool guid_valid;
  75.         u8 guid[16];
  76.  
  77.         u8 port_num;
  78.         bool input;
  79.         bool mcs;
  80.         bool ddps;
  81.         u8 pdt;
  82.         bool ldps;
  83.         u8 dpcd_rev;
  84.         u8 num_sdp_streams;
  85.         u8 num_sdp_stream_sinks;
  86.         uint16_t available_pbn;
  87.         struct list_head next;
  88.         struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port has one */
  89.         struct drm_dp_aux aux; /* i2c bus for this port? */
  90.         struct drm_dp_mst_branch *parent;
  91.  
  92.         struct drm_dp_vcpi vcpi;
  93.         struct drm_connector *connector;
  94.         struct drm_dp_mst_topology_mgr *mgr;
  95. };
  96.  
  97. /**
  98.  * struct drm_dp_mst_branch - MST branch device.
  99.  * @kref: reference count for this port.
  100.  * @rad: Relative Address to talk to this branch device.
  101.  * @lct: Link count total to talk to this branch device.
  102.  * @num_ports: number of ports on the branch.
  103.  * @msg_slots: one bit per transmitted msg slot.
  104.  * @ports: linked list of ports on this branch.
  105.  * @port_parent: pointer to the port parent, NULL if toplevel.
  106.  * @mgr: topology manager for this branch device.
  107.  * @tx_slots: transmission slots for this device.
  108.  * @last_seqno: last sequence number used to talk to this.
  109.  * @link_address_sent: if a link address message has been sent to this device yet.
  110.  *
  111.  * This structure represents an MST branch device, there is one
  112.  * primary branch device at the root, along with any others connected
  113.  * to downstream ports
  114.  */
  115. struct drm_dp_mst_branch {
  116.         struct kref kref;
  117.         u8 rad[8];
  118.         u8 lct;
  119.         int num_ports;
  120.  
  121.         int msg_slots;
  122.         struct list_head ports;
  123.  
  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;
  127.  
  128.         /* slots are protected by mstb->mgr->qlock */
  129.         struct drm_dp_sideband_msg_tx *tx_slots[2];
  130.         int last_seqno;
  131.         bool link_address_sent;
  132. };
  133.  
  134.  
  135. /* sideband msg header - not bit struct */
  136. struct drm_dp_sideband_msg_hdr {
  137.         u8 lct;
  138.         u8 lcr;
  139.         u8 rad[8];
  140.         bool broadcast;
  141.         bool path_msg;
  142.         u8 msg_len;
  143.         bool somt;
  144.         bool eomt;
  145.         bool seqno;
  146. };
  147.  
  148. struct drm_dp_nak_reply {
  149.         u8 guid[16];
  150.         u8 reason;
  151.         u8 nak_data;
  152. };
  153.  
  154. struct drm_dp_link_address_ack_reply {
  155.         u8 guid[16];
  156.         u8 nports;
  157.         struct drm_dp_link_addr_reply_port {
  158.                 bool input_port;
  159.                 u8 peer_device_type;
  160.                 u8 port_number;
  161.                 bool mcs;
  162.                 bool ddps;
  163.                 bool legacy_device_plug_status;
  164.                 u8 dpcd_revision;
  165.                 u8 peer_guid[16];
  166.                 u8 num_sdp_streams;
  167.                 u8 num_sdp_stream_sinks;
  168.         } ports[16];
  169. };
  170.  
  171. struct drm_dp_remote_dpcd_read_ack_reply {
  172.         u8 port_number;
  173.         u8 num_bytes;
  174.         u8 bytes[255];
  175. };
  176.  
  177. struct drm_dp_remote_dpcd_write_ack_reply {
  178.         u8 port_number;
  179. };
  180.  
  181. struct drm_dp_remote_dpcd_write_nak_reply {
  182.         u8 port_number;
  183.         u8 reason;
  184.         u8 bytes_written_before_failure;
  185. };
  186.  
  187. struct drm_dp_remote_i2c_read_ack_reply {
  188.         u8 port_number;
  189.         u8 num_bytes;
  190.         u8 bytes[255];
  191. };
  192.  
  193. struct drm_dp_remote_i2c_read_nak_reply {
  194.         u8 port_number;
  195.         u8 nak_reason;
  196.         u8 i2c_nak_transaction;
  197. };
  198.  
  199. struct drm_dp_remote_i2c_write_ack_reply {
  200.         u8 port_number;
  201. };
  202.  
  203.  
  204. struct drm_dp_sideband_msg_rx {
  205.         u8 chunk[48];
  206.         u8 msg[256];
  207.         u8 curchunk_len;
  208.         u8 curchunk_idx; /* chunk we are parsing now */
  209.         u8 curchunk_hdrlen;
  210.         u8 curlen; /* total length of the msg */
  211.         bool have_somt;
  212.         bool have_eomt;
  213.         struct drm_dp_sideband_msg_hdr initial_hdr;
  214. };
  215.  
  216.  
  217. struct drm_dp_allocate_payload {
  218.         u8 port_number;
  219.         u8 number_sdp_streams;
  220.         u8 vcpi;
  221.         u16 pbn;
  222.         u8 sdp_stream_sink[8];
  223. };
  224.  
