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 23 #include <linux/kernel.h> 24 #include <linux/delay.h> 25 #include <linux/init.h> 26 #include <linux/errno.h> 27 #include <linux/sched.h> 28 #include <linux/seq_file.h> 29 #include <linux/i2c.h> 30 #include <drm/drm_dp_mst_helper.h> 31 #include <drm/drmP.h> 32 33 #include <drm/drm_fixed.h> 34 #include <drm/drm_atomic.h> 35 #include <drm/drm_atomic_helper.h> 36 37 /** 38 * DOC: dp mst helper 39 * 40 * These functions contain parts of the DisplayPort 1.2a MultiStream Transport 41 * protocol. The helpers contain a topology manager and bandwidth manager. 42 * The helpers encapsulate the sending and received of sideband msgs. 43 */ 44 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, 45 char *buf); 46 static int test_calc_pbn_mode(void); 47 48 static void drm_dp_put_port(struct drm_dp_mst_port *port); 49 50 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, 51 int id, 52 struct drm_dp_payload *payload); 53 54 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, 55 struct drm_dp_mst_port *port, 56 int offset, int size, u8 *bytes); 57 58 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, 59 struct drm_dp_mst_branch *mstb); 60 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, 61 struct drm_dp_mst_branch *mstb, 62 struct drm_dp_mst_port *port); 63 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, 64 u8 *guid); 65 66 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); 67 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); 68 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); 69 /* sideband msg handling */ 70 static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) 71 { 72 u8 bitmask = 0x80; 73 u8 bitshift = 7; 74 u8 array_index = 0; 75 int number_of_bits = num_nibbles * 4; 76 u8 remainder = 0; 77 78 while (number_of_bits != 0) { 79 number_of_bits--; 80 remainder <<= 1; 81 remainder |= (data[array_index] & bitmask) >> bitshift; 82 bitmask >>= 1; 83 bitshift--; 84 if (bitmask == 0) { 85 bitmask = 0x80; 86 bitshift = 7; 87 array_index++; 88 } 89 if ((remainder & 0x10) == 0x10) 90 remainder ^= 0x13; 91 } 92 93 number_of_bits = 4; 94 while (number_of_bits != 0) { 95 number_of_bits--; 96 remainder <<= 1; 97 if ((remainder & 0x10) != 0) 98 remainder ^= 0x13; 99 } 100 101 return remainder; 102 } 103 104 static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) 105 { 106 u8 bitmask = 0x80; 107 u8 bitshift = 7; 108 u8 array_index = 0; 109 int number_of_bits = number_of_bytes * 8; 110 u16 remainder = 0; 111 112 while (number_of_bits != 0) { 113 number_of_bits--; 114 remainder <<= 1; 115 remainder |= (data[array_index] & bitmask) >> bitshift; 116 bitmask >>= 1; 117 bitshift--; 118 if (bitmask == 0) { 119 bitmask = 0x80; 120 bitshift = 7; 121 array_index++; 122 } 123 if ((remainder & 0x100) == 0x100) 124 remainder ^= 0xd5; 125 } 126 127 number_of_bits = 8; 128 while (number_of_bits != 0) { 129 number_of_bits--; 130 remainder <<= 1; 131 if ((remainder & 0x100) != 0) 132 remainder ^= 0xd5; 133 } 134 135 return remainder & 0xff; 136 } 137 static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) 138 { 139 u8 size = 3; 140 size += (hdr->lct / 2); 141 return size; 142 } 143 144 static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, 145 u8 *buf, int *len) 146 { 147 int idx = 0; 148 int i; 149 u8 crc4; 150 buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); 151 for (i = 0; i < (hdr->lct / 2); i++) 152 buf[idx++] = hdr->rad[i]; 153 buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | 154 (hdr->msg_len & 0x3f); 155 buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); 156 157 crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); 158 buf[idx - 1] |= (crc4 & 0xf); 159 160 *len = idx; 161 } 162 163 static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, 164 u8 *buf, int buflen, u8 *hdrlen) 165 { 166 u8 crc4; 167 u8 len; 168 int i; 169 u8 idx; 170 if (buf[0] == 0) 171 return false; 172 len = 3; 173 len += ((buf[0] & 0xf0) >> 4) / 2; 174 if (len > buflen) 175 return false; 176 crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); 177 178 if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { 179 DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); 180 return false; 181 } 182 183 hdr->lct = (buf[0] & 0xf0) >> 4; 184 hdr->lcr = (buf[0] & 0xf); 185 idx = 1; 186 for (i = 0; i < (hdr->lct / 2); i++) 187 hdr->rad[i] = buf[idx++]; 188 hdr->broadcast = (buf[idx] >> 7) & 0x1; 189 hdr->path_msg = (buf[idx] >> 6) & 0x1; 190 hdr->msg_len = buf[idx] & 0x3f; 191 idx++; 192 hdr->somt = (buf[idx] >> 7) & 0x1; 193 hdr->eomt = (buf[idx] >> 6) & 0x1; 194 hdr->seqno = (buf[idx] >> 4) & 0x1; 195 idx++; 196 *hdrlen = idx; 197 return true; 198 } 199 200 static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, 201 struct drm_dp_sideband_msg_tx *raw) 202 { 203 int idx = 0; 204 int i; 205 u8 *buf = raw->msg; 206 buf[idx++] = req->req_type & 0x7f; 207 208 switch (req->req_type) { 209 case DP_ENUM_PATH_RESOURCES: 210 buf[idx] = (req->u.port_num.port_number & 0xf) << 4; 211 idx++; 212 break; 213 case DP_ALLOCATE_PAYLOAD: 214 buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | 215 (req->u.allocate_payload.number_sdp_streams & 0xf); 216 idx++; 217 buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); 218 idx++; 219 buf[idx] = (req->u.allocate_payload.pbn >> 8); 220 idx++; 221 buf[idx] = (req->u.allocate_payload.pbn & 0xff); 222 idx++; 223 for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { 224 buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | 225 (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); 226 idx++; 227 } 228 if (req->u.allocate_payload.number_sdp_streams & 1) { 229 i = req->u.allocate_payload.number_sdp_streams - 1; 230 buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; 231 idx++; 232 } 233 break; 234 case DP_QUERY_PAYLOAD: 235 buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; 236 idx++; 237 buf[idx] = (req->u.query_payload.vcpi & 0x7f); 238 idx++; 239 break; 240 case DP_REMOTE_DPCD_READ: 241 buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; 242 buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; 243 idx++; 244 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; 245 idx++; 246 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); 247 idx++; 248 buf[idx] = (req->u.dpcd_read.num_bytes); 249 idx++; 250 break; 251 252 case DP_REMOTE_DPCD_WRITE: 253 buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; 254 buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; 255 idx++; 256 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; 257 idx++; 258 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); 259 idx++; 260 buf[idx] = (req->u.dpcd_write.num_bytes); 261 idx++; 262 memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); 263 idx += req->u.dpcd_write.num_bytes; 264 break; 265 case DP_REMOTE_I2C_READ: 266 buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; 267 buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); 268 idx++; 269 for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { 270 buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; 271 idx++; 272 buf[idx] = req->u.i2c_read.transactions[i].num_bytes; 273 idx++; 274 memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); 275 idx += req->u.i2c_read.transactions[i].num_bytes; 276 277 buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; 278 buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); 279 idx++; 280 } 281 buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; 282 idx++; 283 buf[idx] = (req->u.i2c_read.num_bytes_read); 284 idx++; 285 break; 286 287 case DP_REMOTE_I2C_WRITE: 288 buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; 289 idx++; 290 buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; 291 idx++; 292 buf[idx] = (req->u.i2c_write.num_bytes); 293 idx++; 294 memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); 295 idx += req->u.i2c_write.num_bytes; 296 break; 297 298 case DP_POWER_DOWN_PHY: 299 case DP_POWER_UP_PHY: 300 buf[idx] = (req->u.port_num.port_number & 0xf) << 4; 301 idx++; 302 break; 303 } 304 raw->cur_len = idx; 305 } 306 307 static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) 308 { 309 u8 crc4; 310 crc4 = drm_dp_msg_data_crc4(msg, len); 311 msg[len] = crc4; 312 } 313 314 static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, 315 struct drm_dp_sideband_msg_tx *raw) 316 { 317 int idx = 0; 318 u8 *buf = raw->msg; 319 320 buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); 321 322 raw->cur_len = idx; 323 } 324 325 /* this adds a chunk of msg to the builder to get the final msg */ 326 static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, 327 u8 *replybuf, u8 replybuflen, bool hdr) 328 { 329 int ret; 330 u8 crc4; 331 332 if (hdr) { 333 u8 hdrlen; 334 struct drm_dp_sideband_msg_hdr recv_hdr; 335 ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); 336 if (ret == false) { 337 print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); 338 return false; 339 } 340 341 /* 342 * ignore out-of-order messages or messages that are part of a 343 * failed transaction 344 */ 345 if (!recv_hdr.somt && !msg->have_somt) 346 return false; 347 348 /* get length contained in this portion */ 349 msg->curchunk_len = recv_hdr.msg_len; 350 msg->curchunk_hdrlen = hdrlen; 351 352 /* we have already gotten an somt - don't bother parsing */ 353 if (recv_hdr.somt && msg->have_somt) 354 return false; 355 356 if (recv_hdr.somt) { 357 memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); 358 msg->have_somt = true; 359 } 360 if (recv_hdr.eomt) 361 msg->have_eomt = true; 362 363 /* copy the bytes for the remainder of this header chunk */ 364 msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); 365 memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); 366 } else { 367 memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); 368 msg->curchunk_idx += replybuflen; 369 } 370 371 if (msg->curchunk_idx >= msg->curchunk_len) { 372 /* do CRC */ 373 crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); 374 /* copy chunk into bigger msg */ 375 memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); 376 msg->curlen += msg->curchunk_len - 1; 377 } 378 return true; 379 } 380 381 static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, 382 struct drm_dp_sideband_msg_reply_body *repmsg) 383 { 384 int idx = 1; 385 int i; 386 memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); 387 idx += 16; 388 repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; 389 idx++; 390 if (idx > raw->curlen) 391 goto fail_len; 392 for (i = 0; i < repmsg->u.link_addr.nports; i++) { 393 if (raw->msg[idx] & 0x80) 394 repmsg->u.link_addr.ports[i].input_port = 1; 395 396 repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; 397 repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); 398 399 idx++; 400 if (idx > raw->curlen) 401 goto fail_len; 402 repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; 403 repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; 404 if (repmsg->u.link_addr.ports[i].input_port == 0) 405 repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; 406 idx++; 407 if (idx > raw->curlen) 408 goto fail_len; 409 if (repmsg->u.link_addr.ports[i].input_port == 0) { 410 repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); 411 idx++; 412 if (idx > raw->curlen) 413 goto fail_len; 414 memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); 415 idx += 16; 416 if (idx > raw->curlen) 417 goto fail_len; 418 repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; 419 repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); 420 idx++; 421 422 } 423 if (idx > raw->curlen) 424 goto fail_len; 425 } 426 427 return true; 428 fail_len: 429 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); 430 return false; 431 } 432 433 static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, 434 struct drm_dp_sideband_msg_reply_body *repmsg) 435 { 436 int idx = 1; 437 repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; 438 idx++; 439 if (idx > raw->curlen) 