drivers/gpu/drm/bridge/tc358768.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Copyright (C) 2020 Texas Instruments Incorporated - https://www.ti.com
   4  *  Author: Peter Ujfalusi <[email protected]>
   5  */
   6
   7 #include <linux/clk.h>
   8 #include <linux/device.h>
   9 #include <linux/gpio/consumer.h>
  10 #include <linux/i2c.h>
  11 #include <linux/kernel.h>
  12 #include <linux/math64.h>
  13 #include <linux/media-bus-format.h>
  14 #include <linux/minmax.h>
  15 #include <linux/module.h>
  16 #include <linux/regmap.h>
  17 #include <linux/regulator/consumer.h>
  18 #include <linux/slab.h>
  19 #include <linux/units.h>
  20
  21 #include <drm/drm_atomic_helper.h>
  22 #include <drm/drm_drv.h>
  23 #include <drm/drm_mipi_dsi.h>
  24 #include <drm/drm_of.h>
  25 #include <drm/drm_panel.h>
  26 #include <video/mipi_display.h>
  27 #include <video/videomode.h>
  28
  29 /* Global (16-bit addressable) */
  30 #define TC358768_CHIPID                 0x0000
  31 #define TC358768_SYSCTL                 0x0002
  32 #define TC358768_CONFCTL                0x0004
  33 #define TC358768_VSDLY                  0x0006
  34 #define TC358768_DATAFMT                0x0008
  35 #define TC358768_GPIOEN                 0x000E
  36 #define TC358768_GPIODIR                0x0010
  37 #define TC358768_GPIOIN                 0x0012
  38 #define TC358768_GPIOOUT                0x0014
  39 #define TC358768_PLLCTL0                0x0016
  40 #define TC358768_PLLCTL1                0x0018
  41 #define TC358768_CMDBYTE                0x0022
  42 #define TC358768_PP_MISC                0x0032
  43 #define TC358768_DSITX_DT               0x0050
  44 #define TC358768_FIFOSTATUS             0x00F8
  45
  46 /* Debug (16-bit addressable) */
  47 #define TC358768_VBUFCTRL               0x00E0
  48 #define TC358768_DBG_WIDTH              0x00E2
  49 #define TC358768_DBG_VBLANK             0x00E4
  50 #define TC358768_DBG_DATA               0x00E8
  51
  52 /* TX PHY (32-bit addressable) */
  53 #define TC358768_CLW_DPHYCONTTX         0x0100
  54 #define TC358768_D0W_DPHYCONTTX         0x0104
  55 #define TC358768_D1W_DPHYCONTTX         0x0108
  56 #define TC358768_D2W_DPHYCONTTX         0x010C
  57 #define TC358768_D3W_DPHYCONTTX         0x0110
  58 #define TC358768_CLW_CNTRL              0x0140
  59 #define TC358768_D0W_CNTRL              0x0144
  60 #define TC358768_D1W_CNTRL              0x0148
  61 #define TC358768_D2W_CNTRL              0x014C
  62 #define TC358768_D3W_CNTRL              0x0150
  63
  64 /* TX PPI (32-bit addressable) */
  65 #define TC358768_STARTCNTRL             0x0204
  66 #define TC358768_DSITXSTATUS            0x0208
  67 #define TC358768_LINEINITCNT            0x0210
  68 #define TC358768_LPTXTIMECNT            0x0214
  69 #define TC358768_TCLK_HEADERCNT         0x0218
  70 #define TC358768_TCLK_TRAILCNT          0x021C
  71 #define TC358768_THS_HEADERCNT          0x0220
  72 #define TC358768_TWAKEUP                0x0224
  73 #define TC358768_TCLK_POSTCNT           0x0228
  74 #define TC358768_THS_TRAILCNT           0x022C
  75 #define TC358768_HSTXVREGCNT            0x0230
  76 #define TC358768_HSTXVREGEN             0x0234
  77 #define TC358768_TXOPTIONCNTRL          0x0238
  78 #define TC358768_BTACNTRL1              0x023C
  79
  80 /* TX CTRL (32-bit addressable) */
  81 #define TC358768_DSI_CONTROL            0x040C
  82 #define TC358768_DSI_STATUS             0x0410
  83 #define TC358768_DSI_INT                0x0414
  84 #define TC358768_DSI_INT_ENA            0x0418
  85 #define TC358768_DSICMD_RDFIFO          0x0430
  86 #define TC358768_DSI_ACKERR             0x0434
  87 #define TC358768_DSI_ACKERR_INTENA      0x0438
  88 #define TC358768_DSI_ACKERR_HALT        0x043c
  89 #define TC358768_DSI_RXERR              0x0440
  90 #define TC358768_DSI_RXERR_INTENA       0x0444
  91 #define TC358768_DSI_RXERR_HALT         0x0448
  92 #define TC358768_DSI_ERR                0x044C
  93 #define TC358768_DSI_ERR_INTENA         0x0450
  94 #define TC358768_DSI_ERR_HALT           0x0454
  95 #define TC358768_DSI_CONFW              0x0500
  96 #define TC358768_DSI_LPCMD              0x0500
  97 #define TC358768_DSI_RESET              0x0504
  98 #define TC358768_DSI_INT_CLR            0x050C
  99 #define TC358768_DSI_START              0x0518
 100
 101 /* DSITX CTRL (16-bit addressable) */
 102 #define TC358768_DSICMD_TX              0x0600
 103 #define TC358768_DSICMD_TYPE            0x0602
 104 #define TC358768_DSICMD_WC              0x0604
 105 #define TC358768_DSICMD_WD0             0x0610
 106 #define TC358768_DSICMD_WD1             0x0612
 107 #define TC358768_DSICMD_WD2             0x0614
 108 #define TC358768_DSICMD_WD3             0x0616
 109 #define TC358768_DSI_EVENT              0x0620
 110 #define TC358768_DSI_VSW                0x0622
 111 #define TC358768_DSI_VBPR               0x0624
 112 #define TC358768_DSI_VACT               0x0626
 113 #define TC358768_DSI_HSW                0x0628
 114 #define TC358768_DSI_HBPR               0x062A
 115 #define TC358768_DSI_HACT               0x062C
 116
 117 /* TC358768_DSI_CONTROL (0x040C) register */
 118 #define TC358768_DSI_CONTROL_DIS_MODE   BIT(15)
 119 #define TC358768_DSI_CONTROL_TXMD       BIT(7)
 120 #define TC358768_DSI_CONTROL_HSCKMD     BIT(5)
 121 #define TC358768_DSI_CONTROL_EOTDIS     BIT(0)
 122
 123 /* TC358768_DSI_CONFW (0x0500) register */
 124 #define TC358768_DSI_CONFW_MODE_SET     (5 << 29)
 125 #define TC358768_DSI_CONFW_MODE_CLR     (6 << 29)
 126 #define TC358768_DSI_CONFW_ADDR_DSI_CONTROL     (0x3 << 24)
 127
 128 static const char * const tc358768_supplies[] = {
 129         "vddc", "vddmipi", "vddio"
 130 };
 131
 132 struct tc358768_dsi_output {
 133         struct mipi_dsi_device *dev;
 134         struct drm_panel *panel;
 135         struct drm_bridge *bridge;
 136 };
 137
 138 struct tc358768_priv {
 139         struct device *dev;
 140         struct regmap *regmap;
 141         struct gpio_desc *reset_gpio;
 142         struct regulator_bulk_data supplies[ARRAY_SIZE(tc358768_supplies)];
 143         struct clk *refclk;
 144         int enabled;
 145         int error;
 146
 147         struct mipi_dsi_host dsi_host;
 148         struct drm_bridge bridge;
 149         struct tc358768_dsi_output output;
 150
 151         u32 pd_lines; /* number of Parallel Port Input Data Lines */
 152         u32 dsi_lanes; /* number of DSI Lanes */
 153         u32 dsi_bpp; /* number of Bits Per Pixel over DSI */
 154
 155         /* Parameters for PLL programming */
 156         u32 fbd;        /* PLL feedback divider */
 157         u32 prd;        /* PLL input divider */
 158         u32 frs;        /* PLL Freqency range for HSCK (post divider) */
 159
 160         u32 dsiclk;     /* pll_clk / 2 */
 161         u32 pclk;       /* incoming pclk rate */
 162 };
 163
 164 static inline struct tc358768_priv *dsi_host_to_tc358768(struct mipi_dsi_host
