drm_dp_mst_topology.c revision 1.3.2.2
1 /* $NetBSD: drm_dp_mst_topology.c,v 1.3.2.2 2018/09/06 06:56:09 pgoyette 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 1.3.2.2 2018/09/06 06:56:09 pgoyette 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 /** 44 * DOC: dp mst helper 45 * 46 * These functions contain parts of the DisplayPort 1.2a MultiStream Transport 47 * protocol. The helpers contain a topology manager and bandwidth manager. 48 * The helpers encapsulate the sending and received of sideband msgs. 49 */ 50 #if IS_ENABLED(CONFIG_DEBUG_FS) 51 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, 52 char *buf); 53 #endif 54 static int test_calc_pbn_mode(void); 55 56 static void drm_dp_put_port(struct drm_dp_mst_port *port); 57 58 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, 59 int id, 60 struct drm_dp_payload *payload); 61 62 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, 63 struct drm_dp_mst_port *port, 64 int offset, int size, u8 *bytes); 65 66 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, 67 struct drm_dp_mst_branch *mstb); 68 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, 69 struct drm_dp_mst_branch *mstb, 70 struct drm_dp_mst_port *port); 71 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, 72 u8 *guid); 73 74 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); 75 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); 76 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); 77 /* sideband msg handling */ 78 static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) 79 { 80 u8 bitmask = 0x80; 81 u8 bitshift = 7; 82 u8 array_index = 0; 83 int number_of_bits = num_nibbles * 4; 84 u8 remainder = 0; 85 86 while (number_of_bits != 0) { 87 number_of_bits--; 88 remainder <<= 1; 89 remainder |= (data[array_index] & bitmask) >> bitshift; 90 bitmask >>= 1; 91 bitshift--; 92 if (bitmask == 0) { 93 bitmask = 0x80; 94 bitshift = 7; 95 array_index++; 96 } 97 if ((remainder & 0x10) == 0x10) 98 remainder ^= 0x13; 99 } 100 101 number_of_bits = 4; 102 while (number_of_bits != 0) { 103 number_of_bits--; 104 remainder <<= 1; 105 if ((remainder & 0x10) != 0) 106 remainder ^= 0x13; 107 } 108 109 return remainder; 110 } 111 112 static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) 113 { 114 u8 bitmask = 0x80; 115 u8 bitshift = 7; 116 u8 array_index = 0; 117 int number_of_bits = number_of_bytes * 8; 118 u16 remainder = 0; 119 120 while (number_of_bits != 0) { 121 number_of_bits--; 122 remainder <<= 1; 123 remainder |= (data[array_index] & bitmask) >> bitshift; 124 bitmask >>= 1; 125 bitshift--; 126 if (bitmask == 0) { 127 bitmask = 0x80; 128 bitshift = 7; 129 array_index++; 130 } 131 if ((remainder & 0x100) == 0x100) 132 remainder ^= 0xd5; 133 } 134 135 number_of_bits = 8; 136 while (number_of_bits != 0) { 137 number_of_bits--; 138 remainder <<= 1; 139 if ((remainder & 0x100) != 0) 140 remainder ^= 0xd5; 141 } 142 143 return remainder & 0xff; 144 } 145 static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) 146 { 147 u8 size = 3; 148 size += (hdr->lct / 2); 149 return size; 150 } 151 152 static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, 153 u8 *buf, int *len) 154 { 155 int idx = 0; 156 int i; 157 u8 crc4; 158 buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); 159 for (i = 0; i < (hdr->lct / 2); i++) 160 buf[idx++] = hdr->rad[i]; 161 buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | 162 (hdr->msg_len & 0x3f); 163 buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); 164 165 crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); 166 buf[idx - 1] |= (crc4 & 0xf); 167 168 *len = idx; 169 } 170 171 static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, 172 u8 *buf, int buflen, u8 *hdrlen) 173 { 174 u8 crc4; 175 u8 len; 176 int i; 177 u8 idx; 178 if (buf[0] == 0) 179 return false; 180 len = 3; 181 len += ((buf[0] & 0xf0) >> 4) / 2; 182 if (len > buflen) 183 return false; 184 crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); 185 186 if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { 187 DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); 188 return false; 189 } 190 191 hdr->lct = (buf[0] & 0xf0) >> 4; 192 hdr->lcr = (buf[0] & 0xf); 193 idx = 1; 194 for (i = 0; i < (hdr->lct / 2); i++) 195 hdr->rad[i] = buf[idx++]; 196 hdr->broadcast = (buf[idx] >> 7) & 0x1; 197 hdr->path_msg = (buf[idx] >> 6) & 0x1; 198 hdr->msg_len = buf[idx] & 0x3f; 199 idx++; 200 hdr->somt = (buf[idx] >> 7) & 0x1; 201 hdr->eomt = (buf[idx] >> 6) & 0x1; 202 hdr->seqno = (buf[idx] >> 4) & 0x1; 203 idx++; 204 *hdrlen = idx; 205 return true; 206 } 207 208 static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, 209 struct drm_dp_sideband_msg_tx *raw) 210 { 211 int idx = 0; 212 int i; 213 u8 *buf = raw->msg; 214 buf[idx++] = req->req_type & 0x7f; 215 216 switch (req->req_type) { 217 case DP_ENUM_PATH_RESOURCES: 218 buf[idx] = (req->u.port_num.port_number & 0xf) << 4; 219 idx++; 220 break; 221 case DP_ALLOCATE_PAYLOAD: 222 buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | 223 (req->u.allocate_payload.number_sdp_streams & 0xf); 224 idx++; 225 buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); 226 idx++; 227 buf[idx] = (req->u.allocate_payload.pbn >> 8); 228 idx++; 229 buf[idx] = (req->u.allocate_payload.pbn & 0xff); 230 idx++; 231 for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { 232 buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | 233 (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); 234 idx++; 235 } 236 if (req->u.allocate_payload.number_sdp_streams & 1) { 237 i = req->u.allocate_payload.number_sdp_streams - 1; 238 buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; 239 idx++; 240 } 241 break; 242 case DP_QUERY_PAYLOAD: 243 buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; 244 idx++; 245 buf[idx] = (req->u.query_payload.vcpi & 0x7f); 246 idx++; 247 break; 248 case DP_REMOTE_DPCD_READ: 249 buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; 250 buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; 251 idx++; 252 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; 253 idx++; 254 buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); 255 idx++; 256 buf[idx] = (req->u.dpcd_read.num_bytes); 257 idx++; 258 break; 259 260 case DP_REMOTE_DPCD_WRITE: 261 buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; 262 buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; 263 idx++; 264 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; 265 idx++; 266 buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); 267 idx++; 268 buf[idx] = (req->u.dpcd_write.num_bytes); 269 idx++; 270 memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); 271 idx += req->u.dpcd_write.num_bytes; 272 break; 273 case DP_REMOTE_I2C_READ: 274 buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; 275 buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); 276 idx++; 277 for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { 278 buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; 279 idx++; 280 buf[idx] = req->u.i2c_read.transactions[i].num_bytes; 281 idx++; 282 memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); 283 idx += req->u.i2c_read.transactions[i].num_bytes; 284 285 buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; 286 buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); 287 idx++; 288 } 289 buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; 290 idx++; 291 buf[idx] = (req->u.i2c_read.num_bytes_read); 292 idx++; 293 break; 294 295 case DP_REMOTE_I2C_WRITE: 296 buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; 297 idx++; 298 buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; 299 idx++; 300 buf[idx] = (req->u.i2c_write.num_bytes); 301 idx++; 302 memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); 303 idx += req->u.i2c_write.num_bytes; 304 break; 305 } 306 raw->cur_len = idx; 307 } 308 309 static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) 310 { 311 u8 crc4; 312 crc4 = drm_dp_msg_data_crc4(msg, len); 313 msg[len] = crc4; 314 } 315 316 static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, 317 struct drm_dp_sideband_msg_tx *raw) 318 { 319 int idx = 0; 320 u8 *buf = raw->msg; 321 322 buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); 323 324 raw->cur_len = idx; 325 } 326 327 /* this adds a chunk of msg to the builder to get the final msg */ 328 static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, 329 u8 *replybuf, u8 replybuflen, bool hdr) 330 { 331 int ret; 332 u8 crc4 __unused; /* XXX Mistake? */ 333 334 if (hdr) { 335 u8 hdrlen; 336 struct drm_dp_sideband_msg_hdr recv_hdr; 337 ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); 338 if (ret == false) { 339 print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); 340 return false; 341 } 342 343 /* 344 * ignore out-of-order messages or messages that are part of a 345 * failed transaction 346 */ 347 if (!recv_hdr.somt && !msg->have_somt) 348 return false; 349 350 /* get length contained in this portion */ 351 msg->curchunk_len = recv_hdr.msg_len; 352 msg->curchunk_hdrlen = hdrlen; 353 354 /* we have already gotten an somt - don't bother parsing */ 355 if (recv_hdr.somt && msg->have_somt) 356 return false; 357 358 if (recv_hdr.somt) { 359 memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); 360 msg->have_somt = true; 361 } 362 if (recv_hdr.eomt) 363 msg->have_eomt = true; 364 365 /* copy the bytes for the remainder of this header chunk */ 366 msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); 367 memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); 368 } else { 369 memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); 370 msg->curchunk_idx += replybuflen; 371 } 372 373 if (msg->curchunk_idx >= msg->curchunk_len) { 374 /* do CRC */ 375 crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); 376 /* copy chunk into bigger msg */ 377 memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); 378 msg->curlen += msg->curchunk_len - 1; 379 } 380 return true; 381 } 382 383 static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, 384 struct drm_dp_sideband_msg_reply_body *repmsg) 385 { 386 int idx = 1; 387 int i; 388 memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); 389 idx += 16; 390 repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; 391 idx++; 392 if (idx > raw->curlen) 393 goto fail_len; 394 for (i = 0; i < repmsg->u.link_addr.nports; i++) { 395 if (raw->msg[idx] & 0x80) 396 repmsg->u.link_addr.ports[i].input_port = 1; 397 398 repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; 399 repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); 400 401 idx++; 402 if (idx > raw->curlen) 403 goto fail_len; 404 repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; 405 repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; 406 if (repmsg->u.link_addr.ports[i].input_port == 0) 407 repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; 408 idx++; 409 if (idx > raw->curlen) 410 goto fail_len; 411 if (repmsg->u.link_addr.ports[i].input_port == 0) { 412 repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); 413 idx++; 414 if (idx > raw->curlen) 415 goto fail_len; 