440 goto fail_len; 441 repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; 442 if (idx > raw->curlen) 443 goto fail_len; 444 445 memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); 446 return true; 447 fail_len: 448 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); 449 return false; 450 } 451 452 static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, 453 struct drm_dp_sideband_msg_reply_body *repmsg) 454 { 455 int idx = 1; 456 repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; 457 idx++; 458 if (idx > raw->curlen) 459 goto fail_len; 460 return true; 461 fail_len: 462 DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); 463 return false; 464 } 465 466 static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, 467 struct drm_dp_sideband_msg_reply_body *repmsg) 468 { 469 int idx = 1; 470 471 repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); 472 idx++; 473 if (idx > raw->curlen) 474 goto fail_len; 475 repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; 476 idx++; 477 /* TODO check */ 478 memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); 479 return true; 480 fail_len: 481 DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); 482 return false; 483 } 484 485 static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, 486 struct drm_dp_sideband_msg_reply_body *repmsg) 487 { 488 int idx = 1; 489 repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; 490 idx++; 491 if (idx > raw->curlen) 492 goto fail_len; 493 repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); 494 idx += 2; 495 if (idx > raw->curlen) 496 goto fail_len; 497 repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); 498 idx += 2; 499 if (idx > raw->curlen) 500 goto fail_len; 501 return true; 502 fail_len: 503 DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); 504 return false; 505 } 506 507 static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, 508 struct drm_dp_sideband_msg_reply_body *repmsg) 509 { 510 int idx = 1; 511 repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; 512 idx++; 513 if (idx > raw->curlen) 514 goto fail_len; 515 repmsg->u.allocate_payload.vcpi = raw->msg[idx]; 516 idx++; 517 if (idx > raw->curlen) 518 goto fail_len; 519 repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); 520 idx += 2; 521 if (idx > raw->curlen) 522 goto fail_len; 523 return true; 524 fail_len: 525 DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); 526 return false; 527 } 528 529 static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, 530 struct drm_dp_sideband_msg_reply_body *repmsg) 531 { 532 int idx = 1; 533 repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; 534 idx++; 535 if (idx > raw->curlen) 536 goto fail_len; 537 repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); 538 idx += 2; 539 if (idx > raw->curlen) 540 goto fail_len; 541 return true; 542 fail_len: 543 DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); 544 return false; 545 } 546 547 static bool drm_dp_sideband_parse_power_updown_phy_ack(struct drm_dp_sideband_msg_rx *raw, 548 struct drm_dp_sideband_msg_reply_body *repmsg) 549 { 550 int idx = 1; 551 552 repmsg->u.port_number.port_number = (raw->msg[idx] >> 4) & 0xf; 553 idx++; 554 if (idx > raw->curlen) { 555 DRM_DEBUG_KMS("power up/down phy parse length fail %d %d\n", 556 idx, raw->curlen); 557 return false; 558 } 559 return true; 560 } 561 562 static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, 563 struct drm_dp_sideband_msg_reply_body *msg) 564 { 565 memset(msg, 0, sizeof(*msg)); 566 msg->reply_type = (raw->msg[0] & 0x80) >> 7; 567 msg->req_type = (raw->msg[0] & 0x7f); 568 569 if (msg->reply_type) { 570 memcpy(msg->u.nak.guid, &raw->msg[1], 16); 571 msg->u.nak.reason = raw->msg[17]; 572 msg->u.nak.nak_data = raw->msg[18]; 573 return false; 574 } 575 576 switch (msg->req_type) { 577 case DP_LINK_ADDRESS: 578 return drm_dp_sideband_parse_link_address(raw, msg); 579 case DP_QUERY_PAYLOAD: 580 return drm_dp_sideband_parse_query_payload_ack(raw, msg); 581 case DP_REMOTE_DPCD_READ: 582 return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); 583 case DP_REMOTE_DPCD_WRITE: 584 return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); 585 case DP_REMOTE_I2C_READ: 586 return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); 587 case DP_ENUM_PATH_RESOURCES: 588 return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); 589 case DP_ALLOCATE_PAYLOAD: 590 return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); 591 case DP_POWER_DOWN_PHY: 592 case DP_POWER_UP_PHY: 593 return drm_dp_sideband_parse_power_updown_phy_ack(raw, msg); 594 default: 595 DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); 596 return false; 597 } 598 } 599 600 static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, 601 struct drm_dp_sideband_msg_req_body *msg) 602 { 603 int idx = 1; 604 605 msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; 606 idx++; 607 if (idx > raw->curlen) 608 goto fail_len; 609 610 memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); 611 idx += 16; 612 if (idx > raw->curlen) 613 goto fail_len; 614 615 msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; 616 msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; 617 msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; 618 msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; 619 msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); 620 idx++; 621 return true; 622 fail_len: 623 DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); 624 return false; 625 } 626 627 static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, 628 struct drm_dp_sideband_msg_req_body *msg) 629 { 630 int idx = 1; 631 632 msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; 633 idx++; 634 if (idx > raw->curlen) 635 goto fail_len; 636 637 memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); 638 idx += 16; 639 if (idx > raw->curlen) 640 goto fail_len; 641 642 msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); 643 idx++; 644 return true; 645 fail_len: 646 DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); 647 return false; 648 } 649 650 static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, 651 struct drm_dp_sideband_msg_req_body *msg) 652 { 653 memset(msg, 0, sizeof(*msg)); 654 msg->req_type = (raw->msg[0] & 0x7f); 655 656 switch (msg->req_type) { 657 case DP_CONNECTION_STATUS_NOTIFY: 658 return drm_dp_sideband_parse_connection_status_notify(raw, msg); 659 case DP_RESOURCE_STATUS_NOTIFY: 660 return drm_dp_sideband_parse_resource_status_notify(raw, msg); 661 default: 662 DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); 663 return false; 664 } 665 } 666 667 static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) 668 { 669 struct drm_dp_sideband_msg_req_body req; 670 671 req.req_type = DP_REMOTE_DPCD_WRITE; 672 req.u.dpcd_write.port_number = port_num; 673 req.u.dpcd_write.dpcd_address = offset; 674 req.u.dpcd_write.num_bytes = num_bytes; 675 req.u.dpcd_write.bytes = bytes; 676 drm_dp_encode_sideband_req(&req, msg); 677 678 return 0; 679 } 680 681 static int build_link_address(struct drm_dp_sideband_msg_tx *msg) 682 { 683 struct drm_dp_sideband_msg_req_body req; 684 685 req.req_type = DP_LINK_ADDRESS; 686 drm_dp_encode_sideband_req(&req, msg); 687 return 0; 688 } 689 690 static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) 691 { 692 struct drm_dp_sideband_msg_req_body req; 693 694 req.req_type = DP_ENUM_PATH_RESOURCES; 695 req.u.port_num.port_number = port_num; 696 drm_dp_encode_sideband_req(&req, msg); 697 msg->path_msg = true; 698 return 0; 699 } 700 701 static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, 702 u8 vcpi, uint16_t pbn, 703 u8 number_sdp_streams, 704 u8 *sdp_stream_sink) 705 { 706 struct drm_dp_sideband_msg_req_body req; 707 memset(&req, 0, sizeof(req)); 708 req.req_type = DP_ALLOCATE_PAYLOAD; 709 req.u.allocate_payload.port_number = port_num; 710 req.u.allocate_payload.vcpi = vcpi; 711 req.u.allocate_payload.pbn = pbn; 712 req.u.allocate_payload.number_sdp_streams = number_sdp_streams; 713 memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink, 714 number_sdp_streams); 715 drm_dp_encode_sideband_req(&req, msg); 716 msg->path_msg = true; 717 return 0; 718 } 719 720 static int build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg, 721 int port_num, bool power_up) 722 { 723 struct drm_dp_sideband_msg_req_body req; 724 725 if (power_up) 726 req.req_type = DP_POWER_UP_PHY; 727 else 728 req.req_type = DP_POWER_DOWN_PHY; 729 730 req.u.port_num.port_number = port_num; 731 drm_dp_encode_sideband_req(&req, msg); 732 msg->path_msg = true; 733 return 0; 734 } 735 736 static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, 737 struct drm_dp_vcpi *vcpi) 738 { 739 int ret, vcpi_ret; 740 741 mutex_lock(&mgr->payload_lock); 742 ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); 743 if (ret > mgr->max_payloads) { 744 ret = -EINVAL; 745 DRM_DEBUG_KMS("out of payload ids %d\n", ret); 746 goto out_unlock; 747 } 748 749 vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); 750 if (vcpi_ret > mgr->max_payloads) { 751 ret = -EINVAL; 752 DRM_DEBUG_KMS("out of vcpi ids %d\n", ret); 753 goto out_unlock; 754 } 755 756 set_bit(ret, &mgr->payload_mask); 757 set_bit(vcpi_ret, &mgr->vcpi_mask); 758 vcpi->vcpi = vcpi_ret + 1; 759 mgr->proposed_vcpis[ret - 1] = vcpi; 760 out_unlock: 761 mutex_unlock(&mgr->payload_lock); 762 return ret; 763 } 764 765 static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, 766 int vcpi) 767 { 768 int i; 769 if (vcpi == 0) 770 return; 771 772 mutex_lock(&mgr->payload_lock); 773 DRM_DEBUG_KMS("putting payload %d\n", vcpi); 774 clear_bit(vcpi - 1, &mgr->vcpi_mask); 775 776 for (i = 0; i < mgr->max_payloads; i++) { 777 if (mgr->proposed_vcpis[i]) 778 if (mgr->proposed_vcpis[i]->vcpi == vcpi) { 779 mgr->proposed_vcpis[i] = NULL; 780 clear_bit(i + 1, &mgr->payload_mask); 781 } 782 } 783 mutex_unlock(&mgr->payload_lock); 784 } 785 786 static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, 787 struct drm_dp_sideband_msg_tx *txmsg) 788 { 789 unsigned int state; 790 791 /* 792 * All updates to txmsg->state are protected by mgr->qlock, and the two 793 * cases we check here are terminal states. For those the barriers 794 * provided by the wake_up/wait_event pair are enough. 795 */ 796 state = READ_ONCE(txmsg->state); 797 return (state == DRM_DP_SIDEBAND_TX_RX || 798 state == DRM_DP_SIDEBAND_TX_TIMEOUT); 799 } 800 801 static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, 802 struct drm_dp_sideband_msg_tx *txmsg) 803 { 804 struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; 805 int ret; 806 807 ret = wait_event_timeout(mgr->tx_waitq, 808 check_txmsg_state(mgr, txmsg), 809 (4 * HZ)); 810 mutex_lock(&mstb->mgr->qlock); 811 if (ret > 0) { 812 if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { 813 ret = -EIO; 814 goto out; 815 } 816 } else { 817 DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); 818 819 /* dump some state */ 820 ret = -EIO; 821 822 /* remove from q */ 823 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || 824 txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { 825 list_del(&txmsg->next); 826 } 827 828 if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || 829 txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { 830 mstb->tx_slots[txmsg->seqno] = NULL; 831 } 832 } 833 out: 834 mutex_unlock(&mgr->qlock); 835 836 return ret; 837 } 838 839 static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) 840 { 841 struct drm_dp_mst_branch *mstb; 842 843 mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); 844 if (!mstb) 845 return NULL; 846 847 mstb->lct = lct; 848 if (lct > 1) 849 memcpy(mstb->rad, rad, lct / 2); 850 INIT_LIST_HEAD(&mstb->ports); 851 kref_init(&mstb->kref); 852 return mstb; 853 } 854 855 static void drm_dp_free_mst_port(struct kref *kref); 856 857 static void drm_dp_free_mst_branch_device(struct kref *kref) 858 { 859 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); 860 if (mstb->port_parent) { 861 if (list_empty(&mstb->port_parent->next)) 862 kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port); 863 } 864 kfree(mstb); 865 } 866 867 static void drm_dp_destroy_mst_branch_device(struct kref *kref) 868 { 869 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); 870 struct drm_dp_mst_port *port, *tmp; 871 bool wake_tx = false; 872 873 /* 874 * init kref again to be used by ports to remove mst branch when it is 875 * not needed anymore 876 */ 877 kref_init(kref); 878 879 if (mstb->port_parent && list_empty(&mstb->port_parent->next)) 880 kref_get(&mstb->port_parent->kref); 881 882 /* 883 * destroy all ports - don't need lock 884 * as there are no more references to the mst branch 885 * device at this point. 