1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved. 4 */ 5 6 #define pr_fmt(fmt) "[drm-dp] %s: " fmt, __func__ 7 8 #include <linux/types.h> 9 #include <linux/completion.h> 10 #include <linux/delay.h> 11 #include <linux/phy/phy.h> 12 #include <linux/phy/phy-dp.h> 13 #include <linux/pm_opp.h> 14 15 #include <drm/display/drm_dp_helper.h> 16 #include <drm/drm_fixed.h> 17 #include <drm/drm_print.h> 18 19 #include "dp_reg.h" 20 #include "dp_ctrl.h" 21 #include "dp_link.h" 22 23 #define DP_KHZ_TO_HZ 1000 24 #define IDLE_PATTERN_COMPLETION_TIMEOUT_JIFFIES (30 * HZ / 1000) /* 30 ms */ 25 #define PSR_OPERATION_COMPLETION_TIMEOUT_JIFFIES (300 * HZ / 1000) /* 300 ms */ 26 #define WAIT_FOR_VIDEO_READY_TIMEOUT_JIFFIES (HZ / 2) 27 28 #define DP_CTRL_INTR_READY_FOR_VIDEO BIT(0) 29 #define DP_CTRL_INTR_IDLE_PATTERN_SENT BIT(3) 30 31 #define MR_LINK_TRAINING1 0x8 32 #define MR_LINK_SYMBOL_ERM 0x80 33 #define MR_LINK_PRBS7 0x100 34 #define MR_LINK_CUSTOM80 0x200 35 #define MR_LINK_TRAINING4 0x40 36 37 enum { 38 DP_TRAINING_NONE, 39 DP_TRAINING_1, 40 DP_TRAINING_2, 41 }; 42 43 struct dp_tu_calc_input { 44 u64 lclk; /* 162, 270, 540 and 810 */ 45 u64 pclk_khz; /* in KHz */ 46 u64 hactive; /* active h-width */ 47 u64 hporch; /* bp + fp + pulse */ 48 int nlanes; /* no.of.lanes */ 49 int bpp; /* bits */ 50 int pixel_enc; /* 444, 420, 422 */ 51 int dsc_en; /* dsc on/off */ 52 int async_en; /* async mode */ 53 int fec_en; /* fec */ 54 int compress_ratio; /* 2:1 = 200, 3:1 = 300, 3.75:1 = 375 */ 55 int num_of_dsc_slices; /* number of slices per line */ 56 }; 57 58 struct dp_vc_tu_mapping_table { 59 u32 vic; 60 u8 lanes; 61 u8 lrate; /* DP_LINK_RATE -> 162(6), 270(10), 540(20), 810 (30) */ 62 u8 bpp; 63 u8 valid_boundary_link; 64 u16 delay_start_link; 65 bool boundary_moderation_en; 66 u8 valid_lower_boundary_link; 67 u8 upper_boundary_count; 68 u8 lower_boundary_count; 69 u8 tu_size_minus1; 70 }; 71 72 struct dp_ctrl_private { 73 struct dp_ctrl dp_ctrl; 74 struct drm_device *drm_dev; 75 struct device *dev; 76 struct drm_dp_aux *aux; 77 struct dp_panel *panel; 78 struct dp_link *link; 79 struct dp_power *power; 80 struct dp_parser *parser; 81 struct dp_catalog *catalog; 82 83 struct completion idle_comp; 84 struct completion psr_op_comp; 85 struct completion video_comp; 86 }; 87 88 static int dp_aux_link_configure(struct drm_dp_aux *aux, 89 struct dp_link_info *link) 90 { 91 u8 values[2]; 92 int err; 93 94 values[0] = drm_dp_link_rate_to_bw_code(link->rate); 95 values[1] = link->num_lanes; 96 97 if (link->capabilities & DP_LINK_CAP_ENHANCED_FRAMING) 98 values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN; 99 100 err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values)); 101 if (err < 0) 102 return err; 103 104 return 0; 105 } 106 107 void dp_ctrl_push_idle(struct dp_ctrl *dp_ctrl) 108 { 109 struct dp_ctrl_private *ctrl; 110 111 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl); 112 113 reinit_completion(&ctrl->idle_comp); 114 dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_PUSH_IDLE); 115 116 if (!wait_for_completion_timeout(&ctrl->idle_comp, 117 IDLE_PATTERN_COMPLETION_TIMEOUT_JIFFIES)) 118 pr_warn("PUSH_IDLE pattern timedout\n"); 119 120 drm_dbg_dp(ctrl->drm_dev, "mainlink off\n"); 121 } 122 123 static void dp_ctrl_config_ctrl(struct dp_ctrl_private *ctrl) 124 { 125 u32 config = 0, tbd; 126 const u8 *dpcd = ctrl->panel->dpcd; 127 128 /* Default-> LSCLK DIV: 1/4 LCLK */ 129 config |= (2 << DP_CONFIGURATION_CTRL_LSCLK_DIV_SHIFT); 130 131 /* Scrambler reset enable */ 132 if (drm_dp_alternate_scrambler_reset_cap(dpcd)) 133 config |= DP_CONFIGURATION_CTRL_ASSR; 134 135 tbd = dp_link_get_test_bits_depth(ctrl->link, 136 ctrl->panel->dp_mode.bpp); 137 138 config |= tbd << DP_CONFIGURATION_CTRL_BPC_SHIFT; 139 140 /* Num of Lanes */ 141 config |= ((ctrl->link->link_params.num_lanes - 1) 142 << DP_CONFIGURATION_CTRL_NUM_OF_LANES_SHIFT); 143 144 if (drm_dp_enhanced_frame_cap(dpcd)) 145 config |= DP_CONFIGURATION_CTRL_ENHANCED_FRAMING; 146 147 config |= DP_CONFIGURATION_CTRL_P_INTERLACED; /* progressive video */ 148 149 /* sync clock & static Mvid */ 150 config |= DP_CONFIGURATION_CTRL_STATIC_DYNAMIC_CN; 151 config |= DP_CONFIGURATION_CTRL_SYNC_ASYNC_CLK; 152 153 if (ctrl->panel->psr_cap.version) 154 config |= DP_CONFIGURATION_CTRL_SEND_VSC; 155 156 dp_catalog_ctrl_config_ctrl(ctrl->catalog, config); 157 } 158 159 static void dp_ctrl_configure_source_params(struct dp_ctrl_private *ctrl) 160 { 161 u32 cc, tb; 162 163 dp_catalog_ctrl_lane_mapping(ctrl->catalog); 164 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, true); 165 166 dp_ctrl_config_ctrl(ctrl); 167 168 tb = dp_link_get_test_bits_depth(ctrl->link, 169 ctrl->panel->dp_mode.bpp); 170 cc = dp_link_get_colorimetry_config(ctrl->link); 171 dp_catalog_ctrl_config_misc(ctrl->catalog, cc, tb); 172 dp_panel_timing_cfg(ctrl->panel); 173 } 174 175 /* 176 * The structure and few functions present below are IP/Hardware 177 * specific implementation. Most of the implementation will not 178 * have coding comments 179 */ 180 struct tu_algo_data { 181 s64 lclk_fp; 182 s64 pclk_fp; 183 s64 lwidth; 184 s64 lwidth_fp; 185 s64 hbp_relative_to_pclk; 186 s64 hbp_relative_to_pclk_fp; 187 int nlanes; 188 int bpp; 189 int pixelEnc; 190 int dsc_en; 191 int async_en; 192 int bpc; 193 194 uint delay_start_link_extra_pixclk; 195 int extra_buffer_margin; 196 s64 ratio_fp; 197 s64 original_ratio_fp; 198 199 s64 err_fp; 200 s64 n_err_fp; 201 s64 n_n_err_fp; 202 int tu_size; 203 int tu_size_desired; 204 int tu_size_minus1; 205 206 int valid_boundary_link; 207 s64 resulting_valid_fp; 208 s64 total_valid_fp; 209 s64 effective_valid_fp; 210 s64 effective_valid_recorded_fp; 211 int n_tus; 212 int n_tus_per_lane; 213 int paired_tus; 214 int remainder_tus; 215 int remainder_tus_upper; 216 int remainder_tus_lower; 217 int extra_bytes; 218 int filler_size; 219 int delay_start_link; 220 221 int extra_pclk_cycles; 222 int extra_pclk_cycles_in_link_clk; 223 s64 ratio_by_tu_fp; 224 s64 average_valid2_fp; 225 int new_valid_boundary_link; 226 int remainder_symbols_exist; 227 int n_symbols; 228 s64 n_remainder_symbols_per_lane_fp; 229 s64 last_partial_tu_fp; 230 s64 TU_ratio_err_fp; 231 232 int n_tus_incl_last_incomplete_tu; 233 int extra_pclk_cycles_tmp; 234 int extra_pclk_cycles_in_link_clk_tmp; 235 int extra_required_bytes_new_tmp; 236 int filler_size_tmp; 237 int lower_filler_size_tmp; 238 int delay_start_link_tmp; 239 240 bool boundary_moderation_en; 241 int boundary_mod_lower_err; 242 int upper_boundary_count; 243 int lower_boundary_count; 244 int i_upper_boundary_count; 245 int i_lower_boundary_count; 246 int valid_lower_boundary_link; 247 int even_distribution_BF; 248 int even_distribution_legacy; 249 int even_distribution; 250 int min_hblank_violated; 251 s64 delay_start_time_fp; 252 s64 hbp_time_fp; 253 s64 hactive_time_fp; 254 s64 diff_abs_fp; 255 256 s64 ratio; 257 }; 258 259 static int _tu_param_compare(s64 a, s64 b) 260 { 261 u32 a_sign; 262 u32 b_sign; 263 s64 a_temp, b_temp, minus_1; 264 265 if (a == b) 266 return 0; 267 268 minus_1 = drm_fixp_from_fraction(-1, 1); 269 270 a_sign = (a >> 32) & 0x80000000 ? 1 : 0; 271 272 b_sign = (b >> 32) & 0x80000000 ? 