drm_dp_mst_topology.c revision 1.5
1 /* $NetBSD: drm_dp_mst_topology.c,v 1.5 2020/02/14 14:34:57 maya Exp $ */ 2 3 /* 4 * Copyright 2014 Red Hat 5 * 6 * Permission to use, copy, modify, distribute, and sell this software and its 7 * documentation for any purpose is hereby granted without fee, provided that 8 * the above copyright notice appear in all copies and that both that copyright 9 * notice and this permission notice appear in supporting documentation, and 10 * that the name of the copyright holders not be used in advertising or 11 * publicity pertaining to distribution of the software without specific, 12 * written prior permission. The copyright holders make no representations 13 * about the suitability of this software for any purpose. It is provided "as 14 * is" without express or implied warranty. 15 * 16 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 17 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 18 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 19 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 20 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 21 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 22 * OF THIS SOFTWARE. 23 */ 24 25 #include <sys/cdefs.h> 26 __KERNEL_RCSID(0, "$NetBSD: drm_dp_mst_topology.c,v 1.5 2020/02/14 14:34:57 maya Exp $"); 27 28 #include <linux/kernel.h> 29 #include <linux/delay.h> 30 #include <linux/init.h> 31 #include <linux/errno.h> 32 #include <linux/sched.h> 33 #include <linux/seq_file.h> 34 #include <linux/i2c.h> 35 #include <drm/drm_dp_mst_helper.h> 36 #include <drm/drmP.h> 37 38 #include <drm/drm_fixed.h> 39 40 #include <linux/nbsd-namespace.h> 41 42 /** 43 * DOC: dp mst helper 44 * 45 * These functions contain parts of the DisplayPort 1.2a MultiStream Transport 46 * protocol. The helpers contain a topology manager and bandwidth manager. 47 * The helpers encapsulate the sending and received of sideband msgs. 48 */ 49 #if IS_ENABLED(CONFIG_DEBUG_FS) 50 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, 51 char *buf); 52 #endif 53 static int test_calc_pbn_mode(void); 54 55 static void drm_dp_put_port(struct drm_dp_mst_port *port); 56 57 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, 58 int id, 59 struct drm_dp_payload *payload); 60 61 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, 62 struct drm_dp_mst_port *port, 63 int offset, int size, u8 *bytes); 64 65 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, 66 struct drm_dp_mst_branch *mstb); 67 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, 68 struct drm_dp_mst_branch *mstb, 69 struct drm_dp_mst_port *port); 70 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, 71 u8 *guid); 72 73 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); 74 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); 75 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); 76 /* sideband msg handling */ 77 static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) 78 { 79 u8 bitmask = 0x80; 80 u8 bitshift = 7; 81 u8 array_index = 0; 82 int number_of_bits = num_nibbles * 4; 83 u8 remainder = 0; 84 85 while (number_of_bits != 0) { 86 number_of_bits--; 87 remainder <<= 1; 88 remainder |= (data[array_index] & bitmask) >> bitshift; 89 bitmask >>= 1; 90 bitshift--; 91 if (bitmask == 0) { 92 bitmask = 0x80; 93 bitshift = 7; 94 array_index++; 95 } 96 if ((remainder & 0x10) == 0x10) 97 remainder ^= 0x13; 98 } 99 100 number_of_bits = 4; 101 while (number_of_bits != 0) { 102 number_of_bits--; 103 remainder <<= 1; 104 if ((remainder & 0x10) != 0) 105 remainder ^= 0x13; 106 } 107 108 return remainder; 109 } 110 111 static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) 112 { 113 u8 bitmask = 0x80; 114 u8 bitshift = 7; 115 u8 array_index = 0; 116 int number_of_bits = number_of_bytes * 8; 117 u16 remainder = 0; 118 119 while (number_of_bits != 0) { 120 number_of_bits--; 121 remainder <<= 1; 122 remainder |= (data[array_index] & bitmask) >> bitshift; 123 bitmask >>= 1; 124 bitshift--; 125 if (bitmask == 0) { 126 bitmask = 0x80; 127 bitshift = 7; 128 array_index++; 129 } 130 if ((remainder & 0x100) == 0x100) 131 remainder ^= 0xd5; 132 } 133 134 number_of_bits = 8; 135 while (number_of_bits != 0) { 136 number_of_bits--; 137 remainder <<= 1; 138 if ((remainder & 0x100) != 0) 139 remainder ^= 0xd5; 140 } 141 142 return remainder & 0xff; 143 } 144 static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) 145 { 146 u8 size = 3; 147 size += (hdr->lct / 2); 148 return size; 149 } 150 151 static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, 152 u8 *buf, int *len) 153 { 154 int idx = 0; 155 int i; 156 u8 crc4; 157 buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); 158 for (i = 0; i < (hdr->lct / 2); i++) 159 buf[idx++] = hdr->rad[i]; 160 buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | 161 (hdr->msg_len & 0x3f); 162 buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); 163 164 crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); 165 buf[idx - 1] |= (crc4 & 0xf); 166 167 *len = idx; 168 } 169 170 static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, 171 u8 *buf, int buflen, u8 *hdrlen) 172 { 173 u8 crc4; 174 u8 len; 175 int i; 176 u8 idx; 177 if (buf[0] == 0) 178 return false; 179 len = 3; 180 len += ((buf[0] & 0xf0) >> 4) / 2; 181 if (len > buflen) 182 return false; 183 crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); 184 185 if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { 186 DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); 187 return false; 188 } 189 190 hdr->lct = (buf[0] & 0xf0) >> 4; 191 hdr->lcr = (buf[0] & 0xf); 192 idx = 1; 193 for (i = 0; i < (hdr->lct / 2); i++) 194 hdr->rad[i] = buf[idx++]; 195 hdr->broadcast = (buf[idx] >> 7) & 0x1; 196 hdr->path_msg = (buf[idx] >> 6) & 0x1; 197 hdr->msg_len = buf[idx] & 0x3f; 198 idx++; 199 hdr->somt = (buf[idx] >> 7) & 0x1; 200 hdr->eomt = (buf[idx] >> 6) & 0x1; 201 hdr->seqno = (buf[idx] >> 4) & 0x1; 202 idx++; 203 *hdrlen = idx; 204 return true; 205 } 206 207 static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, 208 struct drm_dp_sideband_msg_tx *raw) 209 { 210 int idx = 0; 211 int i; 212 u8 *buf = raw->msg; 213 buf[idx++] = req->req_type & 0x7f; 214 215 switch (req->req_type) { 216 case DP_ENUM_PATH_RESOURCES: 217 buf[idx] = (req->u.port_num.port_number & 0xf) << 4; 218 idx++; 219 break; 220 case DP_ALLOCATE_PAYLOAD: 221 buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | 222 (req->u.allocate_payload.number_sdp_streams & 0xf); 223 idx++; 224 buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); 225 idx++; 226 buf[idx] = (req->u.allocate_payload.pbn >> 8); 227 idx++; 228 buf[idx] = (req->u.allocate_payload.pbn & 0xff); 229 idx++; 230 for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { 231 buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | 232 (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); 233 idx++; 234 } 235 if (req->u.allocate_payload.number_sdp_streams & 1) { 236 i = req->u.allocate_payload.number_sdp_streams - 1; 237 buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; 238 idx++; 239 } 240 break; 241 case DP_QUERY_PAYLOAD: 242 buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; 243 idx++; 244 buf[idx] = (req->u.query_payload.vcpi & 0x7f); 245 idx++; 246 break; 247 case DP_REMOTE_DPCD_READ: 248 buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; 249 buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; 250 idx++; 251 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; 252 idx++; 253 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); 254 idx++; 255 buf[idx] = (req->u.dpcd_read.num_bytes); 256 idx++; 257 break; 258 259 case DP_REMOTE_DPCD_WRITE: 260 buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; 261 buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; 262 idx++; 263 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; 264 idx++; 265 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); 266 idx++; 267 buf[idx] = (req->u.dpcd_write.num_bytes); 268 idx++; 269 memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); 270 idx += req->u.dpcd_write.num_bytes; 271 break; 272 case DP_REMOTE_I2C_READ: 273 buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; 274 buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); 275 idx++; 276 for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { 277 buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; 278 idx++; 279 buf[idx] = req->u.i2c_read.transactions[i].num_bytes; 280 idx++; 281 memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); 282 idx += req->u.i2c_read.transactions[i].num_bytes; 283 284 buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; 285 buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); 286 idx++; 287 } 288 buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; 289 idx++; 290 buf[idx] = (req->u.i2c_read.num_bytes_read); 291 idx++; 292 break; 293 294 case DP_REMOTE_I2C_WRITE: 295 buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; 296 idx++; 297 buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; 298 idx++; 299 buf[idx] = (req->u.i2c_write.num_bytes); 300 idx++; 301 memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); 302 idx += req->u.i2c_write.num_bytes; 303 break; 304 } 305 raw->cur_len = idx; 306 } 307 308 static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) 309 { 310 u8 crc4; 311 crc4 = drm_dp_msg_data_crc4(msg, len); 312 msg[len] = crc4; 313 } 314 315 static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, 316 struct drm_dp_sideband_msg_tx *raw) 317 { 318 int idx = 0; 319 u8 *buf = raw->msg; 320 321 buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); 322 323 raw->cur_len = idx; 324 } 325 326 /* this adds a chunk of msg to the builder to get the final msg */ 327 static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, 328 u8 *replybuf, u8 replybuflen, bool hdr) 329 { 330 int ret; 331 u8 crc4 __unused; /* XXX Mistake? */ 332 333 if (hdr) { 334 u8 hdrlen; 335 struct drm_dp_sideband_msg_hdr recv_hdr; 336 ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); 337 if (ret == false) { 338 print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); 339 return false; 340 } 341 342 /* 343 * ignore out-of-order messages or messages that are part of a 344 * failed transaction 345 */ 346 if (!recv_hdr.somt && !msg->have_somt) 347 return false; 348 349 /* get length contained in this portion */ 350 msg->curchunk_len = recv_hdr.msg_len; 351 msg->curchunk_hdrlen = hdrlen; 352 353 /* we have already gotten an somt - don't bother parsing */ 354 if (recv_hdr.somt && msg->have_somt) 355 return false; 356 357 if (recv_hdr.somt) { 358 memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); 359 msg->have_somt = true; 360 } 361 if (recv_hdr.eomt) 362 msg->have_eomt = true; 363 364 /* copy the bytes for the remainder of this header chunk */ 365 msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); 366 memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); 367 } else { 368 memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); 369 msg->curchunk_idx += replybuflen; 370 } 371 372 if (msg->curchunk_idx >= msg->curchunk_len) { 373 /* do CRC */ 374 crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); 375 /* copy chunk into bigger msg */ 376 memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); 377 msg->curlen += msg->curchunk_len - 1; 378 } 379 return true; 380 } 381 382 static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, 383 struct drm_dp_sideband_msg_reply_body *repmsg) 384 { 385 int idx = 1; 386 int i; 387 memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); 388 idx += 16; 389 repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; 390 idx++; 391 if (idx > raw->curlen) 392 goto fail_len; 393 for (i = 0; i < repmsg->u.link_addr.nports; i++) { 394 if (raw->msg[idx] & 0x80) 395 repmsg->u.link_addr.ports[i].input_port = 1; 396 397 repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; 398 repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); 399 400 idx++; 401 if (idx > raw->curlen) 402 goto fail_len; 403 repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; 404 repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; 405 if (repmsg->u.link_addr.ports[i].input_port == 0) 406 repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; 407 idx++; 408 if (idx > raw->curlen) 409 goto fail_len; 410 if (repmsg->u.link_addr.ports[i].input_port == 0) { 411 repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); 412 idx++; 413 if (idx > raw->curlen) 414 goto fail_len; 415 memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); 416 idx += 16; 417 if (idx > raw->curlen) 418 goto fail_len; 419 repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; 420 repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); 421 idx++; 422 423 } 424 if (idx > raw->curlen) 425 goto fail_len; 426 } 427 428 return true; 429 fail_len: 430 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); 431 return false; 432 } 433 434 static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, 435 struct drm_dp_sideband_msg_reply_body *repmsg) 436 { 437 int idx = 1; 438 repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; 439 idx++; 440 if (idx > raw->curlen) 441 goto fail_len; 442 repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; 443 if (idx > raw->curlen) 444 goto fail_len; 445 446 memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); 447 return true; 448 fail_len: 449 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); 450 return false; 451 } 452 453 static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, 454 struct drm_dp_sideband_msg_reply_body *repmsg) 455 { 456 int idx = 1; 457 repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; 458 idx++; 459 if (idx > raw->curlen) 460 goto fail_len; 461 return true; 462 fail_len: 463 DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); 464 return false; 465 } 466 467 static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, 468 struct drm_dp_sideband_msg_reply_body *repmsg) 469 { 470 int idx = 1; 471 472 repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); 473 idx++; 474 if (idx > raw->curlen) 475 goto fail_len; 476 repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; 477 idx++; 478 /* TODO check */ 479 memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); 480 return true; 481 fail_len: 482 DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); 483 return false; 484 } 485 486 static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, 487 struct drm_dp_sideband_msg_reply_body *repmsg) 488 { 489 int idx = 1; 490 repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; 491 idx++; 492 if (idx > raw->curlen) 493 goto fail_len; 494 repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); 495 idx += 2; 496 if (idx > raw->curlen) 497 goto fail_len; 498 repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); 499 idx += 2; 500 if (idx > raw->curlen) 501 goto fail_len; 502 return true; 503 fail_len: 504 DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); 505 return false; 506 } 507 508 static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, 509 struct drm_dp_sideband_msg_reply_body *repmsg) 510 { 511 int idx = 1; 512 repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; 513 idx++; 514 if (idx > raw->curlen) 515 goto fail_len; 516 repmsg->u.allocate_payload.vcpi = raw->msg[idx]; 517 idx++; 518 if (idx > raw->curlen) 519 goto fail_len; 520 repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); 521 idx += 2; 522 if (idx > raw->curlen) 523 goto fail_len; 524 return true; 525 fail_len: 526 DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); 527 return false; 528 } 529 530 static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, 531 struct drm_dp_sideband_msg_reply_body *repmsg) 532 { 533 int idx = 1; 534 repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; 535 idx++; 536 if (idx > raw->curlen) 537 goto fail_len; 538 repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); 539 idx += 2; 540 if (idx > raw->curlen) 541 goto fail_len; 542 return true; 543 fail_len: 544 DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); 545 return false; 546 } 547 548 static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, 549 struct drm_dp_sideband_msg_reply_body *msg) 550 { 551 memset(msg, 0, sizeof(*msg)); 552 msg->reply_type = (raw->msg[0] & 0x80) >> 7; 553 msg->req_type = (raw->msg[0] & 0x7f); 554 555 if (msg->reply_type) { 556 memcpy(msg->u.nak.guid, &raw->msg[1], 16); 557 msg->u.nak.reason = raw->msg[17]; 558 msg->u.nak.nak_data = raw->msg[18]; 559 return false; 560 } 561 562 switch (msg->req_type) { 563 case DP_LINK_ADDRESS: 564 return drm_dp_sideband_parse_link_address(raw, msg); 565 case DP_QUERY_PAYLOAD: 566 return drm_dp_sideband_parse_query_payload_ack(raw, msg); 567 case DP_REMOTE_DPCD_READ: 568 return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); 569 case DP_REMOTE_DPCD_WRITE: 570 return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); 571 case DP_REMOTE_I2C_READ: 572 return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); 573 case DP_ENUM_PATH_RESOURCES: 574 return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); 575 case DP_ALLOCATE_PAYLOAD: 576 return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); 577 default: 578 DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); 579 return false; 580 } 581 } 582 583 static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, 584 struct drm_dp_sideband_msg_req_body *msg) 585 { 586 int idx = 1; 587 588 msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; 589 idx++; 590 if (idx > raw->curlen) 591 goto fail_len; 592 593 memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); 594 idx += 16; 595 if (idx > raw->curlen) 596 goto fail_len; 597 598 msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; 599 msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; 600 msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; 601 msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; 602 msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); 603 idx++; 604 return true; 605 fail_len: 606 DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); 607 return false; 608 } 609 610 static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, 611 struct drm_dp_sideband_msg_req_body *msg) 612 { 613 int idx = 1; 614 615 msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; 616 idx++; 617 if (idx > raw->curlen) 618 goto fail_len; 619 620 memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); 621 idx += 16; 622 if (idx > raw->curlen) 623 goto fail_len; 624 625 msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); 626 idx++; 627 return true; 628 fail_len: 629 DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); 630 return false; 631 } 632 633 static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, 634 struct drm_dp_sideband_msg_req_body *msg) 635 { 636 memset(msg, 0, sizeof(*msg)); 637 msg->req_type = (raw->msg[0] & 0x7f); 638 639 switch (msg->req_type) { 640 case DP_CONNECTION_STATUS_NOTIFY: 641 return drm_dp_sideband_parse_connection_status_notify(raw, msg); 642 case DP_RESOURCE_STATUS_NOTIFY: 643 return drm_dp_sideband_parse_resource_status_notify(raw, msg); 644 default: 645 DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); 646 return false; 647 } 648 } 649 650 static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) 651 { 652 struct drm_dp_sideband_msg_req_body req; 653 654 req.req_type = DP_REMOTE_DPCD_WRITE; 655 req.u.dpcd_write.port_number = port_num; 656 req.u.dpcd_write.dpcd_address = offset; 657 req.u.dpcd_write.num_bytes = num_bytes; 658 req.u.dpcd_write.bytes = bytes; 659 drm_dp_encode_sideband_req(&req, msg); 660 661 return 0; 662 } 663 664 static int build_link_address(struct drm_dp_sideband_msg_tx *msg) 665 { 666 struct drm_dp_sideband_msg_req_body req; 667 668 req.req_type = DP_LINK_ADDRESS; 669 drm_dp_encode_sideband_req(&req, msg); 670 return 0; 671 } 672 673 static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) 674 { 675 struct drm_dp_sideband_msg_req_body req; 676 677 req.req_type = DP_ENUM_PATH_RESOURCES; 678 req.u.port_num.port_number = port_num; 679 drm_dp_encode_sideband_req(&req, msg); 680 msg->path_msg = true; 681 return 0; 682 } 683 684 static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, 685 u8 vcpi, uint16_t pbn) 686 { 687 struct drm_dp_sideband_msg_req_body req; 688 memset(&req, 0, sizeof(req)); 689 req.req_type = DP_ALLOCATE_PAYLOAD; 690 req.u.allocate_payload.port_number = port_num; 691 req.u.allocate_payload.vcpi = vcpi; 692 req.u.allocate_payload.pbn = pbn; 693 drm_dp_encode_sideband_req(&req, msg); 694 msg->path_msg = true; 695 return 0; 696 } 697 698 static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, 699 struct drm_dp_vcpi *vcpi) 700 { 701 int ret, vcpi_ret; 702 703 mutex_lock(&mgr->payload_lock); 704 ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); 705 if (ret > mgr->max_payloads) { 706 ret = -EINVAL; 707 DRM_DEBUG_KMS("out of payload ids %d\n", ret); 708 goto out_unlock; 709 } 710 711 vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); 712 if (vcpi_ret > mgr->max_payloads) { 713 ret = -EINVAL; 714 DRM_DEBUG_KMS("out of vcpi ids %d\n", ret); 715 goto out_unlock; 716 } 717 718 set_bit(ret, &mgr->payload_mask); 719 set_bit(vcpi_ret, &mgr->vcpi_mask); 720 vcpi->vcpi = vcpi_ret + 1; 721 mgr->proposed_vcpis[ret - 1] = vcpi; 722 out_unlock: 723 mutex_unlock(&mgr->payload_lock); 724 return ret; 725 } 726 727 static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, 728 int vcpi) 729 { 730 int i; 731 if (vcpi == 0) 732 return; 733 734 mutex_lock(&mgr->payload_lock); 735 DRM_DEBUG_KMS("putting payload %d\n", vcpi); 736 clear_bit(vcpi - 1, &mgr->vcpi_mask); 737 738 for (i = 0; i < mgr->max_payloads; i++) { 739 if (mgr->proposed_vcpis[i]) 740 if (mgr->proposed_vcpis[i]->vcpi == vcpi) { 741 mgr->proposed_vcpis[i] = NULL; 742 clear_bit(i + 1, &mgr->payload_mask); 743 } 744 } 745 mutex_unlock(&mgr->payload_lock); 746 } 747 748 static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, 749 struct drm_dp_sideband_msg_tx *txmsg) 750 { 751 bool ret; 752 753 /* 754 * All updates to txmsg->state are protected by mgr->qlock, and the two 755 * cases we check here are terminal states. For those the barriers 756 * provided by the wake_up/wait_event pair are enough. 