drivers/gpu/drm/bridge/tc358767.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * tc358767 eDP bridge driver
   4  *
   5  * Copyright (C) 2016 CogentEmbedded Inc
   6  * Author: Andrey Gusakov <[email protected]>
   7  *
   8  * Copyright (C) 2016 Pengutronix, Philipp Zabel <[email protected]>
   9  *
  10  * Copyright (C) 2016 Zodiac Inflight Innovations
  11  *
  12  * Initially based on: drivers/gpu/drm/i2c/tda998x_drv.c
  13  *
  14  * Copyright (C) 2012 Texas Instruments
  15  * Author: Rob Clark <[email protected]>
  16  */
  17
  18 #include <linux/bitfield.h>
  19 #include <linux/clk.h>
  20 #include <linux/device.h>
  21 #include <linux/gpio/consumer.h>
  22 #include <linux/i2c.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/regmap.h>
  26 #include <linux/slab.h>
  27
  28 #include <drm/drm_atomic_helper.h>
  29 #include <drm/drm_dp_helper.h>
  30 #include <drm/drm_edid.h>
  31 #include <drm/drm_of.h>
  32 #include <drm/drm_panel.h>
  33 #include <drm/drm_probe_helper.h>
  34
  35 /* Registers */
  36
  37 /* Display Parallel Interface */
  38 #define DPIPXLFMT               0x0440
  39 #define VS_POL_ACTIVE_LOW               (1 << 10)
  40 #define HS_POL_ACTIVE_LOW               (1 << 9)
  41 #define DE_POL_ACTIVE_HIGH              (0 << 8)
  42 #define SUB_CFG_TYPE_CONFIG1            (0 << 2) /* LSB aligned */
  43 #define SUB_CFG_TYPE_CONFIG2            (1 << 2) /* Loosely Packed */
  44 #define SUB_CFG_TYPE_CONFIG3            (2 << 2) /* LSB aligned 8-bit */
  45 #define DPI_BPP_RGB888                  (0 << 0)
  46 #define DPI_BPP_RGB666                  (1 << 0)
  47 #define DPI_BPP_RGB565                  (2 << 0)
  48
  49 /* Video Path */
  50 #define VPCTRL0                 0x0450
  51 #define VSDELAY                 GENMASK(31, 20)
  52 #define OPXLFMT_RGB666                  (0 << 8)
  53 #define OPXLFMT_RGB888                  (1 << 8)
  54 #define FRMSYNC_DISABLED                (0 << 4) /* Video Timing Gen Disabled */
  55 #define FRMSYNC_ENABLED                 (1 << 4) /* Video Timing Gen Enabled */
  56 #define MSF_DISABLED                    (0 << 0) /* Magic Square FRC disabled */
  57 #define MSF_ENABLED                     (1 << 0) /* Magic Square FRC enabled */
  58 #define HTIM01                  0x0454
  59 #define HPW                     GENMASK(8, 0)
  60 #define HBPR                    GENMASK(24, 16)
  61 #define HTIM02                  0x0458
  62 #define HDISPR                  GENMASK(10, 0)
  63 #define HFPR                    GENMASK(24, 16)
  64 #define VTIM01                  0x045c
  65 #define VSPR                    GENMASK(7, 0)
  66 #define VBPR                    GENMASK(23, 16)
  67 #define VTIM02                  0x0460
  68 #define VFPR                    GENMASK(23, 16)
  69 #define VDISPR                  GENMASK(10, 0)
  70 #define VFUEN0                  0x0464
  71 #define VFUEN                           BIT(0)   /* Video Frame Timing Upload */
  72
  73 /* System */
  74 #define TC_IDREG                0x0500
  75 #define SYSSTAT                 0x0508
  76 #define SYSCTRL                 0x0510
  77 #define DP0_AUDSRC_NO_INPUT             (0 << 3)
  78 #define DP0_AUDSRC_I2S_RX               (1 << 3)
  79 #define DP0_VIDSRC_NO_INPUT             (0 << 0)
  80 #define DP0_VIDSRC_DSI_RX               (1 << 0)
  81 #define DP0_VIDSRC_DPI_RX               (2 << 0)
  82 #define DP0_VIDSRC_COLOR_BAR            (3 << 0)
  83 #define SYSRSTENB               0x050c
  84 #define ENBI2C                          (1 << 0)
  85 #define ENBLCD0                         (1 << 2)
  86 #define ENBBM                           (1 << 3)
  87 #define ENBDSIRX                        (1 << 4)
  88 #define ENBREG                          (1 << 5)
  89 #define ENBHDCP                         (1 << 8)
  90 #define GPIOM                   0x0540
  91 #define GPIOC                   0x0544
  92 #define GPIOO                   0x0548
  93 #define GPIOI                   0x054c
  94 #define INTCTL_G                0x0560
  95 #define INTSTS_G                0x0564
  96
  97 #define INT_SYSERR              BIT(16)
  98 #define INT_GPIO_H(x)           (1 << (x == 0 ? 2 : 10))
  99 #define INT_GPIO_LC(x)          (1 << (x == 0 ? 3 : 11))
 100
 101 #define INT_GP0_LCNT            0x0584
 102 #define INT_GP1_LCNT            0x0588
 103
 104 /* Control */
 105 #define DP0CTL                  0x0600
 106 #define VID_MN_GEN                      BIT(6)   /* Auto-generate M/N values */
 107 #define EF_EN                           BIT(5)   /* Enable Enhanced Framing */
 108 #define VID_EN                          BIT(1)   /* Video transmission enable */
 109 #define DP_EN                           BIT(0)   /* Enable DPTX function */
 110
 111 /* Clocks */
 112 #define DP0_VIDMNGEN0           0x0610
 113 #define DP0_VIDMNGEN1           0x0614
 114 #define DP0_VMNGENSTATUS        0x0618
 115
 116 /* Main Channel */
 117 #define DP0_SECSAMPLE           0x0640
 118 #define DP0_VIDSYNCDELAY        0x0644
 119 #define VID_SYNC_DLY            GENMASK(15, 0)
 120 #define THRESH_DLY              GENMASK(31, 16)
 121
 122 #define DP0_TOTALVAL            0x0648
 123 #define H_TOTAL                 GENMASK(15, 0)
 124 #define V_TOTAL                 GENMASK(31, 16)
 125 #define DP0_STARTVAL            0x064c
 126 #define H_START                 GENMASK(15, 0)
 127 #define V_START                 GENMASK(31, 16)
 128 #define DP0_ACTIVEVAL           0x0650
 129 #define H_ACT                   GENMASK(15, 0)
 130 #define V_ACT                   GENMASK(31, 16)
 131
 132 #define DP0_SYNCVAL             0x0654
 133 #define VS_WIDTH                GENMASK(30, 16)
 134 #define HS_WIDTH                GENMASK(14, 0)
 135 #define SYNCVAL_HS_POL_ACTIVE_LOW       (1 << 15)
 136 #define SYNCVAL_VS_POL_ACTIVE_LOW       (1 << 31)
 137 #define DP0_MISC                0x0658
 138 #define TU_SIZE_RECOMMENDED             (63) /* LSCLK cycles per TU */
 139 #define MAX_TU_SYMBOL           GENMASK(28, 23)
 140 #define TU_SIZE                 GENMASK(21, 16)
 141 #define BPC_6                           (0 << 5)
 142 #define BPC_8                           (1 << 5)
 143
 144 /* AUX channel */
 145 #define DP0_AUXCFG0             0x0660
 146 #define DP0_AUXCFG0_BSIZE       GENMASK(11, 8)
 147 #define DP0_AUXCFG0_ADDR_ONLY   BIT(4)
 148 #define DP0_AUXCFG1             0x0664
 149 #define AUX_RX_FILTER_EN                BIT(16)
 150
 151 #define DP0_AUXADDR             0x0668
 152 #define DP0_AUXWDATA(i)         (0x066c + (i) * 4)
 153 #define DP0_AUXRDATA(i)         (0x067c + (i) * 4)
 154 #define DP0_AUXSTATUS           0x068c
 155 #define AUX_BYTES               GENMASK(15, 8)
 156 #define AUX_STATUS              GENMASK(7, 4)
 157 #define AUX_TIMEOUT             BIT(1)
 158 #define AUX_BUSY                BIT(0)
 159 #define DP0_AUXI2CADR           0x0698
 160
 161 /* Link Training */
 162 #define DP0_SRCCTRL             0x06a0
 163 #define DP0_SRCCTRL_SCRMBLDIS           BIT(13)
 164 #define DP0_SRCCTRL_EN810B              BIT(12)
 165 #define DP0_SRCCTRL_NOTP                (0 << 8)
 166 #define DP0_SRCCTRL_TP1                 (1 << 8)
 167 #define DP0_SRCCTRL_TP2                 (2 << 8)
 168 #define DP0_SRCCTRL_LANESKEW            BIT(7)
 169 #define DP0_SRCCTRL_SSCG                BIT(3)
 170 #define DP0_SRCCTRL_LANES_1             (0 << 2)
 171 #define DP0_SRCCTRL_LANES_2             (1 << 2)
 172 #define DP0_SRCCTRL_BW27                (1 << 1)
 173 #define DP0_SRCCTRL_BW162               (0 << 1)
 174 #define DP0_SRCCTRL_AUTOCORRECT         BIT(0)
 175 #define DP0_LTSTAT              0x06d0
 176 #define LT_LOOPDONE                     BIT(13)
 177 #define LT_STATUS_MASK                  (0x1f << 8)
 178 #define LT_CHANNEL1_EQ_BITS             (DP_CHANNEL_EQ_BITS << 4)
