drivers/gpu/drm/msm/dp/dp_ctrl.c

   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 WAIT_FOR_VIDEO_READY_TIMEOUT_JIFFIES (HZ / 2)
  26
  27 #define DP_CTRL_INTR_READY_FOR_VIDEO     BIT(0)
  28 #define DP_CTRL_INTR_IDLE_PATTERN_SENT  BIT(3)
  29
  30 #define MR_LINK_TRAINING1  0x8
  31 #define MR_LINK_SYMBOL_ERM 0x80
  32 #define MR_LINK_PRBS7 0x100
  33 #define MR_LINK_CUSTOM80 0x200
  34 #define MR_LINK_TRAINING4  0x40
  35
  36 enum {
  37         DP_TRAINING_NONE,
  38         DP_TRAINING_1,
  39         DP_TRAINING_2,
  40 };
  41
  42 struct dp_tu_calc_input {
  43         u64 lclk;        /* 162, 270, 540 and 810 */
  44         u64 pclk_khz;    /* in KHz */
  45         u64 hactive;     /* active h-width */
  46         u64 hporch;      /* bp + fp + pulse */
  47         int nlanes;      /* no.of.lanes */
  48         int bpp;         /* bits */
  49         int pixel_enc;   /* 444, 420, 422 */
  50         int dsc_en;     /* dsc on/off */
  51         int async_en;   /* async mode */
  52         int fec_en;     /* fec */
  53         int compress_ratio; /* 2:1 = 200, 3:1 = 300, 3.75:1 = 375 */
  54         int num_of_dsc_slices; /* number of slices per line */
  55 };
  56
  57 struct dp_vc_tu_mapping_table {
  58         u32 vic;
  59         u8 lanes;
  60         u8 lrate; /* DP_LINK_RATE -> 162(6), 270(10), 540(20), 810 (30) */
  61         u8 bpp;
  62         u8 valid_boundary_link;
  63         u16 delay_start_link;
  64         bool boundary_moderation_en;
  65         u8 valid_lower_boundary_link;
  66         u8 upper_boundary_count;
  67         u8 lower_boundary_count;
  68         u8 tu_size_minus1;
  69 };
  70
  71 struct dp_ctrl_private {
  72         struct dp_ctrl dp_ctrl;
  73         struct drm_device *drm_dev;
  74         struct device *dev;
  75         struct drm_dp_aux *aux;
  76         struct dp_panel *panel;
  77         struct dp_link *link;
  78         struct dp_power *power;
  79         struct dp_parser *parser;
  80         struct dp_catalog *catalog;
  81
  82         struct completion idle_comp;
  83         struct completion video_comp;
  84 };
  85
  86 static int dp_aux_link_configure(struct drm_dp_aux *aux,
  87                                         struct dp_link_info *link)
  88 {
  89         u8 values[2];
  90         int err;
  91
  92         values[0] = drm_dp_link_rate_to_bw_code(link->rate);
  93         values[1] = link->num_lanes;
  94
  95         if (link->capabilities & DP_LINK_CAP_ENHANCED_FRAMING)
  96                 values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
  97
  98         err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values));
  99         if (err < 0)
 100                 return err;
 101
 102         return 0;
 103 }
 104
 105 void dp_ctrl_push_idle(struct dp_ctrl *dp_ctrl)
 106 {
 107         struct dp_ctrl_private *ctrl;
 108
 109         ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
 110
 111         reinit_completion(&ctrl->idle_comp);
 112         dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_PUSH_IDLE);
 113
 114         if (!wait_for_completion_timeout(&ctrl->idle_comp,
 115                         IDLE_PATTERN_COMPLETION_TIMEOUT_JIFFIES))
 116                 pr_warn("PUSH_IDLE pattern timedout\n");
 117
 118         drm_dbg_dp(ctrl->drm_dev, "mainlink off\n");
 119 }
 120
 121 static void dp_ctrl_config_ctrl(struct dp_ctrl_private *ctrl)
 122 {
 123         u32 config = 0, tbd;
 124         const u8 *dpcd = ctrl->panel->dpcd;
 125
 126         /* Default-> LSCLK DIV: 1/4 LCLK  */
 127         config |= (2 << DP_CONFIGURATION_CTRL_LSCLK_DIV_SHIFT);
 128
 129         /* Scrambler reset enable */
 130         if (drm_dp_alternate_scrambler_reset_cap(dpcd))
 131                 config |= DP_CONFIGURATION_CTRL_ASSR;
 132
 133         tbd = dp_link_get_test_bits_depth(ctrl->link,
 134                         ctrl->panel->dp_mode.bpp);