886 */ 887 list_for_each_entry_safe(port, tmp, &mstb->ports, next) { 888 list_del(&port->next); 889 drm_dp_put_port(port); 890 } 891 892 /* drop any tx slots msg */ 893 mutex_lock(&mstb->mgr->qlock); 894 if (mstb->tx_slots[0]) { 895 mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; 896 mstb->tx_slots[0] = NULL; 897 wake_tx = true; 898 } 899 if (mstb->tx_slots[1]) { 900 mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; 901 mstb->tx_slots[1] = NULL; 902 wake_tx = true; 903 } 904 mutex_unlock(&mstb->mgr->qlock); 905 906 if (wake_tx) 907 wake_up_all(&mstb->mgr->tx_waitq); 908 909 kref_put(kref, drm_dp_free_mst_branch_device); 910 } 911 912 static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) 913 { 914 kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); 915 } 916 917 918 static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) 919 { 920 struct drm_dp_mst_branch *mstb; 921 922 switch (old_pdt) { 923 case DP_PEER_DEVICE_DP_LEGACY_CONV: 924 case DP_PEER_DEVICE_SST_SINK: 925 /* remove i2c over sideband */ 926 drm_dp_mst_unregister_i2c_bus(&port->aux); 927 break; 928 case DP_PEER_DEVICE_MST_BRANCHING: 929 mstb = port->mstb; 930 port->mstb = NULL; 931 drm_dp_put_mst_branch_device(mstb); 932 break; 933 } 934 } 935 936 static void drm_dp_destroy_port(struct kref *kref) 937 { 938 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); 939 struct drm_dp_mst_topology_mgr *mgr = port->mgr; 940 941 if (!port->input) { 942 port->vcpi.num_slots = 0; 943 944 kfree(port->cached_edid); 945 946 /* 947 * The only time we don't have a connector 948 * on an output port is if the connector init 949 * fails. 950 */ 951 if (port->connector) { 952 /* we can't destroy the connector here, as 953 * we might be holding the mode_config.mutex 954 * from an EDID retrieval */ 955 956 mutex_lock(&mgr->destroy_connector_lock); 957 kref_get(&port->parent->kref); 958 list_add(&port->next, &mgr->destroy_connector_list); 959 mutex_unlock(&mgr->destroy_connector_lock); 960 schedule_work(&mgr->destroy_connector_work); 961 return; 962 } 963 /* no need to clean up vcpi 964 * as if we have no connector we never setup a vcpi */ 965 drm_dp_port_teardown_pdt(port, port->pdt); 966 port->pdt = DP_PEER_DEVICE_NONE; 967 } 968 kfree(port); 969 } 970 971 static void drm_dp_put_port(struct drm_dp_mst_port *port) 972 { 973 kref_put(&port->kref, drm_dp_destroy_port); 974 } 975 976 static struct drm_dp_mst_branch *drm_dp_mst_get_validated_mstb_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_branch *to_find) 977 { 978 struct drm_dp_mst_port *port; 979 struct drm_dp_mst_branch *rmstb; 980 if (to_find == mstb) { 981 kref_get(&mstb->kref); 982 return mstb; 983 } 984 list_for_each_entry(port, &mstb->ports, next) { 985 if (port->mstb) { 986 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); 987 if (rmstb) 988 return rmstb; 989 } 990 } 991 return NULL; 992 } 993 994 static struct drm_dp_mst_branch *drm_dp_get_validated_mstb_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_branch *mstb) 995 { 996 struct drm_dp_mst_branch *rmstb = NULL; 997 mutex_lock(&mgr->lock); 998 if (mgr->mst_primary) 999 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb); 1000 mutex_unlock(&mgr->lock); 1001 return rmstb; 1002 } 1003 1004 static struct drm_dp_mst_port *drm_dp_mst_get_port_ref_locked(struct drm_dp_mst_branch *mstb, struct drm_dp_mst_port *to_find) 1005 { 1006 struct drm_dp_mst_port *port, *mport; 1007 1008 list_for_each_entry(port, &mstb->ports, next) { 1009 if (port == to_find) { 1010 kref_get(&port->kref); 1011 return port; 1012 } 1013 if (port->mstb) { 1014 mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); 1015 if (mport) 1016 return mport; 1017 } 1018 } 1019 return NULL; 1020 } 1021 1022 static struct drm_dp_mst_port *drm_dp_get_validated_port_ref(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 1023 { 1024 struct drm_dp_mst_port *rport = NULL; 1025 mutex_lock(&mgr->lock); 1026 if (mgr->mst_primary) 1027 rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); 1028 mutex_unlock(&mgr->lock); 1029 return rport; 1030 } 1031 1032 static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) 1033 { 1034 struct drm_dp_mst_port *port; 1035 1036 list_for_each_entry(port, &mstb->ports, next) { 1037 if (port->port_num == port_num) { 1038 kref_get(&port->kref); 1039 return port; 1040 } 1041 } 1042 1043 return NULL; 1044 } 1045 1046 /* 1047 * calculate a new RAD for this MST branch device 1048 * if parent has an LCT of 2 then it has 1 nibble of RAD, 1049 * if parent has an LCT of 3 then it has 2 nibbles of RAD, 1050 */ 1051 static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, 1052 u8 *rad) 1053 { 1054 int parent_lct = port->parent->lct; 1055 int shift = 4; 1056 int idx = (parent_lct - 1) / 2; 1057 if (parent_lct > 1) { 1058 memcpy(rad, port->parent->rad, idx + 1); 1059 shift = (parent_lct % 2) ? 4 : 0; 1060 } else 1061 rad[0] = 0; 1062 1063 rad[idx] |= port->port_num << shift; 1064 return parent_lct + 1; 1065 } 1066 1067 /* 1068 * return sends link address for new mstb 1069 */ 1070 static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) 1071 { 1072 int ret; 1073 u8 rad[6], lct; 1074 bool send_link = false; 1075 switch (port->pdt) { 1076 case DP_PEER_DEVICE_DP_LEGACY_CONV: 1077 case DP_PEER_DEVICE_SST_SINK: 1078 /* add i2c over sideband */ 1079 ret = drm_dp_mst_register_i2c_bus(&port->aux); 1080 break; 1081 case DP_PEER_DEVICE_MST_BRANCHING: 1082 lct = drm_dp_calculate_rad(port, rad); 1083 1084 port->mstb = drm_dp_add_mst_branch_device(lct, rad); 1085 port->mstb->mgr = port->mgr; 1086 port->mstb->port_parent = port; 1087 1088 send_link = true; 1089 break; 1090 } 1091 return send_link; 1092 } 1093 1094 static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) 1095 { 1096 int ret; 1097 1098 memcpy(mstb->guid, guid, 16); 1099 1100 if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { 1101 if (mstb->port_parent) { 1102 ret = drm_dp_send_dpcd_write( 1103 mstb->mgr, 1104 mstb->port_parent, 1105 DP_GUID, 1106 16, 1107 mstb->guid); 1108 } else { 1109 1110 ret = drm_dp_dpcd_write( 1111 mstb->mgr->aux, 1112 DP_GUID, 1113 mstb->guid, 1114 16); 1115 } 1116 } 1117 } 1118 1119 static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, 1120 int pnum, 1121 char *proppath, 1122 size_t proppath_size) 1123 { 1124 int i; 1125 char temp[8]; 1126 snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); 1127 for (i = 0; i < (mstb->lct - 1); i++) { 1128 int shift = (i % 2) ? 0 : 4; 1129 int port_num = (mstb->rad[i / 2] >> shift) & 0xf; 1130 snprintf(temp, sizeof(temp), "-%d", port_num); 1131 strlcat(proppath, temp, proppath_size); 1132 } 1133 snprintf(temp, sizeof(temp), "-%d", pnum); 1134 strlcat(proppath, temp, proppath_size); 1135 } 1136 1137 static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, 1138 struct drm_device *dev, 1139 struct drm_dp_link_addr_reply_port *port_msg) 1140 { 1141 struct drm_dp_mst_port *port; 1142 bool ret; 1143 bool created = false; 1144 int old_pdt = 0; 1145 int old_ddps = 0; 1146 port = drm_dp_get_port(mstb, port_msg->port_number); 1147 if (!port) { 1148 port = kzalloc(sizeof(*port), GFP_KERNEL); 1149 if (!port) 1150 return; 1151 kref_init(&port->kref); 1152 port->parent = mstb; 1153 port->port_num = port_msg->port_number; 1154 port->mgr = mstb->mgr; 1155 port->aux.name = "DPMST"; 1156 port->aux.dev = dev->dev; 1157 created = true; 1158 } else { 1159 old_pdt = port->pdt; 1160 old_ddps = port->ddps; 1161 } 1162 1163 port->pdt = port_msg->peer_device_type; 1164 port->input = port_msg->input_port; 1165 port->mcs = port_msg->mcs; 1166 port->ddps = port_msg->ddps; 1167 port->ldps = port_msg->legacy_device_plug_status; 1168 port->dpcd_rev = port_msg->dpcd_revision; 1169 port->num_sdp_streams = port_msg->num_sdp_streams; 1170 port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; 1171 1172 /* manage mstb port lists with mgr lock - take a reference 1173 for this list */ 1174 if (created) { 1175 mutex_lock(&mstb->mgr->lock); 1176 kref_get(&port->kref); 1177 list_add(&port->next, &mstb->ports); 1178 mutex_unlock(&mstb->mgr->lock); 1179 } 1180 1181 if (old_ddps != port->ddps) { 1182 if (port->ddps) { 1183 if (!port->input) 1184 drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); 1185 } else { 1186 port->available_pbn = 0; 1187 } 1188 } 1189 1190 if (old_pdt != port->pdt && !port->input) { 1191 drm_dp_port_teardown_pdt(port, old_pdt); 1192 1193 ret = drm_dp_port_setup_pdt(port); 1194 if (ret == true) 1195 drm_dp_send_link_address(mstb->mgr, port->mstb); 1196 } 1197 1198 if (created && !port->input) { 1199 char proppath[255]; 1200 1201 build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath)); 1202 port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath); 1203 if (!port->connector) { 1204 /* remove it from the port list */ 1205 mutex_lock(&mstb->mgr->lock); 1206 list_del(&port->next); 1207 mutex_unlock(&mstb->mgr->lock); 1208 /* drop port list reference */ 1209 drm_dp_put_port(port); 1210 goto out; 1211 } 1212 if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV || 1213 port->pdt == DP_PEER_DEVICE_SST_SINK) && 1214 port->port_num >= DP_MST_LOGICAL_PORT_0) { 1215 port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc); 1216 drm_mode_connector_set_tile_property(port->connector); 1217 } 1218 (*mstb->mgr->cbs->register_connector)(port->connector); 1219 } 1220 1221 out: 1222 /* put reference to this port */ 1223 drm_dp_put_port(port); 1224 } 1225 1226 static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, 1227 struct drm_dp_connection_status_notify *conn_stat) 1228 { 1229 struct drm_dp_mst_port *port; 1230 int old_pdt; 1231 int old_ddps; 1232 bool dowork = false; 1233 port = drm_dp_get_port(mstb, conn_stat->port_number); 1234 if (!port) 1235 return; 1236 1237 old_ddps = port->ddps; 1238 old_pdt = port->pdt; 1239 port->pdt = conn_stat->peer_device_type; 1240 port->mcs = conn_stat->message_capability_status; 1241 port->ldps = conn_stat->legacy_device_plug_status; 1242 port->ddps = conn_stat->displayport_device_plug_status; 1243 1244 if (old_ddps != port->ddps) { 1245 if (port->ddps) { 1246 dowork = true; 1247 } else { 1248 port->available_pbn = 0; 1249 } 1250 } 1251 if (old_pdt != port->pdt && !port->input) { 1252 drm_dp_port_teardown_pdt(port, old_pdt); 1253 1254 if (drm_dp_port_setup_pdt(port)) 1255 dowork = true; 1256 } 1257 1258 drm_dp_put_port(port); 1259 if (dowork) 1260 queue_work(system_long_wq, &mstb->mgr->work); 1261 1262 } 1263 1264 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, 1265 u8 lct, u8 *rad) 1266 { 1267 struct drm_dp_mst_branch *mstb; 1268 struct drm_dp_mst_port *port; 1269 int i; 1270 /* find the port by iterating down */ 1271 1272 mutex_lock(&mgr->lock); 1273 mstb = mgr->mst_primary; 1274 1275 for (i = 0; i < lct - 1; i++) { 1276 int shift = (i % 2) ? 