1 : 0; 273 274 if (a_sign > b_sign) 275 return 2; 276 else if (b_sign > a_sign) 277 return 1; 278 279 if (!a_sign && !b_sign) { /* positive */ 280 if (a > b) 281 return 1; 282 else 283 return 2; 284 } else { /* negative */ 285 a_temp = drm_fixp_mul(a, minus_1); 286 b_temp = drm_fixp_mul(b, minus_1); 287 288 if (a_temp > b_temp) 289 return 2; 290 else 291 return 1; 292 } 293 } 294 295 static void dp_panel_update_tu_timings(struct dp_tu_calc_input *in, 296 struct tu_algo_data *tu) 297 { 298 int nlanes = in->nlanes; 299 int dsc_num_slices = in->num_of_dsc_slices; 300 int dsc_num_bytes = 0; 301 int numerator; 302 s64 pclk_dsc_fp; 303 s64 dwidth_dsc_fp; 304 s64 hbp_dsc_fp; 305 306 int tot_num_eoc_symbols = 0; 307 int tot_num_hor_bytes = 0; 308 int tot_num_dummy_bytes = 0; 309 int dwidth_dsc_bytes = 0; 310 int eoc_bytes = 0; 311 312 s64 temp1_fp, temp2_fp, temp3_fp; 313 314 tu->lclk_fp = drm_fixp_from_fraction(in->lclk, 1); 315 tu->pclk_fp = drm_fixp_from_fraction(in->pclk_khz, 1000); 316 tu->lwidth = in->hactive; 317 tu->hbp_relative_to_pclk = in->hporch; 318 tu->nlanes = in->nlanes; 319 tu->bpp = in->bpp; 320 tu->pixelEnc = in->pixel_enc; 321 tu->dsc_en = in->dsc_en; 322 tu->async_en = in->async_en; 323 tu->lwidth_fp = drm_fixp_from_fraction(in->hactive, 1); 324 tu->hbp_relative_to_pclk_fp = drm_fixp_from_fraction(in->hporch, 1); 325 326 if (tu->pixelEnc == 420) { 327 temp1_fp = drm_fixp_from_fraction(2, 1); 328 tu->pclk_fp = drm_fixp_div(tu->pclk_fp, temp1_fp); 329 tu->lwidth_fp = drm_fixp_div(tu->lwidth_fp, temp1_fp); 330 tu->hbp_relative_to_pclk_fp = 331 drm_fixp_div(tu->hbp_relative_to_pclk_fp, 2); 332 } 333 334 if (tu->pixelEnc == 422) { 335 switch (tu->bpp) { 336 case 24: 337 tu->bpp = 16; 338 tu->bpc = 8; 339 break; 340 case 30: 341 tu->bpp = 20; 342 tu->bpc = 10; 343 break; 344 default: 345 tu->bpp = 16; 346 tu->bpc = 8; 347 break; 348 } 349 } else { 350 tu->bpc = tu->bpp/3; 351 } 352 353 if (!in->dsc_en) 354 goto fec_check; 355 356 temp1_fp = drm_fixp_from_fraction(in->compress_ratio, 100); 357 temp2_fp = drm_fixp_from_fraction(in->bpp, 1); 358 temp3_fp = drm_fixp_div(temp2_fp, temp1_fp); 359 temp2_fp = drm_fixp_mul(tu->lwidth_fp, temp3_fp); 360 361 temp1_fp = drm_fixp_from_fraction(8, 1); 362 temp3_fp = drm_fixp_div(temp2_fp, temp1_fp); 363 364 numerator = drm_fixp2int(temp3_fp); 365 366 dsc_num_bytes = numerator / dsc_num_slices; 367 eoc_bytes = dsc_num_bytes % nlanes; 368 tot_num_eoc_symbols = nlanes * dsc_num_slices; 369 tot_num_hor_bytes = dsc_num_bytes * dsc_num_slices; 370 tot_num_dummy_bytes = (nlanes - eoc_bytes) * dsc_num_slices; 371 372 if (dsc_num_bytes == 0) 373 pr_info("incorrect no of bytes per slice=%d\n", dsc_num_bytes); 374 375 dwidth_dsc_bytes = (tot_num_hor_bytes + 376 tot_num_eoc_symbols + 377 (eoc_bytes == 0 ? 0 : tot_num_dummy_bytes)); 378 379 dwidth_dsc_fp = drm_fixp_from_fraction(dwidth_dsc_bytes, 3); 380 381 temp2_fp = drm_fixp_mul(tu->pclk_fp, dwidth_dsc_fp); 382 temp1_fp = drm_fixp_div(temp2_fp, tu->lwidth_fp); 383 pclk_dsc_fp = temp1_fp; 384 385 temp1_fp = drm_fixp_div(pclk_dsc_fp, tu->pclk_fp); 386 temp2_fp = drm_fixp_mul(tu->hbp_relative_to_pclk_fp, temp1_fp); 387 hbp_dsc_fp = temp2_fp; 388 389 /* output */ 390 tu->pclk_fp = pclk_dsc_fp; 391 tu->lwidth_fp = dwidth_dsc_fp; 392 tu->hbp_relative_to_pclk_fp = hbp_dsc_fp; 393 394 fec_check: 395 if (in->fec_en) { 396 temp1_fp = drm_fixp_from_fraction(976, 1000); /* 0.976 */ 397 tu->lclk_fp = drm_fixp_mul(tu->lclk_fp, temp1_fp); 398 } 399 } 400 401 static void _tu_valid_boundary_calc(struct tu_algo_data *tu) 402 { 403 s64 temp1_fp, temp2_fp, temp, temp1, temp2; 404 int compare_result_1, compare_result_2, compare_result_3; 405 406 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1); 407 temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp); 408 409 tu->new_valid_boundary_link = drm_fixp2int_ceil(temp2_fp); 410 411 temp = (tu->i_upper_boundary_count * 412 tu->new_valid_boundary_link + 413 tu->i_lower_boundary_count * 414 (tu->new_valid_boundary_link-1)); 415 tu->average_valid2_fp = drm_fixp_from_fraction(temp, 416 (tu->i_upper_boundary_count + 417 tu->i_lower_boundary_count)); 418 419 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8); 420 temp2_fp = tu->lwidth_fp; 421 temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp); 422 temp2_fp = drm_fixp_div(temp1_fp, tu->average_valid2_fp); 423 tu->n_tus = drm_fixp2int(temp2_fp); 424 if ((temp2_fp & 0xFFFFFFFF) > 0xFFFFF000) 425 tu->n_tus += 1; 426 427 temp1_fp = drm_fixp_from_fraction(tu->n_tus, 1); 428 temp2_fp = drm_fixp_mul(temp1_fp, tu->average_valid2_fp); 429 temp1_fp = drm_fixp_from_fraction(tu->n_symbols, 1); 430 temp2_fp = temp1_fp - temp2_fp; 431 temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1); 432 temp2_fp = drm_fixp_div(temp2_fp, temp1_fp); 433 tu->n_remainder_symbols_per_lane_fp = temp2_fp; 434 435 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1); 436 tu->last_partial_tu_fp = 437 drm_fixp_div(tu->n_remainder_symbols_per_lane_fp, 438 temp1_fp); 439 440 if (tu->n_remainder_symbols_per_lane_fp != 0) 441 tu->remainder_symbols_exist = 1; 442 else 443 tu->remainder_symbols_exist = 0; 444 445 temp1_fp = drm_fixp_from_fraction(tu->n_tus, tu->nlanes); 446 tu->n_tus_per_lane = drm_fixp2int(temp1_fp); 447 448 tu->paired_tus = (int)((tu->n_tus_per_lane) / 449 (tu->i_upper_boundary_count + 450 tu->i_lower_boundary_count)); 451 452 tu->remainder_tus = tu->n_tus_per_lane - tu->paired_tus * 453 (tu->i_upper_boundary_count + 454 tu->i_lower_boundary_count); 455 456 if ((tu->remainder_tus - tu->i_upper_boundary_count) > 0) { 457 tu->remainder_tus_upper = tu->i_upper_boundary_count; 458 tu->remainder_tus_lower = tu->remainder_tus - 459 tu->i_upper_boundary_count; 460 } else { 461 tu->remainder_tus_upper = tu->remainder_tus; 462 tu->remainder_tus_lower = 0; 463 } 464 465 temp = tu->paired_tus * (tu->i_upper_boundary_count * 466 tu->new_valid_boundary_link + 467 tu->i_lower_boundary_count * 468 (tu->new_valid_boundary_link - 1)) + 469 (tu->remainder_tus_upper * 470 tu->new_valid_boundary_link) + 471 (tu->remainder_tus_lower * 472 (tu->new_valid_boundary_link - 1)); 473 tu->total_valid_fp = drm_fixp_from_fraction(temp, 1); 474 475 if (tu->remainder_symbols_exist) { 476 temp1_fp = tu->total_valid_fp + 477 tu->n_remainder_symbols_per_lane_fp; 478 temp2_fp = drm_fixp_from_fraction(tu->n_tus_per_lane, 1); 479 temp2_fp = temp2_fp + tu->last_partial_tu_fp; 480 temp1_fp = drm_fixp_div(temp1_fp, temp2_fp); 481 } else { 482 temp2_fp = drm_fixp_from_fraction(tu->n_tus_per_lane, 1); 483 temp1_fp = drm_fixp_div(tu->total_valid_fp, temp2_fp); 484 } 485 tu->effective_valid_fp = temp1_fp; 486 487 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1); 488 temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp); 489 tu->n_n_err_fp = tu->effective_valid_fp - temp2_fp; 490 491 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1); 492 temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp); 493 tu->n_err_fp = tu->average_valid2_fp - temp2_fp; 494 495 tu->even_distribution = tu->n_tus % tu->nlanes == 0 ? 1 : 0; 496 497 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8); 498 temp2_fp = tu->lwidth_fp; 499 temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp); 500 temp2_fp = drm_fixp_div(temp1_fp, tu->average_valid2_fp); 501 502 if (temp2_fp) 503 tu->n_tus_incl_last_incomplete_tu = drm_fixp2int_ceil(temp2_fp); 504 else 505 tu->n_tus_incl_last_incomplete_tu = 0; 506 507 temp1 = 0; 508 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1); 509 temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp); 510 temp1_fp = tu->average_valid2_fp - temp2_fp; 511 temp2_fp = drm_fixp_from_fraction(tu->n_tus_incl_last_incomplete_tu, 1); 512 temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp); 513 514 if (temp1_fp) 515 temp1 = drm_fixp2int_ceil(temp1_fp); 516 517 temp = tu->i_upper_boundary_count * tu->nlanes; 518 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1); 519 temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp); 520 temp1_fp = drm_fixp_from_fraction(tu->new_valid_boundary_link, 1); 521 temp2_fp = temp1_fp - temp2_fp; 522 temp1_fp = drm_fixp_from_fraction(temp, 1); 523 temp2_fp = drm_fixp_mul(temp1_fp, temp2_fp); 524 525 if (temp2_fp) 526 temp2 = drm_fixp2int_ceil(temp2_fp); 527 else 528 temp2 = 0; 529 tu->extra_required_bytes_new_tmp = (int)(temp1 + temp2); 530 531 temp1_fp = drm_fixp_from_fraction(8, tu->bpp); 532 temp2_fp = drm_fixp_from_fraction( 533 tu->extra_required_bytes_new_tmp, 1); 534 temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp); 535 536 if (temp1_fp) 537 tu->extra_pclk_cycles_tmp = drm_fixp2int_ceil(temp1_fp); 538 else 539 