 135
 136         if (tbd == DP_TEST_BIT_DEPTH_UNKNOWN) {
 137                 pr_debug("BIT_DEPTH not set. Configure default\n");
 138                 tbd = DP_TEST_BIT_DEPTH_8;
 139         }
 140
 141         config |= tbd << DP_CONFIGURATION_CTRL_BPC_SHIFT;
 142
 143         /* Num of Lanes */
 144         config |= ((ctrl->link->link_params.num_lanes - 1)
 145                         << DP_CONFIGURATION_CTRL_NUM_OF_LANES_SHIFT);
 146
 147         if (drm_dp_enhanced_frame_cap(dpcd))
 148                 config |= DP_CONFIGURATION_CTRL_ENHANCED_FRAMING;
 149
 150         config |= DP_CONFIGURATION_CTRL_P_INTERLACED; /* progressive video */
 151
 152         /* sync clock & static Mvid */
 153         config |= DP_CONFIGURATION_CTRL_STATIC_DYNAMIC_CN;
 154         config |= DP_CONFIGURATION_CTRL_SYNC_ASYNC_CLK;
 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_VOLTAGE_SWING_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_PRE_EMPHASIS_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_VOLTAGE_SWING_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 | DP_RECOVERED_CLOCK_OUT_EN);
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_reinitialize_mainlink(struct dp_ctrl_private *ctrl);
1242
1243 static int dp_ctrl_link_train(struct dp_ctrl_private *ctrl,
1244                         int *training_step)
1245 {
1246         int ret = 0;
1247         const u8 *dpcd = ctrl->panel->dpcd;
1248         u8 encoding = DP_SET_ANSI_8B10B;
1249         u8 ssc;
1250         u8 assr;
1251         struct dp_link_info link_info = {0};
1252
1253         dp_ctrl_config_ctrl(ctrl);
1254
1255         link_info.num_lanes = ctrl->link->link_params.num_lanes;
1256         link_info.rate = ctrl->link->link_params.rate;
1257         link_info.capabilities = DP_LINK_CAP_ENHANCED_FRAMING;
1258
1259         dp_aux_link_configure(ctrl->aux, &link_info);
1260
1261         if (drm_dp_max_downspread(dpcd)) {
1262                 ssc = DP_SPREAD_AMP_0_5;
1263                 drm_dp_dpcd_write(ctrl->aux, DP_DOWNSPREAD_CTRL, &ssc, 1);
1264         }
1265
1266         drm_dp_dpcd_write(ctrl->aux, DP_MAIN_LINK_CHANNEL_CODING_SET,
1267                                 &encoding, 1);
1268
1269         if (drm_dp_alternate_scrambler_reset_cap(dpcd)) {
1270                 assr = DP_ALTERNATE_SCRAMBLER_RESET_ENABLE;
1271                 drm_dp_dpcd_write(ctrl->aux, DP_EDP_CONFIGURATION_SET,
1272                                 &assr, 1);
1273         }
1274
1275         ret = dp_ctrl_link_train_1(ctrl, training_step);
1276         if (ret) {
1277                 DRM_ERROR("link training #1 failed. ret=%d\n", ret);
1278                 goto end;
1279         }
1280
1281         /* print success info as this is a result of user initiated action */
1282         drm_dbg_dp(ctrl->drm_dev, "link training #1 successful\n");
1283
1284         ret = dp_ctrl_link_train_2(ctrl, training_step);
1285         if (ret) {
1286                 DRM_ERROR("link training #2 failed. ret=%d\n", ret);
1287                 goto end;
1288         }
1289
1290         /* print success info as this is a result of user initiated action */
1291         drm_dbg_dp(ctrl->drm_dev, "link training #2 successful\n");
1292
1293 end:
1294         dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);
1295
1296         return ret;
1297 }
1298
1299 static int dp_ctrl_setup_main_link(struct dp_ctrl_private *ctrl,
1300                         int *training_step)
1301 {
1302         int ret = 0;
1303
1304         dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, true);
1305
1306         if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN)
1307                 return ret;
1308
1309         /*
1310          * As part of previous calls, DP controller state might have
1311          * transitioned to PUSH_IDLE. In order to start transmitting
1312          * a link training pattern, we have to first do soft reset.
