drivers/gpu/drm/bridge/lontium-lt8912b.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2018, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/device.h>
   7 #include <linux/delay.h>
   8 #include <linux/gpio/consumer.h>
   9 #include <linux/i2c.h>
  10 #include <linux/media-bus-format.h>
  11 #include <linux/regmap.h>
  12
  13 #include <drm/drm_probe_helper.h>
  14 #include <drm/drm_atomic_helper.h>
  15 #include <drm/drm_edid.h>
  16 #include <drm/drm_mipi_dsi.h>
  17 #include <drm/drm_of.h>
  18
  19 #include <video/videomode.h>
  20
  21 #define I2C_MAIN 0
  22 #define I2C_ADDR_MAIN 0x48
  23
  24 #define I2C_CEC_DSI 1
  25 #define I2C_ADDR_CEC_DSI 0x49
  26
  27 #define I2C_MAX_IDX 2
  28
  29 struct lt8912 {
  30         struct device *dev;
  31         struct drm_bridge bridge;
  32         struct drm_connector connector;
  33
  34         struct i2c_client *i2c_client[I2C_MAX_IDX];
  35         struct regmap *regmap[I2C_MAX_IDX];
  36
  37         struct device_node *host_node;
  38         struct drm_bridge *hdmi_port;
  39
  40         struct mipi_dsi_device *dsi;
  41
  42         struct gpio_desc *gp_reset;
  43
  44         struct videomode mode;
  45
  46         struct regulator_bulk_data supplies[7];
  47
  48         u8 data_lanes;
  49         bool is_power_on;
  50 };
  51
  52 static int lt8912_write_init_config(struct lt8912 *lt)
  53 {
  54         const struct reg_sequence seq[] = {
  55                 /* Digital clock en*/
  56                 {0x08, 0xff},
  57                 {0x09, 0xff},
  58                 {0x0a, 0xff},
  59                 {0x0b, 0x7c},
  60                 {0x0c, 0xff},
  61                 {0x42, 0x04},
  62
  63                 /*Tx Analog*/
  64                 {0x31, 0xb1},
  65                 {0x32, 0xb1},
  66                 {0x33, 0x0e},
  67                 {0x37, 0x00},
  68                 {0x38, 0x22},
  69                 {0x60, 0x82},
  70
  71                 /*Cbus Analog*/
  72                 {0x39, 0x45},
  73                 {0x3a, 0x00},
  74                 {0x3b, 0x00},
  75
  76                 /*HDMI Pll Analog*/
  77                 {0x44, 0x31},
  78                 {0x55, 0x44},
  79                 {0x57, 0x01},
  80                 {0x5a, 0x02},
  81
  82                 /*MIPI Analog*/
  83                 {0x3e, 0xd6},
  84                 {0x3f, 0xd4},
  85                 {0x41, 0x3c},
  86                 {0xB2, 0x00},
  87         };
  88
  89         return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq));
  90 }
  91
  92 static int lt8912_write_mipi_basic_config(struct lt8912 *lt)
  93 {
  94         const struct reg_sequence seq[] = {
  95                 {0x12, 0x04},
  96                 {0x14, 0x00},
  97                 {0x15, 0x00},
  98                 {0x1a, 0x03},
  99                 {0x1b, 0x03},
 100         };
 101
 102         return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
 103 };
 104
 105 static int lt8912_write_dds_config(struct lt8912 *lt)
 106 {
 107         const struct reg_sequence seq[] = {
 108                 {0x4e, 0xff},
 109                 {0x4f, 0x56},
 110                 {0x50, 0x69},
 111                 {0x51, 0x80},
 112                 {0x1f, 0x5e},
 113                 {0x20, 0x01},
 114                 {0x21, 0x2c},
 115                 {0x22, 0x01},
 116                 {0x23, 0xfa},
 117                 {0x24, 0x00},
 118                 {0x25, 0xc8},
 119                 {0x26, 0x00},
 120                 {0x27, 0x5e},
 121                 {0x28, 0x01},