 179 #define LT_INTERLANE_ALIGN_DONE         BIT(3)
 180 #define LT_CHANNEL0_EQ_BITS             (DP_CHANNEL_EQ_BITS)
 181 #define DP0_SNKLTCHGREQ         0x06d4
 182 #define DP0_LTLOOPCTRL          0x06d8
 183 #define DP0_SNKLTCTRL           0x06e4
 184
 185 #define DP1_SRCCTRL             0x07a0
 186
 187 /* PHY */
 188 #define DP_PHY_CTRL             0x0800
 189 #define DP_PHY_RST                      BIT(28)  /* DP PHY Global Soft Reset */
 190 #define BGREN                           BIT(25)  /* AUX PHY BGR Enable */
 191 #define PWR_SW_EN                       BIT(24)  /* PHY Power Switch Enable */
 192 #define PHY_M1_RST                      BIT(12)  /* Reset PHY1 Main Channel */
 193 #define PHY_RDY                         BIT(16)  /* PHY Main Channels Ready */
 194 #define PHY_M0_RST                      BIT(8)   /* Reset PHY0 Main Channel */
 195 #define PHY_2LANE                       BIT(2)   /* PHY Enable 2 lanes */
 196 #define PHY_A0_EN                       BIT(1)   /* PHY Aux Channel0 Enable */
 197 #define PHY_M0_EN                       BIT(0)   /* PHY Main Channel0 Enable */
 198
 199 /* PLL */
 200 #define DP0_PLLCTRL             0x0900
 201 #define DP1_PLLCTRL             0x0904  /* not defined in DS */
 202 #define PXL_PLLCTRL             0x0908
 203 #define PLLUPDATE                       BIT(2)
 204 #define PLLBYP                          BIT(1)
 205 #define PLLEN                           BIT(0)
 206 #define PXL_PLLPARAM            0x0914
 207 #define IN_SEL_REFCLK                   (0 << 14)
 208 #define SYS_PLLPARAM            0x0918
 209 #define REF_FREQ_38M4                   (0 << 8) /* 38.4 MHz */
 210 #define REF_FREQ_19M2                   (1 << 8) /* 19.2 MHz */
 211 #define REF_FREQ_26M                    (2 << 8) /* 26 MHz */
 212 #define REF_FREQ_13M                    (3 << 8) /* 13 MHz */
 213 #define SYSCLK_SEL_LSCLK                (0 << 4)
 214 #define LSCLK_DIV_1                     (0 << 0)
 215 #define LSCLK_DIV_2                     (1 << 0)
 216
 217 /* Test & Debug */
 218 #define TSTCTL                  0x0a00
 219 #define COLOR_R                 GENMASK(31, 24)
 220 #define COLOR_G                 GENMASK(23, 16)
 221 #define COLOR_B                 GENMASK(15, 8)
 222 #define ENI2CFILTER             BIT(4)
 223 #define COLOR_BAR_MODE          GENMASK(1, 0)
 224 #define COLOR_BAR_MODE_BARS     2
 225 #define PLL_DBG                 0x0a04
 226
 227 static bool tc_test_pattern;
 228 module_param_named(test, tc_test_pattern, bool, 0644);
 229
 230 struct tc_edp_link {
 231         struct drm_dp_link      base;
 232         u8                      assr;
 233         bool                    scrambler_dis;
 234         bool                    spread;
 235 };
 236
 237 struct tc_data {
 238         struct device           *dev;
 239         struct regmap           *regmap;
 240         struct drm_dp_aux       aux;
 241
 242         struct drm_bridge       bridge;
 243         struct drm_connector    connector;
 244         struct drm_panel        *panel;
 245
 246         /* link settings */
 247         struct tc_edp_link      link;
 248
 249         /* display edid */
 250         struct edid             *edid;
 251         /* current mode */
 252         struct drm_display_mode mode;
 253
 254         u32                     rev;
 255         u8                      assr;
 256
 257         struct gpio_desc        *sd_gpio;
 258         struct gpio_desc        *reset_gpio;
 259         struct clk              *refclk;
 260
 261         /* do we have IRQ */
 262         bool                    have_irq;
 263
 264         /* HPD pin number (0 or 1) or -ENODEV */
 265         int                     hpd_pin;
 266 };
 267
 268 static inline struct tc_data *aux_to_tc(struct drm_dp_aux *a)
 269 {
 270         return container_of(a, struct tc_data, aux);
 271 }
 272
 273 static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
 274 {
 275         return container_of(b, struct tc_data, bridge);
 276 }
 277
 278 static inline struct tc_data *connector_to_tc(struct drm_connector *c)
 279 {
 280         return container_of(c, struct tc_data, connector);
 281 }
 282
 283 static inline int tc_poll_timeout(struct tc_data *tc, unsigned int addr,
 284                                   unsigned int cond_mask,
 285                                   unsigned int cond_value,
 286                                   unsigned long sleep_us, u64 timeout_us)
 287 {
 288         unsigned int val;
 289
 290         return regmap_read_poll_timeout(tc->regmap, addr, val,
 291                                         (val & cond_mask) == cond_value,
 292                                         sleep_us, timeout_us);
 293 }
 294
 295 static int tc_aux_wait_busy(struct tc_data *tc)
 296 {
 297         return tc_poll_timeout(tc, DP0_AUXSTATUS, AUX_BUSY, 0, 1000, 100000);
 298 }
 299
 300 static int tc_aux_write_data(struct tc_data *tc, const void *data,
 301                              size_t size)
 302 {
 303         u32 auxwdata[DP_AUX_MAX_PAYLOAD_BYTES / sizeof(u32)] = { 0 };
 304         int ret, count = ALIGN(size, sizeof(u32));
 305
 306         memcpy(auxwdata, data, size);
 307
 308         ret = regmap_raw_write(tc->regmap, DP0_AUXWDATA(0), auxwdata, count);
 309         if (ret)
 310                 return ret;
 311
 312         return size;
 313 }
 314
 315 static int tc_aux_read_data(struct tc_data *tc, void *data, size_t size)
 316 {
 317         u32 auxrdata[DP_AUX_MAX_PAYLOAD_BYTES / sizeof(u32)];
 318         int ret, count = ALIGN(size, sizeof(u32));
 319
 320         ret = regmap_raw_read(tc->regmap, DP0_AUXRDATA(0), auxrdata, count);
 321         if (ret)
 322                 return ret;
 323
 324         memcpy(data, auxrdata, size);
 325
 326         return size;
 327 }
 328
 329 static u32 tc_auxcfg0(struct drm_dp_aux_msg *msg, size_t size)
 330 {
 331         u32 auxcfg0 = msg->request;
 332
 333         if (size)
 334                 auxcfg0 |= FIELD_PREP(DP0_AUXCFG0_BSIZE, size - 1);
 335         else
 336                 auxcfg0 |= DP0_AUXCFG0_ADDR_ONLY;
 337
 338         return auxcfg0;
 339 }
 340
 341 static ssize_t tc_aux_transfer(struct drm_dp_aux *aux,
 342                                struct drm_dp_aux_msg *msg)
 343 {
 344         struct tc_data *tc = aux_to_tc(aux);
 345         size_t size = min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES - 1, msg->size);
 346         u8 request = msg->request & ~DP_AUX_I2C_MOT;
 347         u32 auxstatus;
 348         int ret;
 349
 350         ret = tc_aux_wait_busy(tc);
 351         if (ret)
 352                 return ret;
 353
 354         switch (request) {
 355         case DP_AUX_NATIVE_READ:
 356         case DP_AUX_I2C_READ:
 357                 break;
 358         case DP_AUX_NATIVE_WRITE:
 359         case DP_AUX_I2C_WRITE:
 360                 if (size) {
 361                         ret = tc_aux_write_data(tc, msg->buffer, size);
 362                         if (ret < 0)
 363                                 return ret;
 364                 }
 365                 break;
 366         default:
 367                 return -EINVAL;
 368         }
 369
 370         /* Store address */
 371         ret = regmap_write(tc->regmap, DP0_AUXADDR, msg->address);
 372         if (ret)
 373                 return ret;
 374         /* Start transfer */
 375         ret = regmap_write(tc->regmap, DP0_AUXCFG0, tc_auxcfg0(msg, size));
 376         if (ret)
 377                 return ret;
 378
 379         ret = tc_aux_wait_busy(tc);
 380         if (ret)
 381                 return ret;
 382
 383         ret = regmap_read(tc->regmap, DP0_AUXSTATUS, &auxstatus);
 384         if (ret)
 385                 return ret;
 386
 387         if (auxstatus & AUX_TIMEOUT)
 388                 return -ETIMEDOUT;
 389         /*