416 memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); 417 idx += 16; 418 if (idx > raw->curlen) 419 goto fail_len; 420 repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; 421 repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); 422 idx++; 423 424 } 425 if (idx > raw->curlen) 426 goto fail_len; 427 } 428 429 return true; 430 fail_len: 431 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); 432 return false; 433 } 434 435 static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, 436 struct drm_dp_sideband_msg_reply_body *repmsg) 437 { 438 int idx = 1; 439 repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; 440 idx++; 441 if (idx > raw->curlen) 442 goto fail_len; 443 repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; 444 if (idx > raw->curlen) 445 goto fail_len; 446 447 memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); 448 return true; 449 fail_len: 450 DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); 451 return false; 452 } 453 454 static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, 455 struct drm_dp_sideband_msg_reply_body *repmsg) 456 { 457 int idx = 1; 458 repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; 459 idx++; 460 if (idx > raw->curlen) 461 goto fail_len; 462 return true; 463 fail_len: 464 DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); 465 return false; 466 } 467 468 static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, 469 struct drm_dp_sideband_msg_reply_body *repmsg) 470 { 471 int idx = 1; 472 473 repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); 474 idx++; 475 if (idx > raw->curlen) 476 goto fail_len; 477 repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; 478 idx++; 479 /* TODO check */ 480 memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); 481 return true; 482 fail_len: 483 DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); 484 return false; 485 } 486 487 static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, 488 struct drm_dp_sideband_msg_reply_body *repmsg) 489 { 490 int idx = 1; 491 repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; 492 idx++; 493 if (idx > raw->curlen) 494 goto fail_len; 495 repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); 496 idx += 2; 497 if (idx > raw->curlen) 498 goto fail_len; 499 repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); 500 idx += 2; 501 if (idx > raw->curlen) 502 goto fail_len; 503 return true; 504 fail_len: 505 DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); 506 return false; 507 } 508 509 static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, 510 struct drm_dp_sideband_msg_reply_body *repmsg) 511 { 512 int idx = 1; 513 repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; 514 idx++; 515 if (idx > raw->curlen) 516 goto fail_len; 517 repmsg->u.allocate_payload.vcpi = raw->msg[idx]; 518 idx++; 519 if (idx > raw->curlen) 520 goto fail_len; 521 repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); 522 idx += 2; 523 if (idx > raw->curlen) 524 goto fail_len; 525 return true; 526 fail_len: 527 DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); 528 return false; 529 } 530 531 static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, 532 struct drm_dp_sideband_msg_reply_body *repmsg) 533 { 534 int idx = 1; 535 repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; 536 idx++; 537 if (idx > raw->curlen) 538 goto fail_len; 539 repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); 540 idx += 2; 541 if (idx > raw->curlen) 542 goto fail_len; 543 return true; 544 fail_len: 545 DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); 546 return false; 547 } 548 549 static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, 550 struct drm_dp_sideband_msg_reply_body *msg) 551 { 552 memset(msg, 0, sizeof(*msg)); 553 msg->reply_type = (raw->msg[0] & 0x80) >> 7; 554 msg->req_type = (raw->msg[0] & 0x7f); 555 556 if (msg->reply_type) { 557 memcpy(msg->u.nak.guid, &raw->msg[1], 16); 558 msg->u.nak.reason = raw->msg[17]; 559 msg->u.nak.nak_data = raw->msg[18]; 560 return false; 561 } 562 563 switch (msg->req_type) { 564 case DP_LINK_ADDRESS: 565 return drm_dp_sideband_parse_link_address(raw, msg); 566 case DP_QUERY_PAYLOAD: 567 return drm_dp_sideband_parse_query_payload_ack(raw, msg); 568 case DP_REMOTE_DPCD_READ: 569 return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); 570 case DP_REMOTE_DPCD_WRITE: 571 return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); 572 case DP_REMOTE_I2C_READ: 573 return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); 574 case DP_ENUM_PATH_RESOURCES: 575 return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); 576 case DP_ALLOCATE_PAYLOAD: 577 return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); 578 default: 579 DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); 580 return false; 581 } 582 } 583 584 static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, 585 struct drm_dp_sideband_msg_req_body *msg) 586 { 587 int idx = 1; 588 589 msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; 590 idx++; 591 if (idx > raw->curlen) 592 goto fail_len; 593 594 memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); 595 idx += 16; 596 if (idx > raw->curlen) 597 goto fail_len; 598 599 msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; 600 msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; 601 msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; 602 msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; 603 msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); 604 idx++; 605 return true; 606 fail_len: 607 DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); 608 return false; 609 } 610 611 static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, 612 struct drm_dp_sideband_msg_req_body *msg) 613 { 614 int idx = 1; 615 616 msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; 617 idx++; 618 if (idx > raw->curlen) 619 goto fail_len; 620 621 memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); 622 idx += 16; 623 if (idx > raw->curlen) 624 goto fail_len; 625 626 msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); 627 idx++; 628 return true; 629 fail_len: 630 DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); 631 return false; 632 } 633 634 static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, 635 struct drm_dp_sideband_msg_req_body *msg) 636 { 637 memset(msg, 0, sizeof(*msg)); 638 msg->req_type = (raw->msg[0] & 0x7f); 639 640 switch (msg->req_type) { 641 case DP_CONNECTION_STATUS_NOTIFY: 642 return drm_dp_sideband_parse_connection_status_notify(raw, msg); 643 case DP_RESOURCE_STATUS_NOTIFY: 644 return drm_dp_sideband_parse_resource_status_notify(raw, msg); 645 default: 646 DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); 647 return false; 648 } 649 } 650 651 static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) 652 { 653 struct drm_dp_sideband_msg_req_body req; 654 655 req.req_type = DP_REMOTE_DPCD_WRITE; 656 req.u.dpcd_write.port_number = port_num; 657 req.u.dpcd_write.dpcd_address = offset; 658 req.u.dpcd_write.num_bytes = num_bytes; 659 req.u.dpcd_write.bytes = bytes; 660 drm_dp_encode_sideband_req(&req, msg); 661 662 return 0; 663 } 664 665 static int build_link_address(struct drm_dp_sideband_msg_tx *msg) 666 { 667 struct drm_dp_sideband_msg_req_body req; 668 669 req.req_type = DP_LINK_ADDRESS; 670 drm_dp_encode_sideband_req(&req, msg); 671 return 0; 672 } 673 674 static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) 675 { 676 struct drm_dp_sideband_msg_req_body req; 677 678 req.req_type = DP_ENUM_PATH_RESOURCES; 679 req.u.port_num.port_number = port_num; 680 drm_dp_encode_sideband_req(&req, msg); 681 msg->path_msg = true; 682 return 0; 683 } 684 685 static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, 686 u8 vcpi, uint16_t pbn) 687 { 688 struct drm_dp_sideband_msg_req_body req; 689 memset(&req, 0, sizeof(req)); 690 req.req_type = DP_ALLOCATE_PAYLOAD; 691 req.u.allocate_payload.port_number = port_num; 692 req.u.allocate_payload.vcpi = vcpi; 693 req.u.allocate_payload.pbn = pbn; 694 drm_dp_encode_sideband_req(&req, msg); 695 msg->path_msg = true; 696 return 0; 697 } 698 699 static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, 700 struct drm_dp_vcpi *vcpi) 701 { 702 int ret, vcpi_ret; 703 704 mutex_lock(&mgr->payload_lock); 705 ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); 706 if (ret > mgr->max_payloads) { 707 ret = -EINVAL; 708 DRM_DEBUG_KMS("out of payload ids %d\n", ret); 709 goto out_unlock; 710 } 711 712 vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); 713 if (vcpi_ret > mgr->max_payloads) { 714 ret = -EINVAL; 715 DRM_DEBUG_KMS("out of vcpi ids %d\n", ret); 716 goto out_unlock; 717 } 718 719 set_bit(ret, &mgr->payload_mask); 720 set_bit(vcpi_ret, &mgr->vcpi_mask); 721 vcpi->vcpi = vcpi_ret + 1; 722 mgr->proposed_vcpis[ret - 1] = vcpi; 723 out_unlock: 724 mutex_unlock(&mgr->payload_lock); 725 return ret; 726 } 727 728 static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, 729 int vcpi) 730 { 731 int i; 732 if (vcpi == 0) 733 return; 734 735 mutex_lock(&mgr->payload_lock); 736 DRM_DEBUG_KMS("putting payload %d\n", vcpi); 737 clear_bit(vcpi - 1, &mgr->vcpi_mask); 738 739 for (i = 0; i < mgr->max_payloads; i++) { 740 if (mgr->proposed_vcpis[i]) 741 if (mgr->proposed_vcpis[i]->vcpi == vcpi) { 742 mgr->proposed_vcpis[i] = NULL; 743 clear_bit(i + 1, &mgr->payload_mask); 744 } 745 } 746 mutex_unlock(&mgr->payload_lock); 747 } 748 749 static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, 750 struct drm_dp_sideband_msg_tx *txmsg) 751 { 752 bool ret; 753 754 /* 755 * All updates to txmsg->state are protected by mgr->qlock, and the two 756 * cases we check here are terminal states. For those the barriers 757 * provided by the wake_up/wait_event pair are enough. 