757 */ 758 ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX || 759 txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT); 760 return ret; 761 } 762 763 static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, 764 struct drm_dp_sideband_msg_tx *txmsg) 765 { 766 struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; 767 int ret; 768 769 #ifdef __NetBSD__ 770 mutex_lock(&mstb->mgr->qlock); 771 DRM_TIMED_WAIT_UNTIL(ret, &mgr->tx_waitq, &mstb->mgr->qlock, 4*HZ, 772 check_txmsg_state(mgr, txmsg)); 773 #else 774 ret = wait_event_timeout(mgr->tx_waitq, 775 check_txmsg_state(mgr, txmsg), 776 (4 * HZ)); 777 mutex_lock(&mstb->mgr->qlock); 778 #endif 779 if (ret > 0) { 780 if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { 781 ret = -EIO; 782 goto out; 783 } 784 } else { 785 DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); 786 787 /* dump some state */ 788 ret = -EIO; 789 790 /* remove from q */ 791 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || 792 txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { 793 list_del(&txmsg->next); 794 } 795 796 if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || 797 txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { 798 mstb->tx_slots[txmsg->seqno] = NULL; 799 } 800 } 801 out: 802 mutex_unlock(&mgr->qlock); 803 804 return ret; 805 } 806 807 static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) 808 { 809 struct drm_dp_mst_branch *mstb; 810 811 mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); 812 if (!mstb) 813 return NULL; 814 815 mstb->lct = lct; 816 if (lct > 1) 817 memcpy(mstb->rad, rad, lct / 2); 818 INIT_LIST_HEAD(&mstb->ports); 819 kref_init(&mstb->kref); 820 return mstb; 821 } 822 823 static void drm_dp_free_mst_port(struct kref *kref); 824 825 static void drm_dp_free_mst_branch_device(struct kref *kref) 826 { 827 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); 828 if (mstb->port_parent) { 829 if (list_empty(&mstb->port_parent->next)) 830 kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port); 831 } 832 kfree(mstb); 833 } 834 835 static void drm_dp_destroy_mst_branch_device(struct kref *kref) 836 { 837 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); 838 struct drm_dp_mst_port *port, *tmp; 839 bool wake_tx = false; 840 841 /* 842 * init kref again to be used by ports to remove mst branch when it is 843 * not needed anymore 844 */ 845 kref_init(kref); 846 847 if (mstb->port_parent && list_empty(&mstb->port_parent->next)) 848 kref_get(&mstb->port_parent->kref); 849 850 /* 851 * destroy all ports - don't need lock 852 * as there are no more references to the mst branch 853 * device at this point. 854 */ 855 list_for_each_entry_safe(port, tmp, &mstb->ports, next) { 856 list_del(&port->next); 857 drm_dp_put_port(port); 858 } 859 860 /* drop any tx slots msg */ 861 mutex_lock(&mstb->mgr->qlock); 862 if (mstb->tx_slots[0]) { 863 mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; 864 mstb->tx_slots[0] = NULL; 865 wake_tx = true; 866 } 867 if (mstb->tx_slots[1]) { 868 mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; 869 mstb->tx_slots[1] = NULL; 870 wake_tx = true; 871 } 872 #ifdef __NetBSD__ 873 if (wake_tx) 874 DRM_WAKEUP_ONE(&mstb->mgr->tx_waitq, &mstb->mgr->qlock); 875 mutex_unlock(&mstb->mgr->qlock); 876 #else 877 mutex_unlock(&mstb->mgr->qlock); 878 879 if (wake_tx) 880 wake_up(&mstb->mgr->tx_waitq); 881 #endif 882 883 kref_put(kref, drm_dp_free_mst_branch_device); 884 } 885 886 static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) 887 { 888 kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); 889 } 890 891 892 static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) 893 { 894 struct drm_dp_mst_branch *mstb; 895 896 switch (old_pdt) { 897 case DP_PEER_DEVICE_DP_LEGACY_CONV: 898 case DP_PEER_DEVICE_SST_SINK: 899 /* remove i2c over sideband */ 900 drm_dp_mst_unregister_i2c_bus(&port->aux); 901 break; 902 case DP_PEER_DEVICE_MST_BRANCHING: 903 mstb = port->mstb; 904 port->mstb = NULL; 905 drm_dp_put_mst_branch_device(mstb); 906 break; 907 } 908 } 909 910 static void drm_dp_destroy_port(struct kref *kref) 911 { 912 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); 913 struct drm_dp_mst_topology_mgr *mgr = port->mgr; 914 915 if (!port->input) { 916 port->vcpi.num_slots = 0; 917 918 kfree(port->cached_edid); 919 920 /* 921 * The only time we don't have a connector 922 * on an output port is if the connector init 923 * fails. 924 */ 925 if (port->connector) { 926 /* we can't destroy the connector here, as 927 * we might be holding the mode_config.mutex 928 * from an EDID retrieval */ 929 930 mutex_lock(&mgr->destroy_connector_lock); 931 kref_get(&port->parent->kref); 932 list_add(&port->next, &mgr->destroy_connector_list); 933 mutex_unlock(&mgr->destroy_connector_lock); 934 schedule_work(&mgr->destroy_connector_work); 935 return; 936 } 937 /* no need to clean up vcpi 938 * as if we have no connector we never setup a vcpi */ 939 drm_dp_port_teardown_pdt(port, port->pdt); 940 port->pdt = DP_PEER_DEVICE_NONE; 941 } 942 kfree(port); 943 } 944 945 static void drm_dp_put_port(struct drm_dp_mst_port *port) 946 { 947 kref_put(&port->kref, drm_dp_destroy_port); 948 } 949 950 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) 951 { 952 struct drm_dp_mst_port *port; 953 struct drm_dp_mst_branch *rmstb; 954 if (to_find == mstb) { 955 kref_get(&mstb->kref); 956 return mstb; 957 } 958 list_for_each_entry(port, &mstb->ports, next) { 959 if (port->mstb) { 960 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); 961 if (rmstb) 962 return rmstb; 963 } 964 } 965 return NULL; 966 } 967 968 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) 969 { 970 struct drm_dp_mst_branch *rmstb = NULL; 971 mutex_lock(&mgr->lock); 972 if (mgr->mst_primary) 973 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb); 974 mutex_unlock(&mgr->lock); 975 return rmstb; 976 } 977 978 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) 979 { 980 struct drm_dp_mst_port *port, *mport; 981 982 list_for_each_entry(port, &mstb->ports, next) { 983 if (port == to_find) { 984 kref_get(&port->kref); 985 return port; 986 } 987 if (port->mstb) { 988 mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); 989 if (mport) 990 return mport; 991 } 992 } 993 return NULL; 994 } 995 996 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) 997 { 998 struct drm_dp_mst_port *rport = NULL; 999 mutex_lock(&mgr->lock); 1000 if (mgr->mst_primary) 1001 rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); 1002 mutex_unlock(&mgr->lock); 1003 return rport; 1004 } 1005 1006 static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) 1007 { 1008 struct drm_dp_mst_port *port; 1009 1010 list_for_each_entry(port, &mstb->ports, next) { 1011 if (port->port_num == port_num) { 1012 kref_get(&port->kref); 1013 return port; 1014 } 1015 } 1016 1017 return NULL; 1018 } 1019 1020 /* 1021 * calculate a new RAD for this MST branch device 1022 * if parent has an LCT of 2 then it has 1 nibble of RAD, 1023 * if parent has an LCT of 3 then it has 2 nibbles of RAD, 1024 */ 1025 static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, 1026 u8 *rad) 1027 { 1028 int parent_lct = port->parent->lct; 1029 int shift = 4; 1030 int idx = (parent_lct - 1) / 2; 1031 if (parent_lct > 1) { 1032 memcpy(rad, port->parent->rad, idx + 1); 1033 shift = (parent_lct % 2) ? 4 : 0; 1034 } else 1035 rad[0] = 0; 1036 1037 rad[idx] |= port->port_num << shift; 1038 return parent_lct + 1; 1039 } 1040 1041 /* 1042 * return sends link address for new mstb 1043 */ 1044 static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) 1045 { 1046 int ret __unused; 1047 u8 rad[6], lct; 1048 bool send_link = false; 1049 switch (port->pdt) { 1050 case DP_PEER_DEVICE_DP_LEGACY_CONV: 1051 case DP_PEER_DEVICE_SST_SINK: 1052 /* add i2c over sideband */ 1053 ret = drm_dp_mst_register_i2c_bus(&port->aux); 1054 break; 1055 case DP_PEER_DEVICE_MST_BRANCHING: 1056 lct = drm_dp_calculate_rad(port, rad); 1057 1058 port->mstb = drm_dp_add_mst_branch_device(lct, rad); 1059 port->mstb->mgr = port->mgr; 1060 port->mstb->port_parent = port; 1061 1062 send_link = true; 1063 break; 1064 } 1065 return send_link; 1066 } 1067 1068 static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) 1069 { 1070 int ret __unused; 1071 1072 memcpy(mstb->guid, guid, 16); 1073 1074 if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { 1075 if (mstb->port_parent) { 1076 ret = drm_dp_send_dpcd_write( 1077 mstb->mgr, 1078 mstb->port_parent, 1079 DP_GUID, 1080 16, 1081 mstb->guid); 1082 } else { 1083 1084 ret = drm_dp_dpcd_write( 1085 mstb->mgr->aux, 1086 DP_GUID, 1087 mstb->guid, 1088 16); 1089 } 1090 } 1091 } 1092 1093 static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, 1094 int pnum, 1095 char *proppath, 1096 size_t proppath_size) 1097 { 1098 int i; 1099 char temp[8]; 1100 snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); 1101 for (i = 0; i < (mstb->lct - 1); i++) { 1102 int shift = (i % 2) ? 0 : 4; 1103 int port_num = (mstb->rad[i / 2] >> shift) & 0xf; 1104 snprintf(temp, sizeof(temp), "-%d", port_num); 1105 strlcat(proppath, temp, proppath_size); 1106 } 1107 snprintf(temp, sizeof(temp), "-%d", pnum); 1108 strlcat(proppath, temp, proppath_size); 1109 } 1110 1111 static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, 1112 struct device *dev, 1113 struct drm_dp_link_addr_reply_port *port_msg) 1114 { 1115 struct drm_dp_mst_port *port; 1116 bool ret; 1117 bool created = false; 1118 int old_pdt = 0; 1119 int old_ddps = 0; 1120 port = drm_dp_get_port(mstb, port_msg->port_number); 1121 if (!port) { 1122 port = kzalloc(sizeof(*port), GFP_KERNEL); 1123 if (!port) 1124 return; 1125 kref_init(&port->kref); 1126 port->parent = mstb; 1127 port->port_num = port_msg->port_number; 1128 port->mgr = mstb->mgr; 1129 port->aux.name = "DPMST"; 1130 port->aux.dev = dev; 1131 created = true; 1132 } else { 1133 old_pdt = port->pdt; 1134 old_ddps = port->ddps; 1135 } 1136 1137 port->pdt = port_msg->peer_device_type; 1138 port->input = port_msg->input_port; 1139 port->mcs = port_msg->mcs; 1140 port->ddps = port_msg->ddps; 1141 port->ldps = port_msg->legacy_device_plug_status; 1142 port->dpcd_rev = port_msg->dpcd_revision; 1143 port->num_sdp_streams = port_msg->num_sdp_streams; 1144 port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; 1145 1146 /* manage mstb port lists with mgr lock - take a reference 1147 for this list */ 1148 if (created) { 1149 mutex_lock(&mstb->mgr->lock); 1150 kref_get(&port->kref); 1151 list_add(&port->next, &mstb->ports); 1152 mutex_unlock(&mstb->mgr->lock); 1153 } 1154 1155 if (old_ddps != port->ddps) { 1156 if (port->ddps) { 1157 if (!port->input) 1158 drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); 1159 } else { 1160 port->available_pbn = 0; 1161 } 1162 } 1163 1164 if (old_pdt != port->pdt && !port->input) { 1165 drm_dp_port_teardown_pdt(port, old_pdt); 1166 1167 ret = drm_dp_port_setup_pdt(port); 1168 if (ret == true) 1169 drm_dp_send_link_address(mstb->mgr, port->mstb); 1170 } 1171 1172 if (created && !port->input) { 1173 char proppath[255]; 1174 1175 build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath)); 1176 port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath); 1177 if (!port->connector) { 1178 /* remove it from the port list */ 1179 mutex_lock(&mstb->mgr->lock); 1180 