0 : 4; 1277 int port_num = (rad[i / 2] >> shift) & 0xf; 1278 1279 list_for_each_entry(port, &mstb->ports, next) { 1280 if (port->port_num == port_num) { 1281 mstb = port->mstb; 1282 if (!mstb) { 1283 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); 1284 goto out; 1285 } 1286 1287 break; 1288 } 1289 } 1290 } 1291 kref_get(&mstb->kref); 1292 out: 1293 mutex_unlock(&mgr->lock); 1294 return mstb; 1295 } 1296 1297 static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( 1298 struct drm_dp_mst_branch *mstb, 1299 uint8_t *guid) 1300 { 1301 struct drm_dp_mst_branch *found_mstb; 1302 struct drm_dp_mst_port *port; 1303 1304 if (memcmp(mstb->guid, guid, 16) == 0) 1305 return mstb; 1306 1307 1308 list_for_each_entry(port, &mstb->ports, next) { 1309 if (!port->mstb) 1310 continue; 1311 1312 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); 1313 1314 if (found_mstb) 1315 return found_mstb; 1316 } 1317 1318 return NULL; 1319 } 1320 1321 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid( 1322 struct drm_dp_mst_topology_mgr *mgr, 1323 uint8_t *guid) 1324 { 1325 struct drm_dp_mst_branch *mstb; 1326 1327 /* find the port by iterating down */ 1328 mutex_lock(&mgr->lock); 1329 1330 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); 1331 1332 if (mstb) 1333 kref_get(&mstb->kref); 1334 1335 mutex_unlock(&mgr->lock); 1336 return mstb; 1337 } 1338 1339 static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, 1340 struct drm_dp_mst_branch *mstb) 1341 { 1342 struct drm_dp_mst_port *port; 1343 struct drm_dp_mst_branch *mstb_child; 1344 if (!mstb->link_address_sent) 1345 drm_dp_send_link_address(mgr, mstb); 1346 1347 list_for_each_entry(port, &mstb->ports, next) { 1348 if (port->input) 1349 continue; 1350 1351 if (!port->ddps) 1352 continue; 1353 1354 if (!port->available_pbn) 1355 drm_dp_send_enum_path_resources(mgr, mstb, port); 1356 1357 if (port->mstb) { 1358 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb); 1359 if (mstb_child) { 1360 drm_dp_check_and_send_link_address(mgr, mstb_child); 1361 drm_dp_put_mst_branch_device(mstb_child); 1362 } 1363 } 1364 } 1365 } 1366 1367 static void drm_dp_mst_link_probe_work(struct work_struct *work) 1368 { 1369 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); 1370 struct drm_dp_mst_branch *mstb; 1371 1372 mutex_lock(&mgr->lock); 1373 mstb = mgr->mst_primary; 1374 if (mstb) { 1375 kref_get(&mstb->kref); 1376 } 1377 mutex_unlock(&mgr->lock); 1378 if (mstb) { 1379 drm_dp_check_and_send_link_address(mgr, mstb); 1380 drm_dp_put_mst_branch_device(mstb); 1381 } 1382 } 1383 1384 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, 1385 u8 *guid) 1386 { 1387 u64 salt; 1388 1389 if (memchr_inv(guid, 0, 16)) 1390 return true; 1391 1392 salt = get_jiffies_64(); 1393 1394 memcpy(&guid[0], &salt, sizeof(u64)); 1395 memcpy(&guid[8], &salt, sizeof(u64)); 1396 1397 return false; 1398 } 1399 1400 #if 0 1401 static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) 1402 { 1403 struct drm_dp_sideband_msg_req_body req; 1404 1405 req.req_type = DP_REMOTE_DPCD_READ; 1406 req.u.dpcd_read.port_number = port_num; 1407 req.u.dpcd_read.dpcd_address = offset; 1408 req.u.dpcd_read.num_bytes = num_bytes; 1409 drm_dp_encode_sideband_req(&req, msg); 1410 1411 return 0; 1412 } 1413 #endif 1414 1415 static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, 1416 bool up, u8 *msg, int len) 1417 { 1418 int ret; 1419 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; 1420 int tosend, total, offset; 1421 int retries = 0; 1422 1423 retry: 1424 total = len; 1425 offset = 0; 1426 do { 1427 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); 1428 1429 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, 1430 &msg[offset], 1431 tosend); 1432 if (ret != tosend) { 1433 if (ret == -EIO && retries < 5) { 1434 retries++; 1435 goto retry; 1436 } 1437 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); 1438 1439 return -EIO; 1440 } 1441 offset += tosend; 1442 total -= tosend; 1443 } while (total > 0); 1444 return 0; 1445 } 1446 1447 static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, 1448 struct drm_dp_sideband_msg_tx *txmsg) 1449 { 1450 struct drm_dp_mst_branch *mstb = txmsg->dst; 1451 u8 req_type; 1452 1453 /* both msg slots are full */ 1454 if (txmsg->seqno == -1) { 1455 if (mstb->tx_slots[0] && mstb->tx_slots[1]) { 1456 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); 1457 return -EAGAIN; 1458 } 1459 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { 1460 txmsg->seqno = mstb->last_seqno; 1461 mstb->last_seqno ^= 1; 1462 } else if (mstb->tx_slots[0] == NULL) 1463 txmsg->seqno = 0; 1464 else 1465 txmsg->seqno = 1; 1466 mstb->tx_slots[txmsg->seqno] = txmsg; 1467 } 1468 1469 req_type = txmsg->msg[0] & 0x7f; 1470 if (req_type == DP_CONNECTION_STATUS_NOTIFY || 1471 req_type == DP_RESOURCE_STATUS_NOTIFY) 1472 hdr->broadcast = 1; 1473 else 1474 hdr->broadcast = 0; 1475 hdr->path_msg = txmsg->path_msg; 1476 hdr->lct = mstb->lct; 1477 hdr->lcr = mstb->lct - 1; 1478 if (mstb->lct > 1) 1479 memcpy(hdr->rad, mstb->rad, mstb->lct / 2); 1480 hdr->seqno = txmsg->seqno; 1481 return 0; 1482 } 1483 /* 1484 * process a single block of the next message in the sideband queue 1485 */ 1486 static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, 1487 struct drm_dp_sideband_msg_tx *txmsg, 1488 bool up) 1489 { 1490 u8 chunk[48]; 1491 struct drm_dp_sideband_msg_hdr hdr; 1492 int len, space, idx, tosend; 1493 int ret; 1494 1495 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); 1496 1497 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { 1498 txmsg->seqno = -1; 1499 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; 1500 } 1501 1502 /* make hdr from dst mst - for replies use seqno 1503 otherwise assign one */ 1504 ret = set_hdr_from_dst_qlock(&hdr, txmsg); 1505 if (ret < 0) 1506 return ret; 1507 1508 /* amount left to send in this message */ 1509 len = txmsg->cur_len - txmsg->cur_offset; 1510 1511 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ 1512 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); 1513 1514 tosend = min(len, space); 1515 if (len == txmsg->cur_len) 1516 hdr.somt = 1; 1517 if (space >= len) 1518 hdr.eomt = 1; 1519 1520 1521 hdr.msg_len = tosend + 1; 1522 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); 1523 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); 1524 /* add crc at end */ 1525 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); 1526 idx += tosend + 1; 1527 1528 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); 1529 if (ret) { 1530 DRM_DEBUG_KMS("sideband msg failed to send\n"); 1531 return ret; 1532 } 1533 1534 txmsg->cur_offset += tosend; 1535 if (txmsg->cur_offset == txmsg->cur_len) { 1536 txmsg->state = DRM_DP_SIDEBAND_TX_SENT; 1537 return 1; 1538 } 1539 return 0; 1540 } 1541 1542 static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) 1543 { 1544 struct drm_dp_sideband_msg_tx *txmsg; 1545 int ret; 1546 1547 WARN_ON(!mutex_is_locked(&mgr->qlock)); 1548 1549 /* construct a chunk from the first msg in the tx_msg queue */ 1550 if (list_empty(&mgr->tx_msg_downq)) 1551 return; 1552 1553 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); 1554 ret = process_single_tx_qlock(mgr, txmsg, false); 1555 if (ret == 1) { 1556 /* txmsg is sent it should be in the slots now */ 1557 list_del(&txmsg->next); 1558 } else if (ret) { 1559 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); 1560 list_del(&txmsg->next); 1561 if (txmsg->seqno != -1) 1562 txmsg->dst->tx_slots[txmsg->seqno] = NULL; 1563 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; 1564 wake_up_all(&mgr->tx_waitq); 1565 } 1566 } 1567 1568 /* called holding qlock */ 1569 static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, 1570 struct drm_dp_sideband_msg_tx *txmsg) 1571 { 1572 int ret; 1573 1574 /* construct a chunk from the first msg in the tx_msg queue */ 1575 ret = process_single_tx_qlock(mgr, txmsg, true); 1576 1577 if (ret != 1) 1578 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); 1579 1580 txmsg->dst->tx_slots[txmsg->seqno] = NULL; 1581 } 1582 1583 static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, 1584 struct drm_dp_sideband_msg_tx *txmsg) 1585 { 1586 mutex_lock(&mgr->qlock); 1587 list_add_tail(&txmsg->next, &mgr->tx_msg_downq); 1588 if (list_is_singular(&mgr->tx_msg_downq)) 1589 process_single_down_tx_qlock(mgr); 1590 mutex_unlock(&mgr->qlock); 1591 } 1592 1593 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, 1594 struct drm_dp_mst_branch *mstb) 1595 { 1596 int len; 1597 struct drm_dp_sideband_msg_tx *txmsg; 1598 int ret; 1599 1600 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1601 if (!txmsg) 1602 return; 1603 1604 txmsg->dst = mstb; 1605 len = build_link_address(txmsg); 1606 1607 mstb->link_address_sent = true; 1608 drm_dp_queue_down_tx(mgr, txmsg); 1609 1610 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1611 if (ret > 0) { 1612 int i; 1613 1614 if (txmsg->reply.reply_type == 1) 1615 DRM_DEBUG_KMS("link address nak received\n"); 1616 else { 1617 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); 1618 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { 1619 DRM_DEBUG_KMS("port %d: input %d, pdt: %d, pn: %d, dpcd_rev: %02x, mcs: %d, ddps: %d, ldps %d, sdp %d/%d\n", i, 1620 txmsg->reply.u.link_addr.ports[i].input_port, 1621 txmsg->reply.u.link_addr.ports[i].peer_device_type, 1622 txmsg->reply.u.link_addr.ports[i].port_number, 1623 txmsg->reply.u.link_addr.ports[i].dpcd_revision, 1624 txmsg->reply.u.link_addr.ports[i].mcs, 1625 txmsg->reply.u.link_addr.ports[i].ddps, 1626 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, 1627 txmsg->reply.u.link_addr.ports[i].num_sdp_streams, 1628 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); 1629 } 1630 1631 drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid); 1632 1633 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { 1634 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); 1635 } 1636 (*mgr->cbs->hotplug)(mgr); 1637 } 1638 } else { 1639 mstb->link_address_sent = false; 1640 DRM_DEBUG_KMS("link address failed %d\n", ret); 1641 } 1642 1643 kfree(txmsg); 1644 } 1645 1646 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, 1647 struct drm_dp_mst_branch *mstb, 1648 struct drm_dp_mst_port *port) 1649 { 1650 int len; 1651 struct drm_dp_sideband_msg_tx *txmsg; 1652 int ret; 1653 1654 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1655 if (!txmsg) 1656 return -ENOMEM; 1657 1658 txmsg->dst = mstb; 1659 len = build_enum_path_resources(txmsg, port->port_num); 1660 1661 drm_dp_queue_down_tx(mgr, txmsg); 1662 1663 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1664 if (ret > 0) { 1665 if (txmsg->reply.reply_type == 1) 1666 DRM_DEBUG_KMS("enum path resources nak received\n"); 1667 else { 1668 if (port->port_num != txmsg->reply.u.path_resources.port_number) 1669 DRM_ERROR("got incorrect port in response\n"); 1670 DRM_DEBUG_KMS("enum path resources %d: %d %d\n", txmsg->reply.u.path_resources.port_number, txmsg->reply.u.path_resources.full_payload_bw_number, 1671 txmsg->reply.u.path_resources.avail_payload_bw_number); 1672 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; 1673 } 1674 } 1675 1676 kfree(txmsg); 1677 return 0; 1678 } 1679 1680 static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) 1681 { 1682 if (!mstb->port_parent) 1683 return NULL; 1684 1685 if (mstb->port_parent->mstb != mstb) 1686 return mstb->port_parent; 1687 1688 return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); 1689 } 1690 1691 static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, 1692 struct drm_dp_mst_branch *mstb, 1693 int *port_num) 1694 { 1695 struct drm_dp_mst_branch *rmstb = NULL; 1696 struct drm_dp_mst_port *found_port; 1697 mutex_lock(&mgr->lock); 1698 if (mgr->mst_primary) { 1699 found_port = drm_dp_get_last_connected_port_to_mstb(mstb); 1700 1701 if (found_port) { 1702 rmstb = found_port->parent; 1703 kref_get(&rmstb->kref); 1704 *port_num = found_port->port_num; 1705 } 1706 } 1707 mutex_unlock(&mgr->lock); 1708 return rmstb; 1709 } 1710 1711 static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, 1712 struct drm_dp_mst_port *port, 1713 int id, 1714 int pbn) 1715 { 1716 struct drm_dp_sideband_msg_tx *txmsg; 1717 struct drm_dp_mst_branch *mstb; 1718 int len, ret, port_num; 1719 u8 sinks[DRM_DP_MAX_SDP_STREAMS]; 1720 int i; 1721 1722 port = drm_dp_get_validated_port_ref(mgr, port); 1723 if (!port) 1724 return -EINVAL; 1725 1726 port_num = port->port_num; 1727 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); 1728 if (!mstb) { 1729 mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num); 