Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright © 2014 Red Hat |
| 3 | * |
| 4 | * Permission to use, copy, modify, distribute, and sell this software and its |
| 5 | * documentation for any purpose is hereby granted without fee, provided that |
| 6 | * the above copyright notice appear in all copies and that both that copyright |
| 7 | * notice and this permission notice appear in supporting documentation, and |
| 8 | * that the name of the copyright holders not be used in advertising or |
| 9 | * publicity pertaining to distribution of the software without specific, |
| 10 | * written prior permission. The copyright holders make no representations |
| 11 | * about the suitability of this software for any purpose. It is provided "as |
| 12 | * is" without express or implied warranty. |
| 13 | * |
| 14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| 15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| 16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| 17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
| 18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| 20 | * OF THIS SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/errno.h> |
| 27 | #include <linux/sched.h> |
Dave Airlie | 75bc08a | 2014-07-09 11:15:09 +1000 | [diff] [blame] | 28 | #include <linux/seq_file.h> |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 29 | #include <linux/i2c.h> |
| 30 | #include <drm/drm_dp_mst_helper.h> |
| 31 | #include <drm/drmP.h> |
| 32 | |
| 33 | #include <drm/drm_fixed.h> |
| 34 | |
| 35 | /** |
| 36 | * DOC: dp mst helper |
| 37 | * |
| 38 | * These functions contain parts of the DisplayPort 1.2a MultiStream Transport |
| 39 | * protocol. The helpers contain a topology manager and bandwidth manager. |
| 40 | * The helpers encapsulate the sending and received of sideband msgs. |
| 41 | */ |
| 42 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
| 43 | char *buf); |
| 44 | static int test_calc_pbn_mode(void); |
| 45 | |
| 46 | static void drm_dp_put_port(struct drm_dp_mst_port *port); |
| 47 | |
| 48 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, |
| 49 | int id, |
| 50 | struct drm_dp_payload *payload); |
| 51 | |
| 52 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
| 53 | struct drm_dp_mst_port *port, |
| 54 | int offset, int size, u8 *bytes); |
| 55 | |
Dave Airlie | 68d8c9f | 2015-09-06 18:53:00 +1000 | [diff] [blame] | 56 | static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
| 57 | struct drm_dp_mst_branch *mstb); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 58 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
| 59 | struct drm_dp_mst_branch *mstb, |
| 60 | struct drm_dp_mst_port *port); |
| 61 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, |
| 62 | u8 *guid); |
| 63 | |
| 64 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux); |
| 65 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux); |
| 66 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr); |
| 67 | /* sideband msg handling */ |
| 68 | static u8 drm_dp_msg_header_crc4(const uint8_t *data, size_t num_nibbles) |
| 69 | { |
| 70 | u8 bitmask = 0x80; |
| 71 | u8 bitshift = 7; |
| 72 | u8 array_index = 0; |
| 73 | int number_of_bits = num_nibbles * 4; |
| 74 | u8 remainder = 0; |
| 75 | |
| 76 | while (number_of_bits != 0) { |
| 77 | number_of_bits--; |
| 78 | remainder <<= 1; |
| 79 | remainder |= (data[array_index] & bitmask) >> bitshift; |
| 80 | bitmask >>= 1; |
| 81 | bitshift--; |
| 82 | if (bitmask == 0) { |
| 83 | bitmask = 0x80; |
| 84 | bitshift = 7; |
| 85 | array_index++; |
| 86 | } |
| 87 | if ((remainder & 0x10) == 0x10) |
| 88 | remainder ^= 0x13; |
| 89 | } |
| 90 | |
| 91 | number_of_bits = 4; |
| 92 | while (number_of_bits != 0) { |
| 93 | number_of_bits--; |
| 94 | remainder <<= 1; |
| 95 | if ((remainder & 0x10) != 0) |
| 96 | remainder ^= 0x13; |
| 97 | } |
| 98 | |
| 99 | return remainder; |
| 100 | } |
| 101 | |
| 102 | static u8 drm_dp_msg_data_crc4(const uint8_t *data, u8 number_of_bytes) |
| 103 | { |
| 104 | u8 bitmask = 0x80; |
| 105 | u8 bitshift = 7; |
| 106 | u8 array_index = 0; |
| 107 | int number_of_bits = number_of_bytes * 8; |
| 108 | u16 remainder = 0; |
| 109 | |
| 110 | while (number_of_bits != 0) { |
| 111 | number_of_bits--; |
| 112 | remainder <<= 1; |
| 113 | remainder |= (data[array_index] & bitmask) >> bitshift; |
| 114 | bitmask >>= 1; |
| 115 | bitshift--; |
| 116 | if (bitmask == 0) { |
| 117 | bitmask = 0x80; |
| 118 | bitshift = 7; |
| 119 | array_index++; |
| 120 | } |
| 121 | if ((remainder & 0x100) == 0x100) |
| 122 | remainder ^= 0xd5; |
| 123 | } |
| 124 | |
| 125 | number_of_bits = 8; |
| 126 | while (number_of_bits != 0) { |
| 127 | number_of_bits--; |
| 128 | remainder <<= 1; |
| 129 | if ((remainder & 0x100) != 0) |
| 130 | remainder ^= 0xd5; |
| 131 | } |
| 132 | |
| 133 | return remainder & 0xff; |
| 134 | } |
| 135 | static inline u8 drm_dp_calc_sb_hdr_size(struct drm_dp_sideband_msg_hdr *hdr) |
| 136 | { |
| 137 | u8 size = 3; |
| 138 | size += (hdr->lct / 2); |
| 139 | return size; |
| 140 | } |
| 141 | |
| 142 | static void drm_dp_encode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, |
| 143 | u8 *buf, int *len) |
| 144 | { |
| 145 | int idx = 0; |
| 146 | int i; |
| 147 | u8 crc4; |
| 148 | buf[idx++] = ((hdr->lct & 0xf) << 4) | (hdr->lcr & 0xf); |
| 149 | for (i = 0; i < (hdr->lct / 2); i++) |
| 150 | buf[idx++] = hdr->rad[i]; |
| 151 | buf[idx++] = (hdr->broadcast << 7) | (hdr->path_msg << 6) | |
| 152 | (hdr->msg_len & 0x3f); |
| 153 | buf[idx++] = (hdr->somt << 7) | (hdr->eomt << 6) | (hdr->seqno << 4); |
| 154 | |
| 155 | crc4 = drm_dp_msg_header_crc4(buf, (idx * 2) - 1); |
| 156 | buf[idx - 1] |= (crc4 & 0xf); |
| 157 | |
| 158 | *len = idx; |
| 159 | } |
| 160 | |
| 161 | static bool drm_dp_decode_sideband_msg_hdr(struct drm_dp_sideband_msg_hdr *hdr, |
| 162 | u8 *buf, int buflen, u8 *hdrlen) |
| 163 | { |
| 164 | u8 crc4; |
| 165 | u8 len; |
| 166 | int i; |
| 167 | u8 idx; |
| 168 | if (buf[0] == 0) |
| 169 | return false; |
| 170 | len = 3; |
| 171 | len += ((buf[0] & 0xf0) >> 4) / 2; |
| 172 | if (len > buflen) |
| 173 | return false; |
| 174 | crc4 = drm_dp_msg_header_crc4(buf, (len * 2) - 1); |
| 175 | |
| 176 | if ((crc4 & 0xf) != (buf[len - 1] & 0xf)) { |
| 177 | DRM_DEBUG_KMS("crc4 mismatch 0x%x 0x%x\n", crc4, buf[len - 1]); |
| 178 | return false; |
| 179 | } |
| 180 | |
| 181 | hdr->lct = (buf[0] & 0xf0) >> 4; |
| 182 | hdr->lcr = (buf[0] & 0xf); |
| 183 | idx = 1; |
| 184 | for (i = 0; i < (hdr->lct / 2); i++) |
| 185 | hdr->rad[i] = buf[idx++]; |
| 186 | hdr->broadcast = (buf[idx] >> 7) & 0x1; |
| 187 | hdr->path_msg = (buf[idx] >> 6) & 0x1; |
| 188 | hdr->msg_len = buf[idx] & 0x3f; |
| 189 | idx++; |
| 190 | hdr->somt = (buf[idx] >> 7) & 0x1; |
| 191 | hdr->eomt = (buf[idx] >> 6) & 0x1; |
| 192 | hdr->seqno = (buf[idx] >> 4) & 0x1; |
| 193 | idx++; |
| 194 | *hdrlen = idx; |
| 195 | return true; |
| 196 | } |
| 197 | |
| 198 | static void drm_dp_encode_sideband_req(struct drm_dp_sideband_msg_req_body *req, |
| 199 | struct drm_dp_sideband_msg_tx *raw) |
| 200 | { |
| 201 | int idx = 0; |
| 202 | int i; |
| 203 | u8 *buf = raw->msg; |
| 204 | buf[idx++] = req->req_type & 0x7f; |
| 205 | |
| 206 | switch (req->req_type) { |
| 207 | case DP_ENUM_PATH_RESOURCES: |
| 208 | buf[idx] = (req->u.port_num.port_number & 0xf) << 4; |
| 209 | idx++; |
| 210 | break; |
| 211 | case DP_ALLOCATE_PAYLOAD: |
| 212 | buf[idx] = (req->u.allocate_payload.port_number & 0xf) << 4 | |
| 213 | (req->u.allocate_payload.number_sdp_streams & 0xf); |
| 214 | idx++; |
| 215 | buf[idx] = (req->u.allocate_payload.vcpi & 0x7f); |
| 216 | idx++; |
| 217 | buf[idx] = (req->u.allocate_payload.pbn >> 8); |
| 218 | idx++; |
| 219 | buf[idx] = (req->u.allocate_payload.pbn & 0xff); |
| 220 | idx++; |
| 221 | for (i = 0; i < req->u.allocate_payload.number_sdp_streams / 2; i++) { |
| 222 | buf[idx] = ((req->u.allocate_payload.sdp_stream_sink[i * 2] & 0xf) << 4) | |
| 223 | (req->u.allocate_payload.sdp_stream_sink[i * 2 + 1] & 0xf); |
| 224 | idx++; |
| 225 | } |
| 226 | if (req->u.allocate_payload.number_sdp_streams & 1) { |
| 227 | i = req->u.allocate_payload.number_sdp_streams - 1; |
| 228 | buf[idx] = (req->u.allocate_payload.sdp_stream_sink[i] & 0xf) << 4; |
| 229 | idx++; |
| 230 | } |
| 231 | break; |
| 232 | case DP_QUERY_PAYLOAD: |
| 233 | buf[idx] = (req->u.query_payload.port_number & 0xf) << 4; |
| 234 | idx++; |
| 235 | buf[idx] = (req->u.query_payload.vcpi & 0x7f); |
| 236 | idx++; |
| 237 | break; |
| 238 | case DP_REMOTE_DPCD_READ: |
| 239 | buf[idx] = (req->u.dpcd_read.port_number & 0xf) << 4; |
| 240 | buf[idx] |= ((req->u.dpcd_read.dpcd_address & 0xf0000) >> 16) & 0xf; |
| 241 | idx++; |
| 242 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff00) >> 8; |
| 243 | idx++; |
| 244 | buf[idx] = (req->u.dpcd_read.dpcd_address & 0xff); |
| 245 | idx++; |
| 246 | buf[idx] = (req->u.dpcd_read.num_bytes); |
| 247 | idx++; |
| 248 | break; |
| 249 | |
| 250 | case DP_REMOTE_DPCD_WRITE: |
| 251 | buf[idx] = (req->u.dpcd_write.port_number & 0xf) << 4; |
| 252 | buf[idx] |= ((req->u.dpcd_write.dpcd_address & 0xf0000) >> 16) & 0xf; |
| 253 | idx++; |
| 254 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff00) >> 8; |
| 255 | idx++; |
| 256 | buf[idx] = (req->u.dpcd_write.dpcd_address & 0xff); |
| 257 | idx++; |
| 258 | buf[idx] = (req->u.dpcd_write.num_bytes); |
| 259 | idx++; |
| 260 | memcpy(&buf[idx], req->u.dpcd_write.bytes, req->u.dpcd_write.num_bytes); |
| 261 | idx += req->u.dpcd_write.num_bytes; |
| 262 | break; |
| 263 | case DP_REMOTE_I2C_READ: |
| 264 | buf[idx] = (req->u.i2c_read.port_number & 0xf) << 4; |
| 265 | buf[idx] |= (req->u.i2c_read.num_transactions & 0x3); |
| 266 | idx++; |
| 267 | for (i = 0; i < (req->u.i2c_read.num_transactions & 0x3); i++) { |
| 268 | buf[idx] = req->u.i2c_read.transactions[i].i2c_dev_id & 0x7f; |
| 269 | idx++; |
| 270 | buf[idx] = req->u.i2c_read.transactions[i].num_bytes; |
| 271 | idx++; |
| 272 | memcpy(&buf[idx], req->u.i2c_read.transactions[i].bytes, req->u.i2c_read.transactions[i].num_bytes); |
| 273 | idx += req->u.i2c_read.transactions[i].num_bytes; |
| 274 | |
| 275 | buf[idx] = (req->u.i2c_read.transactions[i].no_stop_bit & 0x1) << 5; |
| 276 | buf[idx] |= (req->u.i2c_read.transactions[i].i2c_transaction_delay & 0xf); |
| 277 | idx++; |
| 278 | } |
| 279 | buf[idx] = (req->u.i2c_read.read_i2c_device_id) & 0x7f; |
| 280 | idx++; |
| 281 | buf[idx] = (req->u.i2c_read.num_bytes_read); |
| 282 | idx++; |
| 283 | break; |
| 284 | |
| 285 | case DP_REMOTE_I2C_WRITE: |
| 286 | buf[idx] = (req->u.i2c_write.port_number & 0xf) << 4; |
| 287 | idx++; |
| 288 | buf[idx] = (req->u.i2c_write.write_i2c_device_id) & 0x7f; |
| 289 | idx++; |
| 290 | buf[idx] = (req->u.i2c_write.num_bytes); |
| 291 | idx++; |
| 292 | memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes); |
| 293 | idx += req->u.i2c_write.num_bytes; |
| 294 | break; |
| 295 | } |
| 296 | raw->cur_len = idx; |
| 297 | } |
| 298 | |
| 299 | static void drm_dp_crc_sideband_chunk_req(u8 *msg, u8 len) |
| 300 | { |
| 301 | u8 crc4; |
| 302 | crc4 = drm_dp_msg_data_crc4(msg, len); |
| 303 | msg[len] = crc4; |
| 304 | } |
| 305 | |
| 306 | static void drm_dp_encode_sideband_reply(struct drm_dp_sideband_msg_reply_body *rep, |
| 307 | struct drm_dp_sideband_msg_tx *raw) |
| 308 | { |
| 309 | int idx = 0; |
| 310 | u8 *buf = raw->msg; |
| 311 | |
| 312 | buf[idx++] = (rep->reply_type & 0x1) << 7 | (rep->req_type & 0x7f); |
| 313 | |
| 314 | raw->cur_len = idx; |
| 315 | } |
| 316 | |
| 317 | /* this adds a chunk of msg to the builder to get the final msg */ |
| 318 | static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, |
| 319 | u8 *replybuf, u8 replybuflen, bool hdr) |
| 320 | { |
| 321 | int ret; |
| 322 | u8 crc4; |
| 323 | |
| 324 | if (hdr) { |
| 325 | u8 hdrlen; |
| 326 | struct drm_dp_sideband_msg_hdr recv_hdr; |
| 327 | ret = drm_dp_decode_sideband_msg_hdr(&recv_hdr, replybuf, replybuflen, &hdrlen); |
| 328 | if (ret == false) { |
| 329 | print_hex_dump(KERN_DEBUG, "failed hdr", DUMP_PREFIX_NONE, 16, 1, replybuf, replybuflen, false); |
| 330 | return false; |
| 331 | } |
| 332 | |
| 333 | /* get length contained in this portion */ |
| 334 | msg->curchunk_len = recv_hdr.msg_len; |
| 335 | msg->curchunk_hdrlen = hdrlen; |
| 336 | |
| 337 | /* we have already gotten an somt - don't bother parsing */ |
| 338 | if (recv_hdr.somt && msg->have_somt) |
| 339 | return false; |
| 340 | |
| 341 | if (recv_hdr.somt) { |
| 342 | memcpy(&msg->initial_hdr, &recv_hdr, sizeof(struct drm_dp_sideband_msg_hdr)); |
| 343 | msg->have_somt = true; |
| 344 | } |
| 345 | if (recv_hdr.eomt) |
| 346 | msg->have_eomt = true; |
| 347 | |
| 348 | /* copy the bytes for the remainder of this header chunk */ |
| 349 | msg->curchunk_idx = min(msg->curchunk_len, (u8)(replybuflen - hdrlen)); |
| 350 | memcpy(&msg->chunk[0], replybuf + hdrlen, msg->curchunk_idx); |
| 351 | } else { |
| 352 | memcpy(&msg->chunk[msg->curchunk_idx], replybuf, replybuflen); |
| 353 | msg->curchunk_idx += replybuflen; |
| 354 | } |
| 355 | |
| 356 | if (msg->curchunk_idx >= msg->curchunk_len) { |
| 357 | /* do CRC */ |
| 358 | crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); |
| 359 | /* copy chunk into bigger msg */ |
| 360 | memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); |
| 361 | msg->curlen += msg->curchunk_len - 1; |
| 362 | } |
| 363 | return true; |
| 364 | } |
| 365 | |
| 366 | static bool drm_dp_sideband_parse_link_address(struct drm_dp_sideband_msg_rx *raw, |
| 367 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 368 | { |
| 369 | int idx = 1; |
| 370 | int i; |
| 371 | memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16); |
| 372 | idx += 16; |
| 373 | repmsg->u.link_addr.nports = raw->msg[idx] & 0xf; |
| 374 | idx++; |
| 375 | if (idx > raw->curlen) |
| 376 | goto fail_len; |
| 377 | for (i = 0; i < repmsg->u.link_addr.nports; i++) { |
| 378 | if (raw->msg[idx] & 0x80) |
| 379 | repmsg->u.link_addr.ports[i].input_port = 1; |
| 380 | |
| 381 | repmsg->u.link_addr.ports[i].peer_device_type = (raw->msg[idx] >> 4) & 0x7; |
| 382 | repmsg->u.link_addr.ports[i].port_number = (raw->msg[idx] & 0xf); |
| 383 | |
| 384 | idx++; |
| 385 | if (idx > raw->curlen) |
| 386 | goto fail_len; |
| 387 | repmsg->u.link_addr.ports[i].mcs = (raw->msg[idx] >> 7) & 0x1; |
| 388 | repmsg->u.link_addr.ports[i].ddps = (raw->msg[idx] >> 6) & 0x1; |
| 389 | if (repmsg->u.link_addr.ports[i].input_port == 0) |
| 390 | repmsg->u.link_addr.ports[i].legacy_device_plug_status = (raw->msg[idx] >> 5) & 0x1; |
| 391 | idx++; |
| 392 | if (idx > raw->curlen) |
| 393 | goto fail_len; |
| 394 | if (repmsg->u.link_addr.ports[i].input_port == 0) { |
| 395 | repmsg->u.link_addr.ports[i].dpcd_revision = (raw->msg[idx]); |
| 396 | idx++; |
| 397 | if (idx > raw->curlen) |
| 398 | goto fail_len; |
| 399 | memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16); |
| 400 | idx += 16; |
| 401 | if (idx > raw->curlen) |
| 402 | goto fail_len; |
| 403 | repmsg->u.link_addr.ports[i].num_sdp_streams = (raw->msg[idx] >> 4) & 0xf; |
| 404 | repmsg->u.link_addr.ports[i].num_sdp_stream_sinks = (raw->msg[idx] & 0xf); |
| 405 | idx++; |
| 406 | |
| 407 | } |
| 408 | if (idx > raw->curlen) |
| 409 | goto fail_len; |
| 410 | } |
| 411 | |
| 412 | return true; |
| 413 | fail_len: |
| 414 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); |
| 415 | return false; |
| 416 | } |
| 417 | |
| 418 | static bool drm_dp_sideband_parse_remote_dpcd_read(struct drm_dp_sideband_msg_rx *raw, |
| 419 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 420 | { |
| 421 | int idx = 1; |
| 422 | repmsg->u.remote_dpcd_read_ack.port_number = raw->msg[idx] & 0xf; |
| 423 | idx++; |
| 424 | if (idx > raw->curlen) |
| 425 | goto fail_len; |
| 426 | repmsg->u.remote_dpcd_read_ack.num_bytes = raw->msg[idx]; |
| 427 | if (idx > raw->curlen) |
| 428 | goto fail_len; |
| 429 | |
| 430 | memcpy(repmsg->u.remote_dpcd_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_dpcd_read_ack.num_bytes); |
| 431 | return true; |
| 432 | fail_len: |
| 433 | DRM_DEBUG_KMS("link address reply parse length fail %d %d\n", idx, raw->curlen); |
| 434 | return false; |
| 435 | } |
| 436 | |
| 437 | static bool drm_dp_sideband_parse_remote_dpcd_write(struct drm_dp_sideband_msg_rx *raw, |
