1 /* 2 * Copyright 2007-8 Advanced Micro Devices, Inc. 3 * Copyright 2008 Red Hat Inc. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be included in 13 * all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 21 * OTHER DEALINGS IN THE SOFTWARE. 22 * 23 * Authors: Dave Airlie 24 * Alex Deucher 25 * Jerome Glisse 26 */ 27 28 #include <drm/radeon_drm.h> 29 #include "radeon.h" 30 31 #include "atom.h" 32 #include "atom-bits.h" 33 #include <drm/drm_dp_helper.h> 34 35 /* move these to drm_dp_helper.c/h */ 36 #define DP_LINK_CONFIGURATION_SIZE 9 37 #define DP_DPCD_SIZE DP_RECEIVER_CAP_SIZE 38 39 static char *voltage_names[] = { 40 "0.4V", "0.6V", "0.8V", "1.2V" 41 }; 42 static char *pre_emph_names[] = { 43 "0dB", "3.5dB", "6dB", "9.5dB" 44 }; 45 46 /***** radeon AUX functions *****/ 47 48 /* Atom needs data in little endian format so swap as appropriate when copying 49 * data to or from atom. Note that atom operates on dw units. 50 * 51 * Use to_le=true when sending data to atom and provide at least 52 * ALIGN(num_bytes,4) bytes in the dst buffer. 53 * 54 * Use to_le=false when receiving data from atom and provide ALIGN(num_bytes,4) 55 * byes in the src buffer. 56 */ 57 void radeon_atom_copy_swap(u8 *dst, u8 *src, u8 num_bytes, bool to_le) 58 { 59 #ifdef __BIG_ENDIAN 60 u32 src_tmp[5], dst_tmp[5]; 61 int i; 62 u8 align_num_bytes = ALIGN(num_bytes, 4); 63 64 if (to_le) { 65 memcpy(src_tmp, src, num_bytes); 66 for (i = 0; i < align_num_bytes / 4; i++) 67 dst_tmp[i] = cpu_to_le32(src_tmp[i]); 68 memcpy(dst, dst_tmp, align_num_bytes); 69 } else { 70 memcpy(src_tmp, src, align_num_bytes); 71 for (i = 0; i < align_num_bytes / 4; i++) 72 dst_tmp[i] = le32_to_cpu(src_tmp[i]); 73 memcpy(dst, dst_tmp, num_bytes); 74 } 75 #else 76 memcpy(dst, src, num_bytes); 77 #endif 78 } 79 80 union aux_channel_transaction { 81 PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION v1; 82 PROCESS_AUX_CHANNEL_TRANSACTION_PARAMETERS_V2 v2; 83 }; 84 85 static int radeon_process_aux_ch(struct radeon_i2c_chan *chan, 86 u8 *send, int send_bytes, 87 u8 *recv, int recv_size, 88 u8 delay, u8 *ack) 89 { 90 struct drm_device *dev = chan->dev; 91 struct radeon_device *rdev = dev->dev_private; 92 union aux_channel_transaction args; 93 int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction); 94 unsigned char *base; 95 int recv_bytes; 96 int r = 0; 97 98 memset(&args, 0, sizeof(args)); 99 100 mutex_lock(&chan->mutex); 101 mutex_lock(&rdev->mode_info.atom_context->scratch_mutex); 102 103 base = (unsigned char *)(rdev->mode_info.atom_context->scratch + 1); 104 105 radeon_atom_copy_swap(base, send, send_bytes, true); 106 107 args.v1.lpAuxRequest = cpu_to_le16((u16)(0 + 4)); 108 args.v1.lpDataOut = cpu_to_le16((u16)(16 + 4)); 109 args.v1.ucDataOutLen = 0; 110 args.v1.ucChannelID = chan->rec.i2c_id; 111 args.v1.ucDelay = delay / 10; 112 if (ASIC_IS_DCE4(rdev)) 113 args.v2.ucHPD_ID = chan->rec.hpd; 114 115 atom_execute_table_scratch_unlocked(rdev->mode_info.atom_context, index, (uint32_t *)&args); 116 117 *ack = args.v1.ucReplyStatus; 118 119 /* timeout */ 120 if (args.v1.ucReplyStatus == 1) { 121 DRM_DEBUG_KMS("dp_aux_ch timeout\n"); 122 r = -ETIMEDOUT; 123 