  225. struct drm_dp_allocate_payload_ack_reply {
  226.         u8 port_number;
  227.         u8 vcpi;
  228.         u16 allocated_pbn;
  229. };
  230.  
  231. struct drm_dp_connection_status_notify {
  232.         u8 guid[16];
  233.         u8 port_number;
  234.         bool legacy_device_plug_status;
  235.         bool displayport_device_plug_status;
  236.         bool message_capability_status;
  237.         bool input_port;
  238.         u8 peer_device_type;
  239. };
  240.  
  241. struct drm_dp_remote_dpcd_read {
  242.         u8 port_number;
  243.         u32 dpcd_address;
  244.         u8 num_bytes;
  245. };
  246.  
  247. struct drm_dp_remote_dpcd_write {
  248.         u8 port_number;
  249.         u32 dpcd_address;
  250.         u8 num_bytes;
  251.         u8 *bytes;
  252. };
  253.  
  254. struct drm_dp_remote_i2c_read {
  255.         u8 num_transactions;
  256.         u8 port_number;
  257.         struct {
  258.                 u8 i2c_dev_id;
  259.                 u8 num_bytes;
  260.                 u8 *bytes;
  261.                 u8 no_stop_bit;
  262.                 u8 i2c_transaction_delay;
  263.         } transactions[4];
  264.         u8 read_i2c_device_id;
  265.         u8 num_bytes_read;
  266. };
  267.  
  268. struct drm_dp_remote_i2c_write {
  269.         u8 port_number;
  270.         u8 write_i2c_device_id;
  271.         u8 num_bytes;
  272.         u8 *bytes;
  273. };
  274.  
  275. /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
  276. struct drm_dp_port_number_req {
  277.         u8 port_number;
  278. };
  279.  
  280. struct drm_dp_enum_path_resources_ack_reply {
  281.         u8 port_number;
  282.         u16 full_payload_bw_number;
  283.         u16 avail_payload_bw_number;
  284. };
  285.  
  286. /* covers POWER_DOWN_PHY, POWER_UP_PHY */
  287. struct drm_dp_port_number_rep {
  288.         u8 port_number;
  289. };
  290.  
  291. struct drm_dp_query_payload {
  292.         u8 port_number;
  293.         u8 vcpi;
  294. };
  295.  
  296. struct drm_dp_resource_status_notify {
  297.         u8 port_number;
  298.         u8 guid[16];
  299.         u16 available_pbn;
  300. };
  301.  
  302. struct drm_dp_query_payload_ack_reply {
  303.         u8 port_number;
  304.         u8 allocated_pbn;
  305. };
  306.  
  307. struct drm_dp_sideband_msg_req_body {
  308.         u8 req_type;
  309.         union ack_req {
  310.                 struct drm_dp_connection_status_notify conn_stat;
  311.                 struct drm_dp_port_number_req port_num;
  312.                 struct drm_dp_resource_status_notify resource_stat;
  313.  
  314.                 struct drm_dp_query_payload query_payload;
  315.                 struct drm_dp_allocate_payload allocate_payload;
  316.  
  317.                 struct drm_dp_remote_dpcd_read dpcd_read;
  318.                 struct drm_dp_remote_dpcd_write dpcd_write;
  319.  
  320.                 struct drm_dp_remote_i2c_read i2c_read;
  321.                 struct drm_dp_remote_i2c_write i2c_write;
  322.         } u;
  323. };
  324.  
  325. struct drm_dp_sideband_msg_reply_body {
  326.         u8 reply_type;
  327.         u8 req_type;
  328.         union ack_replies {
  329.                 struct drm_dp_nak_reply nak;
  330.                 struct drm_dp_link_address_ack_reply link_addr;
  331.                 struct drm_dp_port_number_rep port_number;
  332.  
  333.                 struct drm_dp_enum_path_resources_ack_reply path_resources;
  334.                 struct drm_dp_allocate_payload_ack_reply allocate_payload;
  335.                 struct drm_dp_query_payload_ack_reply query_payload;
  336.  
  337.                 struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;
  338.                 struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;
  339.                 struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;
  340.  
  341.                 struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
  342.                 struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
  343.                 struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
  344.         } u;
  345. };
  346.  
  347. /* msg is queued to be put into a slot */
  348. #define DRM_DP_SIDEBAND_TX_QUEUED 0
  349. /* msg has started transmitting on a slot - still on msgq */
  350. #define DRM_DP_SIDEBAND_TX_START_SEND 1
  351. /* msg has finished transmitting on a slot - removed from msgq only in slot */
  352. #define DRM_DP_SIDEBAND_TX_SENT 2
  353. /* msg has received a response - removed from slot */
  354. #define DRM_DP_SIDEBAND_TX_RX 3
  355. #define DRM_DP_SIDEBAND_TX_TIMEOUT 4
  356.  
