include/drm/drm_dp_mst_helper.h

   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