1 /* 2 * Analogix DP (Display Port) core interface driver. 3 * 4 * Copyright (C) 2012 Samsung Electronics Co., Ltd. 5 * Author: Jingoo Han <jg1.han@samsung.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 */ 12 13 #include <linux/module.h> 14 #include <linux/platform_device.h> 15 #include <linux/err.h> 16 #include <linux/clk.h> 17 #include <linux/io.h> 18 #include <linux/interrupt.h> 19 #include <linux/of.h> 20 #include <linux/of_gpio.h> 21 #include <linux/gpio.h> 22 #include <linux/component.h> 23 #include <linux/phy/phy.h> 24 25 #include <drm/drmP.h> 26 #include <drm/drm_atomic_helper.h> 27 #include <drm/drm_crtc.h> 28 #include <drm/drm_crtc_helper.h> 29 #include <drm/drm_panel.h> 30 31 #include <drm/bridge/analogix_dp.h> 32 33 #include "analogix_dp_core.h" 34 #include "analogix_dp_reg.h" 35 36 #define to_dp(nm) container_of(nm, struct analogix_dp_device, nm) 37 38 struct bridge_init { 39 struct i2c_client *client; 40 struct device_node *node; 41 }; 42 43 static void analogix_dp_init_dp(struct analogix_dp_device *dp) 44 { 45 analogix_dp_reset(dp); 46 47 analogix_dp_swreset(dp); 48 49 analogix_dp_init_analog_param(dp); 50 analogix_dp_init_interrupt(dp); 51 52 /* SW defined function Normal operation */ 53 analogix_dp_enable_sw_function(dp); 54 55 analogix_dp_config_interrupt(dp); 56 analogix_dp_init_analog_func(dp); 57 58 analogix_dp_init_hpd(dp); 59 analogix_dp_init_aux(dp); 60 } 61 62 static int analogix_dp_detect_hpd(struct analogix_dp_device *dp) 63 { 64 int timeout_loop = 0; 65 66 while (timeout_loop < DP_TIMEOUT_LOOP_COUNT) { 67 if (analogix_dp_get_plug_in_status(dp) == 0) 68 return 0; 69 70 timeout_loop++; 71 usleep_range(10, 11); 72 } 73 74 /* 75 * Some edp screen do not have hpd signal, so we can't just 76 * return failed when hpd plug in detect failed, DT property 77 * "force-hpd" would indicate whether driver need this. 78 */ 79 if (!dp->force_hpd) 80 return -ETIMEDOUT; 81 82 /* 83 * The eDP TRM indicate that if HPD_STATUS(RO) is 0, AUX CH 84 * will not work, so we need to give a force hpd action to 85 * set HPD_STATUS manually. 86 */ 87 dev_dbg(dp->dev, "failed to get hpd plug status, try to force hpd\n"); 88 89 analogix_dp_force_hpd(dp); 90 91 if (analogix_dp_get_plug_in_status(dp) != 0) { 92 dev_err(dp->dev, "failed to get hpd plug in status\n"); 93 return -EINVAL; 94 } 95 96 dev_dbg(dp->dev, "success to get plug in status after force hpd\n"); 97 98 return 0; 99 } 100 101 int analogix_dp_psr_supported(struct device *dev) 102 { 103 struct analogix_dp_device *dp = dev_get_drvdata(dev); 104 105 return dp->psr_support; 106 } 107 EXPORT_SYMBOL_GPL(analogix_dp_psr_supported); 108 109 int analogix_dp_enable_psr(struct device *dev) 110 { 111 struct analogix_dp_device *dp = dev_get_drvdata(dev); 112 struct edp_vsc_psr psr_vsc; 113 114 if (!dp->psr_support) 115 return 0; 116 117 /* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */ 118 memset(&psr_vsc, 0, sizeof(psr_vsc)); 119 psr_vsc.sdp_header.HB0 = 0; 120 psr_vsc.sdp_header.HB1 = 0x7; 121 psr_vsc.sdp_header.HB2 = 0x2; 122 psr_vsc.sdp_header.HB3 = 0x8; 123 124 psr_vsc.DB0 = 0; 125 psr_vsc.DB1 = EDP_VSC_PSR_STATE_ACTIVE | EDP_VSC_PSR_CRC_VALUES_VALID; 126 127 analogix_dp_send_psr_spd(dp, &psr_vsc); 128 return 0; 129 } 130 EXPORT_SYMBOL_GPL(analogix_dp_enable_psr); 131 132 int analogix_dp_disable_psr(struct device *dev) 133 { 134 struct analogix_dp_device *dp = dev_get_drvdata(dev); 135 struct edp_vsc_psr psr_vsc; 136 int ret; 137 138 if (!dp->psr_support) 139 return 0; 140 141 /* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */ 142 memset(&psr_vsc, 0, sizeof(psr_vsc)); 143 psr_vsc.sdp_header.HB0 = 0; 144 psr_vsc.sdp_header.HB1 = 0x7; 145 psr_vsc.sdp_header.HB2 = 0x2; 146 psr_vsc.sdp_header.HB3 = 0x8; 147 148 psr_vsc.DB0 = 0; 149 psr_vsc.DB1 = 0; 150 151 ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D0); 152 if (ret != 1) 153 dev_err(dp->dev, "Failed to set DP Power0 %d\n", ret); 154 155 analogix_dp_send_psr_spd(dp, &psr_vsc); 156 return 0; 157 } 158 EXPORT_SYMBOL_GPL(analogix_dp_disable_psr); 159 160 static bool analogix_dp_detect_sink_psr(struct analogix_dp_device *dp) 161 { 162 unsigned char psr_version; 163 164 drm_dp_dpcd_readb(&dp->aux, DP_PSR_SUPPORT, &psr_version); 165 dev_dbg(dp->dev, "Panel PSR version : %x\n", psr_version); 166 167 return (psr_version & DP_PSR_IS_SUPPORTED) ? true : false; 168 } 169 170 static void analogix_dp_enable_sink_psr(struct analogix_dp_device *dp) 171 { 172 unsigned char psr_en; 173 174 /* Disable psr function */ 175 drm_dp_dpcd_readb(&dp->aux, DP_PSR_EN_CFG, &psr_en); 176 psr_en &= ~DP_PSR_ENABLE; 177 drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en); 178 179 /* Main-Link transmitter remains active during PSR active states */ 180 psr_en = DP_PSR_MAIN_LINK_ACTIVE | DP_PSR_CRC_VERIFICATION; 181 drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en); 182 183 /* Enable psr function */ 184 psr_en = DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE | 185 DP_PSR_CRC_VERIFICATION; 186 drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en); 187 188 analogix_dp_enable_psr_crc(dp); 189 } 190 191 static void 192 analogix_dp_enable_rx_to_enhanced_mode(struct analogix_dp_device *dp, 193 bool enable) 194 { 195 u8 data; 196 197 drm_dp_dpcd_readb(&dp->aux, DP_LANE_COUNT_SET, &data); 198 199 if (enable) 200 drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, 