758 */ 759 ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX || 760 txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT); 761 return ret; 762 } 763 764 static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, 765 struct drm_dp_sideband_msg_tx *txmsg) 766 { 767 struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; 768 int ret; 769 770 #ifdef __NetBSD__ 771 mutex_lock(&mstb->mgr->qlock); 772 DRM_TIMED_WAIT_UNTIL(ret, &mgr->tx_waitq, &mstb->mgr->qlock, 4*HZ, 773 check_txmsg_state(mgr, txmsg)); 774 #else 775 ret = wait_event_timeout(mgr->tx_waitq, 776 check_txmsg_state(mgr, txmsg), 777 (4 * HZ)); 778 mutex_lock(&mstb->mgr->qlock); 779 #endif 780 if (ret > 0) { 781 if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { 782 ret = -EIO; 783 goto out; 784 } 785 } else { 786 DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); 787 788 /* dump some state */ 789 ret = -EIO; 790 791 /* remove from q */ 792 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || 793 txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { 794 list_del(&txmsg->next); 795 } 796 797 if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || 798 txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { 799 mstb->tx_slots[txmsg->seqno] = NULL; 800 } 801 } 802 out: 803 mutex_unlock(&mgr->qlock); 804 805 return ret; 806 } 807 808 static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) 809 { 810 struct drm_dp_mst_branch *mstb; 811 812 mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); 813 if (!mstb) 814 return NULL; 815 816 mstb->lct = lct; 817 if (lct > 1) 818 memcpy(mstb->rad, rad, lct / 2); 819 INIT_LIST_HEAD(&mstb->ports); 820 kref_init(&mstb->kref); 821 return mstb; 822 } 823 824 static void drm_dp_free_mst_port(struct kref *kref); 825 826 static void drm_dp_free_mst_branch_device(struct kref *kref) 827 { 828 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); 829 if (mstb->port_parent) { 830 if (list_empty(&mstb->port_parent->next)) 831 kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port); 832 } 833 kfree(mstb); 834 } 835 836 static void drm_dp_destroy_mst_branch_device(struct kref *kref) 837 { 838 struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); 839 struct drm_dp_mst_port *port, *tmp; 840 bool wake_tx = false; 841 842 /* 843 * init kref again to be used by ports to remove mst branch when it is 844 * not needed anymore 845 */ 846 kref_init(kref); 847 848 if (mstb->port_parent && list_empty(&mstb->port_parent->next)) 849 kref_get(&mstb->port_parent->kref); 850 851 /* 852 * destroy all ports - don't need lock 853 * as there are no more references to the mst branch 854 * device at this point. 855 */ 856 list_for_each_entry_safe(port, tmp, &mstb->ports, next) { 857 list_del(&port->next); 858 drm_dp_put_port(port); 859 } 860 861 /* drop any tx slots msg */ 862 mutex_lock(&mstb->mgr->qlock); 863 if (mstb->tx_slots[0]) { 864 mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; 865 mstb->tx_slots[0] = NULL; 866 wake_tx = true; 867 } 868 if (mstb->tx_slots[1]) { 869 mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; 870 mstb->tx_slots[1] = NULL; 871 wake_tx = true; 872 } 873 #ifdef __NetBSD__ 874 if (wake_tx) 875 DRM_WAKEUP_ONE(&mstb->mgr->tx_waitq, &mstb->mgr->qlock); 876 mutex_unlock(&mstb->mgr->qlock); 877 #else 878 mutex_unlock(&mstb->mgr->qlock); 879 880 if (wake_tx) 881 wake_up(&mstb->mgr->tx_waitq); 882 #endif 883 884 kref_put(kref, drm_dp_free_mst_branch_device); 885 } 886 887 static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) 888 { 889 kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); 890 } 891 892 893 static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) 894 { 895 struct drm_dp_mst_branch *mstb; 896 897 switch (old_pdt) { 898 case DP_PEER_DEVICE_DP_LEGACY_CONV: 899 case DP_PEER_DEVICE_SST_SINK: 900 /* remove i2c over sideband */ 901 drm_dp_mst_unregister_i2c_bus(&port->aux); 902 break; 903 case DP_PEER_DEVICE_MST_BRANCHING: 904 mstb = port->mstb; 905 port->mstb = NULL; 906 drm_dp_put_mst_branch_device(mstb); 907 break; 908 } 909 } 910 911 static void drm_dp_destroy_port(struct kref *kref) 912 { 913 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); 914 struct drm_dp_mst_topology_mgr *mgr = port->mgr; 915 916 if (!port->input) { 917 port->vcpi.num_slots = 0; 918 919 kfree(port->cached_edid); 920 921 /* 922 * The only time we don't have a connector 923 * on an output port is if the connector init 924 * fails. 925 */ 926 if (port->connector) { 927 /* we can't destroy the connector here, as 928 * we might be holding the mode_config.mutex 929 * from an EDID retrieval */ 930 931 mutex_lock(&mgr->destroy_connector_lock); 932 kref_get(&port->parent->kref); 933 list_add(&port->next, &mgr->destroy_connector_list); 934 mutex_unlock(&mgr->destroy_connector_lock); 935 schedule_work(&mgr->destroy_connector_work); 936 return; 937 } 938 /* no need to clean up vcpi 939 * as if we have no connector we never setup a vcpi */ 940 drm_dp_port_teardown_pdt(port, port->pdt); 941 port->pdt = DP_PEER_DEVICE_NONE; 942 } 943 kfree(port); 944 } 945 946 static void drm_dp_put_port(struct drm_dp_mst_port *port) 947 { 948 kref_put(&port->kref, drm_dp_destroy_port); 949 } 950 951 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) 952 { 953 struct drm_dp_mst_port *port; 954 struct drm_dp_mst_branch *rmstb; 955 if (to_find == mstb) { 956 kref_get(&mstb->kref); 957 return mstb; 958 } 959 list_for_each_entry(port, &mstb->ports, next) { 960 if (port->mstb) { 961 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); 962 if (rmstb) 963 return rmstb; 964 } 965 } 966 return NULL; 967 } 968 969 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) 970 { 971 struct drm_dp_mst_branch *rmstb = NULL; 972 mutex_lock(&mgr->lock); 973 if (mgr->mst_primary) 974 rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb); 975 mutex_unlock(&mgr->lock); 976 return rmstb; 977 } 978 979 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) 980 { 981 struct drm_dp_mst_port *port, *mport; 982 983 list_for_each_entry(port, &mstb->ports, next) { 984 if (port == to_find) { 985 kref_get(&port->kref); 986 return port; 987 } 988 if (port->mstb) { 989 mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); 990 if (mport) 991 return mport; 992 } 993 } 994 return NULL; 995 } 996 997 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) 998 { 999 struct drm_dp_mst_port *rport = NULL; 1000 mutex_lock(&mgr->lock); 1001 if (mgr->mst_primary) 1002 rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); 1003 mutex_unlock(&mgr->lock); 1004 return rport; 1005 } 1006 1007 static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) 1008 { 1009 struct drm_dp_mst_port *port; 1010 1011 list_for_each_entry(port, &mstb->ports, next) { 1012 if (port->port_num == port_num) { 1013 kref_get(&port->kref); 1014 return port; 1015 } 1016 } 1017 1018 return NULL; 1019 } 1020 1021 /* 1022 * calculate a new RAD for this MST branch device 1023 * if parent has an LCT of 2 then it has 1 nibble of RAD, 1024 * if parent has an LCT of 3 then it has 2 nibbles of RAD, 1025 */ 1026 static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, 1027 u8 *rad) 1028 { 1029 int parent_lct = port->parent->lct; 1030 int shift = 4; 1031 int idx = (parent_lct - 1) / 2; 1032 if (parent_lct > 1) { 1033 memcpy(rad, port->parent->rad, idx + 1); 1034 shift = (parent_lct % 2) ? 4 : 0; 1035 } else 1036 rad[0] = 0; 1037 1038 rad[idx] |= port->port_num << shift; 1039 return parent_lct + 1; 1040 } 1041 1042 /* 1043 * return sends link address for new mstb 1044 */ 1045 static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) 1046 { 1047 int ret __unused; 1048 u8 rad[6], lct; 1049 bool send_link = false; 1050 switch (port->pdt) { 1051 case DP_PEER_DEVICE_DP_LEGACY_CONV: 1052 case DP_PEER_DEVICE_SST_SINK: 1053 /* add i2c over sideband */ 1054 ret = drm_dp_mst_register_i2c_bus(&port->aux); 1055 break; 1056 case DP_PEER_DEVICE_MST_BRANCHING: 1057 lct = drm_dp_calculate_rad(port, rad); 1058 1059 port->mstb = drm_dp_add_mst_branch_device(lct, rad); 1060 port->mstb->mgr = port->mgr; 1061 port->mstb->port_parent = port; 1062 1063 send_link = true; 1064 break; 1065 } 1066 return send_link; 1067 } 1068 1069 static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) 1070 { 1071 int ret __unused; 1072 1073 memcpy(mstb->guid, guid, 16); 1074 1075 if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { 1076 if (mstb->port_parent) { 1077 ret = drm_dp_send_dpcd_write( 1078 mstb->mgr, 1079 mstb->port_parent, 1080 DP_GUID, 1081 16, 1082 mstb->guid); 1083 } else { 1084 1085 ret = drm_dp_dpcd_write( 1086 mstb->mgr->aux, 1087 DP_GUID, 1088 mstb->guid, 1089 16); 1090 } 1091 } 1092 } 1093 1094 static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, 1095 int pnum, 1096 char *proppath, 1097 size_t proppath_size) 1098 { 1099 int i; 1100 char temp[8]; 1101 snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); 1102 for (i = 0; i < (mstb->lct - 1); i++) { 1103 int shift = (i % 2) ? 0 : 4; 1104 int port_num = (mstb->rad[i / 2] >> shift) & 0xf; 1105 snprintf(temp, sizeof(temp), "-%d", port_num); 1106 strlcat(proppath, temp, proppath_size); 1107 } 1108 snprintf(temp, sizeof(temp), "-%d", pnum); 1109 strlcat(proppath, temp, proppath_size); 1110 } 1111 1112 static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, 1113 struct device *dev, 1114 struct drm_dp_link_addr_reply_port *port_msg) 1115 { 1116 struct drm_dp_mst_port *port; 1117 bool ret; 1118 bool created = false; 1119 int old_pdt = 0; 1120 int old_ddps = 0; 1121 port = drm_dp_get_port(mstb, port_msg->port_number); 1122 if (!port) { 1123 port = kzalloc(sizeof(*port), GFP_KERNEL); 1124 if (!port) 1125 return; 1126 kref_init(&port->kref); 1127 port->parent = mstb; 1128 port->port_num = port_msg->port_number; 1129 port->mgr = mstb->mgr; 1130 port->aux.name = "DPMST"; 1131 port->aux.dev = dev; 1132 created = true; 1133 } else { 1134 old_pdt = port->pdt; 1135 old_ddps = port->ddps; 1136 } 1137 1138 port->pdt = port_msg->peer_device_type; 1139 port->input = port_msg->input_port; 1140 port->mcs = port_msg->mcs; 1141 port->ddps = port_msg->ddps; 1142 port->ldps = port_msg->legacy_device_plug_status; 1143 port->dpcd_rev = port_msg->dpcd_revision; 1144 port->num_sdp_streams = port_msg->num_sdp_streams; 1145 port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; 1146 1147 /* manage mstb port lists with mgr lock - take a reference 1148 for this list */ 1149 if (created) { 1150 mutex_lock(&mstb->mgr->lock); 1151 kref_get(&port->kref); 1152 list_add(&port->next, &mstb->ports); 1153 mutex_unlock(&mstb->mgr->lock); 1154 } 1155 1156 if (old_ddps != port->ddps) { 1157 if (port->ddps) { 1158 if (!port->input) 1159 drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); 1160 } else { 1161 port->available_pbn = 0; 1162 } 1163 } 1164 1165 if (old_pdt != port->pdt && !port->input) { 1166 drm_dp_port_teardown_pdt(port, old_pdt); 1167 1168 ret = drm_dp_port_setup_pdt(port); 1169 if (ret == true) 1170 drm_dp_send_link_address(mstb->mgr, port->mstb); 1171 } 1172 1173 if (created && !port->input) { 1174 char proppath[255]; 1175 1176 build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath)); 1177 port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath); 1178 if (!port->connector) { 1179 /* remove it from the port list */ 1180 mutex_lock(&mstb->mgr->lock); 1181 list_del(&port->next); 1182 mutex_unlock(&mstb->mgr->lock); 1183 /* drop port list reference */ 1184 drm_dp_put_port(port); 1185 goto out; 1186 } 1187 if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV || 1188 port->pdt == DP_PEER_DEVICE_SST_SINK) && 1189 port->port_num >= DP_MST_LOGICAL_PORT_0) { 1190 port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc); 1191 drm_mode_connector_set_tile_property(port->connector); 1192 } 1193 (*mstb->mgr->cbs->register_connector)(port->connector); 1194 } 1195 1196 out: 1197 /* put reference to this port */ 1198 drm_dp_put_port(port); 1199 } 1200 1201 static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, 1202 struct drm_dp_connection_status_notify *conn_stat) 1203 { 1204 struct drm_dp_mst_port *port; 1205 int old_pdt; 1206 int old_ddps; 1207 bool dowork = false; 1208 port = drm_dp_get_port(mstb, conn_stat->port_number); 1209 if (!port) 1210 return; 1211 1212 old_ddps = port->ddps; 1213 old_pdt = port->pdt; 1214 port->pdt = conn_stat->peer_device_type; 1215 port->mcs = conn_stat->message_capability_status; 1216 port->ldps = conn_stat->legacy_device_plug_status; 1217 port->ddps = conn_stat->displayport_device_plug_status; 1218 1219 if (old_ddps != port->ddps) { 1220 if (port->ddps) { 1221 dowork = true; 1222 } else { 1223 port->available_pbn = 0; 1224 } 1225 } 1226 if (old_pdt != port->pdt && !port->input) { 1227 drm_dp_port_teardown_pdt(port, old_pdt); 1228 1229 if (drm_dp_port_setup_pdt(port)) 1230 dowork = true; 1231 } 1232 1233 drm_dp_put_port(port); 1234 if (dowork) 1235 queue_work(system_long_wq, &mstb->mgr->work); 1236 1237 } 1238 1239 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, 1240 u8 lct, u8 *rad) 1241 { 1242 struct drm_dp_mst_branch *mstb; 1243 struct drm_dp_mst_port *port; 1244 int i; 1245 /* find the port by iterating down */ 1246 1247 mutex_lock(&mgr->lock); 1248 mstb = mgr->mst_primary; 1249 1250 for (i = 0; i < lct - 1; i++) { 1251 int shift = (i % 2) ? 