list_del(&port->next); 1181 mutex_unlock(&mstb->mgr->lock); 1182 /* drop port list reference */ 1183 drm_dp_put_port(port); 1184 goto out; 1185 } 1186 if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV || 1187 port->pdt == DP_PEER_DEVICE_SST_SINK) && 1188 port->port_num >= DP_MST_LOGICAL_PORT_0) { 1189 port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc); 1190 drm_mode_connector_set_tile_property(port->connector); 1191 } 1192 (*mstb->mgr->cbs->register_connector)(port->connector); 1193 } 1194 1195 out: 1196 /* put reference to this port */ 1197 drm_dp_put_port(port); 1198 } 1199 1200 static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, 1201 struct drm_dp_connection_status_notify *conn_stat) 1202 { 1203 struct drm_dp_mst_port *port; 1204 int old_pdt; 1205 int old_ddps; 1206 bool dowork = false; 1207 port = drm_dp_get_port(mstb, conn_stat->port_number); 1208 if (!port) 1209 return; 1210 1211 old_ddps = port->ddps; 1212 old_pdt = port->pdt; 1213 port->pdt = conn_stat->peer_device_type; 1214 port->mcs = conn_stat->message_capability_status; 1215 port->ldps = conn_stat->legacy_device_plug_status; 1216 port->ddps = conn_stat->displayport_device_plug_status; 1217 1218 if (old_ddps != port->ddps) { 1219 if (port->ddps) { 1220 dowork = true; 1221 } else { 1222 port->available_pbn = 0; 1223 } 1224 } 1225 if (old_pdt != port->pdt && !port->input) { 1226 drm_dp_port_teardown_pdt(port, old_pdt); 1227 1228 if (drm_dp_port_setup_pdt(port)) 1229 dowork = true; 1230 } 1231 1232 drm_dp_put_port(port); 1233 if (dowork) 1234 queue_work(system_long_wq, &mstb->mgr->work); 1235 1236 } 1237 1238 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, 1239 u8 lct, u8 *rad) 1240 { 1241 struct drm_dp_mst_branch *mstb; 1242 struct drm_dp_mst_port *port; 1243 int i; 1244 /* find the port by iterating down */ 1245 1246 mutex_lock(&mgr->lock); 1247 mstb = mgr->mst_primary; 1248 1249 for (i = 0; i < lct - 1; i++) { 1250 int shift = (i % 2) ? 0 : 4; 1251 int port_num = (rad[i / 2] >> shift) & 0xf; 1252 1253 list_for_each_entry(port, &mstb->ports, next) { 1254 if (port->port_num == port_num) { 1255 mstb = port->mstb; 1256 if (!mstb) { 1257 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); 1258 goto out; 1259 } 1260 1261 break; 1262 } 1263 } 1264 } 1265 kref_get(&mstb->kref); 1266 out: 1267 mutex_unlock(&mgr->lock); 1268 return mstb; 1269 } 1270 1271 static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( 1272 struct drm_dp_mst_branch *mstb, 1273 uint8_t *guid) 1274 { 1275 struct drm_dp_mst_branch *found_mstb; 1276 struct drm_dp_mst_port *port; 1277 1278 if (memcmp(mstb->guid, guid, 16) == 0) 1279 return mstb; 1280 1281 1282 list_for_each_entry(port, &mstb->ports, next) { 1283 if (!port->mstb) 1284 continue; 1285 1286 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); 1287 1288 if (found_mstb) 1289 return found_mstb; 1290 } 1291 1292 return NULL; 1293 } 1294 1295 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid( 1296 struct drm_dp_mst_topology_mgr *mgr, 1297 uint8_t *guid) 1298 { 1299 struct drm_dp_mst_branch *mstb; 1300 1301 /* find the port by iterating down */ 1302 mutex_lock(&mgr->lock); 1303 1304 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); 1305 1306 if (mstb) 1307 kref_get(&mstb->kref); 1308 1309 mutex_unlock(&mgr->lock); 1310 return mstb; 1311 } 1312 1313 static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, 1314 struct drm_dp_mst_branch *mstb) 1315 { 1316 struct drm_dp_mst_port *port; 1317 struct drm_dp_mst_branch *mstb_child; 1318 if (!mstb->link_address_sent) 1319 drm_dp_send_link_address(mgr, mstb); 1320 1321 list_for_each_entry(port, &mstb->ports, next) { 1322 if (port->input) 1323 continue; 1324 1325 if (!port->ddps) 1326 continue; 1327 1328 if (!port->available_pbn) 1329 drm_dp_send_enum_path_resources(mgr, mstb, port); 1330 1331 if (port->mstb) { 1332 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb); 1333 if (mstb_child) { 1334 drm_dp_check_and_send_link_address(mgr, mstb_child); 1335 drm_dp_put_mst_branch_device(mstb_child); 1336 } 1337 } 1338 } 1339 } 1340 1341 static void drm_dp_mst_link_probe_work(struct work_struct *work) 1342 { 1343 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); 1344 struct drm_dp_mst_branch *mstb; 1345 1346 mutex_lock(&mgr->lock); 1347 mstb = mgr->mst_primary; 1348 if (mstb) { 1349 kref_get(&mstb->kref); 1350 } 1351 mutex_unlock(&mgr->lock); 1352 if (mstb) { 1353 drm_dp_check_and_send_link_address(mgr, mstb); 1354 drm_dp_put_mst_branch_device(mstb); 1355 } 1356 } 1357 1358 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, 1359 u8 *guid) 1360 { 1361 static u8 zero_guid[16]; 1362 1363 if (!memcmp(guid, zero_guid, 16)) { 1364 u64 salt = get_jiffies_64(); 1365 memcpy(&guid[0], &salt, sizeof(u64)); 1366 memcpy(&guid[8], &salt, sizeof(u64)); 1367 return false; 1368 } 1369 return true; 1370 } 1371 1372 #if 0 1373 static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) 1374 { 1375 struct drm_dp_sideband_msg_req_body req; 1376 1377 req.req_type = DP_REMOTE_DPCD_READ; 1378 req.u.dpcd_read.port_number = port_num; 1379 req.u.dpcd_read.dpcd_address = offset; 1380 req.u.dpcd_read.num_bytes = num_bytes; 1381 drm_dp_encode_sideband_req(&req, msg); 1382 1383 return 0; 1384 } 1385 #endif 1386 1387 static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, 1388 bool up, u8 *msg, int len) 1389 { 1390 int ret; 1391 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; 1392 int tosend, total, offset; 1393 int retries = 0; 1394 1395 retry: 1396 total = len; 1397 offset = 0; 1398 do { 1399 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); 1400 1401 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, 1402 &msg[offset], 1403 tosend); 1404 if (ret != tosend) { 1405 if (ret == -EIO && retries < 5) { 1406 retries++; 1407 goto retry; 1408 } 1409 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); 1410 1411 return -EIO; 1412 } 1413 offset += tosend; 1414 total -= tosend; 1415 } while (total > 0); 1416 return 0; 1417 } 1418 1419 static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, 1420 struct drm_dp_sideband_msg_tx *txmsg) 1421 { 1422 struct drm_dp_mst_branch *mstb = txmsg->dst; 1423 u8 req_type; 1424 1425 /* both msg slots are full */ 1426 if (txmsg->seqno == -1) { 1427 if (mstb->tx_slots[0] && mstb->tx_slots[1]) { 1428 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); 1429 return -EAGAIN; 1430 } 1431 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { 1432 txmsg->seqno = mstb->last_seqno; 1433 mstb->last_seqno ^= 1; 1434 } else if (mstb->tx_slots[0] == NULL) 1435 txmsg->seqno = 0; 1436 else 1437 txmsg->seqno = 1; 1438 mstb->tx_slots[txmsg->seqno] = txmsg; 1439 } 1440 1441 req_type = txmsg->msg[0] & 0x7f; 1442 if (req_type == DP_CONNECTION_STATUS_NOTIFY || 1443 req_type == DP_RESOURCE_STATUS_NOTIFY) 1444 hdr->broadcast = 1; 1445 else 1446 hdr->broadcast = 0; 1447 hdr->path_msg = txmsg->path_msg; 1448 hdr->lct = mstb->lct; 1449 hdr->lcr = mstb->lct - 1; 1450 if (mstb->lct > 1) 1451 memcpy(hdr->rad, mstb->rad, mstb->lct / 2); 1452 hdr->seqno = txmsg->seqno; 1453 return 0; 1454 } 1455 /* 1456 * process a single block of the next message in the sideband queue 1457 */ 1458 static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, 1459 struct drm_dp_sideband_msg_tx *txmsg, 1460 bool up) 1461 { 1462 u8 chunk[48]; 1463 struct drm_dp_sideband_msg_hdr hdr; 1464 int len, space, idx, tosend; 1465 int ret; 1466 1467 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); 1468 1469 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { 1470 txmsg->seqno = -1; 1471 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; 1472 } 1473 1474 /* make hdr from dst mst - for replies use seqno 1475 otherwise assign one */ 1476 ret = set_hdr_from_dst_qlock(&hdr, txmsg); 1477 if (ret < 0) 1478 return ret; 1479 1480 /* amount left to send in this message */ 1481 len = txmsg->cur_len - txmsg->cur_offset; 1482 1483 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ 1484 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); 1485 1486 tosend = min(len, space); 1487 if (len == txmsg->cur_len) 1488 hdr.somt = 1; 1489 if (space >= len) 1490 hdr.eomt = 1; 1491 1492 1493 hdr.msg_len = tosend + 1; 1494 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); 1495 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); 1496 /* add crc at end */ 1497 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); 1498 idx += tosend + 1; 1499 1500 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); 1501 if (ret) { 1502 DRM_DEBUG_KMS("sideband msg failed to send\n"); 1503 return ret; 1504 } 1505 1506 txmsg->cur_offset += tosend; 1507 if (txmsg->cur_offset == txmsg->cur_len) { 1508 txmsg->state = DRM_DP_SIDEBAND_TX_SENT; 1509 return 1; 1510 } 1511 return 0; 1512 } 1513 1514 static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) 1515 { 1516 struct drm_dp_sideband_msg_tx *txmsg; 1517 int ret; 1518 1519 WARN_ON(!mutex_is_locked(&mgr->qlock)); 1520 1521 /* construct a chunk from the first msg in the tx_msg queue */ 1522 if (list_empty(&mgr->tx_msg_downq)) { 1523 mgr->tx_down_in_progress = false; 1524 return; 1525 } 1526 mgr->tx_down_in_progress = true; 1527 1528 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); 1529 ret = process_single_tx_qlock(mgr, txmsg, false); 1530 if (ret == 1) { 1531 /* txmsg is sent it should be in the slots now */ 1532 list_del(&txmsg->next); 1533 } else if (ret) { 1534 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); 1535 list_del(&txmsg->next); 1536 if (txmsg->seqno != -1) 1537 txmsg->dst->tx_slots[txmsg->seqno] = NULL; 1538 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; 1539 #ifdef __NetBSD__ 1540 DRM_WAKEUP_ONE(&mgr->tx_waitq, &mgr->qlock); 1541 #else 1542 wake_up(&mgr->tx_waitq); 1543 #endif 1544 } 1545 if (list_empty(&mgr->tx_msg_downq)) { 1546 mgr->tx_down_in_progress = false; 1547 return; 1548 } 1549 } 1550 1551 /* called holding qlock */ 1552 static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, 1553 struct drm_dp_sideband_msg_tx *txmsg) 1554 { 1555 int ret; 1556 1557 /* construct a chunk from the first msg in the tx_msg queue */ 1558 ret = process_single_tx_qlock(mgr, txmsg, true); 1559 1560 if (ret != 1) 1561 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); 1562 1563 txmsg->dst->tx_slots[txmsg->seqno] = NULL; 1564 } 1565 1566 static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, 1567 struct drm_dp_sideband_msg_tx *txmsg) 1568 { 1569 mutex_lock(&mgr->qlock); 1570 list_add_tail(&txmsg->next, &mgr->tx_msg_downq); 1571 if (!mgr->tx_down_in_progress) 1572 process_single_down_tx_qlock(mgr); 1573 mutex_unlock(&mgr->qlock); 1574 } 1575 1576 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, 1577 struct drm_dp_mst_branch *mstb) 1578 { 1579 int len __unused; 1580 struct drm_dp_sideband_msg_tx *txmsg; 1581 int ret; 1582 1583 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1584 if (!txmsg) 1585 return; 1586 1587 txmsg->dst = mstb; 1588 len = build_link_address(txmsg); 1589 1590 mstb->link_address_sent = true; 1591 drm_dp_queue_down_tx(mgr, txmsg); 1592 1593 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1594 if (ret > 0) { 1595 int i; 1596 1597 if (txmsg->reply.reply_type == 1) 1598 DRM_DEBUG_KMS("link address nak