201 DP_LANE_COUNT_ENHANCED_FRAME_EN | 202 DPCD_LANE_COUNT_SET(data)); 203 else 204 drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, 205 DPCD_LANE_COUNT_SET(data)); 206 } 207 208 static int analogix_dp_is_enhanced_mode_available(struct analogix_dp_device *dp) 209 { 210 u8 data; 211 int retval; 212 213 drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data); 214 retval = DPCD_ENHANCED_FRAME_CAP(data); 215 216 return retval; 217 } 218 219 static void analogix_dp_set_enhanced_mode(struct analogix_dp_device *dp) 220 { 221 u8 data; 222 223 data = analogix_dp_is_enhanced_mode_available(dp); 224 analogix_dp_enable_rx_to_enhanced_mode(dp, data); 225 analogix_dp_enable_enhanced_mode(dp, data); 226 } 227 228 static void analogix_dp_training_pattern_dis(struct analogix_dp_device *dp) 229 { 230 analogix_dp_set_training_pattern(dp, DP_NONE); 231 232 drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, 233 DP_TRAINING_PATTERN_DISABLE); 234 } 235 236 static void 237 analogix_dp_set_lane_lane_pre_emphasis(struct analogix_dp_device *dp, 238 int pre_emphasis, int lane) 239 { 240 switch (lane) { 241 case 0: 242 analogix_dp_set_lane0_pre_emphasis(dp, pre_emphasis); 243 break; 244 case 1: 245 analogix_dp_set_lane1_pre_emphasis(dp, pre_emphasis); 246 break; 247 248 case 2: 249 analogix_dp_set_lane2_pre_emphasis(dp, pre_emphasis); 250 break; 251 252 case 3: 253 analogix_dp_set_lane3_pre_emphasis(dp, pre_emphasis); 254 break; 255 } 256 } 257 258 static int analogix_dp_link_start(struct analogix_dp_device *dp) 259 { 260 u8 buf[4]; 261 int lane, lane_count, pll_tries, retval; 262 263 lane_count = dp->link_train.lane_count; 264 265 dp->link_train.lt_state = CLOCK_RECOVERY; 266 dp->link_train.eq_loop = 0; 267 268 for (lane = 0; lane < lane_count; lane++) 269 dp->link_train.cr_loop[lane] = 0; 270 271 /* Set link rate and count as you want to establish*/ 272 analogix_dp_set_link_bandwidth(dp, dp->link_train.link_rate); 273 analogix_dp_set_lane_count(dp, dp->link_train.lane_count); 274 275 /* Setup RX configuration */ 276 buf[0] = dp->link_train.link_rate; 277 buf[1] = dp->link_train.lane_count; 278 retval = drm_dp_dpcd_write(&dp->aux, DP_LINK_BW_SET, buf, 2); 279 if (retval < 0) 280 return retval; 281 282 /* Set TX pre-emphasis to minimum */ 283 for (lane = 0; lane < lane_count; lane++) 284 analogix_dp_set_lane_lane_pre_emphasis(dp, 285 PRE_EMPHASIS_LEVEL_0, lane); 286 287 /* Wait for PLL lock */ 288 pll_tries = 0; 289 while (analogix_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) { 290 if (pll_tries == DP_TIMEOUT_LOOP_COUNT) { 291 dev_err(dp->dev, "Wait for PLL lock timed out\n"); 292 return -ETIMEDOUT; 293 } 294 295 pll_tries++; 296 usleep_range(90, 120); 297 } 298 299 /* Set training pattern 1 */ 300 analogix_dp_set_training_pattern(dp, TRAINING_PTN1); 301 302 /* Set RX training pattern */ 303 retval = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, 304 DP_LINK_SCRAMBLING_DISABLE | 305 DP_TRAINING_PATTERN_1); 306 if (retval < 0) 307 return retval; 308 309 for (lane = 0; lane < lane_count; lane++) 310 buf[lane] = DP_TRAIN_PRE_EMPH_LEVEL_0 | 311 DP_TRAIN_VOLTAGE_SWING_LEVEL_0; 312 313 retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, buf, 314 lane_count); 315 if (retval < 0) 316 return retval; 317 318 return 0; 319 } 320 321 static unsigned char analogix_dp_get_lane_status(u8 link_status[2], int lane) 322 { 323 int shift = (lane & 1) * 4; 324 u8 link_value = link_status[lane >> 1]; 325 326 return (link_value >> shift) & 0xf; 327 } 328 329 static int analogix_dp_clock_recovery_ok(u8 link_status[2], int lane_count) 330 { 331 int lane; 332 u8 lane_status; 333 334 for (lane = 0; lane < lane_count; lane++) { 335 lane_status = analogix_dp_get_lane_status(link_status, lane); 336 if ((lane_status & DP_LANE_CR_DONE) == 0) 337 return -EINVAL; 338 } 339 return 0; 340 } 341 342 static int analogix_dp_channel_eq_ok(u8 link_status[2], u8 link_align, 343 int lane_count) 344 { 345 int lane; 346 u8 lane_status; 347 348 if ((link_align & DP_INTERLANE_ALIGN_DONE) == 0) 349 return -EINVAL; 350 351 for (lane = 0; lane < lane_count; lane++) { 352 lane_status = analogix_dp_get_lane_status(link_status, lane); 353 lane_status &= DP_CHANNEL_EQ_BITS; 354 if (lane_status != DP_CHANNEL_EQ_BITS) 355 return -EINVAL; 356 } 357 358 return 0; 359 } 360 361 static unsigned char 362 analogix_dp_get_adjust_request_voltage(u8 adjust_request[2], int lane) 363 { 364 int shift = (lane & 1) * 4; 365 u8 link_value = adjust_request[lane >> 1]; 366 367 return (link_value >> shift) & 0x3; 368 } 369 370 static unsigned char analogix_dp_get_adjust_request_pre_emphasis( 371 u8 adjust_request[2], 372 int lane) 373 { 374 int shift = (lane & 1) * 4; 375 u8 link_value = adjust_request[lane >> 1]; 376 377 return ((link_value >> shift) & 0xc) >> 2; 378 } 379 380 static void analogix_dp_set_lane_link_training(struct analogix_dp_device *dp, 381 u8 training_lane_set, int lane) 382 { 383 switch (lane) { 384 case 0: 385 analogix_dp_set_lane0_link_training(dp, training_lane_set); 386 break; 387 case 1: 388 analogix_dp_set_lane1_link_training(dp, training_lane_set); 389 break; 390 391 case 2: 392 analogix_dp_set_lane2_link_training(dp, training_lane_set); 393 break; 394 395 case 3: 396 analogix_dp_set_lane3_link_training(dp, training_lane_set); 397 break; 398 } 399 } 400 401 static