 390          * For some reason address-only DP_AUX_I2C_WRITE (MOT), still
 391          * reports 1 byte transferred in its status. To deal we that
 392          * we ignore aux_bytes field if we know that this was an
 393          * address-only transfer
 394          */
 395         if (size)
 396                 size = FIELD_GET(AUX_BYTES, auxstatus);
 397         msg->reply = FIELD_GET(AUX_STATUS, auxstatus);
 398
 399         switch (request) {
 400         case DP_AUX_NATIVE_READ:
 401         case DP_AUX_I2C_READ:
 402                 if (size)
 403                         return tc_aux_read_data(tc, msg->buffer, size);
 404                 break;
 405         }
 406
 407         return size;
 408 }
 409
 410 static const char * const training_pattern1_errors[] = {
 411         "No errors",
 412         "Aux write error",
 413         "Aux read error",
 414         "Max voltage reached error",
 415         "Loop counter expired error",
 416         "res", "res", "res"
 417 };
 418
 419 static const char * const training_pattern2_errors[] = {
 420         "No errors",
 421         "Aux write error",
 422         "Aux read error",
 423         "Clock recovery failed error",
 424         "Loop counter expired error",
 425         "res", "res", "res"
 426 };
 427
 428 static u32 tc_srcctrl(struct tc_data *tc)
 429 {
 430         /*
 431          * No training pattern, skew lane 1 data by two LSCLK cycles with
 432          * respect to lane 0 data, AutoCorrect Mode = 0
 433          */
 434         u32 reg = DP0_SRCCTRL_NOTP | DP0_SRCCTRL_LANESKEW | DP0_SRCCTRL_EN810B;
 435
 436         if (tc->link.scrambler_dis)
 437                 reg |= DP0_SRCCTRL_SCRMBLDIS;   /* Scrambler Disabled */
 438         if (tc->link.spread)
 439                 reg |= DP0_SRCCTRL_SSCG;        /* Spread Spectrum Enable */
 440         if (tc->link.base.num_lanes == 2)
 441                 reg |= DP0_SRCCTRL_LANES_2;     /* Two Main Channel Lanes */
 442         if (tc->link.base.rate != 162000)
 443                 reg |= DP0_SRCCTRL_BW27;        /* 2.7 Gbps link */
 444         return reg;
 445 }
 446
 447 static int tc_pllupdate(struct tc_data *tc, unsigned int pllctrl)
 448 {
 449         int ret;
 450
 451         ret = regmap_write(tc->regmap, pllctrl, PLLUPDATE | PLLEN);
 452         if (ret)
 453                 return ret;
 454
 455         /* Wait for PLL to lock: up to 2.09 ms, depending on refclk */
 456         usleep_range(3000, 6000);
 457
 458         return 0;
 459 }
 460
 461 static int tc_pxl_pll_en(struct tc_data *tc, u32 refclk, u32 pixelclock)
 462 {
 463         int ret;
 464         int i_pre, best_pre = 1;
 465         int i_post, best_post = 1;
 466         int div, best_div = 1;
 467         int mul, best_mul = 1;
 468         int delta, best_delta;
 469         int ext_div[] = {1, 2, 3, 5, 7};
 470         int best_pixelclock = 0;
 471         int vco_hi = 0;
 472         u32 pxl_pllparam;
 473
 474         dev_dbg(tc->dev, "PLL: requested %d pixelclock, ref %d\n", pixelclock,
 475                 refclk);
 476         best_delta = pixelclock;
 477         /* Loop over all possible ext_divs, skipping invalid configurations */
 478         for (i_pre = 0; i_pre < ARRAY_SIZE(ext_div); i_pre++) {
 479                 /*
 480                  * refclk / ext_pre_div should be in the 1 to 200 MHz range.
 481                  * We don't allow any refclk > 200 MHz, only check lower bounds.
 482                  */
 483                 if (refclk / ext_div[i_pre] < 1000000)
 484                         continue;
 485                 for (i_post = 0; i_post < ARRAY_SIZE(ext_div); i_post++) {
 486                         for (div = 1; div <= 16; div++) {
 487                                 u32 clk;
 488                                 u64 tmp;
 489
 490                                 tmp = pixelclock * ext_div[i_pre] *
 491                                       ext_div[i_post] * div;
 492                                 do_div(tmp, refclk);
 493                                 mul = tmp;
 494
 495                                 /* Check limits */
 496                                 if ((mul < 1) || (mul > 128))
 497                                         continue;
 498
 499                                 clk = (refclk / ext_div[i_pre] / div) * mul;
 500                                 /*
 501                                  * refclk * mul / (ext_pre_div * pre_div)
 502                                  * should be in the 150 to 650 MHz range
 503                                  */
 504                                 if ((clk > 650000000) || (clk < 150000000))
 505                                         continue;
 506
 507                                 clk = clk / ext_div[i_post];
 508                                 delta = clk - pixelclock;
 509
 510                                 if (abs(delta) < abs(best_delta)) {
 511                                         best_pre = i_pre;
 512                                         best_post = i_post;
 513                                         best_div = div;
 514                                         best_mul = mul;
 515                                         best_delta = delta;
 516                                         best_pixelclock = clk;
 517                                 }
 518                         }
 519                 }
 520         }
 521         if (best_pixelclock == 0) {
 522                 dev_err(tc->dev, "Failed to calc clock for %d pixelclock\n",
 523                         pixelclock);
 524                 return -EINVAL;
 525         }
 526
 527         dev_dbg(tc->dev, "PLL: got %d, delta %d\n", best_pixelclock,
 528                 best_delta);
 529         dev_dbg(tc->dev, "PLL: %d / %d / %d * %d / %d\n", refclk,
 530                 ext_div[best_pre], best_div, best_mul, ext_div[best_post]);
 531
 532         /* if VCO >= 300 MHz */
 533         if (refclk / ext_div[best_pre] / best_div * best_mul >= 300000000)
 534                 vco_hi = 1;
 535         /* see DS */
 536         if (best_div == 16)
 537                 best_div = 0;
 538         if (best_mul == 128)
 539                 best_mul = 0;
 540
 541         /* Power up PLL and switch to bypass */
 542         ret = regmap_write(tc->regmap, PXL_PLLCTRL, PLLBYP | PLLEN);
 543         if (ret)
 544                 return ret;
 545
 546         pxl_pllparam  = vco_hi << 24; /* For PLL VCO >= 300 MHz = 1 */
 547         pxl_pllparam |= ext_div[best_pre] << 20; /* External Pre-divider */
 548         pxl_pllparam |= ext_div[best_post] << 16; /* External Post-divider */
 549         pxl_pllparam |= IN_SEL_REFCLK; /* Use RefClk as PLL input */
 550         pxl_pllparam |= best_div << 8; /* Divider for PLL RefClk */
 551         pxl_pllparam |= best_mul; /* Multiplier for PLL */
 552
 553         ret = regmap_write(tc->regmap, PXL_PLLPARAM, pxl_pllparam);
 554         if (ret)
 555                 return ret;
 556
 557         /* Force PLL parameter update and disable bypass */
 558         return tc_pllupdate(tc, PXL_PLLCTRL);
 559 }
 560
 561 static int tc_pxl_pll_dis(struct tc_data *tc)
 562 {
 563         /* Enable PLL bypass, power down PLL */
 564         return regmap_write(tc->regmap, PXL_PLLCTRL, PLLBYP);
 565 }
 566
 567 static int tc_stream_clock_calc(struct tc_data *tc)
 568 {
 569         /*
 570          * If the Stream clock and Link Symbol clock are
 571          * asynchronous with each other, the value of M changes over
 572          * time. This way of generating link clock and stream
 573          * clock is called Asynchronous Clock mode. The value M
 574          * must change while the value N stays constant. The
 575          * value of N in this Asynchronous Clock mode must be set
 576          * to 2^15 or 32,768.