1313          */
1314
1315         ret = dp_ctrl_link_train(ctrl, training_step);
1316
1317         return ret;
1318 }
1319
1320 static void dp_ctrl_set_clock_rate(struct dp_ctrl_private *ctrl,
1321                         enum dp_pm_type module, char *name, unsigned long rate)
1322 {
1323         u32 num = ctrl->parser->mp[module].num_clk;
1324         struct clk_bulk_data *cfg = ctrl->parser->mp[module].clocks;
1325
1326         while (num && strcmp(cfg->id, name)) {
1327                 num--;
1328                 cfg++;
1329         }
1330
1331         drm_dbg_dp(ctrl->drm_dev, "setting rate=%lu on clk=%s\n",
1332                                                 rate, name);
1333
1334         if (num)
1335                 clk_set_rate(cfg->clk, rate);
1336         else
1337                 DRM_ERROR("%s clock doesn't exit to set rate %lu\n",
1338                                 name, rate);
1339 }
1340
1341 static int dp_ctrl_enable_mainlink_clocks(struct dp_ctrl_private *ctrl)
1342 {
1343         int ret = 0;
1344         struct dp_io *dp_io = &ctrl->parser->io;
1345         struct phy *phy = dp_io->phy;
1346         struct phy_configure_opts_dp *opts_dp = &dp_io->phy_opts.dp;
1347         const u8 *dpcd = ctrl->panel->dpcd;
1348
1349         opts_dp->lanes = ctrl->link->link_params.num_lanes;
1350         opts_dp->link_rate = ctrl->link->link_params.rate / 100;
1351         opts_dp->ssc = drm_dp_max_downspread(dpcd);
1352
1353         phy_configure(phy, &dp_io->phy_opts);
1354         phy_power_on(phy);
1355
1356         dev_pm_opp_set_rate(ctrl->dev, ctrl->link->link_params.rate * 1000);
1357         ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, true);
1358         if (ret)
1359                 DRM_ERROR("Unable to start link clocks. ret=%d\n", ret);
1360
1361         drm_dbg_dp(ctrl->drm_dev, "link rate=%d pixel_clk=%d\n",
1362                 ctrl->link->link_params.rate, ctrl->dp_ctrl.pixel_rate);
1363
1364         return ret;
1365 }
1366
1367 static int dp_ctrl_enable_stream_clocks(struct dp_ctrl_private *ctrl)
1368 {
1369         int ret = 0;
1370
1371         dp_ctrl_set_clock_rate(ctrl, DP_STREAM_PM, "stream_pixel",
1372                                         ctrl->dp_ctrl.pixel_rate * 1000);
1373
1374         ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, true);
1375         if (ret)
1376                 DRM_ERROR("Unabled to start pixel clocks. ret=%d\n", ret);
1377
1378         drm_dbg_dp(ctrl->drm_dev, "link rate=%d pixel_clk=%d\n",
1379                         ctrl->link->link_params.rate, ctrl->dp_ctrl.pixel_rate);
1380
1381         return ret;
1382 }
1383
1384 void dp_ctrl_reset_irq_ctrl(struct dp_ctrl *dp_ctrl, bool enable)
1385 {
1386         struct dp_ctrl_private *ctrl;
1387
1388         ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1389
1390         dp_catalog_ctrl_reset(ctrl->catalog);
1391
1392         /*
1393          * all dp controller programmable registers will not
1394          * be reset to default value after DP_SW_RESET
1395          * therefore interrupt mask bits have to be updated
1396          * to enable/disable interrupts
1397          */
1398         dp_catalog_ctrl_enable_irq(ctrl->catalog, enable);
1399 }
1400
1401 void dp_ctrl_phy_init(struct dp_ctrl *dp_ctrl)
1402 {
1403         struct dp_ctrl_private *ctrl;
1404         struct dp_io *dp_io;
1405         struct phy *phy;
1406
1407         ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1408         dp_io = &ctrl->parser->io;
1409         phy = dp_io->phy;
1410
1411         dp_catalog_ctrl_phy_reset(ctrl->catalog);
1412         phy_init(phy);
1413
1414         drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
1415                         phy, phy->init_count, phy->power_count);
1416 }
1417
1418 void dp_ctrl_phy_exit(struct dp_ctrl *dp_ctrl)
1419 {
1420         struct dp_ctrl_private *ctrl;
1421         struct dp_io *dp_io;
1422         struct phy *phy;
1423
1424         ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1425         dp_io = &ctrl->parser->io;
1426         phy = dp_io->phy;
1427
1428         dp_catalog_ctrl_phy_reset(ctrl->catalog);
1429         phy_exit(phy);
1430         drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
1431                         phy, phy->init_count, phy->power_count);
1432 }
1433
1434 static bool dp_ctrl_use_fixed_nvid(struct dp_ctrl_private *ctrl)
1435 {
1436         const u8 *dpcd = ctrl->panel->dpcd;
1437
1438         /*
1439          * For better interop experience, used a fixed NVID=0x8000
1440          * whenever connected to a VGA dongle downstream.