 122                 {0x29, 0x2c},
 123                 {0x2a, 0x01},
 124                 {0x2b, 0xfa},
 125                 {0x2c, 0x00},
 126                 {0x2d, 0xc8},
 127                 {0x2e, 0x00},
 128                 {0x42, 0x64},
 129                 {0x43, 0x00},
 130                 {0x44, 0x04},
 131                 {0x45, 0x00},
 132                 {0x46, 0x59},
 133                 {0x47, 0x00},
 134                 {0x48, 0xf2},
 135                 {0x49, 0x06},
 136                 {0x4a, 0x00},
 137                 {0x4b, 0x72},
 138                 {0x4c, 0x45},
 139                 {0x4d, 0x00},
 140                 {0x52, 0x08},
 141                 {0x53, 0x00},
 142                 {0x54, 0xb2},
 143                 {0x55, 0x00},
 144                 {0x56, 0xe4},
 145                 {0x57, 0x0d},
 146                 {0x58, 0x00},
 147                 {0x59, 0xe4},
 148                 {0x5a, 0x8a},
 149                 {0x5b, 0x00},
 150                 {0x5c, 0x34},
 151                 {0x1e, 0x4f},
 152                 {0x51, 0x00},
 153         };
 154
 155         return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
 156 }
 157
 158 static int lt8912_write_rxlogicres_config(struct lt8912 *lt)
 159 {
 160         int ret;
 161
 162         ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f);
 163         usleep_range(10000, 20000);
 164         ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff);
 165
 166         return ret;
 167 };
 168
 169 /* enable LVDS output with some hardcoded configuration, not required for the HDMI output */
 170 static int lt8912_write_lvds_config(struct lt8912 *lt)
 171 {
 172         const struct reg_sequence seq[] = {
 173                 // lvds power up
 174                 {0x44, 0x30},
 175                 {0x51, 0x05},
 176
 177                 // core pll bypass
 178                 {0x50, 0x24}, // cp=50uA
 179                 {0x51, 0x2d}, // Pix_clk as reference, second order passive LPF PLL
 180                 {0x52, 0x04}, // loopdiv=0, use second-order PLL
 181                 {0x69, 0x0e}, // CP_PRESET_DIV_RATIO
 182                 {0x69, 0x8e},
 183                 {0x6a, 0x00},
 184                 {0x6c, 0xb8}, // RGD_CP_SOFT_K_EN,RGD_CP_SOFT_K[13:8]
 185                 {0x6b, 0x51},
 186
 187                 {0x04, 0xfb}, // core pll reset
 188                 {0x04, 0xff},
 189
 190                 // scaler bypass
 191                 {0x7f, 0x00}, // disable scaler
 192                 {0xa8, 0x13}, // 0x13: JEIDA, 0x33: VESA
 193
 194                 {0x02, 0xf7}, // lvds pll reset
 195                 {0x02, 0xff},
 196                 {0x03, 0xcf},
 197                 {0x03, 0xff},
 198         };
 199
 200         return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq));
 201 };
 202
 203 static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b)
 204 {
 205         return container_of(b, struct lt8912, bridge);
 206 }
 207
 208 static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c)
 209 {
 210         return container_of(c, struct lt8912, connector);
 211 }
 212
 213 static const struct regmap_config lt8912_regmap_config = {
 214         .reg_bits = 8,
 215         .val_bits = 8,
 216         .max_register = 0xff,
 217 };
 218
 219 static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client)
 220 {
 221         unsigned int i;
 222         /*
 223          * At this time we only initialize 2 chips, but the lt8912 provides
 224          * a third interface for the audio over HDMI configuration.