0 : 4; 1252 int port_num = (rad[i / 2] >> shift) & 0xf; 1253 1254 list_for_each_entry(port, &mstb->ports, next) { 1255 if (port->port_num == port_num) { 1256 mstb = port->mstb; 1257 if (!mstb) { 1258 DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); 1259 goto out; 1260 } 1261 1262 break; 1263 } 1264 } 1265 } 1266 kref_get(&mstb->kref); 1267 out: 1268 mutex_unlock(&mgr->lock); 1269 return mstb; 1270 } 1271 1272 static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( 1273 struct drm_dp_mst_branch *mstb, 1274 uint8_t *guid) 1275 { 1276 struct drm_dp_mst_branch *found_mstb; 1277 struct drm_dp_mst_port *port; 1278 1279 if (memcmp(mstb->guid, guid, 16) == 0) 1280 return mstb; 1281 1282 1283 list_for_each_entry(port, &mstb->ports, next) { 1284 if (!port->mstb) 1285 continue; 1286 1287 found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); 1288 1289 if (found_mstb) 1290 return found_mstb; 1291 } 1292 1293 return NULL; 1294 } 1295 1296 static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid( 1297 struct drm_dp_mst_topology_mgr *mgr, 1298 uint8_t *guid) 1299 { 1300 struct drm_dp_mst_branch *mstb; 1301 1302 /* find the port by iterating down */ 1303 mutex_lock(&mgr->lock); 1304 1305 mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); 1306 1307 if (mstb) 1308 kref_get(&mstb->kref); 1309 1310 mutex_unlock(&mgr->lock); 1311 return mstb; 1312 } 1313 1314 static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, 1315 struct drm_dp_mst_branch *mstb) 1316 { 1317 struct drm_dp_mst_port *port; 1318 struct drm_dp_mst_branch *mstb_child; 1319 if (!mstb->link_address_sent) 1320 drm_dp_send_link_address(mgr, mstb); 1321 1322 list_for_each_entry(port, &mstb->ports, next) { 1323 if (port->input) 1324 continue; 1325 1326 if (!port->ddps) 1327 continue; 1328 1329 if (!port->available_pbn) 1330 drm_dp_send_enum_path_resources(mgr, mstb, port); 1331 1332 if (port->mstb) { 1333 mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb); 1334 if (mstb_child) { 1335 drm_dp_check_and_send_link_address(mgr, mstb_child); 1336 drm_dp_put_mst_branch_device(mstb_child); 1337 } 1338 } 1339 } 1340 } 1341 1342 static void drm_dp_mst_link_probe_work(struct work_struct *work) 1343 { 1344 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); 1345 struct drm_dp_mst_branch *mstb; 1346 1347 mutex_lock(&mgr->lock); 1348 mstb = mgr->mst_primary; 1349 if (mstb) { 1350 kref_get(&mstb->kref); 1351 } 1352 mutex_unlock(&mgr->lock); 1353 if (mstb) { 1354 drm_dp_check_and_send_link_address(mgr, mstb); 1355 drm_dp_put_mst_branch_device(mstb); 1356 } 1357 } 1358 1359 static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, 1360 u8 *guid) 1361 { 1362 static u8 zero_guid[16]; 1363 1364 if (!memcmp(guid, zero_guid, 16)) { 1365 u64 salt = get_jiffies_64(); 1366 memcpy(&guid[0], &salt, sizeof(u64)); 1367 memcpy(&guid[8], &salt, sizeof(u64)); 1368 return false; 1369 } 1370 return true; 1371 } 1372 1373 #if 0 1374 static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) 1375 { 1376 struct drm_dp_sideband_msg_req_body req; 1377 1378 req.req_type = DP_REMOTE_DPCD_READ; 1379 req.u.dpcd_read.port_number = port_num; 1380 req.u.dpcd_read.dpcd_address = offset; 1381 req.u.dpcd_read.num_bytes = num_bytes; 1382 drm_dp_encode_sideband_req(&req, msg); 1383 1384 return 0; 1385 } 1386 #endif 1387 1388 static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, 1389 bool up, u8 *msg, int len) 1390 { 1391 int ret; 1392 int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; 1393 int tosend, total, offset; 1394 int retries = 0; 1395 1396 retry: 1397 total = len; 1398 offset = 0; 1399 do { 1400 tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); 1401 1402 ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, 1403 &msg[offset], 1404 tosend); 1405 if (ret != tosend) { 1406 if (ret == -EIO && retries < 5) { 1407 retries++; 1408 goto retry; 1409 } 1410 DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); 1411 1412 return -EIO; 1413 } 1414 offset += tosend; 1415 total -= tosend; 1416 } while (total > 0); 1417 return 0; 1418 } 1419 1420 static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, 1421 struct drm_dp_sideband_msg_tx *txmsg) 1422 { 1423 struct drm_dp_mst_branch *mstb = txmsg->dst; 1424 u8 req_type; 1425 1426 /* both msg slots are full */ 1427 if (txmsg->seqno == -1) { 1428 if (mstb->tx_slots[0] && mstb->tx_slots[1]) { 1429 DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); 1430 return -EAGAIN; 1431 } 1432 if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { 1433 txmsg->seqno = mstb->last_seqno; 1434 mstb->last_seqno ^= 1; 1435 } else if (mstb->tx_slots[0] == NULL) 1436 txmsg->seqno = 0; 1437 else 1438 txmsg->seqno = 1; 1439 mstb->tx_slots[txmsg->seqno] = txmsg; 1440 } 1441 1442 req_type = txmsg->msg[0] & 0x7f; 1443 if (req_type == DP_CONNECTION_STATUS_NOTIFY || 1444 req_type == DP_RESOURCE_STATUS_NOTIFY) 1445 hdr->broadcast = 1; 1446 else 1447 hdr->broadcast = 0; 1448 hdr->path_msg = txmsg->path_msg; 1449 hdr->lct = mstb->lct; 1450 hdr->lcr = mstb->lct - 1; 1451 if (mstb->lct > 1) 1452 memcpy(hdr->rad, mstb->rad, mstb->lct / 2); 1453 hdr->seqno = txmsg->seqno; 1454 return 0; 1455 } 1456 /* 1457 * process a single block of the next message in the sideband queue 1458 */ 1459 static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, 1460 struct drm_dp_sideband_msg_tx *txmsg, 1461 bool up) 1462 { 1463 u8 chunk[48]; 1464 struct drm_dp_sideband_msg_hdr hdr; 1465 int len, space, idx, tosend; 1466 int ret; 1467 1468 memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); 1469 1470 if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { 1471 txmsg->seqno = -1; 1472 txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; 1473 } 1474 1475 /* make hdr from dst mst - for replies use seqno 1476 otherwise assign one */ 1477 ret = set_hdr_from_dst_qlock(&hdr, txmsg); 1478 if (ret < 0) 1479 return ret; 1480 1481 /* amount left to send in this message */ 1482 len = txmsg->cur_len - txmsg->cur_offset; 1483 1484 /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ 1485 space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); 1486 1487 tosend = min(len, space); 1488 if (len == txmsg->cur_len) 1489 hdr.somt = 1; 1490 if (space >= len) 1491 hdr.eomt = 1; 1492 1493 1494 hdr.msg_len = tosend + 1; 1495 drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); 1496 memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); 1497 /* add crc at end */ 1498 drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); 1499 idx += tosend + 1; 1500 1501 ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); 1502 if (ret) { 1503 DRM_DEBUG_KMS("sideband msg failed to send\n"); 1504 return ret; 1505 } 1506 1507 txmsg->cur_offset += tosend; 1508 if (txmsg->cur_offset == txmsg->cur_len) { 1509 txmsg->state = DRM_DP_SIDEBAND_TX_SENT; 1510 return 1; 1511 } 1512 return 0; 1513 } 1514 1515 static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) 1516 { 1517 struct drm_dp_sideband_msg_tx *txmsg; 1518 int ret; 1519 1520 WARN_ON(!mutex_is_locked(&mgr->qlock)); 1521 1522 /* construct a chunk from the first msg in the tx_msg queue */ 1523 if (list_empty(&mgr->tx_msg_downq)) { 1524 mgr->tx_down_in_progress = false; 1525 return; 1526 } 1527 mgr->tx_down_in_progress = true; 1528 1529 txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); 1530 ret = process_single_tx_qlock(mgr, txmsg, false); 1531 if (ret == 1) { 1532 /* txmsg is sent it should be in the slots now */ 1533 list_del(&txmsg->next); 1534 } else if (ret) { 1535 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); 1536 list_del(&txmsg->next); 1537 if (txmsg->seqno != -1) 1538 txmsg->dst->tx_slots[txmsg->seqno] = NULL; 1539 txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; 1540 #ifdef __NetBSD__ 1541 DRM_WAKEUP_ONE(&mgr->tx_waitq, &mgr->qlock); 1542 #else 1543 wake_up(&mgr->tx_waitq); 1544 #endif 1545 } 1546 if (list_empty(&mgr->tx_msg_downq)) { 1547 mgr->tx_down_in_progress = false; 1548 return; 1549 } 1550 } 1551 1552 /* called holding qlock */ 1553 static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, 1554 struct drm_dp_sideband_msg_tx *txmsg) 1555 { 1556 int ret; 1557 1558 /* construct a chunk from the first msg in the tx_msg queue */ 1559 ret = process_single_tx_qlock(mgr, txmsg, true); 1560 1561 if (ret != 1) 1562 DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); 1563 1564 txmsg->dst->tx_slots[txmsg->seqno] = NULL; 1565 } 1566 1567 static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, 1568 struct drm_dp_sideband_msg_tx *txmsg) 1569 { 1570 mutex_lock(&mgr->qlock); 1571 list_add_tail(&txmsg->next, &mgr->tx_msg_downq); 1572 if (!mgr->tx_down_in_progress) 1573 process_single_down_tx_qlock(mgr); 1574 mutex_unlock(&mgr->qlock); 1575 } 1576 1577 static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, 1578 struct drm_dp_mst_branch *mstb) 1579 { 1580 int len __unused; 1581 struct drm_dp_sideband_msg_tx *txmsg; 1582 int ret; 1583 1584 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1585 if (!txmsg) 1586 return; 1587 1588 txmsg->dst = mstb; 1589 len = build_link_address(txmsg); 1590 1591 mstb->link_address_sent = true; 1592 drm_dp_queue_down_tx(mgr, txmsg); 1593 1594 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1595 if (ret > 0) { 1596 int i; 1597 1598 if (txmsg->reply.reply_type == 1) 1599 DRM_DEBUG_KMS("link address nak received\n"); 1600 else { 1601 DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); 1602 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { 1603 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, 1604 txmsg->reply.u.link_addr.ports[i].input_port, 1605 txmsg->reply.u.link_addr.ports[i].peer_device_type, 1606 txmsg->reply.u.link_addr.ports[i].port_number, 1607 txmsg->reply.u.link_addr.ports[i].dpcd_revision, 1608 txmsg->reply.u.link_addr.ports[i].mcs, 1609 txmsg->reply.u.link_addr.ports[i].ddps, 1610 txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, 1611 txmsg->reply.u.link_addr.ports[i].num_sdp_streams, 1612 txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); 1613 } 1614 1615 drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid); 1616 1617 for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { 1618 drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); 1619 } 1620 (*mgr->cbs->hotplug)(mgr); 1621 } 1622 } else { 1623 mstb->link_address_sent = false; 1624 DRM_DEBUG_KMS("link address failed %d\n", ret); 1625 } 1626 1627 kfree(txmsg); 1628 } 1629 1630 static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, 1631 struct drm_dp_mst_branch *mstb, 1632 struct drm_dp_mst_port *port) 1633 { 1634 int len __unused; 1635 struct drm_dp_sideband_msg_tx *txmsg; 1636 int ret; 1637 1638 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1639 if (!txmsg) 1640 return -ENOMEM; 1641 1642 txmsg->dst = mstb; 1643 len = build_enum_path_resources(txmsg, port->port_num); 1644 1645 drm_dp_queue_down_tx(mgr, txmsg); 1646 1647 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1648 if (ret > 0) { 1649 if (txmsg->reply.reply_type == 1) 1650 DRM_DEBUG_KMS("enum path resources nak received\n"); 1651 else { 1652 if (port->port_num != txmsg->reply.u.path_resources.port_number) 1653 DRM_ERROR("got incorrect port in response\n"); 1654 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, 1655 txmsg->reply.u.path_resources.avail_payload_bw_number); 1656 port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; 1657 } 1658 } 1659 1660 kfree(txmsg); 1661 return 0; 1662 } 1663 1664 static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) 1665 { 1666 if (!mstb->port_parent) 1667 return NULL; 1668 1669 if (mstb->port_parent->mstb != mstb) 1670 return mstb->port_parent; 1671 1672 return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); 1673 } 1674 1675 static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, 1676 struct drm_dp_mst_branch *mstb, 1677 int *port_num) 1678 { 1679 struct drm_dp_mst_branch *rmstb = NULL; 1680 struct drm_dp_mst_port *found_port; 1681 mutex_lock(&mgr->lock); 1682 if (mgr->mst_primary) { 1683 found_port = drm_dp_get_last_connected_port_to_mstb(mstb); 1684 1685 if (found_port) { 1686 rmstb = found_port->parent; 1687 kref_get(&rmstb->kref); 1688 *port_num = found_port->port_num; 1689 } 1690 } 1691 mutex_unlock(&mgr->lock); 1692 return rmstb; 1693 } 1694 1695 static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, 1696 struct drm_dp_mst_port *port, 1697 int id, 1698 int pbn) 1699 { 1700 struct drm_dp_sideband_msg_tx *txmsg; 1701 struct drm_dp_mst_branch *mstb; 1702 int len __unused, ret, port_num; 1703 1704 port = drm_dp_get_validated_port_ref(mgr, port); 1705 if (!port) 1706 return -EINVAL; 1707 1708 port_num = port->port_num; 1709 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); 1710 if (!mstb) { 1711 mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num); 1712 1713 if (!mstb) { 1714 drm_dp_put_port(port); 1715 return -EINVAL; 1716 } 1717 } 1718 1719 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1720 if (!txmsg) { 1721 ret = -ENOMEM; 1722 goto fail_put; 1723 } 1724 1725 txmsg->dst = mstb; 1726 len = build_allocate_payload(txmsg, port_num, 1727 id, 1728 pbn); 1729 1730 drm_dp_queue_down_tx(mgr, txmsg); 1731 1732 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1733 if (ret > 0) { 1734 if (txmsg->reply.reply_type == 1) { 1735 ret = -EINVAL; 1736 } else 1737 ret = 0; 1738 } 1739 kfree(txmsg); 1740 fail_put: 1741 drm_dp_put_mst_branch_device(mstb); 1742 drm_dp_put_port(port); 1743 return ret; 1744 } 1745 1746 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, 1747 int id, 1748 struct drm_dp_payload *payload) 1749 { 1750 int ret; 1751 1752 ret = drm_dp_dpcd_write_payload(mgr, id, payload); 1753 if (ret < 0) { 1754 payload->payload_state = 0; 1755 return ret; 1756 } 1757 payload->payload_state = DP_PAYLOAD_LOCAL; 1758 return 0; 1759 } 1760 1761 static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, 1762 struct drm_dp_mst_port *port, 1763 int id, 1764 struct drm_dp_payload *payload) 1765 { 1766 int ret; 1767 ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); 1768 if (ret < 0) 1769 return ret; 1770 payload->payload_state = DP_PAYLOAD_REMOTE; 1771 return ret; 1772 } 1773 1774 static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, 1775 struct drm_dp_mst_port *port, 1776 int id, 1777 struct drm_dp_payload *payload) 1778 { 1779 DRM_DEBUG_KMS("\n"); 1780 /* its okay for these to fail */ 1781 if (port) { 1782 drm_dp_payload_send_msg(mgr, port, id, 0); 1783 } 1784 1785 drm_dp_dpcd_write_payload(mgr, id, payload); 1786 payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; 1787 return 0; 1788 } 1789 1790 static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, 1791 int id, 1792 struct drm_dp_payload *payload) 1793 { 1794 payload->payload_state = 0; 1795 return 0; 1796 } 1797 1798 /** 1799 * drm_dp_update_payload_part1() - Execute payload update part 1 1800 * @mgr: manager to use. 1801 * 1802 * This iterates over all proposed virtual channels, and tries to 1803 * allocate space in the link for them. For 0->slots transitions, 1804 * this step just writes the VCPI to the MST device. For slots->0 1805 * transitions, this writes the updated VCPIs and removes the 1806 * remote VC payloads. 1807 * 1808 * after calling this the driver should generate ACT and payload 1809 * packets. 1810 */ 1811 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) 1812 { 1813 int i, j; 1814 int cur_slots = 1; 1815 struct drm_dp_payload req_payload; 1816 struct drm_dp_mst_port *port; 1817 1818 mutex_lock(&mgr->payload_lock); 1819 for (i = 0; i < mgr->max_payloads; i++) { 1820 /* solve the current payloads - compare to the hw ones 1821 - update the hw view */ 1822 req_payload.start_slot = cur_slots; 1823 if (mgr->proposed_vcpis[i]) { 1824 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); 1825 port = drm_dp_get_validated_port_ref(mgr, port); 1826 if (!port) { 1827 mutex_unlock(&mgr->payload_lock); 1828 return -EINVAL; 1829 } 1830 req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; 1831 req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi; 1832 } else { 1833 port = NULL; 1834 req_payload.num_slots = 0; 1835 } 1836 1837 if (mgr->payloads[i].start_slot != req_payload.start_slot) { 1838 mgr->payloads[i].start_slot = req_payload.start_slot; 1839 } 1840 /* work out what is required to happen with this payload */ 1841 if (mgr->payloads[i].num_slots != req_payload.num_slots) { 1842 1843 /* need to push an update for this payload */ 1844 if (req_payload.num_slots) { 1845 drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload); 1846 mgr->payloads[i].num_slots = req_payload.num_slots; 1847 mgr->payloads[i].vcpi = req_payload.vcpi; 1848 } else if (mgr->payloads[i].num_slots) { 1849 mgr->payloads[i].num_slots = 0; 1850 drm_dp_destroy_payload_step1(mgr, port, mgr->payloads[i].vcpi, &mgr->payloads[i]); 1851 req_payload.payload_state = mgr->payloads[i].payload_state; 1852 mgr->payloads[i].start_slot = 0; 1853 } 1854 mgr->payloads[i].payload_state = req_payload.payload_state; 1855 } 1856 cur_slots += req_payload.num_slots; 1857 1858 if (port) 1859 drm_dp_put_port(port); 1860 } 1861 1862 for (i = 0; i < mgr->max_payloads; i++) { 1863 if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { 1864 DRM_DEBUG_KMS("removing payload %d\n", i); 1865 for (j = i; j < mgr->max_payloads - 1; j++) { 1866 memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload)); 1867 mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; 1868 if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) { 1869 set_bit(j + 1, &mgr->payload_mask); 1870 } else { 1871 clear_bit(j + 1, &mgr->payload_mask); 1872 } 1873 } 1874 memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload)); 1875 mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; 1876 clear_bit(mgr->max_payloads, &mgr->payload_mask); 1877 1878 } 1879 } 1880 mutex_unlock(&mgr->payload_lock); 1881 1882 return 0; 1883 } 1884 EXPORT_SYMBOL(drm_dp_update_payload_part1); 1885 1886 /** 1887 * drm_dp_update_payload_part2() - Execute payload update part 2 1888 * @mgr: manager to use. 1889 * 1890 * This iterates over all proposed virtual channels, and tries to 1891 * allocate space in the link for them. For 0->slots transitions, 1892 * this step writes the remote VC payload commands. For slots->0 1893 * this just resets some internal state. 1894 */ 1895 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) 1896 { 1897 struct drm_dp_mst_port *port; 1898 int i; 1899 int ret = 0; 1900 mutex_lock(&mgr->payload_lock); 1901 for (i = 0; i < mgr->max_payloads; i++) { 1902 1903 if (!mgr->proposed_vcpis[i]) 1904 continue; 1905 1906 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); 1907 1908 DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); 1909 if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { 1910 ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); 1911 } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { 1912 ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); 1913 } 1914 if (ret) { 1915 mutex_unlock(&mgr->payload_lock); 1916 return ret; 1917 } 1918 } 1919 mutex_unlock(&mgr->payload_lock); 1920 return 0; 1921 } 1922 EXPORT_SYMBOL(drm_dp_update_payload_part2); 1923 1924 #if 0 /* unused as of yet */ 1925 static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, 1926 struct drm_dp_mst_port *port, 1927 int offset, int size) 1928 { 1929 int len; 1930 struct drm_dp_sideband_msg_tx *txmsg; 1931 1932 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1933 if (!txmsg) 1934 return -ENOMEM; 1935 1936 len = build_dpcd_read(txmsg, port->port_num, 0, 8); 1937 txmsg->dst = port->parent; 1938 1939 drm_dp_queue_down_tx(mgr, txmsg); 1940 1941 return 0; 1942 } 1943 #endif 1944 1945 static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, 1946 struct drm_dp_mst_port *port, 1947 int offset, int size, u8 *bytes) 1948 { 1949 int len __unused; 1950 int ret; 1951 struct drm_dp_sideband_msg_tx *txmsg; 1952 struct drm_dp_mst_branch *mstb; 1953 1954 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); 1955 if (!mstb) 1956 return -EINVAL; 1957 1958 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1959 if (!txmsg) { 1960 ret = -ENOMEM; 1961 goto fail_put; 1962 } 1963 1964 len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); 1965 txmsg->dst = mstb; 1966 1967 drm_dp_queue_down_tx(mgr, txmsg); 1968 1969 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 1970 if (ret > 0) { 1971 if (txmsg->reply.reply_type == 1) { 1972 ret = -EINVAL; 1973 } else 1974 ret = 0; 1975 } 1976 kfree(txmsg); 1977 fail_put: 1978 drm_dp_put_mst_branch_device(mstb); 1979 return ret; 1980 } 1981 1982 static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) 1983 { 1984 struct drm_dp_sideband_msg_reply_body reply; 1985 1986 reply.reply_type = 1; 1987 reply.req_type = req_type; 1988 drm_dp_encode_sideband_reply(&reply, msg); 1989 return 0; 1990 } 1991 1992 static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, 1993 struct drm_dp_mst_branch *mstb, 1994 int req_type, int seqno, bool broadcast) 1995 { 1996 struct drm_dp_sideband_msg_tx *txmsg; 1997 1998 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 1999 if (!txmsg) 2000 return -ENOMEM; 2001 2002 txmsg->dst = mstb; 2003 txmsg->seqno = seqno; 2004 drm_dp_encode_up_ack_reply(txmsg, req_type); 2005 2006 mutex_lock(&mgr->qlock); 2007 2008 process_single_up_tx_qlock(mgr, txmsg); 2009 2010 mutex_unlock(&mgr->qlock); 2011 2012 kfree(txmsg); 2013 return 0; 2014 } 2015 2016 static bool drm_dp_get_vc_payload_bw(int dp_link_bw, 2017 int dp_link_count, 2018 int *out) 2019 { 2020 switch (dp_link_bw) { 2021 default: 2022 DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n", 2023 dp_link_bw, dp_link_count); 2024 return false; 2025 2026 case DP_LINK_BW_1_62: 2027 *out = 3 * dp_link_count; 2028 break; 2029 case DP_LINK_BW_2_7: 2030 *out = 5 * dp_link_count; 2031 break; 2032 case DP_LINK_BW_5_4: 2033 *out = 10 * dp_link_count; 2034 break; 2035 } 2036 return true; 2037 } 2038 2039 /** 2040 * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager 2041 * @mgr: manager to set state for 2042 * @mst_state: true to enable MST on this connector - false to disable. 