unsigned int 402 analogix_dp_get_lane_link_training(struct analogix_dp_device *dp, 403 int lane) 404 { 405 u32 reg; 406 407 switch (lane) { 408 case 0: 409 reg = analogix_dp_get_lane0_link_training(dp); 410 break; 411 case 1: 412 reg = analogix_dp_get_lane1_link_training(dp); 413 break; 414 case 2: 415 reg = analogix_dp_get_lane2_link_training(dp); 416 break; 417 case 3: 418 reg = analogix_dp_get_lane3_link_training(dp); 419 break; 420 default: 421 WARN_ON(1); 422 return 0; 423 } 424 425 return reg; 426 } 427 428 static void analogix_dp_reduce_link_rate(struct analogix_dp_device *dp) 429 { 430 analogix_dp_training_pattern_dis(dp); 431 analogix_dp_set_enhanced_mode(dp); 432 433 dp->link_train.lt_state = FAILED; 434 } 435 436 static void analogix_dp_get_adjust_training_lane(struct analogix_dp_device *dp, 437 u8 adjust_request[2]) 438 { 439 int lane, lane_count; 440 u8 voltage_swing, pre_emphasis, training_lane; 441 442 lane_count = dp->link_train.lane_count; 443 for (lane = 0; lane < lane_count; lane++) { 444 voltage_swing = analogix_dp_get_adjust_request_voltage( 445 adjust_request, lane); 446 pre_emphasis = analogix_dp_get_adjust_request_pre_emphasis( 447 adjust_request, lane); 448 training_lane = DPCD_VOLTAGE_SWING_SET(voltage_swing) | 449 DPCD_PRE_EMPHASIS_SET(pre_emphasis); 450 451 if (voltage_swing == VOLTAGE_LEVEL_3) 452 training_lane |= DP_TRAIN_MAX_SWING_REACHED; 453 if (pre_emphasis == PRE_EMPHASIS_LEVEL_3) 454 training_lane |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; 455 456 dp->link_train.training_lane[lane] = training_lane; 457 } 458 } 459 460 static int analogix_dp_process_clock_recovery(struct analogix_dp_device *dp) 461 { 462 int lane, lane_count, retval; 463 u8 voltage_swing, pre_emphasis, training_lane; 464 u8 link_status[2], adjust_request[2]; 465 466 usleep_range(100, 101); 467 468 lane_count = dp->link_train.lane_count; 469 470 retval = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status, 2); 471 if (retval < 0) 472 return retval; 473 474 retval = drm_dp_dpcd_read(&dp->aux, DP_ADJUST_REQUEST_LANE0_1, 475 adjust_request, 2); 476 if (retval < 0) 477 return retval; 478 479 if (analogix_dp_clock_recovery_ok(link_status, lane_count) == 0) { 480 /* set training pattern 2 for EQ */ 481 analogix_dp_set_training_pattern(dp, TRAINING_PTN2); 482 483 retval = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, 484 DP_LINK_SCRAMBLING_DISABLE | 485 DP_TRAINING_PATTERN_2); 486 if (retval < 0) 487 return retval; 488 489 dev_info(dp->dev, "Link Training Clock Recovery success\n"); 490 dp->link_train.lt_state = EQUALIZER_TRAINING; 491 } else { 492 for (lane = 0; lane < lane_count; lane++) { 493 training_lane = analogix_dp_get_lane_link_training( 494 dp, lane); 495 voltage_swing = analogix_dp_get_adjust_request_voltage( 496 adjust_request, lane); 497 pre_emphasis = analogix_dp_get_adjust_request_pre_emphasis( 498 adjust_request, lane); 499 500 if (DPCD_VOLTAGE_SWING_GET(training_lane) == 501 voltage_swing && 502 DPCD_PRE_EMPHASIS_GET(training_lane) == 503 pre_emphasis) 504 dp->link_train.cr_loop[lane]++; 505 506 if (dp->link_train.cr_loop[lane] == MAX_CR_LOOP || 507 voltage_swing == VOLTAGE_LEVEL_3 || 508 pre_emphasis == PRE_EMPHASIS_LEVEL_3) { 509 dev_err(dp->dev, "CR Max reached (%d,%d,%d)\n", 510 dp->link_train.cr_loop[lane], 511 voltage_swing, pre_emphasis); 512 analogix_dp_reduce_link_rate(dp); 513 return -EIO; 514 } 515 } 516 } 517 518 analogix_dp_get_adjust_training_lane(dp, adjust_request); 519 520 for (lane = 0; lane < lane_count; lane++) 521 analogix_dp_set_lane_link_training(dp, 522 dp->link_train.training_lane[lane], lane); 523 524 retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, 525 dp->link_train.training_lane, lane_count); 526 if (retval < 0) 527 return retval; 528 529 return 0; 530 } 531 532 static int analogix_dp_process_equalizer_training(struct analogix_dp_device *dp) 533 { 534 int lane, lane_count, retval; 535 u32 reg; 536 u8 link_align, link_status[2], adjust_request[2]; 537 538 usleep_range(400, 401); 539 540 lane_count = dp->link_train.lane_count; 541 542 retval = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status, 2); 543 if (retval < 0) 544 return retval; 545 546 if (analogix_dp_clock_recovery_ok(link_status, lane_count)) { 547 analogix_dp_reduce_link_rate(dp); 548 return -EIO; 549 } 550 551 retval = drm_dp_dpcd_read(&dp->aux, DP_ADJUST_REQUEST_LANE0_1, 552 adjust_request, 2); 553 if (retval < 0) 554 return retval; 555 556 retval = drm_dp_dpcd_readb(&dp->aux, DP_LANE_ALIGN_STATUS_UPDATED, 557 &link_align); 558 if (retval < 0) 559 return retval; 560 561 analogix_dp_get_adjust_training_lane(dp, adjust_request); 562 563 if (!analogix_dp_channel_eq_ok(link_status, link_align, lane_count)) { 564 /* traing pattern Set to Normal */ 565 analogix_dp_training_pattern_dis(dp); 566 567 dev_info(dp->dev, "Link Training success!