| 438 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 439 | { |
| 440 | int idx = 1; |
| 441 | repmsg->u.remote_dpcd_write_ack.port_number = raw->msg[idx] & 0xf; |
| 442 | idx++; |
| 443 | if (idx > raw->curlen) |
| 444 | goto fail_len; |
| 445 | return true; |
| 446 | fail_len: |
| 447 | DRM_DEBUG_KMS("parse length fail %d %d\n", idx, raw->curlen); |
| 448 | return false; |
| 449 | } |
| 450 | |
| 451 | static bool drm_dp_sideband_parse_remote_i2c_read_ack(struct drm_dp_sideband_msg_rx *raw, |
| 452 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 453 | { |
| 454 | int idx = 1; |
| 455 | |
| 456 | repmsg->u.remote_i2c_read_ack.port_number = (raw->msg[idx] & 0xf); |
| 457 | idx++; |
| 458 | if (idx > raw->curlen) |
| 459 | goto fail_len; |
| 460 | repmsg->u.remote_i2c_read_ack.num_bytes = raw->msg[idx]; |
| 461 | idx++; |
| 462 | /* TODO check */ |
| 463 | memcpy(repmsg->u.remote_i2c_read_ack.bytes, &raw->msg[idx], repmsg->u.remote_i2c_read_ack.num_bytes); |
| 464 | return true; |
| 465 | fail_len: |
| 466 | DRM_DEBUG_KMS("remote i2c reply parse length fail %d %d\n", idx, raw->curlen); |
| 467 | return false; |
| 468 | } |
| 469 | |
| 470 | static bool drm_dp_sideband_parse_enum_path_resources_ack(struct drm_dp_sideband_msg_rx *raw, |
| 471 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 472 | { |
| 473 | int idx = 1; |
| 474 | repmsg->u.path_resources.port_number = (raw->msg[idx] >> 4) & 0xf; |
| 475 | idx++; |
| 476 | if (idx > raw->curlen) |
| 477 | goto fail_len; |
| 478 | repmsg->u.path_resources.full_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
| 479 | idx += 2; |
| 480 | if (idx > raw->curlen) |
| 481 | goto fail_len; |
| 482 | repmsg->u.path_resources.avail_payload_bw_number = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
| 483 | idx += 2; |
| 484 | if (idx > raw->curlen) |
| 485 | goto fail_len; |
| 486 | return true; |
| 487 | fail_len: |
| 488 | DRM_DEBUG_KMS("enum resource parse length fail %d %d\n", idx, raw->curlen); |
| 489 | return false; |
| 490 | } |
| 491 | |
| 492 | static bool drm_dp_sideband_parse_allocate_payload_ack(struct drm_dp_sideband_msg_rx *raw, |
| 493 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 494 | { |
| 495 | int idx = 1; |
| 496 | repmsg->u.allocate_payload.port_number = (raw->msg[idx] >> 4) & 0xf; |
| 497 | idx++; |
| 498 | if (idx > raw->curlen) |
| 499 | goto fail_len; |
| 500 | repmsg->u.allocate_payload.vcpi = raw->msg[idx]; |
| 501 | idx++; |
| 502 | if (idx > raw->curlen) |
| 503 | goto fail_len; |
| 504 | repmsg->u.allocate_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx+1]); |
| 505 | idx += 2; |
| 506 | if (idx > raw->curlen) |
| 507 | goto fail_len; |
| 508 | return true; |
| 509 | fail_len: |
| 510 | DRM_DEBUG_KMS("allocate payload parse length fail %d %d\n", idx, raw->curlen); |
| 511 | return false; |
| 512 | } |
| 513 | |
| 514 | static bool drm_dp_sideband_parse_query_payload_ack(struct drm_dp_sideband_msg_rx *raw, |
| 515 | struct drm_dp_sideband_msg_reply_body *repmsg) |
| 516 | { |
| 517 | int idx = 1; |
| 518 | repmsg->u.query_payload.port_number = (raw->msg[idx] >> 4) & 0xf; |
| 519 | idx++; |
| 520 | if (idx > raw->curlen) |
| 521 | goto fail_len; |
| 522 | repmsg->u.query_payload.allocated_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); |
| 523 | idx += 2; |
| 524 | if (idx > raw->curlen) |
| 525 | goto fail_len; |
| 526 | return true; |
| 527 | fail_len: |
| 528 | DRM_DEBUG_KMS("query payload parse length fail %d %d\n", idx, raw->curlen); |
| 529 | return false; |
| 530 | } |
| 531 | |
| 532 | static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw, |
| 533 | struct drm_dp_sideband_msg_reply_body *msg) |
| 534 | { |
| 535 | memset(msg, 0, sizeof(*msg)); |
| 536 | msg->reply_type = (raw->msg[0] & 0x80) >> 7; |
| 537 | msg->req_type = (raw->msg[0] & 0x7f); |
| 538 | |
| 539 | if (msg->reply_type) { |
| 540 | memcpy(msg->u.nak.guid, &raw->msg[1], 16); |
| 541 | msg->u.nak.reason = raw->msg[17]; |
| 542 | msg->u.nak.nak_data = raw->msg[18]; |
| 543 | return false; |
| 544 | } |
| 545 | |
| 546 | switch (msg->req_type) { |
| 547 | case DP_LINK_ADDRESS: |
| 548 | return drm_dp_sideband_parse_link_address(raw, msg); |
| 549 | case DP_QUERY_PAYLOAD: |
| 550 | return drm_dp_sideband_parse_query_payload_ack(raw, msg); |
| 551 | case DP_REMOTE_DPCD_READ: |
| 552 | return drm_dp_sideband_parse_remote_dpcd_read(raw, msg); |
| 553 | case DP_REMOTE_DPCD_WRITE: |
| 554 | return drm_dp_sideband_parse_remote_dpcd_write(raw, msg); |
| 555 | case DP_REMOTE_I2C_READ: |
| 556 | return drm_dp_sideband_parse_remote_i2c_read_ack(raw, msg); |
| 557 | case DP_ENUM_PATH_RESOURCES: |
| 558 | return drm_dp_sideband_parse_enum_path_resources_ack(raw, msg); |
| 559 | case DP_ALLOCATE_PAYLOAD: |
| 560 | return drm_dp_sideband_parse_allocate_payload_ack(raw, msg); |
| 561 | default: |
| 562 | DRM_ERROR("Got unknown reply 0x%02x\n", msg->req_type); |
| 563 | return false; |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | static bool drm_dp_sideband_parse_connection_status_notify(struct drm_dp_sideband_msg_rx *raw, |
| 568 | struct drm_dp_sideband_msg_req_body *msg) |
| 569 | { |
| 570 | int idx = 1; |
| 571 | |
| 572 | msg->u.conn_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; |
| 573 | idx++; |
| 574 | if (idx > raw->curlen) |
| 575 | goto fail_len; |
| 576 | |
| 577 | memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16); |
| 578 | idx += 16; |
| 579 | if (idx > raw->curlen) |
| 580 | goto fail_len; |
| 581 | |
| 582 | msg->u.conn_stat.legacy_device_plug_status = (raw->msg[idx] >> 6) & 0x1; |
| 583 | msg->u.conn_stat.displayport_device_plug_status = (raw->msg[idx] >> 5) & 0x1; |
| 584 | msg->u.conn_stat.message_capability_status = (raw->msg[idx] >> 4) & 0x1; |
| 585 | msg->u.conn_stat.input_port = (raw->msg[idx] >> 3) & 0x1; |
| 586 | msg->u.conn_stat.peer_device_type = (raw->msg[idx] & 0x7); |
| 587 | idx++; |
| 588 | return true; |
| 589 | fail_len: |
| 590 | DRM_DEBUG_KMS("connection status reply parse length fail %d %d\n", idx, raw->curlen); |
| 591 | return false; |
| 592 | } |
| 593 | |
| 594 | static bool drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_msg_rx *raw, |
| 595 | struct drm_dp_sideband_msg_req_body *msg) |
| 596 | { |
| 597 | int idx = 1; |
| 598 | |
| 599 | msg->u.resource_stat.port_number = (raw->msg[idx] & 0xf0) >> 4; |
| 600 | idx++; |
| 601 | if (idx > raw->curlen) |
| 602 | goto fail_len; |
| 603 | |
| 604 | memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16); |
| 605 | idx += 16; |
| 606 | if (idx > raw->curlen) |
| 607 | goto fail_len; |
| 608 | |
| 609 | msg->u.resource_stat.available_pbn = (raw->msg[idx] << 8) | (raw->msg[idx + 1]); |
| 610 | idx++; |
| 611 | return true; |
| 612 | fail_len: |
| 613 | DRM_DEBUG_KMS("resource status reply parse length fail %d %d\n", idx, raw->curlen); |
| 614 | return false; |
| 615 | } |
| 616 | |
| 617 | static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, |
| 618 | struct drm_dp_sideband_msg_req_body *msg) |
| 619 | { |
| 620 | memset(msg, 0, sizeof(*msg)); |
| 621 | msg->req_type = (raw->msg[0] & 0x7f); |
| 622 | |
| 623 | switch (msg->req_type) { |
| 624 | case DP_CONNECTION_STATUS_NOTIFY: |
| 625 | return drm_dp_sideband_parse_connection_status_notify(raw, msg); |
| 626 | case DP_RESOURCE_STATUS_NOTIFY: |
| 627 | return drm_dp_sideband_parse_resource_status_notify(raw, msg); |
| 628 | default: |
| 629 | DRM_ERROR("Got unknown request 0x%02x\n", msg->req_type); |
| 630 | return false; |
| 631 | } |
| 632 | } |
| 633 | |
| 634 | static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) |
| 635 | { |
| 636 | struct drm_dp_sideband_msg_req_body req; |
| 637 | |
| 638 | req.req_type = DP_REMOTE_DPCD_WRITE; |
| 639 | req.u.dpcd_write.port_number = port_num; |
| 640 | req.u.dpcd_write.dpcd_address = offset; |
| 641 | req.u.dpcd_write.num_bytes = num_bytes; |
| 642 | req.u.dpcd_write.bytes = bytes; |
| 643 | drm_dp_encode_sideband_req(&req, msg); |
| 644 | |
| 645 | return 0; |
| 646 | } |
| 647 | |
| 648 | static int build_link_address(struct drm_dp_sideband_msg_tx *msg) |
| 649 | { |
| 650 | struct drm_dp_sideband_msg_req_body req; |
| 651 | |
| 652 | req.req_type = DP_LINK_ADDRESS; |
| 653 | drm_dp_encode_sideband_req(&req, msg); |
| 654 | return 0; |
| 655 | } |
| 656 | |
| 657 | static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) |
| 658 | { |
| 659 | struct drm_dp_sideband_msg_req_body req; |
| 660 | |
| 661 | req.req_type = DP_ENUM_PATH_RESOURCES; |
| 662 | req.u.port_num.port_number = port_num; |
| 663 | drm_dp_encode_sideband_req(&req, msg); |
| 664 | msg->path_msg = true; |
| 665 | return 0; |
| 666 | } |
| 667 | |
| 668 | static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, |
Libin Yang | ef8f9be | 2015-12-02 14:09:43 +0800 | [diff] [blame] | 669 | u8 vcpi, uint16_t pbn, |
| 670 | u8 number_sdp_streams, |
| 671 | u8 *sdp_stream_sink) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 672 | { |
| 673 | struct drm_dp_sideband_msg_req_body req; |
| 674 | memset(&req, 0, sizeof(req)); |
| 675 | req.req_type = DP_ALLOCATE_PAYLOAD; |
| 676 | req.u.allocate_payload.port_number = port_num; |
| 677 | req.u.allocate_payload.vcpi = vcpi; |
| 678 | req.u.allocate_payload.pbn = pbn; |
Libin Yang | ef8f9be | 2015-12-02 14:09:43 +0800 | [diff] [blame] | 679 | req.u.allocate_payload.number_sdp_streams = number_sdp_streams; |
| 680 | memcpy(req.u.allocate_payload.sdp_stream_sink, sdp_stream_sink, |
| 681 | number_sdp_streams); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 682 | drm_dp_encode_sideband_req(&req, msg); |
| 683 | msg->path_msg = true; |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, |
| 688 | struct drm_dp_vcpi *vcpi) |
| 689 | { |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 690 | int ret, vcpi_ret; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 691 | |
| 692 | mutex_lock(&mgr->payload_lock); |
| 693 | ret = find_first_zero_bit(&mgr->payload_mask, mgr->max_payloads + 1); |
| 694 | if (ret > mgr->max_payloads) { |
| 695 | ret = -EINVAL; |
| 696 | DRM_DEBUG_KMS("out of payload ids %d\n", ret); |
| 697 | goto out_unlock; |
| 698 | } |
| 699 | |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 700 | vcpi_ret = find_first_zero_bit(&mgr->vcpi_mask, mgr->max_payloads + 1); |
| 701 | if (vcpi_ret > mgr->max_payloads) { |
| 702 | ret = -EINVAL; |
| 703 | DRM_DEBUG_KMS("out of vcpi ids %d\n", ret); |
| 704 | goto out_unlock; |
| 705 | } |
| 706 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 707 | set_bit(ret, &mgr->payload_mask); |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 708 | set_bit(vcpi_ret, &mgr->vcpi_mask); |
| 709 | vcpi->vcpi = vcpi_ret + 1; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 710 | mgr->proposed_vcpis[ret - 1] = vcpi; |
| 711 | out_unlock: |
| 712 | mutex_unlock(&mgr->payload_lock); |
| 713 | return ret; |
| 714 | } |
| 715 | |
| 716 | static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr, |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 717 | int vcpi) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 718 | { |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 719 | int i; |
| 720 | if (vcpi == 0) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 721 | return; |
| 722 | |
| 723 | mutex_lock(&mgr->payload_lock); |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 724 | DRM_DEBUG_KMS("putting payload %d\n", vcpi); |
| 725 | clear_bit(vcpi - 1, &mgr->vcpi_mask); |
| 726 | |
| 727 | for (i = 0; i < mgr->max_payloads; i++) { |
| 728 | if (mgr->proposed_vcpis[i]) |
| 729 | if (mgr->proposed_vcpis[i]->vcpi == vcpi) { |
| 730 | mgr->proposed_vcpis[i] = NULL; |
| 731 | clear_bit(i + 1, &mgr->payload_mask); |
| 732 | } |
| 733 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 734 | mutex_unlock(&mgr->payload_lock); |
| 735 | } |
| 736 | |
| 737 | static bool check_txmsg_state(struct drm_dp_mst_topology_mgr *mgr, |
| 738 | struct drm_dp_sideband_msg_tx *txmsg) |
| 739 | { |
| 740 | bool ret; |
Daniel Vetter | cd961bb | 2015-01-28 10:02:23 +0100 | [diff] [blame] | 741 | |
| 742 | /* |
| 743 | * All updates to txmsg->state are protected by mgr->qlock, and the two |
| 744 | * cases we check here are terminal states. For those the barriers |
| 745 | * provided by the wake_up/wait_event pair are enough. |
| 746 | */ |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 747 | ret = (txmsg->state == DRM_DP_SIDEBAND_TX_RX || |
| 748 | txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 749 | return ret; |
| 750 | } |
| 751 | |
| 752 | static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, |
| 753 | struct drm_dp_sideband_msg_tx *txmsg) |
| 754 | { |
| 755 | struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; |
| 756 | int ret; |
| 757 | |
| 758 | ret = wait_event_timeout(mgr->tx_waitq, |
| 759 | check_txmsg_state(mgr, txmsg), |
| 760 | (4 * HZ)); |
| 761 | mutex_lock(&mstb->mgr->qlock); |
| 762 | if (ret > 0) { |
| 763 | if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { |
| 764 | ret = -EIO; |
| 765 | goto out; |
| 766 | } |
| 767 | } else { |
| 768 | DRM_DEBUG_KMS("timedout msg send %p %d %d\n", txmsg, txmsg->state, txmsg->seqno); |
| 769 | |
| 770 | /* dump some state */ |
| 771 | ret = -EIO; |
| 772 | |
| 773 | /* remove from q */ |
| 774 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED || |
| 775 | txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND) { |
| 776 | list_del(&txmsg->next); |
| 777 | } |
| 778 | |
| 779 | if (txmsg->state == DRM_DP_SIDEBAND_TX_START_SEND || |
| 780 | txmsg->state == DRM_DP_SIDEBAND_TX_SENT) { |
| 781 | mstb->tx_slots[txmsg->seqno] = NULL; |
| 782 | } |
| 783 | } |
| 784 | out: |
| 785 | mutex_unlock(&mgr->qlock); |
| 786 | |
| 787 | return ret; |
| 788 | } |
| 789 | |
| 790 | static struct drm_dp_mst_branch *drm_dp_add_mst_branch_device(u8 lct, u8 *rad) |
| 791 | { |
| 792 | struct drm_dp_mst_branch *mstb; |
| 793 | |
| 794 | mstb = kzalloc(sizeof(*mstb), GFP_KERNEL); |
| 795 | if (!mstb) |
| 796 | return NULL; |
| 797 | |
| 798 | mstb->lct = lct; |
| 799 | if (lct > 1) |
| 800 | memcpy(mstb->rad, rad, lct / 2); |
| 801 | INIT_LIST_HEAD(&mstb->ports); |
| 802 | kref_init(&mstb->kref); |
| 803 | return mstb; |
| 804 | } |
| 805 | |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 806 | static void drm_dp_free_mst_port(struct kref *kref); |
| 807 | |
| 808 | static void drm_dp_free_mst_branch_device(struct kref *kref) |
| 809 | { |
| 810 | struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); |
| 811 | if (mstb->port_parent) { |
| 812 | if (list_empty(&mstb->port_parent->next)) |
| 813 | kref_put(&mstb->port_parent->kref, drm_dp_free_mst_port); |
| 814 | } |
| 815 | kfree(mstb); |
| 816 | } |
| 817 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 818 | static void drm_dp_destroy_mst_branch_device(struct kref *kref) |
| 819 | { |
| 820 | struct drm_dp_mst_branch *mstb = container_of(kref, struct drm_dp_mst_branch, kref); |
| 821 | struct drm_dp_mst_port *port, *tmp; |
| 822 | bool wake_tx = false; |
| 823 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 824 | /* |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 825 | * init kref again to be used by ports to remove mst branch when it is |
| 826 | * not needed anymore |
| 827 | */ |
| 828 | kref_init(kref); |
| 829 | |
| 830 | if (mstb->port_parent && list_empty(&mstb->port_parent->next)) |
| 831 | kref_get(&mstb->port_parent->kref); |
| 832 | |
| 833 | /* |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 834 | * destroy all ports - don't need lock |
| 835 | * as there are no more references to the mst branch |
| 836 | * device at this point. |
| 837 | */ |
| 838 | list_for_each_entry_safe(port, tmp, &mstb->ports, next) { |
| 839 | list_del(&port->next); |
| 840 | drm_dp_put_port(port); |
| 841 | } |
| 842 | |
| 843 | /* drop any tx slots msg */ |
| 844 | mutex_lock(&mstb->mgr->qlock); |
| 845 | if (mstb->tx_slots[0]) { |
| 846 | mstb->tx_slots[0]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
| 847 | mstb->tx_slots[0] = NULL; |
| 848 | wake_tx = true; |
| 849 | } |
| 850 | if (mstb->tx_slots[1]) { |
| 851 | mstb->tx_slots[1]->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
| 852 | mstb->tx_slots[1] = NULL; |
| 853 | wake_tx = true; |
| 854 | } |
| 855 | mutex_unlock(&mstb->mgr->qlock); |
| 856 | |
| 857 | if (wake_tx) |
| 858 | wake_up(&mstb->mgr->tx_waitq); |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 859 | |