received\n"); 1599 else { 1600 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); 1601 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { 1602 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, 1603 txmsg->reply.u.link_addr.ports[i].input_port, 1604 txmsg->reply.u.link_addr.ports[i].peer_device_type, 1605 txmsg->reply.u.link_addr.ports[i].port_number, 1606 txmsg->reply.u.link_addr.ports[i].dpcd_revision, 1607 txmsg->reply.u.link_addr.ports[i].mcs, 1608 txmsg->reply.u.link_addr.ports[i].ddps, 1609 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, 1610 txmsg->reply.u.link_addr.ports[i].num_sdp_streams, 1611 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); 1612 } 1613 1614 drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid); 1615 1616 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { 1617 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); 1618 } 1619 (*mgr->cbs->hotplug)(mgr); 1620 } 1621 } else { 1622 mstb->link_address_sent = false; 1623 DRM_DEBUG_KMS("link address failed %d\n", ret); 1624 } 1625 1626 kfree(txmsg); 1627 } 1628 1629 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, 1630 struct drm_dp_mst_branch *mstb, 1631 struct drm_dp_mst_port *port) 1632 { 1633 int len __unused; 1634 struct drm_dp_sideband_msg_tx *txmsg; 1635 int ret; 1636 1637 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1638 if (!txmsg) 1639 return -ENOMEM; 1640 1641 txmsg->dst = mstb; 1642 len = build_enum_path_resources(txmsg, port->port_num); 1643 1644 drm_dp_queue_down_tx(mgr, txmsg); 1645 1646 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1647 if (ret > 0) { 1648 if (txmsg->reply.reply_type == 1) 1649 DRM_DEBUG_KMS("enum path resources nak received\n"); 1650 else { 1651 if (port->port_num != txmsg->reply.u.path_resources.port_number) 1652 DRM_ERROR("got incorrect port in response\n"); 1653 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, 1654 txmsg->reply.u.path_resources.avail_payload_bw_number); 1655 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; 1656 } 1657 } 1658 1659 kfree(txmsg); 1660 return 0; 1661 } 1662 1663 static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) 1664 { 1665 if (!mstb->port_parent) 1666 return NULL; 1667 1668 if (mstb->port_parent->mstb != mstb) 1669 return mstb->port_parent; 1670 1671 return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); 1672 } 1673 1674 static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, 1675 struct drm_dp_mst_branch *mstb, 1676 int *port_num) 1677 { 1678 struct drm_dp_mst_branch *rmstb = NULL; 1679 struct drm_dp_mst_port *found_port; 1680 mutex_lock(&mgr->lock); 1681 if (mgr->mst_primary) { 1682 found_port = drm_dp_get_last_connected_port_to_mstb(mstb); 1683 1684 if (found_port) { 1685 rmstb = found_port->parent; 1686 kref_get(&rmstb->kref); 1687 *port_num = found_port->port_num; 1688 } 1689 } 1690 mutex_unlock(&mgr->lock); 1691 return rmstb; 1692 } 1693 1694 static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, 1695 struct drm_dp_mst_port *port, 1696 int id, 1697 int pbn) 1698 { 1699 struct drm_dp_sideband_msg_tx *txmsg; 1700 struct drm_dp_mst_branch *mstb; 1701 int len __unused, ret, port_num; 1702 1703 port = drm_dp_get_validated_port_ref(mgr, port); 1704 if (!port) 1705 return -EINVAL; 1706 1707 port_num = port->port_num; 1708 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); 1709 if (!mstb) { 1710 mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num); 1711 1712 if (!mstb) { 1713 drm_dp_put_port(port); 1714 return -EINVAL; 1715 } 1716 } 1717 1718 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1719 if (!txmsg) { 1720 ret = -ENOMEM; 1721 goto fail_put; 1722 } 1723 1724 txmsg->dst = mstb; 1725 len = build_allocate_payload(txmsg, port_num, 1726 id, 1727 pbn); 1728 1729 drm_dp_queue_down_tx(mgr, txmsg); 1730 1731 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1732 if (ret > 0) { 1733 if (txmsg->reply.reply_type == 1) { 1734 ret = -EINVAL; 1735 } else 1736 ret = 0; 1737 } 1738 kfree(txmsg); 1739 fail_put: 1740 drm_dp_put_mst_branch_device(mstb); 1741 drm_dp_put_port(port); 1742 return ret; 1743 } 1744 1745 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, 1746 int id, 1747 struct drm_dp_payload *payload) 1748 { 1749 int ret; 1750 1751 ret = drm_dp_dpcd_write_payload(mgr, id, payload); 1752 if (ret < 0) { 1753 payload->payload_state = 0; 1754 return ret; 1755 } 1756 payload->payload_state = DP_PAYLOAD_LOCAL; 1757 return 0; 1758 } 1759 1760 static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, 1761 struct drm_dp_mst_port *port, 1762 int id, 1763 struct drm_dp_payload *payload) 1764 { 1765 int ret; 1766 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); 1767 if (ret < 0) 1768 return ret; 1769 payload->payload_state = DP_PAYLOAD_REMOTE; 1770 return ret; 1771 } 1772 1773 static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, 1774 struct drm_dp_mst_port *port, 1775 int id, 1776 struct drm_dp_payload *payload) 1777 { 1778 DRM_DEBUG_KMS("\n"); 1779 /* its okay for these to fail */ 1780 if (port) { 1781 drm_dp_payload_send_msg(mgr, port, id, 0); 1782 } 1783 1784 drm_dp_dpcd_write_payload(mgr, id, payload); 1785 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; 1786 return 0; 1787 } 1788 1789 static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, 1790 int id, 1791 struct drm_dp_payload *payload) 1792 { 1793 payload->payload_state = 0; 1794 return 0; 1795 } 1796 1797 /** 1798 * drm_dp_update_payload_part1() - Execute payload update part 1 1799 * @mgr: manager to use. 1800 * 1801 * This iterates over all proposed virtual channels, and tries to 1802 * allocate space in the link for them. For 0->slots transitions, 1803 * this step just writes the VCPI to the MST device. For slots->0 1804 * transitions, this writes the updated VCPIs and removes the 1805 * remote VC payloads. 1806 * 1807 * after calling this the driver should generate ACT and payload 1808 * packets. 1809 */ 1810 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) 1811 { 1812 int i, j; 1813 int cur_slots = 1; 1814 struct drm_dp_payload req_payload; 1815 struct drm_dp_mst_port *port; 1816 1817 mutex_lock(&mgr->payload_lock); 1818 for (i = 0; i < mgr->max_payloads; i++) { 1819 /* solve the current payloads - compare to the hw ones 1820 - update the hw view */ 1821 req_payload.start_slot = cur_slots; 1822 if (mgr->proposed_vcpis[i]) { 1823 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); 1824 port = drm_dp_get_validated_port_ref(mgr, port); 1825 if (!port) { 1826 mutex_unlock(&mgr->payload_lock); 1827 return -EINVAL; 1828 } 1829 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; 1830 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi; 1831 } else { 1832 port = NULL; 1833 req_payload.num_slots = 0; 1834 } 1835 1836 if (mgr->payloads[i].start_slot != req_payload.start_slot) { 1837 mgr->payloads[i].start_slot = req_payload.start_slot; 1838 } 1839 /* work out what is required to happen with this payload */ 1840 if (mgr->payloads[i].num_slots != req_payload.num_slots) { 1841 1842 /* need to push an update for this payload */ 1843 if (req_payload.num_slots) { 1844 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload); 1845 mgr->payloads[i].num_slots = req_payload.num_slots; 1846 mgr->payloads[i].vcpi = req_payload.vcpi; 1847 } else if (mgr->payloads[i].num_slots) { 1848 mgr->payloads[i].num_slots = 0; 1849 drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]); 1850 req_payload.payload_state = mgr->payloads[i].payload_state; 1851 mgr->payloads[i].start_slot = 0; 1852 } 1853 mgr->payloads[i].payload_state = req_payload.payload_state; 1854 } 1855 cur_slots += req_payload.num_slots; 1856 1857 if (port) 1858 drm_dp_put_port(port); 1859 } 1860 1861 for (i = 0; i < mgr->max_payloads; i++) { 1862 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { 1863 DRM_DEBUG_KMS("removing payload %d\n", i); 1864 for (j = i; j < mgr->max_payloads - 1; j++) { 1865 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload)); 1866 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; 1867 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) { 1868 set_bit(j + 1, &mgr->payload_mask); 1869 } else { 1870 clear_bit(j + 1, &mgr->payload_mask); 1871 } 1872 } 1873 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload)); 1874 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; 1875 clear_bit(mgr->max_payloads, &mgr->payload_mask); 1876 1877 } 1878 } 1879 mutex_unlock(&mgr->payload_lock); 1880 1881 return 0; 1882 } 1883 EXPORT_SYMBOL(drm_dp_update_payload_part1); 1884 1885 /** 1886 * drm_dp_update_payload_part2() - Execute payload update part 2 1887 * @mgr: manager to use. 1888 * 1889 * This iterates over all proposed virtual channels, and tries to 1890 * allocate space in the link for them. For 0->slots transitions, 1891 * this step writes the remote VC payload commands. For slots->0 1892 * this just resets some internal state. 1893 */ 1894 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) 1895 { 1896 struct drm_dp_mst_port *port; 1897 int i; 1898 int ret = 0; 1899 mutex_lock(&mgr->payload_lock); 1900 for (i = 0; i < mgr->max_payloads; i++) { 1901 1902 if (!mgr->proposed_vcpis[i]) 1903 continue; 1904 1905 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); 1906 1907 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); 1908 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { 1909 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); 1910 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { 1911 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); 1912 } 1913 if (ret) { 1914 mutex_unlock(&mgr->payload_lock); 1915 return ret; 1916 } 1917 } 1918 mutex_unlock(&mgr->payload_lock); 1919 return 0; 1920 } 1921 EXPORT_SYMBOL(drm_dp_update_payload_part2); 1922 1923 #if 0 /* unused as of yet */ 1924 static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, 1925 struct drm_dp_mst_port *port, 1926 int offset, int size) 1927 { 1928 int len; 1929 struct drm_dp_sideband_msg_tx *txmsg; 1930 1931 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1932 if (!txmsg) 1933 return -ENOMEM; 1934 1935 len = build_dpcd_read(txmsg, port->port_num, 0, 8); 1936 txmsg->dst = port->parent; 1937 1938 drm_dp_queue_down_tx(mgr, txmsg); 1939 1940 return 0; 1941 } 1942 #endif 1943 1944 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, 1945 struct drm_dp_mst_port *port, 1946 int offset, int size, u8 *bytes) 1947 { 1948 int len __unused; 1949 int ret; 1950 struct drm_dp_sideband_msg_tx *txmsg; 1951 struct drm_dp_mst_branch *mstb; 1952 1953 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); 1954 if (!mstb) 1955 return -EINVAL; 1956 1957 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1958 if (!txmsg) { 1959 ret = -ENOMEM; 1960 goto fail_put; 1961 } 1962 1963 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); 1964 txmsg->dst = mstb; 1965 1966 drm_dp_queue_down_tx(mgr, txmsg); 1967 1968 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1969 if (ret > 0) { 1970 if (txmsg->reply.reply_type == 1) { 1971 ret = -EINVAL; 1972 } else 1973 ret = 0; 1974 } 1975 kfree(txmsg); 1976 fail_put: 1977 drm_dp_put_mst_branch_device(mstb); 1978 return ret; 1979 } 1980 1981 static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) 1982 { 1983 struct drm_dp_sideband_msg_reply_body reply; 1984 1985 reply.reply_type = 1; 1986 reply.req_type = req_type; 1987 drm_dp_encode_sideband_reply(&reply, msg); 1988 return 0; 1989 } 1990 1991 static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, 1992 struct drm_dp_mst_branch *mstb, 1993 int req_type, int seqno, bool broadcast) 1994 { 1995 struct drm_dp_sideband_msg_tx *txmsg; 1996 1997 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1998 if (!txmsg) 1999 return -ENOMEM; 2000 2001 txmsg->dst = mstb; 2002 txmsg->seqno = seqno; 2003 drm_dp_encode_up_ack_reply(txmsg, req_type); 2004 2005 mutex_lock(&mgr->qlock); 2006 2007 process_single_up_tx_qlock(mgr, txmsg); 2008 2009 mutex_unlock(&mgr->qlock); 2010 2011 kfree(txmsg); 2012 return 0; 2013 } 2014 2015 static bool drm_dp_get_vc_payload_bw(int dp_link_bw, 2016 int dp_link_count, 2017 int *out) 2018 { 2019 switch (dp_link_bw) { 2020 default: 2021 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n", 2022 dp_link_bw, dp_link_count); 2023 return false; 2024 2025 case DP_LINK_BW_1_62: 2026 *out = 3 * dp_link_count; 2027 break; 2028 case DP_LINK_BW_2_7: 2029 *out = 5 * dp_link_count; 2030 break; 2031 case DP_LINK_BW_5_4: 2032 *out = 10 * dp_link_count; 2033 break; 2034 } 2035 return true; 2036 } 2037 2038 /** 2039 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager 2040 * @mgr: manager to set state for 2041 * @mst_state: true to enable MST on this connector - false to disable. 