1441          */
1442         if (drm_dp_is_branch(dpcd))
1443                 return (drm_dp_has_quirk(&ctrl->panel->desc,
1444                                          DP_DPCD_QUIRK_CONSTANT_N));
1445
1446         return false;
1447 }
1448
1449 static int dp_ctrl_reinitialize_mainlink(struct dp_ctrl_private *ctrl)
1450 {
1451         int ret = 0;
1452         struct dp_io *dp_io = &ctrl->parser->io;
1453         struct phy *phy = dp_io->phy;
1454         struct phy_configure_opts_dp *opts_dp = &dp_io->phy_opts.dp;
1455
1456         dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
1457         opts_dp->lanes = ctrl->link->link_params.num_lanes;
1458         phy_configure(phy, &dp_io->phy_opts);
1459         /*
1460          * Disable and re-enable the mainlink clock since the
1461          * link clock might have been adjusted as part of the
1462          * link maintenance.
1463          */
1464         dev_pm_opp_set_rate(ctrl->dev, 0);
1465         ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
1466         if (ret) {
1467                 DRM_ERROR("Failed to disable clocks. ret=%d\n", ret);
1468                 return ret;
1469         }
1470         phy_power_off(phy);
1471         /* hw recommended delay before re-enabling clocks */
1472         msleep(20);
1473
1474         ret = dp_ctrl_enable_mainlink_clocks(ctrl);
1475         if (ret) {
1476                 DRM_ERROR("Failed to enable mainlink clks. ret=%d\n", ret);
1477                 return ret;
1478         }
1479
1480         return ret;
1481 }
1482
1483 static int dp_ctrl_deinitialize_mainlink(struct dp_ctrl_private *ctrl)
1484 {
1485         struct dp_io *dp_io;
1486         struct phy *phy;
1487         int ret;
1488
1489         dp_io = &ctrl->parser->io;
1490         phy = dp_io->phy;
1491
1492         dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
1493
1494         dp_catalog_ctrl_reset(ctrl->catalog);
1495
1496         dev_pm_opp_set_rate(ctrl->dev, 0);
1497         ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
1498         if (ret) {
1499                 DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
1500         }
1501
1502         phy_power_off(phy);
1503
1504         /* aux channel down, reinit phy */
1505         phy_exit(phy);
1506         phy_init(phy);
1507
1508         drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
1509                         phy, phy->init_count, phy->power_count);
1510         return 0;
1511 }
1512
1513 static int dp_ctrl_link_maintenance(struct dp_ctrl_private *ctrl)
1514 {
1515         int ret = 0;
1516         int training_step = DP_TRAINING_NONE;
1517
1518         dp_ctrl_push_idle(&ctrl->dp_ctrl);
1519
1520         ctrl->link->phy_params.p_level = 0;
1521         ctrl->link->phy_params.v_level = 0;
1522
1523         ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
1524
1525         ret = dp_ctrl_setup_main_link(ctrl, &training_step);
1526         if (ret)
1527                 goto end;
1528
1529         dp_ctrl_clear_training_pattern(ctrl);
1530
1531         dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO);
1532
1533         ret = dp_ctrl_wait4video_ready(ctrl);
1534 end:
1535         return ret;
1536 }
1537
1538 static int dp_ctrl_on_stream_phy_test_report(struct dp_ctrl *dp_ctrl);
1539
1540 static int dp_ctrl_process_phy_test_request(struct dp_ctrl_private *ctrl)
1541 {
1542         int ret = 0;
1543
1544         if (!ctrl->link->phy_params.phy_test_pattern_sel) {
1545                 drm_dbg_dp(ctrl->drm_dev,
1546                         "no test pattern selected by sink\n");
1547                 return ret;
1548         }
1549
1550         /*
1551          * The global reset will need DP link related clocks to be
1552          * running. Add the global reset just before disabling the
1553          * link clocks and core clocks.