tu->extra_pclk_cycles_tmp = 0; 540 541 temp1_fp = drm_fixp_from_fraction(tu->extra_pclk_cycles_tmp, 1); 542 temp2_fp = drm_fixp_div(tu->lclk_fp, tu->pclk_fp); 543 temp1_fp = drm_fixp_mul(temp1_fp, temp2_fp); 544 545 if (temp1_fp) 546 tu->extra_pclk_cycles_in_link_clk_tmp = 547 drm_fixp2int_ceil(temp1_fp); 548 else 549 tu->extra_pclk_cycles_in_link_clk_tmp = 0; 550 551 tu->filler_size_tmp = tu->tu_size - tu->new_valid_boundary_link; 552 553 tu->lower_filler_size_tmp = tu->filler_size_tmp + 1; 554 555 tu->delay_start_link_tmp = tu->extra_pclk_cycles_in_link_clk_tmp + 556 tu->lower_filler_size_tmp + 557 tu->extra_buffer_margin; 558 559 temp1_fp = drm_fixp_from_fraction(tu->delay_start_link_tmp, 1); 560 tu->delay_start_time_fp = drm_fixp_div(temp1_fp, tu->lclk_fp); 561 562 compare_result_1 = _tu_param_compare(tu->n_n_err_fp, tu->diff_abs_fp); 563 if (compare_result_1 == 2) 564 compare_result_1 = 1; 565 else 566 compare_result_1 = 0; 567 568 compare_result_2 = _tu_param_compare(tu->n_n_err_fp, tu->err_fp); 569 if (compare_result_2 == 2) 570 compare_result_2 = 1; 571 else 572 compare_result_2 = 0; 573 574 compare_result_3 = _tu_param_compare(tu->hbp_time_fp, 575 tu->delay_start_time_fp); 576 if (compare_result_3 == 2) 577 compare_result_3 = 0; 578 else 579 compare_result_3 = 1; 580 581 if (((tu->even_distribution == 1) || 582 ((tu->even_distribution_BF == 0) && 583 (tu->even_distribution_legacy == 0))) && 584 tu->n_err_fp >= 0 && tu->n_n_err_fp >= 0 && 585 compare_result_2 && 586 (compare_result_1 || (tu->min_hblank_violated == 1)) && 587 (tu->new_valid_boundary_link - 1) > 0 && 588 compare_result_3 && 589 (tu->delay_start_link_tmp <= 1023)) { 590 tu->upper_boundary_count = tu->i_upper_boundary_count; 591 tu->lower_boundary_count = tu->i_lower_boundary_count; 592 tu->err_fp = tu->n_n_err_fp; 593 tu->boundary_moderation_en = true; 594 tu->tu_size_desired = tu->tu_size; 595 tu->valid_boundary_link = tu->new_valid_boundary_link; 596 tu->effective_valid_recorded_fp = tu->effective_valid_fp; 597 tu->even_distribution_BF = 1; 598 tu->delay_start_link = tu->delay_start_link_tmp; 599 } else if (tu->boundary_mod_lower_err == 0) { 600 compare_result_1 = _tu_param_compare(tu->n_n_err_fp, 601 tu->diff_abs_fp); 602 if (compare_result_1 == 2) 603 tu->boundary_mod_lower_err = 1; 604 } 605 } 606 607 static void _dp_ctrl_calc_tu(struct dp_ctrl_private *ctrl, 608 struct dp_tu_calc_input *in, 609 struct dp_vc_tu_mapping_table *tu_table) 610 { 611 struct tu_algo_data *tu; 612 int compare_result_1, compare_result_2; 613 u64 temp = 0; 614 s64 temp_fp = 0, temp1_fp = 0, temp2_fp = 0; 615 616 s64 LCLK_FAST_SKEW_fp = drm_fixp_from_fraction(6, 10000); /* 0.0006 */ 617 s64 const_p49_fp = drm_fixp_from_fraction(49, 100); /* 0.49 */ 618 s64 const_p56_fp = drm_fixp_from_fraction(56, 100); /* 0.56 */ 619 s64 RATIO_SCALE_fp = drm_fixp_from_fraction(1001, 1000); 620 621 u8 DP_BRUTE_FORCE = 1; 622 s64 BRUTE_FORCE_THRESHOLD_fp = drm_fixp_from_fraction(1, 10); /* 0.1 */ 623 uint EXTRA_PIXCLK_CYCLE_DELAY = 4; 624 uint HBLANK_MARGIN = 4; 625 626 tu = kzalloc(sizeof(*tu), GFP_KERNEL); 627 if (!tu) 628 return; 629 630 dp_panel_update_tu_timings(in, tu); 631 632 tu->err_fp = drm_fixp_from_fraction(1000, 1); /* 1000 */ 633 634 temp1_fp = drm_fixp_from_fraction(4, 1); 635 temp2_fp = drm_fixp_mul(temp1_fp, tu->lclk_fp); 636 temp_fp = drm_fixp_div(temp2_fp, tu->pclk_fp); 637 tu->extra_buffer_margin = drm_fixp2int_ceil(temp_fp); 638 639 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8); 640 temp2_fp = drm_fixp_mul(tu->pclk_fp, temp1_fp); 641 temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1); 642 temp2_fp = drm_fixp_div(temp2_fp, temp1_fp); 643 tu->ratio_fp = drm_fixp_div(temp2_fp, tu->lclk_fp); 644 645 tu->original_ratio_fp = tu->ratio_fp; 646 tu->boundary_moderation_en = false; 647 tu->upper_boundary_count = 0; 648 tu->lower_boundary_count = 0; 649 tu->i_upper_boundary_count = 0; 650 tu->i_lower_boundary_count = 0; 651 tu->valid_lower_boundary_link = 0; 652 tu->even_distribution_BF = 0; 653 tu->even_distribution_legacy = 0; 654 tu->even_distribution = 0; 655 tu->delay_start_time_fp = 0; 656 657 tu->err_fp = drm_fixp_from_fraction(1000, 1); 658 tu->n_err_fp = 0; 659 tu->n_n_err_fp = 0; 660 661 tu->ratio = drm_fixp2int(tu->ratio_fp); 662 temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1); 663 div64_u64_rem(tu->lwidth_fp, temp1_fp, &temp2_fp); 664 if (temp2_fp != 0 && 665 !tu->ratio && tu->dsc_en == 0) { 666 tu->ratio_fp = drm_fixp_mul(tu->ratio_fp, RATIO_SCALE_fp); 667 tu->ratio = drm_fixp2int(tu->ratio_fp); 668 if (tu->ratio) 669 tu->ratio_fp = drm_fixp_from_fraction(1, 1); 670 } 671 672 if (tu->ratio > 1) 673 tu->ratio = 1; 674 675 if (tu->ratio == 1) 676 goto tu_size_calc; 677 678 compare_result_1 = _tu_param_compare(tu->ratio_fp, const_p49_fp); 679 if (!compare_result_1 || compare_result_1 == 1) 680 compare_result_1 = 1; 681 else 682 compare_result_1 = 0; 683 684 compare_result_2 = _tu_param_compare(tu->ratio_fp, const_p56_fp); 685 if (!compare_result_2 || compare_result_2 == 2) 686 compare_result_2 = 1; 687 else 688 compare_result_2 = 0; 689 690 if (tu->dsc_en && compare_result_1 && compare_result_2) { 691 HBLANK_MARGIN += 4; 692 drm_dbg_dp(ctrl->drm_dev, 693 "increase HBLANK_MARGIN to %d\n", HBLANK_MARGIN); 694 } 695 696 tu_size_calc: 697 for (tu->tu_size = 32; tu->tu_size <= 64; tu->tu_size++) { 698 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1); 699 temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp); 700 temp = drm_fixp2int_ceil(temp2_fp); 701 temp1_fp = drm_fixp_from_fraction(temp, 1); 702 tu->n_err_fp = temp1_fp - temp2_fp; 703 704 if (tu->n_err_fp < tu->err_fp) { 705 tu->err_fp = tu->n_err_fp; 706 tu->tu_size_desired = tu->tu_size; 707 } 708 } 709 710 tu->tu_size_minus1 = tu->tu_size_desired - 1; 711 712 temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1); 713 temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp); 714 tu->valid_boundary_link = drm_fixp2int_ceil(temp2_fp); 715 716 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8); 717 temp2_fp = tu->lwidth_fp; 718 temp2_fp = drm_fixp_mul(temp2_fp, temp1_fp); 719 720 temp1_fp = drm_fixp_from_fraction(tu->valid_boundary_link, 1); 721 temp2_fp = drm_fixp_div(temp2_fp, temp1_fp); 722 tu->n_tus = drm_fixp2int(temp2_fp); 723 if ((temp2_fp & 0xFFFFFFFF) > 0xFFFFF000) 724 tu->n_tus += 1; 725 726 tu->even_distribution_legacy = tu->n_tus % tu->nlanes == 0 ? 1 : 0; 727 728 drm_dbg_dp(ctrl->drm_dev, 729 "n_sym = %d, num_of_tus = %d\n", 730 tu->valid_boundary_link, tu->n_tus); 731 732 temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1); 733 temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp); 734 temp1_fp = drm_fixp_from_fraction(tu->valid_boundary_link, 1); 735 temp2_fp = temp1_fp - temp2_fp; 736 temp1_fp = drm_fixp_from_fraction(tu->n_tus + 1, 1); 737 temp2_fp = drm_fixp_mul(temp1_fp, temp2_fp); 738 739 temp = drm_fixp2int(temp2_fp); 740 if (temp && temp2_fp) 741 tu->extra_bytes = drm_fixp2int_ceil(temp2_fp); 742 else 743 tu->extra_bytes = 0; 744 745 temp1_fp = drm_fixp_from_fraction(tu->extra_bytes, 1); 746 temp2_fp = drm_fixp_from_fraction(8, tu->bpp); 747 temp1_fp = drm_fixp_mul(temp1_fp, temp2_fp); 748 749 if (temp && temp1_fp) 750 tu->extra_pclk_cycles = drm_fixp2int_ceil(temp1_fp); 751 else 752 tu->extra_pclk_cycles = drm_fixp2int(temp1_fp); 753 754 temp1_fp = drm_fixp_div(tu->lclk_fp, tu->pclk_fp); 755 temp2_fp = drm_fixp_from_fraction(tu->extra_pclk_cycles, 1); 756 temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp); 757 758 if (temp1_fp) 759 tu->extra_pclk_cycles_in_link_clk = drm_fixp2int_ceil(temp1_fp); 760 else 761 tu->extra_pclk_cycles_in_link_clk = drm_fixp2int(temp1_fp); 762 763 tu->filler_size = tu->tu_size_desired - tu->valid_boundary_link; 764 765 temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1); 766 tu->ratio_by_tu_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp); 767 768 tu->delay_start_link = tu->extra_pclk_cycles_in_link_clk + 769 tu->filler_size + tu->extra_buffer_margin; 770 771 tu->resulting_valid_fp = 772 drm_fixp_from_fraction(tu->valid_boundary_link, 1); 773 774 temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1); 775 temp2_fp = drm_fixp_div(tu->resulting_valid_fp, temp1_fp); 776 tu->TU_ratio_err_fp = temp2_fp - tu->original_ratio_fp; 777 778 temp1_fp = drm_fixp_from_fraction(HBLANK_MARGIN, 1); 779 temp1_fp = tu->hbp_relative_to_pclk_fp - temp1_fp; 780 tu->hbp_time_fp = drm_fixp_div(temp1_fp, tu->pclk_fp); 781 782 temp1_fp = drm_fixp_from_fraction(tu->delay_start_link, 1); 783 tu->delay_start_time_fp = drm_fixp_div(temp1_fp, tu->lclk_fp); 784 785 compare_result_1 = _tu_param_compare(tu->hbp_time_fp, 786 tu->delay_start_time_fp); 787 if (compare_result_1 == 2) /* if (hbp_time_fp < delay_start_time_fp) */ 788 tu->min_hblank_violated = 1; 789 790 tu->hactive_time_fp = drm_fixp_div(tu->lwidth_fp, tu->pclk_fp); 791 792 compare_result_2 = _tu_param_compare(tu->hactive_time_fp, 793 tu->delay_start_time_fp); 794 if (compare_result_2 == 2) 795 tu->min_hblank_violated = 1; 796 797 tu->delay_start_time_fp = 0; 798 799 /* brute force */ 800 801 tu->delay_start_link_extra_pixclk = EXTRA_PIXCLK_CYCLE_DELAY; 802 tu->diff_abs_fp = tu->resulting_valid_fp - tu->ratio_by_tu_fp; 803 804 temp = drm_fixp2int(tu->diff_abs_fp); 805 if (!temp && tu->diff_abs_fp <= 0xffff) 806 tu->diff_abs_fp = 0; 807 808 /* if(diff_abs < 0) diff_abs *= -1 */ 809 if (tu->diff_abs_fp < 0) 810 tu->diff_abs_fp = drm_fixp_mul(tu->diff_abs_fp, -1); 811 812 tu->boundary_mod_lower_err = 0; 813 if ((tu->diff_abs_fp != 0 && 814 ((tu->diff_abs_fp > BRUTE_FORCE_THRESHOLD_fp) || 815 (tu->even_distribution_legacy == 0) || 816 (DP_BRUTE_FORCE == 1))) || 817 (tu->min_hblank_violated == 1)) { 818 do { 819 tu->err_fp = drm_fixp_from_fraction(1000, 1); 820 821 temp1_fp = drm_fixp_div(tu->lclk_fp, tu->pclk_fp); 822 temp2_fp = drm_fixp_from_fraction( 823 tu->delay_start_link_extra_pixclk, 1); 824 temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp); 825 826 if (temp1_fp) 827 tu->extra_buffer_margin = 828 drm_fixp2int_ceil(temp1_fp); 829 else 830 tu->extra_buffer_margin = 0; 831 832 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8); 833 temp1_fp = drm_fixp_mul(tu->lwidth_fp, temp1_fp); 834 835 if (temp1_fp) 836 tu->n_symbols = drm_fixp2int_ceil(temp1_fp); 837 else 838 tu->n_symbols = 0; 839 840 for (tu->tu_size = 32; tu->tu_size <= 64; tu->tu_size++) { 841 for (tu->i_upper_boundary_count = 1; 842 tu->i_upper_boundary_count <= 15; 843 tu->i_upper_boundary_count++) { 844 for (tu->i_lower_boundary_count = 1; 845 tu->i_lower_boundary_count <= 15; 846 tu->i_lower_boundary_count++) { 847 _tu_valid_boundary_calc(tu); 848 } 849 } 850 } 851 tu->delay_start_link_extra_pixclk--; 852 } while (tu->boundary_moderation_en != true && 853 tu->boundary_mod_lower_err == 1 && 854 tu->delay_start_link_extra_pixclk != 0); 855 856 if (tu->boundary_moderation_en == true) { 857 temp1_fp = drm_fixp_from_fraction( 858 (tu->upper_boundary_count * 859 tu->valid_boundary_link + 860 tu->lower_boundary_count * 861 (tu->valid_boundary_link - 1)), 1); 862 temp2_fp = drm_fixp_from_fraction( 863 (tu->upper_boundary_count + 864 tu->lower_boundary_count), 1); 865 tu->resulting_valid_fp = 866 drm_fixp_div(temp1_fp, temp2_fp); 867 868 temp1_fp = drm_fixp_from_fraction( 869 tu->tu_size_desired, 1); 870 tu->ratio_by_tu_fp = 871 drm_fixp_mul(tu->original_ratio_fp, temp1_fp); 872 873 tu->valid_lower_boundary_link = 874 tu->valid_boundary_link - 1; 875 876 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8); 877 temp1_fp = drm_fixp_mul(tu->lwidth_fp, temp1_fp); 878 temp2_fp = drm_fixp_div(temp1_fp, 879 tu->resulting_valid_fp); 880 tu->n_tus = drm_fixp2int(temp2_fp); 881 882 tu->tu_size_minus1 = tu->tu_size_desired - 1; 883 tu->even_distribution_BF = 1; 884 885 temp1_fp = 886 drm_fixp_from_fraction(tu->tu_size_desired, 1); 887 temp2_fp = 888 drm_fixp_div(tu->resulting_valid_fp, temp1_fp); 889 tu->TU_ratio_err_fp = temp2_fp - tu->original_ratio_fp; 890 } 891 } 892 893 temp2_fp = drm_fixp_mul(LCLK_FAST_SKEW_fp, tu->lwidth_fp); 894 895 if (temp2_fp) 896 temp = drm_fixp2int_ceil(temp2_fp); 897 else 898 temp = 0; 899 900 temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1); 901 temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp); 902 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8); 903 temp2_fp = drm_fixp_div(temp1_fp, temp2_fp); 904 temp1_fp = drm_fixp_from_fraction(temp, 1); 905 temp2_fp = drm_fixp_mul(temp1_fp, temp2_fp); 906 temp = drm_fixp2int(temp2_fp); 907 908 if (tu->async_en) 909 tu->delay_start_link += (int)temp; 910 911 temp1_fp = drm_fixp_from_fraction(tu->delay_start_link, 1); 912 tu->delay_start_time_fp = drm_fixp_div(temp1_fp, tu->lclk_fp); 913 914 /* OUTPUTS */ 915 tu_table->valid_boundary_link = tu->valid_boundary_link; 916 tu_table->delay_start_link = tu->delay_start_link; 917 tu_table->boundary_moderation_en = tu->boundary_moderation_en; 918 tu_table->valid_lower_boundary_link = tu->valid_lower_boundary_link; 919 tu_table->upper_boundary_count = tu->upper_boundary_count; 920 tu_table->lower_boundary_count = tu->lower_boundary_count; 921 tu_table->tu_size_minus1 = tu->tu_size_minus1; 922 923 drm_dbg_dp(ctrl->drm_dev, "TU: valid_boundary_link: %d\n", 924 tu_table->valid_boundary_link); 925 drm_dbg_dp(ctrl->drm_dev, "TU: delay_start_link: %d\n", 926 tu_table->delay_start_link); 927 drm_dbg_dp(ctrl->drm_dev, "TU: boundary_moderation_en: %d\n", 928 tu_table->boundary_moderation_en); 929 drm_dbg_dp(ctrl->drm_dev, "TU: valid_lower_boundary_link: %d\n", 930 tu_table->valid_lower_boundary_link); 931 drm_dbg_dp(ctrl->drm_dev, "TU: upper_boundary_count: %d\n", 932 tu_table->upper_boundary_count); 933 drm_dbg_dp(ctrl->drm_dev, "TU: lower_boundary_count: %d\n", 934 tu_table->lower_boundary_count); 935 drm_dbg_dp(ctrl->drm_dev, "TU: tu_size_minus1: %d\n", 936 tu_table->tu_size_minus1); 937 938 kfree(tu); 939 } 940 941 static void dp_ctrl_calc_tu_parameters(struct dp_ctrl_private *ctrl, 942 struct dp_vc_tu_mapping_table *tu_table) 943 { 944 struct dp_tu_calc_input in; 945 struct drm_display_mode *drm_mode; 946 947 drm_mode = &ctrl->panel->dp_mode.drm_mode; 948 949 in.lclk = ctrl->link->link_params.rate / 1000; 950 in.pclk_khz = drm_mode->clock; 951 in.hactive = drm_mode->hdisplay; 952 in.hporch = drm_mode->htotal - drm_mode->hdisplay; 953 in.nlanes = ctrl->link->link_params.num_lanes; 954 in.bpp = ctrl->panel->dp_mode.bpp; 955 in.pixel_enc = 444; 956 in.dsc_en = 0; 957 in.async_en = 0; 958 in.fec_en = 0; 959 in.num_of_dsc_slices = 0; 960 in.compress_ratio = 100; 961 962 _dp_ctrl_calc_tu(ctrl, &in, tu_table); 963 } 964 965 static void dp_ctrl_setup_tr_unit(struct dp_ctrl_private *ctrl) 966 { 967 u32 dp_tu = 0x0; 968 u32 valid_boundary = 0x0; 969 u32 valid_boundary2 = 0x0; 970 struct dp_vc_tu_mapping_table tu_calc_table; 971 972 dp_ctrl_calc_tu_parameters(ctrl, &tu_calc_table); 973 974 dp_tu |= tu_calc_table.tu_size_minus1; 975 valid_boundary |= tu_calc_table.valid_boundary_link; 976 valid_boundary |= (tu_calc_table.delay_start_link << 16); 977 978 valid_boundary2 |= (tu_calc_table.valid_lower_boundary_link << 1); 979 valid_boundary2 |= (tu_calc_table.upper_boundary_count << 16); 980 valid_boundary2 |= (tu_calc_table.lower_boundary_count << 20); 981 982 if (tu_calc_table.boundary_moderation_en) 983 valid_boundary2 |= BIT(0); 984 985 pr_debug("dp_tu=0x%x, valid_boundary=0x%x, valid_boundary2=0x%x\n", 986 dp_tu, valid_boundary, valid_boundary2); 987 988 dp_catalog_ctrl_update_transfer_unit(ctrl->catalog, 989 dp_tu, valid_boundary, valid_boundary2); 990 } 991 992 static int dp_ctrl_wait4video_ready(struct dp_ctrl_private *ctrl) 993 { 994 int ret = 0; 995 996 if (!wait_for_completion_timeout(&ctrl->video_comp, 997 WAIT_FOR_VIDEO_READY_TIMEOUT_JIFFIES)) { 998 DRM_ERROR("wait4video timedout\n"); 999 ret = -ETIMEDOUT; 1000 } 1001 return ret; 1002 } 