2043 * 2044 * This is called by the driver when it detects an MST capable device plugged 2045 * into a DP MST capable port, or when a DP MST capable device is unplugged. 2046 */ 2047 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) 2048 { 2049 int ret = 0; 2050 struct drm_dp_mst_branch *mstb = NULL; 2051 2052 mutex_lock(&mgr->lock); 2053 if (mst_state == mgr->mst_state) 2054 goto out_unlock; 2055 2056 mgr->mst_state = mst_state; 2057 /* set the device into MST mode */ 2058 if (mst_state) { 2059 WARN_ON(mgr->mst_primary); 2060 2061 /* get dpcd info */ 2062 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); 2063 if (ret != DP_RECEIVER_CAP_SIZE) { 2064 DRM_DEBUG_KMS("failed to read DPCD\n"); 2065 goto out_unlock; 2066 } 2067 2068 if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1], 2069 mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, 2070 &mgr->pbn_div)) { 2071 ret = -EINVAL; 2072 goto out_unlock; 2073 } 2074 2075 mgr->total_pbn = 2560; 2076 mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div); 2077 mgr->avail_slots = mgr->total_slots; 2078 2079 /* add initial branch device at LCT 1 */ 2080 mstb = drm_dp_add_mst_branch_device(1, NULL); 2081 if (mstb == NULL) { 2082 ret = -ENOMEM; 2083 goto out_unlock; 2084 } 2085 mstb->mgr = mgr; 2086 2087 /* give this the main reference */ 2088 mgr->mst_primary = mstb; 2089 kref_get(&mgr->mst_primary->kref); 2090 2091 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 2092 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); 2093 if (ret < 0) { 2094 goto out_unlock; 2095 } 2096 2097 { 2098 struct drm_dp_payload reset_pay; 2099 reset_pay.start_slot = 0; 2100 reset_pay.num_slots = 0x3f; 2101 drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); 2102 } 2103 2104 queue_work(system_long_wq, &mgr->work); 2105 2106 ret = 0; 2107 } else { 2108 /* disable MST on the device */ 2109 mstb = mgr->mst_primary; 2110 mgr->mst_primary = NULL; 2111 /* this can fail if the device is gone */ 2112 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); 2113 ret = 0; 2114 memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); 2115 mgr->payload_mask = 0; 2116 set_bit(0, &mgr->payload_mask); 2117 mgr->vcpi_mask = 0; 2118 } 2119 2120 out_unlock: 2121 mutex_unlock(&mgr->lock); 2122 if (mstb) 2123 drm_dp_put_mst_branch_device(mstb); 2124 return ret; 2125 2126 } 2127 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); 2128 2129 /** 2130 * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager 2131 * @mgr: manager to suspend 2132 * 2133 * This function tells the MST device that we can't handle UP messages 2134 * anymore. This should stop it from sending any since we are suspended. 2135 */ 2136 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) 2137 { 2138 mutex_lock(&mgr->lock); 2139 drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 2140 DP_MST_EN | DP_UPSTREAM_IS_SRC); 2141 mutex_unlock(&mgr->lock); 2142 flush_work(&mgr->work); 2143 flush_work(&mgr->destroy_connector_work); 2144 } 2145 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); 2146 2147 /** 2148 * drm_dp_mst_topology_mgr_resume() - resume the MST manager 2149 * @mgr: manager to resume 2150 * 2151 * This will fetch DPCD and see if the device is still there, 2152 * if it is, it will rewrite the MSTM control bits, and return. 2153 * 2154 * if the device fails this returns -1, and the driver should do 2155 * a full MST reprobe, in case we were undocked. 2156 */ 2157 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) 2158 { 2159 int ret = 0; 2160 2161 mutex_lock(&mgr->lock); 2162 2163 if (mgr->mst_primary) { 2164 int sret; 2165 u8 guid[16]; 2166 2167 sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); 2168 if (sret != DP_RECEIVER_CAP_SIZE) { 2169 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); 2170 ret = -1; 2171 goto out_unlock; 2172 } 2173 2174 ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 2175 DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); 2176 if (ret < 0) { 2177 DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); 2178 ret = -1; 2179 goto out_unlock; 2180 } 2181 2182 /* Some hubs forget their guids after they resume */ 2183 sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); 2184 if (sret != 16) { 2185 DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); 2186 ret = -1; 2187 goto out_unlock; 2188 } 2189 drm_dp_check_mstb_guid(mgr->mst_primary, guid); 2190 2191 ret = 0; 2192 } else 2193 ret = -1; 2194 2195 out_unlock: 2196 mutex_unlock(&mgr->lock); 2197 return ret; 2198 } 2199 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); 2200 2201 static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) 2202 { 2203 int len; 2204 u8 replyblock[32]; 2205 int replylen, origlen __unused, curreply; 2206 int ret; 2207 struct drm_dp_sideband_msg_rx *msg; 2208 int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; 2209 msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; 2210 2211 len = min(mgr->max_dpcd_transaction_bytes, 16); 2212 ret = drm_dp_dpcd_read(mgr->aux, basereg, 2213 replyblock, len); 2214 if (ret != len) { 2215 DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); 2216 return false; 2217 } 2218 ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); 2219 if (!ret) { 2220 DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); 2221 return false; 2222 } 2223 replylen = msg->curchunk_len + msg->curchunk_hdrlen; 2224 2225 origlen = replylen; 2226 replylen -= len; 2227 curreply = len; 2228 while (replylen > 0) { 2229 len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); 2230 ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, 2231 replyblock, len); 2232 if (ret != len) { 2233 DRM_DEBUG_KMS("failed to read a chunk (len %d, ret %d)\n", 2234 len, ret); 2235 return false; 2236 } 2237 2238 ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); 2239 if (!ret) { 2240 DRM_DEBUG_KMS("failed to build sideband msg\n"); 2241 return false; 2242 } 2243 2244 curreply += len; 2245 replylen -= len; 2246 } 2247 return true; 2248 } 2249 2250 static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) 2251 { 2252 int ret = 0; 2253 2254 if (!drm_dp_get_one_sb_msg(mgr, false)) { 2255 memset(&mgr->down_rep_recv, 0, 2256 sizeof(struct drm_dp_sideband_msg_rx)); 2257 return 0; 2258 } 2259 2260 if (mgr->down_rep_recv.have_eomt) { 2261 struct drm_dp_sideband_msg_tx *txmsg; 2262 struct drm_dp_mst_branch *mstb; 2263 int slot = -1; 2264 mstb = drm_dp_get_mst_branch_device(mgr, 2265 mgr->down_rep_recv.initial_hdr.lct, 2266 mgr->down_rep_recv.initial_hdr.rad); 2267 2268 if (!mstb) { 2269 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); 2270 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2271 return 0; 2272 } 2273 2274 /* find the message */ 2275 slot = mgr->down_rep_recv.initial_hdr.seqno; 2276 mutex_lock(&mgr->qlock); 2277 txmsg = mstb->tx_slots[slot]; 2278 /* remove from slots */ 2279 mutex_unlock(&mgr->qlock); 2280 2281 if (!txmsg) { 2282 DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", 2283 mstb, 2284 mgr->down_rep_recv.initial_hdr.seqno, 2285 mgr->down_rep_recv.initial_hdr.lct, 2286 mgr->down_rep_recv.initial_hdr.rad[0], 2287 mgr->down_rep_recv.msg[0]); 2288 drm_dp_put_mst_branch_device(mstb); 2289 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2290 return 0; 2291 } 2292 2293 drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); 2294 if (txmsg->reply.reply_type == 1) { 2295 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); 2296 } 2297 2298 memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2299 drm_dp_put_mst_branch_device(mstb); 2300 2301 mutex_lock(&mgr->qlock); 2302 txmsg->state = DRM_DP_SIDEBAND_TX_RX; 2303 mstb->tx_slots[slot] = NULL; 2304 #ifdef __NetBSD__ 2305 DRM_WAKEUP_ONE(&mstb->mgr->tx_waitq, &mstb->mgr->qlock); 2306 mutex_unlock(&mgr->qlock); 2307 #else 2308 mutex_unlock(&mgr->qlock); 2309 2310 wake_up(&mgr->tx_waitq); 2311 #endif 2312 } 2313 return ret; 2314 } 2315 2316 static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) 2317 { 2318 int ret = 0; 2319 2320 if (!drm_dp_get_one_sb_msg(mgr, true)) { 2321 memset(&mgr->up_req_recv, 0, 2322 sizeof(struct drm_dp_sideband_msg_rx)); 2323 return 0; 2324 } 2325 2326 if (mgr->up_req_recv.have_eomt) { 2327 struct drm_dp_sideband_msg_req_body msg; 2328 struct drm_dp_mst_branch *mstb = NULL; 2329 bool seqno; 2330 2331 if (!mgr->up_req_recv.initial_hdr.broadcast) { 2332 mstb = drm_dp_get_mst_branch_device(mgr, 2333 mgr->up_req_recv.initial_hdr.lct, 2334 mgr->up_req_recv.initial_hdr.rad); 2335 if (!mstb) { 2336 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); 2337 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2338 return 0; 2339 } 2340 } 2341 2342 seqno = mgr->up_req_recv.initial_hdr.seqno; 2343 drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); 2344 2345 if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { 2346 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); 2347 2348 if (!mstb) 2349 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid); 2350 2351 if (!mstb) { 2352 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); 2353 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2354 return 0; 2355 } 2356 2357 drm_dp_update_port(mstb, &msg.u.conn_stat); 2358 2359 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); 2360 (*mgr->cbs->hotplug)(mgr); 2361 2362 } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { 2363 drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); 2364 if (!mstb) 2365 mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid); 2366 2367 if (!mstb) { 2368 DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); 2369 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2370 return 0; 2371 } 2372 2373 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); 2374 } 2375 2376 if (mstb) 2377 drm_dp_put_mst_branch_device(mstb); 2378 2379 memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); 2380 } 2381 return ret; 2382 } 2383 2384 /** 2385 * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify 2386 * @mgr: manager to notify irq for. 2387 * @esi: 4 bytes from SINK_COUNT_ESI 2388 * @handled: whether the hpd interrupt was consumed or not 2389 * 2390 * This should be called from the driver when it detects a short IRQ, 2391 * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The 2392 * topology manager will process the sideband messages received as a result 2393 * of this. 2394 */ 2395 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) 2396 { 2397 int ret = 0; 2398 int sc; 2399 *handled = false; 2400 sc = esi[0] & 0x3f; 2401 2402 if (sc != mgr->sink_count) { 2403 mgr->sink_count = sc; 2404 *handled = true; 2405 } 2406 2407 if (esi[1] & DP_DOWN_REP_MSG_RDY) { 2408 ret = drm_dp_mst_handle_down_rep(mgr); 2409 *handled = true; 2410 } 2411 2412 if (esi[1] & DP_UP_REQ_MSG_RDY) { 2413 ret |= drm_dp_mst_handle_up_req(mgr); 2414 *handled = true; 2415 } 2416 2417 drm_dp_mst_kick_tx(mgr); 2418 return ret; 2419 } 2420 EXPORT_SYMBOL(drm_dp_mst_hpd_irq); 2421 2422 /** 2423 * drm_dp_mst_detect_port() - get connection status for an MST port 2424 * @mgr: manager for this port 2425 * @port: unverified pointer to a port 2426 * 2427 * This returns the current connection state for a port. It validates the 2428 * port pointer still exists so the caller doesn't require a reference 2429 */ 2430 enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, 2431 struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2432 { 2433 enum drm_connector_status status = connector_status_disconnected; 2434 2435 /* we need to search for the port in the mgr in case its gone */ 2436 port = drm_dp_get_validated_port_ref(mgr, port); 2437 if (!port) 2438 return connector_status_disconnected; 2439 2440 if (!port->ddps) 2441 goto out; 2442 2443 switch (port->pdt) { 2444 case DP_PEER_DEVICE_NONE: 2445 case DP_PEER_DEVICE_MST_BRANCHING: 2446 break; 2447 2448 case DP_PEER_DEVICE_SST_SINK: 2449 status = connector_status_connected; 2450 /* for logical ports - cache the EDID */ 2451 if (port->port_num >= 8 && !port->cached_edid) { 2452 port->cached_edid = drm_get_edid(connector, &port->aux.ddc); 2453 } 2454 break; 2455 case DP_PEER_DEVICE_DP_LEGACY_CONV: 2456 if (port->ldps) 2457 status = connector_status_connected; 2458 break; 2459 } 2460 out: 2461 drm_dp_put_port(port); 2462 return status; 2463 } 2464 EXPORT_SYMBOL(drm_dp_mst_detect_port); 2465 2466 /** 2467 * drm_dp_mst_get_edid() - get EDID for an MST port 2468 * @connector: toplevel connector to get EDID for 2469 * @mgr: manager for this port 2470 * @port: unverified pointer to a port. 2471 * 2472 * This returns an EDID for the port connected to a connector, 2473 * It validates the pointer still exists so the caller doesn't require a 2474 * reference. 2475 */ 2476 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2477 { 2478 struct edid *edid = NULL; 2479 2480 /* we need to search for the port in the mgr in case its gone */ 2481 port = drm_dp_get_validated_port_ref(mgr, port); 2482 if (!port) 2483 return NULL; 2484 2485 if (port->cached_edid) 2486 edid = drm_edid_duplicate(port->cached_edid); 2487 else { 2488 edid = drm_get_edid(connector, &port->aux.ddc); 2489 drm_mode_connector_set_tile_property(connector); 2490 } 2491 drm_dp_put_port(port); 2492 return edid; 2493 } 2494 EXPORT_SYMBOL(drm_dp_mst_get_edid); 2495 2496 /** 2497 * drm_dp_find_vcpi_slots() - find slots for this PBN value 2498 * @mgr: manager to use 2499 * @pbn: payload bandwidth to convert into slots. 2500 */ 2501 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, 2502 int pbn) 2503 { 2504 int num_slots; 2505 2506 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); 2507 2508 if (num_slots > mgr->avail_slots) 2509 return -ENOSPC; 2510 return num_slots; 2511 } 2512 EXPORT_SYMBOL(drm_dp_find_vcpi_slots); 2513 2514 static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, 2515 struct drm_dp_vcpi *vcpi, int pbn) 2516 { 2517 int num_slots; 2518 int ret; 2519 2520 num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); 2521 2522 if (num_slots > mgr->avail_slots) 2523 return -ENOSPC; 2524 2525 vcpi->pbn = pbn; 2526 vcpi->aligned_pbn = num_slots * mgr->pbn_div; 2527 vcpi->num_slots = num_slots; 2528 2529 ret = drm_dp_mst_assign_payload_id(mgr, vcpi); 2530 if (ret < 0) 2531 return ret; 2532 return 0; 2533 } 2534 2535 /** 2536 * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel 2537 * @mgr: manager for this port 2538 * @port: port to allocate a virtual channel for. 2539 * @pbn: payload bandwidth number to request 2540 * @slots: returned number of slots for this PBN. 2541 */ 2542 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots) 2543 { 2544 int ret; 2545 2546 port = drm_dp_get_validated_port_ref(mgr, port); 2547 if (!port) 2548 return false; 2549 2550 if (port->vcpi.vcpi > 0) { 2551 DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); 2552 if (pbn == port->vcpi.pbn) { 2553 *slots = port->vcpi.num_slots; 2554 drm_dp_put_port(port); 2555 return true; 2556 } 2557 } 2558 2559 ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn); 2560 if (ret) { 2561 DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret); 2562 goto out; 2563 } 2564 DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); 2565 *slots = port->vcpi.num_slots; 2566 2567 drm_dp_put_port(port); 2568 return true; 2569 out: 2570 return false; 2571 } 2572 EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); 2573 2574 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2575 { 2576 int slots = 0; 2577 port = drm_dp_get_validated_port_ref(mgr, port); 2578 if (!port) 2579 return slots; 2580 2581 slots = port->vcpi.num_slots; 2582 drm_dp_put_port(port); 2583 return slots; 2584 } 2585 EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots); 2586 2587 /** 2588 * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI 2589 * @mgr: manager for this port 2590 * @port: unverified pointer to a port. 2591 * 2592 * This just resets the number of slots for the ports VCPI for later programming. 2593 */ 2594 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2595 { 2596 port = drm_dp_get_validated_port_ref(mgr, port); 2597 if (!port) 2598 return; 2599 port->vcpi.num_slots = 0; 2600 drm_dp_put_port(port); 2601 } 2602 EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); 2603 2604 /** 2605 * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI 2606 * @mgr: manager for this port 2607 * @port: unverified port to deallocate vcpi for 2608 */ 2609 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) 2610 { 2611 port = drm_dp_get_validated_port_ref(mgr, port); 2612 if (!port) 2613 return; 2614 2615 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); 2616 port->vcpi.num_slots = 0; 2617 port->vcpi.pbn = 0; 2618 port->vcpi.aligned_pbn = 0; 2619 port->vcpi.vcpi = 0; 2620 drm_dp_put_port(port); 2621 } 2622 EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); 2623 2624 static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, 2625 int id, struct drm_dp_payload *payload) 2626 { 2627 u8 payload_alloc[3], status; 2628 int ret; 2629 int retries = 0; 2630 2631 drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, 2632 DP_PAYLOAD_TABLE_UPDATED); 2633 2634 payload_alloc[0] = id; 2635 payload_alloc[1] = payload->start_slot; 2636 payload_alloc[2] = payload->num_slots; 2637 2638 ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); 2639 if (ret != 3) { 2640 DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); 2641 goto fail; 2642 } 2643 2644 retry: 2645 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); 2646 if (ret < 0) { 2647 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); 2648 goto fail; 2649 } 2650 2651 if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { 2652 retries++; 2653 if (retries < 20) { 2654 usleep_range(10000, 20000); 2655 goto retry; 2656 } 2657 DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); 2658 ret = -EINVAL; 2659 goto fail; 2660 } 2661 ret = 0; 2662 fail: 2663 return ret; 2664 } 2665 2666 2667 /** 2668 * drm_dp_check_act_status() - Check ACT handled status. 2669 * @mgr: manager to use 2670 * 2671 * Check the payload status bits in the DPCD for ACT handled completion. 2672 */ 2673 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) 2674 { 2675 u8 status; 2676 int ret; 2677 int count = 0; 2678 2679 do { 2680 ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); 2681 2682 if (ret < 0) { 2683 DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); 2684 goto fail; 2685 } 2686 2687 if (status & DP_PAYLOAD_ACT_HANDLED) 2688 break; 2689 count++; 2690 udelay(100); 2691 2692 } while (count < 30); 2693 2694 if (!(status & DP_PAYLOAD_ACT_HANDLED)) { 2695 DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); 2696 ret = -EINVAL; 2697 goto fail; 2698 } 2699 return 0; 2700 fail: 2701 return ret; 2702 } 2703 EXPORT_SYMBOL(drm_dp_check_act_status); 2704 2705 /** 2706 * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. 2707 * @clock: dot clock for the mode 2708 * @bpp: bpp for the mode. 2709 * 2710 * This uses the formula in the spec to calculate the PBN value for a mode. 2711 */ 2712 int drm_dp_calc_pbn_mode(int clock, int bpp) 2713 { 2714 u64 kbps; 2715 s64 peak_kbps; 2716 u32 numerator; 2717 u32 denominator; 2718 2719 kbps = clock * bpp; 2720 2721 /* 2722 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006 2723 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on 2724 * common multiplier to render an integer PBN for all link rate/lane 2725 * counts combinations 2726 * calculate 2727 * peak_kbps *= (1006/1000) 2728 * peak_kbps *= (64/54) 2729 * peak_kbps *= 8 convert to bytes 2730 */ 2731 2732 numerator = 64 * 1006; 2733 denominator = 54 * 8 * 1000 * 1000; 2734 2735 kbps *= numerator; 2736 peak_kbps = drm_fixp_from_fraction(kbps, denominator); 2737 2738 return drm_fixp2int_ceil(peak_kbps); 2739 } 2740 EXPORT_SYMBOL(drm_dp_calc_pbn_mode); 2741 2742 static int test_calc_pbn_mode(void) 2743 { 2744 int ret; 2745 ret = drm_dp_calc_pbn_mode(154000, 30); 2746 if (ret != 689) { 2747 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", 2748 154000, 30, 689, ret); 2749 return -EINVAL; 2750 } 2751 ret = drm_dp_calc_pbn_mode(234000, 30); 2752 if (ret != 1047) { 2753 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", 2754 234000, 30, 1047, ret); 2755 return -EINVAL; 2756 } 2757 ret = drm_dp_calc_pbn_mode(297000, 24); 2758 if (ret != 1063) { 2759 DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", 2760 297000, 24, 1063, ret); 2761 return -EINVAL; 2762 } 2763 return 0; 2764 } 2765 2766 /* we want to kick the TX after we've ack the up/down IRQs. */ 2767 static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) 2768 { 2769 queue_work(system_long_wq, &mgr->tx_work); 2770 } 2771 2772 #if IS_ENABLED(CONFIG_DEBUG_FS) 2773 static void drm_dp_mst_dump_mstb(struct seq_file *m, 2774 struct drm_dp_mst_branch *mstb) 2775 { 2776 struct drm_dp_mst_port *port; 2777 int tabs = mstb->lct; 2778 char prefix[10]; 2779 int i; 2780 2781 for (i = 0; i < tabs; i++) 2782 prefix[i] = '\t'; 2783 prefix[i] = '\0'; 2784 2785 seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); 2786 list_for_each_entry(port, &mstb->ports, next) { 2787 seq_printf(m, "%sport: %d: ddps: %d ldps: %d, %p, conn: %p\n", prefix, port->port_num, port->ddps, port->ldps, port, port->connector); 2788 if (port->mstb) 2789 drm_dp_mst_dump_mstb(m, port->mstb); 2790 } 2791 } 2792 2793 static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, 2794 char *buf) 2795 { 2796 int ret; 2797 int i; 2798 for (i = 0; i < 4; i++) { 2799 ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16); 2800 if (ret != 16) 2801 break; 2802 } 2803 if (i == 4) 2804 return true; 2805 return false; 2806 } 2807 2808 /** 2809 * drm_dp_mst_dump_topology(): dump topology to seq file. 2810 * @m: seq_file to dump output to 2811 * @mgr: manager to dump current topology for. 2812 * 2813 * helper to dump MST topology to a seq file for debugfs. 