\n"); 568 569 analogix_dp_get_link_bandwidth(dp, ®); 570 dp->link_train.link_rate = reg; 571 dev_dbg(dp->dev, "final bandwidth = %.2x\n", 572 dp->link_train.link_rate); 573 574 analogix_dp_get_lane_count(dp, ®); 575 dp->link_train.lane_count = reg; 576 dev_dbg(dp->dev, "final lane count = %.2x\n", 577 dp->link_train.lane_count); 578 579 /* set enhanced mode if available */ 580 analogix_dp_set_enhanced_mode(dp); 581 dp->link_train.lt_state = FINISHED; 582 583 return 0; 584 } 585 586 /* not all locked */ 587 dp->link_train.eq_loop++; 588 589 if (dp->link_train.eq_loop > MAX_EQ_LOOP) { 590 dev_err(dp->dev, "EQ Max loop\n"); 591 analogix_dp_reduce_link_rate(dp); 592 return -EIO; 593 } 594 595 for (lane = 0; lane < lane_count; lane++) 596 analogix_dp_set_lane_link_training(dp, 597 dp->link_train.training_lane[lane], lane); 598 599 retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, 600 dp->link_train.training_lane, lane_count); 601 if (retval < 0) 602 return retval; 603 604 return 0; 605 } 606 607 static void analogix_dp_get_max_rx_bandwidth(struct analogix_dp_device *dp, 608 u8 *bandwidth) 609 { 610 u8 data; 611 612 /* 613 * For DP rev.1.1, Maximum link rate of Main Link lanes 614 * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps 615 * For DP rev.1.2, Maximum link rate of Main Link lanes 616 * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps, 0x14 = 5.4Gbps 617 */ 618 drm_dp_dpcd_readb(&dp->aux, DP_MAX_LINK_RATE, &data); 619 *bandwidth = data; 620 } 621 622 static void analogix_dp_get_max_rx_lane_count(struct analogix_dp_device *dp, 623 u8 *lane_count) 624 { 625 u8 data; 626 627 /* 628 * For DP rev.1.1, Maximum number of Main Link lanes 629 * 0x01 = 1 lane, 0x02 = 2 lanes, 0x04 = 4 lanes 630 */ 631 drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data); 632 *lane_count = DPCD_MAX_LANE_COUNT(data); 633 } 634 635 static void analogix_dp_init_training(struct analogix_dp_device *dp, 636 enum link_lane_count_type max_lane, 637 int max_rate) 638 { 639 /* 640 * MACRO_RST must be applied after the PLL_LOCK to avoid 641 * the DP inter pair skew issue for at least 10 us 642 */ 643 analogix_dp_reset_macro(dp); 644 645 /* Initialize by reading RX's DPCD */ 646 analogix_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate); 647 analogix_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count); 648 649 if ((dp->link_train.link_rate != DP_LINK_BW_1_62) && 650 (dp->link_train.link_rate != DP_LINK_BW_2_7) && 651 (dp->link_train.link_rate != DP_LINK_BW_5_4)) { 652 dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n", 653 dp->link_train.link_rate); 654 dp->link_train.link_rate = DP_LINK_BW_1_62; 655 } 656 657 if (dp->link_train.lane_count == 0) { 658 dev_err(dp->dev, "Rx Max Lane count is abnormal :%x !\n", 659 dp->link_train.lane_count); 660 dp->link_train.lane_count = (u8)LANE_COUNT1; 661 } 662 663 /* Setup TX lane count & rate */ 664 if (dp->link_train.lane_count > max_lane) 665 dp->link_train.lane_count = max_lane; 666 if (dp->link_train.link_rate > max_rate) 667 dp->link_train.link_rate = max_rate; 668 669 /* All DP analog module power up */ 670 analogix_dp_set_analog_power_down(dp, POWER_ALL, 0); 671 } 672 673 static int analogix_dp_sw_link_training(struct analogix_dp_device *dp) 674 { 675 int retval = 0, training_finished = 0; 676 677 dp->link_train.lt_state = START; 678 679 /* Process here */ 680 while (!retval && !training_finished) { 681 switch (dp->link_train.lt_state) { 682 case START: 683 retval = analogix_dp_link_start(dp); 684 if (retval) 685 dev_err(dp->dev, "LT link start failed!\n"); 686 break; 687 case CLOCK_RECOVERY: 688 retval = analogix_dp_process_clock_recovery(dp); 689 if (retval) 690 dev_err(dp->dev, "LT CR failed!\n"); 691 break; 692 case EQUALIZER_TRAINING: 693 retval = analogix_dp_process_equalizer_training(dp); 694 if (retval) 695 dev_err(dp->dev, "LT EQ failed!\n"); 696 break; 697 case FINISHED: 698 training_finished = 1; 699 break; 700 case FAILED: 701 return -EREMOTEIO; 702 } 703 } 704 if (retval) 705 dev_err(dp->dev, "eDP link training failed (%d)\n", retval); 706 707 return retval; 708 } 709 710 static int analogix_dp_set_link_train(struct analogix_dp_device *dp, 711 u32 count, u32 bwtype) 712 { 713 int i; 714 int retval; 715 716 for (i = 0; i < DP_TIMEOUT_LOOP_COUNT; i++) { 717 analogix_dp_init_training(dp, count, bwtype); 718 retval = analogix_dp_sw_link_training(dp); 719 if (retval == 0) 720 break; 721 722 usleep_range(100, 110); 723 } 724 725 return retval; 726 } 727 728 static int analogix_dp_config_video(struct analogix_dp_device *dp) 729 { 730 int retval = 0; 731 int timeout_loop = 0; 732 int done_count = 0; 733 734 analogix_dp_config_video_slave_mode(dp); 735 736 analogix_dp_set_video_color_format(dp); 737 738 if (analogix_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) { 739 dev_err(dp->dev, "PLL is not locked yet.\n"); 740 return -EINVAL; 741 } 742 743 for (;;) { 744 timeout_loop++; 745 if (analogix_dp_is_slave_video_stream_clock_on(dp) == 0) 746 break; 747 if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) { 748 dev_err(dp->dev, "Timeout of video streamclk ok\n"); 749 return -ETIMEDOUT; 750 } 751 752 usleep_range(1, 2); 753 } 754 755 /* Set to use the register calculated M/N video */ 756 analogix_dp_set_video_cr_mn(dp, CALCULATED_M, 0, 0); 757 758 /* For video bist, Video timing must be generated by register */ 759 analogix_dp_set_video_timing_mode(dp, VIDEO_TIMING_FROM_CAPTURE); 760 761 /* Disable video mute */ 762 analogix_dp_enable_video_mute(dp, 0); 763 764 /* Configure video slave mode */ 765 analogix_dp_enable_video_master(dp, 0); 766 767 timeout_loop = 0; 768 769 for (;;) { 770 timeout_loop++; 771 if (analogix_dp_is_video_stream_on(dp) == 0) { 772 done_count++; 773 if (done_count > 10) 774 break; 775 } else if (done_count) { 776 done_count = 0; 777 } 778 if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) { 779 dev_err(dp->dev, "Timeout of video streamclk ok\n"); 780 return -ETIMEDOUT; 781 } 782 783 usleep_range(1000, 1001); 784 } 785 786 if (retval != 0) 787 dev_err(dp->dev, "Video stream is not detected!