1554          */
1555         ret = dp_ctrl_off(&ctrl->dp_ctrl);
1556         if (ret) {
1557                 DRM_ERROR("failed to disable DP controller\n");
1558                 return ret;
1559         }
1560
1561         ret = dp_ctrl_on_link(&ctrl->dp_ctrl);
1562         if (!ret)
1563                 ret = dp_ctrl_on_stream_phy_test_report(&ctrl->dp_ctrl);
1564         else
1565                 DRM_ERROR("failed to enable DP link controller\n");
1566
1567         return ret;
1568 }
1569
1570 static bool dp_ctrl_send_phy_test_pattern(struct dp_ctrl_private *ctrl)
1571 {
1572         bool success = false;
1573         u32 pattern_sent = 0x0;
1574         u32 pattern_requested = ctrl->link->phy_params.phy_test_pattern_sel;
1575
1576         drm_dbg_dp(ctrl->drm_dev, "request: 0x%x\n", pattern_requested);
1577
1578         if (dp_catalog_ctrl_update_vx_px(ctrl->catalog,
1579                         ctrl->link->phy_params.v_level,
1580                         ctrl->link->phy_params.p_level)) {
1581                 DRM_ERROR("Failed to set v/p levels\n");
1582                 return false;
1583         }
1584         dp_catalog_ctrl_send_phy_pattern(ctrl->catalog, pattern_requested);
1585         dp_ctrl_update_vx_px(ctrl);
1586         dp_link_send_test_response(ctrl->link);
1587
1588         pattern_sent = dp_catalog_ctrl_read_phy_pattern(ctrl->catalog);
1589
1590         switch (pattern_sent) {
1591         case MR_LINK_TRAINING1:
1592                 success = (pattern_requested ==
1593                                 DP_PHY_TEST_PATTERN_D10_2);
1594                 break;
1595         case MR_LINK_SYMBOL_ERM:
1596                 success = ((pattern_requested ==
1597                         DP_PHY_TEST_PATTERN_ERROR_COUNT) ||
1598                                 (pattern_requested ==
1599                                 DP_PHY_TEST_PATTERN_CP2520));
1600                 break;
1601         case MR_LINK_PRBS7:
1602                 success = (pattern_requested ==
1603                                 DP_PHY_TEST_PATTERN_PRBS7);
1604                 break;
1605         case MR_LINK_CUSTOM80:
1606                 success = (pattern_requested ==
1607                                 DP_PHY_TEST_PATTERN_80BIT_CUSTOM);
1608                 break;
1609         case MR_LINK_TRAINING4:
1610                 success = (pattern_requested ==
1611                                 DP_PHY_TEST_PATTERN_SEL_MASK);
1612                 break;
1613         default:
1614                 success = false;
1615         }
1616
1617         drm_dbg_dp(ctrl->drm_dev, "%s: test->0x%x\n",
1618                 success ? "success" : "failed", pattern_requested);
1619         return success;
1620 }
1621
1622 void dp_ctrl_handle_sink_request(struct dp_ctrl *dp_ctrl)
1623 {
1624         struct dp_ctrl_private *ctrl;
1625         u32 sink_request = 0x0;
1626
1627         if (!dp_ctrl) {
1628                 DRM_ERROR("invalid input\n");
1629                 return;
1630         }
1631
1632         ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1633         sink_request = ctrl->link->sink_request;
1634
1635         if (sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) {
1636                 drm_dbg_dp(ctrl->drm_dev, "PHY_TEST_PATTERN request\n");
1637                 if (dp_ctrl_process_phy_test_request(ctrl)) {
1638                         DRM_ERROR("process phy_test_req failed\n");
1639                         return;
1640                 }
1641         }
1642
1643         if (sink_request & DP_LINK_STATUS_UPDATED) {
1644                 if (dp_ctrl_link_maintenance(ctrl)) {
1645                         DRM_ERROR("LM failed: TEST_LINK_TRAINING\n");
1646                         return;
1647                 }
1648         }
1649
1650         if (sink_request & DP_TEST_LINK_TRAINING) {
1651                 dp_link_send_test_response(ctrl->link);
1652                 if (dp_ctrl_link_maintenance(ctrl)) {
1653                         DRM_ERROR("LM failed: TEST_LINK_TRAINING\n");
1654                         return;
1655                 }
1656         }
1657 }
1658
1659 static bool dp_ctrl_clock_recovery_any_ok(
1660                         const u8 link_status[DP_LINK_STATUS_SIZE],
1661                         int lane_count)
1662 {
1663         int reduced_cnt;
1664
1665         if (lane_count <= 1)
1666                 return false;
1667
1668         /*
1669          * only interested in the lane number after reduced
1670          * lane_count = 4, then only interested in 2 lanes
1671          * lane_count = 2, then only interested in 1 lane
1672          */
1673         reduced_cnt = lane_count >> 1;
1674
1675         return drm_dp_clock_recovery_ok(link_status, reduced_cnt);
1676 }
1677
1678 static bool dp_ctrl_channel_eq_ok(struct dp_ctrl_private *ctrl)
1679 {
1680         u8 link_status[DP_LINK_STATUS_SIZE];
1681         int num_lanes = ctrl->link->link_params.num_lanes;
1682
1683         dp_ctrl_read_link_status(ctrl, link_status);
