drm_dp_mst_topology.c revision 1.4
1 /* $NetBSD: drm_dp_mst_topology.c,v 1.4 2020/02/14 04:35:19 riastradh 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 1.4 2020/02/14 04:35:19 riastradh 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 <linux/device.h> 36 #include <linux/export.h> 37 #include <linux/module.h> 38 #include <drm/drm_dp_mst_helper.h> 39 #include <drm/drmP.h> 40 41 #include <drm/drm_fixed.h> 42 43 #include <linux/nbsd-namespace.h> 44 45 /** 46 * DOC: dp mst helper 47 * 48 * These functions contain parts of the DisplayPort 1.2a MultiStream Transport 49 * protocol. The helpers contain a topology manager and bandwidth manager. 50 * The helpers encapsulate the sending and received of sideband msgs. 51 */ 52 #if IS_ENABLED(CONFIG_DEBUG_FS) 53 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, 54 char *buf); 55 #endif 56 static int test_calc_pbn_mode(void); 57 58 static void drm_dp_put_port(struct drm_dp_mst_port *port); 59 60 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, 61 int id, 62 struct drm_dp_payload *payload); 63 64 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, 65 struct drm_dp_mst_port *port, 66 int offset, int size, u8 *bytes); 67 68 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, 69 struct drm_dp_mst_branch *mstb); 70 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, 71 struct drm_dp_mst_branch *mstb, 72 struct drm_dp_mst_port *port); 73 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, 74 u8 *guid); 75 76 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); 77 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); 78 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); 79 /* sideband msg handling */ 80 static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) 81 { 82 u8 bitmask = 0x80; 83 u8 bitshift = 7; 84 u8 array_index = 0; 85 int number_of_bits = num_nibbles * 4; 86 u8 remainder = 0; 87 88 while (number_of_bits != 0) { 89 number_of_bits--; 90 remainder <<= 1; 91 remainder |= (data[array_index] & bitmask) >> bitshift; 92 bitmask >>= 1; 93 bitshift--; 94 if (bitmask == 0) { 95 bitmask = 0x80; 96 bitshift = 7; 97 array_index++; 98 } 99 if ((remainder & 0x10) == 0x10) 100 remainder ^= 0x13; 101 } 102 103 number_of_bits = 4; 104 while (number_of_bits != 0) { 105 number_of_bits--; 106 remainder <<= 1; 107 if ((remainder & 0x10) != 0) 108 remainder ^= 0x13; 109 } 110 111 return remainder; 112 } 113 114 static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) 115 { 116 u8 bitmask = 0x80; 117 u8 bitshift = 7; 118 u8 array_index = 0; 119 int number_of_bits = number_of_bytes * 8; 120 u16 remainder = 0; 121 122 while (number_of_bits != 0) { 123 number_of_bits--; 124 remainder <<= 1; 125 remainder |= (data[array_index] & bitmask) >> bitshift; 126 bitmask >>= 1; 127 bitshift--; 128 if (bitmask == 0) { 129 bitmask = 0x80; 130 bitshift = 7; 131 array_index++; 132 } 133 if ((remainder & 0x100) == 0x100) 134 remainder ^= 0xd5; 135 } 136 137 number_of_bits = 8; 138 while (number_of_bits != 0) { 139 number_of_bits--; 140 remainder <<= 1; 141 if ((remainder & 0x100) != 0) 142 remainder ^= 0xd5; 143 } 144 145 return remainder & 0xff; 146 } 147 static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) 148 { 149 u8 size = 3; 150 size += (hdr->lct / 2); 151 return size; 152 } 153 154 static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, 155 u8 *buf, int *len) 156 { 157 int idx = 0; 158 int i; 159 u8 crc4; 160 buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); 161 for (i = 0; i < (hdr->lct / 2); i++) 162 buf[idx++] = hdr->rad[i]; 163 buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | 164 (hdr->msg_len & 0x3f); 165 buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); 166 167 crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); 168 buf[idx - 1] |= (crc4 & 0xf); 169 170 *len = idx; 171 } 172 173 static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, 174 u8 *buf, int buflen, u8 *hdrlen) 175 { 176 u8 crc4; 177 u8 len; 178 int i; 179 u8 idx; 180 if (buf[0] == 0) 181 return false; 182 len = 3; 183 len += ((buf[0] & 0xf0) >> 4) / 2; 184 if (len > buflen) 185 return false; 186 crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); 187 188 if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { 189 DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); 190 return false; 191 } 192 193 hdr->lct = (buf[0] & 0xf0) >> 4; 194 hdr->lcr = (buf[0] & 0xf); 195 idx = 1; 196 for (i = 0; i < (hdr->lct / 2); i++) 197 hdr->rad[i] = buf[idx++]; 198 hdr->broadcast = (buf[idx] >> 7) & 0x1; 199 hdr->path_msg = (buf[idx] >> 6) & 0x1; 200 hdr->msg_len = buf[idx] & 0x3f; 201 idx++; 202 hdr->somt = (buf[idx] >> 7) & 0x1; 203 hdr->eomt = (buf[idx] >> 6) & 0x1; 204 hdr->seqno = (buf[idx] >> 4) & 0x1; 205 idx++; 206 *hdrlen = idx; 207 return true; 208 } 209 210 static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, 211 struct drm_dp_sideband_msg_tx *raw) 212 { 213 int idx = 0; 214 int i; 215 u8 *buf = raw->msg; 216 buf[idx++] = req->req_type & 0x7f; 217 218 switch (req->req_type) { 219 case DP_ENUM_PATH_RESOURCES: 220 buf[idx] = (req->u.port_num.port_number & 0xf) << 4; 221 idx++; 222 break; 223 case DP_ALLOCATE_PAYLOAD: 224 buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | 225 (req->u.allocate_payload.number_sdp_streams & 0xf); 226 idx++; 227 buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); 228 idx++; 229 buf[idx] = (req->u.allocate_payload.pbn >> 8); 230 idx++; 231 buf[idx] = (req->u.allocate_payload.pbn & 0xff); 232 idx++; 233 for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { 234 buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | 235 (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); 236 idx++; 237 } 238 if (req->u.allocate_payload.number_sdp_streams & 1) { 239 i = req->u.allocate_payload.number_sdp_streams - 1; 240 buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; 241 idx++; 242 } 243 break; 244 case DP_QUERY_PAYLOAD: 245 buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; 246 idx++; 247 buf[idx] = (req->u.query_payload.vcpi & 0x7f); 248 idx++; 249 break; 250 case DP_REMOTE_DPCD_READ: 251 buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; 252 buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; 253 idx++; 254 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; 255 idx++; 256 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); 257 idx++; 258 buf[idx] = (req->u.dpcd_read.num_bytes); 259 idx++; 260 break; 261 262 case DP_REMOTE_DPCD_WRITE: 263 buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; 264 buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; 265 idx++; 266 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; 267 idx++; 268 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); 269 idx++; 270 buf[idx] = (req->u.dpcd_write.num_bytes); 271 idx++; 272 memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); 273 idx += req->u.dpcd_write.num_bytes; 274 break; 275 case DP_REMOTE_I2C_READ: 276 buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; 277 buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); 278 idx++; 279 for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { 280 buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; 281 idx++; 282 buf[idx] = req->u.i2c_read.transactions[i].num_bytes; 283 idx++; 284 memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); 285 idx += req->u.i2c_read.transactions[i].num_bytes; 286 287 buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; 288 buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); 289 idx++; 290 } 291 buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; 292 idx++; 293 buf[idx] = (req->u.i2c_read.num_bytes_read); 294 idx++; 295 break; 296 297 case DP_REMOTE_I2C_WRITE: 298 buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; 299 idx++; 300 buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; 301 idx++; 302 buf[idx] = (req->u.i2c_write.num_bytes); 303 idx++; 304 memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); 305 idx += req->u.i2c_write.num_bytes; 306 break; 307 } 308 raw->cur_len = idx; 309 } 310 311 static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) 312 { 313 u8 crc4; 314 crc4 = drm_dp_msg_data_crc4(msg, len); 315 msg[len] = crc4; 316 } 317 318 static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, 319 struct drm_dp_sideband_msg_tx *raw) 320 { 321 int idx = 0; 322 u8 *buf = raw->msg; 323 324 buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); 325 326 raw->cur_len = idx; 327 } 328 329 /* this adds a chunk of msg to the builder to get the final msg */ 330 static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, 331 u8 *replybuf, u8 replybuflen, bool hdr) 332 { 333 int ret; 334 u8 crc4 __unused; /* XXX Mistake? */ 335 336 if (hdr) { 337 u8 hdrlen; 338 struct drm_dp_sideband_msg_hdr recv_hdr; 339 ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); 340 if (ret == false) { 341 print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); 342 return false; 343 } 344 345 /* 346 * ignore out-of-order messages or messages that are part of a 347 * failed transaction 348 */ 349 if (!recv_hdr.somt && !msg->have_somt) 350 return false; 351 352 /* get length contained in this portion */ 353 msg->curchunk_len = recv_hdr.msg_len; 354 msg->curchunk_hdrlen = hdrlen; 355 356 /* we have already gotten an somt - don't bother parsing */ 357 if (recv_hdr.somt && msg->have_somt) 358 return false; 359 360 if (recv_hdr.somt) { 361 memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); 362 msg->have_somt = true; 363 } 364 if (recv_hdr.eomt) 365 msg->have_eomt = true; 366 367 /* copy the bytes for the remainder of this header chunk */ 368 msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); 369 memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); 370 } else { 371 memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); 372 msg->curchunk_idx += replybuflen; 373 } 374 375 if (msg->curchunk_idx >= msg->curchunk_len) { 376 /* do CRC */ 377 crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); 378 /* copy chunk into bigger msg */ 379 memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); 380 msg->curlen += msg->curchunk_len - 1; 381 } 382 return true; 383 } 384 385 static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, 386 struct drm_dp_sideband_msg_reply_body *repmsg) 387 { 388 int idx = 1; 389 int i; 390 memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); 391 idx += 16; 392 repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; 393 idx++; 394 if (idx > raw->curlen) 395 goto fail_len; 396 for (i = 0; i < repmsg->u.link_addr.nports; i++) { 397 if (raw->msg[idx] & 0x80) 398 repmsg->u.link_addr.ports[i].input_port = 1; 399 400 repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; 401 repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); 402 403 idx++; 404 if (idx > raw->curlen) 405 goto fail_len; 406 repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; 407 repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; 408 if (repmsg->u.link_addr.ports[i].input_port == 0) 409 repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; 410 idx++; 411 if (idx > raw->curlen) 412 goto fail_len; 413 if (repmsg->u.link_addr.ports[i].input_port == 0) { 414 repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); 415 idx++; 416 if (idx > raw->curlen) 417 goto fail_len; 418 memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); 419 idx += 16; 420 if (idx > raw->curlen) 421 goto fail_len; 422 repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; 423 repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); 424 idx++; 425 426 } 427 if (idx > raw->curlen) 428 goto fail_len; 429 } 430 431 return true; 432 fail_len: 433 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); 434 return false; 435 } 436 437 static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, 438 struct drm_dp_sideband_msg_reply_body *repmsg) 439 { 440 int idx = 1; 441 repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; 442 idx++; 443 if (idx > raw->curlen) 444 goto fail_len; 445 repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; 446 if (idx > raw->curlen) 447 goto fail_len; 448 449 memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); 450 return true; 451 fail_len: 452 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); 453 return false; 454 } 455 456 static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, 457 struct drm_dp_sideband_msg_reply_body *repmsg) 458 { 459 int idx = 1; 460 repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; 461 idx++; 462 if (idx > raw->curlen) 463 goto fail_len; 464 return true; 465 fail_len: 466 DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); 467 return false; 468 } 469 470 static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, 471 struct drm_dp_sideband_msg_reply_body *repmsg) 472 { 473 int idx = 1; 474 475 repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); 476 idx++; 477 if (idx > raw->curlen) 478 goto fail_len; 479 repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; 480 idx++; 481 /* TODO check */ 482 memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); 483 return true; 484 fail_len: 485 DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); 486 return false; 487 } 488 489 static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, 490 struct drm_dp_sideband_msg_reply_body *repmsg) 491 { 492 int idx = 1; 493 repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; 494 idx++; 495 if (idx > raw->curlen) 496 goto fail_len; 497 repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); 498 idx += 2; 499 if (idx > raw->curlen) 500 goto fail_len; 501 repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); 502 idx += 2; 503 if (idx > raw->curlen) 504 goto fail_len; 505 return true; 506 fail_len: 507 DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); 508 return false; 509 } 510 511 static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, 512 struct drm_dp_sideband_msg_reply_body *repmsg) 513 { 514 int idx = 1; 515 repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; 516 idx++; 517 if (idx > raw->curlen) 518 goto fail_len; 519 repmsg->u.allocate_payload.vcpi = raw->msg[idx]; 520 idx++; 521 if (idx > raw->curlen) 522 goto fail_len; 523 repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); 524 idx += 2; 525 if (idx > raw->curlen) 526 goto fail_len; 527 return true; 528 fail_len: 529 DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); 530 return false; 531 } 532 533 static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, 534 struct drm_dp_sideband_msg_reply_body *repmsg) 535 { 536 int idx = 1; 537 repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; 538 idx++; 539 if (idx > raw->curlen) 540 goto fail_len; 541 repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); 542 idx += 2; 543 if (idx > raw->curlen) 544 goto fail_len; 545 return true; 546 fail_len: 547 DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); 548 return false; 549 } 550 551 static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, 552 struct drm_dp_sideband_msg_reply_body *msg) 553 { 554 memset(msg, 0, sizeof(*msg)); 555 msg->reply_type = (raw->msg[0] & 0x80) >> 7; 556 msg->req_type = (raw->msg[0] & 0x7f); 557 558 if (msg->reply_type) { 559 memcpy(msg->u.nak.guid, &raw->msg[1], 16); 560 msg->u.nak.reason = raw->msg[17]; 561 msg->u.nak.nak_data = raw->msg[18]; 562 return false; 563 } 564 565 switch (msg->req_type) { 566 case DP_LINK_ADDRESS: 567 return drm_dp_sideband_parse_link_address(raw, msg); 568 case DP_QUERY_PAYLOAD: 569 return drm_dp_sideband_parse_query_payload_ack(raw, msg); 570 case DP_REMOTE_DPCD_READ: 571 return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); 572 case DP_REMOTE_DPCD_WRITE: 573 return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); 574 case DP_REMOTE_I2C_READ: 575 return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); 576 case DP_ENUM_PATH_RESOURCES: 577 return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); 578 case DP_ALLOCATE_PAYLOAD: 579 return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); 580 default: 581 DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); 582 return false; 583 } 584 } 585 586 static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, 587 struct drm_dp_sideband_msg_req_body *msg) 588 { 589 int idx = 1; 590 591 msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; 592 idx++; 593 if (idx > raw->curlen) 594 goto fail_len; 595 596 memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); 597 idx += 16; 598 if (idx > raw->curlen) 599 goto fail_len; 600 601 msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; 602 msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; 603 msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; 604 msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; 605 msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); 606 idx++; 607 return true; 608 fail_len: 609 DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); 610 return false; 611 } 612 613 static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, 614 struct drm_dp_sideband_msg_req_body *msg) 615 { 616 int idx = 1; 617 618 msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; 619 idx++; 620 if (idx > raw->curlen) 621 goto fail_len; 622 623 memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); 624 idx += 16; 625 if (idx > raw->curlen) 626 goto fail_len; 627 628 msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); 629 idx++; 630 return true; 631 fail_len: 632 DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); 633 return false; 634 } 635 636 static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, 637 struct drm_dp_sideband_msg_req_body *msg) 638 { 639 memset(msg, 0, sizeof(*msg)); 640 msg->req_type = (raw->msg[0] & 0x7f); 641 642 switch (msg->req_type) { 643 case DP_CONNECTION_STATUS_NOTIFY: 644 return drm_dp_sideband_parse_connection_status_notify(raw, msg); 645 case DP_RESOURCE_STATUS_NOTIFY: 646 return drm_dp_sideband_parse_resource_status_notify(raw, msg); 647 default: 648 DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); 649 return false; 650 } 651 } 652 653 static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) 654 { 655 struct drm_dp_sideband_msg_req_body req; 656 657 req.req_type = DP_REMOTE_DPCD_WRITE; 658 req.u.dpcd_write.port_number = port_num; 659 req.u.dpcd_write.dpcd_address = offset; 660 req.u.dpcd_write.num_bytes = num_bytes; 661 req.u.dpcd_write.bytes = bytes; 662 drm_dp_encode_sideband_req(&req, msg); 663 664 return 0; 665 } 666 667 static int build_link_address(struct drm_dp_sideband_msg_tx *msg) 668 { 669 struct drm_dp_sideband_msg_req_body req; 670 671 req.req_type = DP_LINK_ADDRESS; 672 drm_dp_encode_sideband_req(&req, msg); 673 return 0; 674 } 675 676 static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) 677 { 678 struct drm_dp_sideband_msg_req_body req; 679 680 req.req_type = DP_ENUM_PATH_RESOURCES; 681 req.u.port_num.port_number = port_num; 682 drm_dp_encode_sideband_req(&req, msg); 683 msg->path_msg = true; 684 return 0; 685 } 686 687 static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, 688 u8 vcpi, uint16_t pbn) 689 { 690 struct drm_dp_sideband_msg_req_body req; 691 memset(&req, 0, sizeof(req)); 692 req.req_type = DP_ALLOCATE_PAYLOAD; 693 req.u.allocate_payload.port_number = port_num; 694 req.u.allocate_payload.vcpi = vcpi; 695 req.u.allocate_payload.pbn = pbn; 696 drm_dp_encode_sideband_req(&req, msg); 697 msg->path_msg = true; 698 return 0; 699 } 700 701 static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, 702 struct drm_dp_vcpi *vcpi) 703 { 704 int ret, vcpi_ret; 705 706 mutex_lock(&mgr->payload_lock); 707 ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); 708 if (ret > mgr->max_payloads) { 709 ret = -EINVAL; 710 DRM_DEBUG_KMS("out of payload ids %d\n", ret); 711 goto out_unlock; 712 } 713 714 vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); 715 if (vcpi_ret > mgr->max_payloads) { 716 ret = -EINVAL; 717 DRM_DEBUG_KMS("out of vcpi ids %d\n", ret); 718 goto out_unlock; 719 } 720 721 set_bit(ret, &mgr->payload_mask); 722 set_bit(vcpi_ret, &mgr->vcpi_mask); 723 vcpi->vcpi = vcpi_ret + 1; 724 mgr->proposed_vcpis[ret - 1] = vcpi; 725 out_unlock: 726 mutex_unlock(&mgr->payload_lock); 727 return ret; 728 } 729 730 static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, 731 int vcpi) 732 { 733 int i; 734 if (vcpi == 0) 735 return; 736 737 mutex_lock(&mgr->payload_lock); 738 DRM_DEBUG_KMS("putting payload %d\n", vcpi); 739 clear_bit(vcpi - 1, &mgr->vcpi_mask); 740 741 for (i = 0; i < mgr->max_payloads; i++) { 742 if (mgr->proposed_vcpis[i]) 743 if (mgr->proposed_vcpis[i]->vcpi == vcpi) { 744 mgr->proposed_vcpis[i] = NULL; 745 clear_bit(i + 1, &mgr->payload_mask); 746 } 747 } 748 mutex_unlock(&mgr->payload_lock); 749 } 750 751 static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, 752 struct drm_dp_sideband_msg_tx *txmsg) 753 { 754 bool ret; 755 756 /* 757 * All updates to txmsg->state are protected by mgr->qlock, and the two 758 * cases we check here are terminal states. For those the barriers 759 * provided by the wake_up/wait_event pair are enough. 