 165                                                          *host)
 166 {
 167         return container_of(host, struct tc358768_priv, dsi_host);
 168 }
 169
 170 static inline struct tc358768_priv *bridge_to_tc358768(struct drm_bridge
 171                                                        *bridge)
 172 {
 173         return container_of(bridge, struct tc358768_priv, bridge);
 174 }
 175
 176 static int tc358768_clear_error(struct tc358768_priv *priv)
 177 {
 178         int ret = priv->error;
 179
 180         priv->error = 0;
 181         return ret;
 182 }
 183
 184 static void tc358768_write(struct tc358768_priv *priv, u32 reg, u32 val)
 185 {
 186         /* work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
 187         int tmpval = val;
 188         size_t count = 2;
 189
 190         if (priv->error)
 191                 return;
 192
 193         /* 16-bit register? */
 194         if (reg < 0x100 || reg >= 0x600)
 195                 count = 1;
 196
 197         priv->error = regmap_bulk_write(priv->regmap, reg, &tmpval, count);
 198 }
 199
 200 static void tc358768_read(struct tc358768_priv *priv, u32 reg, u32 *val)
 201 {
 202         size_t count = 2;
 203
 204         if (priv->error)
 205                 return;
 206
 207         /* 16-bit register? */
 208         if (reg < 0x100 || reg >= 0x600) {
 209                 *val = 0;
 210                 count = 1;
 211         }
 212
 213         priv->error = regmap_bulk_read(priv->regmap, reg, val, count);
 214 }
 215
 216 static void tc358768_update_bits(struct tc358768_priv *priv, u32 reg, u32 mask,
 217                                  u32 val)
 218 {
 219         u32 tmp, orig;
 220
 221         tc358768_read(priv, reg, &orig);
 222
 223         if (priv->error)
 224                 return;
 225
 226         tmp = orig & ~mask;
 227         tmp |= val & mask;
 228         if (tmp != orig)
 229                 tc358768_write(priv, reg, tmp);
 230 }
 231
 232 static int tc358768_sw_reset(struct tc358768_priv *priv)
 233 {
 234         /* Assert Reset */
 235         tc358768_write(priv, TC358768_SYSCTL, 1);
 236         /* Release Reset, Exit Sleep */
 237         tc358768_write(priv, TC358768_SYSCTL, 0);
 238
 239         return tc358768_clear_error(priv);
 240 }
 241
 242 static void tc358768_hw_enable(struct tc358768_priv *priv)
 243 {
 244         int ret;
 245
 246         if (priv->enabled)
 247                 return;
 248
 249         ret = clk_prepare_enable(priv->refclk);
 250         if (ret < 0)
 251                 dev_err(priv->dev, "error enabling refclk (%d)\n", ret);
 252
 253         ret = regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
 254         if (ret < 0)
 255                 dev_err(priv->dev, "error enabling regulators (%d)\n", ret);
 256
 257         if (priv->reset_gpio)
 258                 usleep_range(200, 300);
 259
 260         /*
 261          * The RESX is active low (GPIO_ACTIVE_LOW).
 262          * DEASSERT (value = 0) the reset_gpio to enable the chip
 263          */
 264         gpiod_set_value_cansleep(priv->reset_gpio, 0);
 265
 266         /* wait for encoder clocks to stabilize */
 267         usleep_range(1000, 2000);
 268
 269         priv->enabled = true;
 270 }
 271
 272 static void tc358768_hw_disable(struct tc358768_priv *priv)
 273 {
 274         int ret;
 275
 276         if (!priv->enabled)
 277                 return;
 278
 279         /*
 280          * The RESX is active low (GPIO_ACTIVE_LOW).
 281          * ASSERT (value = 1) the reset_gpio to disable the chip
 282          */
 283         gpiod_set_value_cansleep(priv->reset_gpio, 1);
 284
 285         ret = regulator_bulk_disable(ARRAY_SIZE(priv->supplies),
 286                                      priv->supplies);
 287         if (ret < 0)
 288                 dev_err(priv->dev, "error disabling regulators (%d)\n", ret);
 289
 290         clk_disable_unprepare(priv->refclk);
 291
 292         priv->enabled = false;
 293 }
 294
 295 static u32 tc358768_pll_to_pclk(struct tc358768_priv *priv, u32 pll_clk)
 296 {
 297         return (u32)div_u64((u64)pll_clk * priv->dsi_lanes, priv->dsi_bpp);
 298 }
 299
 300 static u32 tc358768_pclk_to_pll(struct tc358768_priv *priv, u32 pclk)
 301 {
 302         return (u32)div_u64((u64)pclk * priv->dsi_bpp, priv->dsi_lanes);
 303 }
 304
 305 static int tc358768_calc_pll(struct tc358768_priv *priv,
 306                              const struct drm_display_mode *mode,
 307                              bool verify_only)
 308 {
 309         static const u32 frs_limits[] = {
 310                 1000000000,
 311                 500000000,
 312                 250000000,
 313                 125000000,
 314                 62500000
 315         };
 316         unsigned long refclk;
 317         u32 prd, target_pll, i, max_pll, min_pll;
 318         u32 frs, best_diff, best_pll, best_prd, best_fbd;
 319
 320         target_pll = tc358768_pclk_to_pll(priv, mode->clock * 1000);
 321
 322         /* pll_clk = RefClk * FBD / PRD * (1 / (2^FRS)) */
 323
 324         for (i = 0; i < ARRAY_SIZE(frs_limits); i++)
 325                 if (target_pll >= frs_limits[i])
 326                         break;
 327
 328         if (i == ARRAY_SIZE(frs_limits) || i == 0)
 329                 return -EINVAL;
 330
 331         frs = i - 1;
 332         max_pll = frs_limits[i - 1];
 333         min_pll = frs_limits[i];
 334
 335         refclk = clk_get_rate(priv->refclk);
 336
 337         best_diff = UINT_MAX;
 338         best_pll = 0;
 339         best_prd = 0;
 340         best_fbd = 0;
 341
 342         for (prd = 1; prd <= 16; ++prd) {
 343                 u32 divisor = prd * (1 << frs);
 344                 u32 fbd;
 345
 346                 for (fbd = 1; fbd <= 512; ++fbd) {
 347                         u32 pll, diff, pll_in;
 348
 349                         pll = (u32)div_u64((u64)refclk * fbd, divisor);
 350
 351                         if (pll >= max_pll || pll < min_pll)
 352                                 continue;
 353
 354                         pll_in = (u32)div_u64((u64)refclk, prd);
 355                         if (pll_in < 4000000)
 356                                 continue;
 357
 358                         diff = max(pll, target_pll) - min(pll, target_pll);
 359
 360                         if (diff < best_diff) {
 361                                 best_diff = diff;
 362                                 best_pll = pll;
 363                                 best_prd = prd;
 364                                 best_fbd = fbd;
 365
 366                                 if (best_diff == 0)
 367                                         goto found;
 368                         }
 369                 }
 370         }
 371
 372         if (best_diff == UINT_MAX) {
 373                 dev_err(priv->dev, "could not find suitable PLL setup\n");
 374                 return -EINVAL;
 375         }
 376
 377 found:
 378         if (verify_only)
 379                 return 0;
 380
 381         priv->fbd = best_fbd;
 382         priv->prd = best_prd;
 383         priv->frs = frs;
 384         priv->dsiclk = best_pll / 2;
 385         priv->pclk = mode->clock * 1000;
 386
 387         return 0;
 388 }
 389
 390 static int tc358768_dsi_host_attach(struct mipi_dsi_host *host,
 391                                     struct mipi_dsi_device *dev)
 392 {
 393         struct tc358768_priv *priv = dsi_host_to_tc358768(host);
 394         struct drm_bridge *bridge;
 395         struct drm_panel *panel;
 396         struct device_node *ep;
 397         int ret;
 398
 399         if (dev->lanes > 4) {
 400                 dev_err(priv->dev, "unsupported number of data lanes(%u)\n",
 401                         dev->lanes);
 402                 return -EINVAL;
 403         }
 404
 405         /*
 406          * tc358768 supports both Video and Pulse mode, but the driver only
 407          * implements Video (event) mode currently
 408          */
 409         if (!(dev->mode_flags & MIPI_DSI_MODE_VIDEO)) {
 410                 dev_err(priv->dev, "Only MIPI_DSI_MODE_VIDEO is supported\n");
 411                 return -ENOTSUPP;
 412         }
 413
 414         /*
 415          * tc358768 supports RGB888, RGB666, RGB666_PACKED and RGB565, but only
 416          * RGB888 is verified.
 417          */
 418         if (dev->format != MIPI_DSI_FMT_RGB888) {
 419                 dev_warn(priv->dev, "Only MIPI_DSI_FMT_RGB888 tested!\n");
 420                 return -ENOTSUPP;
 421         }
 422
 423         ret = drm_of_find_panel_or_bridge(host->dev->of_node, 1, 0, &panel,
 424                                           &bridge);
 425         if (ret)
 426                 return ret;
 427
 428         if (panel) {
 429                 bridge = drm_panel_bridge_add_typed(panel,
 430                                                     DRM_MODE_CONNECTOR_DSI);
 431                 if (IS_ERR(bridge))
 432                         return PTR_ERR(bridge);
 433         }
 434
 435         priv->output.dev = dev;
 436         priv->output.bridge = bridge;
 437         priv->output.panel = panel;
 438
 439         priv->dsi_lanes = dev->lanes;
 440         priv->dsi_bpp = mipi_dsi_pixel_format_to_bpp(dev->format);
 441
 442         /* get input ep (port0/endpoint0) */
 443         ret = -EINVAL;
 444         ep = of_graph_get_endpoint_by_regs(host->dev->of_node, 0, 0);
 445         if (ep) {
 446                 ret = of_property_read_u32(ep, "data-lines", &priv->pd_lines);
 447
 448                 of_node_put(ep);
 449         }
 450
 451         if (ret)
 452                 priv->pd_lines = priv->dsi_bpp;
 453
 454         drm_bridge_add(&priv->bridge);
 455
 456         return 0;
 457 }
 458
 459 static int tc358768_dsi_host_detach(struct mipi_dsi_host *host,
 460                                     struct mipi_dsi_device *dev)
 461 {
 462         struct tc358768_priv *priv = dsi_host_to_tc358768(host);
 463
 464         drm_bridge_remove(&priv->bridge);
 465         if (priv->output.panel)
 466                 drm_panel_bridge_remove(priv->output.bridge);
 467
 468         return 0;
 469 }
 470
 471 static ssize_t tc358768_dsi_host_transfer(struct mipi_dsi_host *host,
 472                                           const struct mipi_dsi_msg *msg)
 473 {
 474         struct tc358768_priv *priv = dsi_host_to_tc358768(host);
 475         struct mipi_dsi_packet packet;
 476         int ret;
 477
 478         if (!priv->enabled) {
 479                 dev_err(priv->dev, "Bridge is not enabled\n");
 480                 return -ENODEV;
 481         }
 482
 483         if (msg->rx_len) {
 484                 dev_warn(priv->dev, "MIPI rx is not supported\n");
 485                 return -ENOTSUPP;
 486         }
 487
 488         if (msg->tx_len > 8) {
 489                 dev_warn(priv->dev, "Maximum 8 byte MIPI tx is supported\n");
 490                 return -ENOTSUPP;
 491         }
 492
 493         ret = mipi_dsi_create_packet(&packet, msg);
 494         if (ret)
 495                 return ret;
 496
 497         if (mipi_dsi_packet_format_is_short(msg->type)) {
 498                 tc358768_write(priv, TC358768_DSICMD_TYPE,
 499                                (0x10 << 8) | (packet.header[0] & 0x3f));
 500                 tc358768_write(priv, TC358768_DSICMD_WC, 0);
 501                 tc358768_write(priv, TC358768_DSICMD_WD0,
 502                                (packet.header[2] << 8) | packet.header[1]);
 503         } else {
 504                 int i;
 505
 506                 tc358768_write(priv, TC358768_DSICMD_TYPE,
 507                                (0x40 << 8) | (packet.header[0] & 0x3f));
 508                 tc358768_write(priv, TC358768_DSICMD_WC, packet.payload_length);
 509                 for (i = 0; i < packet.payload_length; i += 2) {
 510                         u16 val = packet.payload[i];
 511
 512                         if (i + 1 < packet.payload_length)
 513                                 val |= packet.payload[i + 1] << 8;
 514
 515                         tc358768_write(priv, TC358768_DSICMD_WD0 + i, val);
 516                 }
 517         }
 518
 519         /* start transfer */
 520         tc358768_write(priv, TC358768_DSICMD_TX, 1);
 521
 522         ret = tc358768_clear_error(priv);
 523         if (ret)
 524                 dev_warn(priv->dev, "Software disable failed: %d\n", ret);
 525         else
 526                 ret = packet.size;
 527
 528         return ret;
 529 }
 530
 531 static const struct mipi_dsi_host_ops tc358768_dsi_host_ops = {
 532         .attach = tc358768_dsi_host_attach,
 533         .detach = tc358768_dsi_host_detach,
 534         .transfer = tc358768_dsi_host_transfer,
 535 };
 536
 537 static int tc358768_bridge_attach(struct drm_bridge *bridge,
 538                                   enum drm_bridge_attach_flags flags)
 539 {
 540         struct tc358768_priv *priv = bridge_to_tc358768(bridge);
 541
 542         if (!drm_core_check_feature(bridge->dev, DRIVER_ATOMIC)) {
 543                 dev_err(priv->dev, "needs atomic updates support\n");
 544                 return -ENOTSUPP;
 545         }
 546
 547         return drm_bridge_attach(bridge->encoder, priv->output.bridge, bridge,
 548                                  flags);
 549 }
 550
 551 static enum drm_mode_status
 552 tc358768_bridge_mode_valid(struct drm_bridge *bridge,
 553                            const struct drm_display_info *info,
 554                            const struct drm_display_mode *mode)
 555 {
 556         struct tc358768_priv *priv = bridge_to_tc358768(bridge);
 557
 558         if (tc358768_calc_pll(priv, mode, true))
 559                 return MODE_CLOCK_RANGE;
 560
 561         return MODE_OK;
 562 }
 563
 564 static void tc358768_bridge_disable(struct drm_bridge *bridge)
 565 {
 566         struct tc358768_priv *priv = bridge_to_tc358768(bridge);