\n"); 788 789 return retval; 790 } 791 792 static void analogix_dp_enable_scramble(struct analogix_dp_device *dp, 793 bool enable) 794 { 795 u8 data; 796 797 if (enable) { 798 analogix_dp_enable_scrambling(dp); 799 800 drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET, &data); 801 drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, 802 (u8)(data & ~DP_LINK_SCRAMBLING_DISABLE)); 803 } else { 804 analogix_dp_disable_scrambling(dp); 805 806 drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET, &data); 807 drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, 808 (u8)(data | DP_LINK_SCRAMBLING_DISABLE)); 809 } 810 } 811 812 static irqreturn_t analogix_dp_hardirq(int irq, void *arg) 813 { 814 struct analogix_dp_device *dp = arg; 815 irqreturn_t ret = IRQ_NONE; 816 enum dp_irq_type irq_type; 817 818 irq_type = analogix_dp_get_irq_type(dp); 819 if (irq_type != DP_IRQ_TYPE_UNKNOWN) { 820 analogix_dp_mute_hpd_interrupt(dp); 821 ret = IRQ_WAKE_THREAD; 822 } 823 824 return ret; 825 } 826 827 static irqreturn_t analogix_dp_irq_thread(int irq, void *arg) 828 { 829 struct analogix_dp_device *dp = arg; 830 enum dp_irq_type irq_type; 831 832 irq_type = analogix_dp_get_irq_type(dp); 833 if (irq_type & DP_IRQ_TYPE_HP_CABLE_IN || 834 irq_type & DP_IRQ_TYPE_HP_CABLE_OUT) { 835 dev_dbg(dp->dev, "Detected cable status changed!\n"); 836 if (dp->drm_dev) 837 drm_helper_hpd_irq_event(dp->drm_dev); 838 } 839 840 if (irq_type != DP_IRQ_TYPE_UNKNOWN) { 841 analogix_dp_clear_hotplug_interrupts(dp); 842 analogix_dp_unmute_hpd_interrupt(dp); 843 } 844 845 return IRQ_HANDLED; 846 } 847 848 static void analogix_dp_commit(struct analogix_dp_device *dp) 849 { 850 int ret; 851 852 /* Keep the panel disabled while we configure video */ 853 if (dp->plat_data->panel) { 854 if (drm_panel_disable(dp->plat_data->panel)) 855 DRM_ERROR("failed to disable the panel\n"); 856 } 857 858 ret = analogix_dp_set_link_train(dp, dp->video_info.max_lane_count, 859 dp->video_info.max_link_rate); 860 if (ret) { 861 dev_err(dp->dev, "unable to do link train\n"); 862 return; 863 } 864 865 analogix_dp_enable_scramble(dp, 1); 866 analogix_dp_enable_rx_to_enhanced_mode(dp, 1); 867 analogix_dp_enable_enhanced_mode(dp, 1); 868 869 analogix_dp_init_video(dp); 870 ret = analogix_dp_config_video(dp); 871 if (ret) 872 dev_err(dp->dev, "unable to config video\n"); 873 874 /* Safe to enable the panel now */ 875 if (dp->plat_data->panel) { 876 if (drm_panel_enable(dp->plat_data->panel)) 877 DRM_ERROR("failed to enable the panel\n"); 878 } 879 880 /* Enable video */ 881 analogix_dp_start_video(dp); 882 883 dp->psr_support = analogix_dp_detect_sink_psr(dp); 884 if (dp->psr_support) 885 analogix_dp_enable_sink_psr(dp); 886 } 887 888 /* 889 * This function is a bit of a catch-all for panel preparation, hopefully 890 * simplifying the logic of functions that need to prepare/unprepare the panel 891 * below. 892 * 893 * If @prepare is true, this function will prepare the panel. Conversely, if it 894 * is false, the panel will be unprepared. 895 * 896 * If @is_modeset_prepare is true, the function will disregard the current state 897 * of the panel and either prepare/unprepare the panel based on @prepare. Once 898 * it finishes, it will update dp->panel_is_modeset to reflect the current state 899 * of the panel. 900 */ 901 static int analogix_dp_prepare_panel(struct analogix_dp_device *dp, 902 bool prepare, bool is_modeset_prepare) 903 { 904 int ret = 0; 905 906 if (!dp->plat_data->panel) 907 return 0; 908 909 mutex_lock(&dp->panel_lock); 910 911 /* 912 * Exit early if this is a temporary prepare/unprepare and we're already 913 * modeset (since we neither want to prepare twice or unprepare early). 914 */ 915 if (dp->panel_is_modeset && !is_modeset_prepare) 916 goto out; 917 918 if (prepare) 919 ret = drm_panel_prepare(dp->plat_data->panel); 920 else 921 ret = drm_panel_unprepare(dp->plat_data->panel); 922 923 if (ret) 924 goto out; 925 926 if (is_modeset_prepare) 927 dp->panel_is_modeset = prepare; 928 929 out: 930 mutex_unlock(&dp->panel_lock); 931 return ret; 932 } 933 934 static int analogix_dp_get_modes(struct drm_connector *connector) 935 { 936 struct analogix_dp_device *dp = to_dp(connector); 937 struct edid *edid; 938 int ret, num_modes = 0; 939 940 if (dp->plat_data->panel) { 941 num_modes += drm_panel_get_modes(dp->plat_data->panel); 942 } else { 943 ret = analogix_dp_prepare_panel(dp, true, false); 944 if (ret) { 945 DRM_ERROR("Failed to prepare panel (%d)\n", ret); 946 return 0; 947 } 948 949 edid = drm_get_edid(connector, &dp->aux.ddc); 950 if (edid) { 951 drm_mode_connector_update_edid_property(&dp->connector, 952 edid); 953 num_modes += drm_add_edid_modes(&dp->connector, edid); 954 kfree(edid); 955 } 956 957 ret = analogix_dp_prepare_panel(dp, false, false); 958 if (ret) 959 DRM_ERROR("Failed to unprepare panel (%d)\n", ret); 960 } 961 962 if (dp->plat_data->get_modes) 963 num_modes += dp->plat_data->get_modes(dp->plat_data, connector); 964 965 return num_modes; 966 } 967 968 static struct drm_encoder * 969 analogix_dp_best_encoder(struct