goto done; 124 } 125 126 /* flags not zero */ 127 if (args.v1.ucReplyStatus == 2) { 128 DRM_DEBUG_KMS("dp_aux_ch flags not zero\n"); 129 r = -EIO; 130 goto done; 131 } 132 133 /* error */ 134 if (args.v1.ucReplyStatus == 3) { 135 DRM_DEBUG_KMS("dp_aux_ch error\n"); 136 r = -EIO; 137 goto done; 138 } 139 140 recv_bytes = args.v1.ucDataOutLen; 141 if (recv_bytes > recv_size) 142 recv_bytes = recv_size; 143 144 if (recv && recv_size) 145 radeon_atom_copy_swap(recv, base + 16, recv_bytes, false); 146 147 r = recv_bytes; 148 done: 149 mutex_unlock(&rdev->mode_info.atom_context->scratch_mutex); 150 mutex_unlock(&chan->mutex); 151 152 return r; 153 } 154 155 #define BARE_ADDRESS_SIZE 3 156 #define HEADER_SIZE (BARE_ADDRESS_SIZE + 1) 157 158 static ssize_t 159 radeon_dp_aux_transfer_atom(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) 160 { 161 struct radeon_i2c_chan *chan = 162 container_of(aux, struct radeon_i2c_chan, aux); 163 int ret; 164 u8 tx_buf[20]; 165 size_t tx_size; 166 u8 ack, delay = 0; 167 168 if (WARN_ON(msg->size > 16)) 169 return -E2BIG; 170 171 tx_buf[0] = msg->address & 0xff; 172 tx_buf[1] = (msg->address >> 8) & 0xff; 173 tx_buf[2] = (msg->request << 4) | 174 ((msg->address >> 16) & 0xf); 175 tx_buf[3] = msg->size ? (msg->size - 1) : 0; 176 177 switch (msg->request & ~DP_AUX_I2C_MOT) { 178 case DP_AUX_NATIVE_WRITE: 179 case DP_AUX_I2C_WRITE: 180 case DP_AUX_I2C_WRITE_STATUS_UPDATE: 181 /* The atom implementation only supports writes with a max payload of 182 * 12 bytes since it uses 4 bits for the total count (header + payload) 183 * in the parameter space. The atom interface supports 16 byte 184 * payloads for reads. The hw itself supports up to 16 bytes of payload. 185 */ 186 if (WARN_ON_ONCE(msg->size > 12)) 187 return -E2BIG; 188 /* tx_size needs to be 4 even for bare address packets since the atom 189 * table needs the info in tx_buf[3]. 190 */ 191 tx_size = HEADER_SIZE + msg->size; 192 if (msg->size == 0) 193 tx_buf[3] |= BARE_ADDRESS_SIZE << 4; 194 else 195 tx_buf[3] |= tx_size << 4; 196 memcpy(tx_buf + HEADER_SIZE, msg->buffer, msg->size); 197 ret = radeon_process_aux_ch(chan, 198 tx_buf, tx_size, NULL, 0, delay, &ack); 199 if (ret >= 0) 200 /* Return payload size. */ 201 ret = msg->size; 202 break; 203 case DP_AUX_NATIVE_READ: 204 case DP_AUX_I2C_READ: 205 /* tx_size needs to be 4 even for bare address packets since the atom 206 * table needs the info in tx_buf[3]. 207 */ 208 tx_size = HEADER_SIZE; 209 if (msg->size == 0) 210 tx_buf[3] |= BARE_ADDRESS_SIZE << 4; 211 else 212 tx_buf[3] |= tx_size << 4; 213 ret = radeon_process_aux_ch(chan, 214 tx_buf, tx_size, msg->buffer, msg->size, delay, &ack); 215 break; 216 default: 217 ret = -EINVAL; 218 break; 219 } 220 221 if (ret >= 0) 222 msg->reply = ack >> 4; 223 224 return ret; 225 } 226 227 void radeon_dp_aux_init(struct radeon_connector *radeon_connector) 228 { 229 struct drm_device *dev = radeon_connector->base.dev; 230 struct radeon_device *rdev = dev->dev_private; 231 int ret; 232 233 radeon_connector->ddc_bus->rec.hpd = radeon_connector->hpd.hpd; 234 radeon_connector->ddc_bus->aux.dev = radeon_connector->base.kdev; 235 if (ASIC_IS_DCE5(rdev)) { 236 