1003 1004 static int dp_ctrl_update_vx_px(struct dp_ctrl_private *ctrl) 1005 { 1006 struct dp_link *link = ctrl->link; 1007 int ret = 0, lane, lane_cnt; 1008 u8 buf[4]; 1009 u32 max_level_reached = 0; 1010 u32 voltage_swing_level = link->phy_params.v_level; 1011 u32 pre_emphasis_level = link->phy_params.p_level; 1012 1013 drm_dbg_dp(ctrl->drm_dev, 1014 "voltage level: %d emphasis level: %d\n", 1015 voltage_swing_level, pre_emphasis_level); 1016 ret = dp_catalog_ctrl_update_vx_px(ctrl->catalog, 1017 voltage_swing_level, pre_emphasis_level); 1018 1019 if (ret) 1020 return ret; 1021 1022 if (voltage_swing_level >= DP_TRAIN_LEVEL_MAX) { 1023 drm_dbg_dp(ctrl->drm_dev, 1024 "max. voltage swing level reached %d\n", 1025 voltage_swing_level); 1026 max_level_reached |= DP_TRAIN_MAX_SWING_REACHED; 1027 } 1028 1029 if (pre_emphasis_level >= DP_TRAIN_LEVEL_MAX) { 1030 drm_dbg_dp(ctrl->drm_dev, 1031 "max. pre-emphasis level reached %d\n", 1032 pre_emphasis_level); 1033 max_level_reached |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; 1034 } 1035 1036 pre_emphasis_level <<= DP_TRAIN_PRE_EMPHASIS_SHIFT; 1037 1038 lane_cnt = ctrl->link->link_params.num_lanes; 1039 for (lane = 0; lane < lane_cnt; lane++) 1040 buf[lane] = voltage_swing_level | pre_emphasis_level 1041 | max_level_reached; 1042 1043 drm_dbg_dp(ctrl->drm_dev, "sink: p|v=0x%x\n", 1044 voltage_swing_level | pre_emphasis_level); 1045 ret = drm_dp_dpcd_write(ctrl->aux, DP_TRAINING_LANE0_SET, 1046 buf, lane_cnt); 1047 if (ret == lane_cnt) 1048 ret = 0; 1049 1050 return ret; 1051 } 1052 1053 static bool dp_ctrl_train_pattern_set(struct dp_ctrl_private *ctrl, 1054 u8 pattern) 1055 { 1056 u8 buf; 1057 int ret = 0; 1058 1059 drm_dbg_dp(ctrl->drm_dev, "sink: pattern=%x\n", pattern); 1060 1061 buf = pattern; 1062 1063 if (pattern && pattern != DP_TRAINING_PATTERN_4) 1064 buf |= DP_LINK_SCRAMBLING_DISABLE; 1065 1066 ret = drm_dp_dpcd_writeb(ctrl->aux, DP_TRAINING_PATTERN_SET, buf); 1067 return ret == 1; 1068 } 1069 1070 static int dp_ctrl_read_link_status(struct dp_ctrl_private *ctrl, 1071 u8 *link_status) 1072 { 1073 int ret = 0, len; 1074 1075 len = drm_dp_dpcd_read_link_status(ctrl->aux, link_status); 1076 if (len != DP_LINK_STATUS_SIZE) { 1077 DRM_ERROR("DP link status read failed, err: %d\n", len); 1078 ret = -EINVAL; 1079 } 1080 1081 return ret; 1082 } 1083 1084 static int dp_ctrl_link_train_1(struct dp_ctrl_private *ctrl, 1085 int *training_step) 1086 { 1087 int tries, old_v_level, ret = 0; 1088 u8 link_status[DP_LINK_STATUS_SIZE]; 1089 int const maximum_retries = 4; 1090 1091 dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0); 1092 1093 *training_step = DP_TRAINING_1; 1094 1095 ret = dp_catalog_ctrl_set_pattern_state_bit(ctrl->catalog, 1); 1096 if (ret) 1097 return ret; 1098 dp_ctrl_train_pattern_set(ctrl, DP_TRAINING_PATTERN_1 | 1099 DP_LINK_SCRAMBLING_DISABLE); 1100 1101 ret = dp_ctrl_update_vx_px(ctrl); 1102 if (ret) 1103 return ret; 1104 1105 tries = 0; 1106 old_v_level = ctrl->link->phy_params.v_level; 1107 for (tries = 0; tries < maximum_retries; tries++) { 1108 drm_dp_link_train_clock_recovery_delay(ctrl->aux, ctrl->panel->dpcd); 1109 1110 ret = dp_ctrl_read_link_status(ctrl, link_status); 1111 if (ret) 1112 return ret; 1113 1114 if (drm_dp_clock_recovery_ok(link_status, 1115 ctrl->link->link_params.num_lanes)) { 1116 return 0; 1117 } 1118 1119 if (ctrl->link->phy_params.v_level >= 1120 DP_TRAIN_LEVEL_MAX) { 1121 DRM_ERROR_RATELIMITED("max v_level reached\n"); 1122 return -EAGAIN; 1123 } 1124 1125 if (old_v_level != ctrl->link->phy_params.v_level) { 1126 tries = 0; 1127 old_v_level = ctrl->link->phy_params.v_level; 1128 } 1129 1130 dp_link_adjust_levels(ctrl->link, link_status); 1131 ret = dp_ctrl_update_vx_px(ctrl); 1132 if (ret) 1133 return ret; 1134 } 1135 1136 DRM_ERROR("max tries reached\n"); 1137 return -ETIMEDOUT; 1138 } 1139 1140 static int dp_ctrl_link_rate_down_shift(struct dp_ctrl_private *ctrl) 1141 { 1142 int ret = 0; 1143 1144 switch (ctrl->link->link_params.rate) { 1145 case 810000: 1146 ctrl->link->link_params.rate = 540000; 1147 break; 1148 case 540000: 1149 ctrl->link->link_params.rate = 270000; 1150 break; 1151 case 270000: 1152 ctrl->link->link_params.rate = 162000; 1153 break; 1154 case 162000: 1155 default: 1156 ret = -EINVAL; 1157 break; 1158 } 1159 1160 if (!ret) { 1161 drm_dbg_dp(ctrl->drm_dev, "new rate=0x%x\n", 1162 ctrl->link->link_params.rate); 1163 } 1164 1165 return ret; 1166 } 1167 1168 static int dp_ctrl_link_lane_down_shift(struct dp_ctrl_private *ctrl) 1169 { 1170 1171 if (ctrl->link->link_params.num_lanes == 1) 1172 return -1; 1173 1174 ctrl->link->link_params.num_lanes /= 2; 1175 ctrl->link->link_params.rate = ctrl->panel->link_info.rate; 1176 1177 ctrl->link->phy_params.p_level = 0; 1178 ctrl->link->phy_params.v_level = 0; 1179 1180 return 0; 1181 } 1182 1183 static void dp_ctrl_clear_training_pattern(struct dp_ctrl_private *ctrl) 1184 { 1185 dp_ctrl_train_pattern_set(ctrl, DP_TRAINING_PATTERN_DISABLE); 1186 drm_dp_link_train_channel_eq_delay(ctrl->aux, ctrl->panel->dpcd); 1187 } 1188 1189 static int dp_ctrl_link_train_2(struct dp_ctrl_private *ctrl, 1190 int *training_step) 1191 { 1192 int tries = 0, ret = 0; 1193 u8 pattern; 1194 u32 state_ctrl_bit; 1195 int const maximum_retries = 5; 1196 u8 link_status[DP_LINK_STATUS_SIZE]; 1197 1198 dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0); 1199 1200 *training_step = DP_TRAINING_2; 1201 1202 if (drm_dp_tps4_supported(ctrl->panel->dpcd)) { 1203 pattern = DP_TRAINING_PATTERN_4; 1204 state_ctrl_bit = 4; 1205 } else if (drm_dp_tps3_supported(ctrl->panel->dpcd)) { 1206 pattern = DP_TRAINING_PATTERN_3; 1207 state_ctrl_bit = 3; 1208 } else { 1209 pattern = DP_TRAINING_PATTERN_2; 1210 state_ctrl_bit = 2; 1211 } 1212 1213 ret = dp_catalog_ctrl_set_pattern_state_bit(ctrl->catalog, state_ctrl_bit); 1214 if (ret) 1215 return ret; 1216 1217 dp_ctrl_train_pattern_set(ctrl, pattern); 1218 1219 for (tries = 0; tries <= maximum_retries; tries++) { 1220 drm_dp_link_train_channel_eq_delay(ctrl->aux, ctrl->panel->dpcd); 1221 1222 ret = dp_ctrl_read_link_status(ctrl, link_status); 1223 if (ret) 1224 return ret; 1225 1226 if (drm_dp_channel_eq_ok(link_status, 1227 ctrl->link->link_params.num_lanes)) { 1228 return 0; 1229 } 1230 1231 dp_link_adjust_levels(ctrl->link, link_status); 1232 ret = dp_ctrl_update_vx_px(ctrl); 1233 if (ret) 1234 return ret; 1235 1236 } 1237 1238 return -ETIMEDOUT; 1239 } 1240 1241 static int dp_ctrl_link_train(struct dp_ctrl_private *ctrl, 1242 int *training_step) 1243 { 1244 int ret = 0; 1245 const u8 *dpcd = ctrl->panel->dpcd; 1246 u8 encoding[] = { 0, DP_SET_ANSI_8B10B }; 1247 u8 assr; 1248 struct dp_link_info link_info = {0}; 1249 1250 dp_ctrl_config_ctrl(ctrl); 1251 1252 link_info.num_lanes = ctrl->link->link_params.num_lanes; 1253 link_info.rate = ctrl->link->link_params.rate; 1254 link_info.capabilities = DP_LINK_CAP_ENHANCED_FRAMING; 1255 1256 dp_link_reset_phy_params_vx_px(ctrl->link); 1257 1258 dp_aux_link_configure(ctrl->aux, &link_info); 1259 1260 if (drm_dp_max_downspread(dpcd)) 1261 encoding[0] |= DP_SPREAD_AMP_0_5; 1262 1263 /* config DOWNSPREAD_CTRL and MAIN_LINK_CHANNEL_CODING_SET */ 1264 drm_dp_dpcd_write(ctrl->aux, DP_DOWNSPREAD_CTRL, encoding, 2); 1265 1266 if (drm_dp_alternate_scrambler_reset_cap(dpcd)) { 1267 assr = DP_ALTERNATE_SCRAMBLER_RESET_ENABLE; 1268 drm_dp_dpcd_write(ctrl->aux, DP_EDP_CONFIGURATION_SET, 1269 &assr, 1); 1270 } 1271 1272 ret = dp_ctrl_link_train_1(ctrl, training_step); 1273 if (ret) { 1274 DRM_ERROR("link training #1 failed. ret=%d\n", ret); 1275 goto end; 1276 } 1277 1278 /* print success info as this is a result of user initiated action */ 1279 drm_dbg_dp(ctrl->drm_dev, "link training #1 successful\n"); 1280 1281 ret = dp_ctrl_link_train_2(ctrl, training_step); 1282 if (ret) { 1283 DRM_ERROR("link training #2 failed. ret=%d\n", ret); 1284 goto end; 1285 } 1286 1287 /* print success info as this is a result of user initiated action */ 1288 drm_dbg_dp(ctrl->drm_dev, "link training #2 successful\n"); 1289 1290 end: 1291 dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0); 1292 1293 return ret; 1294 } 1295 1296 static int dp_ctrl_setup_main_link(struct dp_ctrl_private *ctrl, 1297 int *training_step) 1298 { 1299 int ret = 0; 1300 1301 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, true); 1302 1303 if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) 1304 return ret; 1305 1306 /* 1307 * As part of previous calls, DP controller state might have 1308 * transitioned to PUSH_IDLE. In order to start transmitting 1309 * a link training pattern, we have to first do soft reset. 