drm_connector *connector) 970 { 971 struct analogix_dp_device *dp = to_dp(connector); 972 973 return dp->encoder; 974 } 975 976 static const struct drm_connector_helper_funcs analogix_dp_connector_helper_funcs = { 977 .get_modes = analogix_dp_get_modes, 978 .best_encoder = analogix_dp_best_encoder, 979 }; 980 981 static enum drm_connector_status 982 analogix_dp_detect(struct drm_connector *connector, bool force) 983 { 984 struct analogix_dp_device *dp = to_dp(connector); 985 enum drm_connector_status status = connector_status_disconnected; 986 int ret; 987 988 if (dp->plat_data->panel) 989 return connector_status_connected; 990 991 ret = analogix_dp_prepare_panel(dp, true, false); 992 if (ret) { 993 DRM_ERROR("Failed to prepare panel (%d)\n", ret); 994 return connector_status_disconnected; 995 } 996 997 if (!analogix_dp_detect_hpd(dp)) 998 status = connector_status_connected; 999 1000 ret = analogix_dp_prepare_panel(dp, false, false); 1001 if (ret) 1002 DRM_ERROR("Failed to unprepare panel (%d)\n", ret); 1003 1004 return status; 1005 } 1006 1007 static const struct drm_connector_funcs analogix_dp_connector_funcs = { 1008 .dpms = drm_atomic_helper_connector_dpms, 1009 .fill_modes = drm_helper_probe_single_connector_modes, 1010 .detect = analogix_dp_detect, 1011 .destroy = drm_connector_cleanup, 1012 .reset = drm_atomic_helper_connector_reset, 1013 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 1014 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 1015 }; 1016 1017 static int analogix_dp_bridge_attach(struct drm_bridge *bridge) 1018 { 1019 struct analogix_dp_device *dp = bridge->driver_private; 1020 struct drm_encoder *encoder = dp->encoder; 1021 struct drm_connector *connector = &dp->connector; 1022 int ret; 1023 1024 if (!bridge->encoder) { 1025 DRM_ERROR("Parent encoder object not found"); 1026 return -ENODEV; 1027 } 1028 1029 connector->polled = DRM_CONNECTOR_POLL_HPD; 1030 1031 ret = drm_connector_init(dp->drm_dev, connector, 1032 &analogix_dp_connector_funcs, 1033 DRM_MODE_CONNECTOR_eDP); 1034 if (ret) { 1035 DRM_ERROR("Failed to initialize connector with drm\n"); 1036 return ret; 1037 } 1038 1039 drm_connector_helper_add(connector, 1040 &analogix_dp_connector_helper_funcs); 1041 drm_mode_connector_attach_encoder(connector, encoder); 1042 1043 /* 1044 * NOTE: the connector registration is implemented in analogix 1045 * platform driver, that to say connector would be exist after 1046 * plat_data->attch return, that's why we record the connector 1047 * point after plat attached. 1048 */ 1049 if (dp->plat_data->attach) { 1050 ret = dp->plat_data->attach(dp->plat_data, bridge, connector); 1051 if (ret) { 1052 DRM_ERROR("Failed at platform attch func\n"); 1053 return ret; 1054 } 1055 } 1056 1057 if (dp->plat_data->panel) { 1058 ret = drm_panel_attach(dp->plat_data->panel, &dp->connector); 1059 if (ret) { 1060 DRM_ERROR("Failed to attach panel\n"); 1061 return ret; 1062 } 1063 } 1064 1065 return 0; 1066 } 1067 1068 static void analogix_dp_bridge_pre_enable(struct drm_bridge *bridge) 1069 { 1070 struct analogix_dp_device *dp = bridge->driver_private; 1071 int ret; 1072 1073 ret = analogix_dp_prepare_panel(dp, true, true); 1074 if (ret) 1075 DRM_ERROR("failed to setup the panel ret = %d\n", ret); 1076 } 1077 1078 static void analogix_dp_bridge_enable(struct drm_bridge *bridge) 1079 { 1080 struct analogix_dp_device *dp = bridge->driver_private; 1081 1082 if (dp->dpms_mode == DRM_MODE_DPMS_ON) 1083 return; 1084 1085 pm_runtime_get_sync(dp->dev); 1086 1087 if (dp->plat_data->power_on) 1088 dp->plat_data->power_on(dp->plat_data); 1089 1090 phy_power_on(dp->phy); 1091 analogix_dp_init_dp(dp); 1092 enable_irq(dp->irq); 1093 analogix_dp_commit(dp); 1094 1095 dp->dpms_mode = DRM_MODE_DPMS_ON; 1096 } 1097 1098 static void analogix_dp_bridge_disable(struct drm_bridge *bridge) 1099 { 1100 struct analogix_dp_device *dp = bridge->driver_private; 1101 int ret; 1102 1103 if (dp->dpms_mode != DRM_MODE_DPMS_ON) 1104 return; 1105 1106 if (dp->plat_data->panel) { 1107 if (drm_panel_disable(dp->plat_data->panel)) { 1108 DRM_ERROR("failed to disable the panel\n"); 1109 return; 1110 } 1111 } 1112 1113 disable_irq(dp->irq); 1114 phy_power_off(dp->phy); 1115 1116 if (dp->plat_data->power_off) 1117 dp->plat_data->power_off(dp->plat_data); 1118 1119 pm_runtime_put_sync(dp->dev); 1120 1121 ret = analogix_dp_prepare_panel(dp, false, true); 1122 if (ret) 1123 DRM_ERROR("failed to setup the panel ret = %d\n", ret); 1124 1125 dp->dpms_mode = DRM_MODE_DPMS_OFF; 1126 } 1127 1128 static void analogix_dp_bridge_mode_set(struct drm_bridge *bridge, 1129 struct drm_display_mode *orig_mode, 1130 struct drm_display_mode *mode) 1131 { 1132 struct analogix_dp_device *dp = bridge->driver_private; 1133 struct drm_display_info *display_info = &dp->connector.display_info; 1134 struct video_info *video = &dp->video_info; 1135 struct device_node *dp_node = dp->dev->of_node; 1136 int vic; 1137 1138 /* Input video interlaces & hsync pol & vsync pol */ 1139 video->interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 1140 video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC); 1141 video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC); 1142 1143 /* Input video dynamic_range & colorimetry */ 1144 vic = drm_match_cea_mode(mode); 1145 if ((vic == 6) || (vic == 7) || (vic == 21) || (vic == 22) || 1146 (vic == 2) || (vic == 3) || (vic == 17) || (vic == 18)) { 1147 video->dynamic_range = CEA; 1148 video->ycbcr_coeff = COLOR_YCBCR601; 1149 } else if (vic) { 1150 video->dynamic_range = CEA; 1151 video->ycbcr_coeff = COLOR_YCBCR709; 1152 } else { 1153 video->dynamic_range = VESA; 1154 video->ycbcr_coeff = COLOR_YCBCR709; 1155 } 1156 1157 /* Input vide bpc and color_formats */ 1158 switch (display_info->bpc) { 1159 case 12: 1160 video->color_depth = COLOR_12; 1161 break; 1162 case 10: 1163 video->color_depth = COLOR_10; 1164 break; 1165 case 8: 1166 video->color_depth = COLOR_8; 1167 break; 1168 case 6: 1169 video->color_depth = COLOR_6; 1170 break; 1171 default: 1172 video->color_depth = COLOR_8; 1173 break; 1174 } 1175 if (display_info->color_formats & DRM_COLOR_FORMAT_YCRCB444) 1176 video->color_space = COLOR_YCBCR444; 1177 else if (display_info->color_formats & DRM_COLOR_FORMAT_YCRCB422) 1178 video->color_space = COLOR_YCBCR422; 1179 else if (display_info->color_formats & DRM_COLOR_FORMAT_RGB444) 1180 video->color_space = COLOR_RGB; 1181 else 1182 video->color_space = COLOR_RGB; 1183 1184 /* 1185 * NOTE: those property parsing code is used for providing backward 1186 * compatibility for samsung platform. 1187 * Due to we used the "of_property_read_u32" interfaces, when this 1188 * property isn't present, the "video_info" can keep the original 1189 * values and wouldn't be modified. 1190 */ 1191 of_property_read_u32(dp_node, "samsung,color-space", 1192 &video->color_space); 1193 of_property_read_u32(dp_node, "samsung,dynamic-range", 1194 &video->dynamic_range); 1195 of_property_read_u32(dp_node, "samsung,ycbcr-coeff", 1196 &video->ycbcr_coeff); 1197 of_property_read_u32(dp_node, "samsung,color-depth", 1198 &video->color_depth); 1199 if (of_property_read_bool(dp_node, "hsync-active-high")) 1200 video->h_sync_polarity = true; 1201 if (of_property_read_bool(dp_node, "vsync-active-high")) 1202 video->v_sync_polarity = true; 1203 if (of_property_read_bool(dp_node, "interlaced")) 1204 video->interlaced = true; 1205 } 1206 1207 static void analogix_dp_bridge_nop(struct drm_bridge *bridge) 1208 { 1209 /* do nothing */ 1210 } 1211 1212 static const struct drm_bridge_funcs analogix_dp_bridge_funcs = { 1213 .pre_enable = analogix_dp_bridge_pre_enable, 1214 .enable = analogix_dp_bridge_enable, 1215 .disable = analogix_dp_bridge_disable, 1216 .post_disable = analogix_dp_bridge_nop, 1217 .mode_set = analogix_dp_bridge_mode_set, 1218 .attach = analogix_dp_bridge_attach, 1219 }; 1220 1221 static int analogix_dp_create_bridge(struct drm_device *drm_dev, 1222 struct analogix_dp_device *dp) 1223 { 1224 struct drm_bridge *bridge; 1225 int ret; 1226 1227 bridge = devm_kzalloc(drm_dev->dev, sizeof(*bridge), GFP_KERNEL); 1228 if (!bridge) { 1229 DRM_ERROR("failed to allocate for drm bridge\n"); 1230 return -ENOMEM; 1231 } 1232 1233 dp->bridge = bridge; 1234 1235 bridge->driver_private = dp; 1236 bridge->funcs = &analogix_dp_bridge_funcs; 1237 1238 ret = drm_bridge_attach(dp->encoder, bridge, NULL); 1239 if (ret) { 1240 DRM_ERROR("failed to attach drm bridge\n"); 1241 return -EINVAL; 1242 } 1243 1244 return 0; 1245 } 1246 1247 static int analogix_dp_dt_parse_pdata(struct analogix_dp_device *dp) 1248 { 1249 struct device_node *dp_node = dp->dev->of_node; 1250 struct video_info *video_info = &dp->video_info; 1251 1252 switch (dp->plat_data->dev_type) { 1253 case RK3288_DP: 1254 case RK3399_EDP: 1255 /* 1256 * Like Rk3288 DisplayPort TRM indicate that "Main link 1257 * containing 4 physical lanes of 2.7/1.62 Gbps/lane". 1258 */ 1259 video_info->max_link_rate = 0x0A; 1260 video_info->max_lane_count = 0x04; 1261 break; 1262 case EXYNOS_DP: 1263 /* 1264 * NOTE: those property parseing code is used for 1265 * providing backward compatibility for samsung platform. 1266 */ 1267 of_property_read_u32(dp_node, "samsung,link-rate", 1268 &video_info->max_link_rate); 1269 of_property_read_u32(dp_node, "samsung,lane-count", 1270 &video_info->max_lane_count); 1271 break; 1272 } 1273 1274 return 0; 1275 } 1276 1277 static ssize_t analogix_dpaux_transfer(struct drm_dp_aux *aux, 1278 struct drm_dp_aux_msg *msg) 1279 { 1280 struct analogix_dp_device *dp = to_dp(aux); 1281 1282 return analogix_dp_transfer(dp, msg); 1283 } 1284 1285 int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev, 1286 struct analogix_dp_plat_data *plat_data) 1287 { 1288 struct platform_device *pdev = to_platform_device(dev); 1289 struct analogix_dp_device *dp; 1290 struct resource *res; 1291 unsigned int irq_flags; 1292 int ret; 1293 1294 if (!plat_data) { 1295 dev_err(dev, "Invalided input plat_data\n"); 1296 return -EINVAL; 1297 } 1298 1299 dp = devm_kzalloc(dev, sizeof(struct analogix_dp_device), GFP_KERNEL); 1300 if (!dp) 1301 return -ENOMEM; 1302 1303 dev_set_drvdata(dev, dp); 1304 1305 dp->dev = &pdev->dev; 1306 dp->dpms_mode = DRM_MODE_DPMS_OFF; 1307 1308 mutex_init(&dp->panel_lock); 1309 dp->panel_is_modeset = false; 1310 1311 /* 1312 * platform dp driver need containor_of the plat_data to get 1313 * the driver private data, so we need to store the point of 1314 * plat_data, not the context of plat_data. 1315 */ 1316 dp->plat_data = plat_data; 1317 1318 ret = analogix_dp_dt_parse_pdata(dp); 1319 if (ret) 1320 return ret; 1321 1322 dp->phy = devm_phy_get(dp->dev, "dp"); 1323 if (IS_ERR(dp->phy)) { 1324 dev_err(dp->dev, "no DP phy configured\n"); 1325 ret = PTR_ERR(dp->phy); 1326 if (ret) { 1327 /* 1328 * phy itself is not enabled, so we can move forward 1329 * assigning NULL to phy pointer. 