if (radeon_auxch) 237 radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_native; 238 else 239 radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom; 240 } else { 241 radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_atom; 242 } 243 244 ret = drm_dp_aux_register(&radeon_connector->ddc_bus->aux); 245 if (!ret) 246 radeon_connector->ddc_bus->has_aux = true; 247 248 WARN(ret, "drm_dp_aux_register() failed with error %d\n", ret); 249 } 250 251 /***** general DP utility functions *****/ 252 253 #define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_LEVEL_3 254 #define DP_PRE_EMPHASIS_MAX DP_TRAIN_PRE_EMPH_LEVEL_3 255 256 static void dp_get_adjust_train(const u8 link_status[DP_LINK_STATUS_SIZE], 257 int lane_count, 258 u8 train_set[4]) 259 { 260 u8 v = 0; 261 u8 p = 0; 262 int lane; 263 264 for (lane = 0; lane < lane_count; lane++) { 265 u8 this_v = drm_dp_get_adjust_request_voltage(link_status, lane); 266 u8 this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane); 267 268 DRM_DEBUG_KMS("requested signal parameters: lane %d voltage %s pre_emph %s\n", 269 lane, 270 voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT], 271 pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]); 272 273 if (this_v > v) 274 v = this_v; 275 if (this_p > p) 276 p = this_p; 277 } 278 279 if (v >= DP_VOLTAGE_MAX) 280 v |= DP_TRAIN_MAX_SWING_REACHED; 281 282 if (p >= DP_PRE_EMPHASIS_MAX) 283 p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; 284 285 DRM_DEBUG_KMS("using signal parameters: voltage %s pre_emph %s\n", 286 voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT], 287 pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT]); 288 289 for (lane = 0; lane < 4; lane++) 290 train_set[lane] = v | p; 291 } 292 293 /* convert bits per color to bits per pixel */ 294 /* get bpc from the EDID */ 295 static int convert_bpc_to_bpp(int bpc) 296 { 297 if (bpc == 0) 298 return 24; 299 else 300 return bpc * 3; 301 } 302 303 /***** radeon specific DP functions *****/ 304 305 static int radeon_dp_get_dp_link_config(struct drm_connector *connector, 306 const u8 dpcd[DP_DPCD_SIZE], 307 unsigned pix_clock, 308 unsigned *dp_lanes, unsigned *dp_rate) 309 { 310 int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector)); 311 static const unsigned link_rates[3] = { 162000, 270000, 540000 }; 312 unsigned max_link_rate = drm_dp_max_link_rate(dpcd); 313 unsigned max_lane_num = drm_dp_max_lane_count(dpcd); 314 unsigned lane_num, i, max_pix_clock; 315 316 if (radeon_connector_encoder_get_dp_bridge_encoder_id(connector) == 317 ENCODER_OBJECT_ID_NUTMEG) { 318 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) { 319 max_pix_clock = (lane_num * 270000 * 8) / bpp; 320 if (max_pix_clock >= pix_clock) { 321 *dp_lanes = lane_num; 322 *dp_rate = 270000; 323 return 0; 324 } 325 } 326 } else { 327 for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) { 328 for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) { 329 max_pix_clock = (lane_num * link_rates[i] * 8) / bpp; 330 if (max_pix_clock >= pix_clock) { 331 *dp_lanes = lane_num; 332 *dp_rate = link_rates[i]; 333 return 0; 334 } 335 } 336 } 337 } 338 339 return -EINVAL; 340 } 