| 860 | kref_put(kref, drm_dp_free_mst_branch_device); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 861 | } |
| 862 | |
| 863 | static void drm_dp_put_mst_branch_device(struct drm_dp_mst_branch *mstb) |
| 864 | { |
| 865 | kref_put(&mstb->kref, drm_dp_destroy_mst_branch_device); |
| 866 | } |
| 867 | |
| 868 | |
| 869 | static void drm_dp_port_teardown_pdt(struct drm_dp_mst_port *port, int old_pdt) |
| 870 | { |
Daniel Vetter | 0391359 | 2014-12-08 22:55:22 +0100 | [diff] [blame] | 871 | struct drm_dp_mst_branch *mstb; |
| 872 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 873 | switch (old_pdt) { |
| 874 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
| 875 | case DP_PEER_DEVICE_SST_SINK: |
| 876 | /* remove i2c over sideband */ |
| 877 | drm_dp_mst_unregister_i2c_bus(&port->aux); |
| 878 | break; |
| 879 | case DP_PEER_DEVICE_MST_BRANCHING: |
Daniel Vetter | 0391359 | 2014-12-08 22:55:22 +0100 | [diff] [blame] | 880 | mstb = port->mstb; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 881 | port->mstb = NULL; |
Daniel Vetter | 0391359 | 2014-12-08 22:55:22 +0100 | [diff] [blame] | 882 | drm_dp_put_mst_branch_device(mstb); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 883 | break; |
| 884 | } |
| 885 | } |
| 886 | |
| 887 | static void drm_dp_destroy_port(struct kref *kref) |
| 888 | { |
| 889 | struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); |
| 890 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
Dave Airlie | df4839f | 2015-09-16 10:37:28 +1000 | [diff] [blame] | 891 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 892 | if (!port->input) { |
| 893 | port->vcpi.num_slots = 0; |
Dave Airlie | c6a0aed | 2014-10-20 16:28:02 +1000 | [diff] [blame] | 894 | |
| 895 | kfree(port->cached_edid); |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 896 | |
Dave Airlie | df4839f | 2015-09-16 10:37:28 +1000 | [diff] [blame] | 897 | /* |
| 898 | * The only time we don't have a connector |
| 899 | * on an output port is if the connector init |
| 900 | * fails. |
| 901 | */ |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 902 | if (port->connector) { |
Dave Airlie | df4839f | 2015-09-16 10:37:28 +1000 | [diff] [blame] | 903 | /* we can't destroy the connector here, as |
| 904 | * we might be holding the mode_config.mutex |
| 905 | * from an EDID retrieval */ |
| 906 | |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 907 | mutex_lock(&mgr->destroy_connector_lock); |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 908 | kref_get(&port->parent->kref); |
Maarten Lankhorst | 4772ff0 | 2015-08-11 09:54:29 +0200 | [diff] [blame] | 909 | list_add(&port->next, &mgr->destroy_connector_list); |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 910 | mutex_unlock(&mgr->destroy_connector_lock); |
| 911 | schedule_work(&mgr->destroy_connector_work); |
Maarten Lankhorst | 4772ff0 | 2015-08-11 09:54:29 +0200 | [diff] [blame] | 912 | return; |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 913 | } |
Dave Airlie | df4839f | 2015-09-16 10:37:28 +1000 | [diff] [blame] | 914 | /* no need to clean up vcpi |
| 915 | * as if we have no connector we never setup a vcpi */ |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 916 | drm_dp_port_teardown_pdt(port, port->pdt); |
Ville Syrjälä | 36e3fa6 | 2016-10-26 16:30:33 +0300 | [diff] [blame] | 917 | port->pdt = DP_PEER_DEVICE_NONE; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 918 | } |
| 919 | kfree(port); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 920 | } |
| 921 | |
| 922 | static void drm_dp_put_port(struct drm_dp_mst_port *port) |
| 923 | { |
| 924 | kref_put(&port->kref, drm_dp_destroy_port); |
| 925 | } |
| 926 | |
| 927 | 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) |
| 928 | { |
| 929 | struct drm_dp_mst_port *port; |
| 930 | struct drm_dp_mst_branch *rmstb; |
| 931 | if (to_find == mstb) { |
| 932 | kref_get(&mstb->kref); |
| 933 | return mstb; |
| 934 | } |
| 935 | list_for_each_entry(port, &mstb->ports, next) { |
| 936 | if (port->mstb) { |
| 937 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(port->mstb, to_find); |
| 938 | if (rmstb) |
| 939 | return rmstb; |
| 940 | } |
| 941 | } |
| 942 | return NULL; |
| 943 | } |
| 944 | |
| 945 | 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) |
| 946 | { |
| 947 | struct drm_dp_mst_branch *rmstb = NULL; |
| 948 | mutex_lock(&mgr->lock); |
| 949 | if (mgr->mst_primary) |
| 950 | rmstb = drm_dp_mst_get_validated_mstb_ref_locked(mgr->mst_primary, mstb); |
| 951 | mutex_unlock(&mgr->lock); |
| 952 | return rmstb; |
| 953 | } |
| 954 | |
| 955 | 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) |
| 956 | { |
| 957 | struct drm_dp_mst_port *port, *mport; |
| 958 | |
| 959 | list_for_each_entry(port, &mstb->ports, next) { |
| 960 | if (port == to_find) { |
| 961 | kref_get(&port->kref); |
| 962 | return port; |
| 963 | } |
| 964 | if (port->mstb) { |
| 965 | mport = drm_dp_mst_get_port_ref_locked(port->mstb, to_find); |
| 966 | if (mport) |
| 967 | return mport; |
| 968 | } |
| 969 | } |
| 970 | return NULL; |
| 971 | } |
| 972 | |
| 973 | 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) |
| 974 | { |
| 975 | struct drm_dp_mst_port *rport = NULL; |
| 976 | mutex_lock(&mgr->lock); |
| 977 | if (mgr->mst_primary) |
| 978 | rport = drm_dp_mst_get_port_ref_locked(mgr->mst_primary, port); |
| 979 | mutex_unlock(&mgr->lock); |
| 980 | return rport; |
| 981 | } |
| 982 | |
| 983 | static struct drm_dp_mst_port *drm_dp_get_port(struct drm_dp_mst_branch *mstb, u8 port_num) |
| 984 | { |
| 985 | struct drm_dp_mst_port *port; |
| 986 | |
| 987 | list_for_each_entry(port, &mstb->ports, next) { |
| 988 | if (port->port_num == port_num) { |
| 989 | kref_get(&port->kref); |
| 990 | return port; |
| 991 | } |
| 992 | } |
| 993 | |
| 994 | return NULL; |
| 995 | } |
| 996 | |
| 997 | /* |
| 998 | * calculate a new RAD for this MST branch device |
| 999 | * if parent has an LCT of 2 then it has 1 nibble of RAD, |
| 1000 | * if parent has an LCT of 3 then it has 2 nibbles of RAD, |
| 1001 | */ |
| 1002 | static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, |
| 1003 | u8 *rad) |
| 1004 | { |
Mykola Lysenko | 75af4c8 | 2015-12-25 16:14:47 +0800 | [diff] [blame] | 1005 | int parent_lct = port->parent->lct; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1006 | int shift = 4; |
Mykola Lysenko | 75af4c8 | 2015-12-25 16:14:47 +0800 | [diff] [blame] | 1007 | int idx = (parent_lct - 1) / 2; |
| 1008 | if (parent_lct > 1) { |
| 1009 | memcpy(rad, port->parent->rad, idx + 1); |
| 1010 | shift = (parent_lct % 2) ? 4 : 0; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1011 | } else |
| 1012 | rad[0] = 0; |
| 1013 | |
| 1014 | rad[idx] |= port->port_num << shift; |
Mykola Lysenko | 75af4c8 | 2015-12-25 16:14:47 +0800 | [diff] [blame] | 1015 | return parent_lct + 1; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1016 | } |
| 1017 | |
| 1018 | /* |
| 1019 | * return sends link address for new mstb |
| 1020 | */ |
| 1021 | static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) |
| 1022 | { |
| 1023 | int ret; |
| 1024 | u8 rad[6], lct; |
| 1025 | bool send_link = false; |
| 1026 | switch (port->pdt) { |
| 1027 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
| 1028 | case DP_PEER_DEVICE_SST_SINK: |
| 1029 | /* add i2c over sideband */ |
| 1030 | ret = drm_dp_mst_register_i2c_bus(&port->aux); |
| 1031 | break; |
| 1032 | case DP_PEER_DEVICE_MST_BRANCHING: |
| 1033 | lct = drm_dp_calculate_rad(port, rad); |
| 1034 | |
| 1035 | port->mstb = drm_dp_add_mst_branch_device(lct, rad); |
| 1036 | port->mstb->mgr = port->mgr; |
| 1037 | port->mstb->port_parent = port; |
| 1038 | |
| 1039 | send_link = true; |
| 1040 | break; |
| 1041 | } |
| 1042 | return send_link; |
| 1043 | } |
| 1044 | |
Hersen Wu | 5e93b82 | 2016-01-22 17:07:28 -0500 | [diff] [blame] | 1045 | static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1046 | { |
| 1047 | int ret; |
Hersen Wu | 5e93b82 | 2016-01-22 17:07:28 -0500 | [diff] [blame] | 1048 | |
| 1049 | memcpy(mstb->guid, guid, 16); |
| 1050 | |
| 1051 | if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { |
| 1052 | if (mstb->port_parent) { |
| 1053 | ret = drm_dp_send_dpcd_write( |
| 1054 | mstb->mgr, |
| 1055 | mstb->port_parent, |
| 1056 | DP_GUID, |
| 1057 | 16, |
| 1058 | mstb->guid); |
| 1059 | } else { |
| 1060 | |
| 1061 | ret = drm_dp_dpcd_write( |
| 1062 | mstb->mgr->aux, |
| 1063 | DP_GUID, |
| 1064 | mstb->guid, |
| 1065 | 16); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1066 | } |
| 1067 | } |
| 1068 | } |
| 1069 | |
Dave Airlie | 1c96087 | 2015-09-16 11:04:49 +1000 | [diff] [blame] | 1070 | static void build_mst_prop_path(const struct drm_dp_mst_branch *mstb, |
| 1071 | int pnum, |
Rickard Strandqvist | d87af4d | 2014-10-12 00:02:32 +0200 | [diff] [blame] | 1072 | char *proppath, |
| 1073 | size_t proppath_size) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1074 | { |
| 1075 | int i; |
| 1076 | char temp[8]; |
Rickard Strandqvist | d87af4d | 2014-10-12 00:02:32 +0200 | [diff] [blame] | 1077 | snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1078 | for (i = 0; i < (mstb->lct - 1); i++) { |
| 1079 | int shift = (i % 2) ? 0 : 4; |
Mykola Lysenko | 7a11a33 | 2015-12-25 16:14:48 +0800 | [diff] [blame] | 1080 | int port_num = (mstb->rad[i / 2] >> shift) & 0xf; |
Rickard Strandqvist | d87af4d | 2014-10-12 00:02:32 +0200 | [diff] [blame] | 1081 | snprintf(temp, sizeof(temp), "-%d", port_num); |
| 1082 | strlcat(proppath, temp, proppath_size); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1083 | } |
Dave Airlie | 1c96087 | 2015-09-16 11:04:49 +1000 | [diff] [blame] | 1084 | snprintf(temp, sizeof(temp), "-%d", pnum); |
Rickard Strandqvist | d87af4d | 2014-10-12 00:02:32 +0200 | [diff] [blame] | 1085 | strlcat(proppath, temp, proppath_size); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1086 | } |
| 1087 | |
| 1088 | static void drm_dp_add_port(struct drm_dp_mst_branch *mstb, |
| 1089 | struct device *dev, |
| 1090 | struct drm_dp_link_addr_reply_port *port_msg) |
| 1091 | { |
| 1092 | struct drm_dp_mst_port *port; |
| 1093 | bool ret; |
| 1094 | bool created = false; |
| 1095 | int old_pdt = 0; |
| 1096 | int old_ddps = 0; |
| 1097 | port = drm_dp_get_port(mstb, port_msg->port_number); |
| 1098 | if (!port) { |
| 1099 | port = kzalloc(sizeof(*port), GFP_KERNEL); |
| 1100 | if (!port) |
| 1101 | return; |
| 1102 | kref_init(&port->kref); |
| 1103 | port->parent = mstb; |
| 1104 | port->port_num = port_msg->port_number; |
| 1105 | port->mgr = mstb->mgr; |
| 1106 | port->aux.name = "DPMST"; |
| 1107 | port->aux.dev = dev; |
| 1108 | created = true; |
| 1109 | } else { |
| 1110 | old_pdt = port->pdt; |
| 1111 | old_ddps = port->ddps; |
| 1112 | } |
| 1113 | |
| 1114 | port->pdt = port_msg->peer_device_type; |
| 1115 | port->input = port_msg->input_port; |
| 1116 | port->mcs = port_msg->mcs; |
| 1117 | port->ddps = port_msg->ddps; |
| 1118 | port->ldps = port_msg->legacy_device_plug_status; |
| 1119 | port->dpcd_rev = port_msg->dpcd_revision; |
| 1120 | port->num_sdp_streams = port_msg->num_sdp_streams; |
| 1121 | port->num_sdp_stream_sinks = port_msg->num_sdp_stream_sinks; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1122 | |
| 1123 | /* manage mstb port lists with mgr lock - take a reference |
| 1124 | for this list */ |
| 1125 | if (created) { |
| 1126 | mutex_lock(&mstb->mgr->lock); |
| 1127 | kref_get(&port->kref); |
| 1128 | list_add(&port->next, &mstb->ports); |
| 1129 | mutex_unlock(&mstb->mgr->lock); |
| 1130 | } |
| 1131 | |
| 1132 | if (old_ddps != port->ddps) { |
| 1133 | if (port->ddps) { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1134 | if (!port->input) |
| 1135 | drm_dp_send_enum_path_resources(mstb->mgr, mstb, port); |
| 1136 | } else { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1137 | port->available_pbn = 0; |
| 1138 | } |
| 1139 | } |
| 1140 | |
| 1141 | if (old_pdt != port->pdt && !port->input) { |
| 1142 | drm_dp_port_teardown_pdt(port, old_pdt); |
| 1143 | |
| 1144 | ret = drm_dp_port_setup_pdt(port); |
Dave Airlie | 68d8c9f | 2015-09-06 18:53:00 +1000 | [diff] [blame] | 1145 | if (ret == true) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1146 | drm_dp_send_link_address(mstb->mgr, port->mstb); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1147 | } |
| 1148 | |
| 1149 | if (created && !port->input) { |
| 1150 | char proppath[255]; |
Dave Airlie | 1c96087 | 2015-09-16 11:04:49 +1000 | [diff] [blame] | 1151 | |
| 1152 | build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath)); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1153 | port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath); |
Dave Airlie | df4839f | 2015-09-16 10:37:28 +1000 | [diff] [blame] | 1154 | if (!port->connector) { |
| 1155 | /* remove it from the port list */ |
| 1156 | mutex_lock(&mstb->mgr->lock); |
| 1157 | list_del(&port->next); |
| 1158 | mutex_unlock(&mstb->mgr->lock); |
| 1159 | /* drop port list reference */ |
| 1160 | drm_dp_put_port(port); |
| 1161 | goto out; |
| 1162 | } |
Ville Syrjälä | 4da5caa | 2016-10-26 12:05:55 +0300 | [diff] [blame] | 1163 | if ((port->pdt == DP_PEER_DEVICE_DP_LEGACY_CONV || |
| 1164 | port->pdt == DP_PEER_DEVICE_SST_SINK) && |
| 1165 | port->port_num >= DP_MST_LOGICAL_PORT_0) { |
Dave Airlie | 8ae22cb | 2016-02-17 11:36:38 +1000 | [diff] [blame] | 1166 | port->cached_edid = drm_get_edid(port->connector, &port->aux.ddc); |
| 1167 | drm_mode_connector_set_tile_property(port->connector); |
| 1168 | } |
Dave Airlie | d9515c5 | 2015-09-16 17:55:23 +1000 | [diff] [blame] | 1169 | (*mstb->mgr->cbs->register_connector)(port->connector); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1170 | } |
Dave Airlie | 8ae22cb | 2016-02-17 11:36:38 +1000 | [diff] [blame] | 1171 | |
Dave Airlie | df4839f | 2015-09-16 10:37:28 +1000 | [diff] [blame] | 1172 | out: |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1173 | /* put reference to this port */ |
| 1174 | drm_dp_put_port(port); |
| 1175 | } |
| 1176 | |
| 1177 | static void drm_dp_update_port(struct drm_dp_mst_branch *mstb, |
| 1178 | struct drm_dp_connection_status_notify *conn_stat) |
| 1179 | { |
| 1180 | struct drm_dp_mst_port *port; |
| 1181 | int old_pdt; |
| 1182 | int old_ddps; |
| 1183 | bool dowork = false; |
| 1184 | port = drm_dp_get_port(mstb, conn_stat->port_number); |
| 1185 | if (!port) |
| 1186 | return; |
| 1187 | |
| 1188 | old_ddps = port->ddps; |
| 1189 | old_pdt = port->pdt; |
| 1190 | port->pdt = conn_stat->peer_device_type; |
| 1191 | port->mcs = conn_stat->message_capability_status; |
| 1192 | port->ldps = conn_stat->legacy_device_plug_status; |
| 1193 | port->ddps = conn_stat->displayport_device_plug_status; |
| 1194 | |
| 1195 | if (old_ddps != port->ddps) { |
| 1196 | if (port->ddps) { |
Dave Airlie | 8ae22cb | 2016-02-17 11:36:38 +1000 | [diff] [blame] | 1197 | dowork = true; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1198 | } else { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1199 | port->available_pbn = 0; |
| 1200 | } |
| 1201 | } |
| 1202 | if (old_pdt != port->pdt && !port->input) { |
| 1203 | drm_dp_port_teardown_pdt(port, old_pdt); |
| 1204 | |
| 1205 | if (drm_dp_port_setup_pdt(port)) |
| 1206 | dowork = true; |
| 1207 | } |
| 1208 | |
| 1209 | drm_dp_put_port(port); |
| 1210 | if (dowork) |
| 1211 | queue_work(system_long_wq, &mstb->mgr->work); |
| 1212 | |
| 1213 | } |
| 1214 | |
| 1215 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_topology_mgr *mgr, |
| 1216 | u8 lct, u8 *rad) |
| 1217 | { |
| 1218 | struct drm_dp_mst_branch *mstb; |
| 1219 | struct drm_dp_mst_port *port; |
| 1220 | int i; |
| 1221 | /* find the port by iterating down */ |
Dave Airlie | 9eb1e57 | 2015-06-22 14:40:44 +1000 | [diff] [blame] | 1222 | |
| 1223 | mutex_lock(&mgr->lock); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1224 | mstb = mgr->mst_primary; |
| 1225 | |
| 1226 | for (i = 0; i < lct - 1; i++) { |
| 1227 | int shift = (i % 2) ? 0 : 4; |
Mykola Lysenko | 7a11a33 | 2015-12-25 16:14:48 +0800 | [diff] [blame] | 1228 | int port_num = (rad[i / 2] >> shift) & 0xf; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1229 | |
| 1230 | list_for_each_entry(port, &mstb->ports, next) { |
| 1231 | if (port->port_num == port_num) { |
Adam Richter | 30730c7 | 2015-10-16 03:33:02 -0700 | [diff] [blame] | 1232 | mstb = port->mstb; |