 567         int ret;
 568
 569         /* set FrmStop */
 570         tc358768_update_bits(priv, TC358768_PP_MISC, BIT(15), BIT(15));
 571
 572         /* wait at least for one frame */
 573         msleep(50);
 574
 575         /* clear PP_en */
 576         tc358768_update_bits(priv, TC358768_CONFCTL, BIT(6), 0);
 577
 578         /* set RstPtr */
 579         tc358768_update_bits(priv, TC358768_PP_MISC, BIT(14), BIT(14));
 580
 581         ret = tc358768_clear_error(priv);
 582         if (ret)
 583                 dev_warn(priv->dev, "Software disable failed: %d\n", ret);
 584 }
 585
 586 static void tc358768_bridge_post_disable(struct drm_bridge *bridge)
 587 {
 588         struct tc358768_priv *priv = bridge_to_tc358768(bridge);
 589
 590         tc358768_hw_disable(priv);
 591 }
 592
 593 static int tc358768_setup_pll(struct tc358768_priv *priv,
 594                               const struct drm_display_mode *mode)
 595 {
 596         u32 fbd, prd, frs;
 597         int ret;
 598
 599         ret = tc358768_calc_pll(priv, mode, false);
 600         if (ret) {
 601                 dev_err(priv->dev, "PLL calculation failed: %d\n", ret);
 602                 return ret;
 603         }
 604
 605         fbd = priv->fbd;
 606         prd = priv->prd;
 607         frs = priv->frs;
 608
 609         dev_dbg(priv->dev, "PLL: refclk %lu, fbd %u, prd %u, frs %u\n",
 610                 clk_get_rate(priv->refclk), fbd, prd, frs);
 611         dev_dbg(priv->dev, "PLL: pll_clk: %u, DSIClk %u, HSByteClk %u\n",
 612                 priv->dsiclk * 2, priv->dsiclk, priv->dsiclk / 4);
 613         dev_dbg(priv->dev, "PLL: pclk %u (panel: %u)\n",
 614                 tc358768_pll_to_pclk(priv, priv->dsiclk * 2),
 615                 mode->clock * 1000);
 616
 617         /* PRD[15:12] FBD[8:0] */
 618         tc358768_write(priv, TC358768_PLLCTL0, ((prd - 1) << 12) | (fbd - 1));
 619
 620         /* FRS[11:10] LBWS[9:8] CKEN[4] RESETB[1] EN[0] */
 621         tc358768_write(priv, TC358768_PLLCTL1,
 622                        (frs << 10) | (0x2 << 8) | BIT(1) | BIT(0));
 623
 624         /* wait for lock */
 625         usleep_range(1000, 2000);
 626
 627         /* FRS[11:10] LBWS[9:8] CKEN[4] PLL_CKEN[4] RESETB[1] EN[0] */
 628         tc358768_write(priv, TC358768_PLLCTL1,
 629                        (frs << 10) | (0x2 << 8) | BIT(4) | BIT(1) | BIT(0));
 630
 631         return tc358768_clear_error(priv);
 632 }
 633
 634 static u32 tc358768_ns_to_cnt(u32 ns, u32 period_ps)
 635 {
 636         return DIV_ROUND_UP(ns * 1000, period_ps);
 637 }
 638
 639 static u32 tc358768_ps_to_ns(u32 ps)
 640 {
 641         return ps / 1000;
 642 }
 643
 644 static u32 tc358768_dpi_to_ns(u32 val, u32 pclk)
 645 {
 646         return (u32)div_u64((u64)val * NANO, pclk);
 647 }
 648
 649 /* Convert value in DPI pixel clock units to DSI byte count */
 650 static u32 tc358768_dpi_to_dsi_bytes(struct tc358768_priv *priv, u32 val)
 651 {
 652         u64 m = (u64)val * priv->dsiclk / 4 * priv->dsi_lanes;
 653         u64 n = priv->pclk;
 654
 655         return (u32)div_u64(m + n - 1, n);
 656 }
 657
 658 static u32 tc358768_dsi_bytes_to_ns(struct tc358768_priv *priv, u32 val)
 659 {
 660         u64 m = (u64)val * NANO;
 661         u64 n = priv->dsiclk / 4 * priv->dsi_lanes;
 662
 663         return (u32)div_u64(m, n);
 664 }
 665
 666 static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
 667 {
 668         struct tc358768_priv *priv = bridge_to_tc358768(bridge);
 669         struct mipi_dsi_device *dsi_dev = priv->output.dev;
 670         unsigned long mode_flags = dsi_dev->mode_flags;
 671         u32 val, val2, lptxcnt, hact, data_type;
 672         s32 raw_val;
 673         const struct drm_display_mode *mode;
 674         u32 hsbyteclk_ps, dsiclk_ps, ui_ps;
 675         u32 dsiclk, hsbyteclk;
 676         int ret, i;
 677         struct videomode vm;
 678         struct device *dev = priv->dev;
 679         /* In pixelclock units */
 680         u32 dpi_htot, dpi_data_start;
 681         /* In byte units */
 682         u32 dsi_dpi_htot, dsi_dpi_data_start;
 683         u32 dsi_hsw, dsi_hbp, dsi_hact, dsi_hfp;
 684         const u32 dsi_hss = 4; /* HSS is a short packet (4 bytes) */
 685         /* In hsbyteclk units */
 686         u32 dsi_vsdly;
 687         const u32 internal_dly = 40;
 688
 689         if (mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) {
 690                 dev_warn_once(dev, "Non-continuous mode unimplemented, falling back to continuous\n");
 691                 mode_flags &= ~MIPI_DSI_CLOCK_NON_CONTINUOUS;
 692         }
 693
 694         tc358768_hw_enable(priv);
 695
 696         ret = tc358768_sw_reset(priv);
 697         if (ret) {
 698                 dev_err(dev, "Software reset failed: %d\n", ret);
 699                 tc358768_hw_disable(priv);
 700                 return;
 701         }
 702
 703         mode = &bridge->encoder->crtc->state->adjusted_mode;
 704         ret = tc358768_setup_pll(priv, mode);
 705         if (ret) {
 706                 dev_err(dev, "PLL setup failed: %d\n", ret);
 707                 tc358768_hw_disable(priv);
 708                 return;
 709         }
 710
 711         drm_display_mode_to_videomode(mode, &vm);
 712
 713         dsiclk = priv->dsiclk;
 714         hsbyteclk = dsiclk / 4;
 715
 716         /* Data Format Control Register */
 717         val = BIT(2) | BIT(1) | BIT(0); /* rdswap_en | dsitx_en | txdt_en */
 718         switch (dsi_dev->format) {
 719         case MIPI_DSI_FMT_RGB888:
 720                 val |= (0x3 << 4);
 721                 hact = vm.hactive * 3;
 722                 data_type = MIPI_DSI_PACKED_PIXEL_STREAM_24;
 723                 break;
 724         case MIPI_DSI_FMT_RGB666:
 725                 val |= (0x4 << 4);
 726                 hact = vm.hactive * 3;
 727                 data_type = MIPI_DSI_PACKED_PIXEL_STREAM_18;
 728                 break;
 729
 730         case MIPI_DSI_FMT_RGB666_PACKED:
 731                 val |= (0x4 << 4) | BIT(3);
 732                 hact = vm.hactive * 18 / 8;
 733                 data_type = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
 734                 break;
 735
 736         case MIPI_DSI_FMT_RGB565:
 737                 val |= (0x5 << 4);
 738                 hact = vm.hactive * 2;
 739                 data_type = MIPI_DSI_PACKED_PIXEL_STREAM_16;
 740                 break;
 741         default:
 742                 dev_err(dev, "Invalid data format (%u)\n",
 743                         dsi_dev->format);
 744                 tc358768_hw_disable(priv);
 745                 return;
 746         }
 747
 748         /*
 749          * There are three important things to make TC358768 work correctly,
 750          * which are not trivial to manage:
 751          *
 752          * 1. Keep the DPI line-time and the DSI line-time as close to each
 753          *    other as possible.