341 342 static u8 radeon_dp_encoder_service(struct radeon_device *rdev, 343 int action, int dp_clock, 344 u8 ucconfig, u8 lane_num) 345 { 346 DP_ENCODER_SERVICE_PARAMETERS args; 347 int index = GetIndexIntoMasterTable(COMMAND, DPEncoderService); 348 349 memset(&args, 0, sizeof(args)); 350 args.ucLinkClock = dp_clock / 10; 351 args.ucConfig = ucconfig; 352 args.ucAction = action; 353 args.ucLaneNum = lane_num; 354 args.ucStatus = 0; 355 356 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args); 357 return args.ucStatus; 358 } 359 360 u8 radeon_dp_getsinktype(struct radeon_connector *radeon_connector) 361 { 362 struct drm_device *dev = radeon_connector->base.dev; 363 struct radeon_device *rdev = dev->dev_private; 364 365 return radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_GET_SINK_TYPE, 0, 366 radeon_connector->ddc_bus->rec.i2c_id, 0); 367 } 368 369 static void radeon_dp_probe_oui(struct radeon_connector *radeon_connector) 370 { 371 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv; 372 u8 buf[3]; 373 374 if (!(dig_connector->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT)) 375 return; 376 377 if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_SINK_OUI, buf, 3) == 3) 378 DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n", 379 buf[0], buf[1], buf[2]); 380 381 if (drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_BRANCH_OUI, buf, 3) == 3) 382 DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n", 383 buf[0], buf[1], buf[2]); 384 } 385 386 bool radeon_dp_getdpcd(struct radeon_connector *radeon_connector) 387 { 388 struct radeon_connector_atom_dig *dig_connector = radeon_connector->con_priv; 389 u8 msg[DP_DPCD_SIZE]; 390 int ret; 391 392 ret = drm_dp_dpcd_read(&radeon_connector->ddc_bus->aux, DP_DPCD_REV, msg, 393 DP_DPCD_SIZE); 394 if (ret == DP_DPCD_SIZE) { 395 memcpy(dig_connector->dpcd, msg, DP_DPCD_SIZE); 396 397 DRM_DEBUG_KMS("DPCD: %*ph\n", (int)sizeof(dig_connector->dpcd), 398 dig_connector->dpcd); 399 400 radeon_dp_probe_oui(radeon_connector); 401 402 return true; 403 } 404 405 dig_connector->dpcd[0] = 0; 406 return false; 407 } 408 409 int radeon_dp_get_panel_mode(struct drm_encoder *encoder, 410 struct drm_connector *connector) 411 { 412 struct drm_device *dev = encoder->dev; 413 struct radeon_device *rdev = dev->dev_private; 414 struct radeon_connector *radeon_connector = to_radeon_connector(connector); 415 int panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE; 416 u16 dp_bridge = radeon_connector_encoder_get_dp_bridge_encoder_id(connector); 417 u8 tmp; 418 419 if (!ASIC_IS_DCE4(rdev)) 420 return panel_mode; 421 422 if (!radeon_connector->con_priv) 423 return panel_mode; 424 425 if (dp_bridge != ENCODER_OBJECT_ID_NONE) { 426 /* DP bridge chips */ 427 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux, 428 DP_EDP_CONFIGURATION_CAP, &tmp) == 1) { 429 if (tmp & 1) 430 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE; 431 else if ((dp_bridge == ENCODER_OBJECT_ID_NUTMEG) || 432 (dp_bridge == ENCODER_OBJECT_ID_TRAVIS)) 433 panel_mode = DP_PANEL_MODE_INTERNAL_DP1_MODE; 434 else 435 panel_mode = DP_PANEL_MODE_EXTERNAL_DP_MODE; 436 } 437 } else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) { 438 /* eDP */ 439 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux, 440 DP_EDP_CONFIGURATION_CAP, &tmp) == 1) { 441 if (tmp & 1) 442 panel_mode = DP_PANEL_MODE_INTERNAL_DP2_MODE; 443 } 444 } 445 446 return panel_mode; 447 } 448 449 void radeon_dp_set_link_config(struct drm_connector *connector, 450 const struct drm_display_mode *mode) 451 { 452 struct radeon_connector *radeon_connector = to_radeon_connector(connector); 453 struct radeon_connector_atom_dig *dig_connector; 454 int ret; 455 456 if (!radeon_connector->con_priv) 457 return; 458 dig_connector = radeon_connector->con_priv; 459 460 if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) || 461 (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) { 462 ret = radeon_dp_get_dp_link_config(connector, dig_connector->dpcd, 463 mode->clock, 464 &dig_connector->dp_lane_count, 465 &dig_connector->dp_clock); 466 if (ret) { 467 dig_connector->dp_clock = 0; 468 dig_connector->dp_lane_count = 0; 469 } 470 } 471 } 472 473 int radeon_dp_mode_valid_helper(struct drm_connector *connector, 474 struct drm_display_mode *mode) 475 { 476 struct radeon_connector *radeon_connector = to_radeon_connector(connector); 477 struct radeon_connector_atom_dig *dig_connector; 478 unsigned dp_clock, dp_lanes; 479 int ret; 480 481 if ((mode->clock > 340000) && 482 (!radeon_connector_is_dp12_capable(connector))) 483 return MODE_CLOCK_HIGH; 484 485 if (!radeon_connector->con_priv) 486 return MODE_CLOCK_HIGH; 487 dig_connector = radeon_connector->con_priv; 488 489 ret = radeon_dp_get_dp_link_config(connector, dig_connector->dpcd, 490 mode->clock, 491 &dp_lanes, 492 &dp_clock); 493 if (ret) 494 return MODE_CLOCK_HIGH; 495 496 if ((dp_clock == 540000) && 497 (!radeon_connector_is_dp12_capable(connector))) 498 return MODE_CLOCK_HIGH; 499 500 return MODE_OK; 501 } 502 503 bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector) 504 { 505 u8 link_status[DP_LINK_STATUS_SIZE]; 506 struct radeon_connector_atom_dig *dig = radeon_connector->con_priv; 507 508 if (drm_dp_dpcd_read_link_status(&radeon_connector->ddc_bus->aux, link_status) 509 <= 0) 510 return false; 511 if (drm_dp_channel_eq_ok(link_status, dig->dp_lane_count)) 512 return false; 513 return true; 514 } 515 516 void radeon_dp_set_rx_power_state(struct drm_connector *connector, 517 u8 power_state) 518 { 519 struct radeon_connector *radeon_connector = to_radeon_connector(connector); 520 struct radeon_connector_atom_dig *dig_connector; 521 522 if (!radeon_connector->con_priv) 523 return; 524 525 dig_connector = radeon_connector->con_priv; 526 527 /* power up/down the sink */ 528 if (dig_connector->dpcd[0] >= 0x11) { 529 drm_dp_dpcd_writeb(&radeon_connector->ddc_bus->aux, 530 DP_SET_POWER, power_state); 531 usleep_range(1000, 2000); 532 } 533 } 534 535 536 struct radeon_dp_link_train_info { 537 struct radeon_device *rdev; 538 struct drm_encoder *encoder; 539 struct drm_connector *connector; 540 int enc_id; 541 int dp_clock; 542 int dp_lane_count; 543 bool tp3_supported; 544 u8 dpcd[DP_RECEIVER_CAP_SIZE]; 545 u8 train_set[4]; 546 u8 link_status[DP_LINK_STATUS_SIZE]; 547 u8 tries; 548 bool use_dpencoder; 