 225          */
 226         struct i2c_board_info info[] = {
 227                 { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), },
 228                 { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), },
 229         };
 230
 231         if (!lt)
 232                 return -ENODEV;
 233
 234         for (i = 0; i < ARRAY_SIZE(info); i++) {
 235                 if (i > 0) {
 236                         lt->i2c_client[i] = i2c_new_dummy_device(client->adapter,
 237                                                                  info[i].addr);
 238                         if (IS_ERR(lt->i2c_client[i]))
 239                                 return PTR_ERR(lt->i2c_client[i]);
 240                 }
 241
 242                 lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i],
 243                                                      &lt8912_regmap_config);
 244                 if (IS_ERR(lt->regmap[i]))
 245                         return PTR_ERR(lt->regmap[i]);
 246         }
 247         return 0;
 248 }
 249
 250 static int lt8912_free_i2c(struct lt8912 *lt)
 251 {
 252         unsigned int i;
 253
 254         for (i = 1; i < I2C_MAX_IDX; i++)
 255                 i2c_unregister_device(lt->i2c_client[i]);
 256
 257         return 0;
 258 }
 259
 260 static int lt8912_hard_power_on(struct lt8912 *lt)
 261 {
 262         int ret;
 263
 264         ret = regulator_bulk_enable(ARRAY_SIZE(lt->supplies), lt->supplies);
 265         if (ret)
 266                 return ret;
 267
 268         gpiod_set_value_cansleep(lt->gp_reset, 0);
 269         msleep(20);
 270
 271         return 0;
 272 }
 273
 274 static void lt8912_hard_power_off(struct lt8912 *lt)
 275 {
 276         gpiod_set_value_cansleep(lt->gp_reset, 1);
 277         msleep(20);
 278
 279         regulator_bulk_disable(ARRAY_SIZE(lt->supplies), lt->supplies);
 280
 281         lt->is_power_on = false;
 282 }
 283
 284 static int lt8912_video_setup(struct lt8912 *lt)
 285 {
 286         u32 hactive, h_total, hpw, hfp, hbp;
 287         u32 vactive, v_total, vpw, vfp, vbp;
 288         u8 settle = 0x08;
 289         int ret, hsync_activehigh, vsync_activehigh;
 290
 291         if (!lt)
 292                 return -EINVAL;
 293
 294         hactive = lt->mode.hactive;
 295         hfp = lt->mode.hfront_porch;
 296         hpw = lt->mode.hsync_len;
 297         hbp = lt->mode.hback_porch;
 298         h_total = hactive + hfp + hpw + hbp;
 299         hsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH;
 300
 301         vactive = lt->mode.vactive;
 302         vfp = lt->mode.vfront_porch;
 303         vpw = lt->mode.vsync_len;
 304         vbp = lt->mode.vback_porch;
 305         v_total = vactive + vfp + vpw + vbp;
 306         vsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH;
 307
 308         if (vactive <= 600)
 309                 settle = 0x04;
 310         else if (vactive == 1080)
 311                 settle = 0x0a;
 312
 313         ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01);
 314         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle);
 315         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw);
 316         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw);
 317         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff);
 318         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8);
 319
 320         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c);
 321
 322         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff);
 323         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8);
 324
 325         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff);
 326         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8);
 327
 328         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff);
 329         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8);
 330
 331         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff);
 332         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8);
 333
 334         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff);
 335         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8);
 336
 337         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff);
 338         ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8);
 339
 340         ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(0),
 341                                   vsync_activehigh ? BIT(0) : 0);
 342         ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(1),
 343                                   hsync_activehigh ? BIT(1) : 0);
 344         ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xb2, BIT(0),
 345                                   lt->connector.display_info.is_hdmi ? BIT(0) : 0);
 346
 347         return ret;
 348 }
 349
 350 static int lt8912_soft_power_on(struct lt8912 *lt)
 351 {
 352         if (!lt->is_power_on) {
 353                 u32 lanes = lt->data_lanes;
 354
 355                 lt8912_write_init_config(lt);