1684
1685         return drm_dp_channel_eq_ok(link_status, num_lanes);
1686 }
1687
1688 int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl)
1689 {
1690         int rc = 0;
1691         struct dp_ctrl_private *ctrl;
1692         u32 rate = 0;
1693         int link_train_max_retries = 5;
1694         u32 const phy_cts_pixel_clk_khz = 148500;
1695         u8 link_status[DP_LINK_STATUS_SIZE];
1696         unsigned int training_step;
1697
1698         if (!dp_ctrl)
1699                 return -EINVAL;
1700
1701         ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1702
1703         rate = ctrl->panel->link_info.rate;
1704
1705         dp_power_clk_enable(ctrl->power, DP_CORE_PM, true);
1706
1707         if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) {
1708                 drm_dbg_dp(ctrl->drm_dev,
1709                                 "using phy test link parameters\n");
1710                 if (!ctrl->panel->dp_mode.drm_mode.clock)
1711                         ctrl->dp_ctrl.pixel_rate = phy_cts_pixel_clk_khz;
1712         } else {
1713                 ctrl->link->link_params.rate = rate;
1714                 ctrl->link->link_params.num_lanes =
1715                         ctrl->panel->link_info.num_lanes;
1716                 ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
1717         }
1718
1719         drm_dbg_dp(ctrl->drm_dev, "rate=%d, num_lanes=%d, pixel_rate=%d\n",
1720                 ctrl->link->link_params.rate, ctrl->link->link_params.num_lanes,
1721                 ctrl->dp_ctrl.pixel_rate);
1722
1723
1724         rc = dp_ctrl_enable_mainlink_clocks(ctrl);
1725         if (rc)
1726                 return rc;
1727
1728         while (--link_train_max_retries) {
1729                 rc = dp_ctrl_reinitialize_mainlink(ctrl);
1730                 if (rc) {
1731                         DRM_ERROR("Failed to reinitialize mainlink. rc=%d\n",
1732                                         rc);
1733                         break;
1734                 }
1735
1736                 training_step = DP_TRAINING_NONE;
1737                 rc = dp_ctrl_setup_main_link(ctrl, &training_step);
1738                 if (rc == 0) {
1739                         /* training completed successfully */
1740                         break;
1741                 } else if (training_step == DP_TRAINING_1) {
1742                         /* link train_1 failed */
1743                         if (!dp_catalog_link_is_connected(ctrl->catalog))
1744                                 break;
1745
1746                         dp_ctrl_read_link_status(ctrl, link_status);
1747
1748                         rc = dp_ctrl_link_rate_down_shift(ctrl);
1749                         if (rc < 0) { /* already in RBR = 1.6G */
1750                                 if (dp_ctrl_clock_recovery_any_ok(link_status,
1751                                         ctrl->link->link_params.num_lanes)) {
1752                                         /*
1753                                          * some lanes are ready,
1754                                          * reduce lane number
1755                                          */
1756                                         rc = dp_ctrl_link_lane_down_shift(ctrl);
1757                                         if (rc < 0) { /* lane == 1 already */
1758                                                 /* end with failure */
1759                                                 break;
1760                                         }
1761                                 } else {
1762                                         /* end with failure */
1763                                         break; /* lane == 1 already */
1764                                 }
1765                         }
1766                 } else if (training_step == DP_TRAINING_2) {
1767                         /* link train_2 failed */
1768                         if (!dp_catalog_link_is_connected(ctrl->catalog))
1769                                 break;
1770
1771                         dp_ctrl_read_link_status(ctrl, link_status);
1772
1773                         if (!drm_dp_clock_recovery_ok(link_status,
1774                                         ctrl->link->link_params.num_lanes))
1775                                 rc = dp_ctrl_link_rate_down_shift(ctrl);
1776                         else
1777                                 rc = dp_ctrl_link_lane_down_shift(ctrl);
1778
1779                         if (rc < 0) {
1780                                 /* end with failure */
1781                                 break; /* lane == 1 already */
1782                         }
1783
1784                         /* stop link training before start re training  */
1785                         dp_ctrl_clear_training_pattern(ctrl);
1786                 }
1787         }
1788
1789         if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN)
1790                 return rc;
1791
1792         if (rc == 0) {  /* link train successfully */