549 struct drm_dp_aux *aux; 550 }; 551 552 static void radeon_dp_update_vs_emph(struct radeon_dp_link_train_info *dp_info) 553 { 554 /* set the initial vs/emph on the source */ 555 atombios_dig_transmitter_setup(dp_info->encoder, 556 ATOM_TRANSMITTER_ACTION_SETUP_VSEMPH, 557 0, dp_info->train_set[0]); /* sets all lanes at once */ 558 559 /* set the vs/emph on the sink */ 560 drm_dp_dpcd_write(dp_info->aux, DP_TRAINING_LANE0_SET, 561 dp_info->train_set, dp_info->dp_lane_count); 562 } 563 564 static void radeon_dp_set_tp(struct radeon_dp_link_train_info *dp_info, int tp) 565 { 566 int rtp = 0; 567 568 /* set training pattern on the source */ 569 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) { 570 switch (tp) { 571 case DP_TRAINING_PATTERN_1: 572 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN1; 573 break; 574 case DP_TRAINING_PATTERN_2: 575 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2; 576 break; 577 case DP_TRAINING_PATTERN_3: 578 rtp = ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN3; 579 break; 580 } 581 atombios_dig_encoder_setup(dp_info->encoder, rtp, 0); 582 } else { 583 switch (tp) { 584 case DP_TRAINING_PATTERN_1: 585 rtp = 0; 586 break; 587 case DP_TRAINING_PATTERN_2: 588 rtp = 1; 589 break; 590 } 591 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL, 592 dp_info->dp_clock, dp_info->enc_id, rtp); 593 } 594 595 /* enable training pattern on the sink */ 596 drm_dp_dpcd_writeb(dp_info->aux, DP_TRAINING_PATTERN_SET, tp); 597 } 598 599 static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info) 600 { 601 struct radeon_encoder *radeon_encoder = to_radeon_encoder(dp_info->encoder); 602 struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv; 603 u8 tmp; 604 605 /* power up the sink */ 606 radeon_dp_set_rx_power_state(dp_info->connector, DP_SET_POWER_D0); 607 608 /* possibly enable downspread on the sink */ 609 if (dp_info->dpcd[3] & 0x1) 610 drm_dp_dpcd_writeb(dp_info->aux, 611 DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5); 612 else 613 drm_dp_dpcd_writeb(dp_info->aux, 614 DP_DOWNSPREAD_CTRL, 0); 615 616 if (dig->panel_mode == DP_PANEL_MODE_INTERNAL_DP2_MODE) 617 drm_dp_dpcd_writeb(dp_info->aux, DP_EDP_CONFIGURATION_SET, 1); 618 619 /* set the lane count on the sink */ 620 tmp = dp_info->dp_lane_count; 621 if (drm_dp_enhanced_frame_cap(dp_info->dpcd)) 622 tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN; 623 drm_dp_dpcd_writeb(dp_info->aux, DP_LANE_COUNT_SET, tmp); 624 625 /* set the link rate on the sink */ 626 tmp = drm_dp_link_rate_to_bw_code(dp_info->dp_clock); 627 drm_dp_dpcd_writeb(dp_info->aux, DP_LINK_BW_SET, tmp); 628 629 /* start training on the source */ 630 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) 631 atombios_dig_encoder_setup(dp_info->encoder, 632 ATOM_ENCODER_CMD_DP_LINK_TRAINING_START, 0); 633 else 634 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_START, 635 dp_info->dp_clock, dp_info->enc_id, 0); 636 637 /* disable the training pattern on the sink */ 638 drm_dp_dpcd_writeb(dp_info->aux, 639 DP_TRAINING_PATTERN_SET, 640 DP_TRAINING_PATTERN_DISABLE); 641 642 return 0; 643 } 644 645 static int radeon_dp_link_train_finish(struct