 577          *
 578          * LSCLK = 1/10 of high speed link clock
 579          *
 580          * f_STRMCLK = M/N * f_LSCLK
 581          * M/N = f_STRMCLK / f_LSCLK
 582          *
 583          */
 584         return regmap_write(tc->regmap, DP0_VIDMNGEN1, 32768);
 585 }
 586
 587 static int tc_set_syspllparam(struct tc_data *tc)
 588 {
 589         unsigned long rate;
 590         u32 pllparam = SYSCLK_SEL_LSCLK | LSCLK_DIV_2;
 591
 592         rate = clk_get_rate(tc->refclk);
 593         switch (rate) {
 594         case 38400000:
 595                 pllparam |= REF_FREQ_38M4;
 596                 break;
 597         case 26000000:
 598                 pllparam |= REF_FREQ_26M;
 599                 break;
 600         case 19200000:
 601                 pllparam |= REF_FREQ_19M2;
 602                 break;
 603         case 13000000:
 604                 pllparam |= REF_FREQ_13M;
 605                 break;
 606         default:
 607                 dev_err(tc->dev, "Invalid refclk rate: %lu Hz\n", rate);
 608                 return -EINVAL;
 609         }
 610
 611         return regmap_write(tc->regmap, SYS_PLLPARAM, pllparam);
 612 }
 613
 614 static int tc_aux_link_setup(struct tc_data *tc)
 615 {
 616         int ret;
 617         u32 dp0_auxcfg1;
 618
 619         /* Setup DP-PHY / PLL */
 620         ret = tc_set_syspllparam(tc);
 621         if (ret)
 622                 goto err;
 623
 624         ret = regmap_write(tc->regmap, DP_PHY_CTRL,
 625                            BGREN | PWR_SW_EN | PHY_A0_EN);
 626         if (ret)
 627                 goto err;
 628         /*
 629          * Initially PLLs are in bypass. Force PLL parameter update,
 630          * disable PLL bypass, enable PLL
 631          */
 632         ret = tc_pllupdate(tc, DP0_PLLCTRL);
 633         if (ret)
 634                 goto err;
 635
 636         ret = tc_pllupdate(tc, DP1_PLLCTRL);
 637         if (ret)
 638                 goto err;
 639
 640         ret = tc_poll_timeout(tc, DP_PHY_CTRL, PHY_RDY, PHY_RDY, 1, 1000);
 641         if (ret == -ETIMEDOUT) {
 642                 dev_err(tc->dev, "Timeout waiting for PHY to become ready");
 643                 return ret;
 644         } else if (ret) {
 645                 goto err;
 646         }
 647
 648         /* Setup AUX link */
 649         dp0_auxcfg1  = AUX_RX_FILTER_EN;
 650         dp0_auxcfg1 |= 0x06 << 8; /* Aux Bit Period Calculator Threshold */
 651         dp0_auxcfg1 |= 0x3f << 0; /* Aux Response Timeout Timer */
 652
 653         ret = regmap_write(tc->regmap, DP0_AUXCFG1, dp0_auxcfg1);
 654         if (ret)
 655                 goto err;
 656
 657         return 0;
 658 err:
 659         dev_err(tc->dev, "tc_aux_link_setup failed: %d\n", ret);
 660         return ret;
 661 }
 662
 663 static int tc_get_display_props(struct tc_data *tc)
 664 {
 665         int ret;
 666         u8 reg;
 667
 668         /* Read DP Rx Link Capability */
 669         ret = drm_dp_link_probe(&tc->aux, &tc->link.base);
 670         if (ret < 0)
 671                 goto err_dpcd_read;
 672         if (tc->link.base.rate != 162000 && tc->link.base.rate != 270000) {
 673                 dev_dbg(tc->dev, "Falling to 2.7 Gbps rate\n");
 674                 tc->link.base.rate = 270000;
 675         }
 676
 677         if (tc->link.base.num_lanes > 2) {
 678                 dev_dbg(tc->dev, "Falling to 2 lanes\n");
 679                 tc->link.base.num_lanes = 2;
 680         }
 681
 682         ret = drm_dp_dpcd_readb(&tc->aux, DP_MAX_DOWNSPREAD, &reg);
 683         if (ret < 0)
 684                 goto err_dpcd_read;
 685         tc->link.spread = reg & DP_MAX_DOWNSPREAD_0_5;
 686
 687         ret = drm_dp_dpcd_readb(&tc->aux, DP_MAIN_LINK_CHANNEL_CODING, &reg);
 688         if (ret < 0)
 689                 goto err_dpcd_read;
 690
 691         tc->link.scrambler_dis = false;
 692         /* read assr */
 693         ret = drm_dp_dpcd_readb(&tc->aux, DP_EDP_CONFIGURATION_SET, &reg);
 694         if (ret < 0)
 695                 goto err_dpcd_read;
 696         tc->link.assr = reg & DP_ALTERNATE_SCRAMBLER_RESET_ENABLE;
 697
 698         dev_dbg(tc->dev, "DPCD rev: %d.%d, rate: %s, lanes: %d, framing: %s\n",
 699                 tc->link.base.revision >> 4, tc->link.base.revision & 0x0f,
 700                 (tc->link.base.rate == 162000) ? "1.62Gbps" : "2.7Gbps",
 701                 tc->link.base.num_lanes,
 702                 (tc->link.base.capabilities & DP_LINK_CAP_ENHANCED_FRAMING) ?
 703                 "enhanced" : "non-enhanced");
 704         dev_dbg(tc->dev, "Downspread: %s, scrambler: %s\n",
 705                 tc->link.spread ? "0.5%" : "0.0%",
 706                 tc->link.scrambler_dis ? "disabled" : "enabled");
 707         dev_dbg(tc->dev, "Display ASSR: %d, TC358767 ASSR: %d\n",
 708                 tc->link.assr, tc->assr);
 709
 710         return 0;
 711
 712 err_dpcd_read:
 713         dev_err(tc->dev, "failed to read DPCD: %d\n", ret);
 714         return ret;
 715 }
 716
 717 static int tc_set_video_mode(struct tc_data *tc,
 718                              const struct drm_display_mode *mode)
 719 {
 720         int ret;
 721         int vid_sync_dly;
 722         int max_tu_symbol;
 723
 724         int left_margin = mode->htotal - mode->hsync_end;
 725         int right_margin = mode->hsync_start - mode->hdisplay;
 726         int hsync_len = mode->hsync_end - mode->hsync_start;
 727         int upper_margin = mode->vtotal - mode->vsync_end;
 728         int lower_margin = mode->vsync_start - mode->vdisplay;
 729         int vsync_len = mode->vsync_end - mode->vsync_start;
 730         u32 dp0_syncval;
 731
 732         /*
 733          * Recommended maximum number of symbols transferred in a transfer unit:
 734          * DIV_ROUND_UP((input active video bandwidth in bytes) * tu_size,
 735          *              (output active video bandwidth in bytes))
 736          * Must be less than tu_size.
 737          */
 738         max_tu_symbol = TU_SIZE_RECOMMENDED - 1;
 739
 740         dev_dbg(tc->dev, "set mode %dx%d\n",
 741                 mode->hdisplay, mode->vdisplay);
 742         dev_dbg(tc->dev, "H margin %d,%d sync %d\n",
 743                 left_margin, right_margin, hsync_len);
 744         dev_dbg(tc->dev, "V margin %d,%d sync %d\n",
 745                 upper_margin, lower_margin, vsync_len);
 746         dev_dbg(tc->dev, "total: %dx%d\n", mode->htotal, mode->vtotal);
 747
 748
 749         /*
 750          * LCD Ctl Frame Size
 751          * datasheet is not clear of vsdelay in case of DPI
 752          * assume we do not need any delay when DPI is a source of
 753          * sync signals
 754          */
 755         ret = regmap_write(tc->regmap, VPCTRL0,
 756                            FIELD_PREP(VSDELAY, 0) |
 757                            OPXLFMT_RGB888 | FRMSYNC_DISABLED | MSF_DISABLED);
 758         if (ret)
 759                 return ret;
 760
 761         ret = regmap_write(tc->regmap, HTIM01,
 762                            FIELD_PREP(HBPR, ALIGN(left_margin, 2)) |
 763                            FIELD_PREP(HPW, ALIGN(hsync_len, 2)));
 764         if (ret)
 765                 return ret;
 766
 767         ret = regmap_write(tc->regmap, HTIM02,
 768                            FIELD_PREP(HDISPR, ALIGN(mode->hdisplay, 2)) |
 769                            FIELD_PREP(HFPR, ALIGN(right_margin, 2)));
 770         if (ret)
 771                 return ret;
 772
 773         ret = regmap_write(tc->regmap, VTIM01,
 774                            FIELD_PREP(VBPR, upper_margin) |
 775                            FIELD_PREP(VSPR, vsync_len));
 776         if (ret)
 777                 return ret;
 778
 779         ret = regmap_write(tc->regmap, VTIM02,