| 1233 | if (!mstb) { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1234 | DRM_ERROR("failed to lookup MSTB with lct %d, rad %02x\n", lct, rad[0]); |
Adam Richter | 30730c7 | 2015-10-16 03:33:02 -0700 | [diff] [blame] | 1235 | goto out; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1236 | } |
| 1237 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1238 | break; |
| 1239 | } |
| 1240 | } |
| 1241 | } |
| 1242 | kref_get(&mstb->kref); |
Adam Richter | 30730c7 | 2015-10-16 03:33:02 -0700 | [diff] [blame] | 1243 | out: |
Dave Airlie | 9eb1e57 | 2015-06-22 14:40:44 +1000 | [diff] [blame] | 1244 | mutex_unlock(&mgr->lock); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1245 | return mstb; |
| 1246 | } |
| 1247 | |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 1248 | static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper( |
| 1249 | struct drm_dp_mst_branch *mstb, |
| 1250 | uint8_t *guid) |
| 1251 | { |
| 1252 | struct drm_dp_mst_branch *found_mstb; |
| 1253 | struct drm_dp_mst_port *port; |
| 1254 | |
Hersen Wu | 5e93b82 | 2016-01-22 17:07:28 -0500 | [diff] [blame] | 1255 | if (memcmp(mstb->guid, guid, 16) == 0) |
| 1256 | return mstb; |
| 1257 | |
| 1258 | |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 1259 | list_for_each_entry(port, &mstb->ports, next) { |
| 1260 | if (!port->mstb) |
| 1261 | continue; |
| 1262 | |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 1263 | found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid); |
| 1264 | |
| 1265 | if (found_mstb) |
| 1266 | return found_mstb; |
| 1267 | } |
| 1268 | |
| 1269 | return NULL; |
| 1270 | } |
| 1271 | |
| 1272 | static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device_by_guid( |
| 1273 | struct drm_dp_mst_topology_mgr *mgr, |
| 1274 | uint8_t *guid) |
| 1275 | { |
| 1276 | struct drm_dp_mst_branch *mstb; |
| 1277 | |
| 1278 | /* find the port by iterating down */ |
| 1279 | mutex_lock(&mgr->lock); |
| 1280 | |
Hersen Wu | 5e93b82 | 2016-01-22 17:07:28 -0500 | [diff] [blame] | 1281 | mstb = get_mst_branch_device_by_guid_helper(mgr->mst_primary, guid); |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 1282 | |
| 1283 | if (mstb) |
| 1284 | kref_get(&mstb->kref); |
| 1285 | |
| 1286 | mutex_unlock(&mgr->lock); |
| 1287 | return mstb; |
| 1288 | } |
| 1289 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1290 | static void drm_dp_check_and_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
| 1291 | struct drm_dp_mst_branch *mstb) |
| 1292 | { |
| 1293 | struct drm_dp_mst_port *port; |
Daniel Vetter | 9254ec4 | 2015-06-22 17:31:59 +1000 | [diff] [blame] | 1294 | struct drm_dp_mst_branch *mstb_child; |
Dave Airlie | 68d8c9f | 2015-09-06 18:53:00 +1000 | [diff] [blame] | 1295 | if (!mstb->link_address_sent) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1296 | drm_dp_send_link_address(mgr, mstb); |
Dave Airlie | 68d8c9f | 2015-09-06 18:53:00 +1000 | [diff] [blame] | 1297 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1298 | list_for_each_entry(port, &mstb->ports, next) { |
| 1299 | if (port->input) |
| 1300 | continue; |
| 1301 | |
Dave Airlie | 8ae22cb | 2016-02-17 11:36:38 +1000 | [diff] [blame] | 1302 | if (!port->ddps) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1303 | continue; |
| 1304 | |
| 1305 | if (!port->available_pbn) |
| 1306 | drm_dp_send_enum_path_resources(mgr, mstb, port); |
| 1307 | |
Daniel Vetter | 9254ec4 | 2015-06-22 17:31:59 +1000 | [diff] [blame] | 1308 | if (port->mstb) { |
| 1309 | mstb_child = drm_dp_get_validated_mstb_ref(mgr, port->mstb); |
| 1310 | if (mstb_child) { |
| 1311 | drm_dp_check_and_send_link_address(mgr, mstb_child); |
| 1312 | drm_dp_put_mst_branch_device(mstb_child); |
| 1313 | } |
| 1314 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1315 | } |
| 1316 | } |
| 1317 | |
| 1318 | static void drm_dp_mst_link_probe_work(struct work_struct *work) |
| 1319 | { |
| 1320 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, work); |
Daniel Vetter | 9254ec4 | 2015-06-22 17:31:59 +1000 | [diff] [blame] | 1321 | struct drm_dp_mst_branch *mstb; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1322 | |
Daniel Vetter | 9254ec4 | 2015-06-22 17:31:59 +1000 | [diff] [blame] | 1323 | mutex_lock(&mgr->lock); |
| 1324 | mstb = mgr->mst_primary; |
| 1325 | if (mstb) { |
| 1326 | kref_get(&mstb->kref); |
| 1327 | } |
| 1328 | mutex_unlock(&mgr->lock); |
| 1329 | if (mstb) { |
| 1330 | drm_dp_check_and_send_link_address(mgr, mstb); |
| 1331 | drm_dp_put_mst_branch_device(mstb); |
| 1332 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1333 | } |
| 1334 | |
| 1335 | static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, |
| 1336 | u8 *guid) |
| 1337 | { |
| 1338 | static u8 zero_guid[16]; |
| 1339 | |
| 1340 | if (!memcmp(guid, zero_guid, 16)) { |
| 1341 | u64 salt = get_jiffies_64(); |
| 1342 | memcpy(&guid[0], &salt, sizeof(u64)); |
| 1343 | memcpy(&guid[8], &salt, sizeof(u64)); |
| 1344 | return false; |
| 1345 | } |
| 1346 | return true; |
| 1347 | } |
| 1348 | |
| 1349 | #if 0 |
| 1350 | static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) |
| 1351 | { |
| 1352 | struct drm_dp_sideband_msg_req_body req; |
| 1353 | |
| 1354 | req.req_type = DP_REMOTE_DPCD_READ; |
| 1355 | req.u.dpcd_read.port_number = port_num; |
| 1356 | req.u.dpcd_read.dpcd_address = offset; |
| 1357 | req.u.dpcd_read.num_bytes = num_bytes; |
| 1358 | drm_dp_encode_sideband_req(&req, msg); |
| 1359 | |
| 1360 | return 0; |
| 1361 | } |
| 1362 | #endif |
| 1363 | |
| 1364 | static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, |
| 1365 | bool up, u8 *msg, int len) |
| 1366 | { |
| 1367 | int ret; |
| 1368 | int regbase = up ? DP_SIDEBAND_MSG_UP_REP_BASE : DP_SIDEBAND_MSG_DOWN_REQ_BASE; |
| 1369 | int tosend, total, offset; |
| 1370 | int retries = 0; |
| 1371 | |
| 1372 | retry: |
| 1373 | total = len; |
| 1374 | offset = 0; |
| 1375 | do { |
| 1376 | tosend = min3(mgr->max_dpcd_transaction_bytes, 16, total); |
| 1377 | |
| 1378 | ret = drm_dp_dpcd_write(mgr->aux, regbase + offset, |
| 1379 | &msg[offset], |
| 1380 | tosend); |
| 1381 | if (ret != tosend) { |
| 1382 | if (ret == -EIO && retries < 5) { |
| 1383 | retries++; |
| 1384 | goto retry; |
| 1385 | } |
| 1386 | DRM_DEBUG_KMS("failed to dpcd write %d %d\n", tosend, ret); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1387 | |
| 1388 | return -EIO; |
| 1389 | } |
| 1390 | offset += tosend; |
| 1391 | total -= tosend; |
| 1392 | } while (total > 0); |
| 1393 | return 0; |
| 1394 | } |
| 1395 | |
| 1396 | static int set_hdr_from_dst_qlock(struct drm_dp_sideband_msg_hdr *hdr, |
| 1397 | struct drm_dp_sideband_msg_tx *txmsg) |
| 1398 | { |
| 1399 | struct drm_dp_mst_branch *mstb = txmsg->dst; |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 1400 | u8 req_type; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1401 | |
| 1402 | /* both msg slots are full */ |
| 1403 | if (txmsg->seqno == -1) { |
| 1404 | if (mstb->tx_slots[0] && mstb->tx_slots[1]) { |
| 1405 | DRM_DEBUG_KMS("%s: failed to find slot\n", __func__); |
| 1406 | return -EAGAIN; |
| 1407 | } |
| 1408 | if (mstb->tx_slots[0] == NULL && mstb->tx_slots[1] == NULL) { |
| 1409 | txmsg->seqno = mstb->last_seqno; |
| 1410 | mstb->last_seqno ^= 1; |
| 1411 | } else if (mstb->tx_slots[0] == NULL) |
| 1412 | txmsg->seqno = 0; |
| 1413 | else |
| 1414 | txmsg->seqno = 1; |
| 1415 | mstb->tx_slots[txmsg->seqno] = txmsg; |
| 1416 | } |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 1417 | |
| 1418 | req_type = txmsg->msg[0] & 0x7f; |
| 1419 | if (req_type == DP_CONNECTION_STATUS_NOTIFY || |
| 1420 | req_type == DP_RESOURCE_STATUS_NOTIFY) |
| 1421 | hdr->broadcast = 1; |
| 1422 | else |
| 1423 | hdr->broadcast = 0; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1424 | hdr->path_msg = txmsg->path_msg; |
| 1425 | hdr->lct = mstb->lct; |
| 1426 | hdr->lcr = mstb->lct - 1; |
| 1427 | if (mstb->lct > 1) |
| 1428 | memcpy(hdr->rad, mstb->rad, mstb->lct / 2); |
| 1429 | hdr->seqno = txmsg->seqno; |
| 1430 | return 0; |
| 1431 | } |
| 1432 | /* |
| 1433 | * process a single block of the next message in the sideband queue |
| 1434 | */ |
| 1435 | static int process_single_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, |
| 1436 | struct drm_dp_sideband_msg_tx *txmsg, |
| 1437 | bool up) |
| 1438 | { |
| 1439 | u8 chunk[48]; |
| 1440 | struct drm_dp_sideband_msg_hdr hdr; |
| 1441 | int len, space, idx, tosend; |
| 1442 | int ret; |
| 1443 | |
Damien Lespiau | bf3719c | 2014-07-14 12:13:18 +0100 | [diff] [blame] | 1444 | memset(&hdr, 0, sizeof(struct drm_dp_sideband_msg_hdr)); |
| 1445 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1446 | if (txmsg->state == DRM_DP_SIDEBAND_TX_QUEUED) { |
| 1447 | txmsg->seqno = -1; |
| 1448 | txmsg->state = DRM_DP_SIDEBAND_TX_START_SEND; |
| 1449 | } |
| 1450 | |
| 1451 | /* make hdr from dst mst - for replies use seqno |
| 1452 | otherwise assign one */ |
| 1453 | ret = set_hdr_from_dst_qlock(&hdr, txmsg); |
| 1454 | if (ret < 0) |
| 1455 | return ret; |
| 1456 | |
| 1457 | /* amount left to send in this message */ |
| 1458 | len = txmsg->cur_len - txmsg->cur_offset; |
| 1459 | |
| 1460 | /* 48 - sideband msg size - 1 byte for data CRC, x header bytes */ |
| 1461 | space = 48 - 1 - drm_dp_calc_sb_hdr_size(&hdr); |
| 1462 | |
| 1463 | tosend = min(len, space); |
| 1464 | if (len == txmsg->cur_len) |
| 1465 | hdr.somt = 1; |
| 1466 | if (space >= len) |
| 1467 | hdr.eomt = 1; |
| 1468 | |
| 1469 | |
| 1470 | hdr.msg_len = tosend + 1; |
| 1471 | drm_dp_encode_sideband_msg_hdr(&hdr, chunk, &idx); |
| 1472 | memcpy(&chunk[idx], &txmsg->msg[txmsg->cur_offset], tosend); |
| 1473 | /* add crc at end */ |
| 1474 | drm_dp_crc_sideband_chunk_req(&chunk[idx], tosend); |
| 1475 | idx += tosend + 1; |
| 1476 | |
| 1477 | ret = drm_dp_send_sideband_msg(mgr, up, chunk, idx); |
| 1478 | if (ret) { |
| 1479 | DRM_DEBUG_KMS("sideband msg failed to send\n"); |
| 1480 | return ret; |
| 1481 | } |
| 1482 | |
| 1483 | txmsg->cur_offset += tosend; |
| 1484 | if (txmsg->cur_offset == txmsg->cur_len) { |
| 1485 | txmsg->state = DRM_DP_SIDEBAND_TX_SENT; |
| 1486 | return 1; |
| 1487 | } |
| 1488 | return 0; |
| 1489 | } |
| 1490 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1491 | static void process_single_down_tx_qlock(struct drm_dp_mst_topology_mgr *mgr) |
| 1492 | { |
| 1493 | struct drm_dp_sideband_msg_tx *txmsg; |
| 1494 | int ret; |
| 1495 | |
Daniel Vetter | cd961bb | 2015-01-28 10:02:23 +0100 | [diff] [blame] | 1496 | WARN_ON(!mutex_is_locked(&mgr->qlock)); |
| 1497 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1498 | /* construct a chunk from the first msg in the tx_msg queue */ |
Daniel Vetter | cb021a3 | 2016-07-15 21:48:03 +0200 | [diff] [blame] | 1499 | if (list_empty(&mgr->tx_msg_downq)) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1500 | return; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1501 | |
| 1502 | txmsg = list_first_entry(&mgr->tx_msg_downq, struct drm_dp_sideband_msg_tx, next); |
| 1503 | ret = process_single_tx_qlock(mgr, txmsg, false); |
| 1504 | if (ret == 1) { |
| 1505 | /* txmsg is sent it should be in the slots now */ |
| 1506 | list_del(&txmsg->next); |
| 1507 | } else if (ret) { |
| 1508 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
| 1509 | list_del(&txmsg->next); |
| 1510 | if (txmsg->seqno != -1) |
| 1511 | txmsg->dst->tx_slots[txmsg->seqno] = NULL; |
| 1512 | txmsg->state = DRM_DP_SIDEBAND_TX_TIMEOUT; |
| 1513 | wake_up(&mgr->tx_waitq); |
| 1514 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1515 | } |
| 1516 | |
| 1517 | /* called holding qlock */ |
Mykola Lysenko | 1f16ee7f | 2015-12-18 17:14:43 -0500 | [diff] [blame] | 1518 | static void process_single_up_tx_qlock(struct drm_dp_mst_topology_mgr *mgr, |
| 1519 | struct drm_dp_sideband_msg_tx *txmsg) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1520 | { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1521 | int ret; |
| 1522 | |
| 1523 | /* construct a chunk from the first msg in the tx_msg queue */ |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1524 | ret = process_single_tx_qlock(mgr, txmsg, true); |
Mykola Lysenko | 1f16ee7f | 2015-12-18 17:14:43 -0500 | [diff] [blame] | 1525 | |
| 1526 | if (ret != 1) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1527 | DRM_DEBUG_KMS("failed to send msg in q %d\n", ret); |
Mykola Lysenko | 1f16ee7f | 2015-12-18 17:14:43 -0500 | [diff] [blame] | 1528 | |
| 1529 | txmsg->dst->tx_slots[txmsg->seqno] = NULL; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1530 | } |
| 1531 | |
| 1532 | static void drm_dp_queue_down_tx(struct drm_dp_mst_topology_mgr *mgr, |
| 1533 | struct drm_dp_sideband_msg_tx *txmsg) |
| 1534 | { |
| 1535 | mutex_lock(&mgr->qlock); |
| 1536 | list_add_tail(&txmsg->next, &mgr->tx_msg_downq); |
Daniel Vetter | cb021a3 | 2016-07-15 21:48:03 +0200 | [diff] [blame] | 1537 | if (list_is_singular(&mgr->tx_msg_downq)) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1538 | process_single_down_tx_qlock(mgr); |
| 1539 | mutex_unlock(&mgr->qlock); |
| 1540 | } |
| 1541 | |
Dave Airlie | 68d8c9f | 2015-09-06 18:53:00 +1000 | [diff] [blame] | 1542 | static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, |
| 1543 | struct drm_dp_mst_branch *mstb) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1544 | { |
| 1545 | int len; |
| 1546 | struct drm_dp_sideband_msg_tx *txmsg; |
| 1547 | int ret; |
| 1548 | |
| 1549 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 1550 | if (!txmsg) |
Dave Airlie | 68d8c9f | 2015-09-06 18:53:00 +1000 | [diff] [blame] | 1551 | return; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1552 | |
| 1553 | txmsg->dst = mstb; |
| 1554 | len = build_link_address(txmsg); |
| 1555 | |
Dave Airlie | 68d8c9f | 2015-09-06 18:53:00 +1000 | [diff] [blame] | 1556 | mstb->link_address_sent = true; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1557 | drm_dp_queue_down_tx(mgr, txmsg); |
| 1558 | |
| 1559 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 1560 | if (ret > 0) { |
| 1561 | int i; |
| 1562 | |
| 1563 | if (txmsg->reply.reply_type == 1) |
| 1564 | DRM_DEBUG_KMS("link address nak received\n"); |
| 1565 | else { |
| 1566 | DRM_DEBUG_KMS("link address reply: %d\n", txmsg->reply.u.link_addr.nports); |
| 1567 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { |
| 1568 | 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, |
| 1569 | txmsg->reply.u.link_addr.ports[i].input_port, |
| 1570 | txmsg->reply.u.link_addr.ports[i].peer_device_type, |
| 1571 | txmsg->reply.u.link_addr.ports[i].port_number, |
| 1572 | txmsg->reply.u.link_addr.ports[i].dpcd_revision, |
| 1573 | txmsg->reply.u.link_addr.ports[i].mcs, |
| 1574 | txmsg->reply.u.link_addr.ports[i].ddps, |
| 1575 | txmsg->reply.u.link_addr.ports[i].legacy_device_plug_status, |
| 1576 | txmsg->reply.u.link_addr.ports[i].num_sdp_streams, |
| 1577 | txmsg->reply.u.link_addr.ports[i].num_sdp_stream_sinks); |
| 1578 | } |
Hersen Wu | 5e93b82 | 2016-01-22 17:07:28 -0500 | [diff] [blame] | 1579 | |
| 1580 | drm_dp_check_mstb_guid(mstb, txmsg->reply.u.link_addr.guid); |
| 1581 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1582 | for (i = 0; i < txmsg->reply.u.link_addr.nports; i++) { |
| 1583 | drm_dp_add_port(mstb, mgr->dev, &txmsg->reply.u.link_addr.ports[i]); |
| 1584 | } |
Dave Airlie | 8ae22cb | 2016-02-17 11:36:38 +1000 | [diff] [blame] | 1585 | (*mgr->cbs->hotplug)(mgr); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1586 | } |
Dave Airlie | 68d8c9f | 2015-09-06 18:53:00 +1000 | [diff] [blame] | 1587 | } else { |
| 1588 | mstb->link_address_sent = false; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1589 | DRM_DEBUG_KMS("link address failed %d\n", ret); |
Dave Airlie | 68d8c9f | 2015-09-06 18:53:00 +1000 | [diff] [blame] | 1590 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1591 | |
| 1592 | kfree(txmsg); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1593 | } |
| 1594 | |
| 1595 | static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, |
| 1596 | struct drm_dp_mst_branch *mstb, |
| 1597 | struct drm_dp_mst_port *port) |
| 1598 | { |
| 1599 | int len; |
| 1600 | struct drm_dp_sideband_msg_tx *txmsg; |
| 1601 | int ret; |
| 1602 | |
| 1603 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 1604 | if (!txmsg) |
| 1605 | return -ENOMEM; |
| 1606 | |
| 1607 | txmsg->dst = mstb; |
