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