 780                            FIELD_PREP(VFPR, lower_margin) |
 781                            FIELD_PREP(VDISPR, mode->vdisplay));
 782         if (ret)
 783                 return ret;
 784
 785         ret = regmap_write(tc->regmap, VFUEN0, VFUEN); /* update settings */
 786         if (ret)
 787                 return ret;
 788
 789         /* Test pattern settings */
 790         ret = regmap_write(tc->regmap, TSTCTL,
 791                            FIELD_PREP(COLOR_R, 120) |
 792                            FIELD_PREP(COLOR_G, 20) |
 793                            FIELD_PREP(COLOR_B, 99) |
 794                            ENI2CFILTER |
 795                            FIELD_PREP(COLOR_BAR_MODE, COLOR_BAR_MODE_BARS));
 796         if (ret)
 797                 return ret;
 798
 799         /* DP Main Stream Attributes */
 800         vid_sync_dly = hsync_len + left_margin + mode->hdisplay;
 801         ret = regmap_write(tc->regmap, DP0_VIDSYNCDELAY,
 802                  FIELD_PREP(THRESH_DLY, max_tu_symbol) |
 803                  FIELD_PREP(VID_SYNC_DLY, vid_sync_dly));
 804
 805         ret = regmap_write(tc->regmap, DP0_TOTALVAL,
 806                            FIELD_PREP(H_TOTAL, mode->htotal) |
 807                            FIELD_PREP(V_TOTAL, mode->vtotal));
 808         if (ret)
 809                 return ret;
 810
 811         ret = regmap_write(tc->regmap, DP0_STARTVAL,
 812                            FIELD_PREP(H_START, left_margin + hsync_len) |
 813                            FIELD_PREP(V_START, upper_margin + vsync_len));
 814         if (ret)
 815                 return ret;
 816
 817         ret = regmap_write(tc->regmap, DP0_ACTIVEVAL,
 818                            FIELD_PREP(V_ACT, mode->vdisplay) |
 819                            FIELD_PREP(H_ACT, mode->hdisplay));
 820         if (ret)
 821                 return ret;
 822
 823         dp0_syncval = FIELD_PREP(VS_WIDTH, vsync_len) |
 824                       FIELD_PREP(HS_WIDTH, hsync_len);
 825
 826         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 827                 dp0_syncval |= SYNCVAL_VS_POL_ACTIVE_LOW;
 828
 829         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
 830                 dp0_syncval |= SYNCVAL_HS_POL_ACTIVE_LOW;
 831
 832         ret = regmap_write(tc->regmap, DP0_SYNCVAL, dp0_syncval);
 833         if (ret)
 834                 return ret;
 835
 836         ret = regmap_write(tc->regmap, DPIPXLFMT,
 837                            VS_POL_ACTIVE_LOW | HS_POL_ACTIVE_LOW |
 838                            DE_POL_ACTIVE_HIGH | SUB_CFG_TYPE_CONFIG1 |
 839                            DPI_BPP_RGB888);
 840         if (ret)
 841                 return ret;
 842
 843         ret = regmap_write(tc->regmap, DP0_MISC,
 844                            FIELD_PREP(MAX_TU_SYMBOL, max_tu_symbol) |
 845                            FIELD_PREP(TU_SIZE, TU_SIZE_RECOMMENDED) |
 846                            BPC_8);
 847         if (ret)
 848                 return ret;
 849
 850         return 0;
 851 }
 852
 853 static int tc_wait_link_training(struct tc_data *tc)
 854 {
 855         u32 value;
 856         int ret;
 857
 858         ret = tc_poll_timeout(tc, DP0_LTSTAT, LT_LOOPDONE,
 859                               LT_LOOPDONE, 1, 1000);
 860         if (ret) {
 861                 dev_err(tc->dev, "Link training timeout waiting for LT_LOOPDONE!\n");
 862                 return ret;
 863         }
 864
 865         ret = regmap_read(tc->regmap, DP0_LTSTAT, &value);
 866         if (ret)
 867                 return ret;
 868
 869         return (value >> 8) & 0x7;
 870 }
 871
 872 static int tc_main_link_enable(struct tc_data *tc)
 873 {
 874         struct drm_dp_aux *aux = &tc->aux;
 875         struct device *dev = tc->dev;
 876         u32 dp_phy_ctrl;
 877         u32 value;
 878         int ret;
 879         u8 tmp[DP_LINK_STATUS_SIZE];
 880
 881         dev_dbg(tc->dev, "link enable\n");
 882
 883         ret = regmap_read(tc->regmap, DP0CTL, &value);
 884         if (ret)
 885                 return ret;
 886
 887         if (WARN_ON(value & DP_EN)) {
 888                 ret = regmap_write(tc->regmap, DP0CTL, 0);
 889                 if (ret)
 890                         return ret;
 891         }
 892
 893         ret = regmap_write(tc->regmap, DP0_SRCCTRL, tc_srcctrl(tc));
 894         if (ret)
 895                 return ret;
 896         /* SSCG and BW27 on DP1 must be set to the same as on DP0 */
 897         ret = regmap_write(tc->regmap, DP1_SRCCTRL,
 898                  (tc->link.spread ? DP0_SRCCTRL_SSCG : 0) |
 899                  ((tc->link.base.rate != 162000) ? DP0_SRCCTRL_BW27 : 0));
 900         if (ret)
 901                 return ret;
 902
 903         ret = tc_set_syspllparam(tc);
 904         if (ret)
 905                 return ret;
 906
 907         /* Setup Main Link */
 908         dp_phy_ctrl = BGREN | PWR_SW_EN | PHY_A0_EN | PHY_M0_EN;
 909         if (tc->link.base.num_lanes == 2)
 910                 dp_phy_ctrl |= PHY_2LANE;
 911
 912         ret = regmap_write(tc->regmap, DP_PHY_CTRL, dp_phy_ctrl);
 913         if (ret)
 914                 return ret;
 915
 916         /* PLL setup */
 917         ret = tc_pllupdate(tc, DP0_PLLCTRL);
 918         if (ret)
 919                 return ret;
 920
 921         ret = tc_pllupdate(tc, DP1_PLLCTRL);
 922         if (ret)
 923                 return ret;
 924
 925         /* Reset/Enable Main Links */
 926         dp_phy_ctrl |= DP_PHY_RST | PHY_M1_RST | PHY_M0_RST;
 927         ret = regmap_write(tc->regmap, DP_PHY_CTRL, dp_phy_ctrl);
 928         usleep_range(100, 200);
 929         dp_phy_ctrl &= ~(DP_PHY_RST | PHY_M1_RST | PHY_M0_RST);
 930         ret = regmap_write(tc->regmap, DP_PHY_CTRL, dp_phy_ctrl);
 931
 932         ret = tc_poll_timeout(tc, DP_PHY_CTRL, PHY_RDY, PHY_RDY, 1, 1000);
 933         if (ret) {
 934                 dev_err(dev, "timeout waiting for phy become ready");
 935                 return ret;
 936         }
 937
 938         /* Set misc: 8 bits per color */
 939         ret = regmap_update_bits(tc->regmap, DP0_MISC, BPC_8, BPC_8);
 940         if (ret)
 941                 return ret;
 942
 943         /*
 944          * ASSR mode
 945          * on TC358767 side ASSR configured through strap pin
 946          * seems there is no way to change this setting from SW
 947          *
 948          * check is tc configured for same mode
 949          */
 950         if (tc->assr != tc->link.assr) {
 951                 dev_dbg(dev, "Trying to set display to ASSR: %d\n",
 952                         tc->assr);
 953                 /* try to set ASSR on display side */
 954                 tmp[0] = tc->assr;
 955                 ret = drm_dp_dpcd_writeb(aux, DP_EDP_CONFIGURATION_SET, tmp[0]);
 956                 if (ret < 0)
 957                         goto err_dpcd_read;
 958                 /* read back */
 959                 ret = drm_dp_dpcd_readb(aux, DP_EDP_CONFIGURATION_SET, tmp);
 960                 if (ret < 0)
 961                         goto err_dpcd_read;
 962
 963                 if (tmp[0] != tc->assr) {
 964                         dev_dbg(dev, "Failed to switch display ASSR to %d, falling back to unscrambled mode\n",
 965                                 tc->assr);
 966                         /* trying with disabled scrambler */
 967                         tc->link.scrambler_dis = true;
 968                 }
 969         }
 970
 971         /* Setup Link & DPRx Config for Training */
 972         ret = drm_dp_link_configure(aux, &tc->link.base);
 973         if (ret < 0)
 974                 goto err_dpcd_write;
 975
 976         /* DOWNSPREAD_CTRL */
 977         tmp[0] = tc->link.spread ? DP_SPREAD_AMP_0_5 : 0x00;