1730 1731 if (!mstb) { 1732 drm_dp_put_port(port); 1733 return -EINVAL; 1734 } 1735 } 1736 1737 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1738 if (!txmsg) { 1739 ret = -ENOMEM; 1740 goto fail_put; 1741 } 1742 1743 for (i = 0; i < port->num_sdp_streams; i++) 1744 sinks[i] = i; 1745 1746 txmsg->dst = mstb; 1747 len = build_allocate_payload(txmsg, port_num, 1748 id, 1749 pbn, port->num_sdp_streams, sinks); 1750 1751 drm_dp_queue_down_tx(mgr, txmsg); 1752 1753 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1754 if (ret > 0) { 1755 if (txmsg->reply.reply_type == 1) { 1756 ret = -EINVAL; 1757 } else 1758 ret = 0; 1759 } 1760 kfree(txmsg); 1761 fail_put: 1762 drm_dp_put_mst_branch_device(mstb); 1763 drm_dp_put_port(port); 1764 return ret; 1765 } 1766 1767 int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, 1768 struct drm_dp_mst_port *port, bool power_up) 1769 { 1770 struct drm_dp_sideband_msg_tx *txmsg; 1771 int len, ret; 1772 1773 port = drm_dp_get_validated_port_ref(mgr, port); 1774 if (!port) 1775 return -EINVAL; 1776 1777 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1778 if (!txmsg) { 1779 drm_dp_put_port(port); 1780 return -ENOMEM; 1781 } 1782 1783 txmsg->dst = port->parent; 1784 len = build_power_updown_phy(txmsg, port->port_num, power_up); 1785 drm_dp_queue_down_tx(mgr, txmsg); 1786 1787 ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg); 1788 if (ret > 0) { 1789 if (txmsg->reply.reply_type == 1) 1790 ret = -EINVAL; 1791 else 1792 ret = 0; 1793 } 1794 kfree(txmsg); 1795 drm_dp_put_port(port); 1796 1797 return ret; 1798 } 1799 EXPORT_SYMBOL(drm_dp_send_power_updown_phy); 1800 1801 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, 1802 int id, 1803 struct drm_dp_payload *payload) 1804 { 1805 int ret; 1806 1807 ret = drm_dp_dpcd_write_payload(mgr, id, payload); 1808 if (ret < 0) { 1809 payload->payload_state = 0; 1810 return ret; 1811 } 1812 payload->payload_state = DP_PAYLOAD_LOCAL; 1813 return 0; 1814 } 1815 1816 static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, 1817 struct drm_dp_mst_port *port, 1818 int id, 1819 struct drm_dp_payload *payload) 1820 { 1821 int ret; 1822 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); 1823 if (ret < 0) 1824 return ret; 1825 payload->payload_state = DP_PAYLOAD_REMOTE; 1826 return ret; 1827 } 1828 1829 static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, 1830 struct drm_dp_mst_port *port, 1831 int id, 1832 struct drm_dp_payload *payload) 1833 { 1834 DRM_DEBUG_KMS("\n"); 1835 /* its okay for these to fail */ 1836 if (port) { 1837 drm_dp_payload_send_msg(mgr, port, id, 0); 1838 } 1839 1840 drm_dp_dpcd_write_payload(mgr, id, payload); 1841 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; 1842 return 0; 1843 } 1844 1845 static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, 1846 int id, 1847 struct drm_dp_payload *payload) 1848 { 1849 payload->payload_state = 0; 1850 return 0; 1851 } 1852 1853 /** 1854 * drm_dp_update_payload_part1() - Execute payload update part 1 1855 * @mgr: manager to use. 1856 * 1857 * This iterates over all proposed virtual channels, and tries to 1858 * allocate space in the link for them. For 0->slots transitions, 1859 * this step just writes the VCPI to the MST device. For slots->0 1860 * transitions, this writes the updated VCPIs and removes the 1861 * remote VC payloads. 1862 * 1863 * after calling this the driver should generate ACT and payload 1864 * packets. 1865 */ 1866 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) 1867 { 1868 int i, j; 1869 int cur_slots = 1; 1870 struct drm_dp_payload req_payload; 1871 struct drm_dp_mst_port *port; 1872 1873 mutex_lock(&mgr->payload_lock); 1874 for (i = 0; i < mgr->max_payloads; i++) { 1875 /* solve the current payloads - compare to the hw ones 1876 - update the hw view */ 1877 req_payload.start_slot = cur_slots; 1878 if (mgr->proposed_vcpis[i]) { 1879 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); 1880 port = drm_dp_get_validated_port_ref(mgr, port); 1881 if (!port) { 1882 mutex_unlock(&mgr->payload_lock); 1883 return -EINVAL; 1884 } 1885 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; 1886 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi; 1887 } else { 1888 port = NULL; 1889 req_payload.num_slots = 0; 1890 } 1891 1892 if (mgr->payloads[i].start_slot != req_payload.start_slot) { 1893 mgr->payloads[i].start_slot = req_payload.start_slot; 1894 } 1895 /* work out what is required to happen with this payload */ 1896 if (mgr->payloads[i].num_slots != req_payload.num_slots) { 1897 1898 /* need to push an update for this payload */ 1899 if (req_payload.num_slots) { 1900 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload); 1901 mgr->payloads[i].num_slots = req_payload.num_slots; 1902 mgr->payloads[i].vcpi = req_payload.vcpi; 1903 } else if (mgr->payloads[i].num_slots) { 1904 mgr->payloads[i].num_slots = 0; 1905 drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]); 1906 req_payload.payload_state = mgr->payloads[i].payload_state; 1907 mgr->payloads[i].start_slot = 0; 1908 } 1909 mgr->payloads[i].payload_state = req_payload.payload_state; 1910 } 1911 cur_slots += req_payload.num_slots; 1912 1913 if (port) 1914 drm_dp_put_port(port); 1915 } 1916 1917 for (i = 0; i < mgr->max_payloads; i++) { 1918 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { 1919 DRM_DEBUG_KMS("removing payload %d\n", i); 1920 for (j = i; j < mgr->max_payloads - 1; j++) { 1921 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload)); 1922 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; 1923 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) { 1924 set_bit(j + 1, &mgr->payload_mask); 1925 } else { 1926 clear_bit(j + 1, &mgr->payload_mask); 1927 } 1928 } 1929 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload)); 1930 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; 1931 clear_bit(mgr->max_payloads, &mgr->payload_mask); 1932 1933 } 1934 } 1935 mutex_unlock(&mgr->payload_lock); 1936 1937 return 0; 1938 } 1939 EXPORT_SYMBOL(drm_dp_update_payload_part1); 1940 1941 /** 1942 * drm_dp_update_payload_part2() - Execute payload update part 2 1943 * @mgr: manager to use. 1944 * 1945 * This iterates over all proposed virtual channels, and tries to 1946 * allocate space in the link for them. For 0->slots transitions, 1947 * this step writes the remote VC payload commands. For slots->0 1948 * this just resets some internal state. 1949 */ 1950 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) 1951 { 1952 struct drm_dp_mst_port *port; 1953 int i; 1954 int ret = 0; 1955 mutex_lock(&mgr->payload_lock); 1956 for (i = 0; i < mgr->max_payloads; i++) { 1957 1958 if (!mgr->proposed_vcpis[i]) 1959 continue; 1960 1961 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); 1962 1963 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); 1964 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { 1965 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); 1966 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { 1967 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); 1968 } 1969 if (ret) { 1970 mutex_unlock(&mgr->payload_lock); 1971 return ret; 1972 } 1973 } 1974 mutex_unlock(&mgr->payload_lock); 1975 return 0; 1976 } 1977 EXPORT_SYMBOL(drm_dp_update_payload_part2); 1978 1979 #if 0 /* unused as of yet */ 1980 static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, 1981 struct drm_dp_mst_port *port, 1982 int offset, int size) 1983 { 1984 int len; 1985 struct drm_dp_sideband_msg_tx *txmsg; 1986 1987 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1988 if (!txmsg) 1989 return -ENOMEM; 1990 1991 len = build_dpcd_read(txmsg, port->port_num, 0, 8); 1992 txmsg->dst = port->parent; 1993 1994 drm_dp_queue_down_tx(mgr, txmsg); 1995 1996 return 0; 1997 } 1998 #endif 1999 2000 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, 2001 struct drm_dp_mst_port *port, 2002 int offset, int size, u8 *bytes) 2003 { 2004 int len; 2005 int ret; 2006 struct drm_dp_sideband_msg_tx *txmsg; 2007 struct drm_dp_mst_branch *mstb; 2008 2009 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); 2010 if (!mstb) 2011 return -EINVAL; 2012 2013 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 2014 if (!txmsg) { 2015 ret = -ENOMEM; 2016 goto fail_put; 2017 } 2018 2019 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); 2020 txmsg->dst = mstb; 2021 2022 drm_dp_queue_down_tx(mgr, txmsg); 2023 2024 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 2025 if (ret > 0) { 2026 if (txmsg->reply.reply_type == 1) { 2027 ret = -EINVAL; 2028 } else 2029 ret = 0; 2030 } 2031 kfree(txmsg); 2032 fail_put: 2033 drm_dp_put_mst_branch_device(mstb); 2034 return ret; 2035 } 2036 2037 static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) 2038 { 2039 struct drm_dp_sideband_msg_reply_body reply; 2040 2041 reply.reply_type = 0; 2042 reply.req_type = req_type; 2043 drm_dp_encode_sideband_reply(&reply, msg); 2044 return 0; 2045 } 2046 2047 static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, 2048 struct drm_dp_mst_branch *mstb, 2049 int req_type, int seqno, bool broadcast) 2050 { 2051 struct drm_dp_sideband_msg_tx *txmsg; 2052 2053 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 2054 if (!txmsg) 2055 return -ENOMEM; 2056 2057 txmsg->dst = mstb; 2058 txmsg->seqno = seqno; 2059 drm_dp_encode_up_ack_reply(txmsg, req_type); 2060 2061 mutex_lock(&mgr->qlock); 2062 2063 process_single_up_tx_qlock(mgr, txmsg); 2064 2065 mutex_unlock(&mgr->qlock); 2066 2067 kfree(txmsg); 2068 return 0; 2069 } 2070 2071 static bool drm_dp_get_vc_payload_bw(int dp_link_bw, 2072 int dp_link_count, 2073 int *out) 2074 { 2075 switch (dp_link_bw) { 2076 default: 2077 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n", 2078 dp_link_bw, dp_link_count); 2079 return false; 2080 2081 case DP_LINK_BW_1_62: 2082 *out = 3 * dp_link_count; 2083 break; 2084 case DP_LINK_BW_2_7: 2085 *out = 5 * dp_link_count; 2086 break; 2087 case DP_LINK_BW_5_4: 2088 *out = 10 * dp_link_count; 2089 break; 2090 } 2091 return true; 2092 } 2093 2094 /** 2095 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager 2096 * @mgr: manager to set state for 2097 * @mst_state: true to enable MST on this connector - false to disable. 2098 * 2099 * This is called by the driver when it detects an MST capable device plugged 2100 * into a DP MST capable port, or when a DP MST capable device is unplugged. 2101 */ 2102 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) 2103 { 2104 int ret = 0; 2105 struct drm_dp_mst_branch *mstb = NULL; 2106 2107 mutex_lock(&mgr->lock); 2108 if (mst_state == mgr->mst_state) 2109 goto out_unlock; 2110 2111 mgr->mst_state = mst_state; 2112 /* set the device into MST mode */ 2113 if (mst_state) { 2114 WARN_ON(mgr->mst_primary); 2115 2116 /* get dpcd info */ 2117 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); 2118 if (ret != DP_RECEIVER_CAP_SIZE) { 2119 DRM_DEBUG_KMS("failed to read DPCD\n"); 2120 goto out_unlock; 2121 } 2122 2123 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1], 2124 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, 2125 &mgr->pbn_div)) { 2126 ret = -EINVAL; 2127 goto out_unlock; 2128 } 2129 2130 /* add initial branch device at LCT 1 */ 2131 mstb = drm_dp_add_mst_branch_device(1, NULL); 2132 if (mstb == NULL) { 2133 ret = -ENOMEM; 2134 goto out_unlock; 2135 } 2136 mstb->mgr = mgr; 2137 2138 /* give this the main reference */ 2139 mgr->mst_primary = mstb; 2140 kref_get(&mgr->mst_primary->kref); 2141 2142 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 2143 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); 2144 if (ret < 0) { 2145 goto out_unlock; 2146 } 2147 2148 { 2149 struct drm_dp_payload reset_pay; 2150 reset_pay.start_slot = 0; 2151 reset_pay.num_slots = 0x3f; 2152 drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); 2153 } 2154 2155 queue_work(system_long_wq, &mgr->work); 2156 2157 ret = 0; 2158 } else { 2159 /* disable MST on the device */ 2160 mstb = mgr->mst_primary; 2161 mgr->mst_primary = NULL; 2162 /* this can fail if the device is gone */ 2163 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); 2164 ret = 0; 2165 memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); 2166 mgr->payload_mask = 0; 2167 set_bit(0, &mgr->payload_mask); 2168 mgr->vcpi_mask = 0; 2169 } 2170 2171 out_unlock: 2172 mutex_unlock(&mgr->lock); 2173 if (mstb) 2174 drm_dp_put_mst_branch_device(mstb); 2175 return ret; 2176 2177 } 2178 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); 2179 2180 /** 2181 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager 2182 * @mgr: manager to suspend 2183 * 2184 * This function tells the MST device that we can't handle UP messages 2185 * anymore. This should stop it from sending any since we are suspended. 