760 */ 761 ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX || 762 txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT); 763 return ret; 764 } 765 766 static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, 767 struct drm_dp_sideband_msg_tx *txmsg) 768 { 769 struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; 770 int ret; 771 772 #ifdef __NetBSD__ 773 mutex_lock(&mstb->mgr->qlock); 774 DRM_TIMED_WAIT_UNTIL(ret, &mgr->tx_waitq, &mstb->mgr->qlock, 4*HZ, 775 check_txmsg_state(mgr, txmsg)); 776 #else 777 ret = wait_event_timeout(mgr->tx_waitq, 778 check_txmsg_state(mgr, txmsg), 779 (4 * HZ)); 780 mutex_lock(&mstb->mgr->qlock); 781 #endif 782 if (ret > 0) { 783 if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { 784 ret = -EIO; 785 goto out; 786 } 787 } else { 788 DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); 789 790 /* dump some state */ 791 ret = -EIO; 792 793 /* remove from q */ 794 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || 795 txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { 796 list_del(&txmsg->next); 797 } 798 799 if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || 800 txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { 801 mstb->tx_slots[txmsg->seqno] = NULL; 802 } 803 } 804 out: 805 mutex_unlock(&mgr->qlock); 806 807 return ret; 808 } 809 810 static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) 811 { 812 struct drm_dp_mst_branch *mstb; 813 814 mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); 815 if (!mstb) 816 return NULL; 817 818 mstb->lct = lct; 819 if (lct > 1) 820 memcpy(mstb->rad, rad, lct / 2); 821 INIT_LIST_HEAD(&mstb->ports); 822 kref_init(&mstb->kref); 823 return mstb; 824 } 825 826 static void drm_dp_free_mst_port(struct kref *kref); 827 828 static void drm_dp_free_mst_branch_device(struct kref *kref) 829 { 830 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); 831 if (mstb->port_parent) { 832 if (list_empty(&mstb->port_parent->next)) 833 kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port); 834 } 835 kfree(mstb); 836 } 837 838 static void drm_dp_destroy_mst_branch_device(struct kref *kref) 839 { 840 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); 841 struct drm_dp_mst_port *port, *tmp; 842 bool wake_tx = false; 843 844 /* 845 * init kref again to be used by ports to remove mst branch when it is 846 * not needed anymore 847 */ 848 kref_init(kref); 849 850 if (mstb->port_parent && list_empty(&mstb->port_parent->next)) 851 kref_get(&mstb->port_parent->kref); 852 853 /* 854 * destroy all ports - don't need lock 855 * as there are no more references to the mst branch 856 * device at this point. 857 */ 858 list_for_each_entry_safe(port, tmp, &mstb->ports, next) { 859 list_del(&port->next); 860 drm_dp_put_port(port); 861 } 862 863 /* drop any tx slots msg */ 864 mutex_lock(&mstb->mgr->qlock); 865 if (mstb->tx_slots[0]) { 866 mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; 867 mstb->tx_slots[0] = NULL; 868 wake_tx = true; 869 } 870 if (mstb->tx_slots[1]) { 871 mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; 872 mstb->tx_slots[1] = NULL; 873 wake_tx = true; 874 } 875 #ifdef __NetBSD__ 876 if (wake_tx) 877 DRM_WAKEUP_ONE(&mstb->mgr->tx_waitq, &mstb->mgr->qlock); 878 mutex_unlock(&mstb->mgr->qlock); 879 #else 880 mutex_unlock(&mstb->mgr->qlock); 881 882 if (wake_tx) 883 wake_up(&mstb->mgr->tx_waitq); 884 #endif 885 886 kref_put(kref, drm_dp_free_mst_branch_device); 887 } 888 889 static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) 890 { 891 kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); 892 } 893 894 895 static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) 896 { 897 struct drm_dp_mst_branch *mstb; 898 899 switch (old_pdt) { 900 case DP_PEER_DEVICE_DP_LEGACY_CONV: 901 case DP_PEER_DEVICE_SST_SINK: 902 /* remove i2c over sideband */ 903 drm_dp_mst_unregister_i2c_bus(&port->aux); 904 break; 905 case DP_PEER_DEVICE_MST_BRANCHING: 906 mstb = port->mstb; 907 port->mstb = NULL; 908 drm_dp_put_mst_branch_device(mstb); 909 break; 910 } 911 } 912 913 static void drm_dp_destroy_port(struct kref *kref) 914 { 915 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); 916 struct drm_dp_mst_topology_mgr *mgr = port->mgr; 917 918 if (!port->input) { 919 port->vcpi.num_slots = 0; 920 921 kfree(port->cached_edid); 922 923 /* 924 * The only time we don't have a connector 925 * on an output port is if the connector init 926 * fails. 927 */ 928 if (port->connector) { 929 /* we can't destroy the connector here, as 930 * we might be holding the mode_config.mutex 931 * from an EDID retrieval */ 932 933 mutex_lock(&mgr->destroy_connector_lock); 934 kref_get(&port->parent->kref); 935 list_add(&port->next, &mgr->destroy_connector_list); 936 mutex_unlock(&mgr->destroy_connector_lock); 937 schedule_work(&mgr->destroy_connector_work); 938 return; 939 } 940 /* no need to clean up vcpi 941 * as if we have no connector we never setup a vcpi */ 942 drm_dp_port_teardown_pdt(port, port->pdt); 943 port->pdt = DP_PEER_DEVICE_NONE; 944 } 945 kfree(port); 946 } 947 948 static void drm_dp_put_port(struct drm_dp_mst_port *port) 949 { 950 kref_put(&port->kref, drm_dp_destroy_port); 951 } 952 953 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) 954 { 955 struct drm_dp_mst_port *port; 956 struct drm_dp_mst_branch *rmstb; 957 if (to_find == mstb) { 958 kref_get(&mstb->kref); 959 return mstb; 960 } 961 list_for_each_entry(port, &mstb->ports, next) { 962 if (port->mstb) { 963 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); 964 if (rmstb) 965 return rmstb; 966 } 967 } 968 return NULL; 969 } 970 971 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) 972 { 973 struct drm_dp_mst_branch *rmstb = NULL; 974 mutex_lock(&mgr->lock); 975 if (mgr->mst_primary) 976 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb); 977 mutex_unlock(&mgr->lock); 978 return rmstb; 979 } 980 981 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) 982 { 983 struct drm_dp_mst_port *port, *mport; 984 985 list_for_each_entry(port, &mstb->ports, next) { 986 if (port == to_find) { 987 kref_get(&port->kref); 988 return port; 989 } 990 if (port->mstb) { 991 mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); 992 if (mport) 993 return mport; 994 } 995 } 996 return NULL; 997 } 998 999 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) 1000 { 1001 struct drm_dp_mst_port *rport = NULL; 1002 mutex_lock(&mgr->lock); 1003 if (mgr->mst_primary) 1004 rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); 1005 mutex_unlock(&mgr->lock); 1006 return rport; 1007 } 1008 1009 static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) 1010 { 1011 struct drm_dp_mst_port *port; 1012 1013 list_for_each_entry(port, &mstb->ports, next) { 1014 if (port->port_num == port_num) { 1015 kref_get(&port->kref); 1016 return port; 1017 } 1018 } 1019 1020 return NULL; 1021 } 1022 1023 /* 1024 * calculate a new RAD for this MST branch device 1025 * if parent has an LCT of 2 then it has 1 nibble of RAD, 1026 * if parent has an LCT of 3 then it has 2 nibbles of RAD, 1027 */ 1028 static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, 1029 u8 *rad) 1030 { 1031 int parent_lct = port->parent->lct; 1032 int shift = 4; 1033 int idx = (parent_lct - 1) / 2; 1034 if (parent_lct > 1) { 1035 memcpy(rad, port->parent->rad, idx + 1); 1036 shift = (parent_lct % 2) ? 4 : 0; 1037 } else 1038 rad[0] = 0; 1039 1040 rad[idx] |= port->port_num << shift; 1041 return parent_lct + 1; 1042 } 1043 1044 /* 1045 * return sends link address for new mstb 1046 */ 1047 static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) 1048 { 1049 int ret __unused; 1050 u8 rad[6], lct; 1051 bool send_link = false; 1052 switch (port->pdt) { 1053 case DP_PEER_DEVICE_DP_LEGACY_CONV: 1054 case DP_PEER_DEVICE_SST_SINK: 1055 /* add i2c over sideband */ 1056 ret = drm_dp_mst_register_i2c_bus(&port->aux); 1057 break; 1058 case DP_PEER_DEVICE_MST_BRANCHING: 1059 lct = drm_dp_calculate_rad(port, rad); 1060 1061 port->mstb = drm_dp_add_mst_branch_device(lct, rad); 1062 port->mstb->mgr = port->mgr; 1063 port->mstb->port_parent = port; 1064 1065 send_link = true; 1066 break; 1067 } 1068 return send_link; 1069 } 1070 1071 static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) 1072 { 1073 int ret __unused; 1074 1075 memcpy(mstb->guid, guid, 16); 1076 1077 if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { 1078 if (mstb->port_parent) { 1079 ret = drm_dp_send_dpcd_write( 1080 mstb->mgr, 1081 mstb->port_parent, 1082 DP_GUID, 1083 16, 1084 mstb->guid); 1085 } else { 1086 1087 ret = drm_dp_dpcd_write( 1088 mstb->mgr->aux, 1089 DP_GUID, 1090 mstb->guid, 1091 16); 1092 } 1093 } 1094 } 1095 1096 static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, 1097 int pnum, 1098 char *proppath, 1099 size_t proppath_size) 1100 { 1101 int i; 1102 char temp[8]; 1103 snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); 1104 for (i = 0; i < (mstb->lct - 1); i++) { 1105 int shift = (i % 2) ? 0 : 4; 1106 int port_num = (mstb->rad[i / 2] >> shift) & 0xf; 1107 snprintf(temp, sizeof(temp), "-%d", port_num); 1108 strlcat(proppath, temp, proppath_size); 1109 } 1110 snprintf(temp, sizeof(temp), "-%d", pnum); 1111 strlcat(proppath, temp, proppath_size); 1112 } 1113 1114 static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, 1115 struct device *dev, 1116 struct drm_dp_link_addr_reply_port *port_msg) 1117 { 1118 struct drm_dp_mst_port *port; 1119 bool ret; 1120 bool created = false; 1121 int old_pdt = 0; 1122 int old_ddps = 0; 1123 port = drm_dp_get_port(mstb, port_msg->port_number); 1124 if (!port) { 1125 port = kzalloc(sizeof(*port), GFP_KERNEL); 1126 if (!port) 1127 return; 1128 kref_init(&port->kref); 1129 port->parent = mstb; 1130 port->port_num = port_msg->port_number; 1131 port->mgr = mstb->mgr; 1132 port->aux.name = "DPMST"; 1133 port->aux.dev = dev; 1134 created = true; 1135 } else { 1136 old_pdt = port->pdt; 1137 old_ddps = port->ddps; 1138 } 1139 1140 port->pdt = port_msg->peer_device_type; 1141 port->input = port_msg->input_port; 1142 port->mcs = port_msg->mcs; 1143 port->ddps = port_msg->ddps; 1144 port->ldps = port_msg->legacy_device_plug_status; 1145 port->dpcd_rev = port_msg->dpcd_revision; 1146 port->num_sdp_streams = port_msg->num_sdp_streams; 1147 port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; 1148 1149 /* manage mstb port lists with mgr lock - take a reference 1150 for this list */ 1151 if (created) { 1152 mutex_lock(&mstb->mgr->lock); 1153 kref_get(&port->kref); 1154 list_add(&port->next, &mstb->ports); 1155 mutex_unlock(&mstb->mgr->lock); 1156 } 1157 1158 if (old_ddps != port->ddps) { 1159 if (port->ddps) { 1160 if (!port->input) 1161 drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); 1162 } else { 1163 port->available_pbn = 0; 1164 } 1165 } 1166 1167 if (old_pdt != port->pdt && !port->input) { 1168 drm_dp_port_teardown_pdt(port, old_pdt); 1169 1170 ret = drm_dp_port_setup_pdt(port); 1171 if (ret == true) 1172 drm_dp_send_link_address(mstb->mgr, port->mstb); 1173 } 1174 1175 if (created && !port->input) { 1176 char proppath[255]; 1177 1178 build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath)); 1179 port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath); 1180 if (!port->connector) { 1181 /* remove it from the port list */ 1182 mutex_lock(&mstb->mgr->lock); 1183 list_del(&port->next); 1184 mutex_unlock(&mstb->mgr->lock); 1185 /* drop port list reference */ 1186 drm_dp_put_port(port); 1187 goto out; 1188 } 1189 if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV || 1190 port->pdt == DP_PEER_DEVICE_SST_SINK) && 1191 port->port_num >= DP_MST_LOGICAL_PORT_0) { 1192 port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc); 1193 drm_mode_connector_set_tile_property(port->connector); 1194 } 1195 (*mstb->mgr->cbs->register_connector)(port->connector); 1196 } 1197 1198 out: 1199 /* put reference to this port */ 1200 drm_dp_put_port(port); 1201 } 1202 1203 static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, 1204 struct drm_dp_connection_status_notify *conn_stat) 1205 { 1206 struct drm_dp_mst_port *port; 1207 int old_pdt; 1208 int old_ddps; 1209 bool dowork = false; 1210 port = drm_dp_get_port(mstb, conn_stat->port_number); 1211 if (!port) 1212 return; 1213 1214 old_ddps = port->ddps; 1215 old_pdt = port->pdt; 1216 port->pdt = conn_stat->peer_device_type; 1217 port->mcs = conn_stat->message_capability_status; 1218 port->ldps = conn_stat->legacy_device_plug_status; 1219 port->ddps = conn_stat->displayport_device_plug_status; 1220 1221 if (old_ddps != port->ddps) { 1222 if (port->ddps) { 1223 dowork = true; 1224 } else { 1225 port->available_pbn = 0; 1226 } 1227 } 1228 if (old_pdt != port->pdt && !port->input) { 1229 drm_dp_port_teardown_pdt(port, old_pdt); 1230 1231 if (drm_dp_port_setup_pdt(port)) 1232 dowork = true; 1233 } 1234 1235 drm_dp_put_port(port); 1236 if (dowork) 1237 queue_work(system_long_wq, &mstb->mgr->work); 1238 1239 } 1240 1241 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, 1242 u8 lct, u8 *rad) 1243 { 1244 struct drm_dp_mst_branch *mstb; 1245 struct drm_dp_mst_port *port; 1246 int i; 1247 /* find the port by iterating down */ 1248 1249 mutex_lock(&mgr->lock); 1250 mstb = mgr->mst_primary; 1251 1252 for (i = 0; i < lct - 1; i++) { 1253 int shift = (i % 2) ? 