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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 Identifier
  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.  * @port_num: port number
  48.  * @input: if this port is an input port.
  49.  * @mcs: message capability status - DP 1.2 spec.
  50.  * @ddps: DisplayPort Device Plug Status - DP 1.2
  51.  * @pdt: Peer Device Type
  52.  * @ldps: Legacy Device Plug Status
  53.  * @dpcd_rev: DPCD revision of device on this port
  54.  * @num_sdp_streams: Number of simultaneous streams
  55.  * @num_sdp_stream_sinks: Number of stream sinks
  56.  * @available_pbn: Available bandwidth for this port.
  57.  * @next: link to next port on this branch device
  58.  * @mstb: branch device attach below this port
  59.  * @aux: i2c aux transport to talk to device connected to this port.
  60.  * @parent: branch device parent of this port
  61.  * @vcpi: Virtual Channel Payload info for this port.
  62.  * @connector: DRM connector this port is connected to.
  63.  * @mgr: topology manager this port lives under.
  64.  *
  65.  * This structure represents an MST port endpoint on a device somewhere
  66.  * in the MST topology.
  67.  */
  68. struct drm_dp_mst_port {
  69.         struct kref kref;
  70.  
  71.         u8 port_num;
  72.         bool input;
  73.         bool mcs;
  74.         bool ddps;
  75.         u8 pdt;
  76.         bool ldps;
  77.         u8 dpcd_rev;
  78.         u8 num_sdp_streams;
  79.         u8 num_sdp_stream_sinks;
  80.         uint16_t available_pbn;
  81.         struct list_head next;
  82.         struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port has one */
  83.         struct drm_dp_aux aux; /* i2c bus for this port? */
  84.         struct drm_dp_mst_branch *parent;
  85.  
  86.         struct drm_dp_vcpi vcpi;
  87.         struct drm_connector *connector;
  88.         struct drm_dp_mst_topology_mgr *mgr;
  89.  
  90.         struct edid *cached_edid; /* for DP logical ports - make tiling work */
  91. };
  92.  
  93. /**
  94.  * struct drm_dp_mst_branch - MST branch device.
  95.  * @kref: reference count for this port.
  96.  * @rad: Relative Address to talk to this branch device.
  97.  * @lct: Link count total to talk to this branch device.
  98.  * @num_ports: number of ports on the branch.
  99.  * @msg_slots: one bit per transmitted msg slot.
  100.  * @ports: linked list of ports on this branch.
  101.  * @port_parent: pointer to the port parent, NULL if toplevel.
  102.  * @mgr: topology manager for this branch device.
  103.  * @tx_slots: transmission slots for this device.
  104.  * @last_seqno: last sequence number used to talk to this.
  105.  * @link_address_sent: if a link address message has been sent to this device yet.
  106.  * @guid: guid for DP 1.2 branch device. port under this branch can be
  107.  * identified by port #.
  108.  *
  109.  * This structure represents an MST branch device, there is one
  110.  * primary branch device at the root, along with any other branches connected
  111.  * to downstream port of parent branches.
  112.  */
  113. struct drm_dp_mst_branch {
  114.         struct kref kref;
  115.         u8 rad[8];
  116.         u8 lct;
  117.         int num_ports;
  118.  
  119.         int msg_slots;
  120.         struct list_head ports;
  121.  
  122.         /* list of tx ops queue for this port */
  123.         struct drm_dp_mst_port *port_parent;
  124.         struct drm_dp_mst_topology_mgr *mgr;
  125.  
  126.         /* slots are protected by mstb->mgr->qlock */
  127.         struct drm_dp_sideband_msg_tx *tx_slots[2];
  128.         int last_seqno;
  129.         bool link_address_sent;
  130.  
  131.         /* global unique identifier to identify branch devices */
  132.         u8 guid[16];
  133. };
  134.  
  135.  
  136. /* sideband msg header - not bit struct */
  137. struct drm_dp_sideband_msg_hdr {
  138.         u8 lct;
  139.         u8 lcr;
  140.         u8 rad[8];
  141.         bool broadcast;
  142.         bool path_msg;
  143.         u8 msg_len;
  144.         bool somt;
  145.         bool eomt;
  146.         bool seqno;
  147. };
  148.  