 356                 regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3);
 357
 358                 lt8912_write_mipi_basic_config(lt);
 359
 360                 lt->is_power_on = true;
 361         }
 362
 363         return 0;
 364 }
 365
 366 static int lt8912_video_on(struct lt8912 *lt)
 367 {
 368         int ret;
 369
 370         ret = lt8912_video_setup(lt);
 371         if (ret < 0)
 372                 goto end;
 373
 374         ret = lt8912_write_dds_config(lt);
 375         if (ret < 0)
 376                 goto end;
 377
 378         ret = lt8912_write_rxlogicres_config(lt);
 379         if (ret < 0)
 380                 goto end;
 381
 382         ret = lt8912_write_lvds_config(lt);
 383         if (ret < 0)
 384                 goto end;
 385
 386 end:
 387         return ret;
 388 }
 389
 390 static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt)
 391 {
 392         int ret;
 393         unsigned int reg_val;
 394
 395         ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, &reg_val);
 396         if (ret)
 397                 return connector_status_unknown;
 398
 399         if (reg_val & BIT(7))
 400                 return connector_status_connected;
 401
 402         return connector_status_disconnected;
 403 }
 404
 405 static enum drm_connector_status
 406 lt8912_connector_detect(struct drm_connector *connector, bool force)
 407 {
 408         struct lt8912 *lt = connector_to_lt8912(connector);
 409
 410         if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)
 411                 return drm_bridge_detect(lt->hdmi_port);
 412
 413         return lt8912_check_cable_status(lt);
 414 }
 415
 416 static const struct drm_connector_funcs lt8912_connector_funcs = {
 417         .detect = lt8912_connector_detect,
 418         .fill_modes = drm_helper_probe_single_connector_modes,
 419         .destroy = drm_connector_cleanup,
 420         .reset = drm_atomic_helper_connector_reset,
 421         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 422         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 423 };
 424
 425 static enum drm_mode_status
 426 lt8912_connector_mode_valid(struct drm_connector *connector,
 427                             struct drm_display_mode *mode)
 428 {
 429         if (mode->clock > 150000)
 430                 return MODE_CLOCK_HIGH;
 431
 432         if (mode->hdisplay > 1920)
 433                 return MODE_BAD_HVALUE;
 434
 435         if (mode->vdisplay > 1080)
 436                 return MODE_BAD_VVALUE;
 437
 438         return MODE_OK;
 439 }
 440
 441 static int lt8912_connector_get_modes(struct drm_connector *connector)
 442 {
 443         struct edid *edid;
 444         int ret = -1;
 445         int num = 0;
 446         struct lt8912 *lt = connector_to_lt8912(connector);
 447         u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 448
 449         edid = drm_bridge_get_edid(lt->hdmi_port, connector);
 450         if (edid) {
 451                 drm_connector_update_edid_property(connector, edid);
 452                 num = drm_add_edid_modes(connector, edid);
 453         } else {
 454                 return ret;
 455         }
 456
 457         ret = drm_display_info_set_bus_formats(&connector->display_info,
 458                                                &bus_format, 1);
 459         if (ret)
 460                 num = ret;
 461
 462         kfree(edid);
 463         return num;
 464 }
 465
 466 static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = {
 467         .get_modes = lt8912_connector_get_modes,
 468         .mode_valid = lt8912_connector_mode_valid,
 469 };
 470
 471 static void lt8912_bridge_mode_set(struct drm_bridge *bridge,
 472                                    const struct drm_display_mode *mode,
 473                                    const struct drm_display_mode *adj)
 474 {
 475         struct lt8912 *lt = bridge_to_lt8912(bridge);
 476
 477         drm_display_mode_to_videomode(adj, &lt->mode);
 478 }
 479
 480 static void lt8912_bridge_enable(struct drm_bridge *bridge)
 481 {
 482         struct lt8912 *lt = bridge_to_lt8912(bridge);
 483
 484         lt8912_video_on(lt);
 485 }
 486
 487 static int lt8912_attach_dsi(struct lt8912 *lt)
 488 {
 489         struct device *dev = lt->dev;
 490         struct mipi_dsi_host *host;
 491         struct mipi_dsi_device *dsi;
 492         int ret = -1;
 493         const struct mipi_dsi_device_info info = { .type = "lt8912",
 494                                                    .channel = 0,
 495                                                    .node = NULL,
 496                                                  };
 497
 498         host = of_find_mipi_dsi_host_by_node(lt->host_node);
 499         if (!host) {
 500                 dev_err(dev, "failed to find dsi host\n");
 501                 return -EPROBE_DEFER;
 502         }
 503
 504         dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
 505         if (IS_ERR(dsi)) {
 506                 ret = PTR_ERR(dsi);