0 : 4; 1254 int port_num = (rad[i / 2] >> shift) & 0xf; 1255 1256 list_for_each_entry(port, &mstb->ports, next) { 1257 if (port->port_num == port_num) { 1258 mstb = port->mstb; 1259 if (!mstb) { 1260 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); 1261 goto out; 1262 } 1263 1264 break; 1265 } 1266 } 1267 } 1268 kref_get(&mstb->kref); 1269 out: 1270 mutex_unlock(&mgr->lock); 1271 return mstb; 1272 } 1273 1274 static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( 1275 struct drm_dp_mst_branch *mstb, 1276 uint8_t *guid) 1277 { 1278 struct drm_dp_mst_branch *found_mstb; 1279 struct drm_dp_mst_port *port; 1280 1281 if (memcmp(mstb->guid, guid, 16) == 0) 1282 return mstb; 1283 1284 1285 list_for_each_entry(port, &mstb->ports, next) { 1286 if (!port->mstb) 1287 continue; 1288 1289 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); 1290 1291 if (found_mstb) 1292 return found_mstb; 1293 } 1294 1295 return NULL; 1296 } 1297 1298 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid( 1299 struct drm_dp_mst_topology_mgr *mgr, 1300 uint8_t *guid) 1301 { 1302 struct drm_dp_mst_branch *mstb; 1303 1304 /* find the port by iterating down */ 1305 mutex_lock(&mgr->lock); 1306 1307 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); 1308 1309 if (mstb) 1310 kref_get(&mstb->kref); 1311 1312 mutex_unlock(&mgr->lock); 1313 return mstb; 1314 } 1315 1316 static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, 1317 struct drm_dp_mst_branch *mstb) 1318 { 1319 struct drm_dp_mst_port *port; 1320 struct drm_dp_mst_branch *mstb_child; 1321 if (!mstb->link_address_sent) 1322 drm_dp_send_link_address(mgr, mstb); 1323 1324 list_for_each_entry(port, &mstb->ports, next) { 1325 if (port->input) 1326 continue; 1327 1328 if (!port->ddps) 1329 continue; 1330 1331 if (!port->available_pbn) 1332 drm_dp_send_enum_path_resources(mgr, mstb, port); 1333 1334 if (port->mstb) { 1335 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb); 1336 if (mstb_child) { 1337 drm_dp_check_and_send_link_address(mgr, mstb_child); 1338 drm_dp_put_mst_branch_device(mstb_child); 1339 } 1340 } 1341 } 1342 } 1343 1344 static void drm_dp_mst_link_probe_work(struct work_struct *work) 1345 { 1346 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); 1347 struct drm_dp_mst_branch *mstb; 1348 1349 mutex_lock(&mgr->lock); 1350 mstb = mgr->mst_primary; 1351 if (mstb) { 1352 kref_get(&mstb->kref); 1353 } 1354 mutex_unlock(&mgr->lock); 1355 if (mstb) { 1356 drm_dp_check_and_send_link_address(mgr, mstb); 1357 drm_dp_put_mst_branch_device(mstb); 1358 } 1359 } 1360 1361 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, 1362 u8 *guid) 1363 { 1364 static u8 zero_guid[16]; 1365 1366 if (!memcmp(guid, zero_guid, 16)) { 1367 u64 salt = get_jiffies_64(); 1368 memcpy(&guid[0], &salt, sizeof(u64)); 1369 memcpy(&guid[8], &salt, sizeof(u64)); 1370 return false; 1371 } 1372 return true; 1373 } 1374 1375 #if 0 1376 static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) 1377 { 1378 struct drm_dp_sideband_msg_req_body req; 1379 1380 req.req_type = DP_REMOTE_DPCD_READ; 1381 req.u.dpcd_read.port_number = port_num; 1382 req.u.dpcd_read.dpcd_address = offset; 1383 req.u.dpcd_read.num_bytes = num_bytes; 1384 drm_dp_encode_sideband_req(&req, msg); 1385 1386 return 0; 1387 } 1388 #endif 1389 1390 static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, 1391 bool up, u8 *msg, int len) 1392 { 1393 int ret; 1394 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; 1395 int tosend, total, offset; 1396 int retries = 0; 1397 1398 retry: 1399 total = len; 1400 offset = 0; 1401 do { 1402 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); 1403 1404 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, 1405 &msg[offset], 1406 tosend); 1407 if (ret != tosend) { 1408 if (ret == -EIO && retries < 5) { 1409 retries++; 1410 goto retry; 1411 } 1412 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); 1413 1414 return -EIO; 1415 } 1416 offset += tosend; 1417 total -= tosend; 1418 } while (total > 0); 1419 return 0; 1420 } 1421 1422 static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, 1423 struct drm_dp_sideband_msg_tx *txmsg) 1424 { 1425 struct drm_dp_mst_branch *mstb = txmsg->dst; 1426 u8 req_type; 1427 1428 /* both msg slots are full */ 1429 if (txmsg->seqno == -1) { 1430 if (mstb->tx_slots[0] && mstb->tx_slots[1]) { 1431 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); 1432 return -EAGAIN; 1433 } 1434 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { 1435 txmsg->seqno = mstb->last_seqno; 1436 mstb->last_seqno ^= 1; 1437 } else if (mstb->tx_slots[0] == NULL) 1438 txmsg->seqno = 0; 1439 else 1440 txmsg->seqno = 1; 1441 mstb->tx_slots[txmsg->seqno] = txmsg; 1442 } 1443 1444 req_type = txmsg->msg[0] & 0x7f; 1445 if (req_type == DP_CONNECTION_STATUS_NOTIFY || 1446 req_type == DP_RESOURCE_STATUS_NOTIFY) 1447 hdr->broadcast = 1; 1448 else 1449 hdr->broadcast = 0; 1450 hdr->path_msg = txmsg->path_msg; 1451 hdr->lct = mstb->lct; 1452 hdr->lcr = mstb->lct - 1; 1453 if (mstb->lct > 1) 1454 memcpy(hdr->rad, mstb->rad, mstb->lct / 2); 1455 hdr->seqno = txmsg->seqno; 1456 return 0; 1457 } 1458 /* 1459 * process a single block of the next message in the sideband queue 1460 */ 1461 static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, 1462 struct drm_dp_sideband_msg_tx *txmsg, 1463 bool up) 1464 { 1465 u8 chunk[48]; 1466 struct drm_dp_sideband_msg_hdr hdr; 1467 int len, space, idx, tosend; 1468 int ret; 1469 1470 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); 1471 1472 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { 1473 txmsg->seqno = -1; 1474 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; 1475 } 1476 1477 /* make hdr from dst mst - for replies use seqno 1478 otherwise assign one */ 1479 ret = set_hdr_from_dst_qlock(&hdr, txmsg); 1480 if (ret < 0) 1481 return ret; 1482 1483 /* amount left to send in this message */ 1484 len = txmsg->cur_len - txmsg->cur_offset; 1485 1486 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ 1487 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); 1488 1489 tosend = min(len, space); 1490 if (len == txmsg->cur_len) 1491 hdr.somt = 1; 1492 if (space >= len) 1493 hdr.eomt = 1; 1494 1495 1496 hdr.msg_len = tosend + 1; 1497 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); 1498 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); 1499 /* add crc at end */ 1500 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); 1501 idx += tosend + 1; 1502 1503 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); 1504 if (ret) { 1505 DRM_DEBUG_KMS("sideband msg failed to send\n"); 1506 return ret; 1507 } 1508 1509 txmsg->cur_offset += tosend; 1510 if (txmsg->cur_offset == txmsg->cur_len) { 1511 txmsg->state = DRM_DP_SIDEBAND_TX_SENT; 1512 return 1; 1513 } 1514 return 0; 1515 } 1516 1517 static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) 1518 { 1519 struct drm_dp_sideband_msg_tx *txmsg; 1520 int ret; 1521 1522 WARN_ON(!mutex_is_locked(&mgr->qlock)); 1523 1524 /* construct a chunk from the first msg in the tx_msg queue */ 1525 if (list_empty(&mgr->tx_msg_downq)) { 1526 mgr->tx_down_in_progress = false; 1527 return; 1528 } 1529 mgr->tx_down_in_progress = true; 1530 1531 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); 1532 ret = process_single_tx_qlock(mgr, txmsg, false); 1533 if (ret == 1) { 1534 /* txmsg is sent it should be in the slots now */ 1535 list_del(&txmsg->next); 1536 } else if (ret) { 1537 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); 1538 list_del(&txmsg->next); 1539 if (txmsg->seqno != -1) 1540 txmsg->dst->tx_slots[txmsg->seqno] = NULL; 1541 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; 1542 #ifdef __NetBSD__ 1543 DRM_WAKEUP_ONE(&mgr->tx_waitq, &mgr->qlock); 1544 #else 1545 wake_up(&mgr->tx_waitq); 1546 #endif 1547 } 1548 if (list_empty(&mgr->tx_msg_downq)) { 1549 mgr->tx_down_in_progress = false; 1550 return; 1551 } 1552 } 1553 1554 /* called holding qlock */ 1555 static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, 1556 struct drm_dp_sideband_msg_tx *txmsg) 1557 { 1558 int ret; 1559 1560 /* construct a chunk from the first msg in the tx_msg queue */ 1561 ret = process_single_tx_qlock(mgr, txmsg, true); 1562 1563 if (ret != 1) 1564 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); 1565 1566 txmsg->dst->tx_slots[txmsg->seqno] = NULL; 1567 } 1568 1569 static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, 1570 struct drm_dp_sideband_msg_tx *txmsg) 1571 { 1572 mutex_lock(&mgr->qlock); 1573 list_add_tail(&txmsg->next, &mgr->tx_msg_downq); 1574 if (!mgr->tx_down_in_progress) 1575 process_single_down_tx_qlock(mgr); 1576 mutex_unlock(&mgr->qlock); 1577 } 1578 1579 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, 1580 struct drm_dp_mst_branch *mstb) 1581 { 1582 int len __unused; 1583 struct drm_dp_sideband_msg_tx *txmsg; 1584 int ret; 1585 1586 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1587 if (!txmsg) 1588 return; 1589 1590 txmsg->dst = mstb; 1591 len = build_link_address(txmsg); 1592 1593 mstb->link_address_sent = true; 1594 drm_dp_queue_down_tx(mgr, txmsg); 1595 1596 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1597 if (ret > 0) { 1598 int i; 1599 1600 if (txmsg->reply.reply_type == 1) 1601 DRM_DEBUG_KMS("link address nak received\n"); 1602 else { 1603 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); 1604 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { 1605 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, 1606 txmsg->reply.u.link_addr.ports[i].input_port, 1607 txmsg->reply.u.link_addr.ports[i].peer_device_type, 1608 txmsg->reply.u.link_addr.ports[i].port_number, 1609 txmsg->reply.u.link_addr.ports[i].dpcd_revision, 1610 txmsg->reply.u.link_addr.ports[i].mcs, 1611 txmsg->reply.u.link_addr.ports[i].ddps, 1612 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, 1613 