| 1608 | len = build_enum_path_resources(txmsg, port->port_num); |
| 1609 | |
| 1610 | drm_dp_queue_down_tx(mgr, txmsg); |
| 1611 | |
| 1612 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 1613 | if (ret > 0) { |
| 1614 | if (txmsg->reply.reply_type == 1) |
| 1615 | DRM_DEBUG_KMS("enum path resources nak received\n"); |
| 1616 | else { |
| 1617 | if (port->port_num != txmsg->reply.u.path_resources.port_number) |
| 1618 | DRM_ERROR("got incorrect port in response\n"); |
| 1619 | 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, |
| 1620 | txmsg->reply.u.path_resources.avail_payload_bw_number); |
| 1621 | port->available_pbn = txmsg->reply.u.path_resources.avail_payload_bw_number; |
| 1622 | } |
| 1623 | } |
| 1624 | |
| 1625 | kfree(txmsg); |
| 1626 | return 0; |
| 1627 | } |
| 1628 | |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 1629 | static struct drm_dp_mst_port *drm_dp_get_last_connected_port_to_mstb(struct drm_dp_mst_branch *mstb) |
| 1630 | { |
| 1631 | if (!mstb->port_parent) |
| 1632 | return NULL; |
| 1633 | |
| 1634 | if (mstb->port_parent->mstb != mstb) |
| 1635 | return mstb->port_parent; |
| 1636 | |
| 1637 | return drm_dp_get_last_connected_port_to_mstb(mstb->port_parent->parent); |
| 1638 | } |
| 1639 | |
| 1640 | static struct drm_dp_mst_branch *drm_dp_get_last_connected_port_and_mstb(struct drm_dp_mst_topology_mgr *mgr, |
| 1641 | struct drm_dp_mst_branch *mstb, |
| 1642 | int *port_num) |
| 1643 | { |
| 1644 | struct drm_dp_mst_branch *rmstb = NULL; |
| 1645 | struct drm_dp_mst_port *found_port; |
| 1646 | mutex_lock(&mgr->lock); |
| 1647 | if (mgr->mst_primary) { |
| 1648 | found_port = drm_dp_get_last_connected_port_to_mstb(mstb); |
| 1649 | |
| 1650 | if (found_port) { |
| 1651 | rmstb = found_port->parent; |
| 1652 | kref_get(&rmstb->kref); |
| 1653 | *port_num = found_port->port_num; |
| 1654 | } |
| 1655 | } |
| 1656 | mutex_unlock(&mgr->lock); |
| 1657 | return rmstb; |
| 1658 | } |
| 1659 | |
Thierry Reding | 8fa6a42 | 2014-07-21 13:23:57 +0200 | [diff] [blame] | 1660 | static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, |
| 1661 | struct drm_dp_mst_port *port, |
| 1662 | int id, |
| 1663 | int pbn) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1664 | { |
| 1665 | struct drm_dp_sideband_msg_tx *txmsg; |
| 1666 | struct drm_dp_mst_branch *mstb; |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 1667 | int len, ret, port_num; |
Libin Yang | ef8f9be | 2015-12-02 14:09:43 +0800 | [diff] [blame] | 1668 | u8 sinks[DRM_DP_MAX_SDP_STREAMS]; |
| 1669 | int i; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1670 | |
cpaul@redhat.com | deba0a2 | 2016-04-04 19:58:47 -0400 | [diff] [blame] | 1671 | port = drm_dp_get_validated_port_ref(mgr, port); |
| 1672 | if (!port) |
| 1673 | return -EINVAL; |
| 1674 | |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 1675 | port_num = port->port_num; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1676 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 1677 | if (!mstb) { |
| 1678 | mstb = drm_dp_get_last_connected_port_and_mstb(mgr, port->parent, &port_num); |
| 1679 | |
cpaul@redhat.com | deba0a2 | 2016-04-04 19:58:47 -0400 | [diff] [blame] | 1680 | if (!mstb) { |
| 1681 | drm_dp_put_port(port); |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 1682 | return -EINVAL; |
cpaul@redhat.com | deba0a2 | 2016-04-04 19:58:47 -0400 | [diff] [blame] | 1683 | } |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 1684 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1685 | |
| 1686 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 1687 | if (!txmsg) { |
| 1688 | ret = -ENOMEM; |
| 1689 | goto fail_put; |
| 1690 | } |
| 1691 | |
Libin Yang | ef8f9be | 2015-12-02 14:09:43 +0800 | [diff] [blame] | 1692 | for (i = 0; i < port->num_sdp_streams; i++) |
| 1693 | sinks[i] = i; |
| 1694 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1695 | txmsg->dst = mstb; |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 1696 | len = build_allocate_payload(txmsg, port_num, |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1697 | id, |
Libin Yang | ef8f9be | 2015-12-02 14:09:43 +0800 | [diff] [blame] | 1698 | pbn, port->num_sdp_streams, sinks); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1699 | |
| 1700 | drm_dp_queue_down_tx(mgr, txmsg); |
| 1701 | |
| 1702 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 1703 | if (ret > 0) { |
| 1704 | if (txmsg->reply.reply_type == 1) { |
| 1705 | ret = -EINVAL; |
| 1706 | } else |
| 1707 | ret = 0; |
| 1708 | } |
| 1709 | kfree(txmsg); |
| 1710 | fail_put: |
| 1711 | drm_dp_put_mst_branch_device(mstb); |
cpaul@redhat.com | deba0a2 | 2016-04-04 19:58:47 -0400 | [diff] [blame] | 1712 | drm_dp_put_port(port); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1713 | return ret; |
| 1714 | } |
| 1715 | |
| 1716 | static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
| 1717 | int id, |
| 1718 | struct drm_dp_payload *payload) |
| 1719 | { |
| 1720 | int ret; |
| 1721 | |
| 1722 | ret = drm_dp_dpcd_write_payload(mgr, id, payload); |
| 1723 | if (ret < 0) { |
| 1724 | payload->payload_state = 0; |
| 1725 | return ret; |
| 1726 | } |
| 1727 | payload->payload_state = DP_PAYLOAD_LOCAL; |
| 1728 | return 0; |
| 1729 | } |
| 1730 | |
Thierry Reding | 8fa6a42 | 2014-07-21 13:23:57 +0200 | [diff] [blame] | 1731 | static int drm_dp_create_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
| 1732 | struct drm_dp_mst_port *port, |
| 1733 | int id, |
| 1734 | struct drm_dp_payload *payload) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1735 | { |
| 1736 | int ret; |
| 1737 | ret = drm_dp_payload_send_msg(mgr, port, id, port->vcpi.pbn); |
| 1738 | if (ret < 0) |
| 1739 | return ret; |
| 1740 | payload->payload_state = DP_PAYLOAD_REMOTE; |
| 1741 | return ret; |
| 1742 | } |
| 1743 | |
Thierry Reding | 8fa6a42 | 2014-07-21 13:23:57 +0200 | [diff] [blame] | 1744 | static int drm_dp_destroy_payload_step1(struct drm_dp_mst_topology_mgr *mgr, |
| 1745 | struct drm_dp_mst_port *port, |
| 1746 | int id, |
| 1747 | struct drm_dp_payload *payload) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1748 | { |
| 1749 | DRM_DEBUG_KMS("\n"); |
| 1750 | /* its okay for these to fail */ |
| 1751 | if (port) { |
| 1752 | drm_dp_payload_send_msg(mgr, port, id, 0); |
| 1753 | } |
| 1754 | |
| 1755 | drm_dp_dpcd_write_payload(mgr, id, payload); |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 1756 | payload->payload_state = DP_PAYLOAD_DELETE_LOCAL; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1757 | return 0; |
| 1758 | } |
| 1759 | |
Thierry Reding | 8fa6a42 | 2014-07-21 13:23:57 +0200 | [diff] [blame] | 1760 | static int drm_dp_destroy_payload_step2(struct drm_dp_mst_topology_mgr *mgr, |
| 1761 | int id, |
| 1762 | struct drm_dp_payload *payload) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1763 | { |
| 1764 | payload->payload_state = 0; |
| 1765 | return 0; |
| 1766 | } |
| 1767 | |
| 1768 | /** |
| 1769 | * drm_dp_update_payload_part1() - Execute payload update part 1 |
| 1770 | * @mgr: manager to use. |
| 1771 | * |
| 1772 | * This iterates over all proposed virtual channels, and tries to |
| 1773 | * allocate space in the link for them. For 0->slots transitions, |
| 1774 | * this step just writes the VCPI to the MST device. For slots->0 |
| 1775 | * transitions, this writes the updated VCPIs and removes the |
| 1776 | * remote VC payloads. |
| 1777 | * |
| 1778 | * after calling this the driver should generate ACT and payload |
| 1779 | * packets. |
| 1780 | */ |
| 1781 | int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) |
| 1782 | { |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 1783 | int i, j; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1784 | int cur_slots = 1; |
| 1785 | struct drm_dp_payload req_payload; |
| 1786 | struct drm_dp_mst_port *port; |
| 1787 | |
| 1788 | mutex_lock(&mgr->payload_lock); |
| 1789 | for (i = 0; i < mgr->max_payloads; i++) { |
| 1790 | /* solve the current payloads - compare to the hw ones |
| 1791 | - update the hw view */ |
| 1792 | req_payload.start_slot = cur_slots; |
| 1793 | if (mgr->proposed_vcpis[i]) { |
| 1794 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
cpaul@redhat.com | 263efde | 2016-04-22 16:08:46 -0400 | [diff] [blame] | 1795 | port = drm_dp_get_validated_port_ref(mgr, port); |
| 1796 | if (!port) { |
| 1797 | mutex_unlock(&mgr->payload_lock); |
| 1798 | return -EINVAL; |
| 1799 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1800 | req_payload.num_slots = mgr->proposed_vcpis[i]->num_slots; |
Harry Wentland | 6cecdf7a | 2015-12-07 13:55:52 -0500 | [diff] [blame] | 1801 | req_payload.vcpi = mgr->proposed_vcpis[i]->vcpi; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1802 | } else { |
| 1803 | port = NULL; |
| 1804 | req_payload.num_slots = 0; |
| 1805 | } |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 1806 | |
| 1807 | if (mgr->payloads[i].start_slot != req_payload.start_slot) { |
| 1808 | mgr->payloads[i].start_slot = req_payload.start_slot; |
| 1809 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1810 | /* work out what is required to happen with this payload */ |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 1811 | if (mgr->payloads[i].num_slots != req_payload.num_slots) { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1812 | |
| 1813 | /* need to push an update for this payload */ |
| 1814 | if (req_payload.num_slots) { |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 1815 | drm_dp_create_payload_step1(mgr, mgr->proposed_vcpis[i]->vcpi, &req_payload); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1816 | mgr->payloads[i].num_slots = req_payload.num_slots; |
Harry Wentland | 6cecdf7a | 2015-12-07 13:55:52 -0500 | [diff] [blame] | 1817 | mgr->payloads[i].vcpi = req_payload.vcpi; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1818 | } else if (mgr->payloads[i].num_slots) { |
| 1819 | mgr->payloads[i].num_slots = 0; |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 1820 | drm_dp_destroy_payload_step1(mgr, port, port->vcpi.vcpi, &mgr->payloads[i]); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1821 | req_payload.payload_state = mgr->payloads[i].payload_state; |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 1822 | mgr->payloads[i].start_slot = 0; |
| 1823 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1824 | mgr->payloads[i].payload_state = req_payload.payload_state; |
| 1825 | } |
| 1826 | cur_slots += req_payload.num_slots; |
cpaul@redhat.com | 263efde | 2016-04-22 16:08:46 -0400 | [diff] [blame] | 1827 | |
| 1828 | if (port) |
| 1829 | drm_dp_put_port(port); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1830 | } |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 1831 | |
| 1832 | for (i = 0; i < mgr->max_payloads; i++) { |
| 1833 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { |
| 1834 | DRM_DEBUG_KMS("removing payload %d\n", i); |
| 1835 | for (j = i; j < mgr->max_payloads - 1; j++) { |
| 1836 | memcpy(&mgr->payloads[j], &mgr->payloads[j + 1], sizeof(struct drm_dp_payload)); |
| 1837 | mgr->proposed_vcpis[j] = mgr->proposed_vcpis[j + 1]; |
| 1838 | if (mgr->proposed_vcpis[j] && mgr->proposed_vcpis[j]->num_slots) { |
| 1839 | set_bit(j + 1, &mgr->payload_mask); |
| 1840 | } else { |
| 1841 | clear_bit(j + 1, &mgr->payload_mask); |
| 1842 | } |
| 1843 | } |
| 1844 | memset(&mgr->payloads[mgr->max_payloads - 1], 0, sizeof(struct drm_dp_payload)); |
| 1845 | mgr->proposed_vcpis[mgr->max_payloads - 1] = NULL; |
| 1846 | clear_bit(mgr->max_payloads, &mgr->payload_mask); |
| 1847 | |
| 1848 | } |
| 1849 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1850 | mutex_unlock(&mgr->payload_lock); |
| 1851 | |
| 1852 | return 0; |
| 1853 | } |
| 1854 | EXPORT_SYMBOL(drm_dp_update_payload_part1); |
| 1855 | |
| 1856 | /** |
| 1857 | * drm_dp_update_payload_part2() - Execute payload update part 2 |
| 1858 | * @mgr: manager to use. |
| 1859 | * |
| 1860 | * This iterates over all proposed virtual channels, and tries to |
| 1861 | * allocate space in the link for them. For 0->slots transitions, |
| 1862 | * this step writes the remote VC payload commands. For slots->0 |
| 1863 | * this just resets some internal state. |
| 1864 | */ |
| 1865 | int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr) |
| 1866 | { |
| 1867 | struct drm_dp_mst_port *port; |
| 1868 | int i; |
Damien Lespiau | 7389ad4 | 2014-07-14 11:53:44 +0100 | [diff] [blame] | 1869 | int ret = 0; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1870 | mutex_lock(&mgr->payload_lock); |
| 1871 | for (i = 0; i < mgr->max_payloads; i++) { |
| 1872 | |
| 1873 | if (!mgr->proposed_vcpis[i]) |
| 1874 | continue; |
| 1875 | |
| 1876 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
| 1877 | |
| 1878 | DRM_DEBUG_KMS("payload %d %d\n", i, mgr->payloads[i].payload_state); |
| 1879 | if (mgr->payloads[i].payload_state == DP_PAYLOAD_LOCAL) { |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 1880 | ret = drm_dp_create_payload_step2(mgr, port, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1881 | } else if (mgr->payloads[i].payload_state == DP_PAYLOAD_DELETE_LOCAL) { |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 1882 | ret = drm_dp_destroy_payload_step2(mgr, mgr->proposed_vcpis[i]->vcpi, &mgr->payloads[i]); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1883 | } |
| 1884 | if (ret) { |
| 1885 | mutex_unlock(&mgr->payload_lock); |
| 1886 | return ret; |
| 1887 | } |
| 1888 | } |
| 1889 | mutex_unlock(&mgr->payload_lock); |
| 1890 | return 0; |
| 1891 | } |
| 1892 | EXPORT_SYMBOL(drm_dp_update_payload_part2); |
| 1893 | |
| 1894 | #if 0 /* unused as of yet */ |
| 1895 | static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, |
| 1896 | struct drm_dp_mst_port *port, |
| 1897 | int offset, int size) |
| 1898 | { |
| 1899 | int len; |
| 1900 | struct drm_dp_sideband_msg_tx *txmsg; |
| 1901 | |
| 1902 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 1903 | if (!txmsg) |
| 1904 | return -ENOMEM; |
| 1905 | |
| 1906 | len = build_dpcd_read(txmsg, port->port_num, 0, 8); |
| 1907 | txmsg->dst = port->parent; |
| 1908 | |
| 1909 | drm_dp_queue_down_tx(mgr, txmsg); |
| 1910 | |
| 1911 | return 0; |
| 1912 | } |
| 1913 | #endif |
| 1914 | |
| 1915 | static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, |
| 1916 | struct drm_dp_mst_port *port, |
| 1917 | int offset, int size, u8 *bytes) |
| 1918 | { |
| 1919 | int len; |
| 1920 | int ret; |
| 1921 | struct drm_dp_sideband_msg_tx *txmsg; |
| 1922 | struct drm_dp_mst_branch *mstb; |
| 1923 | |
| 1924 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
| 1925 | if (!mstb) |
| 1926 | return -EINVAL; |
| 1927 | |
| 1928 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 1929 | if (!txmsg) { |
| 1930 | ret = -ENOMEM; |
| 1931 | goto fail_put; |
| 1932 | } |
| 1933 | |
| 1934 | len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); |
| 1935 | txmsg->dst = mstb; |
| 1936 | |
| 1937 | drm_dp_queue_down_tx(mgr, txmsg); |
| 1938 | |
| 1939 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 1940 | if (ret > 0) { |
| 1941 | if (txmsg->reply.reply_type == 1) { |
| 1942 | ret = -EINVAL; |
| 1943 | } else |
| 1944 | ret = 0; |
| 1945 | } |
| 1946 | kfree(txmsg); |
| 1947 | fail_put: |
| 1948 | drm_dp_put_mst_branch_device(mstb); |
| 1949 | return ret; |
| 1950 | } |
| 1951 | |
| 1952 | static int drm_dp_encode_up_ack_reply(struct drm_dp_sideband_msg_tx *msg, u8 req_type) |
| 1953 | { |
| 1954 | struct drm_dp_sideband_msg_reply_body reply; |
| 1955 | |
Mykola Lysenko | a68d243 | 2015-12-07 13:55:51 -0500 | [diff] [blame] | 1956 | reply.reply_type = 0; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1957 | reply.req_type = req_type; |
| 1958 | drm_dp_encode_sideband_reply(&reply, msg); |
| 1959 | return 0; |
| 1960 | } |
| 1961 | |
| 1962 | static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr, |
| 1963 | struct drm_dp_mst_branch *mstb, |
| 1964 | int req_type, int seqno, bool broadcast) |
| 1965 | { |
| 1966 | struct drm_dp_sideband_msg_tx *txmsg; |
| 1967 | |
| 1968 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 1969 | if (!txmsg) |
| 1970 | return -ENOMEM; |
| 1971 | |
| 1972 | txmsg->dst = mstb; |
| 1973 | txmsg->seqno = seqno; |
| 1974 | drm_dp_encode_up_ack_reply(txmsg, req_type); |
| 1975 | |
| 1976 | mutex_lock(&mgr->qlock); |