 507                 dev_err(dev, "failed to create dsi device (%d)\n", ret);
 508                 return ret;
 509         }
 510
 511         lt->dsi = dsi;
 512
 513         dsi->lanes = lt->data_lanes;
 514         dsi->format = MIPI_DSI_FMT_RGB888;
 515
 516         dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
 517                           MIPI_DSI_MODE_LPM |
 518                           MIPI_DSI_MODE_NO_EOT_PACKET;
 519
 520         ret = devm_mipi_dsi_attach(dev, dsi);
 521         if (ret < 0) {
 522                 dev_err(dev, "failed to attach dsi to host\n");
 523                 return ret;
 524         }
 525
 526         return 0;
 527 }
 528
 529 static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status)
 530 {
 531         struct lt8912 *lt = data;
 532
 533         if (lt->bridge.dev)
 534                 drm_helper_hpd_irq_event(lt->bridge.dev);
 535 }
 536
 537 static int lt8912_bridge_connector_init(struct drm_bridge *bridge)
 538 {
 539         int ret;
 540         struct lt8912 *lt = bridge_to_lt8912(bridge);
 541         struct drm_connector *connector = &lt->connector;
 542
 543         if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) {
 544                 drm_bridge_hpd_enable(lt->hdmi_port, lt8912_bridge_hpd_cb, lt);
 545                 connector->polled = DRM_CONNECTOR_POLL_HPD;
 546         } else {
 547                 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 548                                     DRM_CONNECTOR_POLL_DISCONNECT;
 549         }
 550
 551         ret = drm_connector_init(bridge->dev, connector,
 552                                  &lt8912_connector_funcs,
 553                                  lt->hdmi_port->type);
 554         if (ret)
 555                 goto exit;
 556
 557         drm_connector_helper_add(connector, &lt8912_connector_helper_funcs);
 558
 559         connector->dpms = DRM_MODE_DPMS_OFF;
 560         drm_connector_attach_encoder(connector, bridge->encoder);
 561
 562 exit:
 563         return ret;
 564 }
 565
 566 static int lt8912_bridge_attach(struct drm_bridge *bridge,
 567                                 enum drm_bridge_attach_flags flags)
 568 {
 569         struct lt8912 *lt = bridge_to_lt8912(bridge);
 570         int ret;
 571
 572         ret = drm_bridge_attach(bridge->encoder, lt->hdmi_port, bridge,
 573                                 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 574         if (ret < 0) {
 575                 dev_err(lt->dev, "Failed to attach next bridge (%d)\n", ret);
 576                 return ret;
 577         }
 578
 579         if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
 580                 ret = lt8912_bridge_connector_init(bridge);
 581                 if (ret) {
 582                         dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret);
 583                         return ret;
 584                 }
 585         }
 586
 587         ret = lt8912_hard_power_on(lt);
 588         if (ret)
 589                 return ret;
 590
 591         ret = lt8912_soft_power_on(lt);
 592         if (ret)
 593                 goto error;
 594
 595         return 0;
 596
 597 error:
 598         lt8912_hard_power_off(lt);
 599         return ret;
 600 }
 601
 602 static void lt8912_bridge_detach(struct drm_bridge *bridge)
 603 {
 604         struct lt8912 *lt = bridge_to_lt8912(bridge);
 605
 606         lt8912_hard_power_off(lt);
 607
 608         if (lt->connector.dev && lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD)
 609                 drm_bridge_hpd_disable(lt->hdmi_port);
 610 }
 611
 612 static enum drm_connector_status
 613 lt8912_bridge_detect(struct drm_bridge *bridge)
 614 {
 615         struct lt8912 *lt = bridge_to_lt8912(bridge);
 616
 617         if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)
 618                 return drm_bridge_detect(lt->hdmi_port);
 619
 620         return lt8912_check_cable_status(lt);
 621 }
 622
 623 static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge,
 624                                            struct drm_connector *connector)
 625 {
 626         struct lt8912 *lt = bridge_to_lt8912(bridge);
 627
 628         /*
 629          * edid must be read through the ddc bus but it must be
 630          * given to the hdmi connector node.
 631          */
 632         if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID)
 633                 return drm_bridge_get_edid(lt->hdmi_port, connector);
 634
 635         dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n");
 636         return NULL;
 637 }
 638
 639 static const struct drm_bridge_funcs lt8912_bridge_funcs = {
 640         .attach = lt8912_bridge_attach,
 641         .detach = lt8912_bridge_detach,
 642         .mode_set = lt8912_bridge_mode_set,
 643         .enable = lt8912_bridge_enable,
 644         .detect = lt8912_bridge_detect,
 645         .get_edid = lt8912_bridge_get_edid,
 646 };
 647
 648 static int lt8912_bridge_resume(struct device *dev)
 649 {
 650         struct lt8912 *lt = dev_get_drvdata(dev);