  149. struct drm_dp_nak_reply {
  150.         u8 guid[16];
  151.         u8 reason;
  152.         u8 nak_data;
  153. };
  154.  
  155. struct drm_dp_link_address_ack_reply {
  156.         u8 guid[16];
  157.         u8 nports;
  158.         struct drm_dp_link_addr_reply_port {
  159.                 bool input_port;
  160.                 u8 peer_device_type;
  161.                 u8 port_number;
  162.                 bool mcs;
  163.                 bool ddps;
  164.                 bool legacy_device_plug_status;
  165.                 u8 dpcd_revision;
  166.                 u8 peer_guid[16];
  167.                 u8 num_sdp_streams;
  168.                 u8 num_sdp_stream_sinks;
  169.         } ports[16];
  170. };
  171.  
  172. struct drm_dp_remote_dpcd_read_ack_reply {
  173.         u8 port_number;
  174.         u8 num_bytes;
  175.         u8 bytes[255];
  176. };
  177.  
  178. struct drm_dp_remote_dpcd_write_ack_reply {
  179.         u8 port_number;
  180. };
  181.  
  182. struct drm_dp_remote_dpcd_write_nak_reply {
  183.         u8 port_number;
  184.         u8 reason;
  185.         u8 bytes_written_before_failure;
  186. };
  187.  
  188. struct drm_dp_remote_i2c_read_ack_reply {
  189.         u8 port_number;
  190.         u8 num_bytes;
  191.         u8 bytes[255];
  192. };
  193.  
  194. struct drm_dp_remote_i2c_read_nak_reply {
  195.         u8 port_number;
  196.         u8 nak_reason;
  197.         u8 i2c_nak_transaction;
  198. };
  199.  
  200. struct drm_dp_remote_i2c_write_ack_reply {
  201.         u8 port_number;
  202. };
  203.  
  204.  
  205. struct drm_dp_sideband_msg_rx {
  206.         u8 chunk[48];
  207.         u8 msg[256];
  208.         u8 curchunk_len;
  209.         u8 curchunk_idx; /* chunk we are parsing now */
  210.         u8 curchunk_hdrlen;
  211.         u8 curlen; /* total length of the msg */
  212.         bool have_somt;
  213.         bool have_eomt;
  214.         struct drm_dp_sideband_msg_hdr initial_hdr;
  215. };
  216.  
  217.  
  218. struct drm_dp_allocate_payload {
  219.         u8 port_number;
  220.         u8 number_sdp_streams;
  221.         u8 vcpi;
  222.         u16 pbn;
  223.         u8 sdp_stream_sink[8];
  224. };
  225.  
  226. struct drm_dp_allocate_payload_ack_reply {
  227.         u8 port_number;
  228.         u8 vcpi;
  229.         u16 allocated_pbn;
  230. };
  231.  
  232. struct drm_dp_connection_status_notify {
  233.         u8 guid[16];
  234.         u8 port_number;
  235.         bool legacy_device_plug_status;
  236.         bool displayport_device_plug_status;
  237.         bool message_capability_status;
  238.         bool input_port;
  239.         u8 peer_device_type;
  240. };
  241.  
  242. struct drm_dp_remote_dpcd_read {
  243.         u8 port_number;
  244.         u32 dpcd_address;
  245.         u8 num_bytes;
  246. };
  247.  
  248. struct drm_dp_remote_dpcd_write {
  249.         u8 port_number;
  250.         u32 dpcd_address;
  251.         u8 num_bytes;
  252.         u8 *bytes;
  253. };
  254.  
  255. #define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4
  256. struct drm_dp_remote_i2c_read {
  257.         u8 num_transactions;
  258.         u8 port_number;
  259.         struct {
  260.                 u8 i2c_dev_id;
  261.                 u8 num_bytes;
  262.                 u8 *bytes;
  263.                 u8 no_stop_bit;
  264.                 u8 i2c_transaction_delay;
  265.         } transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS];
  266.         u8 read_i2c_device_id;
  267.         u8 num_bytes_read;
  268. };
  269.  