 754          * 2. TC358768 goes to LP mode after each line's active area. The DSI
 755          *    HFP period has to be long enough for entering and exiting LP mode.
 756          *    But it is not clear how to calculate this.
 757          * 3. VSDly (video start delay) has to be long enough to ensure that the
 758          *    DSI TX does not start transmitting until we have started receiving
 759          *    pixel data from the DPI input. It is not clear how to calculate
 760          *    this either.
 761          */
 762
 763         dpi_htot = vm.hactive + vm.hfront_porch + vm.hsync_len + vm.hback_porch;
 764         dpi_data_start = vm.hsync_len + vm.hback_porch;
 765
 766         dev_dbg(dev, "dpi horiz timing (pclk): %u + %u + %u + %u = %u\n",
 767                 vm.hsync_len, vm.hback_porch, vm.hactive, vm.hfront_porch,
 768                 dpi_htot);
 769
 770         dev_dbg(dev, "dpi horiz timing (ns): %u + %u + %u + %u = %u\n",
 771                 tc358768_dpi_to_ns(vm.hsync_len, vm.pixelclock),
 772                 tc358768_dpi_to_ns(vm.hback_porch, vm.pixelclock),
 773                 tc358768_dpi_to_ns(vm.hactive, vm.pixelclock),
 774                 tc358768_dpi_to_ns(vm.hfront_porch, vm.pixelclock),
 775                 tc358768_dpi_to_ns(dpi_htot, vm.pixelclock));
 776
 777         dev_dbg(dev, "dpi data start (ns): %u + %u = %u\n",
 778                 tc358768_dpi_to_ns(vm.hsync_len, vm.pixelclock),
 779                 tc358768_dpi_to_ns(vm.hback_porch, vm.pixelclock),
 780                 tc358768_dpi_to_ns(dpi_data_start, vm.pixelclock));
 781
 782         dsi_dpi_htot = tc358768_dpi_to_dsi_bytes(priv, dpi_htot);
 783         dsi_dpi_data_start = tc358768_dpi_to_dsi_bytes(priv, dpi_data_start);
 784
 785         if (dsi_dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
 786                 dsi_hsw = tc358768_dpi_to_dsi_bytes(priv, vm.hsync_len);
 787                 dsi_hbp = tc358768_dpi_to_dsi_bytes(priv, vm.hback_porch);
 788         } else {
 789                 /* HBP is included in HSW in event mode */
 790                 dsi_hbp = 0;
 791                 dsi_hsw = tc358768_dpi_to_dsi_bytes(priv,
 792                                                     vm.hsync_len +
 793                                                     vm.hback_porch);
 794
 795                 /*
 796                  * The pixel packet includes the actual pixel data, and:
 797                  * DSI packet header = 4 bytes
 798                  * DCS code = 1 byte
 799                  * DSI packet footer = 2 bytes
 800                  */
 801                 dsi_hact = hact + 4 + 1 + 2;
 802
 803                 dsi_hfp = dsi_dpi_htot - dsi_hact - dsi_hsw - dsi_hss;
 804
 805                 /*
 806                  * Here we should check if HFP is long enough for entering LP
 807                  * and exiting LP, but it's not clear how to calculate that.
 808                  * Instead, this is a naive algorithm that just adjusts the HFP
 809                  * and HSW so that HFP is (at least) roughly 2/3 of the total
 810                  * blanking time.
 811                  */
 812                 if (dsi_hfp < (dsi_hfp + dsi_hsw + dsi_hss) * 2 / 3) {
 813                         u32 old_hfp = dsi_hfp;
 814                         u32 old_hsw = dsi_hsw;
 815                         u32 tot = dsi_hfp + dsi_hsw + dsi_hss;
 816
 817                         dsi_hsw = tot / 3;
 818
 819                         /*
 820                          * Seems like sometimes HSW has to be divisible by num-lanes, but
 821                          * not always...
 822                          */
 823                         dsi_hsw = roundup(dsi_hsw, priv->dsi_lanes);
 824
 825                         dsi_hfp = dsi_dpi_htot - dsi_hact - dsi_hsw - dsi_hss;
 826
 827                         dev_dbg(dev,
 828                                 "hfp too short, adjusting dsi hfp and dsi hsw from %u, %u to %u, %u\n",
 829                                 old_hfp, old_hsw, dsi_hfp, dsi_hsw);
 830                 }
 831
 832                 dev_dbg(dev,
 833                         "dsi horiz timing (bytes): %u, %u + %u + %u + %u = %u\n",
 834                         dsi_hss, dsi_hsw, dsi_hbp, dsi_hact, dsi_hfp,
 835                         dsi_hss + dsi_hsw + dsi_hbp + dsi_hact + dsi_hfp);
 836
 837                 dev_dbg(dev, "dsi horiz timing (ns): %u + %u + %u + %u + %u = %u\n",
 838                         tc358768_dsi_bytes_to_ns(priv, dsi_hss),
 839                         tc358768_dsi_bytes_to_ns(priv, dsi_hsw),
 840                         tc358768_dsi_bytes_to_ns(priv, dsi_hbp),
 841                         tc358768_dsi_bytes_to_ns(priv, dsi_hact),
 842                         tc358768_dsi_bytes_to_ns(priv, dsi_hfp),
 843                         tc358768_dsi_bytes_to_ns(priv, dsi_hss + dsi_hsw +
 844                                                  dsi_hbp + dsi_hact + dsi_hfp));
 845         }
 846
 847         /* VSDly calculation */
 848
 849         /* Start with the HW internal delay */
 850         dsi_vsdly = internal_dly;
 851
 852         /* Convert to byte units as the other variables are in byte units */
 853         dsi_vsdly *= priv->dsi_lanes;
 854
 855         /* Do we need more delay, in addition to the internal? */
 856         if (dsi_dpi_data_start > dsi_vsdly + dsi_hss + dsi_hsw + dsi_hbp) {
 857                 dsi_vsdly = dsi_dpi_data_start - dsi_hss - dsi_hsw - dsi_hbp;
 858                 dsi_vsdly = roundup(dsi_vsdly, priv->dsi_lanes);
 859         }
 860
 861         dev_dbg(dev, "dsi data start (bytes) %u + %u + %u + %u = %u\n",
 862                 dsi_vsdly, dsi_hss, dsi_hsw, dsi_hbp,
 863                 dsi_vsdly + dsi_hss + dsi_hsw + dsi_hbp);
 864
 865         dev_dbg(dev, "dsi data start (ns) %u + %u + %u + %u = %u\n",
 866                 tc358768_dsi_bytes_to_ns(priv, dsi_vsdly),
 867                 tc358768_dsi_bytes_to_ns(priv, dsi_hss),
 868                 tc358768_dsi_bytes_to_ns(priv, dsi_hsw),
 869                 tc358768_dsi_bytes_to_ns(priv, dsi_hbp),
 870                 tc358768_dsi_bytes_to_ns(priv, dsi_vsdly + dsi_hss + dsi_hsw + dsi_hbp));
 871
 872         /* Convert back to hsbyteclk */
 873         dsi_vsdly /= priv->dsi_lanes;
 874
 875         /*
 876          * The docs say that there is an internal delay of 40 cycles.