1793                 /*
1794                  * do not stop train pattern here
1795                  * stop link training at on_stream
1796                  * to pass compliance test
1797                  */
1798         } else  {
1799                 /*
1800                  * link training failed
1801                  * end txing train pattern here
1802                  */
1803                 dp_ctrl_clear_training_pattern(ctrl);
1804
1805                 dp_ctrl_deinitialize_mainlink(ctrl);
1806                 rc = -ECONNRESET;
1807         }
1808
1809         return rc;
1810 }
1811
1812 static int dp_ctrl_link_retrain(struct dp_ctrl_private *ctrl)
1813 {
1814         int training_step = DP_TRAINING_NONE;
1815
1816         return dp_ctrl_setup_main_link(ctrl, &training_step);
1817 }
1818
1819 static int dp_ctrl_on_stream_phy_test_report(struct dp_ctrl *dp_ctrl)
1820 {
1821         int ret;
1822         struct dp_ctrl_private *ctrl;
1823
1824         ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1825
1826         ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
1827
1828         ret = dp_ctrl_enable_stream_clocks(ctrl);
1829         if (ret) {
1830                 DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret);
1831                 return ret;
1832         }
1833
1834         dp_ctrl_send_phy_test_pattern(ctrl);
1835
1836         return 0;
1837 }
1838
1839 int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl, bool force_link_train)
1840 {
1841         int ret = 0;
1842         bool mainlink_ready = false;
1843         struct dp_ctrl_private *ctrl;
1844         unsigned long pixel_rate_orig;
1845
1846         if (!dp_ctrl)
1847                 return -EINVAL;
1848
1849         ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1850
1851         ctrl->dp_ctrl.pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
1852
1853         pixel_rate_orig = ctrl->dp_ctrl.pixel_rate;
1854         if (dp_ctrl->wide_bus_en)
1855                 ctrl->dp_ctrl.pixel_rate >>= 1;
1856
1857         drm_dbg_dp(ctrl->drm_dev, "rate=%d, num_lanes=%d, pixel_rate=%d\n",
1858                 ctrl->link->link_params.rate,
1859                 ctrl->link->link_params.num_lanes, ctrl->dp_ctrl.pixel_rate);
1860
1861         if (!dp_power_clk_status(ctrl->power, DP_CTRL_PM)) { /* link clk is off */
1862                 ret = dp_ctrl_enable_mainlink_clocks(ctrl);
1863                 if (ret) {
1864                         DRM_ERROR("Failed to start link clocks. ret=%d\n", ret);
1865                         goto end;
1866                 }
1867         }
1868
1869         ret = dp_ctrl_enable_stream_clocks(ctrl);
1870         if (ret) {
1871                 DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret);
1872                 goto end;
1873         }
1874
1875         if (force_link_train || !dp_ctrl_channel_eq_ok(ctrl))
1876                 dp_ctrl_link_retrain(ctrl);
1877
1878         /* stop txing train pattern to end link training */
1879         dp_ctrl_clear_training_pattern(ctrl);
1880
1881         /*
1882          * Set up transfer unit values and set controller state to send
1883          * video.
1884          */
1885         reinit_completion(&ctrl->video_comp);
1886
1887         dp_ctrl_configure_source_params(ctrl);
1888
1889         dp_catalog_ctrl_config_msa(ctrl->catalog,
1890                 ctrl->link->link_params.rate,
1891                 pixel_rate_orig, dp_ctrl_use_fixed_nvid(ctrl));
1892
1893         dp_ctrl_setup_tr_unit(ctrl);
1894
1895         dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO);
1896
1897         ret = dp_ctrl_wait4video_ready(ctrl);
1898         if (ret)
1899                 return ret;
1900
1901         mainlink_ready = dp_catalog_ctrl_mainlink_ready(ctrl->catalog);
1902         drm_dbg_dp(ctrl->drm_dev,
1903                 "mainlink %s\n", mainlink_ready ? "READY" : "NOT READY");
1904
1905 end:
1906         return ret;
1907 }
1908
1909 int dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl)
1910 {
1911         struct dp_ctrl_private *ctrl;
1912         struct dp_io *dp_io;
1913         struct phy *phy;
1914         int ret;
1915
1916         ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1917         dp_io = &ctrl->parser->io;
1918         phy = dp_io->phy;
1919
1920         /* set dongle to D3 (power off) mode */
1921         dp_link_psm_config(ctrl->link, &ctrl->panel->link_info, true);
1922
1923         dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
1924
1925         if (dp_power_clk_status(ctrl->power, DP_STREAM_PM)) {
1926                 ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, false);
1927                 if (ret) {
1928                         DRM_ERROR("Failed to disable pclk. ret=%d\n", ret);
1929                         return ret;
1930                 }
1931         }
1932
1933         dev_pm_opp_set_rate(ctrl->dev, 0);
1934         ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
1935         if (ret) {