radeon_dp_link_train_info *dp_info) 646 { 647 udelay(400); 648 649 /* disable the training pattern on the sink */ 650 drm_dp_dpcd_writeb(dp_info->aux, 651 DP_TRAINING_PATTERN_SET, 652 DP_TRAINING_PATTERN_DISABLE); 653 654 /* disable the training pattern on the source */ 655 if (ASIC_IS_DCE4(dp_info->rdev) || !dp_info->use_dpencoder) 656 atombios_dig_encoder_setup(dp_info->encoder, 657 ATOM_ENCODER_CMD_DP_LINK_TRAINING_COMPLETE, 0); 658 else 659 radeon_dp_encoder_service(dp_info->rdev, ATOM_DP_ACTION_TRAINING_COMPLETE, 660 dp_info->dp_clock, dp_info->enc_id, 0); 661 662 return 0; 663 } 664 665 static int radeon_dp_link_train_cr(struct radeon_dp_link_train_info *dp_info) 666 { 667 bool clock_recovery; 668 u8 voltage; 669 int i; 670 671 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_1); 672 memset(dp_info->train_set, 0, 4); 673 radeon_dp_update_vs_emph(dp_info); 674 675 udelay(400); 676 677 /* clock recovery loop */ 678 clock_recovery = false; 679 dp_info->tries = 0; 680 voltage = 0xff; 681 while (1) { 682 drm_dp_link_train_clock_recovery_delay(dp_info->dpcd); 683 684 if (drm_dp_dpcd_read_link_status(dp_info->aux, 685 dp_info->link_status) <= 0) { 686 DRM_ERROR("displayport link status failed\n"); 687 break; 688 } 689 690 if (drm_dp_clock_recovery_ok(dp_info->link_status, dp_info->dp_lane_count)) { 691 clock_recovery = true; 692 break; 693 } 694 695 for (i = 0; i < dp_info->dp_lane_count; i++) { 696 if ((dp_info->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0) 697 break; 698 } 699 if (i == dp_info->dp_lane_count) { 700 DRM_ERROR("clock recovery reached max voltage\n"); 701 break; 702 } 703 704 if ((dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) { 705 ++dp_info->tries; 706 if (dp_info->tries == 5) { 707 DRM_ERROR("clock recovery tried 5 times\n"); 708 break; 709 } 710 } else 711 dp_info->tries = 0; 712 713 voltage = dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; 714 715 /* Compute new train_set as requested by sink */ 716 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set); 717 718 radeon_dp_update_vs_emph(dp_info); 719 } 720 if (!clock_recovery) { 721 DRM_ERROR("clock recovery failed\n"); 722 return -1; 723 } else { 724 DRM_DEBUG_KMS("clock recovery at voltage %d pre-emphasis %d\n", 725 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK, 726 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >> 727 DP_TRAIN_PRE_EMPHASIS_SHIFT); 728 return 0; 729 } 730 } 731 732 static int radeon_dp_link_train_ce(struct radeon_dp_link_train_info *dp_info) 733 { 734 bool channel_eq; 735 736 if (dp_info->tp3_supported) 737 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_3); 738 else 739 radeon_dp_set_tp(dp_info, DP_TRAINING_PATTERN_2); 740 741 /* channel equalization loop */ 742 dp_info->tries = 0; 743 channel_eq = false; 744 while (1) { 745 drm_dp_link_train_channel_eq_delay(dp_info->dpcd); 746 747 if (drm_dp_dpcd_read_link_status(dp_info->aux, 748 dp_info->link_status) <= 0) { 749 DRM_ERROR("displayport link status failed\n"); 750 break; 751 } 752 753 if (drm_dp_channel_eq_ok(dp_info->link_status, dp_info->dp_lane_count)) { 754 channel_eq = true; 755 break; 756 } 757 758 /* Try 5 times */ 759 