 877          * However, we get underflows if we follow that rule. If we
 878          * instead ignore the internal delay, things work. So either
 879          * the docs are wrong or the calculations are wrong.
 880          *
 881          * As a temporary fix, add the internal delay here, to counter
 882          * the subtraction when writing the register.
 883          */
 884         dsi_vsdly += internal_dly;
 885
 886         /* Clamp to the register max */
 887         if (dsi_vsdly - internal_dly > 0x3ff) {
 888                 dev_warn(dev, "VSDly too high, underflows likely\n");
 889                 dsi_vsdly = 0x3ff + internal_dly;
 890         }
 891
 892         /* VSDly[9:0] */
 893         tc358768_write(priv, TC358768_VSDLY, dsi_vsdly - internal_dly);
 894
 895         tc358768_write(priv, TC358768_DATAFMT, val);
 896         tc358768_write(priv, TC358768_DSITX_DT, data_type);
 897
 898         /* Enable D-PHY (HiZ->LP11) */
 899         tc358768_write(priv, TC358768_CLW_CNTRL, 0x0000);
 900         /* Enable lanes */
 901         for (i = 0; i < dsi_dev->lanes; i++)
 902                 tc358768_write(priv, TC358768_D0W_CNTRL + i * 4, 0x0000);
 903
 904         /* DSI Timings */
 905         hsbyteclk_ps = (u32)div_u64(PICO, hsbyteclk);
 906         dsiclk_ps = (u32)div_u64(PICO, dsiclk);
 907         ui_ps = dsiclk_ps / 2;
 908         dev_dbg(dev, "dsiclk: %u ps, ui %u ps, hsbyteclk %u ps\n", dsiclk_ps,
 909                 ui_ps, hsbyteclk_ps);
 910
 911         /* LP11 > 100us for D-PHY Rx Init */
 912         val = tc358768_ns_to_cnt(100 * 1000, hsbyteclk_ps) - 1;
 913         dev_dbg(dev, "LINEINITCNT: %u\n", val);
 914         tc358768_write(priv, TC358768_LINEINITCNT, val);
 915
 916         /* LPTimeCnt > 50ns */
 917         val = tc358768_ns_to_cnt(50, hsbyteclk_ps) - 1;
 918         lptxcnt = val;
 919         dev_dbg(dev, "LPTXTIMECNT: %u\n", val);
 920         tc358768_write(priv, TC358768_LPTXTIMECNT, val);
 921
 922         /* 38ns < TCLK_PREPARE < 95ns */
 923         val = tc358768_ns_to_cnt(65, hsbyteclk_ps) - 1;
 924         dev_dbg(dev, "TCLK_PREPARECNT %u\n", val);
 925         /* TCLK_PREPARE + TCLK_ZERO > 300ns */
 926         val2 = tc358768_ns_to_cnt(300 - tc358768_ps_to_ns(2 * ui_ps),
 927                                   hsbyteclk_ps) - 2;
 928         dev_dbg(dev, "TCLK_ZEROCNT %u\n", val2);
 929         val |= val2 << 8;
 930         tc358768_write(priv, TC358768_TCLK_HEADERCNT, val);
 931
 932         /* TCLK_TRAIL > 60ns AND TEOT <= 105 ns + 12*UI */
 933         raw_val = tc358768_ns_to_cnt(60 + tc358768_ps_to_ns(2 * ui_ps), hsbyteclk_ps) - 5;
 934         val = clamp(raw_val, 0, 127);
 935         dev_dbg(dev, "TCLK_TRAILCNT: %u\n", val);
 936         tc358768_write(priv, TC358768_TCLK_TRAILCNT, val);
 937
 938         /* 40ns + 4*UI < THS_PREPARE < 85ns + 6*UI */
 939         val = 50 + tc358768_ps_to_ns(4 * ui_ps);
 940         val = tc358768_ns_to_cnt(val, hsbyteclk_ps) - 1;
 941         dev_dbg(dev, "THS_PREPARECNT %u\n", val);
 942         /* THS_PREPARE + THS_ZERO > 145ns + 10*UI */
 943         raw_val = tc358768_ns_to_cnt(145 - tc358768_ps_to_ns(3 * ui_ps), hsbyteclk_ps) - 10;
 944         val2 = clamp(raw_val, 0, 127);
 945         dev_dbg(dev, "THS_ZEROCNT %u\n", val2);
 946         val |= val2 << 8;
 947         tc358768_write(priv, TC358768_THS_HEADERCNT, val);
 948
 949         /* TWAKEUP > 1ms in lptxcnt steps */
 950         val = tc358768_ns_to_cnt(1020000, hsbyteclk_ps);
 951         val = val / (lptxcnt + 1) - 1;
 952         dev_dbg(dev, "TWAKEUP: %u\n", val);
 953         tc358768_write(priv, TC358768_TWAKEUP, val);
 954
 955         /* TCLK_POSTCNT > 60ns + 52*UI */
 956         val = tc358768_ns_to_cnt(60 + tc358768_ps_to_ns(52 * ui_ps),
 957                                  hsbyteclk_ps) - 3;
 958         dev_dbg(dev, "TCLK_POSTCNT: %u\n", val);
 959         tc358768_write(priv, TC358768_TCLK_POSTCNT, val);
 960
 961         /* max(60ns + 4*UI, 8*UI) < THS_TRAILCNT < 105ns + 12*UI */
 962         raw_val = tc358768_ns_to_cnt(60 + tc358768_ps_to_ns(18 * ui_ps),
 963                                      hsbyteclk_ps) - 4;
 964         val = clamp(raw_val, 0, 15);
 965         dev_dbg(dev, "THS_TRAILCNT: %u\n", val);
 966         tc358768_write(priv, TC358768_THS_TRAILCNT, val);
 967
 968         val = BIT(0);
 969         for (i = 0; i < dsi_dev->lanes; i++)
 970                 val |= BIT(i + 1);
 971         tc358768_write(priv, TC358768_HSTXVREGEN, val);
 972
 973         tc358768_write(priv, TC358768_TXOPTIONCNTRL,
 974                        (mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) ? 0 : BIT(0));
 975
 976         /* TXTAGOCNT[26:16] RXTASURECNT[10:0] */
 977         val = tc358768_ps_to_ns((lptxcnt + 1) * hsbyteclk_ps * 4);
 978         val = tc358768_ns_to_cnt(val, hsbyteclk_ps) / 4 - 1;
 979         dev_dbg(dev, "TXTAGOCNT: %u\n", val);
 980         val2 = tc358768_ns_to_cnt(tc358768_ps_to_ns((lptxcnt + 1) * hsbyteclk_ps),
 981                                   hsbyteclk_ps) - 2;
 982         dev_dbg(dev, "RXTASURECNT: %u\n", val2);
 983         val = val << 16 | val2;
 984         tc358768_write(priv, TC358768_BTACNTRL1, val);
 985
 986         /* START[0] */
 987         tc358768_write(priv, TC358768_STARTCNTRL, 1);
 988
 989         if (dsi_dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
 990                 /* Set pulse mode */
 991                 tc358768_write(priv, TC358768_DSI_EVENT, 0);
 992
 993                 /* vact */
 994                 tc358768_write(priv, TC358768_DSI_VACT, vm.vactive);
 995
 996                 /* vsw */
 997                 tc358768_write(priv, TC358768_DSI_VSW, vm.vsync_len);
 998
 999                 /* vbp */
1000                 tc358768_write(priv, TC358768_DSI_VBPR, vm.vback_porch);
1001         } else {
1002                 /* Set event mode */
1003                 tc358768_write(priv, TC358768_DSI_EVENT, 1);
1004
1005                 /* vact */
1006                 tc358768_write(priv, TC358768_DSI_VACT, vm.vactive);