txmsg->reply.u.link_addr.ports[i].num_sdp_streams, 1614 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); 1615 } 1616 1617 drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid); 1618 1619 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { 1620 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); 1621 } 1622 (*mgr->cbs->hotplug)(mgr); 1623 } 1624 } else { 1625 mstb->link_address_sent = false; 1626 DRM_DEBUG_KMS("link address failed %d\n", ret); 1627 } 1628 1629 kfree(txmsg); 1630 } 1631 1632 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, 1633 struct drm_dp_mst_branch *mstb, 1634 struct drm_dp_mst_port *port) 1635 { 1636 int len __unused; 1637 struct drm_dp_sideband_msg_tx *txmsg; 1638 int ret; 1639 1640 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1641 if (!txmsg) 1642 return -ENOMEM; 1643 1644 txmsg->dst = mstb; 1645 len = build_enum_path_resources(txmsg, port->port_num); 1646 1647 drm_dp_queue_down_tx(mgr, txmsg); 1648 1649 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1650 if (ret > 0) { 1651 if (txmsg->reply.reply_type == 1) 1652 DRM_DEBUG_KMS("enum path resources nak received\n"); 1653 else { 1654 if (port->port_num != txmsg->reply.u.path_resources.port_number) 1655 DRM_ERROR("got incorrect port in response\n"); 1656 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, 1657 txmsg->reply.u.path_resources.avail_payload_bw_number); 1658 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; 1659 } 1660 } 1661 1662 kfree(txmsg); 1663 return 0; 1664 } 1665 1666 static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) 1667 { 1668 if (!mstb->port_parent) 1669 return NULL; 1670 1671 if (mstb->port_parent->mstb != mstb) 1672 return mstb->port_parent; 1673 1674 return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); 1675 } 1676 1677 static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, 1678 struct drm_dp_mst_branch *mstb, 1679 int *port_num) 1680 { 1681 struct drm_dp_mst_branch *rmstb = NULL; 1682 struct drm_dp_mst_port *found_port; 1683 mutex_lock(&mgr->lock); 1684 if (mgr->mst_primary) { 1685 found_port = drm_dp_get_last_connected_port_to_mstb(mstb); 1686 1687 if (found_port) { 1688 rmstb = found_port->parent; 1689 kref_get(&rmstb->kref); 1690 *port_num = found_port->port_num; 1691 } 1692 } 1693 mutex_unlock(&mgr->lock); 1694 return rmstb; 1695 } 1696 1697 static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, 1698 struct drm_dp_mst_port *port, 1699 int id, 1700 int pbn) 1701 { 1702 struct drm_dp_sideband_msg_tx *txmsg; 1703 struct drm_dp_mst_branch *mstb; 1704 int len __unused, ret, port_num; 1705 1706 port = drm_dp_get_validated_port_ref(mgr, port); 1707 if (!port) 1708 return -EINVAL; 1709 1710 port_num = port->port_num; 1711 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); 1712 if (!mstb) { 1713 mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num); 1714 1715 if (!mstb) { 1716 drm_dp_put_port(port); 1717 return -EINVAL; 1718 } 1719 } 1720 1721 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1722 if (!txmsg) { 1723 ret = -ENOMEM; 1724 goto fail_put; 1725 } 1726 1727 txmsg->dst = mstb; 1728 len = build_allocate_payload(txmsg, port_num, 1729 id, 1730 pbn); 1731 1732 drm_dp_queue_down_tx(mgr, txmsg); 1733 1734 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1735 if (ret > 0) { 1736 if (txmsg->reply.reply_type == 1) { 1737 ret = -EINVAL; 1738 } else 1739 ret = 0; 1740 } 1741 kfree(txmsg); 1742 fail_put: 1743 drm_dp_put_mst_branch_device(mstb); 1744 drm_dp_put_port(port); 1745 return ret; 1746 } 1747 1748 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, 1749 int id, 1750 struct drm_dp_payload *payload) 1751 { 1752 int ret; 1753 1754 ret = drm_dp_dpcd_write_payload(mgr, id, payload); 1755 if (ret < 0) { 1756 payload->payload_state = 0; 1757 return ret; 1758 } 1759 payload->payload_state = DP_PAYLOAD_LOCAL; 1760 return 0; 1761 } 1762 1763 static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, 1764 struct drm_dp_mst_port *port, 1765 int id, 1766 struct drm_dp_payload *payload) 1767 { 1768 int ret; 1769 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); 1770 if (ret < 0) 1771 return ret; 1772 payload->payload_state = DP_PAYLOAD_REMOTE; 1773 return ret; 1774 } 1775 1776 static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, 1777 struct drm_dp_mst_port *port, 1778 int id, 1779 struct drm_dp_payload *payload) 1780 { 1781 DRM_DEBUG_KMS("\n"); 1782 /* its okay for these to fail */ 1783 if (port) { 1784 drm_dp_payload_send_msg(mgr, port, id, 0); 1785 } 1786 1787 drm_dp_dpcd_write_payload(mgr, id, payload); 1788 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; 1789 return 0; 1790 } 1791 1792 static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, 1793 int id, 1794 struct drm_dp_payload *payload) 1795 { 1796 payload->payload_state = 0; 1797 return 0; 1798 } 1799 1800 /** 1801 * drm_dp_update_payload_part1() - Execute payload update part 1 1802 * @mgr: manager to use. 1803 * 1804 * This iterates over all proposed virtual channels, and tries to 1805 * allocate space in the link for them. For 0->slots transitions, 1806 * this step just writes the VCPI to the MST device. For slots->0 1807 * transitions, this writes the updated VCPIs and removes the 1808 * remote VC payloads. 1809 * 1810 * after calling this the driver should generate ACT and payload 1811 * packets. 1812 */ 1813 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) 1814 { 1815 int i, j; 1816 int cur_slots = 1; 1817 struct drm_dp_payload req_payload; 1818 struct drm_dp_mst_port *port; 1819 1820 mutex_lock(&mgr->payload_lock); 1821 for (i = 0; i < mgr->max_payloads; i++) { 1822 /* solve the current payloads - compare to the hw ones 1823 - update the hw view */ 1824 req_payload.start_slot = cur_slots; 1825 if (mgr->proposed_vcpis[i]) { 1826 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); 1827 port = drm_dp_get_validated_port_ref(mgr, port); 1828 if (!port) { 1829 mutex_unlock(&mgr->payload_lock); 1830 return -EINVAL; 1831 } 1832 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; 1833 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi; 1834 } else { 1835 port = NULL; 1836 req_payload.num_slots = 0; 1837 } 1838 1839 if (mgr->payloads[i].start_slot != req_payload.start_slot) { 1840 mgr->payloads[i].start_slot = req_payload.start_slot; 1841 } 1842 /* work out what is required to happen with this payload */ 1843 if (mgr->payloads[i].num_slots != req_payload.num_slots) { 1844 1845 /* need to push an update for this payload */ 1846 if (req_payload.num_slots) { 1847 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload); 1848 mgr->payloads[i].num_slots = req_payload.num_slots; 1849 mgr->payloads[i].vcpi = req_payload.vcpi; 1850 } else if (mgr->payloads[i].num_slots) { 1851 mgr->payloads[i].num_slots = 0; 1852 drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]); 1853 req_payload.payload_state = mgr->payloads[i].payload_state; 1854 mgr->payloads[i].start_slot = 0; 1855 } 1856 mgr->payloads[i].payload_state = req_payload.payload_state; 1857 } 1858 cur_slots += req_payload.num_slots; 1859 1860 if (port) 1861 drm_dp_put_port(port); 1862 } 1863 1864 for (i = 0; i < mgr->max_payloads; i++) { 1865 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { 1866 DRM_DEBUG_KMS("removing payload %d\n", i); 1867 for (j = i; j < mgr->max_payloads - 1; j++) { 1868 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload)); 1869 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; 1870 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) { 1871 set_bit(j + 1, &mgr->payload_mask); 1872 } else { 1873 clear_bit(j + 1, &mgr->payload_mask); 1874 } 1875 } 1876 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload)); 1877 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; 1878 clear_bit(mgr->max_payloads, &mgr->payload_mask); 1879 1880 } 1881 } 1882 mutex_unlock(&mgr->payload_lock); 1883 1884 return 0; 1885 } 1886 EXPORT_SYMBOL(drm_dp_update_payload_part1); 1887 1888 /** 1889 * drm_dp_update_payload_part2() - Execute payload update part 2 1890 * @mgr: manager to use. 1891 * 1892 * This iterates over all proposed virtual channels, and tries to 1893 * allocate space in the link for them. For 0->slots transitions, 1894 * this step writes the remote VC payload commands. For slots->0 1895 * this just resets some internal state. 1896 */ 1897 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) 1898 { 1899 struct drm_dp_mst_port *port; 1900 int i; 1901 int ret = 0; 1902 mutex_lock(&mgr->payload_lock); 1903 for (i = 0; i < mgr->max_payloads; i++) { 1904 1905 if (!mgr->proposed_vcpis[i]) 1906 continue; 1907 1908 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); 1909 1910 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); 1911 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { 1912 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); 1913 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { 1914 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); 1915 } 1916 if (ret) { 1917 mutex_unlock(&mgr->payload_lock); 1918 return ret; 1919 } 1920 } 1921 mutex_unlock(&mgr->payload_lock); 1922 return 0; 1923 } 1924 EXPORT_SYMBOL(drm_dp_update_payload_part2); 1925 1926 #if 0 /* unused as of yet */ 1927 static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, 1928 struct drm_dp_mst_port *port, 1929 int offset, int size) 1930 { 1931 int len; 1932 struct drm_dp_sideband_msg_tx *txmsg; 1933 1934 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1935 if (!txmsg) 1936 return -ENOMEM; 1937 1938 len = build_dpcd_read(txmsg, port->port_num, 0, 8); 1939 txmsg->dst = port->parent; 1940 1941 drm_dp_queue_down_tx(mgr, txmsg); 1942 1943 return 0; 1944 } 1945 #endif 1946 1947 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, 1948 struct drm_dp_mst_port *port, 1949 int offset, int size, u8 *bytes) 1950 { 1951 int len __unused; 1952 int ret; 1953 struct drm_dp_sideband_msg_tx *txmsg; 1954 struct drm_dp_mst_branch *mstb; 1955 1956 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); 1957 if (!mstb) 1958 return -EINVAL; 1959 1960 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1961 if (!txmsg) { 1962 ret = -ENOMEM; 1963 goto fail_put; 1964 } 1965 1966 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); 1967 txmsg->dst = mstb; 1968 1969 drm_dp_queue_down_tx(mgr, txmsg); 1970 1971 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1972 if (ret > 0) { 1973 if (txmsg->reply.reply_type == 1) { 1974 ret = -EINVAL; 1975 } else 1976 ret = 0; 1977 } 1978 kfree(txmsg); 1979 fail_put: 1980 drm_dp_put_mst_branch_device(mstb); 1981 return ret; 1982 } 1983 1984 static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) 1985 { 1986 struct drm_dp_sideband_msg_reply_body reply; 1987 1988 reply.reply_type = 1; 1989 reply.req_type = req_type; 1990 drm_dp_encode_sideband_reply(&reply, msg); 1991 return 0; 1992 } 1993 1994 static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, 1995 struct drm_dp_mst_branch *mstb, 1996 int req_type, int seqno, bool broadcast) 1997 { 1998 struct drm_dp_sideband_msg_tx *txmsg; 1999 2000 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 2001 if (!txmsg) 2002 return -ENOMEM; 2003 2004 txmsg->dst = mstb; 2005 txmsg->seqno = seqno; 2006 drm_dp_encode_up_ack_reply(txmsg, req_type); 2007 2008 mutex_lock(&mgr->qlock); 2009 2010 process_single_up_tx_qlock(mgr, txmsg); 2011 2012 mutex_unlock(&mgr->qlock); 2013 2014 kfree(txmsg); 2015 return 0; 2016 } 2017 2018 static bool drm_dp_get_vc_payload_bw(int dp_link_bw, 2019 int dp_link_count, 2020 int *out) 2021 { 2022 switch (dp_link_bw) { 2023 default: 2024 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n", 2025 dp_link_bw, dp_link_count); 2026 return false; 2027 2028 case DP_LINK_BW_1_62: 2029 *out = 3 * dp_link_count; 2030 break; 2031 case DP_LINK_BW_2_7: 2032 *out = 5 * dp_link_count; 2033 break; 2034 case DP_LINK_BW_5_4: 2035 *out = 10 * dp_link_count; 2036 break; 2037 } 2038 return true; 2039 } 2040 2041 /** 2042 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager 2043 * @mgr: manager to set state for 2044 * @mst_state: true to enable MST on this connector - false to disable. 