 978         /* MAIN_LINK_CHANNEL_CODING_SET */
 979         tmp[1] =  DP_SET_ANSI_8B10B;
 980         ret = drm_dp_dpcd_write(aux, DP_DOWNSPREAD_CTRL, tmp, 2);
 981         if (ret < 0)
 982                 goto err_dpcd_write;
 983
 984         /* Reset voltage-swing & pre-emphasis */
 985         tmp[0] = tmp[1] = DP_TRAIN_VOLTAGE_SWING_LEVEL_0 |
 986                           DP_TRAIN_PRE_EMPH_LEVEL_0;
 987         ret = drm_dp_dpcd_write(aux, DP_TRAINING_LANE0_SET, tmp, 2);
 988         if (ret < 0)
 989                 goto err_dpcd_write;
 990
 991         /* Clock-Recovery */
 992
 993         /* Set DPCD 0x102 for Training Pattern 1 */
 994         ret = regmap_write(tc->regmap, DP0_SNKLTCTRL,
 995                            DP_LINK_SCRAMBLING_DISABLE |
 996                            DP_TRAINING_PATTERN_1);
 997         if (ret)
 998                 return ret;
 999
1000         ret = regmap_write(tc->regmap, DP0_LTLOOPCTRL,
1001                            (15 << 28) | /* Defer Iteration Count */
1002                            (15 << 24) | /* Loop Iteration Count */
1003                            (0xd << 0)); /* Loop Timer Delay */
1004         if (ret)
1005                 return ret;
1006
1007         ret = regmap_write(tc->regmap, DP0_SRCCTRL,
1008                            tc_srcctrl(tc) | DP0_SRCCTRL_SCRMBLDIS |
1009                            DP0_SRCCTRL_AUTOCORRECT |
1010                            DP0_SRCCTRL_TP1);
1011         if (ret)
1012                 return ret;
1013
1014         /* Enable DP0 to start Link Training */
1015         ret = regmap_write(tc->regmap, DP0CTL,
1016                            ((tc->link.base.capabilities &
1017                              DP_LINK_CAP_ENHANCED_FRAMING) ? EF_EN : 0) |
1018                            DP_EN);
1019         if (ret)
1020                 return ret;
1021
1022         /* wait */
1023
1024         ret = tc_wait_link_training(tc);
1025         if (ret < 0)
1026                 return ret;
1027
1028         if (ret) {
1029                 dev_err(tc->dev, "Link training phase 1 failed: %s\n",
1030                         training_pattern1_errors[ret]);
1031                 return -ENODEV;
1032         }
1033
1034         /* Channel Equalization */
1035
1036         /* Set DPCD 0x102 for Training Pattern 2 */
1037         ret = regmap_write(tc->regmap, DP0_SNKLTCTRL,
1038                            DP_LINK_SCRAMBLING_DISABLE |
1039                            DP_TRAINING_PATTERN_2);
1040         if (ret)
1041                 return ret;
1042
1043         ret = regmap_write(tc->regmap, DP0_SRCCTRL,
1044                            tc_srcctrl(tc) | DP0_SRCCTRL_SCRMBLDIS |
1045                            DP0_SRCCTRL_AUTOCORRECT |
1046                            DP0_SRCCTRL_TP2);
1047         if (ret)
1048                 return ret;
1049
1050         /* wait */
1051         ret = tc_wait_link_training(tc);
1052         if (ret < 0)
1053                 return ret;
1054
1055         if (ret) {
1056                 dev_err(tc->dev, "Link training phase 2 failed: %s\n",
1057                         training_pattern2_errors[ret]);
1058                 return -ENODEV;
1059         }
1060
1061         /*
1062          * Toshiba's documentation suggests to first clear DPCD 0x102, then
1063          * clear the training pattern bit in DP0_SRCCTRL. Testing shows
1064          * that the link sometimes drops if those steps are done in that order,
1065          * but if the steps are done in reverse order, the link stays up.
1066          *
1067          * So we do the steps differently than documented here.
1068          */
1069
1070         /* Clear Training Pattern, set AutoCorrect Mode = 1 */
1071         ret = regmap_write(tc->regmap, DP0_SRCCTRL, tc_srcctrl(tc) |
1072                            DP0_SRCCTRL_AUTOCORRECT);
1073         if (ret)
1074                 return ret;
1075
1076         /* Clear DPCD 0x102 */
1077         /* Note: Can Not use DP0_SNKLTCTRL (0x06E4) short cut */
1078         tmp[0] = tc->link.scrambler_dis ? DP_LINK_SCRAMBLING_DISABLE : 0x00;
1079         ret = drm_dp_dpcd_writeb(aux, DP_TRAINING_PATTERN_SET, tmp[0]);
1080         if (ret < 0)
1081                 goto err_dpcd_write;
1082
1083         /* Check link status */
1084         ret = drm_dp_dpcd_read_link_status(aux, tmp);
1085         if (ret < 0)
1086                 goto err_dpcd_read;
1087
1088         ret = 0;
1089
1090         value = tmp[0] & DP_CHANNEL_EQ_BITS;
1091
1092         if (value != DP_CHANNEL_EQ_BITS) {
1093                 dev_err(tc->dev, "Lane 0 failed: %x\n", value);
1094                 ret = -ENODEV;
1095         }
1096
1097         if (tc->link.base.num_lanes == 2) {
1098                 value = (tmp[0] >> 4) & DP_CHANNEL_EQ_BITS;
1099
1100                 if (value != DP_CHANNEL_EQ_BITS) {
1101                         dev_err(tc->dev, "Lane 1 failed: %x\n", value);
1102                         ret = -ENODEV;
1103                 }
1104
1105                 if (!(tmp[2] & DP_INTERLANE_ALIGN_DONE)) {
1106                         dev_err(tc->dev, "Interlane align failed\n");
1107                         ret = -ENODEV;
1108                 }
1109         }
1110
1111         if (ret) {
1112                 dev_err(dev, "0x0202 LANE0_1_STATUS:            0x%02x\n", tmp[0]);
1113                 dev_err(dev, "0x0203 LANE2_3_STATUS             0x%02x\n", tmp[1]);
1114                 dev_err(dev, "0x0204 LANE_ALIGN_STATUS_UPDATED: 0x%02x\n", tmp[2]);
1115                 dev_err(dev, "0x0205 SINK_STATUS:               0x%02x\n", tmp[3]);
1116                 dev_err(dev, "0x0206 ADJUST_REQUEST_LANE0_1:    0x%02x\n", tmp[4]);
1117                 dev_err(dev, "0x0207 ADJUST_REQUEST_LANE2_3:    0x%02x\n", tmp[5]);
1118                 return ret;
1119         }
1120
1121         return 0;
1122 err_dpcd_read:
1123         dev_err(tc->dev, "Failed to read DPCD: %d\n", ret);
1124         return ret;
1125 err_dpcd_write:
1126         dev_err(tc->dev, "Failed to write DPCD: %d\n", ret);
1127         return ret;
1128 }
1129
1130 static int tc_main_link_disable(struct tc_data *tc)
1131 {
1132         int ret;
1133
1134         dev_dbg(tc->dev, "link disable\n");
1135
1136         ret = regmap_write(tc->regmap, DP0_SRCCTRL, 0);
1137         if (ret)
1138                 return ret;
1139
1140         return regmap_write(tc->regmap, DP0CTL, 0);
1141 }
1142
1143 static int tc_stream_enable(struct tc_data *tc)
1144 {
1145         int ret;
1146         u32 value;
1147
1148         dev_dbg(tc->dev, "enable video stream\n");
1149
1150         /* PXL PLL setup */
1151         if (tc_test_pattern) {
1152                 ret = tc_pxl_pll_en(tc, clk_get_rate(tc->refclk),
1153                                     1000 * tc->mode.clock);
1154                 if (ret)
1155                         return ret;
1156         }
1157
1158         ret = tc_set_video_mode(tc, &tc->mode);
1159         if (ret)
1160                 return ret;
1161
1162         /* Set M/N */
1163         ret = tc_stream_clock_calc(tc);
1164         if (ret)
1165                 return ret;
1166
1167         value = VID_MN_GEN | DP_EN;
1168         if (tc->link.base.capabilities & DP_LINK_CAP_ENHANCED_FRAMING)
1169                 value |= EF_EN;
1170         ret = regmap_write(tc->regmap, DP0CTL, value);
1171         if (ret)
1172                 return ret;
1173         /*
1174          * VID_EN assertion should be delayed by at least N * LSCLK
1175          * cycles from the time VID_MN_GEN is enabled in order to
1176          * generate stable values for VID_M. LSCLK is 270 MHz or
1177          * 162 MHz, VID_N is set to 32768 in  tc_stream_clock_calc(),
1178          * so a delay of at least 203 us should suffice.