2186 */ 2187 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) 2188 { 2189 mutex_lock(&mgr->lock); 2190 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 2191 DP_MST_EN | DP_UPSTREAM_IS_SRC); 2192 mutex_unlock(&mgr->lock); 2193 flush_work(&mgr->work); 2194 flush_work(&mgr->destroy_connector_work); 2195 } 2196 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); 2197 2198 /** 2199 * drm_dp_mst_topology_mgr_resume() - resume the MST manager 2200 * @mgr: manager to resume 2201 * 2202 * This will fetch DPCD and see if the device is still there, 2203 * if it is, it will rewrite the MSTM control bits, and return. 2204 * 2205 * if the device fails this returns -1, and the driver should do 2206 * a full MST reprobe, in case we were undocked. 2207 */ 2208 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) 2209 { 2210 int ret = 0; 2211 2212 mutex_lock(&mgr->lock); 2213 2214 if (mgr->mst_primary) { 2215 int sret; 2216 u8 guid[16]; 2217 2218 sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); 2219 if (sret != DP_RECEIVER_CAP_SIZE) { 2220 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); 2221 ret = -1; 2222 goto out_unlock; 2223 } 2224 2225 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 2226 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); 2227 if (ret < 0) { 2228 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); 2229 ret = -1; 2230 goto out_unlock; 2231 } 2232 2233 /* Some hubs forget their guids after they resume */ 2234 sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); 2235 if (sret != 16) { 2236 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); 2237 ret = -1; 2238 goto out_unlock; 2239 } 2240 drm_dp_check_mstb_guid(mgr->mst_primary, guid); 2241 2242 ret = 0; 2243 } else 2244 ret = -1; 2245 2246 out_unlock: 2247 mutex_unlock(&mgr->lock); 2248 return ret; 2249 } 2250 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); 2251 2252 static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) 2253 { 2254 int len; 2255 u8 replyblock[32]; 2256 int replylen, origlen, curreply; 2257 int ret; 2258 struct drm_dp_sideband_msg_rx *msg; 2259 int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; 2260 msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; 2261 2262 len = min(mgr->max_dpcd_transaction_bytes, 16); 2263 ret = drm_dp_dpcd_read(mgr->aux, basereg, 2264 replyblock, len); 2265 if (ret != len) { 2266 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); 2267 return false; 2268 } 2269 ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); 2270 if (!ret) { 2271 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); 2272 return false; 2273 } 2274 replylen = msg->curchunk_len + msg->curchunk_hdrlen; 2275 2276 origlen = replylen; 2277 replylen -= len; 2278 curreply = len; 2279 while (replylen > 0) { 2280 len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); 2281 ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, 2282 replyblock, len); 2283 if (ret != len) { 2284 DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n", 2285 len, ret); 2286 return false; 2287 } 2288 2289 ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); 2290 if (!ret) { 2291 DRM_DEBUG_KMS("failed to build sideband msg\n"); 2292 return false; 2293 } 2294 2295 curreply += len; 2296 replylen -= len; 2297 } 2298 return true; 2299 } 2300 2301 static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) 2302 { 2303 int ret = 0; 2304 2305 if (!drm_dp_get_one_sb_msg(mgr, false)) { 2306 memset(&mgr->down_rep_recv, 0, 2307 sizeof(struct drm_dp_sideband_msg_rx)); 2308 return 0; 2309 } 2310 2311 if (mgr->down_rep_recv.have_eomt) { 2312 struct drm_dp_sideband_msg_tx *txmsg; 2313 struct drm_dp_mst_branch *mstb; 2314 int slot = -1; 2315 mstb = drm_dp_get_mst_branch_device(mgr, 2316 mgr->down_rep_recv.initial_hdr.lct, 2317 mgr->down_rep_recv.initial_hdr.rad); 2318 2319 if (!mstb) { 2320 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); 2321 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2322 return 0; 2323 } 2324 2325 /* find the message */ 2326 slot = mgr->down_rep_recv.initial_hdr.seqno; 2327 mutex_lock(&mgr->qlock); 2328 txmsg = mstb->tx_slots[slot]; 2329 /* remove from slots */ 2330 mutex_unlock(&mgr->qlock); 2331 2332 if (!txmsg) { 2333 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", 2334 mstb, 2335 mgr->down_rep_recv.initial_hdr.seqno, 2336 mgr->down_rep_recv.initial_hdr.lct, 2337 mgr->down_rep_recv.initial_hdr.rad[0], 2338 mgr->down_rep_recv.msg[0]); 2339 drm_dp_put_mst_branch_device(mstb); 2340 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2341 return 0; 2342 } 2343 2344 drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); 2345 if (txmsg->reply.reply_type == 1) { 2346 DRM_DEBUG_KMS("Got NAK reply: req 0x%02x, reason 0x%02x, nak data 0x%02x\n", txmsg->reply.req_type, txmsg->reply.u.nak.reason, txmsg->reply.u.nak.nak_data); 2347 } 2348 2349 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2350 drm_dp_put_mst_branch_device(mstb); 2351 2352 mutex_lock(&mgr->qlock); 2353 txmsg->state = DRM_DP_SIDEBAND_TX_RX; 2354 mstb->tx_slots[slot] = NULL; 2355 mutex_unlock(&mgr->qlock); 2356 2357 wake_up_all(&mgr->tx_waitq); 2358 } 2359 return ret; 2360 } 2361 2362 static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) 2363 { 2364 int ret = 0; 2365 2366 if (!drm_dp_get_one_sb_msg(mgr, true)) { 2367 memset(&mgr->up_req_recv, 0, 2368 sizeof(struct drm_dp_sideband_msg_rx)); 2369 return 0; 2370 } 2371 2372 if (mgr->up_req_recv.have_eomt) { 2373 struct drm_dp_sideband_msg_req_body msg; 2374 struct drm_dp_mst_branch *mstb = NULL; 2375 bool seqno; 2376 2377 if (!mgr->up_req_recv.initial_hdr.broadcast) { 2378 mstb = drm_dp_get_mst_branch_device(mgr, 2379 mgr->up_req_recv.initial_hdr.lct, 2380 mgr->up_req_recv.initial_hdr.rad); 2381 if (!mstb) { 2382 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); 2383 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2384 return 0; 2385 } 2386 } 2387 2388 seqno = mgr->up_req_recv.initial_hdr.seqno; 2389 drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); 2390 2391 if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { 2392 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); 2393 2394 if (!mstb) 2395 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid); 2396 2397 if (!mstb) { 2398 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); 2399 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2400 return 0; 2401 } 2402 2403 drm_dp_update_port(mstb, &msg.u.conn_stat); 2404 2405 DRM_DEBUG_KMS("Got CSN: pn: %d ldps:%d ddps: %d mcs: %d ip: %d pdt: %d\n", msg.u.conn_stat.port_number, msg.u.conn_stat.legacy_device_plug_status, msg.u.conn_stat.displayport_device_plug_status, msg.u.conn_stat.message_capability_status, msg.u.conn_stat.input_port, msg.u.conn_stat.peer_device_type); 2406 (*mgr->cbs->hotplug)(mgr); 2407 2408 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { 2409 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); 2410 if (!mstb) 2411 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid); 2412 2413 if (!mstb) { 2414 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); 2415 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2416 return 0; 2417 } 2418 2419 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); 2420 } 2421 2422 if (mstb) 2423 drm_dp_put_mst_branch_device(mstb); 2424 2425 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2426 } 2427 return ret; 2428 } 2429 2430 /** 2431 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify 2432 * @mgr: manager to notify irq for. 2433 * @esi: 4 bytes from SINK_COUNT_ESI 2434 * @handled: whether the hpd interrupt was consumed or not 2435 * 2436 * This should be called from the driver when it detects a short IRQ, 2437 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The 2438 * topology manager will process the sideband messages received as a result 2439 * of this. 2440 */ 2441 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) 2442 { 2443 int ret = 0; 2444 int sc; 2445 *handled = false; 2446 sc = esi[0] & 0x3f; 2447 2448 if (sc != mgr->sink_count) { 2449 mgr->sink_count = sc; 2450 *handled = true; 2451 } 2452 2453 if (esi[1] & DP_DOWN_REP_MSG_RDY) { 2454 ret = drm_dp_mst_handle_down_rep(mgr); 2455 *handled = true; 2456 } 2457 2458 if (esi[1] & DP_UP_REQ_MSG_RDY) { 2459 ret |= drm_dp_mst_handle_up_req(mgr); 2460 *handled = true; 2461 } 2462 2463 drm_dp_mst_kick_tx(mgr); 2464 return ret; 2465 } 2466 EXPORT_SYMBOL(drm_dp_mst_hpd_irq); 2467 2468 /** 2469 * drm_dp_mst_detect_port() - get connection status for an MST port 2470 * @connector: DRM connector for this port 2471 * @mgr: manager for this port 2472 * @port: unverified pointer to a port 2473 * 2474 * This returns the current connection state for a port. It validates the 2475 * port pointer still exists so the caller doesn't require a reference 2476 */ 2477 enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, 2478 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2479 { 2480 enum drm_connector_status status = connector_status_disconnected; 2481 2482 /* we need to search for the port in the mgr in case its gone */ 2483 port = drm_dp_get_validated_port_ref(mgr, port); 2484 if (!port) 2485 return connector_status_disconnected; 2486 2487 if (!port->ddps) 2488 goto out; 2489 2490 switch (port->pdt) { 2491 case DP_PEER_DEVICE_NONE: 2492 case DP_PEER_DEVICE_MST_BRANCHING: 2493 break; 2494 2495 case DP_PEER_DEVICE_SST_SINK: 2496 status = connector_status_connected; 2497 /* for logical ports - cache the EDID */ 2498 if (port->port_num >= 8 && !port->cached_edid) { 2499 port->cached_edid = drm_get_edid(connector, &port->aux.ddc); 2500 } 2501 break; 2502 case DP_PEER_DEVICE_DP_LEGACY_CONV: 2503 if (port->ldps) 2504 status = connector_status_connected; 2505 break; 2506 } 2507 out: 2508 drm_dp_put_port(port); 2509 return status; 2510 } 2511 EXPORT_SYMBOL(drm_dp_mst_detect_port); 2512 2513 /** 2514 * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not 2515 * @mgr: manager for this port 2516 * @port: unverified pointer to a port. 2517 * 2518 * This returns whether the port supports audio or not. 2519 */ 2520 bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr, 2521 struct drm_dp_mst_port *port) 2522 { 2523 bool ret = false; 2524 2525 port = drm_dp_get_validated_port_ref(mgr, port); 2526 if (!port) 2527 return ret; 2528 ret = port->has_audio; 2529 drm_dp_put_port(port); 2530 return ret; 2531 } 2532 EXPORT_SYMBOL(drm_dp_mst_port_has_audio); 2533 2534 /** 2535 * drm_dp_mst_get_edid() - get EDID for an MST port 2536 * @connector: toplevel connector to get EDID for 2537 * @mgr: manager for this port 2538 * @port: unverified pointer to a port. 2539 * 2540 * This returns an EDID for the port connected to a connector, 2541 * It validates the pointer still exists so the caller doesn't require a 2542 * reference. 2543 */ 2544 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2545 { 2546 struct edid *edid = NULL; 2547 2548 /* we need to search for the port in the mgr in case its gone */ 2549 port = drm_dp_get_validated_port_ref(mgr, port); 2550 if (!port) 2551 return NULL; 2552 2553 if (port->cached_edid) 2554 edid = drm_edid_duplicate(port->cached_edid); 2555 else { 2556 edid = drm_get_edid(connector, &port->aux.ddc); 2557 drm_mode_connector_set_tile_property(connector); 2558 } 2559 port->has_audio = drm_detect_monitor_audio(edid); 2560 drm_dp_put_port(port); 2561 return edid; 2562 } 2563 EXPORT_SYMBOL(drm_dp_mst_get_edid); 2564 2565 /** 2566 * drm_dp_find_vcpi_slots() - find slots for this PBN value 2567 * @mgr: manager to use 2568 * @pbn: payload bandwidth to convert into slots. 