1310 */ 1311 1312 ret = dp_ctrl_link_train(ctrl, training_step); 1313 1314 return ret; 1315 } 1316 1317 static void dp_ctrl_set_clock_rate(struct dp_ctrl_private *ctrl, 1318 enum dp_pm_type module, char *name, unsigned long rate) 1319 { 1320 u32 num = ctrl->parser->mp[module].num_clk; 1321 struct clk_bulk_data *cfg = ctrl->parser->mp[module].clocks; 1322 1323 while (num && strcmp(cfg->id, name)) { 1324 num--; 1325 cfg++; 1326 } 1327 1328 drm_dbg_dp(ctrl->drm_dev, "setting rate=%lu on clk=%s\n", 1329 rate, name); 1330 1331 if (num) 1332 clk_set_rate(cfg->clk, rate); 1333 else 1334 DRM_ERROR("%s clock doesn't exit to set rate %lu\n", 1335 name, rate); 1336 } 1337 1338 static int dp_ctrl_enable_mainlink_clocks(struct dp_ctrl_private *ctrl) 1339 { 1340 int ret = 0; 1341 struct dp_io *dp_io = &ctrl->parser->io; 1342 struct phy *phy = dp_io->phy; 1343 struct phy_configure_opts_dp *opts_dp = &dp_io->phy_opts.dp; 1344 const u8 *dpcd = ctrl->panel->dpcd; 1345 1346 opts_dp->lanes = ctrl->link->link_params.num_lanes; 1347 opts_dp->link_rate = ctrl->link->link_params.rate / 100; 1348 opts_dp->ssc = drm_dp_max_downspread(dpcd); 1349 1350 phy_configure(phy, &dp_io->phy_opts); 1351 phy_power_on(phy); 1352 1353 dev_pm_opp_set_rate(ctrl->dev, ctrl->link->link_params.rate * 1000); 1354 ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, true); 1355 if (ret) 1356 DRM_ERROR("Unable to start link clocks. ret=%d\n", ret); 1357 1358 drm_dbg_dp(ctrl->drm_dev, "link rate=%d\n", ctrl->link->link_params.rate); 1359 1360 return ret; 1361 } 1362 1363 void dp_ctrl_reset_irq_ctrl(struct dp_ctrl *dp_ctrl, bool enable) 1364 { 1365 struct dp_ctrl_private *ctrl; 1366 1367 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl); 1368 1369 dp_catalog_ctrl_reset(ctrl->catalog); 1370 1371 /* 1372 * all dp controller programmable registers will not 1373 * be reset to default value after DP_SW_RESET 1374 * therefore interrupt mask bits have to be updated 1375 * to enable/disable interrupts 1376 */ 1377 dp_catalog_ctrl_enable_irq(ctrl->catalog, enable); 1378 } 1379 1380 void dp_ctrl_config_psr(struct dp_ctrl *dp_ctrl) 1381 { 1382 u8 cfg; 1383 struct dp_ctrl_private *ctrl = container_of(dp_ctrl, 1384 struct dp_ctrl_private, dp_ctrl); 1385 1386 if (!ctrl->panel->psr_cap.version) 1387 return; 1388 1389 dp_catalog_ctrl_config_psr(ctrl->catalog); 1390 1391 cfg = DP_PSR_ENABLE; 1392 drm_dp_dpcd_write(ctrl->aux, DP_PSR_EN_CFG, &cfg, 1); 1393 } 1394 1395 void dp_ctrl_set_psr(struct dp_ctrl *dp_ctrl, bool enter) 1396 { 1397 struct dp_ctrl_private *ctrl = container_of(dp_ctrl, 1398 struct dp_ctrl_private, dp_ctrl); 1399 1400 if (!ctrl->panel->psr_cap.version) 1401 return; 1402 1403 /* 1404 * When entering PSR, 1405 * 1. Send PSR enter SDP and wait for the PSR_UPDATE_INT 1406 * 2. Turn off video 1407 * 3. Disable the mainlink 1408 * 1409 * When exiting PSR, 1410 * 1. Enable the mainlink 1411 * 2. Send the PSR exit SDP 1412 */ 1413 if (enter) { 1414 reinit_completion(&ctrl->psr_op_comp); 1415 dp_catalog_ctrl_set_psr(ctrl->catalog, true); 1416 1417 if (!wait_for_completion_timeout(&ctrl->psr_op_comp, 1418 PSR_OPERATION_COMPLETION_TIMEOUT_JIFFIES)) { 1419 DRM_ERROR("PSR_ENTRY timedout\n"); 1420 dp_catalog_ctrl_set_psr(ctrl->catalog, false); 1421 return; 1422 } 1423 1424 dp_ctrl_push_idle(dp_ctrl); 1425 dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0); 1426 1427 dp_catalog_ctrl_psr_mainlink_enable(ctrl->catalog, false); 1428 } else { 1429 dp_catalog_ctrl_psr_mainlink_enable(ctrl->catalog, true); 1430 1431 dp_catalog_ctrl_set_psr(ctrl->catalog, false); 1432 dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO); 1433 dp_ctrl_wait4video_ready(ctrl); 1434 dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0); 1435 } 1436 } 1437 1438 void dp_ctrl_phy_init(struct dp_ctrl *dp_ctrl) 1439 { 1440 struct dp_ctrl_private *ctrl; 1441 struct dp_io *dp_io; 1442 struct phy *phy; 1443 1444 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl); 1445 dp_io = &ctrl->parser->io; 1446 phy = dp_io->phy; 1447 1448 dp_catalog_ctrl_phy_reset(ctrl->catalog); 1449 phy_init(phy); 1450 1451 drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n", 1452 phy, phy->init_count, phy->power_count); 1453 } 1454 1455 void dp_ctrl_phy_exit(struct dp_ctrl *dp_ctrl) 1456 { 1457 struct dp_ctrl_private *ctrl; 1458 struct dp_io *dp_io; 1459 struct phy *phy; 1460 1461 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl); 1462 dp_io = &ctrl->parser->io; 1463 phy = dp_io->phy; 1464 1465 dp_catalog_ctrl_phy_reset(ctrl->catalog); 1466 phy_exit(phy); 1467 drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n", 1468 phy, phy->init_count, phy->power_count); 1469 } 1470 1471 static bool dp_ctrl_use_fixed_nvid(struct dp_ctrl_private *ctrl) 1472 { 1473 const u8 *dpcd = ctrl->panel->dpcd; 1474 1475 /* 1476 * For better interop experience, used a fixed NVID=0x8000 1477 * whenever connected to a VGA dongle downstream. 1478 */ 1479 if (drm_dp_is_branch(dpcd)) 1480 return (drm_dp_has_quirk(&ctrl->panel->desc, 1481 DP_DPCD_QUIRK_CONSTANT_N)); 1482 1483 return false; 1484 } 1485 1486 static int dp_ctrl_reinitialize_mainlink(struct dp_ctrl_private *ctrl) 1487 { 1488 int ret = 0; 1489 struct dp_io *dp_io = &ctrl->parser->io; 1490 struct phy *phy = dp_io->phy; 1491 struct phy_configure_opts_dp *opts_dp = &dp_io->phy_opts.dp; 1492 1493 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false); 1494 opts_dp->lanes = ctrl->link->link_params.num_lanes; 1495 phy_configure(phy, &dp_io->phy_opts); 1496 /* 1497 * Disable and re-enable the mainlink clock since the 1498 * link clock might have been adjusted as part of the 1499 * link maintenance. 1500 */ 1501 dev_pm_opp_set_rate(ctrl->dev, 0); 1502 ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false); 1503 if (ret) { 1504 DRM_ERROR("Failed to disable clocks. ret=%d\n", ret); 1505 return ret; 1506 } 1507 phy_power_off(phy); 1508 /* hw recommended delay before re-enabling clocks */ 1509 msleep(20); 1510 1511 ret = dp_ctrl_enable_mainlink_clocks(ctrl); 1512 if (ret) { 1513 DRM_ERROR("Failed to enable mainlink clks. ret=%d\n", ret); 1514 return ret; 1515 } 1516 1517 return ret; 1518 } 1519 1520 static int dp_ctrl_deinitialize_mainlink(struct dp_ctrl_private *ctrl) 1521 { 1522 struct dp_io *dp_io; 1523 struct phy *phy; 1524 int ret; 1525 1526 dp_io = &ctrl->parser->io; 1527 phy = dp_io->phy; 1528 1529 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false); 1530 1531 dp_catalog_ctrl_reset(ctrl->catalog); 1532 1533 dev_pm_opp_set_rate(ctrl->dev, 0); 1534 ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false); 1535 if (ret) { 1536 DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret); 1537 } 1538 1539 phy_power_off(phy); 1540 1541 /* aux channel down, reinit phy */ 1542 phy_exit(phy); 1543 phy_init(phy); 1544 1545 drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n", 1546 phy, phy->init_count, phy->power_count); 1547 return 0; 1548 } 1549 1550 static int dp_ctrl_link_maintenance(struct dp_ctrl_private *ctrl) 1551 { 1552 int ret = 0; 1553 int training_step = DP_TRAINING_NONE; 1554 1555 dp_ctrl_push_idle(&ctrl->dp_ctrl); 1556 1557 ctrl->link->phy_params.p_level = 0; 1558 ctrl->link->phy_params.v_level = 0; 1559 1560 ret = dp_ctrl_setup_main_link(ctrl, &training_step); 1561 if (ret) 1562 goto end; 1563 1564 dp_ctrl_clear_training_pattern(ctrl); 1565 1566 dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO); 1567 1568 ret = dp_ctrl_wait4video_ready(ctrl); 1569 end: 1570 return ret; 1571 } 1572 1573 static bool dp_ctrl_send_phy_test_pattern(struct dp_ctrl_private *ctrl) 1574 { 1575 bool success = false; 1576 u32 pattern_sent = 0x0; 1577 u32 pattern_requested = ctrl->link->phy_params.phy_test_pattern_sel; 1578 1579 drm_dbg_dp(ctrl->drm_dev, "request: 0x%x\n", pattern_requested); 1580 1581 if (dp_catalog_ctrl_update_vx_px(ctrl->catalog, 1582 ctrl->link->phy_params.v_level, 1583 ctrl->link->phy_params.p_level)) { 1584 DRM_ERROR("Failed to set v/p levels\n"); 1585 return false; 1586 } 1587 dp_catalog_ctrl_send_phy_pattern(ctrl->catalog, pattern_requested); 1588 dp_ctrl_update_vx_px(ctrl); 1589 dp_link_send_test_response(ctrl->link); 1590 1591 pattern_sent = dp_catalog_ctrl_read_phy_pattern(ctrl->catalog); 1592 1593 switch (pattern_sent) { 1594 case MR_LINK_TRAINING1: 1595 success = (pattern_requested == 1596 DP_PHY_TEST_PATTERN_D10_2); 1597 break; 1598 case MR_LINK_SYMBOL_ERM: 1599 success = ((pattern_requested == 1600 DP_PHY_TEST_PATTERN_ERROR_COUNT) || 1601 (pattern_requested == 1602 DP_PHY_TEST_PATTERN_CP2520)); 1603 break; 1604 case MR_LINK_PRBS7: 1605 success = (pattern_requested == 1606 DP_PHY_TEST_PATTERN_PRBS7); 1607 break; 1608 case MR_LINK_CUSTOM80: 1609 success = (pattern_requested == 1610 DP_PHY_TEST_PATTERN_80BIT_CUSTOM); 1611 break; 1612 case MR_LINK_TRAINING4: 1613 success = (pattern_requested == 1614 DP_PHY_TEST_PATTERN_SEL_MASK); 1615 break; 1616 default: 1617 success = false; 1618 } 1619 1620 drm_dbg_dp(ctrl->drm_dev, "%s: test->0x%x\n", 1621 success ? "success" : "failed", pattern_requested); 1622 return success; 1623 } 1624 1625 static int dp_ctrl_process_phy_test_request(struct dp_ctrl_private *ctrl) 1626 { 1627 int ret; 1628 unsigned long pixel_rate; 1629 1630 if (!ctrl->link->phy_params.phy_test_pattern_sel) { 1631 drm_dbg_dp(ctrl->drm_dev, 1632 "no test pattern selected by sink\n"); 1633 return 0; 1634 } 1635 1636 /* 1637 * The global reset will need DP link related clocks to be 1638 * running. Add the global reset just before disabling the 1639 * link clocks and core clocks. 1640 */ 1641 ret = dp_ctrl_off(&ctrl->dp_ctrl); 1642 if (ret) { 1643 DRM_ERROR("failed to disable DP controller\n"); 1644 return ret; 1645 } 1646 1647 ret = dp_ctrl_on_link(&ctrl->dp_ctrl); 1648 if (ret) { 1649 DRM_ERROR("failed to enable DP link controller\n"); 1650 return ret; 1651 } 1652 1653 pixel_rate = ctrl->panel->dp_mode.drm_mode.clock; 1654 dp_ctrl_set_clock_rate(ctrl, DP_STREAM_PM, "stream_pixel", pixel_rate * 1000); 1655 1656 ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, true); 1657 if (ret) { 1658 DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret); 1659 return ret; 1660 } 1661 1662 dp_ctrl_send_phy_test_pattern(ctrl); 1663 1664 return 0; 1665 } 1666 1667 void dp_ctrl_handle_sink_request(struct dp_ctrl *dp_ctrl) 1668 { 1669 struct dp_ctrl_private *ctrl; 1670 u32 sink_request = 0x0; 1671 1672 if (!dp_ctrl) { 1673 DRM_ERROR("invalid input\n"); 1674 return; 1675 } 1676 1677 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl); 1678 sink_request = ctrl->link->sink_request; 1679 1680 if (sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) { 1681 drm_dbg_dp(ctrl->drm_dev, "PHY_TEST_PATTERN request\n"); 1682 if (dp_ctrl_process_phy_test_request(ctrl)) { 1683 DRM_ERROR("process phy_test_req failed\n"); 1684 return; 1685 } 1686 } 1687 1688 if (sink_request & DP_LINK_STATUS_UPDATED) { 1689 if (dp_ctrl_link_maintenance(ctrl)) { 1690 DRM_ERROR("LM failed: TEST_LINK_TRAINING\n"); 1691 return; 1692 } 1693 } 1694 1695 if (sink_request & DP_TEST_LINK_TRAINING) { 1696 dp_link_send_test_response(ctrl->link); 1697 if (dp_ctrl_link_maintenance(ctrl)) { 1698 DRM_ERROR("LM failed: TEST_LINK_TRAINING\n"); 1699 return; 1700 } 1701 } 1702 } 1703 1704 static bool dp_ctrl_clock_recovery_any_ok( 1705 const u8 link_status[DP_LINK_STATUS_SIZE], 1706 int lane_count) 1707 { 1708 int reduced_cnt; 1709 1710 if (lane_count <= 1) 1711 return false; 1712 1713 /* 1714 * only interested in the lane number after reduced 1715 * lane_count = 4, then only interested in 2 lanes 1716 * lane_count = 2, then only interested in 1 lane 1717 */ 1718 reduced_cnt = lane_count >> 1; 1719 1720 return drm_dp_clock_recovery_ok(link_status, reduced_cnt); 1721 } 1722 1723 static bool dp_ctrl_channel_eq_ok(struct dp_ctrl_private *ctrl) 1724 { 1725 u8 link_status[DP_LINK_STATUS_SIZE]; 1726 int num_lanes = ctrl->link->link_params.num_lanes; 1727 1728 dp_ctrl_read_link_status(ctrl, link_status); 1729 1730 return drm_dp_channel_eq_ok(link_status, num_lanes); 1731 } 1732 1733 int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl) 1734 { 1735 int rc = 0; 1736 struct dp_ctrl_private *ctrl; 1737 u32 rate; 1738 int link_train_max_retries = 5; 1739 u32 const phy_cts_pixel_clk_khz = 148500; 1740 u8 link_status[DP_LINK_STATUS_SIZE]; 1741 unsigned int training_step; 1742 unsigned long pixel_rate; 1743 1744 if (!dp_ctrl) 1745 return -EINVAL; 1746 1747 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl); 1748 1749 rate = ctrl->panel->link_info.rate; 1750 pixel_rate = ctrl->panel->dp_mode.drm_mode.clock; 1751 1752 dp_power_clk_enable(ctrl->power, DP_CORE_PM, true); 1753 1754 if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) { 1755 drm_dbg_dp(ctrl->drm_dev, 1756 "using phy test link parameters\n"); 1757 if (!pixel_rate) 1758 pixel_rate = phy_cts_pixel_clk_khz; 1759 } else { 1760 ctrl->link->link_params.rate = rate; 1761 ctrl->link->link_params.num_lanes = 1762 ctrl->panel->link_info.num_lanes; 1763 } 1764 1765 drm_dbg_dp(ctrl->drm_dev, "rate=%d, num_lanes=%d, pixel_rate=%lu\n", 1766 ctrl->link->link_params.rate, ctrl->link->link_params.num_lanes, 1767 pixel_rate); 1768 1769 rc = dp_ctrl_enable_mainlink_clocks(ctrl); 1770 if (rc) 1771 return rc; 1772 1773 while (--link_train_max_retries) { 1774 training_step = DP_TRAINING_NONE; 1775 rc = dp_ctrl_setup_main_link(ctrl, &training_step); 1776 if (rc == 0) { 1777 /* training completed successfully */ 1778 break; 1779 } else if (training_step == DP_TRAINING_1) { 1780 /* link train_1 failed */ 1781 if (!dp_catalog_link_is_connected(ctrl->catalog)) 1782 break; 1783 1784 dp_ctrl_read_link_status(ctrl, link_status); 1785 1786 rc = dp_ctrl_link_rate_down_shift(ctrl); 1787 if (rc < 0) { /* already in RBR = 1.6G */ 1788 if (dp_ctrl_clock_recovery_any_ok(link_status, 1789 ctrl->link->link_params.num_lanes)) { 1790 /* 1791 * some lanes are ready, 1792 * reduce lane number 1793 */ 1794 rc = dp_ctrl_link_lane_down_shift(ctrl); 1795 if (rc < 0) { /* lane == 1 already */ 1796 /* end with failure */ 1797 break; 1798 } 1799 } else { 1800 /* end with failure */ 1801 break; /* lane == 1 already */ 1802 } 1803 } 1804 } else if (training_step == DP_TRAINING_2) { 1805 /* link train_2 failed */ 1806 if (!dp_catalog_link_is_connected(ctrl->catalog)) 1807 break; 1808 1809 dp_ctrl_read_link_status(ctrl, link_status); 1810 1811 if (!drm_dp_clock_recovery_ok(link_status, 1812 ctrl->link->link_params.num_lanes)) 1813 rc = dp_ctrl_link_rate_down_shift(ctrl); 1814 else 1815 rc = dp_ctrl_link_lane_down_shift(ctrl); 1816 1817 if (rc < 0) { 1818 /* end with failure */ 1819 break; /* lane == 1 already */ 1820 } 1821 1822 /* stop link training before start re training */ 1823 dp_ctrl_clear_training_pattern(ctrl); 1824 } 1825 1826 rc = dp_ctrl_reinitialize_mainlink(ctrl); 1827 if (rc) { 1828 DRM_ERROR("Failed to reinitialize mainlink. rc=%d\n", rc); 1829 break; 1830 } 1831 } 1832 1833 if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) 1834 return rc; 1835 1836 if (rc == 0) { /* link train successfully */ 1837 /* 1838 * do not stop train pattern here 1839 * stop link training at on_stream 1840 * to pass compliance test 1841 */ 1842 } else { 1843 /* 1844 * link training failed 1845 * end txing train pattern here 1846 */ 1847 dp_ctrl_clear_training_pattern(ctrl); 1848 1849 dp_ctrl_deinitialize_mainlink(ctrl); 1850 rc = -ECONNRESET; 1851 } 1852 1853 return rc; 1854 } 1855 1856 static int dp_ctrl_link_retrain(struct dp_ctrl_private *ctrl) 1857 { 1858 int training_step = DP_TRAINING_NONE; 1859 1860 return dp_ctrl_setup_main_link(ctrl, &training_step); 1861 } 1862 1863 int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl, bool force_link_train) 1864 { 1865 int ret = 0; 1866 bool mainlink_ready = false; 1867 struct dp_ctrl_private *ctrl; 1868 unsigned long pixel_rate; 1869 unsigned long pixel_rate_orig; 1870 1871 if (!dp_ctrl) 1872 return -EINVAL; 1873 1874 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl); 1875 1876 pixel_rate = pixel_rate_orig = ctrl->panel->dp_mode.drm_mode.clock; 1877 1878 if (dp_ctrl->wide_bus_en) 1879 pixel_rate >>= 1; 1880 1881 drm_dbg_dp(ctrl->drm_dev, "rate=%d, num_lanes=%d, pixel_rate=%lu\n", 1882 ctrl->link->link_params.rate, 1883 ctrl->link->link_params.num_lanes, pixel_rate); 1884 1885 if (!dp_power_clk_status(ctrl->power, DP_CTRL_PM)) { /* link clk is off */ 1886 ret = dp_ctrl_enable_mainlink_clocks(ctrl); 1887 if (ret) { 1888 DRM_ERROR("Failed to start link clocks. ret=%d\n", ret); 1889 goto end; 1890 } 1891 } 1892 1893 dp_ctrl_set_clock_rate(ctrl, DP_STREAM_PM, "stream_pixel", pixel_rate * 1000); 1894 1895 ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, true); 1896 if (ret) { 1897 DRM_ERROR("Unable to start pixel clocks. ret=%d\n", ret); 1898 goto end; 1899 } 1900 1901 if (force_link_train || !dp_ctrl_channel_eq_ok(ctrl)) 1902 dp_ctrl_link_retrain(ctrl); 1903 1904 /* stop txing train pattern to end link training */ 1905 dp_ctrl_clear_training_pattern(ctrl); 1906 1907 /* 1908 * Set up transfer unit values and set controller state to send 1909 * video. 1910 */ 1911 reinit_completion(&ctrl->video_comp); 1912 1913 dp_ctrl_configure_source_params(ctrl); 1914 1915 dp_catalog_ctrl_config_msa(ctrl->catalog, 1916 ctrl->link->link_params.rate, 1917 pixel_rate_orig, dp_ctrl_use_fixed_nvid(ctrl)); 1918 1919 dp_ctrl_setup_tr_unit(ctrl); 1920 1921 dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO); 1922 1923 ret = dp_ctrl_wait4video_ready(ctrl); 1924 if (ret) 1925 return ret; 1926 1927 mainlink_ready = dp_catalog_ctrl_mainlink_ready(ctrl->catalog); 1928 drm_dbg_dp(ctrl->drm_dev, 1929 "mainlink %s\n", mainlink_ready ? "READY" : "NOT READY"); 1930 1931 end: 1932 return ret; 1933 } 1934 1935 int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl) 1936 { 1937 struct dp_ctrl_private *ctrl; 1938 struct dp_io *dp_io; 1939 struct phy *phy; 1940 int ret; 1941 1942 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl); 1943 dp_io = &ctrl->parser->io; 1944 phy = dp_io->phy; 1945 1946 /* set dongle to D3 (power off) mode */ 1947 dp_link_psm_config(ctrl->link, &ctrl->panel->link_info, true); 1948 1949 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false); 1950 1951 if (dp_power_clk_status(ctrl->power, DP_STREAM_PM)) { 1952 ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, false); 1953 if (ret) { 1954 DRM_ERROR("Failed to disable pclk. ret=%d\n", ret); 1955 return ret; 1956 } 1957 } 1958 1959 dev_pm_opp_set_rate(ctrl->dev, 0); 1960 ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false); 1961 if (ret) { 1962 DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret); 1963 return ret; 1964 } 1965 1966 phy_power_off(phy); 1967 1968 /* aux channel down, reinit phy */ 1969 phy_exit(phy); 1970 phy_init(phy); 1971 1972 drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n", 1973 phy, phy->init_count, phy->power_count); 1974 return ret; 1975 } 1976 1977 int dp_ctrl_off_link(struct dp_ctrl *dp_ctrl) 1978 { 1979 struct dp_ctrl_private *ctrl; 1980 struct dp_io *dp_io; 1981 struct phy *phy; 1982 int ret; 1983 1984 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl); 1985 dp_io = &ctrl->parser->io; 1986 phy = dp_io->phy; 1987 1988 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false); 1989 1990 ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false); 1991 if (ret) { 1992 DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret); 1993 } 1994 1995 DRM_DEBUG_DP("Before, phy=%p init_count=%d power_on=%d\n", 1996 phy, phy->init_count, phy->power_count); 1997 1998 phy_power_off(phy); 1999 2000 DRM_DEBUG_DP("After, phy=%p init_count=%d power_on=%d\n", 2001 phy, phy->init_count, phy->power_count); 2002 2003 return ret; 2004 } 2005 2006 int dp_ctrl_off(struct dp_ctrl *dp_ctrl) 2007 { 2008 struct dp_ctrl_private *ctrl; 2009 struct dp_io *dp_io; 2010 struct phy *phy; 2011 int ret = 0; 2012 2013 if (!dp_ctrl) 2014 return -EINVAL; 2015 2016 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl); 2017 dp_io = &ctrl->parser->io; 2018 phy = dp_io->phy; 2019 2020 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false); 2021 2022 dp_catalog_ctrl_reset(ctrl->catalog); 2023 2024 ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, false); 2025 if (ret) 2026 DRM_ERROR("Failed to disable pixel clocks. ret=%d\n", ret); 2027 2028 dev_pm_opp_set_rate(ctrl->dev, 0); 2029 ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false); 2030 if (ret) { 2031 DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret); 2032 } 2033 2034 phy_power_off(phy); 2035 drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n", 2036 phy, phy->init_count, phy->power_count); 2037 2038 return ret; 2039 } 2040 2041 irqreturn_t dp_ctrl_isr(struct dp_ctrl *dp_ctrl) 2042 { 2043 struct dp_ctrl_private *ctrl; 2044 u32 isr; 2045 irqreturn_t ret = IRQ_NONE; 2046 2047 if (!dp_ctrl) 2048 return IRQ_NONE; 2049 2050 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl); 2051 2052 if (ctrl->panel->psr_cap.version) { 2053 isr = dp_catalog_ctrl_read_psr_interrupt_status(ctrl->catalog); 2054 2055 if (isr) 2056 complete(&ctrl->psr_op_comp); 2057 2058 if (isr & PSR_EXIT_INT) 2059 drm_dbg_dp(ctrl->drm_dev, "PSR exit done\n"); 2060 2061 if (isr & PSR_UPDATE_INT) 2062 drm_dbg_dp(ctrl->drm_dev, "PSR frame update done\n"); 2063 2064 if (isr & PSR_CAPTURE_INT) 2065 drm_dbg_dp(ctrl->drm_dev, "PSR frame capture done\n"); 2066 } 2067 2068 isr = dp_catalog_ctrl_get_interrupt(ctrl->catalog); 2069 2070 2071 if (isr & DP_CTRL_INTR_READY_FOR_VIDEO) { 2072 drm_dbg_dp(ctrl->drm_dev, "dp_video_ready\n"); 2073 complete(&ctrl->video_comp); 2074 ret = IRQ_HANDLED; 2075 } 2076 2077 if (isr & DP_CTRL_INTR_IDLE_PATTERN_SENT) { 2078 drm_dbg_dp(ctrl->drm_dev, "idle_patterns_sent\n"); 2079 complete(&ctrl->idle_comp); 2080 ret = IRQ_HANDLED; 2081 } 2082 2083 return ret; 2084 } 2085 2086 struct dp_ctrl *dp_ctrl_get(struct device *dev, struct dp_link *link, 2087 struct dp_panel *panel, struct drm_dp_aux *aux, 2088 struct dp_power *power, struct dp_catalog *catalog, 2089 struct dp_parser *parser) 2090 { 2091 struct dp_ctrl_private *ctrl; 2092 int ret; 2093 2094 if (!dev || !panel || !aux || 2095 !link || !catalog) { 2096 DRM_ERROR("invalid input\n"); 2097 return ERR_PTR(-EINVAL); 2098 } 2099 2100 ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL); 2101 if (!ctrl) { 2102 DRM_ERROR("Mem allocation failure\n"); 2103 return ERR_PTR(-ENOMEM); 2104 } 2105 2106 ret = devm_pm_opp_set_clkname(dev, "ctrl_link"); 2107 if (ret) { 2108 dev_err(dev, "invalid DP OPP table in device tree\n"); 2109 /* caller do PTR_ERR(opp_table) */ 2110 return (struct dp_ctrl *)ERR_PTR(ret); 2111 } 2112 2113 /* OPP table is optional */ 2114 ret = devm_pm_opp_of_add_table(dev); 2115 if (ret) 2116 dev_err(dev, "failed to add DP OPP table\n"); 2117 2118 init_completion(&ctrl->idle_comp); 2119 init_completion(&ctrl->psr_op_comp); 2120 init_completion(&ctrl->video_comp); 2121 2122 /* in parameters */ 2123 ctrl->parser = parser; 2124 ctrl->panel = panel; 2125 ctrl->power = power; 2126 ctrl->aux = aux; 2127 ctrl->link = link; 2128 ctrl->catalog = catalog; 2129 ctrl->dev = dev; 2130 2131 return &ctrl->dp_ctrl; 2132 } 2133