Mykola Lysenko | 1f16ee7f | 2015-12-18 17:14:43 -0500 | [diff] [blame] | 1977 | |
| 1978 | process_single_up_tx_qlock(mgr, txmsg); |
| 1979 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1980 | mutex_unlock(&mgr->qlock); |
Mykola Lysenko | 1f16ee7f | 2015-12-18 17:14:43 -0500 | [diff] [blame] | 1981 | |
| 1982 | kfree(txmsg); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1983 | return 0; |
| 1984 | } |
| 1985 | |
Chris Wilson | b853fdb | 2014-11-12 10:13:37 +0000 | [diff] [blame] | 1986 | static bool drm_dp_get_vc_payload_bw(int dp_link_bw, |
| 1987 | int dp_link_count, |
| 1988 | int *out) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1989 | { |
| 1990 | switch (dp_link_bw) { |
Chris Wilson | b853fdb | 2014-11-12 10:13:37 +0000 | [diff] [blame] | 1991 | default: |
| 1992 | DRM_DEBUG_KMS("invalid link bandwidth in DPCD: %x (link count: %d)\n", |
| 1993 | dp_link_bw, dp_link_count); |
| 1994 | return false; |
| 1995 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1996 | case DP_LINK_BW_1_62: |
Chris Wilson | b853fdb | 2014-11-12 10:13:37 +0000 | [diff] [blame] | 1997 | *out = 3 * dp_link_count; |
| 1998 | break; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 1999 | case DP_LINK_BW_2_7: |
Chris Wilson | b853fdb | 2014-11-12 10:13:37 +0000 | [diff] [blame] | 2000 | *out = 5 * dp_link_count; |
| 2001 | break; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2002 | case DP_LINK_BW_5_4: |
Chris Wilson | b853fdb | 2014-11-12 10:13:37 +0000 | [diff] [blame] | 2003 | *out = 10 * dp_link_count; |
| 2004 | break; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2005 | } |
Chris Wilson | b853fdb | 2014-11-12 10:13:37 +0000 | [diff] [blame] | 2006 | return true; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2007 | } |
| 2008 | |
| 2009 | /** |
| 2010 | * drm_dp_mst_topology_mgr_set_mst() - Set the MST state for a topology manager |
| 2011 | * @mgr: manager to set state for |
| 2012 | * @mst_state: true to enable MST on this connector - false to disable. |
| 2013 | * |
| 2014 | * This is called by the driver when it detects an MST capable device plugged |
| 2015 | * into a DP MST capable port, or when a DP MST capable device is unplugged. |
| 2016 | */ |
| 2017 | int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state) |
| 2018 | { |
| 2019 | int ret = 0; |
| 2020 | struct drm_dp_mst_branch *mstb = NULL; |
| 2021 | |
| 2022 | mutex_lock(&mgr->lock); |
| 2023 | if (mst_state == mgr->mst_state) |
| 2024 | goto out_unlock; |
| 2025 | |
| 2026 | mgr->mst_state = mst_state; |
| 2027 | /* set the device into MST mode */ |
| 2028 | if (mst_state) { |
| 2029 | WARN_ON(mgr->mst_primary); |
| 2030 | |
| 2031 | /* get dpcd info */ |
| 2032 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); |
| 2033 | if (ret != DP_RECEIVER_CAP_SIZE) { |
| 2034 | DRM_DEBUG_KMS("failed to read DPCD\n"); |
| 2035 | goto out_unlock; |
| 2036 | } |
| 2037 | |
Chris Wilson | b853fdb | 2014-11-12 10:13:37 +0000 | [diff] [blame] | 2038 | if (!drm_dp_get_vc_payload_bw(mgr->dpcd[1], |
| 2039 | mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, |
| 2040 | &mgr->pbn_div)) { |
| 2041 | ret = -EINVAL; |
| 2042 | goto out_unlock; |
| 2043 | } |
| 2044 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2045 | mgr->total_pbn = 2560; |
| 2046 | mgr->total_slots = DIV_ROUND_UP(mgr->total_pbn, mgr->pbn_div); |
| 2047 | mgr->avail_slots = mgr->total_slots; |
| 2048 | |
| 2049 | /* add initial branch device at LCT 1 */ |
| 2050 | mstb = drm_dp_add_mst_branch_device(1, NULL); |
| 2051 | if (mstb == NULL) { |
| 2052 | ret = -ENOMEM; |
| 2053 | goto out_unlock; |
| 2054 | } |
| 2055 | mstb->mgr = mgr; |
| 2056 | |
| 2057 | /* give this the main reference */ |
| 2058 | mgr->mst_primary = mstb; |
| 2059 | kref_get(&mgr->mst_primary->kref); |
| 2060 | |
Andrey Grodzovsky | c175cd1 | 2016-01-22 17:07:29 -0500 | [diff] [blame] | 2061 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
| 2062 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); |
| 2063 | if (ret < 0) { |
| 2064 | goto out_unlock; |
| 2065 | } |
| 2066 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2067 | { |
| 2068 | struct drm_dp_payload reset_pay; |
| 2069 | reset_pay.start_slot = 0; |
| 2070 | reset_pay.num_slots = 0x3f; |
| 2071 | drm_dp_dpcd_write_payload(mgr, 0, &reset_pay); |
| 2072 | } |
| 2073 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2074 | queue_work(system_long_wq, &mgr->work); |
| 2075 | |
| 2076 | ret = 0; |
| 2077 | } else { |
| 2078 | /* disable MST on the device */ |
| 2079 | mstb = mgr->mst_primary; |
| 2080 | mgr->mst_primary = NULL; |
| 2081 | /* this can fail if the device is gone */ |
| 2082 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); |
| 2083 | ret = 0; |
| 2084 | memset(mgr->payloads, 0, mgr->max_payloads * sizeof(struct drm_dp_payload)); |
| 2085 | mgr->payload_mask = 0; |
| 2086 | set_bit(0, &mgr->payload_mask); |
Dave Airlie | dfda0df | 2014-08-06 16:26:21 +1000 | [diff] [blame] | 2087 | mgr->vcpi_mask = 0; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2088 | } |
| 2089 | |
| 2090 | out_unlock: |
| 2091 | mutex_unlock(&mgr->lock); |
| 2092 | if (mstb) |
| 2093 | drm_dp_put_mst_branch_device(mstb); |
| 2094 | return ret; |
| 2095 | |
| 2096 | } |
| 2097 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_set_mst); |
| 2098 | |
| 2099 | /** |
| 2100 | * drm_dp_mst_topology_mgr_suspend() - suspend the MST manager |
| 2101 | * @mgr: manager to suspend |
| 2102 | * |
| 2103 | * This function tells the MST device that we can't handle UP messages |
| 2104 | * anymore. This should stop it from sending any since we are suspended. |
| 2105 | */ |
| 2106 | void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr) |
| 2107 | { |
| 2108 | mutex_lock(&mgr->lock); |
| 2109 | drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
| 2110 | DP_MST_EN | DP_UPSTREAM_IS_SRC); |
| 2111 | mutex_unlock(&mgr->lock); |
Dave Airlie | 274d835 | 2015-09-30 10:39:42 +1000 | [diff] [blame] | 2112 | flush_work(&mgr->work); |
| 2113 | flush_work(&mgr->destroy_connector_work); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2114 | } |
| 2115 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend); |
| 2116 | |
| 2117 | /** |
| 2118 | * drm_dp_mst_topology_mgr_resume() - resume the MST manager |
| 2119 | * @mgr: manager to resume |
| 2120 | * |
| 2121 | * This will fetch DPCD and see if the device is still there, |
| 2122 | * if it is, it will rewrite the MSTM control bits, and return. |
| 2123 | * |
| 2124 | * if the device fails this returns -1, and the driver should do |
| 2125 | * a full MST reprobe, in case we were undocked. |
| 2126 | */ |
| 2127 | int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr) |
| 2128 | { |
| 2129 | int ret = 0; |
| 2130 | |
| 2131 | mutex_lock(&mgr->lock); |
| 2132 | |
| 2133 | if (mgr->mst_primary) { |
| 2134 | int sret; |
Lyude | 1652fce | 2016-04-13 16:50:18 -0400 | [diff] [blame] | 2135 | u8 guid[16]; |
| 2136 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2137 | sret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE); |
| 2138 | if (sret != DP_RECEIVER_CAP_SIZE) { |
| 2139 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); |
| 2140 | ret = -1; |
| 2141 | goto out_unlock; |
| 2142 | } |
| 2143 | |
| 2144 | ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, |
| 2145 | DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC); |
| 2146 | if (ret < 0) { |
| 2147 | DRM_DEBUG_KMS("mst write failed - undocked during suspend?\n"); |
| 2148 | ret = -1; |
| 2149 | goto out_unlock; |
| 2150 | } |
Lyude | 1652fce | 2016-04-13 16:50:18 -0400 | [diff] [blame] | 2151 | |
| 2152 | /* Some hubs forget their guids after they resume */ |
| 2153 | sret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16); |
| 2154 | if (sret != 16) { |
| 2155 | DRM_DEBUG_KMS("dpcd read failed - undocked during suspend?\n"); |
| 2156 | ret = -1; |
| 2157 | goto out_unlock; |
| 2158 | } |
| 2159 | drm_dp_check_mstb_guid(mgr->mst_primary, guid); |
| 2160 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2161 | ret = 0; |
| 2162 | } else |
| 2163 | ret = -1; |
| 2164 | |
| 2165 | out_unlock: |
| 2166 | mutex_unlock(&mgr->lock); |
| 2167 | return ret; |
| 2168 | } |
| 2169 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_resume); |
| 2170 | |
| 2171 | static void drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) |
| 2172 | { |
| 2173 | int len; |
| 2174 | u8 replyblock[32]; |
| 2175 | int replylen, origlen, curreply; |
| 2176 | int ret; |
| 2177 | struct drm_dp_sideband_msg_rx *msg; |
| 2178 | int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; |
| 2179 | msg = up ? &mgr->up_req_recv : &mgr->down_rep_recv; |
| 2180 | |
| 2181 | len = min(mgr->max_dpcd_transaction_bytes, 16); |
| 2182 | ret = drm_dp_dpcd_read(mgr->aux, basereg, |
| 2183 | replyblock, len); |
| 2184 | if (ret != len) { |
| 2185 | DRM_DEBUG_KMS("failed to read DPCD down rep %d %d\n", len, ret); |
| 2186 | return; |
| 2187 | } |
| 2188 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, true); |
| 2189 | if (!ret) { |
| 2190 | DRM_DEBUG_KMS("sideband msg build failed %d\n", replyblock[0]); |
| 2191 | return; |
| 2192 | } |
| 2193 | replylen = msg->curchunk_len + msg->curchunk_hdrlen; |
| 2194 | |
| 2195 | origlen = replylen; |
| 2196 | replylen -= len; |
| 2197 | curreply = len; |
| 2198 | while (replylen > 0) { |
| 2199 | len = min3(replylen, mgr->max_dpcd_transaction_bytes, 16); |
| 2200 | ret = drm_dp_dpcd_read(mgr->aux, basereg + curreply, |
| 2201 | replyblock, len); |
| 2202 | if (ret != len) { |
| 2203 | DRM_DEBUG_KMS("failed to read a chunk\n"); |
| 2204 | } |
| 2205 | ret = drm_dp_sideband_msg_build(msg, replyblock, len, false); |
| 2206 | if (ret == false) |
| 2207 | DRM_DEBUG_KMS("failed to build sideband msg\n"); |
| 2208 | curreply += len; |
| 2209 | replylen -= len; |
| 2210 | } |
| 2211 | } |
| 2212 | |
| 2213 | static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) |
| 2214 | { |
| 2215 | int ret = 0; |
| 2216 | |
| 2217 | drm_dp_get_one_sb_msg(mgr, false); |
| 2218 | |
| 2219 | if (mgr->down_rep_recv.have_eomt) { |
| 2220 | struct drm_dp_sideband_msg_tx *txmsg; |
| 2221 | struct drm_dp_mst_branch *mstb; |
| 2222 | int slot = -1; |
| 2223 | mstb = drm_dp_get_mst_branch_device(mgr, |
| 2224 | mgr->down_rep_recv.initial_hdr.lct, |
| 2225 | mgr->down_rep_recv.initial_hdr.rad); |
| 2226 | |
| 2227 | if (!mstb) { |
| 2228 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->down_rep_recv.initial_hdr.lct); |
| 2229 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
| 2230 | return 0; |
| 2231 | } |
| 2232 | |
| 2233 | /* find the message */ |
| 2234 | slot = mgr->down_rep_recv.initial_hdr.seqno; |
| 2235 | mutex_lock(&mgr->qlock); |
| 2236 | txmsg = mstb->tx_slots[slot]; |
| 2237 | /* remove from slots */ |
| 2238 | mutex_unlock(&mgr->qlock); |
| 2239 | |
| 2240 | if (!txmsg) { |
| 2241 | DRM_DEBUG_KMS("Got MST reply with no msg %p %d %d %02x %02x\n", |
| 2242 | mstb, |
| 2243 | mgr->down_rep_recv.initial_hdr.seqno, |
| 2244 | mgr->down_rep_recv.initial_hdr.lct, |
| 2245 | mgr->down_rep_recv.initial_hdr.rad[0], |
| 2246 | mgr->down_rep_recv.msg[0]); |
| 2247 | drm_dp_put_mst_branch_device(mstb); |
| 2248 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
| 2249 | return 0; |
| 2250 | } |
| 2251 | |
| 2252 | drm_dp_sideband_parse_reply(&mgr->down_rep_recv, &txmsg->reply); |
| 2253 | if (txmsg->reply.reply_type == 1) { |
| 2254 | 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); |
| 2255 | } |
| 2256 | |
| 2257 | memset(&mgr->down_rep_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
| 2258 | drm_dp_put_mst_branch_device(mstb); |
| 2259 | |
| 2260 | mutex_lock(&mgr->qlock); |
| 2261 | txmsg->state = DRM_DP_SIDEBAND_TX_RX; |
| 2262 | mstb->tx_slots[slot] = NULL; |
| 2263 | mutex_unlock(&mgr->qlock); |
| 2264 | |
| 2265 | wake_up(&mgr->tx_waitq); |
| 2266 | } |
| 2267 | return ret; |
| 2268 | } |
| 2269 | |
| 2270 | static int drm_dp_mst_handle_up_req(struct drm_dp_mst_topology_mgr *mgr) |
| 2271 | { |
| 2272 | int ret = 0; |
| 2273 | drm_dp_get_one_sb_msg(mgr, true); |
| 2274 | |
| 2275 | if (mgr->up_req_recv.have_eomt) { |
| 2276 | struct drm_dp_sideband_msg_req_body msg; |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2277 | struct drm_dp_mst_branch *mstb = NULL; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2278 | bool seqno; |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2279 | |
| 2280 | if (!mgr->up_req_recv.initial_hdr.broadcast) { |
| 2281 | mstb = drm_dp_get_mst_branch_device(mgr, |
| 2282 | mgr->up_req_recv.initial_hdr.lct, |
| 2283 | mgr->up_req_recv.initial_hdr.rad); |
| 2284 | if (!mstb) { |
| 2285 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); |
| 2286 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
| 2287 | return 0; |
| 2288 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2289 | } |
| 2290 | |
| 2291 | seqno = mgr->up_req_recv.initial_hdr.seqno; |
| 2292 | drm_dp_sideband_parse_req(&mgr->up_req_recv, &msg); |
| 2293 | |
| 2294 | if (msg.req_type == DP_CONNECTION_STATUS_NOTIFY) { |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2295 | drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); |
| 2296 | |
| 2297 | if (!mstb) |
| 2298 | mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.conn_stat.guid); |
| 2299 | |
| 2300 | if (!mstb) { |
| 2301 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); |
| 2302 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
| 2303 | return 0; |
| 2304 | } |
| 2305 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2306 | drm_dp_update_port(mstb, &msg.u.conn_stat); |
Hersen Wu | 5e93b82 | 2016-01-22 17:07:28 -0500 | [diff] [blame] | 2307 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2308 | 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); |
Dave Airlie | 8ae22cb | 2016-02-17 11:36:38 +1000 | [diff] [blame] | 2309 | (*mgr->cbs->hotplug)(mgr); |
| 2310 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2311 | } else if (msg.req_type == DP_RESOURCE_STATUS_NOTIFY) { |
Mykola Lysenko | bd93432 | 2015-12-18 17:14:42 -0500 | [diff] [blame] | 2312 | drm_dp_send_up_ack_reply(mgr, mgr->mst_primary, msg.req_type, seqno, false); |
| 2313 | if (!mstb) |
| 2314 | mstb = drm_dp_get_mst_branch_device_by_guid(mgr, msg.u.resource_stat.guid); |
| 2315 | |
| 2316 | if (!mstb) { |
| 2317 | DRM_DEBUG_KMS("Got MST reply from unknown device %d\n", mgr->up_req_recv.initial_hdr.lct); |
| 2318 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
| 2319 | return 0; |
| 2320 | } |
| 2321 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2322 | DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n", msg.u.resource_stat.port_number, msg.u.resource_stat.available_pbn); |
| 2323 | } |
| 2324 | |
| 2325 | drm_dp_put_mst_branch_device(mstb); |
| 2326 | memset(&mgr->up_req_recv, 0, sizeof(struct drm_dp_sideband_msg_rx)); |
| 2327 | } |
| 2328 | return ret; |
| 2329 | } |
| 2330 | |
| 2331 | /** |
| 2332 | * drm_dp_mst_hpd_irq() - MST hotplug IRQ notify |
| 2333 | * @mgr: manager to notify irq for. |
| 2334 | * @esi: 4 bytes from SINK_COUNT_ESI |
Daniel Vetter | 295ee85 | 2014-07-30 14:23:44 +0200 | [diff] [blame] | 2335 | * @handled: whether the hpd interrupt was consumed or not |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2336 | * |
| 2337 | * This should be called from the driver when it detects a short IRQ, |
| 2338 | * along with the value of the DEVICE_SERVICE_IRQ_VECTOR_ESI0. The |
| 2339 | * topology manager will process the sideband messages received as a result |
| 2340 | * of this. |
| 2341 | */ |
| 2342 | int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled) |
| 2343 | { |
| 2344 | int ret = 0; |
| 2345 | int sc; |
| 2346 | *handled = false; |
| 2347 | sc = esi[0] & 0x3f; |
| 2348 | |
| 2349 | if (sc != mgr->sink_count) { |
| 2350 | mgr->sink_count = sc; |
| 2351 | *handled = true; |
| 2352 | } |
| 2353 | |
| 2354 | if (esi[1] & DP_DOWN_REP_MSG_RDY) { |
| 2355 | ret = drm_dp_mst_handle_down_rep(mgr); |
| 2356 | *handled = true; |
| 2357 | } |
| 2358 | |
| 2359 | if (esi[1] & DP_UP_REQ_MSG_RDY) { |
| 2360 | ret |= drm_dp_mst_handle_up_req(mgr); |
| 2361 | *handled = true; |
| 2362 | } |
| 2363 | |
| 2364 | drm_dp_mst_kick_tx(mgr); |
| 2365 | return ret; |
| 2366 | } |
| 2367 | EXPORT_SYMBOL(drm_dp_mst_hpd_irq); |
| 2368 | |
| 2369 | /** |
| 2370 | * drm_dp_mst_detect_port() - get connection status for an MST port |