2814 */ 2815 void drm_dp_mst_dump_topology(struct seq_file *m, 2816 struct drm_dp_mst_topology_mgr *mgr) 2817 { 2818 int i; 2819 struct drm_dp_mst_port *port; 2820 mutex_lock(&mgr->lock); 2821 if (mgr->mst_primary) 2822 drm_dp_mst_dump_mstb(m, mgr->mst_primary); 2823 2824 /* dump VCPIs */ 2825 mutex_unlock(&mgr->lock); 2826 2827 mutex_lock(&mgr->payload_lock); 2828 seq_printf(m, "vcpi: %lx %lx\n", mgr->payload_mask, mgr->vcpi_mask); 2829 2830 for (i = 0; i < mgr->max_payloads; i++) { 2831 if (mgr->proposed_vcpis[i]) { 2832 port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); 2833 seq_printf(m, "vcpi %d: %d %d %d\n", i, port->port_num, port->vcpi.vcpi, port->vcpi.num_slots); 2834 } else 2835 seq_printf(m, "vcpi %d:unsed\n", i); 2836 } 2837 for (i = 0; i < mgr->max_payloads; i++) { 2838 seq_printf(m, "payload %d: %d, %d, %d\n", 2839 i, 2840 mgr->payloads[i].payload_state, 2841 mgr->payloads[i].start_slot, 2842 mgr->payloads[i].num_slots); 2843 2844 2845 } 2846 mutex_unlock(&mgr->payload_lock); 2847 2848 mutex_lock(&mgr->lock); 2849 if (mgr->mst_primary) { 2850 u8 buf[64]; 2851 bool bret; 2852 int ret; 2853 ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); 2854 seq_printf(m, "dpcd: "); 2855 for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++) 2856 seq_printf(m, "%02x ", buf[i]); 2857 seq_printf(m, "\n"); 2858 ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); 2859 seq_printf(m, "faux/mst: "); 2860 for (i = 0; i < 2; i++) 2861 seq_printf(m, "%02x ", buf[i]); 2862 seq_printf(m, "\n"); 2863 ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); 2864 seq_printf(m, "mst ctrl: "); 2865 for (i = 0; i < 1; i++) 2866 seq_printf(m, "%02x ", buf[i]); 2867 seq_printf(m, "\n"); 2868 2869 /* dump the standard OUI branch header */ 2870 ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); 2871 seq_printf(m, "branch oui: "); 2872 for (i = 0; i < 0x3; i++) 2873 seq_printf(m, "%02x", buf[i]); 2874 seq_printf(m, " devid: "); 2875 for (i = 0x3; i < 0x8; i++) 2876 seq_printf(m, "%c", buf[i]); 2877 seq_printf(m, " revision: hw: %x.%x sw: %x.%x", buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]); 2878 seq_printf(m, "\n"); 2879 bret = dump_dp_payload_table(mgr, buf); 2880 if (bret == true) { 2881 seq_printf(m, "payload table: "); 2882 for (i = 0; i < 63; i++) 2883 seq_printf(m, "%02x ", buf[i]); 2884 seq_printf(m, "\n"); 2885 } 2886 2887 } 2888 2889 mutex_unlock(&mgr->lock); 2890 2891 } 2892 EXPORT_SYMBOL(drm_dp_mst_dump_topology); 2893 #endif /* IS_ENABLED(CONFIG_DEBUG_FS) */ 2894 2895 static void drm_dp_tx_work(struct work_struct *work) 2896 { 2897 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); 2898 2899 mutex_lock(&mgr->qlock); 2900 if (mgr->tx_down_in_progress) 2901 process_single_down_tx_qlock(mgr); 2902 mutex_unlock(&mgr->qlock); 2903 } 2904 2905 static void drm_dp_free_mst_port(struct kref *kref) 2906 { 2907 struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); 2908 kref_put(&port->parent->kref, drm_dp_free_mst_branch_device); 2909 kfree(port); 2910 } 2911 2912 static void drm_dp_destroy_connector_work(struct work_struct *work) 2913 { 2914 struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work); 2915 struct drm_dp_mst_port *port; 2916 bool send_hotplug = false; 2917 /* 2918 * Not a regular list traverse as we have to drop the destroy 2919 * connector lock before destroying the connector, to avoid AB->BA 2920 * ordering between this lock and the config mutex. 2921 */ 2922 for (;;) { 2923 mutex_lock(&mgr->destroy_connector_lock); 2924 port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next); 2925 if (!port) { 2926 mutex_unlock(&mgr->destroy_connector_lock); 2927 break; 2928 } 2929 list_del(&port->next); 2930 mutex_unlock(&mgr->destroy_connector_lock); 2931 2932 kref_init(&port->kref); 2933 INIT_LIST_HEAD(&port->next); 2934 2935 mgr->cbs->destroy_connector(mgr, port->connector); 2936 2937 drm_dp_port_teardown_pdt(port, port->pdt); 2938 port->pdt = DP_PEER_DEVICE_NONE; 2939 2940 if (!port->input && port->vcpi.vcpi > 0) { 2941 drm_dp_mst_reset_vcpi_slots(mgr, port); 2942 drm_dp_update_payload_part1(mgr); 2943 drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); 2944 } 2945 2946 kref_put(&port->kref, drm_dp_free_mst_port); 2947 send_hotplug = true; 2948 } 2949 if (send_hotplug) 2950 (*mgr->cbs->hotplug)(mgr); 2951 } 2952 2953 /** 2954 * drm_dp_mst_topology_mgr_init - initialise a topology manager 2955 * @mgr: manager struct to initialise 2956 * @dev: device providing this structure - for i2c addition. 2957 * @aux: DP helper aux channel to talk to this device 2958 * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit 2959 * @max_payloads: maximum number of payloads this GPU can source 2960 * @conn_base_id: the connector object ID the MST device is connected to. 2961 * 2962 * Return 0 for success, or negative error code on failure 2963 */ 2964 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, 2965 struct device *dev, struct drm_dp_aux *aux, 2966 int max_dpcd_transaction_bytes, 2967 int max_payloads, int conn_base_id) 2968 { 2969 #ifdef __NetBSD__ 2970 linux_mutex_init(&mgr->lock); 2971 linux_mutex_init(&mgr->qlock); 2972 linux_mutex_init(&mgr->payload_lock); 2973 linux_mutex_init(&mgr->destroy_connector_lock); 2974 #else 2975 mutex_init(&mgr->lock); 2976 mutex_init(&mgr->qlock); 2977 mutex_init(&mgr->payload_lock); 2978 mutex_init(&mgr->destroy_connector_lock); 2979 #endif 2980 INIT_LIST_HEAD(&mgr->tx_msg_downq); 2981 INIT_LIST_HEAD(&mgr->destroy_connector_list); 2982 INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); 2983 INIT_WORK(&mgr->tx_work, drm_dp_tx_work); 2984 INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work); 2985 #ifdef __NetBSD__ 2986 DRM_INIT_WAITQUEUE(&mgr->tx_waitq, "dpmstwait"); 2987 #else 2988 init_waitqueue_head(&mgr->tx_waitq); 2989 #endif 2990 mgr->dev = dev; 2991 mgr->aux = aux; 2992 mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; 2993 mgr->max_payloads = max_payloads; 2994 mgr->conn_base_id = conn_base_id; 2995 mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); 2996 if (!mgr->payloads) 2997 return -ENOMEM; 2998 mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); 2999 if (!mgr->proposed_vcpis) 3000 return -ENOMEM; 3001 set_bit(0, &mgr->payload_mask); 3002 test_calc_pbn_mode(); 3003 return 0; 3004 } 3005 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); 3006 3007 /** 3008 * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. 3009 * @mgr: manager to destroy 3010 */ 3011 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) 3012 { 3013 flush_work(&mgr->work); 3014 flush_work(&mgr->destroy_connector_work); 3015 mutex_lock(&mgr->payload_lock); 3016 kfree(mgr->payloads); 3017 mgr->payloads = NULL; 3018 kfree(mgr->proposed_vcpis); 3019 mgr->proposed_vcpis = NULL; 3020 mutex_unlock(&mgr->payload_lock); 3021 mgr->dev = NULL; 3022 mgr->aux = NULL; 3023 #ifdef __NetBSD__ 3024 DRM_DESTROY_WAITQUEUE(&mgr->tx_waitq); 3025 linux_mutex_destroy(&mgr->destroy_connector_lock); 3026 linux_mutex_destroy(&mgr->payload_lock); 3027 linux_mutex_destroy(&mgr->qlock); 3028 linux_mutex_destroy(&mgr->lock); 3029 #else 3030 mutex_destroy(&mgr->destroy_connector_lock); 3031 mutex_destroy(&mgr->payload_lock); 3032 mutex_destroy(&mgr->qlock); 3033 mutex_destroy(&mgr->lock); 3034 #endif 3035 } 3036 EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); 3037 3038 /* I2C device */ 3039 static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, 3040 int num) 3041 { 3042 struct drm_dp_aux *aux = adapter->algo_data; 3043 struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); 3044 struct drm_dp_mst_branch *mstb; 3045 struct drm_dp_mst_topology_mgr *mgr = port->mgr; 3046 unsigned int i; 3047 bool reading = false; 3048 struct drm_dp_sideband_msg_req_body msg; 3049 struct drm_dp_sideband_msg_tx *txmsg = NULL; 3050 int ret; 3051 3052 mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); 3053 if (!mstb) 3054 return -EREMOTEIO; 3055 3056 /* construct i2c msg */ 3057 /* see if last msg is a read */ 3058 if (msgs[num - 1].flags & I2C_M_RD) 3059 reading = true; 3060 3061 if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) { 3062 DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); 3063 ret = -EIO; 3064 goto out; 3065 } 3066 3067 memset(&msg, 0, sizeof(msg)); 3068 msg.req_type = DP_REMOTE_I2C_READ; 3069 msg.u.i2c_read.num_transactions = num - 1; 3070 msg.u.i2c_read.port_number = port->port_num; 3071 for (i = 0; i < num - 1; i++) { 3072 msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; 3073 msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; 3074 msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; 3075 } 3076 msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; 3077 msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; 3078 3079 txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); 3080 if (!txmsg) { 3081 ret = -ENOMEM; 3082 goto out; 3083 } 3084 3085 txmsg->dst = mstb; 3086 drm_dp_encode_sideband_req(&msg, txmsg); 3087 3088 drm_dp_queue_down_tx(mgr, txmsg); 3089 3090 ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); 3091 if (ret > 0) { 3092 3093 if (txmsg->reply.reply_type == 1) { /* got a NAK back */ 3094 ret = -EREMOTEIO; 3095 goto out; 3096 } 3097 if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { 3098 ret = -EIO; 3099 goto out; 3100 } 3101 memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); 3102 ret = num; 3103 } 3104 out: 3105 kfree(txmsg); 3106 drm_dp_put_mst_branch_device(mstb); 3107 return ret; 3108 } 3109 3110 static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) 3111 { 3112 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | 3113 I2C_FUNC_SMBUS_READ_BLOCK_DATA | 3114 I2C_FUNC_SMBUS_BLOCK_PROC_CALL | 3115 I2C_FUNC_10BIT_ADDR; 3116 } 3117 3118 static const struct i2c_algorithm drm_dp_mst_i2c_algo = { 3119 .functionality = drm_dp_mst_i2c_functionality, 3120 .master_xfer = drm_dp_mst_i2c_xfer, 3121 }; 3122 3123 /** 3124 * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX 3125 * @aux: DisplayPort AUX channel 3126 * 3127 * Returns 0 on success or a negative error code on failure. 3128 */ 3129 static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) 3130 { 3131 aux->ddc.algo = &drm_dp_mst_i2c_algo; 3132 aux->ddc.algo_data = aux; 3133 aux->ddc.retries = 3; 3134 3135 aux->ddc.class = I2C_CLASS_DDC; 3136 aux->ddc.owner = THIS_MODULE; 3137 aux->ddc.dev.parent = aux->dev; 3138 #ifndef __NetBSD__ /* XXX of? */ 3139 aux->ddc.dev.of_node = aux->dev->of_node; 3140 #endif 3141 3142 strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), 3143 sizeof(aux->ddc.name)); 3144 3145 return i2c_add_adapter(&aux->ddc); 3146 } 3147 3148 /** 3149 * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter 3150 * @aux: DisplayPort AUX channel 3151 */ 3152 static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) 3153 { 3154 i2c_del_adapter(&aux->ddc); 3155 } 3156
Indexes created Wed Oct 01 18:09:54 GMT 2025