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 (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr, 378 struct drm_connector *connector); 379 void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr); 380 381 }; 382 383 #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8) 384 385 #define DP_PAYLOAD_LOCAL 1 386 #define DP_PAYLOAD_REMOTE 2 387 #define DP_PAYLOAD_DELETE_LOCAL 3 388 389 struct drm_dp_payload { 390 int payload_state; 391 int start_slot; 392 int num_slots; 393 int vcpi; 394 }; 395 396 /** 397 * struct drm_dp_mst_topology_mgr - DisplayPort MST manager 398 * @dev: device pointer for adding i2c devices etc. 399 * @cbs: callbacks for connector addition and destruction. 400 * @max_dpcd_transaction_bytes - maximum number of bytes to read/write in one go. 401 * @aux: aux channel for the DP connector. 402 * @max_payloads: maximum number of payloads the GPU can generate. 403 * @conn_base_id: DRM connector ID this mgr is connected to. 404 * @down_rep_recv: msg receiver state for down replies. 405 * @up_req_recv: msg receiver state for up requests. 406 * @lock: protects mst state, primary, dpcd. 407 * @mst_state: if this manager is enabled for an MST capable port. 408 * @mst_primary: pointer to the primary branch device. 409 * @dpcd: cache of DPCD for primary port. 410 * @pbn_div: PBN to slots divisor. 411 * 412 * This struct represents the toplevel displayport MST topology manager. 413 * There should be one instance of this for every MST capable DP connector 414 * on the GPU. 415 */ 416 struct drm_dp_mst_topology_mgr { 417 418 struct device *dev; 419 struct drm_dp_mst_topology_cbs *cbs; 420 int max_dpcd_transaction_bytes; 421 struct drm_dp_aux *aux; /* auxch for this topology mgr to use */ 422 int max_payloads; 423 int conn_base_id; 424 425 /* only ever accessed from the workqueue - which should be serialised */ 426 struct drm_dp_sideband_msg_rx down_rep_recv; 427 struct drm_dp_sideband_msg_rx up_req_recv; 428 429 /* pointer to info about the initial MST device */ 430 struct mutex lock; /* protects mst_state + primary + dpcd */ 431 432 bool mst_state; 433 struct drm_dp_mst_branch *mst_primary; 434 435 u8 dpcd[DP_RECEIVER_CAP_SIZE]; 436 u8 sink_count; 437 int pbn_div; 438 int total_slots; 439 int avail_slots; 440 int total_pbn; 441 442 /* messages to be transmitted */ 443 /* qlock protects the upq/downq and in_progress, 444 the mstb tx_slots and txmsg->state once they are queued */ 445 struct mutex qlock; 446 struct list_head tx_msg_downq; 447 bool tx_down_in_progress; 448 449 /* payload info + lock for it */ 450 struct mutex payload_lock; 451 struct drm_dp_vcpi **proposed_vcpis; 452 struct drm_dp_payload *payloads; 453 unsigned long payload_mask; 454 unsigned long vcpi_mask; 455 456 wait_queue_head_t tx_waitq; 457 struct work_struct work; 458 459 struct work_struct tx_work; 460 461 struct list_head destroy_connector_list; 462 struct mutex destroy_connector_lock; 463 struct work_struct destroy_connector_work; 464 }; 465 466 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); 467 468 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr); 469 470 471 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state); 472 473 474 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled); 475 476 477 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); 478 479 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); 480 481 482 int drm_dp_calc_pbn_mode(int clock, int bpp); 483 484 485 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots); 486 487 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); 488 489 490 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); 491 492 493 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, 494 struct drm_dp_mst_port *port); 495 496 497 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, 498 int pbn); 499 500 501 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr); 502 503 504 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr); 505 506 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr); 507 508 void drm_dp_mst_dump_topology(struct seq_file *m, 509 struct drm_dp_mst_topology_mgr *mgr); 510 511 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr); 512 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr); 513 #endif 514