2569 */ 2570 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, 2571 int pbn) 2572 { 2573 int num_slots; 2574 2575 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); 2576 2577 /* max. time slots - one slot for MTP header */ 2578 if (num_slots > 63) 2579 return -ENOSPC; 2580 return num_slots; 2581 } 2582 EXPORT_SYMBOL(drm_dp_find_vcpi_slots); 2583 2584 static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, 2585 struct drm_dp_vcpi *vcpi, int pbn, int slots) 2586 { 2587 int ret; 2588 2589 /* max. time slots - one slot for MTP header */ 2590 if (slots > 63) 2591 return -ENOSPC; 2592 2593 vcpi->pbn = pbn; 2594 vcpi->aligned_pbn = slots * mgr->pbn_div; 2595 vcpi->num_slots = slots; 2596 2597 ret = drm_dp_mst_assign_payload_id(mgr, vcpi); 2598 if (ret < 0) 2599 return ret; 2600 return 0; 2601 } 2602 2603 /** 2604 * drm_dp_atomic_find_vcpi_slots() - Find and add vcpi slots to the state 2605 * @state: global atomic state 2606 * @mgr: MST topology manager for the port 2607 * @port: port to find vcpi slots for 2608 * @pbn: bandwidth required for the mode in PBN 2609 * 2610 * RETURNS: 2611 * Total slots in the atomic state assigned for this port or error 2612 */ 2613 int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state, 2614 struct drm_dp_mst_topology_mgr *mgr, 2615 struct drm_dp_mst_port *port, int pbn) 2616 { 2617 struct drm_dp_mst_topology_state *topology_state; 2618 int req_slots; 2619 2620 topology_state = drm_atomic_get_mst_topology_state(state, mgr); 2621 if (IS_ERR(topology_state)) 2622 return PTR_ERR(topology_state); 2623 2624 port = drm_dp_get_validated_port_ref(mgr, port); 2625 if (port == NULL) 2626 return -EINVAL; 2627 req_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); 2628 DRM_DEBUG_KMS("vcpi slots req=%d, avail=%d\n", 2629 req_slots, topology_state->avail_slots); 2630 2631 if (req_slots > topology_state->avail_slots) { 2632 drm_dp_put_port(port); 2633 return -ENOSPC; 2634 } 2635 2636 topology_state->avail_slots -= req_slots; 2637 DRM_DEBUG_KMS("vcpi slots avail=%d", topology_state->avail_slots); 2638 2639 drm_dp_put_port(port); 2640 return req_slots; 2641 } 2642 EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots); 2643 2644 /** 2645 * drm_dp_atomic_release_vcpi_slots() - Release allocated vcpi slots 2646 * @state: global atomic state 2647 * @mgr: MST topology manager for the port 2648 * @slots: number of vcpi slots to release 2649 * 2650 * RETURNS: 2651 * 0 if @slots were added back to &drm_dp_mst_topology_state->avail_slots or 2652 * negative error code 2653 */ 2654 int drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state, 2655 struct drm_dp_mst_topology_mgr *mgr, 2656 int slots) 2657 { 2658 struct drm_dp_mst_topology_state *topology_state; 2659 2660 topology_state = drm_atomic_get_mst_topology_state(state, mgr); 2661 if (IS_ERR(topology_state)) 2662 return PTR_ERR(topology_state); 2663 2664 /* We cannot rely on port->vcpi.num_slots to update 2665 * topology_state->avail_slots as the port may not exist if the parent 2666 * branch device was unplugged. This should be fixed by tracking 2667 * per-port slot allocation in drm_dp_mst_topology_state instead of 2668 * depending on the caller to tell us how many slots to release. 2669 */ 2670 topology_state->avail_slots += slots; 2671 DRM_DEBUG_KMS("vcpi slots released=%d, avail=%d\n", 2672 slots, topology_state->avail_slots); 2673 2674 return 0; 2675 } 2676 EXPORT_SYMBOL(drm_dp_atomic_release_vcpi_slots); 2677 2678 /** 2679 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel 2680 * @mgr: manager for this port 2681 * @port: port to allocate a virtual channel for. 2682 * @pbn: payload bandwidth number to request 2683 * @slots: returned number of slots for this PBN. 2684 */ 2685 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, 2686 struct drm_dp_mst_port *port, int pbn, int slots) 2687 { 2688 int ret; 2689 2690 port = drm_dp_get_validated_port_ref(mgr, port); 2691 if (!port) 2692 return false; 2693 2694 if (slots < 0) 2695 return false; 2696 2697 if (port->vcpi.vcpi > 0) { 2698 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); 2699 if (pbn == port->vcpi.pbn) { 2700 drm_dp_put_port(port); 2701 return true; 2702 } 2703 } 2704 2705 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn, slots); 2706 if (ret) { 2707 DRM_DEBUG_KMS("failed to init vcpi slots=%d max=63 ret=%d\n", 2708 DIV_ROUND_UP(pbn, mgr->pbn_div), ret); 2709 goto out; 2710 } 2711 DRM_DEBUG_KMS("initing vcpi for pbn=%d slots=%d\n", 2712 pbn, port->vcpi.num_slots); 2713 2714 drm_dp_put_port(port); 2715 return true; 2716 out: 2717 return false; 2718 } 2719 EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); 2720 2721 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2722 { 2723 int slots = 0; 2724 port = drm_dp_get_validated_port_ref(mgr, port); 2725 if (!port) 2726 return slots; 2727 2728 slots = port->vcpi.num_slots; 2729 drm_dp_put_port(port); 2730 return slots; 2731 } 2732 EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots); 2733 2734 /** 2735 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI 2736 * @mgr: manager for this port 2737 * @port: unverified pointer to a port. 2738 * 2739 * This just resets the number of slots for the ports VCPI for later programming. 2740 */ 2741 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2742 { 2743 port = drm_dp_get_validated_port_ref(mgr, port); 2744 if (!port) 2745 return; 2746 port->vcpi.num_slots = 0; 2747 drm_dp_put_port(port); 2748 } 2749 EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); 2750 2751 /** 2752 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI 2753 * @mgr: manager for this port 2754 * @port: unverified port to deallocate vcpi for 2755 */ 2756 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2757 { 2758 port = drm_dp_get_validated_port_ref(mgr, port); 2759 if (!port) 2760 return; 2761 2762 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); 2763 port->vcpi.num_slots = 0; 2764 port->vcpi.pbn = 0; 2765 port->vcpi.aligned_pbn = 0; 2766 port->vcpi.vcpi = 0; 2767 drm_dp_put_port(port); 2768 } 2769 EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); 2770 2771 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, 2772 int id, struct drm_dp_payload *payload) 2773 { 2774 u8 payload_alloc[3], status; 2775 int ret; 2776 int retries = 0; 2777 2778 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, 2779 DP_PAYLOAD_TABLE_UPDATED); 2780 2781 payload_alloc[0] = id; 2782 payload_alloc[1] = payload->start_slot; 2783 payload_alloc[2] = payload->num_slots; 2784 2785 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); 2786 if (ret != 3) { 2787 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); 2788 goto fail; 2789 } 2790 2791 retry: 2792 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); 2793 if (ret < 0) { 2794 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); 2795 goto fail; 2796 } 2797 2798 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { 2799 retries++; 2800 if (retries < 20) { 2801 usleep_range(10000, 20000); 2802 goto retry; 2803 } 2804 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); 2805 ret = -EINVAL; 2806 goto fail; 2807 } 2808 ret = 0; 2809 fail: 2810 return ret; 2811 } 2812 2813 2814 /** 2815 * drm_dp_check_act_status() - Check ACT handled status. 2816 * @mgr: manager to use 2817 * 2818 * Check the payload status bits in the DPCD for ACT handled completion. 2819 */ 2820 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) 2821 { 2822 u8 status; 2823 int ret; 2824 int count = 0; 2825 2826 do { 2827 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); 2828 2829 if (ret < 0) { 2830 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); 2831 goto fail; 2832 } 2833 2834 if (status & DP_PAYLOAD_ACT_HANDLED) 2835 break; 2836 count++; 2837 udelay(100); 2838 2839 } while (count < 30); 2840 2841 if (!(status & DP_PAYLOAD_ACT_HANDLED)) { 2842 DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); 2843 ret = -EINVAL; 2844 goto fail; 2845 } 2846 return 0; 2847 fail: 2848 return ret; 2849 } 2850 EXPORT_SYMBOL(drm_dp_check_act_status); 2851 2852 /** 2853 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. 2854 * @clock: dot clock for the mode 2855 * @bpp: bpp for the mode. 2856 * 2857 * This uses the formula in the spec to calculate the PBN value for a mode. 2858 */ 2859 int drm_dp_calc_pbn_mode(int clock, int bpp) 2860 { 2861 u64 kbps; 2862 s64 peak_kbps; 2863 u32 numerator; 2864 u32 denominator; 2865 2866 kbps = clock * bpp; 2867 2868 /* 2869 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006 2870 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on 2871 * common multiplier to render an integer PBN for all link rate/lane 2872 * counts combinations 2873 * calculate 2874 * peak_kbps *= (1006/1000) 2875 * peak_kbps *= (64/54) 2876 * peak_kbps *= 8 convert to bytes 2877 */ 2878 2879 numerator = 64 * 1006; 2880 denominator = 54 * 8 * 1000 * 1000; 2881 2882 kbps *= numerator; 2883 peak_kbps = drm_fixp_from_fraction(kbps, denominator); 2884 2885 return drm_fixp2int_ceil(peak_kbps); 2886 } 2887 EXPORT_SYMBOL(drm_dp_calc_pbn_mode); 2888 2889 static int test_calc_pbn_mode(void) 2890 { 2891 int ret; 2892 ret = drm_dp_calc_pbn_mode(154000, 30); 2893 if (ret != 689) { 2894 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", 2895 154000, 30, 689, ret); 2896 return -EINVAL; 2897 } 2898 ret = drm_dp_calc_pbn_mode(234000, 30); 2899 if (ret != 1047) { 2900 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", 2901 234000, 30, 1047, ret); 2902 return -EINVAL; 2903 } 2904 ret = drm_dp_calc_pbn_mode(297000, 24); 2905 if (ret != 1063) { 2906 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", 2907 297000, 24, 1063, ret); 2908 return -EINVAL; 2909 } 2910 return 0; 2911 } 2912 2913 /* we want to kick the TX after we've ack the up/down IRQs. */ 2914 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) 2915 { 2916 queue_work(system_long_wq, &mgr->tx_work); 2917 } 2918 2919 static void drm_dp_mst_dump_mstb(struct seq_file *m, 2920 struct drm_dp_mst_branch *mstb) 2921 { 2922 struct drm_dp_mst_port *port; 2923 int tabs = mstb->lct; 2924 char prefix[10]; 2925 int i; 2926 2927 for (i = 0; i < tabs; i++) 2928 prefix[i] = '\t'; 2929 prefix[i] = '\0'; 2930 2931 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); 2932 list_for_each_entry(port, &mstb->ports, next) { 2933 seq_printf(m, "%sport: %d: input: %d: pdt: %d, ddps: %d ldps: %d, sdp: %d/%d, %p, conn: %p\n", prefix, port->port_num, port->input, port->pdt, port->ddps, port->ldps, port->num_sdp_streams, port->num_sdp_stream_sinks, port, port->connector); 2934 if (port->mstb) 2935 drm_dp_mst_dump_mstb(m, port->mstb); 2936 } 2937 } 2938 2939 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, 2940 char *buf) 2941 { 2942 int i; 2943 2944 for (i = 0; i < 64; i += 16) { 2945 if (drm_dp_dpcd_read(mgr->aux, 2946 DP_PAYLOAD_TABLE_UPDATE_STATUS + i, 2947 &buf[i], 16) != 16) 2948 return false; 2949 } 2950 return true; 2951 } 2952 2953 static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr, 2954 struct drm_dp_mst_port *port, char *name, 2955 int namelen) 2956 { 2957 struct edid *mst_edid; 2958 2959 mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port); 2960 drm_edid_get_monitor_name(mst_edid, name, namelen); 2961 } 2962 2963 /** 2964 * drm_dp_mst_dump_topology(): dump topology to seq file. 2965 * @m: seq_file to dump output to 2966 * @mgr: manager to dump current topology for. 2967 * 2968 * helper to dump MST topology to a seq file for debugfs. 