1007
1008                 /* vsw (+ vbp) */
1009                 tc358768_write(priv, TC358768_DSI_VSW,
1010                                vm.vsync_len + vm.vback_porch);
1011
1012                 /* vbp (not used in event mode) */
1013                 tc358768_write(priv, TC358768_DSI_VBPR, 0);
1014         }
1015
1016         /* hsw (bytes) */
1017         tc358768_write(priv, TC358768_DSI_HSW, dsi_hsw);
1018
1019         /* hbp (bytes) */
1020         tc358768_write(priv, TC358768_DSI_HBPR, dsi_hbp);
1021
1022         /* hact (bytes) */
1023         tc358768_write(priv, TC358768_DSI_HACT, hact);
1024
1025         /* VSYNC polarity */
1026         tc358768_update_bits(priv, TC358768_CONFCTL, BIT(5),
1027                              (mode->flags & DRM_MODE_FLAG_PVSYNC) ? BIT(5) : 0);
1028
1029         /* HSYNC polarity */
1030         tc358768_update_bits(priv, TC358768_PP_MISC, BIT(0),
1031                              (mode->flags & DRM_MODE_FLAG_PHSYNC) ? BIT(0) : 0);
1032
1033         /* Start DSI Tx */
1034         tc358768_write(priv, TC358768_DSI_START, 0x1);
1035
1036         /* Configure DSI_Control register */
1037         val = TC358768_DSI_CONFW_MODE_CLR | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
1038         val |= TC358768_DSI_CONTROL_TXMD | TC358768_DSI_CONTROL_HSCKMD |
1039                0x3 << 1 | TC358768_DSI_CONTROL_EOTDIS;
1040         tc358768_write(priv, TC358768_DSI_CONFW, val);
1041
1042         val = TC358768_DSI_CONFW_MODE_SET | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
1043         val |= (dsi_dev->lanes - 1) << 1;
1044
1045         val |= TC358768_DSI_CONTROL_TXMD;
1046
1047         if (!(mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
1048                 val |= TC358768_DSI_CONTROL_HSCKMD;
1049
1050         if (dsi_dev->mode_flags & MIPI_DSI_MODE_NO_EOT_PACKET)
1051                 val |= TC358768_DSI_CONTROL_EOTDIS;
1052
1053         tc358768_write(priv, TC358768_DSI_CONFW, val);
1054
1055         val = TC358768_DSI_CONFW_MODE_CLR | TC358768_DSI_CONFW_ADDR_DSI_CONTROL;
1056         val |= TC358768_DSI_CONTROL_DIS_MODE; /* DSI mode */
1057         tc358768_write(priv, TC358768_DSI_CONFW, val);
1058
1059         ret = tc358768_clear_error(priv);
1060         if (ret) {
1061                 dev_err(dev, "Bridge pre_enable failed: %d\n", ret);
1062                 tc358768_bridge_disable(bridge);
1063                 tc358768_bridge_post_disable(bridge);
1064         }
1065 }
1066
1067 static void tc358768_bridge_enable(struct drm_bridge *bridge)
1068 {
1069         struct tc358768_priv *priv = bridge_to_tc358768(bridge);
1070         int ret;
1071
1072         if (!priv->enabled) {
1073                 dev_err(priv->dev, "Bridge is not enabled\n");
1074                 return;
1075         }
1076
1077         /* clear FrmStop and RstPtr */
1078         tc358768_update_bits(priv, TC358768_PP_MISC, 0x3 << 14, 0);
1079
1080         /* set PP_en */
1081         tc358768_update_bits(priv, TC358768_CONFCTL, BIT(6), BIT(6));
1082
1083         ret = tc358768_clear_error(priv);
1084         if (ret) {
1085                 dev_err(priv->dev, "Bridge enable failed: %d\n", ret);
1086                 tc358768_bridge_disable(bridge);
1087                 tc358768_bridge_post_disable(bridge);
1088         }
1089 }
1090
1091 #define MAX_INPUT_SEL_FORMATS   1
1092
1093 static u32 *
1094 tc358768_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
1095                                    struct drm_bridge_state *bridge_state,
1096                                    struct drm_crtc_state *crtc_state,
1097                                    struct drm_connector_state *conn_state,
1098                                    u32 output_fmt,
1099                                    unsigned int *num_input_fmts)
1100 {
1101         struct tc358768_priv *priv = bridge_to_tc358768(bridge);
1102         u32 *input_fmts;
1103
1104         *num_input_fmts = 0;
1105
1106         input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
1107                              GFP_KERNEL);
1108         if (!input_fmts)
1109                 return NULL;
1110
1111         switch (priv->pd_lines) {
1112         case 16:
1113                 input_fmts[0] = MEDIA_BUS_FMT_RGB565_1X16;
1114                 break;
1115         case 18:
1116                 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X18;
1117                 break;
1118         default:
1119         case 24:
1120                 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
1121                 break;
1122         }
1123
1124         *num_input_fmts = MAX_INPUT_SEL_FORMATS;
1125
1126         return input_fmts;
1127 }
1128
1129 static bool tc358768_mode_fixup(struct drm_bridge *bridge,
1130                                 const struct drm_display_mode *mode,
1131                                 struct drm_display_mode *adjusted_mode)
1132 {
1133         /* Default to positive sync */
1134
1135         if (!(adjusted_mode->flags &
1136               (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NHSYNC)))
1137                 adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
1138
1139         if (!(adjusted_mode->flags &
1140               (DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC)))
1141                 adjusted_mode->flags |= DRM_MODE_FLAG_PVSYNC;
1142
1143         return true;
1144 }
1145
1146 static const struct drm_bridge_funcs tc358768_bridge_funcs = {
1147         .attach = tc358768_bridge_attach,
1148         .mode_valid = tc358768_bridge_mode_valid,
1149         .mode_fixup = tc358768_mode_fixup,
1150         .pre_enable = tc358768_bridge_pre_enable,
1151         .enable = tc358768_bridge_enable,
1152         .disable = tc358768_bridge_disable,
1153         .post_disable = tc358768_bridge_post_disable,
1154
1155         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
1156         .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
1157         .atomic_reset = drm_atomic_helper_bridge_reset,