if (dp_info->tries > 5) { 760 DRM_ERROR("channel eq failed: 5 tries\n"); 761 break; 762 } 763 764 /* Compute new train_set as requested by sink */ 765 dp_get_adjust_train(dp_info->link_status, dp_info->dp_lane_count, dp_info->train_set); 766 767 radeon_dp_update_vs_emph(dp_info); 768 dp_info->tries++; 769 } 770 771 if (!channel_eq) { 772 DRM_ERROR("channel eq failed\n"); 773 return -1; 774 } else { 775 DRM_DEBUG_KMS("channel eq at voltage %d pre-emphasis %d\n", 776 dp_info->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK, 777 (dp_info->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) 778 >> DP_TRAIN_PRE_EMPHASIS_SHIFT); 779 return 0; 780 } 781 } 782 783 void radeon_dp_link_train(struct drm_encoder *encoder, 784 struct drm_connector *connector) 785 { 786 struct drm_device *dev = encoder->dev; 787 struct radeon_device *rdev = dev->dev_private; 788 struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder); 789 struct radeon_encoder_atom_dig *dig; 790 struct radeon_connector *radeon_connector; 791 struct radeon_connector_atom_dig *dig_connector; 792 struct radeon_dp_link_train_info dp_info; 793 int index; 794 u8 tmp, frev, crev; 795 796 if (!radeon_encoder->enc_priv) 797 return; 798 dig = radeon_encoder->enc_priv; 799 800 radeon_connector = to_radeon_connector(connector); 801 if (!radeon_connector->con_priv) 802 return; 803 dig_connector = radeon_connector->con_priv; 804 805 if ((dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_DISPLAYPORT) && 806 (dig_connector->dp_sink_type != CONNECTOR_OBJECT_ID_eDP)) 807 return; 808 809 /* DPEncoderService newer than 1.1 can't program properly the 810 * training pattern. When facing such version use the 811 * DIGXEncoderControl (X== 1 | 2) 812 */ 813 dp_info.use_dpencoder = true; 814 index = GetIndexIntoMasterTable(COMMAND, DPEncoderService); 815 if (atom_parse_cmd_header(rdev->mode_info.atom_context, index, &frev, &crev)) { 816 if (crev > 1) 817 dp_info.use_dpencoder = false; 818 } 819 820 dp_info.enc_id = 0; 821 if (dig->dig_encoder) 822 dp_info.enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER; 823 else 824 dp_info.enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER; 825 if (dig->linkb) 826 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_B; 827 else 828 dp_info.enc_id |= ATOM_DP_CONFIG_LINK_A; 829 830 if (drm_dp_dpcd_readb(&radeon_connector->ddc_bus->aux, DP_MAX_LANE_COUNT, &tmp) 831 == 1) { 832 if (ASIC_IS_DCE5(rdev) && (tmp & DP_TPS3_SUPPORTED)) 833 dp_info.tp3_supported = true; 834 else 835 dp_info.tp3_supported = false; 836 } else { 837 dp_info.tp3_supported = false; 838 } 839 840 memcpy(dp_info.dpcd, dig_connector->dpcd, DP_RECEIVER_CAP_SIZE); 841 dp_info.rdev = rdev; 842 dp_info.encoder = encoder; 843 dp_info.connector = connector; 844 dp_info.dp_lane_count = dig_connector->dp_lane_count; 845 dp_info.dp_clock = dig_connector->dp_clock; 846 dp_info.aux = &radeon_connector->ddc_bus->aux; 847 848 if (radeon_dp_link_train_init(&dp_info)) 849 goto done; 850 if (radeon_dp_link_train_cr(&dp_info)) 851 goto done; 852 if (radeon_dp_link_train_ce(&dp_info)) 853 goto done; 854 done: 855 if (radeon_dp_link_train_finish(&dp_info)) 856 return; 857 } 858