1179          */
1180         usleep_range(500, 1000);
1181         value |= VID_EN;
1182         ret = regmap_write(tc->regmap, DP0CTL, value);
1183         if (ret)
1184                 return ret;
1185         /* Set input interface */
1186         value = DP0_AUDSRC_NO_INPUT;
1187         if (tc_test_pattern)
1188                 value |= DP0_VIDSRC_COLOR_BAR;
1189         else
1190                 value |= DP0_VIDSRC_DPI_RX;
1191         ret = regmap_write(tc->regmap, SYSCTRL, value);
1192         if (ret)
1193                 return ret;
1194
1195         return 0;
1196 }
1197
1198 static int tc_stream_disable(struct tc_data *tc)
1199 {
1200         int ret;
1201
1202         dev_dbg(tc->dev, "disable video stream\n");
1203
1204         ret = regmap_update_bits(tc->regmap, DP0CTL, VID_EN, 0);
1205         if (ret)
1206                 return ret;
1207
1208         tc_pxl_pll_dis(tc);
1209
1210         return 0;
1211 }
1212
1213 static void tc_bridge_pre_enable(struct drm_bridge *bridge)
1214 {
1215         struct tc_data *tc = bridge_to_tc(bridge);
1216
1217         drm_panel_prepare(tc->panel);
1218 }
1219
1220 static void tc_bridge_enable(struct drm_bridge *bridge)
1221 {
1222         struct tc_data *tc = bridge_to_tc(bridge);
1223         int ret;
1224
1225         ret = tc_get_display_props(tc);
1226         if (ret < 0) {
1227                 dev_err(tc->dev, "failed to read display props: %d\n", ret);
1228                 return;
1229         }
1230
1231         ret = tc_main_link_enable(tc);
1232         if (ret < 0) {
1233                 dev_err(tc->dev, "main link enable error: %d\n", ret);
1234                 return;
1235         }
1236
1237         ret = tc_stream_enable(tc);
1238         if (ret < 0) {
1239                 dev_err(tc->dev, "main link stream start error: %d\n", ret);
1240                 tc_main_link_disable(tc);
1241                 return;
1242         }
1243
1244         drm_panel_enable(tc->panel);
1245 }
1246
1247 static void tc_bridge_disable(struct drm_bridge *bridge)
1248 {
1249         struct tc_data *tc = bridge_to_tc(bridge);
1250         int ret;
1251
1252         drm_panel_disable(tc->panel);
1253
1254         ret = tc_stream_disable(tc);
1255         if (ret < 0)
1256                 dev_err(tc->dev, "main link stream stop error: %d\n", ret);
1257
1258         ret = tc_main_link_disable(tc);
1259         if (ret < 0)
1260                 dev_err(tc->dev, "main link disable error: %d\n", ret);
1261 }
1262
1263 static void tc_bridge_post_disable(struct drm_bridge *bridge)
1264 {
1265         struct tc_data *tc = bridge_to_tc(bridge);
1266
1267         drm_panel_unprepare(tc->panel);
1268 }
1269
1270 static bool tc_bridge_mode_fixup(struct drm_bridge *bridge,
1271                                  const struct drm_display_mode *mode,
1272                                  struct drm_display_mode *adj)
1273 {
1274         /* Fixup sync polarities, both hsync and vsync are active low */
1275         adj->flags = mode->flags;
1276         adj->flags |= (DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
1277         adj->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
1278
1279         return true;
1280 }
1281
1282 static enum drm_mode_status tc_mode_valid(struct drm_bridge *bridge,
1283                                           const struct drm_display_mode *mode)
1284 {
1285         struct tc_data *tc = bridge_to_tc(bridge);
1286         u32 req, avail;
1287         u32 bits_per_pixel = 24;
1288
1289         /* DPI interface clock limitation: upto 154 MHz */
1290         if (mode->clock > 154000)
1291                 return MODE_CLOCK_HIGH;
1292
1293         req = mode->clock * bits_per_pixel / 8;
1294         avail = tc->link.base.num_lanes * tc->link.base.rate;
1295
1296         if (req > avail)
1297                 return MODE_BAD;
1298
1299         return MODE_OK;
1300 }
1301
1302 static void tc_bridge_mode_set(struct drm_bridge *bridge,
1303                                const struct drm_display_mode *mode,
1304                                const struct drm_display_mode *adj)
1305 {
1306         struct tc_data *tc = bridge_to_tc(bridge);
1307
1308         tc->mode = *mode;
1309 }
1310
1311 static int tc_connector_get_modes(struct drm_connector *connector)
1312 {
1313         struct tc_data *tc = connector_to_tc(connector);
1314         struct edid *edid;
1315         int count;
1316         int ret;
1317
1318         ret = tc_get_display_props(tc);
1319         if (ret < 0) {
1320                 dev_err(tc->dev, "failed to read display props: %d\n", ret);
1321                 return 0;
1322         }
1323
1324         count = drm_panel_get_modes(tc->panel);
1325         if (count > 0)
1326                 return count;
1327
1328         edid = drm_get_edid(connector, &tc->aux.ddc);
1329
1330         kfree(tc->edid);
1331         tc->edid = edid;
1332         if (!edid)
1333                 return 0;
1334
1335         drm_connector_update_edid_property(connector, edid);
1336         count = drm_add_edid_modes(connector, edid);
1337
1338         return count;
1339 }
1340
1341 static const struct drm_connector_helper_funcs tc_connector_helper_funcs = {
1342         .get_modes = tc_connector_get_modes,
1343 };
1344
1345 static enum drm_connector_status tc_connector_detect(struct drm_connector *connector,
1346                                                      bool force)
1347 {
1348         struct tc_data *tc = connector_to_tc(connector);
1349         bool conn;
1350         u32 val;
1351         int ret;
1352
1353         if (tc->hpd_pin < 0) {
1354                 if (tc->panel)
1355                         return connector_status_connected;
1356                 else
1357                         return connector_status_unknown;
1358         }
1359
1360         ret = regmap_read(tc->regmap, GPIOI, &val);
1361         if (ret)
1362                 return connector_status_unknown;
1363
1364         conn = val & BIT(tc->hpd_pin);
1365
1366         if (conn)
1367                 return connector_status_connected;
1368         else
1369                 return connector_status_disconnected;
1370 }
1371
1372 static const struct drm_connector_funcs tc_connector_funcs = {
1373         .detect = tc_connector_detect,
1374         .fill_modes = drm_helper_probe_single_connector_modes,
1375         .destroy = drm_connector_cleanup,
1376         .reset = drm_atomic_helper_connector_reset,
1377         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
1378         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
1379 };
1380
1381 static int tc_bridge_attach(struct drm_bridge *bridge)
1382 {
1383         u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
1384         struct tc_data *tc = bridge_to_tc(bridge);
1385         struct drm_device *drm = bridge->dev;
1386         int ret;
1387
1388         /* Create DP/eDP connector */
1389         drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs);
1390         ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs,
1391                                  tc->panel ? DRM_MODE_CONNECTOR_eDP :
1392                                  DRM_MODE_CONNECTOR_DisplayPort);
1393         if (ret)
1394                 return ret;
1395
1396         /* Don't poll if don't have HPD connected */
1397         if (tc->hpd_pin >= 0) {
1398                 if (tc->have_irq)
1399                         tc->connector.polled = DRM_CONNECTOR_POLL_HPD;
1400                 else
1401                         tc->connector.polled = DRM_CONNECTOR_POLL_CONNECT |
1402                                                DRM_CONNECTOR_POLL_DISCONNECT;
1403         }
1404
1405         if (tc->panel)
1406                 drm_panel_attach(tc->panel, &tc->connector);
1407
1408         drm_display_info_set_bus_formats(&tc->connector.display_info,
1409                                          &bus_format, 1);
1410         tc->connector.display_info.bus_flags =
1411                 DRM_BUS_FLAG_DE_HIGH |
1412                 DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE |
1413                 DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
1414         drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder);
1415
1416         return 0;
1417 }
1418
1419 static const struct drm_bridge_funcs tc_bridge_funcs = {
1420         .attach = tc_bridge_attach,
1421         .mode_valid = tc_mode_valid,
1422         .mode_set = tc_bridge_mode_set,
1423         .pre_enable = tc_bridge_pre_enable,
1424         .enable = tc_bridge_enable,
1425         .disable = tc_bridge_disable,
1426         .post_disable = tc_bridge_post_disable,
1427         .mode_fixup = tc_bridge_mode_fixup,
1428 };
1429
1430 static bool tc_readable_reg(struct device *dev, unsigned int reg)
1431 {
1432         return reg != SYSCTRL;
1433 }
1434
1435 static const struct regmap_range tc_volatile_ranges[] = {
1436         regmap_reg_range(DP0_AUXWDATA(0), DP0_AUXSTATUS),
1437         regmap_reg_range(DP0_LTSTAT, DP0_SNKLTCHGREQ),
1438         regmap_reg_range(DP_PHY_CTRL, DP_PHY_CTRL),
1439         regmap_reg_range(DP0_PLLCTRL, PXL_PLLCTRL),
1440         regmap_reg_range(VFUEN0, VFUEN0),
1441         regmap_reg_range(INTSTS_G, INTSTS_G),
1442         regmap_reg_range(GPIOI, GPIOI),
1443 };
1444
1445 static const struct regmap_access_table tc_volatile_table = {
1446         .yes_ranges = tc_volatile_ranges,
1447         .n_yes_ranges = ARRAY_SIZE(tc_volatile_ranges),
1448 };
1449
1450 static bool tc_writeable_reg(struct device *dev, unsigned int reg)
1451 {
1452         return (reg != TC_IDREG) &&
1453                (reg != DP0_LTSTAT) &&
1454                (reg != DP0_SNKLTCHGREQ);
1455 }
1456
1457 static const struct regmap_config tc_regmap_config = {
1458         .name = "tc358767",
1459         .reg_bits = 16,
1460         .val_bits = 32,
1461         .reg_stride = 4,
1462         .max_register = PLL_DBG,
1463         .cache_type = REGCACHE_RBTREE,
1464         .readable_reg = tc_readable_reg,
1465         .volatile_table = &tc_volatile_table,
1466         .writeable_reg = tc_writeable_reg,
1467         .reg_format_endian = REGMAP_ENDIAN_BIG,
1468         .val_format_endian = REGMAP_ENDIAN_LITTLE,
1469 };
1470
1471 static irqreturn_t tc_irq_handler(int irq, void *arg)
1472 {
1473         struct tc_data *tc = arg;
1474         u32 val;
1475         int r;
1476
1477         r = regmap_read(tc->regmap, INTSTS_G, &val);
1478         if (r)
1479                 return IRQ_NONE;
1480
1481         if (!val)
1482                 return IRQ_NONE;
1483
1484         if (val & INT_SYSERR) {
1485                 u32 stat = 0;
1486
1487                 regmap_read(tc->regmap, SYSSTAT, &stat);
1488
1489                 dev_err(tc->dev, "syserr %x\n", stat);
1490         }
1491
1492         if (tc->hpd_pin >= 0 && tc->bridge.dev) {
1493                 /*
1494                  * H is triggered when the GPIO goes high.