2969 */ 2970 void drm_dp_mst_dump_topology(struct seq_file *m, 2971 struct drm_dp_mst_topology_mgr *mgr) 2972 { 2973 int i; 2974 struct drm_dp_mst_port *port; 2975 2976 mutex_lock(&mgr->lock); 2977 if (mgr->mst_primary) 2978 drm_dp_mst_dump_mstb(m, mgr->mst_primary); 2979 2980 /* dump VCPIs */ 2981 mutex_unlock(&mgr->lock); 2982 2983 mutex_lock(&mgr->payload_lock); 2984 seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask, 2985 mgr->max_payloads); 2986 2987 for (i = 0; i < mgr->max_payloads; i++) { 2988 if (mgr->proposed_vcpis[i]) { 2989 char name[14]; 2990 2991 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); 2992 fetch_monitor_name(mgr, port, name, sizeof(name)); 2993 seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i, 2994 port->port_num, port->vcpi.vcpi, 2995 port->vcpi.num_slots, 2996 (*name != 0) ? name : "Unknown"); 2997 } else 2998 seq_printf(m, "vcpi %d:unused\n", i); 2999 } 3000 for (i = 0; i < mgr->max_payloads; i++) { 3001 seq_printf(m, "payload %d: %d, %d, %d\n", 3002 i, 3003 mgr->payloads[i].payload_state, 3004 mgr->payloads[i].start_slot, 3005 mgr->payloads[i].num_slots); 3006 3007 3008 } 3009 mutex_unlock(&mgr->payload_lock); 3010 3011 mutex_lock(&mgr->lock); 3012 if (mgr->mst_primary) { 3013 u8 buf[64]; 3014 int ret; 3015 3016 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); 3017 seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf); 3018 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); 3019 seq_printf(m, "faux/mst: %*ph\n", 2, buf); 3020 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); 3021 seq_printf(m, "mst ctrl: %*ph\n", 1, buf); 3022 3023 /* dump the standard OUI branch header */ 3024 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); 3025 seq_printf(m, "branch oui: %*phN devid: ", 3, buf); 3026 for (i = 0x3; i < 0x8 && buf[i]; i++) 3027 seq_printf(m, "%c", buf[i]); 3028 seq_printf(m, " revision: hw: %x.%x sw: %x.%x\n", 3029 buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]); 3030 if (dump_dp_payload_table(mgr, buf)) 3031 seq_printf(m, "payload table: %*ph\n", 63, buf); 3032 3033 } 3034 3035 mutex_unlock(&mgr->lock); 3036 3037 } 3038 EXPORT_SYMBOL(drm_dp_mst_dump_topology); 3039 3040 static void drm_dp_tx_work(struct work_struct *work) 3041 { 3042 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); 3043 3044 mutex_lock(&mgr->qlock); 3045 if (!list_empty(&mgr->tx_msg_downq)) 3046 process_single_down_tx_qlock(mgr); 3047 mutex_unlock(&mgr->qlock); 3048 } 3049 3050 static void drm_dp_free_mst_port(struct kref *kref) 3051 { 3052 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); 3053 kref_put(&port->parent->kref, drm_dp_free_mst_branch_device); 3054 kfree(port); 3055 } 3056 3057 static void drm_dp_destroy_connector_work(struct work_struct *work) 3058 { 3059 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work); 3060 struct drm_dp_mst_port *port; 3061 bool send_hotplug = false; 3062 /* 3063 * Not a regular list traverse as we have to drop the destroy 3064 * connector lock before destroying the connector, to avoid AB->BA 3065 * ordering between this lock and the config mutex. 3066 */ 3067 for (;;) { 3068 mutex_lock(&mgr->destroy_connector_lock); 3069 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next); 3070 if (!port) { 3071 mutex_unlock(&mgr->destroy_connector_lock); 3072 break; 3073 } 3074 list_del(&port->next); 3075 mutex_unlock(&mgr->destroy_connector_lock); 3076 3077 kref_init(&port->kref); 3078 INIT_LIST_HEAD(&port->next); 3079 3080 mgr->cbs->destroy_connector(mgr, port->connector); 3081 3082 drm_dp_port_teardown_pdt(port, port->pdt); 3083 port->pdt = DP_PEER_DEVICE_NONE; 3084 3085 if (!port->input && port->vcpi.vcpi > 0) { 3086 drm_dp_mst_reset_vcpi_slots(mgr, port); 3087 drm_dp_update_payload_part1(mgr); 3088 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); 3089 } 3090 3091 kref_put(&port->kref, drm_dp_free_mst_port); 3092 send_hotplug = true; 3093 } 3094 if (send_hotplug) 3095 (*mgr->cbs->hotplug)(mgr); 3096 } 3097 3098 static struct drm_private_state * 3099 drm_dp_mst_duplicate_state(struct drm_private_obj *obj) 3100 { 3101 struct drm_dp_mst_topology_state *state; 3102 3103 state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL); 3104 if (!state) 3105 return NULL; 3106 3107 __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base); 3108 3109 return &state->base; 3110 } 3111 3112 static void drm_dp_mst_destroy_state(struct drm_private_obj *obj, 3113 struct drm_private_state *state) 3114 { 3115 struct drm_dp_mst_topology_state *mst_state = 3116 to_dp_mst_topology_state(state); 3117 3118 kfree(mst_state); 3119 } 3120 3121 static const struct drm_private_state_funcs mst_state_funcs = { 3122 .atomic_duplicate_state = drm_dp_mst_duplicate_state, 3123 .atomic_destroy_state = drm_dp_mst_destroy_state, 3124 }; 3125 3126 /** 3127 * drm_atomic_get_mst_topology_state: get MST topology state 3128 * 3129 * @state: global atomic state 3130 * @mgr: MST topology manager, also the private object in this case 3131 * 3132 * This function wraps drm_atomic_get_priv_obj_state() passing in the MST atomic 3133 * state vtable so that the private object state returned is that of a MST 3134 * topology object. Also, drm_atomic_get_private_obj_state() expects the caller 3135 * to care of the locking, so warn if don't hold the connection_mutex. 3136 * 3137 * RETURNS: 3138 * 3139 * The MST topology state or error pointer. 3140 */ 3141 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state, 3142 struct drm_dp_mst_topology_mgr *mgr) 3143 { 3144 struct drm_device *dev = mgr->dev; 3145 3146 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); 3147 return to_dp_mst_topology_state(drm_atomic_get_private_obj_state(state, &mgr->base)); 3148 } 3149 EXPORT_SYMBOL(drm_atomic_get_mst_topology_state); 3150 3151 /** 3152 * drm_dp_mst_topology_mgr_init - initialise a topology manager 3153 * @mgr: manager struct to initialise 3154 * @dev: device providing this structure - for i2c addition. 3155 * @aux: DP helper aux channel to talk to this device 3156 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit 3157 * @max_payloads: maximum number of payloads this GPU can source 3158 * @conn_base_id: the connector object ID the MST device is connected to. 3159 * 3160 * Return 0 for success, or negative error code on failure 3161 */ 3162 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, 3163 struct drm_device *dev, struct drm_dp_aux *aux, 3164 int max_dpcd_transaction_bytes, 3165 int max_payloads, int conn_base_id) 3166 { 3167 struct drm_dp_mst_topology_state *mst_state; 3168 3169 lockinit(&mgr->lock, "drmml", 0, LK_CANRECURSE); 3170 lockinit(&mgr->qlock, "drmmql", 0, LK_CANRECURSE); 3171 lockinit(&mgr->payload_lock, "drmmpl", 0, LK_CANRECURSE); 3172 lockinit(&mgr->destroy_connector_lock, "drmmdcl", 0, LK_CANRECURSE); 3173 INIT_LIST_HEAD(&mgr->tx_msg_downq); 3174 INIT_LIST_HEAD(&mgr->destroy_connector_list); 3175 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); 3176 INIT_WORK(&mgr->tx_work, drm_dp_tx_work); 3177 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work); 3178 init_waitqueue_head(&mgr->tx_waitq); 3179 mgr->dev = dev; 3180 mgr->aux = aux; 3181 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; 3182 mgr->max_payloads = max_payloads; 3183 mgr->conn_base_id = conn_base_id; 3184 if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 || 3185 max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8) 3186 return -EINVAL; 3187 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); 3188 if (!mgr->payloads) 3189 return -ENOMEM; 3190 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); 3191 if (!mgr->proposed_vcpis) 3192 return -ENOMEM; 3193 set_bit(0, &mgr->payload_mask); 3194 if (test_calc_pbn_mode() < 0) 3195 DRM_ERROR("MST PBN self-test failed\n"); 3196 3197 mst_state = kzalloc(sizeof(*mst_state), GFP_KERNEL); 3198 if (mst_state == NULL) 3199 return -ENOMEM; 3200 3201 mst_state->mgr = mgr; 3202 3203 /* max. time slots - one slot for MTP header */ 3204 mst_state->avail_slots = 63; 3205 3206 drm_atomic_private_obj_init(&mgr->base, 3207 &mst_state->base, 3208 &mst_state_funcs); 3209 3210 return 0; 3211 } 3212 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); 3213 3214 /** 3215 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. 3216 * @mgr: manager to destroy 3217 */ 3218 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) 3219 { 3220 flush_work(&mgr->work); 3221 flush_work(&mgr->destroy_connector_work); 3222 mutex_lock(&mgr->payload_lock); 3223 kfree(mgr->payloads); 3224 mgr->payloads = NULL; 3225 kfree(mgr->proposed_vcpis); 3226 mgr->proposed_vcpis = NULL; 3227 mutex_unlock(&mgr->payload_lock); 3228 mgr->dev = NULL; 3229 mgr->aux = NULL; 3230 drm_atomic_private_obj_fini(&mgr->base); 3231 mgr->funcs = NULL; 3232 } 3233 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); 3234 3235 /* I2C device */ 3236 static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, 3237 int num) 3238 { 3239 struct drm_dp_aux *aux = adapter->algo_data; 3240 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); 3241 struct drm_dp_mst_branch *mstb; 3242 struct drm_dp_mst_topology_mgr *mgr = port->mgr; 3243 unsigned int i; 3244 bool reading = false; 3245 struct drm_dp_sideband_msg_req_body msg; 3246 struct drm_dp_sideband_msg_tx *txmsg = NULL; 3247 int ret; 3248 3249 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); 3250 if (!mstb) 3251 return -EREMOTEIO; 3252 3253 /* construct i2c msg */ 3254 /* see if last msg is a read */ 3255 if (msgs[num - 1].flags & I2C_M_RD) 3256 reading = true; 3257 3258 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) { 3259 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); 3260 ret = -EIO; 3261 goto out; 3262 } 3263 3264 memset(&msg, 0, sizeof(msg)); 3265 msg.req_type = DP_REMOTE_I2C_READ; 3266 msg.u.i2c_read.num_transactions = num - 1; 3267 msg.u.i2c_read.port_number = port->port_num; 3268 for (i = 0; i < num - 1; i++) { 3269 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; 3270 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; 3271 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; 3272 } 3273 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; 3274 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; 3275 3276 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 3277 if (!txmsg) { 3278 ret = -ENOMEM; 3279 goto out; 3280 } 3281 3282 txmsg->dst = mstb; 3283 drm_dp_encode_sideband_req(&msg, txmsg); 3284 3285 drm_dp_queue_down_tx(mgr, txmsg); 3286 3287 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 3288 if (ret > 0) { 3289 3290 if (txmsg->reply.reply_type == 1) { /* got a NAK back */ 3291 ret = -EREMOTEIO; 3292 goto out; 3293 } 3294 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { 3295 ret = -EIO; 3296 goto out; 3297 } 3298 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); 3299 ret = num; 3300 } 3301 out: 3302 kfree(txmsg); 3303 drm_dp_put_mst_branch_device(mstb); 3304 return ret; 3305 } 3306 3307 static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) 3308 { 3309 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | 3310 I2C_FUNC_SMBUS_READ_BLOCK_DATA | 3311 I2C_FUNC_SMBUS_BLOCK_PROC_CALL | 3312 I2C_FUNC_10BIT_ADDR; 3313 } 3314 3315 static const struct i2c_algorithm drm_dp_mst_i2c_algo = { 3316 .functionality = drm_dp_mst_i2c_functionality, 3317 .master_xfer = drm_dp_mst_i2c_xfer, 3318 }; 3319 3320 /** 3321 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX 3322 * @aux: DisplayPort AUX channel 3323 * 3324 * Returns 0 on success or a negative error code on failure. 3325 */ 3326 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) 3327 { 3328 aux->ddc.algo = &drm_dp_mst_i2c_algo; 3329 aux->ddc.algo_data = aux; 3330 aux->ddc.retries = 3; 3331 3332 #if 0 3333 aux->ddc.class = I2C_CLASS_DDC; 3334 aux->ddc.owner = THIS_MODULE; 3335 #endif 3336 aux->ddc.dev.parent = aux->dev; 3337 #if 0 3338 aux->ddc.dev.of_node = aux->dev->of_node; 3339 #endif 3340 3341 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), 3342 sizeof(aux->ddc.name)); 3343 3344 return i2c_add_adapter(&aux->ddc); 3345 } 3346 3347 /** 3348 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter 3349 * @aux: DisplayPort AUX channel 3350 */ 3351 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) 3352 { 3353 i2c_del_adapter(&aux->ddc); 3354 } 3355