  357. struct drm_dp_sideband_msg_tx {
  358.         u8 msg[256];
  359.         u8 chunk[48];
  360.         u8 cur_offset;
  361.         u8 cur_len;
  362.         struct drm_dp_mst_branch *dst;
  363.         struct list_head next;
  364.         int seqno;
  365.         int state;
  366.         bool path_msg;
  367.         struct drm_dp_sideband_msg_reply_body reply;
  368. };
  369.  
  370. /* sideband msg handler */
  371. struct drm_dp_mst_topology_mgr;
  372. struct drm_dp_mst_topology_cbs {
  373.         /* create a connector for a port */
  374.         struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, char *path);
  375.         void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr,
  376.                                   struct drm_connector *connector);
  377.         void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr);
  378.  
  379. };
  380.  
  381. #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)
  382.  
  383. #define DP_PAYLOAD_LOCAL 1
  384. #define DP_PAYLOAD_REMOTE 2
  385. #define DP_PAYLOAD_DELETE_LOCAL 3
  386.  
  387. struct drm_dp_payload {
  388.         int payload_state;
  389.         int start_slot;
  390.         int num_slots;
  391. };
  392.  
  393. /**
  394.  * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
  395.  * @dev: device pointer for adding i2c devices etc.
  396.  * @cbs: callbacks for connector addition and destruction.
  397.  * @max_dpcd_transaction_bytes - maximum number of bytes to read/write in one go.
  398.  * @aux: aux channel for the DP connector.
  399.  * @max_payloads: maximum number of payloads the GPU can generate.
  400.  * @conn_base_id: DRM connector ID this mgr is connected to.
  401.  * @down_rep_recv: msg receiver state for down replies.
  402.  * @up_req_recv: msg receiver state for up requests.
  403.  * @lock: protects mst state, primary, guid, dpcd.
  404.  * @mst_state: if this manager is enabled for an MST capable port.
  405.  * @mst_primary: pointer to the primary branch device.
  406.  * @guid_valid: GUID valid for the primary branch device.
  407.  * @guid: GUID for primary port.
  408.  * @dpcd: cache of DPCD for primary port.
  409.  * @pbn_div: PBN to slots divisor.
  410.  *
  411.  * This struct represents the toplevel displayport MST topology manager.
  412.  * There should be one instance of this for every MST capable DP connector
  413.  * on the GPU.
  414.  */
  415. struct drm_dp_mst_topology_mgr {
  416.  
  417.         struct device *dev;
  418.         struct drm_dp_mst_topology_cbs *cbs;
  419.         int max_dpcd_transaction_bytes;
  420.         struct drm_dp_aux *aux; /* auxch for this topology mgr to use */
  421.         int max_payloads;
  422.         int conn_base_id;
  423.  
  424.         /* only ever accessed from the workqueue - which should be serialised */
  425.         struct drm_dp_sideband_msg_rx down_rep_recv;
  426.         struct drm_dp_sideband_msg_rx up_req_recv;
  427.  
  428.         /* pointer to info about the initial MST device */
  429.         struct mutex lock; /* protects mst_state + primary + guid + dpcd */
  430.  
  431.         bool mst_state;
  432.         struct drm_dp_mst_branch *mst_primary;
  433.         /* primary MST device GUID */
  434.         bool guid_valid;
  435.         u8 guid[16];
  436.         u8 dpcd[DP_RECEIVER_CAP_SIZE];
  437.         u8 sink_count;
  438.         int pbn_div;
  439.         int total_slots;
  440.         int avail_slots;
  441.         int total_pbn;
  442.  
  443.         /* messages to be transmitted */
  444.         /* qlock protects the upq/downq and in_progress,
  445.            the mstb tx_slots and txmsg->state once they are queued */
  446.     struct mutex qlock;
  447.         struct list_head tx_msg_downq;
  448.         struct list_head tx_msg_upq;
  449.         bool tx_down_in_progress;
  450.         bool tx_up_in_progress;
  451.  
  452.         /* payload info + lock for it */
  453.         struct mutex payload_lock;
  454.         struct drm_dp_vcpi **proposed_vcpis;
  455.         struct drm_dp_payload *payloads;
  456.         unsigned long payload_mask;
  457.  
  458.         wait_queue_head_t tx_waitq;
  459.         struct work_struct work;
  460.  
  461.         struct work_struct tx_work;
  462. };
  463.  
  464. 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);
  465.  
  466. void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
  467.  
  468.  
  469. int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);
  470.  
  471.  
  472. int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);
  473.  
  474.  
  475. enum drm_connector_status drm_dp_mst_detect_port(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
  476.  
  477. struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
  478.  
  479.  
  480. int drm_dp_calc_pbn_mode(int clock, int bpp);
  481.  
  482.  
  483. bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots);
  484.  
  485.  
  486. void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
  487.  
  488.  
  489. void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
  490.                                 struct drm_dp_mst_port *port);
  491.  
  492.  
  493. int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
  494.                            int pbn);
  495.  
  496.  
  497. int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);
  498.  
  499.  
  500. int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);
  501.  
  502. int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);
  503.  
  504. void drm_dp_mst_dump_topology(struct seq_file *m,
  505.                               struct drm_dp_mst_topology_mgr *mgr);
  506.  
  507. void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
  508. int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
  509. #endif
  510.