1330 */ 1331 if (ret == -ENOSYS || ret == -ENODEV) 1332 dp->phy = NULL; 1333 else 1334 return ret; 1335 } 1336 } 1337 1338 dp->clock = devm_clk_get(&pdev->dev, "dp"); 1339 if (IS_ERR(dp->clock)) { 1340 dev_err(&pdev->dev, "failed to get clock\n"); 1341 return PTR_ERR(dp->clock); 1342 } 1343 1344 clk_prepare_enable(dp->clock); 1345 1346 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1347 1348 dp->reg_base = devm_ioremap_resource(&pdev->dev, res); 1349 if (IS_ERR(dp->reg_base)) 1350 return PTR_ERR(dp->reg_base); 1351 1352 dp->force_hpd = of_property_read_bool(dev->of_node, "force-hpd"); 1353 1354 dp->hpd_gpio = of_get_named_gpio(dev->of_node, "hpd-gpios", 0); 1355 if (!gpio_is_valid(dp->hpd_gpio)) 1356 dp->hpd_gpio = of_get_named_gpio(dev->of_node, 1357 "samsung,hpd-gpio", 0); 1358 1359 if (gpio_is_valid(dp->hpd_gpio)) { 1360 /* 1361 * Set up the hotplug GPIO from the device tree as an interrupt. 1362 * Simply specifying a different interrupt in the device tree 1363 * doesn't work since we handle hotplug rather differently when 1364 * using a GPIO. We also need the actual GPIO specifier so 1365 * that we can get the current state of the GPIO. 1366 */ 1367 ret = devm_gpio_request_one(&pdev->dev, dp->hpd_gpio, GPIOF_IN, 1368 "hpd_gpio"); 1369 if (ret) { 1370 dev_err(&pdev->dev, "failed to get hpd gpio\n"); 1371 return ret; 1372 } 1373 dp->irq = gpio_to_irq(dp->hpd_gpio); 1374 irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING; 1375 } else { 1376 dp->hpd_gpio = -ENODEV; 1377 dp->irq = platform_get_irq(pdev, 0); 1378 irq_flags = 0; 1379 } 1380 1381 if (dp->irq == -ENXIO) { 1382 dev_err(&pdev->dev, "failed to get irq\n"); 1383 return -ENODEV; 1384 } 1385 1386 pm_runtime_enable(dev); 1387 1388 pm_runtime_get_sync(dev); 1389 phy_power_on(dp->phy); 1390 1391 analogix_dp_init_dp(dp); 1392 1393 ret = devm_request_threaded_irq(&pdev->dev, dp->irq, 1394 analogix_dp_hardirq, 1395 analogix_dp_irq_thread, 1396 irq_flags, "analogix-dp", dp); 1397 if (ret) { 1398 dev_err(&pdev->dev, "failed to request irq\n"); 1399 goto err_disable_pm_runtime; 1400 } 1401 disable_irq(dp->irq); 1402 1403 dp->drm_dev = drm_dev; 1404 dp->encoder = dp->plat_data->encoder; 1405 1406 dp->aux.name = "DP-AUX"; 1407 dp->aux.transfer = analogix_dpaux_transfer; 1408 dp->aux.dev = &pdev->dev; 1409 1410 ret = drm_dp_aux_register(&dp->aux); 1411 if (ret) 1412 goto err_disable_pm_runtime; 1413 1414 ret = analogix_dp_create_bridge(drm_dev, dp); 1415 if (ret) { 1416 DRM_ERROR("failed to create bridge (%d)\n", ret); 1417 drm_encoder_cleanup(dp->encoder); 1418 goto err_disable_pm_runtime; 1419 } 1420 1421 phy_power_off(dp->phy); 1422 pm_runtime_put(dev); 1423 1424 return 0; 1425 1426 err_disable_pm_runtime: 1427 1428 phy_power_off(dp->phy); 1429 pm_runtime_put(dev); 1430 pm_runtime_disable(dev); 1431 1432 return ret; 1433 } 1434 EXPORT_SYMBOL_GPL(analogix_dp_bind); 1435 1436 void analogix_dp_unbind(struct device *dev, struct device *master, 1437 void *data) 1438 { 1439 struct analogix_dp_device *dp = dev_get_drvdata(dev); 1440 1441 analogix_dp_bridge_disable(dp->bridge); 1442 1443 if (dp->plat_data->panel) { 1444 if (drm_panel_unprepare(dp->plat_data->panel)) 1445 DRM_ERROR("failed to turnoff the panel\n"); 1446 if (drm_panel_detach(dp->plat_data->panel)) 1447 DRM_ERROR("failed to detach the panel\n"); 1448 } 1449 1450 pm_runtime_disable(dev); 1451 } 1452 EXPORT_SYMBOL_GPL(analogix_dp_unbind); 1453 1454 #ifdef CONFIG_PM 1455 int analogix_dp_suspend(struct device *dev) 1456 { 1457 struct analogix_dp_device *dp = dev_get_drvdata(dev); 1458 1459 clk_disable_unprepare(dp->clock); 1460 1461 if (dp->plat_data->panel) { 1462 if (drm_panel_unprepare(dp->plat_data->panel)) 1463 DRM_ERROR("failed to turnoff the panel\n"); 1464 } 1465 1466 return 0; 1467 } 1468 EXPORT_SYMBOL_GPL(analogix_dp_suspend); 1469 1470 int analogix_dp_resume(struct device *dev) 1471 { 1472 struct analogix_dp_device *dp = dev_get_drvdata(dev); 1473 int ret; 1474 1475 ret = clk_prepare_enable(dp->clock); 1476 if (ret < 0) { 1477 DRM_ERROR("Failed to prepare_enable the clock clk [%d]\n", ret); 1478 return ret; 1479 } 1480 1481 if (dp->plat_data->panel) { 1482 if (drm_panel_prepare(dp->plat_data->panel)) { 1483 DRM_ERROR("failed to setup the panel\n"); 1484 return -EBUSY; 1485 } 1486 } 1487 1488 return 0; 1489 } 1490 EXPORT_SYMBOL_GPL(analogix_dp_resume); 1491 #endif 1492 1493 int analogix_dp_start_crc(struct drm_connector *connector) 1494 { 1495 struct analogix_dp_device *dp = to_dp(connector); 1496 1497 if (!connector->state->crtc) { 1498 DRM_ERROR("Connector %s doesn't currently have a CRTC.\n", 1499 connector->name); 1500 return -EINVAL; 1501 } 1502 1503 return drm_dp_start_crc(&dp->aux, connector->state->crtc); 1504 } 1505 EXPORT_SYMBOL_GPL(analogix_dp_start_crc); 1506 1507 int analogix_dp_stop_crc(struct drm_connector *connector) 1508 { 1509 struct analogix_dp_device *dp = to_dp(connector); 1510 1511 return drm_dp_stop_crc(&dp->aux); 1512 } 1513 EXPORT_SYMBOL_GPL(analogix_dp_stop_crc); 1514 1515 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 1516 MODULE_DESCRIPTION("Analogix DP Core Driver"); 1517 MODULE_LICENSE("GPL v2"); 1518