1158         .atomic_get_input_bus_fmts = tc358768_atomic_get_input_bus_fmts,
1159 };
1160
1161 static const struct drm_bridge_timings default_tc358768_timings = {
1162         .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
1163                  | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
1164                  | DRM_BUS_FLAG_DE_HIGH,
1165 };
1166
1167 static bool tc358768_is_reserved_reg(unsigned int reg)
1168 {
1169         switch (reg) {
1170         case 0x114 ... 0x13f:
1171         case 0x200:
1172         case 0x20c:
1173         case 0x400 ... 0x408:
1174         case 0x41c ... 0x42f:
1175                 return true;
1176         default:
1177                 return false;
1178         }
1179 }
1180
1181 static bool tc358768_writeable_reg(struct device *dev, unsigned int reg)
1182 {
1183         if (tc358768_is_reserved_reg(reg))
1184                 return false;
1185
1186         switch (reg) {
1187         case TC358768_CHIPID:
1188         case TC358768_FIFOSTATUS:
1189         case TC358768_DSITXSTATUS ... (TC358768_DSITXSTATUS + 2):
1190         case TC358768_DSI_CONTROL ... (TC358768_DSI_INT_ENA + 2):
1191         case TC358768_DSICMD_RDFIFO ... (TC358768_DSI_ERR_HALT + 2):
1192                 return false;
1193         default:
1194                 return true;
1195         }
1196 }
1197
1198 static bool tc358768_readable_reg(struct device *dev, unsigned int reg)
1199 {
1200         if (tc358768_is_reserved_reg(reg))
1201                 return false;
1202
1203         switch (reg) {
1204         case TC358768_STARTCNTRL:
1205         case TC358768_DSI_CONFW ... (TC358768_DSI_CONFW + 2):
1206         case TC358768_DSI_INT_CLR ... (TC358768_DSI_INT_CLR + 2):
1207         case TC358768_DSI_START ... (TC358768_DSI_START + 2):
1208         case TC358768_DBG_DATA:
1209                 return false;
1210         default:
1211                 return true;
1212         }
1213 }
1214
1215 static const struct regmap_config tc358768_regmap_config = {
1216         .name = "tc358768",
1217         .reg_bits = 16,
1218         .val_bits = 16,
1219         .max_register = TC358768_DSI_HACT,
1220         .cache_type = REGCACHE_NONE,
1221         .writeable_reg = tc358768_writeable_reg,
1222         .readable_reg = tc358768_readable_reg,
1223         .reg_format_endian = REGMAP_ENDIAN_BIG,
1224         .val_format_endian = REGMAP_ENDIAN_BIG,
1225 };
1226
1227 static const struct i2c_device_id tc358768_i2c_ids[] = {
1228         { "tc358768", 0 },
1229         { "tc358778", 0 },
1230         { }
1231 };
1232 MODULE_DEVICE_TABLE(i2c, tc358768_i2c_ids);
1233
1234 static const struct of_device_id tc358768_of_ids[] = {
1235         { .compatible = "toshiba,tc358768", },
1236         { .compatible = "toshiba,tc358778", },
1237         { }
1238 };
1239 MODULE_DEVICE_TABLE(of, tc358768_of_ids);
1240
1241 static int tc358768_get_regulators(struct tc358768_priv *priv)
1242 {
1243         int i, ret;
1244
1245         for (i = 0; i < ARRAY_SIZE(priv->supplies); ++i)
1246                 priv->supplies[i].supply = tc358768_supplies[i];
1247
1248         ret = devm_regulator_bulk_get(priv->dev, ARRAY_SIZE(priv->supplies),
1249                                       priv->supplies);
1250         if (ret < 0)
1251                 dev_err(priv->dev, "failed to get regulators: %d\n", ret);
1252
1253         return ret;
1254 }
1255
1256 static int tc358768_i2c_probe(struct i2c_client *client)
1257 {
1258         struct tc358768_priv *priv;
1259         struct device *dev = &client->dev;
1260         struct device_node *np = dev->of_node;
1261         int ret;
1262
1263         if (!np)
1264                 return -ENODEV;
1265
1266         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
1267         if (!priv)
1268                 return -ENOMEM;
1269
1270         dev_set_drvdata(dev, priv);
1271         priv->dev = dev;
1272
1273         ret = tc358768_get_regulators(priv);
1274         if (ret)
1275                 return ret;
1276
1277         priv->refclk = devm_clk_get(dev, "refclk");
1278         if (IS_ERR(priv->refclk))
1279                 return PTR_ERR(priv->refclk);
1280
1281         /*
1282          * RESX is low active, to disable tc358768 initially (keep in reset)
1283          * the gpio line must be LOW. This is the ASSERTED state of
1284          * GPIO_ACTIVE_LOW (GPIOD_OUT_HIGH == ASSERTED).
1285          */
1286         priv->reset_gpio  = devm_gpiod_get_optional(dev, "reset",
1287                                                     GPIOD_OUT_HIGH);
1288         if (IS_ERR(priv->reset_gpio))
1289                 return PTR_ERR(priv->reset_gpio);
1290
1291         priv->regmap = devm_regmap_init_i2c(client, &tc358768_regmap_config);
1292         if (IS_ERR(priv->regmap)) {
1293                 dev_err(dev, "Failed to init regmap\n");
1294                 return PTR_ERR(priv->regmap);
1295         }
1296
1297         priv->dsi_host.dev = dev;
1298         priv->dsi_host.ops = &tc358768_dsi_host_ops;
1299
1300         priv->bridge.funcs = &tc358768_bridge_funcs;
1301         priv->bridge.timings = &default_tc358768_timings;
1302         priv->bridge.of_node = np;
1303
1304         i2c_set_clientdata(client, priv);
1305
1306         return mipi_dsi_host_register(&priv->dsi_host);
1307 }
1308
1309 static void tc358768_i2c_remove(struct i2c_client *client)
1310 {
1311         struct tc358768_priv *priv = i2c_get_clientdata(client);
1312
1313         mipi_dsi_host_unregister(&priv->dsi_host);
1314 }
1315
1316 static struct i2c_driver tc358768_driver = {
1317         .driver = {
1318                 .name = "tc358768",
1319                 .of_match_table = tc358768_of_ids,
1320         },
1321         .id_table = tc358768_i2c_ids,
1322         .probe = tc358768_i2c_probe,
1323         .remove = tc358768_i2c_remove,
1324 };
1325 module_i2c_driver(tc358768_driver);
1326
1327 MODULE_AUTHOR("Peter Ujfalusi <[email protected]>");
1328 MODULE_DESCRIPTION("TC358768AXBG/TC358778XBG DSI bridge");
1329 MODULE_LICENSE("GPL v2");