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