Daniel Vetter | 132d49d | 2016-07-15 21:48:04 +0200 | [diff] [blame] | 2371 | * @connector: DRM connector for this port |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2372 | * @mgr: manager for this port |
| 2373 | * @port: unverified pointer to a port |
| 2374 | * |
| 2375 | * This returns the current connection state for a port. It validates the |
| 2376 | * port pointer still exists so the caller doesn't require a reference |
| 2377 | */ |
Dave Airlie | c6a0aed | 2014-10-20 16:28:02 +1000 | [diff] [blame] | 2378 | enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, |
| 2379 | struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2380 | { |
| 2381 | enum drm_connector_status status = connector_status_disconnected; |
| 2382 | |
| 2383 | /* we need to search for the port in the mgr in case its gone */ |
| 2384 | port = drm_dp_get_validated_port_ref(mgr, port); |
| 2385 | if (!port) |
| 2386 | return connector_status_disconnected; |
| 2387 | |
| 2388 | if (!port->ddps) |
| 2389 | goto out; |
| 2390 | |
| 2391 | switch (port->pdt) { |
| 2392 | case DP_PEER_DEVICE_NONE: |
| 2393 | case DP_PEER_DEVICE_MST_BRANCHING: |
| 2394 | break; |
| 2395 | |
| 2396 | case DP_PEER_DEVICE_SST_SINK: |
| 2397 | status = connector_status_connected; |
Dave Airlie | 8ae22cb | 2016-02-17 11:36:38 +1000 | [diff] [blame] | 2398 | /* for logical ports - cache the EDID */ |
| 2399 | if (port->port_num >= 8 && !port->cached_edid) { |
| 2400 | port->cached_edid = drm_get_edid(connector, &port->aux.ddc); |
| 2401 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2402 | break; |
| 2403 | case DP_PEER_DEVICE_DP_LEGACY_CONV: |
| 2404 | if (port->ldps) |
| 2405 | status = connector_status_connected; |
| 2406 | break; |
| 2407 | } |
| 2408 | out: |
| 2409 | drm_dp_put_port(port); |
| 2410 | return status; |
| 2411 | } |
| 2412 | EXPORT_SYMBOL(drm_dp_mst_detect_port); |
| 2413 | |
| 2414 | /** |
Libin Yang | ef8f9be | 2015-12-02 14:09:43 +0800 | [diff] [blame] | 2415 | * drm_dp_mst_port_has_audio() - Check whether port has audio capability or not |
| 2416 | * @mgr: manager for this port |
| 2417 | * @port: unverified pointer to a port. |
| 2418 | * |
| 2419 | * This returns whether the port supports audio or not. |
| 2420 | */ |
| 2421 | bool drm_dp_mst_port_has_audio(struct drm_dp_mst_topology_mgr *mgr, |
| 2422 | struct drm_dp_mst_port *port) |
| 2423 | { |
| 2424 | bool ret = false; |
| 2425 | |
| 2426 | port = drm_dp_get_validated_port_ref(mgr, port); |
| 2427 | if (!port) |
| 2428 | return ret; |
| 2429 | ret = port->has_audio; |
| 2430 | drm_dp_put_port(port); |
| 2431 | return ret; |
| 2432 | } |
| 2433 | EXPORT_SYMBOL(drm_dp_mst_port_has_audio); |
| 2434 | |
| 2435 | /** |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2436 | * drm_dp_mst_get_edid() - get EDID for an MST port |
| 2437 | * @connector: toplevel connector to get EDID for |
| 2438 | * @mgr: manager for this port |
| 2439 | * @port: unverified pointer to a port. |
| 2440 | * |
| 2441 | * This returns an EDID for the port connected to a connector, |
| 2442 | * It validates the pointer still exists so the caller doesn't require a |
| 2443 | * reference. |
| 2444 | */ |
| 2445 | struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
| 2446 | { |
| 2447 | struct edid *edid = NULL; |
| 2448 | |
| 2449 | /* we need to search for the port in the mgr in case its gone */ |
| 2450 | port = drm_dp_get_validated_port_ref(mgr, port); |
| 2451 | if (!port) |
| 2452 | return NULL; |
| 2453 | |
Dave Airlie | c6a0aed | 2014-10-20 16:28:02 +1000 | [diff] [blame] | 2454 | if (port->cached_edid) |
| 2455 | edid = drm_edid_duplicate(port->cached_edid); |
Dave Airlie | 8ae22cb | 2016-02-17 11:36:38 +1000 | [diff] [blame] | 2456 | else { |
| 2457 | edid = drm_get_edid(connector, &port->aux.ddc); |
| 2458 | drm_mode_connector_set_tile_property(connector); |
| 2459 | } |
Libin Yang | ef8f9be | 2015-12-02 14:09:43 +0800 | [diff] [blame] | 2460 | port->has_audio = drm_detect_monitor_audio(edid); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2461 | drm_dp_put_port(port); |
| 2462 | return edid; |
| 2463 | } |
| 2464 | EXPORT_SYMBOL(drm_dp_mst_get_edid); |
| 2465 | |
| 2466 | /** |
| 2467 | * drm_dp_find_vcpi_slots() - find slots for this PBN value |
| 2468 | * @mgr: manager to use |
| 2469 | * @pbn: payload bandwidth to convert into slots. |
| 2470 | */ |
| 2471 | int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, |
| 2472 | int pbn) |
| 2473 | { |
| 2474 | int num_slots; |
| 2475 | |
| 2476 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); |
| 2477 | |
| 2478 | if (num_slots > mgr->avail_slots) |
| 2479 | return -ENOSPC; |
| 2480 | return num_slots; |
| 2481 | } |
| 2482 | EXPORT_SYMBOL(drm_dp_find_vcpi_slots); |
| 2483 | |
| 2484 | static int drm_dp_init_vcpi(struct drm_dp_mst_topology_mgr *mgr, |
| 2485 | struct drm_dp_vcpi *vcpi, int pbn) |
| 2486 | { |
| 2487 | int num_slots; |
| 2488 | int ret; |
| 2489 | |
| 2490 | num_slots = DIV_ROUND_UP(pbn, mgr->pbn_div); |
| 2491 | |
| 2492 | if (num_slots > mgr->avail_slots) |
| 2493 | return -ENOSPC; |
| 2494 | |
| 2495 | vcpi->pbn = pbn; |
| 2496 | vcpi->aligned_pbn = num_slots * mgr->pbn_div; |
| 2497 | vcpi->num_slots = num_slots; |
| 2498 | |
| 2499 | ret = drm_dp_mst_assign_payload_id(mgr, vcpi); |
| 2500 | if (ret < 0) |
| 2501 | return ret; |
| 2502 | return 0; |
| 2503 | } |
| 2504 | |
| 2505 | /** |
| 2506 | * drm_dp_mst_allocate_vcpi() - Allocate a virtual channel |
| 2507 | * @mgr: manager for this port |
| 2508 | * @port: port to allocate a virtual channel for. |
| 2509 | * @pbn: payload bandwidth number to request |
| 2510 | * @slots: returned number of slots for this PBN. |
| 2511 | */ |
| 2512 | bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots) |
| 2513 | { |
| 2514 | int ret; |
| 2515 | |
| 2516 | port = drm_dp_get_validated_port_ref(mgr, port); |
| 2517 | if (!port) |
| 2518 | return false; |
| 2519 | |
| 2520 | if (port->vcpi.vcpi > 0) { |
| 2521 | DRM_DEBUG_KMS("payload: vcpi %d already allocated for pbn %d - requested pbn %d\n", port->vcpi.vcpi, port->vcpi.pbn, pbn); |
| 2522 | if (pbn == port->vcpi.pbn) { |
| 2523 | *slots = port->vcpi.num_slots; |
Insu Yun | dabe195 | 2016-02-01 11:08:29 -0500 | [diff] [blame] | 2524 | drm_dp_put_port(port); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2525 | return true; |
| 2526 | } |
| 2527 | } |
| 2528 | |
| 2529 | ret = drm_dp_init_vcpi(mgr, &port->vcpi, pbn); |
| 2530 | if (ret) { |
| 2531 | DRM_DEBUG_KMS("failed to init vcpi %d %d %d\n", DIV_ROUND_UP(pbn, mgr->pbn_div), mgr->avail_slots, ret); |
| 2532 | goto out; |
| 2533 | } |
| 2534 | DRM_DEBUG_KMS("initing vcpi for %d %d\n", pbn, port->vcpi.num_slots); |
| 2535 | *slots = port->vcpi.num_slots; |
| 2536 | |
| 2537 | drm_dp_put_port(port); |
| 2538 | return true; |
| 2539 | out: |
| 2540 | return false; |
| 2541 | } |
| 2542 | EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi); |
| 2543 | |
Dave Airlie | 87f5942 | 2015-02-24 09:23:55 +1000 | [diff] [blame] | 2544 | int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
| 2545 | { |
| 2546 | int slots = 0; |
| 2547 | port = drm_dp_get_validated_port_ref(mgr, port); |
| 2548 | if (!port) |
| 2549 | return slots; |
| 2550 | |
| 2551 | slots = port->vcpi.num_slots; |
| 2552 | drm_dp_put_port(port); |
| 2553 | return slots; |
| 2554 | } |
| 2555 | EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots); |
| 2556 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2557 | /** |
| 2558 | * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI |
| 2559 | * @mgr: manager for this port |
| 2560 | * @port: unverified pointer to a port. |
| 2561 | * |
| 2562 | * This just resets the number of slots for the ports VCPI for later programming. |
| 2563 | */ |
| 2564 | void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
| 2565 | { |
| 2566 | port = drm_dp_get_validated_port_ref(mgr, port); |
| 2567 | if (!port) |
| 2568 | return; |
| 2569 | port->vcpi.num_slots = 0; |
| 2570 | drm_dp_put_port(port); |
| 2571 | } |
| 2572 | EXPORT_SYMBOL(drm_dp_mst_reset_vcpi_slots); |
| 2573 | |
| 2574 | /** |
| 2575 | * drm_dp_mst_deallocate_vcpi() - deallocate a VCPI |
| 2576 | * @mgr: manager for this port |
| 2577 | * @port: unverified port to deallocate vcpi for |
| 2578 | */ |
| 2579 | void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port) |
| 2580 | { |
| 2581 | port = drm_dp_get_validated_port_ref(mgr, port); |
| 2582 | if (!port) |
| 2583 | return; |
| 2584 | |
| 2585 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); |
| 2586 | port->vcpi.num_slots = 0; |
| 2587 | port->vcpi.pbn = 0; |
| 2588 | port->vcpi.aligned_pbn = 0; |
| 2589 | port->vcpi.vcpi = 0; |
| 2590 | drm_dp_put_port(port); |
| 2591 | } |
| 2592 | EXPORT_SYMBOL(drm_dp_mst_deallocate_vcpi); |
| 2593 | |
| 2594 | static int drm_dp_dpcd_write_payload(struct drm_dp_mst_topology_mgr *mgr, |
| 2595 | int id, struct drm_dp_payload *payload) |
| 2596 | { |
| 2597 | u8 payload_alloc[3], status; |
| 2598 | int ret; |
| 2599 | int retries = 0; |
| 2600 | |
| 2601 | drm_dp_dpcd_writeb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, |
| 2602 | DP_PAYLOAD_TABLE_UPDATED); |
| 2603 | |
| 2604 | payload_alloc[0] = id; |
| 2605 | payload_alloc[1] = payload->start_slot; |
| 2606 | payload_alloc[2] = payload->num_slots; |
| 2607 | |
| 2608 | ret = drm_dp_dpcd_write(mgr->aux, DP_PAYLOAD_ALLOCATE_SET, payload_alloc, 3); |
| 2609 | if (ret != 3) { |
| 2610 | DRM_DEBUG_KMS("failed to write payload allocation %d\n", ret); |
| 2611 | goto fail; |
| 2612 | } |
| 2613 | |
| 2614 | retry: |
| 2615 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); |
| 2616 | if (ret < 0) { |
| 2617 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); |
| 2618 | goto fail; |
| 2619 | } |
| 2620 | |
| 2621 | if (!(status & DP_PAYLOAD_TABLE_UPDATED)) { |
| 2622 | retries++; |
| 2623 | if (retries < 20) { |
| 2624 | usleep_range(10000, 20000); |
| 2625 | goto retry; |
| 2626 | } |
| 2627 | DRM_DEBUG_KMS("status not set after read payload table status %d\n", status); |
| 2628 | ret = -EINVAL; |
| 2629 | goto fail; |
| 2630 | } |
| 2631 | ret = 0; |
| 2632 | fail: |
| 2633 | return ret; |
| 2634 | } |
| 2635 | |
| 2636 | |
| 2637 | /** |
| 2638 | * drm_dp_check_act_status() - Check ACT handled status. |
| 2639 | * @mgr: manager to use |
| 2640 | * |
| 2641 | * Check the payload status bits in the DPCD for ACT handled completion. |
| 2642 | */ |
| 2643 | int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr) |
| 2644 | { |
| 2645 | u8 status; |
| 2646 | int ret; |
| 2647 | int count = 0; |
| 2648 | |
| 2649 | do { |
| 2650 | ret = drm_dp_dpcd_readb(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS, &status); |
| 2651 | |
| 2652 | if (ret < 0) { |
| 2653 | DRM_DEBUG_KMS("failed to read payload table status %d\n", ret); |
| 2654 | goto fail; |
| 2655 | } |
| 2656 | |
| 2657 | if (status & DP_PAYLOAD_ACT_HANDLED) |
| 2658 | break; |
| 2659 | count++; |
| 2660 | udelay(100); |
| 2661 | |
| 2662 | } while (count < 30); |
| 2663 | |
| 2664 | if (!(status & DP_PAYLOAD_ACT_HANDLED)) { |
| 2665 | DRM_DEBUG_KMS("failed to get ACT bit %d after %d retries\n", status, count); |
| 2666 | ret = -EINVAL; |
| 2667 | goto fail; |
| 2668 | } |
| 2669 | return 0; |
| 2670 | fail: |
| 2671 | return ret; |
| 2672 | } |
| 2673 | EXPORT_SYMBOL(drm_dp_check_act_status); |
| 2674 | |
| 2675 | /** |
| 2676 | * drm_dp_calc_pbn_mode() - Calculate the PBN for a mode. |
| 2677 | * @clock: dot clock for the mode |
| 2678 | * @bpp: bpp for the mode. |
| 2679 | * |
| 2680 | * This uses the formula in the spec to calculate the PBN value for a mode. |
| 2681 | */ |
| 2682 | int drm_dp_calc_pbn_mode(int clock, int bpp) |
| 2683 | { |
Harry Wentland | a9ebb3e | 2016-01-22 17:07:26 -0500 | [diff] [blame] | 2684 | u64 kbps; |
| 2685 | s64 peak_kbps; |
| 2686 | u32 numerator; |
| 2687 | u32 denominator; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2688 | |
Harry Wentland | a9ebb3e | 2016-01-22 17:07:26 -0500 | [diff] [blame] | 2689 | kbps = clock * bpp; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2690 | |
Harry Wentland | a9ebb3e | 2016-01-22 17:07:26 -0500 | [diff] [blame] | 2691 | /* |
| 2692 | * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006 |
| 2693 | * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on |
| 2694 | * common multiplier to render an integer PBN for all link rate/lane |
| 2695 | * counts combinations |
| 2696 | * calculate |
| 2697 | * peak_kbps *= (1006/1000) |
| 2698 | * peak_kbps *= (64/54) |
| 2699 | * peak_kbps *= 8 convert to bytes |
| 2700 | */ |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2701 | |
Harry Wentland | a9ebb3e | 2016-01-22 17:07:26 -0500 | [diff] [blame] | 2702 | numerator = 64 * 1006; |
| 2703 | denominator = 54 * 8 * 1000 * 1000; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2704 | |
Harry Wentland | a9ebb3e | 2016-01-22 17:07:26 -0500 | [diff] [blame] | 2705 | kbps *= numerator; |
| 2706 | peak_kbps = drm_fixp_from_fraction(kbps, denominator); |
| 2707 | |
| 2708 | return drm_fixp2int_ceil(peak_kbps); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2709 | } |
| 2710 | EXPORT_SYMBOL(drm_dp_calc_pbn_mode); |
| 2711 | |
| 2712 | static int test_calc_pbn_mode(void) |
| 2713 | { |
| 2714 | int ret; |
| 2715 | ret = drm_dp_calc_pbn_mode(154000, 30); |
Harry Wentland | a9ebb3e | 2016-01-22 17:07:26 -0500 | [diff] [blame] | 2716 | if (ret != 689) { |
| 2717 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", |
| 2718 | 154000, 30, 689, ret); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2719 | return -EINVAL; |
Harry Wentland | a9ebb3e | 2016-01-22 17:07:26 -0500 | [diff] [blame] | 2720 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2721 | ret = drm_dp_calc_pbn_mode(234000, 30); |
Harry Wentland | a9ebb3e | 2016-01-22 17:07:26 -0500 | [diff] [blame] | 2722 | if (ret != 1047) { |
| 2723 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", |
| 2724 | 234000, 30, 1047, ret); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2725 | return -EINVAL; |
Harry Wentland | a9ebb3e | 2016-01-22 17:07:26 -0500 | [diff] [blame] | 2726 | } |
| 2727 | ret = drm_dp_calc_pbn_mode(297000, 24); |
| 2728 | if (ret != 1063) { |
| 2729 | DRM_ERROR("PBN calculation test failed - clock %d, bpp %d, expected PBN %d, actual PBN %d.\n", |
| 2730 | 297000, 24, 1063, ret); |
| 2731 | return -EINVAL; |
| 2732 | } |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2733 | return 0; |
| 2734 | } |
| 2735 | |
| 2736 | /* we want to kick the TX after we've ack the up/down IRQs. */ |
| 2737 | static void drm_dp_mst_kick_tx(struct drm_dp_mst_topology_mgr *mgr) |
| 2738 | { |
| 2739 | queue_work(system_long_wq, &mgr->tx_work); |
| 2740 | } |
| 2741 | |
| 2742 | static void drm_dp_mst_dump_mstb(struct seq_file *m, |
| 2743 | struct drm_dp_mst_branch *mstb) |
| 2744 | { |
| 2745 | struct drm_dp_mst_port *port; |
| 2746 | int tabs = mstb->lct; |
| 2747 | char prefix[10]; |
| 2748 | int i; |
| 2749 | |
| 2750 | for (i = 0; i < tabs; i++) |
| 2751 | prefix[i] = '\t'; |
| 2752 | prefix[i] = '\0'; |
| 2753 | |
| 2754 | seq_printf(m, "%smst: %p, %d\n", prefix, mstb, mstb->num_ports); |
| 2755 | list_for_each_entry(port, &mstb->ports, next) { |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 2756 | seq_printf(m, "%sport: %d: input: %d: pdt: %d, ddps: %d ldps: %d, sdp: %d/%d, %p, conn: %p\n", prefix, port->port_num, port->input, port->pdt, port->ddps, port->ldps, port->num_sdp_streams, port->num_sdp_stream_sinks, port, port->connector); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2757 | if (port->mstb) |
| 2758 | drm_dp_mst_dump_mstb(m, port->mstb); |
| 2759 | } |
| 2760 | } |
| 2761 | |
| 2762 | static bool dump_dp_payload_table(struct drm_dp_mst_topology_mgr *mgr, |
| 2763 | char *buf) |
| 2764 | { |
| 2765 | int ret; |
| 2766 | int i; |
| 2767 | for (i = 0; i < 4; i++) { |
| 2768 | ret = drm_dp_dpcd_read(mgr->aux, DP_PAYLOAD_TABLE_UPDATE_STATUS + (i * 16), &buf[i * 16], 16); |
| 2769 | if (ret != 16) |
| 2770 | break; |
| 2771 | } |
| 2772 | if (i == 4) |
| 2773 | return true; |
| 2774 | return false; |
| 2775 | } |
| 2776 | |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 2777 | static void fetch_monitor_name(struct drm_dp_mst_topology_mgr *mgr, |
| 2778 | struct drm_dp_mst_port *port, char *name, |
| 2779 | int namelen) |
| 2780 | { |
| 2781 | struct edid *mst_edid; |