2045 * 2046 * This is called by the driver when it detects an MST capable device plugged 2047 * into a DP MST capable port, or when a DP MST capable device is unplugged. 2048 */ 2049 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) 2050 { 2051 int ret = 0; 2052 struct drm_dp_mst_branch *mstb = NULL; 2053 2054 mutex_lock(&mgr->lock); 2055 if (mst_state == mgr->mst_state) 2056 goto out_unlock; 2057 2058 mgr->mst_state = mst_state; 2059 /* set the device into MST mode */ 2060 if (mst_state) { 2061 WARN_ON(mgr->mst_primary); 2062 2063 /* get dpcd info */ 2064 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); 2065 if (ret != DP_RECEIVER_CAP_SIZE) { 2066 DRM_DEBUG_KMS("failed to read DPCD\n"); 2067 goto out_unlock; 2068 } 2069 2070 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1], 2071 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, 2072 &mgr->pbn_div)) { 2073 ret = -EINVAL; 2074 goto out_unlock; 2075 } 2076 2077 mgr->total_pbn = 2560; 2078 mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div); 2079 mgr->avail_slots = mgr->total_slots; 2080 2081 /* add initial branch device at LCT 1 */ 2082 mstb = drm_dp_add_mst_branch_device(1, NULL); 2083 if (mstb == NULL) { 2084 ret = -ENOMEM; 2085 goto out_unlock; 2086 } 2087 mstb->mgr = mgr; 2088 2089 /* give this the main reference */ 2090 mgr->mst_primary = mstb; 2091 kref_get(&mgr->mst_primary->kref); 2092 2093 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 2094 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); 2095 if (ret < 0) { 2096 goto out_unlock; 2097 } 2098 2099 { 2100 struct drm_dp_payload reset_pay; 2101 reset_pay.start_slot = 0; 2102 reset_pay.num_slots = 0x3f; 2103 drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); 2104 } 2105 2106 queue_work(system_long_wq, &mgr->work); 2107 2108 ret = 0; 2109 } else { 2110 /* disable MST on the device */ 2111 mstb = mgr->mst_primary; 2112 mgr->mst_primary = NULL; 2113 /* this can fail if the device is gone */ 2114 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); 2115 ret = 0; 2116 memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); 2117 mgr->payload_mask = 0; 2118 set_bit(0, &mgr->payload_mask); 2119 mgr->vcpi_mask = 0; 2120 } 2121 2122 out_unlock: 2123 mutex_unlock(&mgr->lock); 2124 if (mstb) 2125 drm_dp_put_mst_branch_device(mstb); 2126 return ret; 2127 2128 } 2129 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); 2130 2131 /** 2132 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager 2133 * @mgr: manager to suspend 2134 * 2135 * This function tells the MST device that we can't handle UP messages 2136 * anymore. This should stop it from sending any since we are suspended. 2137 */ 2138 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) 2139 { 2140 mutex_lock(&mgr->lock); 2141 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 2142 DP_MST_EN | DP_UPSTREAM_IS_SRC); 2143 mutex_unlock(&mgr->lock); 2144 flush_work(&mgr->work); 2145 flush_work(&mgr->destroy_connector_work); 2146 } 2147 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); 2148 2149 /** 2150 * drm_dp_mst_topology_mgr_resume() - resume the MST manager 2151 * @mgr: manager to resume 2152 * 2153 * This will fetch DPCD and see if the device is still there, 2154 * if it is, it will rewrite the MSTM control bits, and return. 2155 * 2156 * if the device fails this returns -1, and the driver should do 2157 * a full MST reprobe, in case we were undocked. 2158 */ 2159 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) 2160 { 2161 int ret = 0; 2162 2163 mutex_lock(&mgr->lock); 2164 2165 if (mgr->mst_primary) { 2166 int sret; 2167 u8 guid[16]; 2168 2169 sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); 2170 if (sret != DP_RECEIVER_CAP_SIZE) { 2171 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); 2172 ret = -1; 2173 goto out_unlock; 2174 } 2175 2176 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 2177 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); 2178 if (ret < 0) { 2179 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); 2180 ret = -1; 2181 goto out_unlock; 2182 } 2183 2184 /* Some hubs forget their guids after they resume */ 2185 sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); 2186 if (sret != 16) { 2187 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); 2188 ret = -1; 2189 goto out_unlock; 2190 } 2191 drm_dp_check_mstb_guid(mgr->mst_primary, guid); 2192 2193 ret = 0; 2194 } else 2195 ret = -1; 2196 2197 out_unlock: 2198 mutex_unlock(&mgr->lock); 2199 return ret; 2200 } 2201 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); 2202 2203 static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) 2204 { 2205 int len; 2206 u8 replyblock[32]; 2207 int replylen, origlen __unused, curreply; 2208 int ret; 2209 struct drm_dp_sideband_msg_rx *msg; 2210 int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; 2211 msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; 2212 2213 len = min(mgr->max_dpcd_transaction_bytes, 16); 2214 ret = drm_dp_dpcd_read(mgr->aux, basereg, 2215 replyblock, len); 2216 if (ret != len) { 2217 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); 2218 return false; 2219 } 2220 ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); 2221 if (!ret) { 2222 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); 2223 return false; 2224 } 2225 replylen = msg->curchunk_len + msg->curchunk_hdrlen; 2226 2227 origlen = replylen; 2228 replylen -= len; 2229 curreply = len; 2230 while (replylen > 0) { 2231 len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); 2232 ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, 2233 replyblock, len); 2234 if (ret != len) { 2235 DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n", 2236 len, ret); 2237 return false; 2238 } 2239 2240 ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); 2241 if (!ret) { 2242 DRM_DEBUG_KMS("failed to build sideband msg\n"); 2243 return false; 2244 } 2245 2246 curreply += len; 2247 replylen -= len; 2248 } 2249 return true; 2250 } 2251 2252 static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) 2253 { 2254 int ret = 0; 2255 2256 if (!drm_dp_get_one_sb_msg(mgr, false)) { 2257 memset(&mgr->down_rep_recv, 0, 2258 sizeof(struct drm_dp_sideband_msg_rx)); 2259 return 0; 2260 } 2261 2262 if (mgr->down_rep_recv.have_eomt) { 2263 struct drm_dp_sideband_msg_tx *txmsg; 2264 struct drm_dp_mst_branch *mstb; 2265 int slot = -1; 2266 mstb = drm_dp_get_mst_branch_device(mgr, 2267 mgr->down_rep_recv.initial_hdr.lct, 2268 mgr->down_rep_recv.initial_hdr.rad); 2269 2270 if (!mstb) { 2271 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); 2272 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2273 return 0; 2274 } 2275 2276 /* find the message */ 2277 slot = mgr->down_rep_recv.initial_hdr.seqno; 2278 mutex_lock(&mgr->qlock); 2279 txmsg = mstb->tx_slots[slot]; 2280 /* remove from slots */ 2281 mutex_unlock(&mgr->qlock); 2282 2283 if (!txmsg) { 2284 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", 2285 mstb, 2286 mgr->down_rep_recv.initial_hdr.seqno, 2287 mgr->down_rep_recv.initial_hdr.lct, 2288 mgr->down_rep_recv.initial_hdr.rad[0], 2289 mgr->down_rep_recv.msg[0]); 2290 drm_dp_put_mst_branch_device(mstb); 2291 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2292 return 0; 2293 } 2294 2295 drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); 2296 if (txmsg->reply.reply_type == 1) { 2297 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); 2298 } 2299 2300 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2301 drm_dp_put_mst_branch_device(mstb); 2302 2303 mutex_lock(&mgr->qlock); 2304 txmsg->state = DRM_DP_SIDEBAND_TX_RX; 2305 mstb->tx_slots[slot] = NULL; 2306 #ifdef __NetBSD__ 2307 DRM_WAKEUP_ONE(&mstb->mgr->tx_waitq, &mstb->mgr->qlock); 2308 mutex_unlock(&mgr->qlock); 2309 #else 2310 mutex_unlock(&mgr->qlock); 2311 2312 wake_up(&mgr->tx_waitq); 2313 #endif 2314 } 2315 return ret; 2316 } 2317 2318 static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) 2319 { 2320 int ret = 0; 2321 2322 if (!drm_dp_get_one_sb_msg(mgr, true)) { 2323 memset(&mgr->up_req_recv, 0, 2324 sizeof(struct drm_dp_sideband_msg_rx)); 2325 return 0; 2326 } 2327 2328 if (mgr->up_req_recv.have_eomt) { 2329 struct drm_dp_sideband_msg_req_body msg; 2330 struct drm_dp_mst_branch *mstb = NULL; 2331 bool seqno; 2332 2333 if (!mgr->up_req_recv.initial_hdr.broadcast) { 2334 mstb = drm_dp_get_mst_branch_device(mgr, 2335 mgr->up_req_recv.initial_hdr.lct, 2336 mgr->up_req_recv.initial_hdr.rad); 2337 if (!mstb) { 2338 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); 2339 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2340 return 0; 2341 } 2342 } 2343 2344 seqno = mgr->up_req_recv.initial_hdr.seqno; 2345 drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); 2346 2347 if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { 2348 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); 2349 2350 if (!mstb) 2351 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid); 2352 2353 if (!mstb) { 2354 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); 2355 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2356 return 0; 2357 } 2358 2359 drm_dp_update_port(mstb, &msg.u.conn_stat); 2360 2361 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); 2362 (*mgr->cbs->hotplug)(mgr); 2363 2364 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { 2365 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); 2366 if (!mstb) 2367 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid); 2368 2369 if (!mstb) { 2370 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); 2371 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2372 return 0; 2373 } 2374 2375 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); 2376 } 2377 2378 if (mstb) 2379 drm_dp_put_mst_branch_device(mstb); 2380 2381 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2382 } 2383 return ret; 2384 } 2385 2386 /** 2387 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify 2388 * @mgr: manager to notify irq for. 2389 * @esi: 4 bytes from SINK_COUNT_ESI 2390 * @handled: whether the hpd interrupt was consumed or not 2391 * 2392 * This should be called from the driver when it detects a short IRQ, 2393 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The 2394 * topology manager will process the sideband messages received as a result 2395 * of this. 2396 */ 2397 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) 2398 { 2399 int ret = 0; 2400 int sc; 2401 *handled = false; 2402 sc = esi[0] & 0x3f; 2403 2404 if (sc != mgr->sink_count) { 2405 mgr->sink_count = sc; 2406 *handled = true; 2407 } 2408 2409 if (esi[1] & DP_DOWN_REP_MSG_RDY) { 2410 ret = drm_dp_mst_handle_down_rep(mgr); 2411 *handled = true; 2412 } 2413 2414 if (esi[1] & DP_UP_REQ_MSG_RDY) { 2415 ret |= drm_dp_mst_handle_up_req(mgr); 2416 *handled = true; 2417 } 2418 2419 drm_dp_mst_kick_tx(mgr); 2420 return ret; 2421 } 2422 EXPORT_SYMBOL(drm_dp_mst_hpd_irq); 2423 2424 /** 2425 * drm_dp_mst_detect_port() - get connection status for an MST port 2426 * @mgr: manager for this port 2427 * @port: unverified pointer to a port 2428 * 2429 * This returns the current connection state for a port. It validates the 2430 * port pointer still exists so the caller doesn't require a reference 2431 */ 2432 enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, 2433 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2434 { 2435 enum drm_connector_status status = connector_status_disconnected; 2436 2437 /* we need to search for the port in the mgr in case its gone */ 2438 port = drm_dp_get_validated_port_ref(mgr, port); 2439 if (!port) 2440 return connector_status_disconnected; 2441 2442 if (!port->ddps) 2443 goto out; 2444 2445 switch (port->pdt) { 2446 case DP_PEER_DEVICE_NONE: 2447 case DP_PEER_DEVICE_MST_BRANCHING: 2448 break; 2449 2450 case DP_PEER_DEVICE_SST_SINK: 2451 status = connector_status_connected; 2452 /* for logical ports - cache the EDID */ 2453 if (port->port_num >= 8 && !port->cached_edid) { 2454 port->cached_edid = drm_get_edid(connector, &port->aux.ddc); 2455 } 2456 break; 2457 case DP_PEER_DEVICE_DP_LEGACY_CONV: 2458 if (port->ldps) 2459 status = connector_status_connected; 2460 break; 2461 } 2462 out: 2463 drm_dp_put_port(port); 2464 return status; 2465 } 2466 EXPORT_SYMBOL(drm_dp_mst_detect_port); 2467 2468 /** 2469 * drm_dp_mst_get_edid() - get EDID for an MST port 2470 * @connector: toplevel connector to get EDID for 2471 * @mgr: manager for this port 2472 * @port: unverified pointer to a port. 2473 * 2474 * This returns an EDID for the port connected to a connector, 2475 * It validates the pointer still exists so the caller doesn't require a 2476 * reference. 2477 */ 2478 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2479 { 2480 struct edid *edid = NULL; 2481 2482 /* we need to search for the port in the mgr in case its gone */ 2483 port = drm_dp_get_validated_port_ref(mgr, port); 2484 if (!port) 2485 return NULL; 2486 2487 if (port->cached_edid) 2488 edid = drm_edid_duplicate(port->cached_edid); 2489 else { 2490 edid = drm_get_edid(connector, &port->aux.ddc); 2491 drm_mode_connector_set_tile_property(connector); 2492 } 2493 drm_dp_put_port(port); 2494 return edid; 2495 } 2496 EXPORT_SYMBOL(drm_dp_mst_get_edid); 2497 2498 /** 2499 * drm_dp_find_vcpi_slots() - find slots for this PBN value 2500 * @mgr: manager to use 2501 * @pbn: payload bandwidth to convert into slots. 2502 */ 2503 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, 2504 int pbn) 2505 { 2506 int num_slots; 2507 2508 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); 2509 2510 if (num_slots > mgr->avail_slots) 2511 return -ENOSPC; 2512 return num_slots; 2513 } 2514 EXPORT_SYMBOL(drm_dp_find_vcpi_slots); 2515 2516 static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, 2517 struct drm_dp_vcpi *vcpi, int pbn) 2518 { 2519 int num_slots; 2520 int ret; 2521 2522 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); 2523 2524 if (num_slots > mgr->avail_slots) 2525 return -ENOSPC; 2526 2527 vcpi->pbn = pbn; 2528 vcpi->aligned_pbn = num_slots * mgr->pbn_div; 2529 vcpi->num_slots = num_slots; 2530 2531 ret = drm_dp_mst_assign_payload_id(mgr, vcpi); 2532 if (ret < 0) 2533 return ret; 2534 return 0; 2535 } 2536 2537 /** 2538 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel 2539 * @mgr: manager for this port 2540 * @port: port to allocate a virtual channel for. 2541 * @pbn: payload bandwidth number to request 2542 * @slots: returned number of slots for this PBN. 2543 */ 2544 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots) 2545 { 2546 int ret; 2547 2548 port = drm_dp_get_validated_port_ref(mgr, port); 2549 if (!port) 2550 return false; 2551 2552 if (port->vcpi.vcpi > 0) { 2553 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); 2554 if (pbn == port->vcpi.pbn) { 2555 *slots = port->vcpi.num_slots; 2556 drm_dp_put_port(port); 2557 return true; 2558 } 2559 } 2560 2561 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn); 2562 if (ret) { 2563 DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret); 2564 goto out; 2565 } 2566 DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); 2567 *slots = port->vcpi.num_slots; 2568 2569 drm_dp_put_port(port); 2570 return true; 2571 out: 2572 return false; 2573 } 2574 EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); 2575 2576 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2577 { 2578 int slots = 0; 2579 port = drm_dp_get_validated_port_ref(mgr, port); 2580 if (!port) 2581 return slots; 2582 2583 slots = port->vcpi.num_slots; 2584 drm_dp_put_port(port); 2585 return slots; 2586 } 2587 EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots); 2588 2589 /** 2590 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI 2591 * @mgr: manager for this port 2592 * @port: unverified pointer to a port. 2593 * 2594 * This just resets the number of slots for the ports VCPI for later programming. 2595 */ 2596 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2597 { 2598 port = drm_dp_get_validated_port_ref(mgr, port); 2599 if (!port) 2600 return; 2601 port->vcpi.num_slots = 0; 2602 drm_dp_put_port(port); 2603 } 2604 EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); 2605 2606 /** 2607 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI 2608 * @mgr: manager for this port 2609 * @port: unverified port to deallocate vcpi for 2610 */ 2611 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2612 { 2613 port = drm_dp_get_validated_port_ref(mgr, port); 2614 if (!port) 2615 return; 2616 2617 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); 2618 port->vcpi.num_slots = 0; 2619 port->vcpi.pbn = 0; 2620 port->vcpi.aligned_pbn = 0; 2621 port->vcpi.vcpi = 0; 2622 drm_dp_put_port(port); 2623 } 2624 EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); 2625 2626 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, 2627 int id, struct drm_dp_payload *payload) 2628 { 2629 u8 payload_alloc[3], status; 2630 int ret; 2631 int retries = 0; 2632 2633 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, 2634 DP_PAYLOAD_TABLE_UPDATED); 2635 2636 payload_alloc[0] = id; 2637 payload_alloc[1] = payload->start_slot; 2638 payload_alloc[2] = payload->num_slots; 2639 2640 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); 2641 if (ret != 3) { 2642 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); 2643 goto fail; 2644 } 2645 2646 retry: 2647 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); 2648 if (ret < 0) { 2649 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); 2650 goto fail; 2651 } 2652 2653 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { 2654 retries++; 2655 if (retries < 20) { 2656 usleep_range(10000, 20000); 2657 goto retry; 2658 } 2659 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); 2660 ret = -EINVAL; 2661 goto fail; 2662 } 2663 ret = 0; 2664 fail: 2665 return ret; 2666 } 2667 2668 2669 /** 2670 * drm_dp_check_act_status() - Check ACT handled status. 2671 * @mgr: manager to use 2672 * 2673 * Check the payload status bits in the DPCD for ACT handled completion. 2674 */ 2675 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) 2676 { 2677 u8 status; 2678 int ret; 2679 int count = 0; 2680 2681 do { 2682 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); 2683 2684 if (ret < 0) { 2685 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); 2686 goto fail; 2687 } 2688 2689 if (status & DP_PAYLOAD_ACT_HANDLED) 2690 break; 2691 count++; 2692 udelay(100); 2693 2694 } while (count < 30); 2695 2696 if (!(status & DP_PAYLOAD_ACT_HANDLED)) { 2697 DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); 2698 ret = -EINVAL; 2699 goto fail; 2700 } 2701 return 0; 2702 fail: 2703 return ret; 2704 } 2705 EXPORT_SYMBOL(drm_dp_check_act_status); 2706 2707 /** 2708 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. 2709 * @clock: dot clock for the mode 2710 * @bpp: bpp for the mode. 2711 * 2712 * This uses the formula in the spec to calculate the PBN value for a mode. 2713 */ 2714 int drm_dp_calc_pbn_mode(int clock, int bpp) 2715 { 2716 u64 kbps; 2717 s64 peak_kbps; 2718 u32 numerator; 2719 u32 denominator; 2720 2721 kbps = clock * bpp; 2722 2723 /* 2724 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006 2725 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on 2726 * common multiplier to render an integer PBN for all link rate/lane 2727 * counts combinations 2728 * calculate 2729 * peak_kbps *= (1006/1000) 2730 * peak_kbps *= (64/54) 2731 * peak_kbps *= 8 convert to bytes 2732 */ 2733 2734 numerator = 64 * 1006; 2735 denominator = 54 * 8 * 1000 * 1000; 2736 2737 kbps *= numerator; 2738 peak_kbps = drm_fixp_from_fraction(kbps, denominator); 2739 2740 return drm_fixp2int_ceil(peak_kbps); 2741 } 2742 EXPORT_SYMBOL(drm_dp_calc_pbn_mode); 2743 2744 static int test_calc_pbn_mode(void) 2745 { 2746 int ret; 2747 ret = drm_dp_calc_pbn_mode(154000, 30); 2748 if (ret != 689) { 2749 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", 2750 154000, 30, 689, ret); 2751 return -EINVAL; 2752 } 2753 ret = drm_dp_calc_pbn_mode(234000, 30); 2754 if (ret != 1047) { 2755 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", 2756 234000, 30, 1047, ret); 2757 return -EINVAL; 2758 } 2759 ret = drm_dp_calc_pbn_mode(297000, 24); 2760 if (ret != 1063) { 2761 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", 2762 297000, 24, 1063, ret); 2763 return -EINVAL; 2764 } 2765 return 0; 2766 } 2767 2768 /* we want to kick the TX after we've ack the up/down IRQs. */ 2769 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) 2770 { 2771 queue_work(system_long_wq, &mgr->tx_work); 2772 } 2773 2774 #if IS_ENABLED(CONFIG_DEBUG_FS) 2775 static void drm_dp_mst_dump_mstb(struct seq_file *m, 2776 struct drm_dp_mst_branch *mstb) 2777 { 2778 struct drm_dp_mst_port *port; 2779 int tabs = mstb->lct; 2780 char prefix[10]; 2781 int i; 2782 2783 for (i = 0; i < tabs; i++) 2784 prefix[i] = '\t'; 2785 prefix[i] = '\0'; 2786 2787 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); 2788 list_for_each_entry(port, &mstb->ports, next) { 2789 seq_printf(m, "%sport: %d: ddps: %d ldps: %d, %p, conn: %p\n", prefix, port->port_num, port->ddps, port->ldps, port, port->connector); 2790 if (port->mstb) 2791 drm_dp_mst_dump_mstb(m, port->mstb); 2792 } 2793 } 2794 2795 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, 2796 char *buf) 2797 { 2798 int ret; 2799 int i; 2800 for (i = 0; i < 4; i++) { 2801 ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16); 2802 if (ret != 16) 2803 break; 2804 } 2805 if (i == 4) 2806 return true; 2807 return false; 2808 } 2809 2810 /** 2811 * drm_dp_mst_dump_topology(): dump topology to seq file. 2812 * @m: seq_file to dump output to 2813 * @mgr: manager to dump current topology for. 2814 * 2815 * helper to dump MST topology to a seq file for debugfs. 