2042 * 2043 * This is called by the driver when it detects an MST capable device plugged 2044 * into a DP MST capable port, or when a DP MST capable device is unplugged. 2045 */ 2046 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) 2047 { 2048 int ret = 0; 2049 struct drm_dp_mst_branch *mstb = NULL; 2050 2051 mutex_lock(&mgr->lock); 2052 if (mst_state == mgr->mst_state) 2053 goto out_unlock; 2054 2055 mgr->mst_state = mst_state; 2056 /* set the device into MST mode */ 2057 if (mst_state) { 2058 WARN_ON(mgr->mst_primary); 2059 2060 /* get dpcd info */ 2061 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); 2062 if (ret != DP_RECEIVER_CAP_SIZE) { 2063 DRM_DEBUG_KMS("failed to read DPCD\n"); 2064 goto out_unlock; 2065 } 2066 2067 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1], 2068 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, 2069 &mgr->pbn_div)) { 2070 ret = -EINVAL; 2071 goto out_unlock; 2072 } 2073 2074 mgr->total_pbn = 2560; 2075 mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div); 2076 mgr->avail_slots = mgr->total_slots; 2077 2078 /* add initial branch device at LCT 1 */ 2079 mstb = drm_dp_add_mst_branch_device(1, NULL); 2080 if (mstb == NULL) { 2081 ret = -ENOMEM; 2082 goto out_unlock; 2083 } 2084 mstb->mgr = mgr; 2085 2086 /* give this the main reference */ 2087 mgr->mst_primary = mstb; 2088 kref_get(&mgr->mst_primary->kref); 2089 2090 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 2091 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); 2092 if (ret < 0) { 2093 goto out_unlock; 2094 } 2095 2096 { 2097 struct drm_dp_payload reset_pay; 2098 reset_pay.start_slot = 0; 2099 reset_pay.num_slots = 0x3f; 2100 drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); 2101 } 2102 2103 queue_work(system_long_wq, &mgr->work); 2104 2105 ret = 0; 2106 } else { 2107 /* disable MST on the device */ 2108 mstb = mgr->mst_primary; 2109 mgr->mst_primary = NULL; 2110 /* this can fail if the device is gone */ 2111 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); 2112 ret = 0; 2113 memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); 2114 mgr->payload_mask = 0; 2115 set_bit(0, &mgr->payload_mask); 2116 mgr->vcpi_mask = 0; 2117 } 2118 2119 out_unlock: 2120 mutex_unlock(&mgr->lock); 2121 if (mstb) 2122 drm_dp_put_mst_branch_device(mstb); 2123 return ret; 2124 2125 } 2126 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); 2127 2128 /** 2129 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager 2130 * @mgr: manager to suspend 2131 * 2132 * This function tells the MST device that we can't handle UP messages 2133 * anymore. This should stop it from sending any since we are suspended. 2134 */ 2135 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) 2136 { 2137 mutex_lock(&mgr->lock); 2138 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 2139 DP_MST_EN | DP_UPSTREAM_IS_SRC); 2140 mutex_unlock(&mgr->lock); 2141 flush_work(&mgr->work); 2142 flush_work(&mgr->destroy_connector_work); 2143 } 2144 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); 2145 2146 /** 2147 * drm_dp_mst_topology_mgr_resume() - resume the MST manager 2148 * @mgr: manager to resume 2149 * 2150 * This will fetch DPCD and see if the device is still there, 2151 * if it is, it will rewrite the MSTM control bits, and return. 2152 * 2153 * if the device fails this returns -1, and the driver should do 2154 * a full MST reprobe, in case we were undocked. 2155 */ 2156 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) 2157 { 2158 int ret = 0; 2159 2160 mutex_lock(&mgr->lock); 2161 2162 if (mgr->mst_primary) { 2163 int sret; 2164 u8 guid[16]; 2165 2166 sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); 2167 if (sret != DP_RECEIVER_CAP_SIZE) { 2168 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); 2169 ret = -1; 2170 goto out_unlock; 2171 } 2172 2173 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 2174 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); 2175 if (ret < 0) { 2176 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); 2177 ret = -1; 2178 goto out_unlock; 2179 } 2180 2181 /* Some hubs forget their guids after they resume */ 2182 sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); 2183 if (sret != 16) { 2184 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); 2185 ret = -1; 2186 goto out_unlock; 2187 } 2188 drm_dp_check_mstb_guid(mgr->mst_primary, guid); 2189 2190 ret = 0; 2191 } else 2192 ret = -1; 2193 2194 out_unlock: 2195 mutex_unlock(&mgr->lock); 2196 return ret; 2197 } 2198 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); 2199 2200 static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) 2201 { 2202 int len; 2203 u8 replyblock[32]; 2204 int replylen, origlen __unused, curreply; 2205 int ret; 2206 struct drm_dp_sideband_msg_rx *msg; 2207 int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; 2208 msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; 2209 2210 len = min(mgr->max_dpcd_transaction_bytes, 16); 2211 ret = drm_dp_dpcd_read(mgr->aux, basereg, 2212 replyblock, len); 2213 if (ret != len) { 2214 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); 2215 return false; 2216 } 2217 ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); 2218 if (!ret) { 2219 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); 2220 return false; 2221 } 2222 replylen = msg->curchunk_len + msg->curchunk_hdrlen; 2223 2224 origlen = replylen; 2225 replylen -= len; 2226 curreply = len; 2227 while (replylen > 0) { 2228 len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); 2229 ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, 2230 replyblock, len); 2231 if (ret != len) { 2232 DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n", 2233 len, ret); 2234 return false; 2235 } 2236 2237 ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); 2238 if (!ret) { 2239 DRM_DEBUG_KMS("failed to build sideband msg\n"); 2240 return false; 2241 } 2242 2243 curreply += len; 2244 replylen -= len; 2245 } 2246 return true; 2247 } 2248 2249 static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) 2250 { 2251 int ret = 0; 2252 2253 if (!drm_dp_get_one_sb_msg(mgr, false)) { 2254 memset(&mgr->down_rep_recv, 0, 2255 sizeof(struct drm_dp_sideband_msg_rx)); 2256 return 0; 2257 } 2258 2259 if (mgr->down_rep_recv.have_eomt) { 2260 struct drm_dp_sideband_msg_tx *txmsg; 2261 struct drm_dp_mst_branch *mstb; 2262 int slot = -1; 2263 mstb = drm_dp_get_mst_branch_device(mgr, 2264 mgr->down_rep_recv.initial_hdr.lct, 2265 mgr->down_rep_recv.initial_hdr.rad); 2266 2267 if (!mstb) { 2268 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); 2269 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2270 return 0; 2271 } 2272 2273 /* find the message */ 2274 slot = mgr->down_rep_recv.initial_hdr.seqno; 2275 mutex_lock(&mgr->qlock); 2276 txmsg = mstb->tx_slots[slot]; 2277 /* remove from slots */ 2278 mutex_unlock(&mgr->qlock); 2279 2280 if (!txmsg) { 2281 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", 2282 mstb, 2283 mgr->down_rep_recv.initial_hdr.seqno, 2284 mgr->down_rep_recv.initial_hdr.lct, 2285 mgr->down_rep_recv.initial_hdr.rad[0], 2286 mgr->down_rep_recv.msg[0]); 2287 drm_dp_put_mst_branch_device(mstb); 2288 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2289 return 0; 2290 } 2291 2292 drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); 2293 if (txmsg->reply.reply_type == 1) { 2294 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); 2295 } 2296 2297 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2298 drm_dp_put_mst_branch_device(mstb); 2299 2300 mutex_lock(&mgr->qlock); 2301 txmsg->state = DRM_DP_SIDEBAND_TX_RX; 2302 mstb->tx_slots[slot] = NULL; 2303 #ifdef __NetBSD__ 2304 DRM_WAKEUP_ONE(&mstb->mgr->tx_waitq, &mstb->mgr->qlock); 2305 mutex_unlock(&mgr->qlock); 2306 #else 2307 mutex_unlock(&mgr->qlock); 2308 2309 wake_up(&mgr->tx_waitq); 2310 #endif 2311 } 2312 return ret; 2313 } 2314 2315 static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) 2316 { 2317 int ret = 0; 2318 2319 if (!drm_dp_get_one_sb_msg(mgr, true)) { 2320 memset(&mgr->up_req_recv, 0, 2321 sizeof(struct drm_dp_sideband_msg_rx)); 2322 return 0; 2323 } 2324 2325 if (mgr->up_req_recv.have_eomt) { 2326 struct drm_dp_sideband_msg_req_body msg; 2327 struct drm_dp_mst_branch *mstb = NULL; 2328 bool seqno; 2329 2330 if (!mgr->up_req_recv.initial_hdr.broadcast) { 2331 mstb = drm_dp_get_mst_branch_device(mgr, 2332 mgr->up_req_recv.initial_hdr.lct, 2333 mgr->up_req_recv.initial_hdr.rad); 2334 if (!mstb) { 2335 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); 2336 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2337 return 0; 2338 } 2339 } 2340 2341 seqno = mgr->up_req_recv.initial_hdr.seqno; 2342 drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); 2343 2344 if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { 2345 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); 2346 2347 if (!mstb) 2348 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid); 2349 2350 if (!mstb) { 2351 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); 2352 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2353 return 0; 2354 } 2355 2356 drm_dp_update_port(mstb, &msg.u.conn_stat); 2357 2358 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); 2359 (*mgr->cbs->hotplug)(mgr); 2360 2361 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { 2362 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); 2363 if (!mstb) 2364 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid); 2365 2366 if (!mstb) { 2367 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); 2368 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2369 return 0; 2370 } 2371 2372 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); 2373 } 2374 2375 if (mstb) 2376 