  270. struct drm_dp_remote_i2c_write {
  271.         u8 port_number;
  272.         u8 write_i2c_device_id;
  273.         u8 num_bytes;
  274.         u8 *bytes;
  275. };
  276.  
  277. /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
  278. struct drm_dp_port_number_req {
  279.         u8 port_number;
  280. };
  281.  
  282. struct drm_dp_enum_path_resources_ack_reply {
  283.         u8 port_number;
  284.         u16 full_payload_bw_number;
  285.         u16 avail_payload_bw_number;
  286. };
  287.  
  288. /* covers POWER_DOWN_PHY, POWER_UP_PHY */
  289. struct drm_dp_port_number_rep {
  290.         u8 port_number;
  291. };
  292.  
  293. struct drm_dp_query_payload {
  294.         u8 port_number;
  295.         u8 vcpi;
  296. };
  297.  
  298. struct drm_dp_resource_status_notify {
  299.         u8 port_number;
  300.         u8 guid[16];
  301.         u16 available_pbn;
  302. };
  303.  
  304. struct drm_dp_query_payload_ack_reply {
  305.         u8 port_number;
  306.         u8 allocated_pbn;
  307. };
  308.  
  309. struct drm_dp_sideband_msg_req_body {
  310.         u8 req_type;
  311.         union ack_req {
  312.                 struct drm_dp_connection_status_notify conn_stat;
  313.                 struct drm_dp_port_number_req port_num;
  314.                 struct drm_dp_resource_status_notify resource_stat;
  315.  
  316.                 struct drm_dp_query_payload query_payload;
  317.                 struct drm_dp_allocate_payload allocate_payload;
  318.  
  319.                 struct drm_dp_remote_dpcd_read dpcd_read;
  320.                 struct drm_dp_remote_dpcd_write dpcd_write;
  321.  
  322.                 struct drm_dp_remote_i2c_read i2c_read;
  323.                 struct drm_dp_remote_i2c_write i2c_write;
  324.         } u;
  325. };
  326.  
  327. struct drm_dp_sideband_msg_reply_body {
  328.         u8 reply_type;
  329.         u8 req_type;
  330.         union ack_replies {
  331.                 struct drm_dp_nak_reply nak;
  332.                 struct drm_dp_link_address_ack_reply link_addr;
  333.                 struct drm_dp_port_number_rep port_number;
  334.  
  335.                 struct drm_dp_enum_path_resources_ack_reply path_resources;
  336.                 struct drm_dp_allocate_payload_ack_reply allocate_payload;
  337.                 struct drm_dp_query_payload_ack_reply query_payload;
  338.  
  339.                 struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;
  340.                 struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;
  341.                 struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;
  342.  
  343.                 struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
  344.                 struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
  345.                 struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
  346.         } u;
  347. };
  348.  
  349. /* msg is queued to be put into a slot */
  350. #define DRM_DP_SIDEBAND_TX_QUEUED 0
  351. /* msg has started transmitting on a slot - still on msgq */
  352. #define DRM_DP_SIDEBAND_TX_START_SEND 1
  353. /* msg has finished transmitting on a slot - removed from msgq only in slot */
  354. #define DRM_DP_SIDEBAND_TX_SENT 2
  355. /* msg has received a response - removed from slot */
  356. #define DRM_DP_SIDEBAND_TX_RX 3
  357. #define DRM_DP_SIDEBAND_TX_TIMEOUT 4
  358.  
  359. struct drm_dp_sideband_msg_tx {
  360.         u8 msg[256];
  361.         u8 chunk[48];
  362.         u8 cur_offset;
  363.         u8 cur_len;
  364.         struct drm_dp_mst_branch *dst;
  365.         struct list_head next;
  366.         int seqno;
  367.         int state;
  368.         bool path_msg;
  369.         struct drm_dp_sideband_msg_reply_body reply;
  370. };
  371.  
  372. /* sideband msg handler */
  373. struct drm_dp_mst_topology_mgr;
  374. struct drm_dp_mst_topology_cbs {
  375.         /* create a connector for a port */
  376.         struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path);
  377.         void (*register_connector)(struct drm_connector *connector);
  378.         void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr,
  379.                                   struct drm_connector *connector);
  380.         void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr);
  381.  