| 2782 | |
| 2783 | mst_edid = drm_dp_mst_get_edid(port->connector, mgr, port); |
| 2784 | drm_edid_get_monitor_name(mst_edid, name, namelen); |
| 2785 | } |
| 2786 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2787 | /** |
| 2788 | * drm_dp_mst_dump_topology(): dump topology to seq file. |
| 2789 | * @m: seq_file to dump output to |
| 2790 | * @mgr: manager to dump current topology for. |
| 2791 | * |
| 2792 | * helper to dump MST topology to a seq file for debugfs. |
| 2793 | */ |
| 2794 | void drm_dp_mst_dump_topology(struct seq_file *m, |
| 2795 | struct drm_dp_mst_topology_mgr *mgr) |
| 2796 | { |
| 2797 | int i; |
| 2798 | struct drm_dp_mst_port *port; |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 2799 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2800 | mutex_lock(&mgr->lock); |
| 2801 | if (mgr->mst_primary) |
| 2802 | drm_dp_mst_dump_mstb(m, mgr->mst_primary); |
| 2803 | |
| 2804 | /* dump VCPIs */ |
| 2805 | mutex_unlock(&mgr->lock); |
| 2806 | |
| 2807 | mutex_lock(&mgr->payload_lock); |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 2808 | seq_printf(m, "vcpi: %lx %lx %d\n", mgr->payload_mask, mgr->vcpi_mask, |
| 2809 | mgr->max_payloads); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2810 | |
| 2811 | for (i = 0; i < mgr->max_payloads; i++) { |
| 2812 | if (mgr->proposed_vcpis[i]) { |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 2813 | char name[14]; |
| 2814 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2815 | port = container_of(mgr->proposed_vcpis[i], struct drm_dp_mst_port, vcpi); |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 2816 | fetch_monitor_name(mgr, port, name, sizeof(name)); |
| 2817 | seq_printf(m, "vcpi %d: %d %d %d sink name: %s\n", i, |
| 2818 | port->port_num, port->vcpi.vcpi, |
| 2819 | port->vcpi.num_slots, |
| 2820 | (*name != 0) ? name : "Unknown"); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2821 | } else |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 2822 | seq_printf(m, "vcpi %d:unused\n", i); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2823 | } |
| 2824 | for (i = 0; i < mgr->max_payloads; i++) { |
| 2825 | seq_printf(m, "payload %d: %d, %d, %d\n", |
| 2826 | i, |
| 2827 | mgr->payloads[i].payload_state, |
| 2828 | mgr->payloads[i].start_slot, |
| 2829 | mgr->payloads[i].num_slots); |
| 2830 | |
| 2831 | |
| 2832 | } |
| 2833 | mutex_unlock(&mgr->payload_lock); |
| 2834 | |
| 2835 | mutex_lock(&mgr->lock); |
| 2836 | if (mgr->mst_primary) { |
| 2837 | u8 buf[64]; |
| 2838 | bool bret; |
| 2839 | int ret; |
| 2840 | ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); |
| 2841 | seq_printf(m, "dpcd: "); |
| 2842 | for (i = 0; i < DP_RECEIVER_CAP_SIZE; i++) |
| 2843 | seq_printf(m, "%02x ", buf[i]); |
| 2844 | seq_printf(m, "\n"); |
| 2845 | ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); |
| 2846 | seq_printf(m, "faux/mst: "); |
| 2847 | for (i = 0; i < 2; i++) |
| 2848 | seq_printf(m, "%02x ", buf[i]); |
| 2849 | seq_printf(m, "\n"); |
| 2850 | ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); |
| 2851 | seq_printf(m, "mst ctrl: "); |
| 2852 | for (i = 0; i < 1; i++) |
| 2853 | seq_printf(m, "%02x ", buf[i]); |
| 2854 | seq_printf(m, "\n"); |
| 2855 | |
Dave Airlie | 4479046 | 2015-07-14 11:33:31 +1000 | [diff] [blame] | 2856 | /* dump the standard OUI branch header */ |
| 2857 | ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); |
| 2858 | seq_printf(m, "branch oui: "); |
| 2859 | for (i = 0; i < 0x3; i++) |
| 2860 | seq_printf(m, "%02x", buf[i]); |
| 2861 | seq_printf(m, " devid: "); |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 2862 | for (i = 0x3; i < 0x8 && buf[i]; i++) |
Dave Airlie | 4479046 | 2015-07-14 11:33:31 +1000 | [diff] [blame] | 2863 | seq_printf(m, "%c", buf[i]); |
Jim Bride | 51108f2 | 2016-04-14 10:18:36 -0700 | [diff] [blame] | 2864 | |
Dave Airlie | 4479046 | 2015-07-14 11:33:31 +1000 | [diff] [blame] | 2865 | seq_printf(m, " revision: hw: %x.%x sw: %x.%x", buf[0x9] >> 4, buf[0x9] & 0xf, buf[0xa], buf[0xb]); |
| 2866 | seq_printf(m, "\n"); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2867 | bret = dump_dp_payload_table(mgr, buf); |
| 2868 | if (bret == true) { |
| 2869 | seq_printf(m, "payload table: "); |
| 2870 | for (i = 0; i < 63; i++) |
| 2871 | seq_printf(m, "%02x ", buf[i]); |
| 2872 | seq_printf(m, "\n"); |
| 2873 | } |
| 2874 | |
| 2875 | } |
| 2876 | |
| 2877 | mutex_unlock(&mgr->lock); |
| 2878 | |
| 2879 | } |
| 2880 | EXPORT_SYMBOL(drm_dp_mst_dump_topology); |
| 2881 | |
| 2882 | static void drm_dp_tx_work(struct work_struct *work) |
| 2883 | { |
| 2884 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, tx_work); |
| 2885 | |
| 2886 | mutex_lock(&mgr->qlock); |
Daniel Vetter | cb021a3 | 2016-07-15 21:48:03 +0200 | [diff] [blame] | 2887 | if (!list_empty(&mgr->tx_msg_downq)) |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2888 | process_single_down_tx_qlock(mgr); |
| 2889 | mutex_unlock(&mgr->qlock); |
| 2890 | } |
| 2891 | |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 2892 | static void drm_dp_free_mst_port(struct kref *kref) |
| 2893 | { |
| 2894 | struct drm_dp_mst_port *port = container_of(kref, struct drm_dp_mst_port, kref); |
| 2895 | kref_put(&port->parent->kref, drm_dp_free_mst_branch_device); |
| 2896 | kfree(port); |
| 2897 | } |
| 2898 | |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 2899 | static void drm_dp_destroy_connector_work(struct work_struct *work) |
| 2900 | { |
| 2901 | struct drm_dp_mst_topology_mgr *mgr = container_of(work, struct drm_dp_mst_topology_mgr, destroy_connector_work); |
Maarten Lankhorst | 4772ff0 | 2015-08-11 09:54:29 +0200 | [diff] [blame] | 2902 | struct drm_dp_mst_port *port; |
Dave Airlie | df4839f | 2015-09-16 10:37:28 +1000 | [diff] [blame] | 2903 | bool send_hotplug = false; |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 2904 | /* |
| 2905 | * Not a regular list traverse as we have to drop the destroy |
| 2906 | * connector lock before destroying the connector, to avoid AB->BA |
| 2907 | * ordering between this lock and the config mutex. |
| 2908 | */ |
| 2909 | for (;;) { |
| 2910 | mutex_lock(&mgr->destroy_connector_lock); |
Maarten Lankhorst | 4772ff0 | 2015-08-11 09:54:29 +0200 | [diff] [blame] | 2911 | port = list_first_entry_or_null(&mgr->destroy_connector_list, struct drm_dp_mst_port, next); |
| 2912 | if (!port) { |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 2913 | mutex_unlock(&mgr->destroy_connector_lock); |
| 2914 | break; |
| 2915 | } |
Maarten Lankhorst | 4772ff0 | 2015-08-11 09:54:29 +0200 | [diff] [blame] | 2916 | list_del(&port->next); |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 2917 | mutex_unlock(&mgr->destroy_connector_lock); |
| 2918 | |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 2919 | kref_init(&port->kref); |
| 2920 | INIT_LIST_HEAD(&port->next); |
| 2921 | |
Maarten Lankhorst | 4772ff0 | 2015-08-11 09:54:29 +0200 | [diff] [blame] | 2922 | mgr->cbs->destroy_connector(mgr, port->connector); |
| 2923 | |
| 2924 | drm_dp_port_teardown_pdt(port, port->pdt); |
Ville Syrjälä | 36e3fa6 | 2016-10-26 16:30:33 +0300 | [diff] [blame] | 2925 | port->pdt = DP_PEER_DEVICE_NONE; |
Maarten Lankhorst | 4772ff0 | 2015-08-11 09:54:29 +0200 | [diff] [blame] | 2926 | |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 2927 | if (!port->input && port->vcpi.vcpi > 0) { |
Andrey Grodzovsky | fd2d2ba | 2016-05-25 16:45:43 -0400 | [diff] [blame] | 2928 | drm_dp_mst_reset_vcpi_slots(mgr, port); |
| 2929 | drm_dp_update_payload_part1(mgr); |
| 2930 | drm_dp_mst_put_payload_id(mgr, port->vcpi.vcpi); |
Mykola Lysenko | 91a25e4 | 2016-01-27 09:39:36 -0500 | [diff] [blame] | 2931 | } |
| 2932 | |
| 2933 | kref_put(&port->kref, drm_dp_free_mst_port); |
Dave Airlie | df4839f | 2015-09-16 10:37:28 +1000 | [diff] [blame] | 2934 | send_hotplug = true; |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 2935 | } |
Dave Airlie | df4839f | 2015-09-16 10:37:28 +1000 | [diff] [blame] | 2936 | if (send_hotplug) |
| 2937 | (*mgr->cbs->hotplug)(mgr); |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 2938 | } |
| 2939 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2940 | /** |
| 2941 | * drm_dp_mst_topology_mgr_init - initialise a topology manager |
| 2942 | * @mgr: manager struct to initialise |
| 2943 | * @dev: device providing this structure - for i2c addition. |
| 2944 | * @aux: DP helper aux channel to talk to this device |
| 2945 | * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit |
| 2946 | * @max_payloads: maximum number of payloads this GPU can source |
| 2947 | * @conn_base_id: the connector object ID the MST device is connected to. |
| 2948 | * |
| 2949 | * Return 0 for success, or negative error code on failure |
| 2950 | */ |
| 2951 | int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, |
| 2952 | struct device *dev, struct drm_dp_aux *aux, |
| 2953 | int max_dpcd_transaction_bytes, |
| 2954 | int max_payloads, int conn_base_id) |
| 2955 | { |
| 2956 | mutex_init(&mgr->lock); |
| 2957 | mutex_init(&mgr->qlock); |
| 2958 | mutex_init(&mgr->payload_lock); |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 2959 | mutex_init(&mgr->destroy_connector_lock); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2960 | INIT_LIST_HEAD(&mgr->tx_msg_downq); |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 2961 | INIT_LIST_HEAD(&mgr->destroy_connector_list); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2962 | INIT_WORK(&mgr->work, drm_dp_mst_link_probe_work); |
| 2963 | INIT_WORK(&mgr->tx_work, drm_dp_tx_work); |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 2964 | INIT_WORK(&mgr->destroy_connector_work, drm_dp_destroy_connector_work); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2965 | init_waitqueue_head(&mgr->tx_waitq); |
| 2966 | mgr->dev = dev; |
| 2967 | mgr->aux = aux; |
| 2968 | mgr->max_dpcd_transaction_bytes = max_dpcd_transaction_bytes; |
| 2969 | mgr->max_payloads = max_payloads; |
| 2970 | mgr->conn_base_id = conn_base_id; |
Imre Deak | 4d6a10d | 2016-01-29 14:44:29 +0200 | [diff] [blame] | 2971 | if (max_payloads + 1 > sizeof(mgr->payload_mask) * 8 || |
| 2972 | max_payloads + 1 > sizeof(mgr->vcpi_mask) * 8) |
| 2973 | return -EINVAL; |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2974 | mgr->payloads = kcalloc(max_payloads, sizeof(struct drm_dp_payload), GFP_KERNEL); |
| 2975 | if (!mgr->payloads) |
| 2976 | return -ENOMEM; |
| 2977 | mgr->proposed_vcpis = kcalloc(max_payloads, sizeof(struct drm_dp_vcpi *), GFP_KERNEL); |
| 2978 | if (!mgr->proposed_vcpis) |
| 2979 | return -ENOMEM; |
| 2980 | set_bit(0, &mgr->payload_mask); |
Imre Deak | 441388a | 2016-01-29 14:44:28 +0200 | [diff] [blame] | 2981 | if (test_calc_pbn_mode() < 0) |
| 2982 | DRM_ERROR("MST PBN self-test failed\n"); |
| 2983 | |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2984 | return 0; |
| 2985 | } |
| 2986 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_init); |
| 2987 | |
| 2988 | /** |
| 2989 | * drm_dp_mst_topology_mgr_destroy() - destroy topology manager. |
| 2990 | * @mgr: manager to destroy |
| 2991 | */ |
| 2992 | void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr) |
| 2993 | { |
Dave Airlie | 274d835 | 2015-09-30 10:39:42 +1000 | [diff] [blame] | 2994 | flush_work(&mgr->work); |
Dave Airlie | 6b8eeca | 2015-06-15 10:34:28 +1000 | [diff] [blame] | 2995 | flush_work(&mgr->destroy_connector_work); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 2996 | mutex_lock(&mgr->payload_lock); |
| 2997 | kfree(mgr->payloads); |
| 2998 | mgr->payloads = NULL; |
| 2999 | kfree(mgr->proposed_vcpis); |
| 3000 | mgr->proposed_vcpis = NULL; |
| 3001 | mutex_unlock(&mgr->payload_lock); |
| 3002 | mgr->dev = NULL; |
| 3003 | mgr->aux = NULL; |
| 3004 | } |
| 3005 | EXPORT_SYMBOL(drm_dp_mst_topology_mgr_destroy); |
| 3006 | |
| 3007 | /* I2C device */ |
| 3008 | static int drm_dp_mst_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, |
| 3009 | int num) |
| 3010 | { |
| 3011 | struct drm_dp_aux *aux = adapter->algo_data; |
| 3012 | struct drm_dp_mst_port *port = container_of(aux, struct drm_dp_mst_port, aux); |
| 3013 | struct drm_dp_mst_branch *mstb; |
| 3014 | struct drm_dp_mst_topology_mgr *mgr = port->mgr; |
| 3015 | unsigned int i; |
| 3016 | bool reading = false; |
| 3017 | struct drm_dp_sideband_msg_req_body msg; |
| 3018 | struct drm_dp_sideband_msg_tx *txmsg = NULL; |
| 3019 | int ret; |
| 3020 | |
| 3021 | mstb = drm_dp_get_validated_mstb_ref(mgr, port->parent); |
| 3022 | if (!mstb) |
| 3023 | return -EREMOTEIO; |
| 3024 | |
| 3025 | /* construct i2c msg */ |
| 3026 | /* see if last msg is a read */ |
| 3027 | if (msgs[num - 1].flags & I2C_M_RD) |
| 3028 | reading = true; |
| 3029 | |
Dave Airlie | ae49154 | 2015-10-14 18:51:17 +1000 | [diff] [blame] | 3030 | if (!reading || (num - 1 > DP_REMOTE_I2C_READ_MAX_TRANSACTIONS)) { |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3031 | DRM_DEBUG_KMS("Unsupported I2C transaction for MST device\n"); |
| 3032 | ret = -EIO; |
| 3033 | goto out; |
| 3034 | } |
| 3035 | |
Dave Airlie | ae49154 | 2015-10-14 18:51:17 +1000 | [diff] [blame] | 3036 | memset(&msg, 0, sizeof(msg)); |
Dave Airlie | ad7f8a1 | 2014-06-05 14:01:32 +1000 | [diff] [blame] | 3037 | msg.req_type = DP_REMOTE_I2C_READ; |
| 3038 | msg.u.i2c_read.num_transactions = num - 1; |
| 3039 | msg.u.i2c_read.port_number = port->port_num; |
| 3040 | for (i = 0; i < num - 1; i++) { |
| 3041 | msg.u.i2c_read.transactions[i].i2c_dev_id = msgs[i].addr; |
| 3042 | msg.u.i2c_read.transactions[i].num_bytes = msgs[i].len; |
| 3043 | msg.u.i2c_read.transactions[i].bytes = msgs[i].buf; |
| 3044 | } |
| 3045 | msg.u.i2c_read.read_i2c_device_id = msgs[num - 1].addr; |
| 3046 | msg.u.i2c_read.num_bytes_read = msgs[num - 1].len; |
| 3047 | |
| 3048 | txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); |
| 3049 | if (!txmsg) { |
| 3050 | ret = -ENOMEM; |
| 3051 | goto out; |
| 3052 | } |
| 3053 | |
| 3054 | txmsg->dst = mstb; |
| 3055 | drm_dp_encode_sideband_req(&msg, txmsg); |
| 3056 | |
| 3057 | drm_dp_queue_down_tx(mgr, txmsg); |
| 3058 | |
| 3059 | ret = drm_dp_mst_wait_tx_reply(mstb, txmsg); |
| 3060 | if (ret > 0) { |
| 3061 | |
| 3062 | if (txmsg->reply.reply_type == 1) { /* got a NAK back */ |
| 3063 | ret = -EREMOTEIO; |
| 3064 | goto out; |
| 3065 | } |
| 3066 | if (txmsg->reply.u.remote_i2c_read_ack.num_bytes != msgs[num - 1].len) { |
| 3067 | ret = -EIO; |
| 3068 | goto out; |
| 3069 | } |
| 3070 | memcpy(msgs[num - 1].buf, txmsg->reply.u.remote_i2c_read_ack.bytes, msgs[num - 1].len); |
| 3071 | ret = num; |
| 3072 | } |
| 3073 | out: |
| 3074 | kfree(txmsg); |
| 3075 | drm_dp_put_mst_branch_device(mstb); |
| 3076 | return ret; |
| 3077 | } |
| 3078 | |
| 3079 | static u32 drm_dp_mst_i2c_functionality(struct i2c_adapter *adapter) |
| 3080 | { |
| 3081 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | |
| 3082 | I2C_FUNC_SMBUS_READ_BLOCK_DATA | |
| 3083 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL | |
| 3084 | I2C_FUNC_10BIT_ADDR; |
| 3085 | } |
| 3086 | |
| 3087 | static const struct i2c_algorithm drm_dp_mst_i2c_algo = { |
| 3088 | .functionality = drm_dp_mst_i2c_functionality, |
| 3089 | .master_xfer = drm_dp_mst_i2c_xfer, |
| 3090 | }; |
| 3091 | |
| 3092 | /** |
| 3093 | * drm_dp_mst_register_i2c_bus() - register an I2C adapter for I2C-over-AUX |
| 3094 | * @aux: DisplayPort AUX channel |
| 3095 | * |
| 3096 | * Returns 0 on success or a negative error code on failure. |
| 3097 | */ |
| 3098 | static int drm_dp_mst_register_i2c_bus(struct drm_dp_aux *aux) |
| 3099 | { |
| 3100 | aux->ddc.algo = &drm_dp_mst_i2c_algo; |
| 3101 | aux->ddc.algo_data = aux; |
| 3102 | aux->ddc.retries = 3; |
| 3103 | |
| 3104 | aux->ddc.class = I2C_CLASS_DDC; |
| 3105 | aux->ddc.owner = THIS_MODULE; |
| 3106 | aux->ddc.dev.parent = aux->dev; |
| 3107 | aux->ddc.dev.of_node = aux->dev->of_node; |
| 3108 | |
| 3109 | strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), |
| 3110 | sizeof(aux->ddc.name)); |
| 3111 | |
| 3112 | return i2c_add_adapter(&aux->ddc); |
| 3113 | } |
| 3114 | |
| 3115 | /** |
| 3116 | * drm_dp_mst_unregister_i2c_bus() - unregister an I2C-over-AUX adapter |
| 3117 | * @aux: DisplayPort AUX channel |
| 3118 | */ |
| 3119 | static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_aux *aux) |
| 3120 | { |
| 3121 | i2c_del_adapter(&aux->ddc); |
| 3122 | } |