drm_dp_put_mst_branch_device(mstb); 2377 2378 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2379 } 2380 return ret; 2381 } 2382 2383 /** 2384 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify 2385 * @mgr: manager to notify irq for. 2386 * @esi: 4 bytes from SINK_COUNT_ESI 2387 * @handled: whether the hpd interrupt was consumed or not 2388 * 2389 * This should be called from the driver when it detects a short IRQ, 2390 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The 2391 * topology manager will process the sideband messages received as a result 2392 * of this. 2393 */ 2394 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) 2395 { 2396 int ret = 0; 2397 int sc; 2398 *handled = false; 2399 sc = esi[0] & 0x3f; 2400 2401 if (sc != mgr->sink_count) { 2402 mgr->sink_count = sc; 2403 *handled = true; 2404 } 2405 2406 if (esi[1] & DP_DOWN_REP_MSG_RDY) { 2407 ret = drm_dp_mst_handle_down_rep(mgr); 2408 *handled = true; 2409 } 2410 2411 if (esi[1] & DP_UP_REQ_MSG_RDY) { 2412 ret |= drm_dp_mst_handle_up_req(mgr); 2413 *handled = true; 2414 } 2415 2416 drm_dp_mst_kick_tx(mgr); 2417 return ret; 2418 } 2419 EXPORT_SYMBOL(drm_dp_mst_hpd_irq); 2420 2421 /** 2422 * drm_dp_mst_detect_port() - get connection status for an MST port 2423 * @mgr: manager for this port 2424 * @port: unverified pointer to a port 2425 * 2426 * This returns the current connection state for a port. It validates the 2427 * port pointer still exists so the caller doesn't require a reference 2428 */ 2429 enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, 2430 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2431 { 2432 enum drm_connector_status status = connector_status_disconnected; 2433 2434 /* we need to search for the port in the mgr in case its gone */ 2435 port = drm_dp_get_validated_port_ref(mgr, port); 2436 if (!port) 2437 return connector_status_disconnected; 2438 2439 if (!port->ddps) 2440 goto out; 2441 2442 switch (port->pdt) { 2443 case DP_PEER_DEVICE_NONE: 2444 case DP_PEER_DEVICE_MST_BRANCHING: 2445 break; 2446 2447 case DP_PEER_DEVICE_SST_SINK: 2448 status = connector_status_connected; 2449 /* for logical ports - cache the EDID */ 2450 if (port->port_num >= 8 && !port->cached_edid) { 2451 port->cached_edid = drm_get_edid(connector, &port->aux.ddc); 2452 } 2453 break; 2454 case DP_PEER_DEVICE_DP_LEGACY_CONV: 2455 if (port->ldps) 2456 status = connector_status_connected; 2457 break; 2458 } 2459 out: 2460 drm_dp_put_port(port); 2461 return status; 2462 } 2463 EXPORT_SYMBOL(drm_dp_mst_detect_port); 2464 2465 /** 2466 * drm_dp_mst_get_edid() - get EDID for an MST port 2467 * @connector: toplevel connector to get EDID for 2468 * @mgr: manager for this port 2469 * @port: unverified pointer to a port. 2470 * 2471 * This returns an EDID for the port connected to a connector, 2472 * It validates the pointer still exists so the caller doesn't require a 2473 * reference. 2474 */ 2475 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2476 { 2477 struct edid *edid = NULL; 2478 2479 /* we need to search for the port in the mgr in case its gone */ 2480 port = drm_dp_get_validated_port_ref(mgr, port); 2481 if (!port) 2482 return NULL; 2483 2484 if (port->cached_edid) 2485 edid = drm_edid_duplicate(port->cached_edid); 2486 else { 2487 edid = drm_get_edid(connector, &port->aux.ddc); 2488 drm_mode_connector_set_tile_property(connector); 2489 } 2490 drm_dp_put_port(port); 2491 return edid; 2492 } 2493 EXPORT_SYMBOL(drm_dp_mst_get_edid); 2494 2495 /** 2496 * drm_dp_find_vcpi_slots() - find slots for this PBN value 2497 * @mgr: manager to use 2498 * @pbn: payload bandwidth to convert into slots. 2499 */ 2500 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, 2501 int pbn) 2502 { 2503 int num_slots; 2504 2505 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); 2506 2507 if (num_slots > mgr->avail_slots) 2508 return -ENOSPC; 2509 return num_slots; 2510 } 2511 EXPORT_SYMBOL(drm_dp_find_vcpi_slots); 2512 2513 static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, 2514 struct drm_dp_vcpi *vcpi, int pbn) 2515 { 2516 int num_slots; 2517 int ret; 2518 2519 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); 2520 2521 if (num_slots > mgr->avail_slots) 2522 return -ENOSPC; 2523 2524 vcpi->pbn = pbn; 2525 vcpi->aligned_pbn = num_slots * mgr->pbn_div; 2526 vcpi->num_slots = num_slots; 2527 2528 ret = drm_dp_mst_assign_payload_id(mgr, vcpi); 2529 if (ret < 0) 2530 return ret; 2531 return 0; 2532 } 2533 2534 /** 2535 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel 2536 * @mgr: manager for this port 2537 * @port: port to allocate a virtual channel for. 2538 * @pbn: payload bandwidth number to request 2539 * @slots: returned number of slots for this PBN. 2540 */ 2541 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots) 2542 { 2543 int ret; 2544 2545 port = drm_dp_get_validated_port_ref(mgr, port); 2546 if (!port) 2547 return false; 2548 2549 if (port->vcpi.vcpi > 0) { 2550 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); 2551 if (pbn == port->vcpi.pbn) { 2552 *slots = port->vcpi.num_slots; 2553 drm_dp_put_port(port); 2554 return true; 2555 } 2556 } 2557 2558 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn); 2559 if (ret) { 2560 DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret); 2561 goto out; 2562 } 2563 DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); 2564 *slots = port->vcpi.num_slots; 2565 2566 drm_dp_put_port(port); 2567 return true; 2568 out: 2569 return false; 2570 } 2571 EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); 2572 2573 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2574 { 2575 int slots = 0; 2576 port = drm_dp_get_validated_port_ref(mgr, port); 2577 if (!port) 2578 return slots; 2579 2580 slots = port->vcpi.num_slots; 2581 drm_dp_put_port(port); 2582 return slots; 2583 } 2584 EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots); 2585 2586 /** 2587 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI 2588 * @mgr: manager for this port 2589 * @port: unverified pointer to a port. 2590 * 2591 * This just resets the number of slots for the ports VCPI for later programming. 2592 */ 2593 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2594 { 2595 port = drm_dp_get_validated_port_ref(mgr, port); 2596 if (!port) 2597 return; 2598 port->vcpi.num_slots = 0; 2599 drm_dp_put_port(port); 2600 } 2601 EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); 2602 2603 /** 2604 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI 2605 * @mgr: manager for this port 2606 * @port: unverified port to deallocate vcpi for 2607 */ 2608 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2609 { 2610 port = drm_dp_get_validated_port_ref(mgr, port); 2611 if (!port) 2612 return; 2613 2614 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); 2615 port->vcpi.num_slots = 0; 2616 port->vcpi.pbn = 0; 2617 port->vcpi.aligned_pbn = 0; 2618 port->vcpi.vcpi = 0; 2619 drm_dp_put_port(port); 2620 } 2621 EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); 2622 2623 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, 2624 int id, struct drm_dp_payload *payload) 2625 { 2626 u8 payload_alloc[3], status; 2627 int ret; 2628 int retries = 0; 2629 2630 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, 2631 DP_PAYLOAD_TABLE_UPDATED); 2632 2633 payload_alloc[0] = id; 2634 payload_alloc[1] = payload->start_slot; 2635 payload_alloc[2] = payload->num_slots; 2636 2637 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); 2638 if (ret != 3) { 2639 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); 2640 goto fail; 2641 } 2642 2643 retry: 2644 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); 2645 if (ret < 0) { 2646 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); 2647 goto fail; 2648 } 2649 2650 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { 2651 retries++; 2652 if (retries < 20) { 2653 usleep_range(10000, 20000); 2654 goto retry; 2655 } 2656 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); 2657 ret = -EINVAL; 2658 goto fail; 2659 } 2660 ret = 0; 2661 fail: 2662 return ret; 2663 } 2664 2665 2666 /** 2667 * drm_dp_check_act_status() - Check ACT handled status. 2668 * @mgr: manager to use 2669 * 2670 * Check the payload status bits in the DPCD for ACT handled completion. 2671 */ 2672 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) 2673 { 2674 u8 status; 2675 int ret; 2676 int count = 0; 2677 2678 do { 2679 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); 2680 2681 if (ret < 0) { 2682 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); 2683 goto fail; 2684 } 2685 2686 if (status & DP_PAYLOAD_ACT_HANDLED) 2687 break; 2688 count++; 2689 udelay(100); 2690 2691 } while (count < 30); 2692 2693 if (!(status & DP_PAYLOAD_ACT_HANDLED)) { 2694 DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); 2695 ret = -EINVAL; 2696 goto fail; 2697 } 2698 return 0; 2699 fail: 2700 return ret; 2701 } 2702 EXPORT_SYMBOL(drm_dp_check_act_status); 2703 2704 /** 2705 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. 2706 * @clock: dot clock for the mode 2707 * @bpp: bpp for the mode. 2708 * 2709 * This uses the formula in the spec to calculate the PBN value for a mode. 2710 */ 2711 int drm_dp_calc_pbn_mode(int clock, int bpp) 2712 { 2713 u64 kbps; 2714 s64 peak_kbps; 2715 u32 numerator; 2716 u32 denominator; 2717 2718 kbps = clock * bpp; 2719 2720 /* 2721 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006 2722 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on 2723 * common multiplier to render an integer PBN for all link rate/lane 2724 * counts combinations 2725 * calculate 2726 * peak_kbps *= (1006/1000) 2727 * peak_kbps *= (64/54) 2728 * peak_kbps *= 8 convert to bytes 2729 */ 2730 2731 numerator = 64 * 1006; 2732 denominator = 54 * 8 * 1000 * 1000; 2733 2734 kbps *= numerator; 2735 peak_kbps = drm_fixp_from_fraction(kbps, denominator); 2736 2737 return drm_fixp2int_ceil(peak_kbps); 2738 } 2739 EXPORT_SYMBOL(drm_dp_calc_pbn_mode); 2740 2741 static int test_calc_pbn_mode(void) 2742 { 2743 int ret; 2744 ret = drm_dp_calc_pbn_mode(154000, 30); 2745 if (ret != 689) { 2746 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", 2747 154000, 30, 689, ret); 2748 return -EINVAL; 2749 } 2750 ret = drm_dp_calc_pbn_mode(234000, 30); 2751 if (ret != 1047) { 2752 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", 2753 234000, 30, 1047, ret); 2754 return -EINVAL; 2755 } 2756 ret = drm_dp_calc_pbn_mode(297000, 24); 2757 if (ret != 1063) { 2758 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", 2759 297000, 24, 1063, ret); 2760 return -EINVAL; 2761 } 2762 return 0; 2763 } 2764 2765 /* we want to kick the TX after we've ack the up/down IRQs. */ 2766 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) 2767 { 2768 queue_work(system_long_wq, &mgr->tx_work); 2769 } 2770 2771 #if IS_ENABLED(CONFIG_DEBUG_FS) 2772 static void drm_dp_mst_dump_mstb(struct seq_file *m, 2773 struct drm_dp_mst_branch *mstb) 2774 { 2775 struct drm_dp_mst_port *port; 2776 int tabs = mstb->lct; 2777 char prefix[10]; 2778 int i; 2779 2780 for (i = 0; i < tabs; i++) 2781 prefix[i] = '\t'; 2782 prefix[i] = '\0'; 2783 2784 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); 2785 list_for_each_entry(port, &mstb->ports, next) { 2786 seq_printf(m, "%sport: %d: ddps: %d ldps: %d, %p, conn: %p\n", prefix, port->port_num, port->ddps, port->ldps, port, port->connector); 2787 if (port->mstb) 2788 drm_dp_mst_dump_mstb(m, port->mstb); 2789 } 2790 } 2791 2792 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, 2793 char *buf) 2794 { 2795 int ret; 2796 int i; 2797 for (i = 0; i < 4; i++) { 2798 ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16); 2799 if (ret != 16) 2800 break; 2801 } 2802 if (i == 4) 2803 return true; 2804 return false; 2805 } 2806 2807 /** 2808 * drm_dp_mst_dump_topology(): dump topology to seq file. 2809 * @m: seq_file to dump output to 2810 * @mgr: manager to dump current topology for. 2811 * 2812 * helper to dump MST topology to a seq file for debugfs. 