  382. };
  383.  
  384. #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)
  385.  
  386. #define DP_PAYLOAD_LOCAL 1
  387. #define DP_PAYLOAD_REMOTE 2
  388. #define DP_PAYLOAD_DELETE_LOCAL 3
  389.  
  390. struct drm_dp_payload {
  391.         int payload_state;
  392.         int start_slot;
  393.         int num_slots;
  394.         int vcpi;
  395. };
  396.  
  397. /**
  398.  * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
  399.  * @dev: device pointer for adding i2c devices etc.
  400.  * @cbs: callbacks for connector addition and destruction.
  401.  * @max_dpcd_transaction_bytes - maximum number of bytes to read/write in one go.
  402.  * @aux: aux channel for the DP connector.
  403.  * @max_payloads: maximum number of payloads the GPU can generate.
  404.  * @conn_base_id: DRM connector ID this mgr is connected to.
  405.  * @down_rep_recv: msg receiver state for down replies.
  406.  * @up_req_recv: msg receiver state for up requests.
  407.  * @lock: protects mst state, primary, dpcd.
  408.  * @mst_state: if this manager is enabled for an MST capable port.
  409.  * @mst_primary: pointer to the primary branch device.
  410.  * @dpcd: cache of DPCD for primary port.
  411.  * @pbn_div: PBN to slots divisor.
  412.  *
  413.  * This struct represents the toplevel displayport MST topology manager.
  414.  * There should be one instance of this for every MST capable DP connector
  415.  * on the GPU.
  416.  */
  417. struct drm_dp_mst_topology_mgr {
  418.  
  419.         struct device *dev;
  420.         struct drm_dp_mst_topology_cbs *cbs;
  421.         int max_dpcd_transaction_bytes;
  422.         struct drm_dp_aux *aux; /* auxch for this topology mgr to use */
  423.         int max_payloads;
  424.         int conn_base_id;
  425.  
  426.         /* only ever accessed from the workqueue - which should be serialised */
  427.         struct drm_dp_sideband_msg_rx down_rep_recv;
  428.         struct drm_dp_sideband_msg_rx up_req_recv;
  429.  
  430.         /* pointer to info about the initial MST device */
  431.         struct mutex lock; /* protects mst_state + primary + dpcd */
  432.  
  433.         bool mst_state;
  434.         struct drm_dp_mst_branch *mst_primary;
  435.  
  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.         bool tx_down_in_progress;
  449.  
  450.         /* payload info + lock for it */
  451.         struct mutex payload_lock;
  452.         struct drm_dp_vcpi **proposed_vcpis;
  453.         struct drm_dp_payload *payloads;
  454.         unsigned long payload_mask;
  455.         unsigned long vcpi_mask;
  456.  
  457.         wait_queue_head_t tx_waitq;
  458.         struct work_struct work;
  459.  
  460.         struct work_struct tx_work;
  461.  
  462.         struct list_head destroy_connector_list;
  463.         struct mutex destroy_connector_lock;
  464.         struct work_struct destroy_connector_work;
  465. };
  466.  
  467. 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);
  468.  
  469. void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
  470.  
  471.  
  472. int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);
  473.  
  474.  
  475. int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);
  476.  
  477.  
  478. 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);
  479.  
  480. struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
  481.  
  482.  
  483. int drm_dp_calc_pbn_mode(int clock, int bpp);
  484.  
  485.  
  486. bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots);
  487.  
  488. int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
  489.  
  490.  
  491. void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
  492.  
  493.  
  494. void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
  495.                                 struct drm_dp_mst_port *port);
  496.  
  497.  
  498. int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
  499.                            int pbn);
  500.  
  501.  
  502. int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);
  503.  
  504.  
  505. int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);
  506.  
  507. int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);
  508.  
  509. void drm_dp_mst_dump_topology(struct seq_file *m,
  510.                               struct drm_dp_mst_topology_mgr *mgr);
  511.  
  512. void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
  513. int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
  514. #endif
  515.