2816 */ 2817 void drm_dp_mst_dump_topology(struct seq_file *m, 2818 struct drm_dp_mst_topology_mgr *mgr) 2819 { 2820 int i; 2821 struct drm_dp_mst_port *port; 2822 mutex_lock(&mgr->lock); 2823 if (mgr->mst_primary) 2824 drm_dp_mst_dump_mstb(m, mgr->mst_primary); 2825 2826 /* dump VCPIs */ 2827 mutex_unlock(&mgr->lock); 2828 2829 mutex_lock(&mgr->payload_lock); 2830 seq_printf(m, "vcpi: %lx %lx\n", mgr->payload_mask, mgr->vcpi_mask); 2831 2832 for (i = 0; i < mgr->max_payloads; i++) { 2833 if (mgr->proposed_vcpis[i]) { 2834 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); 2835 seq_printf(m, "vcpi %d: %d %d %d\n", i, port->port_num, port->vcpi.vcpi, port->vcpi.num_slots); 2836 } else 2837 seq_printf(m, "vcpi %d:unsed\n", i); 2838 } 2839 for (i = 0; i < mgr->max_payloads; i++) { 2840 seq_printf(m, "payload %d: %d, %d, %d\n", 2841 i, 2842 mgr->payloads[i].payload_state, 2843 mgr->payloads[i].start_slot, 2844 mgr->payloads[i].num_slots); 2845 2846 2847 } 2848 mutex_unlock(&mgr->payload_lock); 2849 2850 mutex_lock(&mgr->lock); 2851 if (mgr->mst_primary) { 2852 u8 buf[64]; 2853 bool bret; 2854 int ret; 2855 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); 2856 seq_printf(m, "dpcd: "); 2857 for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++) 2858 seq_printf(m, "%02x ", buf[i]); 2859 seq_printf(m, "\n"); 2860 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); 2861 seq_printf(m, "faux/mst: "); 2862 for (i = 0; i < 2; i++) 2863 seq_printf(m, "%02x ", buf[i]); 2864 seq_printf(m, "\n"); 2865 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); 2866 seq_printf(m, "mst ctrl: "); 2867 for (i = 0; i < 1; i++) 2868 seq_printf(m, "%02x ", buf[i]); 2869 seq_printf(m, "\n"); 2870 2871 /* dump the standard OUI branch header */ 2872 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); 2873 seq_printf(m, "branch oui: "); 2874 for (i = 0; i < 0x3; i++) 2875 seq_printf(m, "%02x", buf[i]); 2876 seq_printf(m, " devid: "); 2877 for (i = 0x3; i < 0x8; i++) 2878 seq_printf(m, "%c", buf[i]); 2879 seq_printf(m, " revision: hw: %x.%x sw: %x.%x", buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]); 2880 seq_printf(m, "\n"); 2881 bret = dump_dp_payload_table(mgr, buf); 2882 if (bret == true) { 2883 seq_printf(m, "payload table: "); 2884 for (i = 0; i < 63; i++) 2885 seq_printf(m, "%02x ", buf[i]); 2886 seq_printf(m, "\n"); 2887 } 2888 2889 } 2890 2891 mutex_unlock(&mgr->lock); 2892 2893 } 2894 EXPORT_SYMBOL(drm_dp_mst_dump_topology); 2895 #endif /* IS_ENABLED(CONFIG_DEBUG_FS) */ 2896 2897 static void drm_dp_tx_work(struct work_struct *work) 2898 { 2899 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); 2900 2901 mutex_lock(&mgr->qlock); 2902 if (mgr->tx_down_in_progress) 2903 process_single_down_tx_qlock(mgr); 2904 mutex_unlock(&mgr->qlock); 2905 } 2906 2907 static void drm_dp_free_mst_port(struct kref *kref) 2908 { 2909 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); 2910 kref_put(&port->parent->kref, drm_dp_free_mst_branch_device); 2911 kfree(port); 2912 } 2913 2914 static void drm_dp_destroy_connector_work(struct work_struct *work) 2915 { 2916 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work); 2917 struct drm_dp_mst_port *port; 2918 bool send_hotplug = false; 2919 /* 2920 * Not a regular list traverse as we have to drop the destroy 2921 * connector lock before destroying the connector, to avoid AB->BA 2922 * ordering between this lock and the config mutex. 2923 */ 2924 for (;;) { 2925 mutex_lock(&mgr->destroy_connector_lock); 2926 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next); 2927 if (!port) { 2928 mutex_unlock(&mgr->destroy_connector_lock); 2929 break; 2930 } 2931 list_del(&port->next); 2932 mutex_unlock(&mgr->destroy_connector_lock); 2933 2934 kref_init(&port->kref); 2935 INIT_LIST_HEAD(&port->next); 2936 2937 mgr->cbs->destroy_connector(mgr, port->connector); 2938 2939 drm_dp_port_teardown_pdt(port, port->pdt); 2940 port->pdt = DP_PEER_DEVICE_NONE; 2941 2942 if (!port->input && port->vcpi.vcpi > 0) { 2943 drm_dp_mst_reset_vcpi_slots(mgr, port); 2944 drm_dp_update_payload_part1(mgr); 2945 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); 2946 } 2947 2948 kref_put(&port->kref, drm_dp_free_mst_port); 2949 send_hotplug = true; 2950 } 2951 if (send_hotplug) 2952 (*mgr->cbs->hotplug)(mgr); 2953 } 2954 2955 /** 2956 * drm_dp_mst_topology_mgr_init - initialise a topology manager 2957 * @mgr: manager struct to initialise 2958 * @dev: device providing this structure - for i2c addition. 2959 * @aux: DP helper aux channel to talk to this device 2960 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit 2961 * @max_payloads: maximum number of payloads this GPU can source 2962 * @conn_base_id: the connector object ID the MST device is connected to. 2963 * 2964 * Return 0 for success, or negative error code on failure 2965 */ 2966 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, 2967 struct device *dev, struct drm_dp_aux *aux, 2968 int max_dpcd_transaction_bytes, 2969 int max_payloads, int conn_base_id) 2970 { 2971 mutex_init(&mgr->lock); 2972 mutex_init(&mgr->qlock); 2973 mutex_init(&mgr->payload_lock); 2974 mutex_init(&mgr->destroy_connector_lock); 2975 INIT_LIST_HEAD(&mgr->tx_msg_downq); 2976 INIT_LIST_HEAD(&mgr->destroy_connector_list); 2977 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); 2978 INIT_WORK(&mgr->tx_work, drm_dp_tx_work); 2979 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work); 2980 #ifdef __NetBSD__ 2981 DRM_INIT_WAITQUEUE(&mgr->tx_waitq, "dpmstwait"); 2982 #else 2983 init_waitqueue_head(&mgr->tx_waitq); 2984 #endif 2985 mgr->dev = dev; 2986 mgr->aux = aux; 2987 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; 2988 mgr->max_payloads = max_payloads; 2989 mgr->conn_base_id = conn_base_id; 2990 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); 2991 if (!mgr->payloads) 2992 return -ENOMEM; 2993 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); 2994 if (!mgr->proposed_vcpis) 2995 return -ENOMEM; 2996 set_bit(0, &mgr->payload_mask); 2997 test_calc_pbn_mode(); 2998 return 0; 2999 } 3000 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); 3001 3002 /** 3003 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. 3004 * @mgr: manager to destroy 3005 */ 3006 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) 3007 { 3008 flush_work(&mgr->work); 3009 flush_work(&mgr->destroy_connector_work); 3010 mutex_lock(&mgr->payload_lock); 3011 kfree(mgr->payloads); 3012 mgr->payloads = NULL; 3013 kfree(mgr->proposed_vcpis); 3014 mgr->proposed_vcpis = NULL; 3015 mutex_unlock(&mgr->payload_lock); 3016 mgr->dev = NULL; 3017 mgr->aux = NULL; 3018 #ifdef __NetBSD__ 3019 DRM_DESTROY_WAITQUEUE(&mgr->tx_waitq); 3020 #endif 3021 mutex_destroy(&mgr->destroy_connector_lock); 3022 mutex_destroy(&mgr->payload_lock); 3023 mutex_destroy(&mgr->qlock); 3024 mutex_destroy(&mgr->lock); 3025 } 3026 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); 3027 3028 /* I2C device */ 3029 static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, 3030 int num) 3031 { 3032 struct drm_dp_aux *aux = adapter->algo_data; 3033 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); 3034 struct drm_dp_mst_branch *mstb; 3035 struct drm_dp_mst_topology_mgr *mgr = port->mgr; 3036 unsigned int i; 3037 bool reading = false; 3038 struct drm_dp_sideband_msg_req_body msg; 3039 struct drm_dp_sideband_msg_tx *txmsg = NULL; 3040 int ret; 3041 3042 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); 3043 if (!mstb) 3044 return -EREMOTEIO; 3045 3046 /* construct i2c msg */ 3047 /* see if last msg is a read */ 3048 if (msgs[num - 1].flags & I2C_M_RD) 3049 reading = true; 3050 3051 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) { 3052 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); 3053 ret = -EIO; 3054 goto out; 3055 } 3056 3057 memset(&msg, 0, sizeof(msg)); 3058 msg.req_type = DP_REMOTE_I2C_READ; 3059 msg.u.i2c_read.num_transactions = num - 1; 3060 msg.u.i2c_read.port_number = port->port_num; 3061 for (i = 0; i < num - 1; i++) { 3062 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; 3063 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; 3064 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; 3065 } 3066 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; 3067 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; 3068 3069 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 3070 if (!txmsg) { 3071 ret = -ENOMEM; 3072 goto out; 3073 } 3074 3075 txmsg->dst = mstb; 3076 drm_dp_encode_sideband_req(&msg, txmsg); 3077 3078 drm_dp_queue_down_tx(mgr, txmsg); 3079 3080 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 3081 if (ret > 0) { 3082 3083 if (txmsg->reply.reply_type == 1) { /* got a NAK back */ 3084 ret = -EREMOTEIO; 3085 goto out; 3086 } 3087 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { 3088 ret = -EIO; 3089 goto out; 3090 } 3091 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); 3092 ret = num; 3093 } 3094 out: 3095 kfree(txmsg); 3096 drm_dp_put_mst_branch_device(mstb); 3097 return ret; 3098 } 3099 3100 static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) 3101 { 3102 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | 3103 I2C_FUNC_SMBUS_READ_BLOCK_DATA | 3104 I2C_FUNC_SMBUS_BLOCK_PROC_CALL | 3105 I2C_FUNC_10BIT_ADDR; 3106 } 3107 3108 static const struct i2c_algorithm drm_dp_mst_i2c_algo = { 3109 .functionality = drm_dp_mst_i2c_functionality, 3110 .master_xfer = drm_dp_mst_i2c_xfer, 3111 }; 3112 3113 /** 3114 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX 3115 * @aux: DisplayPort AUX channel 3116 * 3117 * Returns 0 on success or a negative error code on failure. 3118 */ 3119 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) 3120 { 3121 aux->ddc.algo = &drm_dp_mst_i2c_algo; 3122 aux->ddc.algo_data = aux; 3123 aux->ddc.retries = 3; 3124 3125 aux->ddc.class = I2C_CLASS_DDC; 3126 aux->ddc.owner = THIS_MODULE; 3127 aux->ddc.dev.parent = aux->dev; 3128 #ifndef __NetBSD__ /* XXX of? */ 3129 aux->ddc.dev.of_node = aux->dev->of_node; 3130 #endif 3131 3132 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), 3133 sizeof(aux->ddc.name)); 3134 3135 return i2c_add_adapter(&aux->ddc); 3136 } 3137 3138 /** 3139 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter 3140 * @aux: DisplayPort AUX channel 3141 */ 3142 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) 3143 { 3144 i2c_del_adapter(&aux->ddc); 3145 } 3146
Indexes created Wed Oct 01 18:09:54 GMT 2025