1495                  *
1496                  * LC is triggered when the GPIO goes low and stays low for
1497                  * the duration of LCNT
1498                  */
1499                 bool h = val & INT_GPIO_H(tc->hpd_pin);
1500                 bool lc = val & INT_GPIO_LC(tc->hpd_pin);
1501
1502                 dev_dbg(tc->dev, "GPIO%d: %s %s\n", tc->hpd_pin,
1503                         h ? "H" : "", lc ? "LC" : "");
1504
1505                 if (h || lc)
1506                         drm_kms_helper_hotplug_event(tc->bridge.dev);
1507         }
1508
1509         regmap_write(tc->regmap, INTSTS_G, val);
1510
1511         return IRQ_HANDLED;
1512 }
1513
1514 static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
1515 {
1516         struct device *dev = &client->dev;
1517         struct tc_data *tc;
1518         int ret;
1519
1520         tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
1521         if (!tc)
1522                 return -ENOMEM;
1523
1524         tc->dev = dev;
1525
1526         /* port@2 is the output port */
1527         ret = drm_of_find_panel_or_bridge(dev->of_node, 2, 0, &tc->panel, NULL);
1528         if (ret && ret != -ENODEV)
1529                 return ret;
1530
1531         /* Shut down GPIO is optional */
1532         tc->sd_gpio = devm_gpiod_get_optional(dev, "shutdown", GPIOD_OUT_HIGH);
1533         if (IS_ERR(tc->sd_gpio))
1534                 return PTR_ERR(tc->sd_gpio);
1535
1536         if (tc->sd_gpio) {
1537                 gpiod_set_value_cansleep(tc->sd_gpio, 0);
1538                 usleep_range(5000, 10000);
1539         }
1540
1541         /* Reset GPIO is optional */
1542         tc->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
1543         if (IS_ERR(tc->reset_gpio))
1544                 return PTR_ERR(tc->reset_gpio);
1545
1546         if (tc->reset_gpio) {
1547                 gpiod_set_value_cansleep(tc->reset_gpio, 1);
1548                 usleep_range(5000, 10000);
1549         }
1550
1551         tc->refclk = devm_clk_get(dev, "ref");
1552         if (IS_ERR(tc->refclk)) {
1553                 ret = PTR_ERR(tc->refclk);
1554                 dev_err(dev, "Failed to get refclk: %d\n", ret);
1555                 return ret;
1556         }
1557
1558         tc->regmap = devm_regmap_init_i2c(client, &tc_regmap_config);
1559         if (IS_ERR(tc->regmap)) {
1560                 ret = PTR_ERR(tc->regmap);
1561                 dev_err(dev, "Failed to initialize regmap: %d\n", ret);
1562                 return ret;
1563         }
1564
1565         ret = of_property_read_u32(dev->of_node, "toshiba,hpd-pin",
1566                                    &tc->hpd_pin);
1567         if (ret) {
1568                 tc->hpd_pin = -ENODEV;
1569         } else {
1570                 if (tc->hpd_pin < 0 || tc->hpd_pin > 1) {
1571                         dev_err(dev, "failed to parse HPD number\n");
1572                         return ret;
1573                 }
1574         }
1575
1576         if (client->irq > 0) {
1577                 /* enable SysErr */
1578                 regmap_write(tc->regmap, INTCTL_G, INT_SYSERR);
1579
1580                 ret = devm_request_threaded_irq(dev, client->irq,
1581                                                 NULL, tc_irq_handler,
1582                                                 IRQF_ONESHOT,
1583                                                 "tc358767-irq", tc);
1584                 if (ret) {
1585                         dev_err(dev, "failed to register dp interrupt\n");
1586                         return ret;
1587                 }
1588
1589                 tc->have_irq = true;
1590         }
1591
1592         ret = regmap_read(tc->regmap, TC_IDREG, &tc->rev);
1593         if (ret) {
1594                 dev_err(tc->dev, "can not read device ID: %d\n", ret);
1595                 return ret;
1596         }
1597
1598         if ((tc->rev != 0x6601) && (tc->rev != 0x6603)) {
1599                 dev_err(tc->dev, "invalid device ID: 0x%08x\n", tc->rev);
1600                 return -EINVAL;
1601         }
1602
1603         tc->assr = (tc->rev == 0x6601); /* Enable ASSR for eDP panels */
1604
1605         if (!tc->reset_gpio) {
1606                 /*
1607                  * If the reset pin isn't present, do a software reset. It isn't
1608                  * as thorough as the hardware reset, as we can't reset the I2C
1609                  * communication block for obvious reasons, but it's getting the
1610                  * chip into a defined state.
1611                  */
1612                 regmap_update_bits(tc->regmap, SYSRSTENB,
1613                                 ENBLCD0 | ENBBM | ENBDSIRX | ENBREG | ENBHDCP,
1614                                 0);
1615                 regmap_update_bits(tc->regmap, SYSRSTENB,
1616                                 ENBLCD0 | ENBBM | ENBDSIRX | ENBREG | ENBHDCP,
1617                                 ENBLCD0 | ENBBM | ENBDSIRX | ENBREG | ENBHDCP);
1618                 usleep_range(5000, 10000);
1619         }
1620
1621         if (tc->hpd_pin >= 0) {
1622                 u32 lcnt_reg = tc->hpd_pin == 0 ? INT_GP0_LCNT : INT_GP1_LCNT;
1623                 u32 h_lc = INT_GPIO_H(tc->hpd_pin) | INT_GPIO_LC(tc->hpd_pin);
1624
1625                 /* Set LCNT to 2ms */
1626                 regmap_write(tc->regmap, lcnt_reg,
1627                              clk_get_rate(tc->refclk) * 2 / 1000);
1628                 /* We need the "alternate" mode for HPD */
1629                 regmap_write(tc->regmap, GPIOM, BIT(tc->hpd_pin));
1630
1631                 if (tc->have_irq) {
1632                         /* enable H & LC */
1633                         regmap_update_bits(tc->regmap, INTCTL_G, h_lc, h_lc);
1634                 }
1635         }
1636
1637         ret = tc_aux_link_setup(tc);
1638         if (ret)
1639                 return ret;
1640
1641         /* Register DP AUX channel */
1642         tc->aux.name = "TC358767 AUX i2c adapter";
1643         tc->aux.dev = tc->dev;
1644         tc->aux.transfer = tc_aux_transfer;
1645         ret = drm_dp_aux_register(&tc->aux);
1646         if (ret)
1647                 return ret;
1648
1649         tc->bridge.funcs = &tc_bridge_funcs;
1650         tc->bridge.of_node = dev->of_node;
1651         drm_bridge_add(&tc->bridge);
1652
1653         i2c_set_clientdata(client, tc);
1654
1655         return 0;
1656 }
1657
1658 static int tc_remove(struct i2c_client *client)
1659 {
1660         struct tc_data *tc = i2c_get_clientdata(client);
1661
1662         drm_bridge_remove(&tc->bridge);
1663         drm_dp_aux_unregister(&tc->aux);
1664
1665         return 0;
1666 }
1667
1668 static const struct i2c_device_id tc358767_i2c_ids[] = {
1669         { "tc358767", 0 },
1670         { }
1671 };
1672 MODULE_DEVICE_TABLE(i2c, tc358767_i2c_ids);
1673
1674 static const struct of_device_id tc358767_of_ids[] = {
1675         { .compatible = "toshiba,tc358767", },
1676         { }
1677 };
1678 MODULE_DEVICE_TABLE(of, tc358767_of_ids);
1679
1680 static struct i2c_driver tc358767_driver = {
1681         .driver = {
1682                 .name = "tc358767",
1683                 .of_match_table = tc358767_of_ids,
1684         },
1685         .id_table = tc358767_i2c_ids,
1686         .probe = tc_probe,
1687         .remove = tc_remove,
1688 };
1689 module_i2c_driver(tc358767_driver);
1690
1691 MODULE_AUTHOR("Andrey Gusakov <[email protected]>");
1692 MODULE_DESCRIPTION("tc358767 eDP encoder driver");
1693 MODULE_LICENSE("GPL");