1936                 DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
1937                 return ret;
1938         }
1939
1940         phy_power_off(phy);
1941
1942         /* aux channel down, reinit phy */
1943         phy_exit(phy);
1944         phy_init(phy);
1945
1946         drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
1947                         phy, phy->init_count, phy->power_count);
1948         return ret;
1949 }
1950
1951 int dp_ctrl_off_link(struct dp_ctrl *dp_ctrl)
1952 {
1953         struct dp_ctrl_private *ctrl;
1954         struct dp_io *dp_io;
1955         struct phy *phy;
1956         int ret;
1957
1958         ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1959         dp_io = &ctrl->parser->io;
1960         phy = dp_io->phy;
1961
1962         dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
1963
1964         ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
1965         if (ret) {
1966                 DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
1967         }
1968
1969         DRM_DEBUG_DP("Before, phy=%p init_count=%d power_on=%d\n",
1970                 phy, phy->init_count, phy->power_count);
1971
1972         phy_power_off(phy);
1973
1974         DRM_DEBUG_DP("After, phy=%p init_count=%d power_on=%d\n",
1975                 phy, phy->init_count, phy->power_count);
1976
1977         return ret;
1978 }
1979
1980 int dp_ctrl_off(struct dp_ctrl *dp_ctrl)
1981 {
1982         struct dp_ctrl_private *ctrl;
1983         struct dp_io *dp_io;
1984         struct phy *phy;
1985         int ret = 0;
1986
1987         if (!dp_ctrl)
1988                 return -EINVAL;
1989
1990         ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1991         dp_io = &ctrl->parser->io;
1992         phy = dp_io->phy;
1993
1994         dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
1995
1996         dp_catalog_ctrl_reset(ctrl->catalog);
1997
1998         ret = dp_power_clk_enable(ctrl->power, DP_STREAM_PM, false);
1999         if (ret)
2000                 DRM_ERROR("Failed to disable pixel clocks. ret=%d\n", ret);
2001
2002         dev_pm_opp_set_rate(ctrl->dev, 0);
2003         ret = dp_power_clk_enable(ctrl->power, DP_CTRL_PM, false);
2004         if (ret) {
2005                 DRM_ERROR("Failed to disable link clocks. ret=%d\n", ret);
2006         }
2007
2008         phy_power_off(phy);
2009         drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
2010                         phy, phy->init_count, phy->power_count);
2011
2012         return ret;
2013 }
2014
2015 void dp_ctrl_isr(struct dp_ctrl *dp_ctrl)
2016 {
2017         struct dp_ctrl_private *ctrl;
2018         u32 isr;
2019
2020         if (!dp_ctrl)
2021                 return;
2022
2023         ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
2024
2025         isr = dp_catalog_ctrl_get_interrupt(ctrl->catalog);
2026
2027         if (isr & DP_CTRL_INTR_READY_FOR_VIDEO) {
2028                 drm_dbg_dp(ctrl->drm_dev, "dp_video_ready\n");
2029                 complete(&ctrl->video_comp);
2030         }
2031
2032         if (isr & DP_CTRL_INTR_IDLE_PATTERN_SENT) {
2033                 drm_dbg_dp(ctrl->drm_dev, "idle_patterns_sent\n");
2034                 complete(&ctrl->idle_comp);
2035         }
2036 }
2037
2038 struct dp_ctrl *dp_ctrl_get(struct device *dev, struct dp_link *link,
2039                         struct dp_panel *panel, struct drm_dp_aux *aux,
2040                         struct dp_power *power, struct dp_catalog *catalog,
2041                         struct dp_parser *parser)
2042 {
2043         struct dp_ctrl_private *ctrl;
2044         int ret;
2045
2046         if (!dev || !panel || !aux ||
2047             !link || !catalog) {
2048                 DRM_ERROR("invalid input\n");
2049                 return ERR_PTR(-EINVAL);
2050         }
2051
2052         ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
2053         if (!ctrl) {
2054                 DRM_ERROR("Mem allocation failure\n");
2055                 return ERR_PTR(-ENOMEM);
2056         }
2057
2058         ret = devm_pm_opp_set_clkname(dev, "ctrl_link");
2059         if (ret) {
2060                 dev_err(dev, "invalid DP OPP table in device tree\n");
2061                 /* caller do PTR_ERR(opp_table) */
2062                 return (struct dp_ctrl *)ERR_PTR(ret);
2063         }
2064
2065         /* OPP table is optional */
2066         ret = devm_pm_opp_of_add_table(dev);
2067         if (ret)
2068                 dev_err(dev, "failed to add DP OPP table\n");
2069
2070         init_completion(&ctrl->idle_comp);
2071         init_completion(&ctrl->video_comp);
2072
2073         /* in parameters */
2074         ctrl->parser   = parser;
2075         ctrl->panel    = panel;
2076         ctrl->power    = power;
2077         ctrl->aux      = aux;
2078         ctrl->link     = link;
2079         ctrl->catalog  = catalog;
2080         ctrl->dev      = dev;
2081
2082         return &ctrl->dp_ctrl;
2083 }