2813 */ 2814 void drm_dp_mst_dump_topology(struct seq_file *m, 2815 struct drm_dp_mst_topology_mgr *mgr) 2816 { 2817 int i; 2818 struct drm_dp_mst_port *port; 2819 mutex_lock(&mgr->lock); 2820 if (mgr->mst_primary) 2821 drm_dp_mst_dump_mstb(m, mgr->mst_primary); 2822 2823 /* dump VCPIs */ 2824 mutex_unlock(&mgr->lock); 2825 2826 mutex_lock(&mgr->payload_lock); 2827 seq_printf(m, "vcpi: %lx %lx\n", mgr->payload_mask, mgr->vcpi_mask); 2828 2829 for (i = 0; i < mgr->max_payloads; i++) { 2830 if (mgr->proposed_vcpis[i]) { 2831 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); 2832 seq_printf(m, "vcpi %d: %d %d %d\n", i, port->port_num, port->vcpi.vcpi, port->vcpi.num_slots); 2833 } else 2834 seq_printf(m, "vcpi %d:unsed\n", i); 2835 } 2836 for (i = 0; i < mgr->max_payloads; i++) { 2837 seq_printf(m, "payload %d: %d, %d, %d\n", 2838 i, 2839 mgr->payloads[i].payload_state, 2840 mgr->payloads[i].start_slot, 2841 mgr->payloads[i].num_slots); 2842 2843 2844 } 2845 mutex_unlock(&mgr->payload_lock); 2846 2847 mutex_lock(&mgr->lock); 2848 if (mgr->mst_primary) { 2849 u8 buf[64]; 2850 bool bret; 2851 int ret; 2852 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); 2853 seq_printf(m, "dpcd: "); 2854 for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++) 2855 seq_printf(m, "%02x ", buf[i]); 2856 seq_printf(m, "\n"); 2857 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); 2858 seq_printf(m, "faux/mst: "); 2859 for (i = 0; i < 2; i++) 2860 seq_printf(m, "%02x ", buf[i]); 2861 seq_printf(m, "\n"); 2862 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); 2863 seq_printf(m, "mst ctrl: "); 2864 for (i = 0; i < 1; i++) 2865 seq_printf(m, "%02x ", buf[i]); 2866 seq_printf(m, "\n"); 2867 2868 /* dump the standard OUI branch header */ 2869 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); 2870 seq_printf(m, "branch oui: "); 2871 for (i = 0; i < 0x3; i++) 2872 seq_printf(m, "%02x", buf[i]); 2873 seq_printf(m, " devid: "); 2874 for (i = 0x3; i < 0x8; i++) 2875 seq_printf(m, "%c", buf[i]); 2876 seq_printf(m, " revision: hw: %x.%x sw: %x.%x", buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]); 2877 seq_printf(m, "\n"); 2878 bret = dump_dp_payload_table(mgr, buf); 2879 if (bret == true) { 2880 seq_printf(m, "payload table: "); 2881 for (i = 0; i < 63; i++) 2882 seq_printf(m, "%02x ", buf[i]); 2883 seq_printf(m, "\n"); 2884 } 2885 2886 } 2887 2888 mutex_unlock(&mgr->lock); 2889 2890 } 2891 EXPORT_SYMBOL(drm_dp_mst_dump_topology); 2892 #endif /* IS_ENABLED(CONFIG_DEBUG_FS) */ 2893 2894 static void drm_dp_tx_work(struct work_struct *work) 2895 { 2896 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); 2897 2898 mutex_lock(&mgr->qlock); 2899 if (mgr->tx_down_in_progress) 2900 process_single_down_tx_qlock(mgr); 2901 mutex_unlock(&mgr->qlock); 2902 } 2903 2904 static void drm_dp_free_mst_port(struct kref *kref) 2905 { 2906 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); 2907 kref_put(&port->parent->kref, drm_dp_free_mst_branch_device); 2908 kfree(port); 2909 } 2910 2911 static void drm_dp_destroy_connector_work(struct work_struct *work) 2912 { 2913 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work); 2914 struct drm_dp_mst_port *port; 2915 bool send_hotplug = false; 2916 /* 2917 * Not a regular list traverse as we have to drop the destroy 2918 * connector lock before destroying the connector, to avoid AB->BA 2919 * ordering between this lock and the config mutex. 2920 */ 2921 for (;;) { 2922 mutex_lock(&mgr->destroy_connector_lock); 2923 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next); 2924 if (!port) { 2925 mutex_unlock(&mgr->destroy_connector_lock); 2926 break; 2927 } 2928 list_del(&port->next); 2929 mutex_unlock(&mgr->destroy_connector_lock); 2930 2931 kref_init(&port->kref); 2932 INIT_LIST_HEAD(&port->next); 2933 2934 mgr->cbs->destroy_connector(mgr, port->connector); 2935 2936 drm_dp_port_teardown_pdt(port, port->pdt); 2937 port->pdt = DP_PEER_DEVICE_NONE; 2938 2939 if (!port->input && port->vcpi.vcpi > 0) { 2940 drm_dp_mst_reset_vcpi_slots(mgr, port); 2941 drm_dp_update_payload_part1(mgr); 2942 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); 2943 } 2944 2945 kref_put(&port->kref, drm_dp_free_mst_port); 2946 send_hotplug = true; 2947 } 2948 if (send_hotplug) 2949 (*mgr->cbs->hotplug)(mgr); 2950 } 2951 2952 /** 2953 * drm_dp_mst_topology_mgr_init - initialise a topology manager 2954 * @mgr: manager struct to initialise 2955 * @dev: device providing this structure - for i2c addition. 2956 * @aux: DP helper aux channel to talk to this device 2957 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit 2958 * @max_payloads: maximum number of payloads this GPU can source 2959 * @conn_base_id: the connector object ID the MST device is connected to. 2960 * 2961 * Return 0 for success, or negative error code on failure 2962 */ 2963 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, 2964 struct device *dev, struct drm_dp_aux *aux, 2965 int max_dpcd_transaction_bytes, 2966 int max_payloads, int conn_base_id) 2967 { 2968 mutex_init(&mgr->lock); 2969 mutex_init(&mgr->qlock); 2970 mutex_init(&mgr->payload_lock); 2971 mutex_init(&mgr->destroy_connector_lock); 2972 INIT_LIST_HEAD(&mgr->tx_msg_downq); 2973 INIT_LIST_HEAD(&mgr->destroy_connector_list); 2974 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); 2975 INIT_WORK(&mgr->tx_work, drm_dp_tx_work); 2976 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work); 2977 #ifdef __NetBSD__ 2978 DRM_INIT_WAITQUEUE(&mgr->tx_waitq, "dpmstwait"); 2979 #else 2980 init_waitqueue_head(&mgr->tx_waitq); 2981 #endif 2982 mgr->dev = dev; 2983 mgr->aux = aux; 2984 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; 2985 mgr->max_payloads = max_payloads; 2986 mgr->conn_base_id = conn_base_id; 2987 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); 2988 if (!mgr->payloads) 2989 return -ENOMEM; 2990 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); 2991 if (!mgr->proposed_vcpis) 2992 return -ENOMEM; 2993 set_bit(0, &mgr->payload_mask); 2994 test_calc_pbn_mode(); 2995 return 0; 2996 } 2997 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); 2998 2999 /** 3000 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. 3001 * @mgr: manager to destroy 3002 */ 3003 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) 3004 { 3005 flush_work(&mgr->work); 3006 flush_work(&mgr->destroy_connector_work); 3007 mutex_lock(&mgr->payload_lock); 3008 kfree(mgr->payloads); 3009 mgr->payloads = NULL; 3010 kfree(mgr->proposed_vcpis); 3011 mgr->proposed_vcpis = NULL; 3012 mutex_unlock(&mgr->payload_lock); 3013 mgr->dev = NULL; 3014 mgr->aux = NULL; 3015 #ifdef __NetBSD__ 3016 DRM_DESTROY_WAITQUEUE(&mgr->tx_waitq); 3017 #endif 3018 mutex_destroy(&mgr->destroy_connector_lock); 3019 mutex_destroy(&mgr->payload_lock); 3020 mutex_destroy(&mgr->qlock); 3021 mutex_destroy(&mgr->lock); 3022 } 3023 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); 3024 3025 /* I2C device */ 3026 static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, 3027 int num) 3028 { 3029 struct drm_dp_aux *aux = adapter->algo_data; 3030 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); 3031 struct drm_dp_mst_branch *mstb; 3032 struct drm_dp_mst_topology_mgr *mgr = port->mgr; 3033 unsigned int i; 3034 bool reading = false; 3035 struct drm_dp_sideband_msg_req_body msg; 3036 struct drm_dp_sideband_msg_tx *txmsg = NULL; 3037 int ret; 3038 3039 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); 3040 if (!mstb) 3041 return -EREMOTEIO; 3042 3043 /* construct i2c msg */ 3044 /* see if last msg is a read */ 3045 if (msgs[num - 1].flags & I2C_M_RD) 3046 reading = true; 3047 3048 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) { 3049 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); 3050 ret = -EIO; 3051 goto out; 3052 } 3053 3054 memset(&msg, 0, sizeof(msg)); 3055 msg.req_type = DP_REMOTE_I2C_READ; 3056 msg.u.i2c_read.num_transactions = num - 1; 3057 msg.u.i2c_read.port_number = port->port_num; 3058 for (i = 0; i < num - 1; i++) { 3059 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; 3060 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; 3061 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; 3062 } 3063 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; 3064 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; 3065 3066 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 3067 if (!txmsg) { 3068 ret = -ENOMEM; 3069 goto out; 3070 } 3071 3072 txmsg->dst = mstb; 3073 drm_dp_encode_sideband_req(&msg, txmsg); 3074 3075 drm_dp_queue_down_tx(mgr, txmsg); 3076 3077 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 3078 if (ret > 0) { 3079 3080 if (txmsg->reply.reply_type == 1) { /* got a NAK back */ 3081 ret = -EREMOTEIO; 3082 goto out; 3083 } 3084 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { 3085 ret = -EIO; 3086 goto out; 3087 } 3088 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); 3089 ret = num; 3090 } 3091 out: 3092 kfree(txmsg); 3093 drm_dp_put_mst_branch_device(mstb); 3094 return ret; 3095 } 3096 3097 static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) 3098 { 3099 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | 3100 I2C_FUNC_SMBUS_READ_BLOCK_DATA | 3101 I2C_FUNC_SMBUS_BLOCK_PROC_CALL | 3102 I2C_FUNC_10BIT_ADDR; 3103 } 3104 3105 static const struct i2c_algorithm drm_dp_mst_i2c_algo = { 3106 .functionality = drm_dp_mst_i2c_functionality, 3107 .master_xfer = drm_dp_mst_i2c_xfer, 3108 }; 3109 3110 /** 3111 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX 3112 * @aux: DisplayPort AUX channel 3113 * 3114 * Returns 0 on success or a negative error code on failure. 3115 */ 3116 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) 3117 { 3118 aux->ddc.algo = &drm_dp_mst_i2c_algo; 3119 aux->ddc.algo_data = aux; 3120 aux->ddc.retries = 3; 3121 3122 aux->ddc.class = I2C_CLASS_DDC; 3123 aux->ddc.owner = THIS_MODULE; 3124 aux->ddc.dev.parent = aux->dev; 3125 #ifndef __NetBSD__ /* XXX of? */ 3126 aux->ddc.dev.of_node = aux->dev->of_node; 3127 #endif 3128 3129 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), 3130 sizeof(aux->ddc.name)); 3131 3132 return i2c_add_adapter(&aux->ddc); 3133 } 3134 3135 /** 3136 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter 3137 * @aux: DisplayPort AUX channel 3138 */ 3139 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) 3140 { 3141 i2c_del_adapter(&aux->ddc); 3142 } 3143
Indexes created Wed Oct 01 18:09:54 GMT 2025