 651         int ret;
 652
 653         ret = lt8912_hard_power_on(lt);
 654         if (ret)
 655                 return ret;
 656
 657         ret = lt8912_soft_power_on(lt);
 658         if (ret)
 659                 return ret;
 660
 661         return lt8912_video_on(lt);
 662 }
 663
 664 static int lt8912_bridge_suspend(struct device *dev)
 665 {
 666         struct lt8912 *lt = dev_get_drvdata(dev);
 667
 668         lt8912_hard_power_off(lt);
 669
 670         return 0;
 671 }
 672
 673 static DEFINE_SIMPLE_DEV_PM_OPS(lt8912_bridge_pm_ops, lt8912_bridge_suspend, lt8912_bridge_resume);
 674
 675 static int lt8912_get_regulators(struct lt8912 *lt)
 676 {
 677         unsigned int i;
 678         const char * const supply_names[] = {
 679                 "vdd", "vccmipirx", "vccsysclk", "vcclvdstx",
 680                 "vcchdmitx", "vcclvdspll", "vcchdmipll"
 681         };
 682
 683         for (i = 0; i < ARRAY_SIZE(lt->supplies); i++)
 684                 lt->supplies[i].supply = supply_names[i];
 685
 686         return devm_regulator_bulk_get(lt->dev, ARRAY_SIZE(lt->supplies),
 687                                        lt->supplies);
 688 }
 689
 690 static int lt8912_parse_dt(struct lt8912 *lt)
 691 {
 692         struct gpio_desc *gp_reset;
 693         struct device *dev = lt->dev;
 694         int ret;
 695         int data_lanes;
 696         struct device_node *port_node;
 697
 698         gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
 699         if (IS_ERR(gp_reset)) {
 700                 ret = PTR_ERR(gp_reset);
 701                 if (ret != -EPROBE_DEFER)
 702                         dev_err(dev, "Failed to get reset gpio: %d\n", ret);
 703                 return ret;
 704         }
 705         lt->gp_reset = gp_reset;
 706
 707         data_lanes = drm_of_get_data_lanes_count_ep(dev->of_node, 0, -1, 1, 4);
 708         if (data_lanes < 0) {
 709                 dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__);
 710                 return data_lanes;
 711         }
 712
 713         lt->data_lanes = data_lanes;
 714
 715         lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1);
 716         if (!lt->host_node) {
 717                 dev_err(lt->dev, "%s: Failed to get remote port\n", __func__);
 718                 return -ENODEV;
 719         }
 720
 721         port_node = of_graph_get_remote_node(dev->of_node, 1, -1);
 722         if (!port_node) {
 723                 dev_err(lt->dev, "%s: Failed to get connector port\n", __func__);
 724                 ret = -ENODEV;
 725                 goto err_free_host_node;
 726         }
 727
 728         lt->hdmi_port = of_drm_find_bridge(port_node);
 729         if (!lt->hdmi_port) {
 730                 ret = -EPROBE_DEFER;
 731                 dev_err_probe(lt->dev, ret, "%s: Failed to get hdmi port\n", __func__);
 732                 goto err_free_host_node;
 733         }
 734
 735         if (!of_device_is_compatible(port_node, "hdmi-connector")) {
 736                 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
 737                 ret = -EINVAL;
 738                 goto err_free_host_node;
 739         }
 740
 741         ret = lt8912_get_regulators(lt);
 742         if (ret)
 743                 goto err_free_host_node;
 744
 745         of_node_put(port_node);
 746         return 0;
 747
 748 err_free_host_node:
 749         of_node_put(port_node);
 750         of_node_put(lt->host_node);
 751         return ret;
 752 }
 753
 754 static int lt8912_put_dt(struct lt8912 *lt)
 755 {
 756         of_node_put(lt->host_node);
 757         return 0;
 758 }
 759
 760 static int lt8912_probe(struct i2c_client *client)
 761 {
 762         static struct lt8912 *lt;
 763         int ret = 0;
 764         struct device *dev = &client->dev;
 765
 766         lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL);
 767         if (!lt)
 768                 return -ENOMEM;
 769
 770         lt->dev = dev;
 771         lt->i2c_client[0] = client;
 772
 773         ret = lt8912_parse_dt(lt);
 774         if (ret)
 775                 goto err_dt_parse;
 776
 777         ret = lt8912_init_i2c(lt, client);
 778         if (ret)
 779                 goto err_i2c;
 780
 781         i2c_set_clientdata(client, lt);
 782
 783         lt->bridge.funcs = &lt8912_bridge_funcs;
 784         lt->bridge.of_node = dev->of_node;
 785         lt->bridge.ops = (DRM_BRIDGE_OP_EDID |
 786                           DRM_BRIDGE_OP_DETECT);
 787
 788         drm_bridge_add(&lt->bridge);
 789
 790         ret = lt8912_attach_dsi(lt);
 791         if (ret)
 792                 goto err_attach;
 793
 794         return 0;
 795
 796 err_attach:
 797         drm_bridge_remove(&lt->bridge);
 798         lt8912_free_i2c(lt);
 799 err_i2c:
 800         lt8912_put_dt(lt);
 801 err_dt_parse:
 802         return ret;
 803 }
 804
 805 static void lt8912_remove(struct i2c_client *client)
 806 {
 807         struct lt8912 *lt = i2c_get_clientdata(client);
 808
 809         drm_bridge_remove(&lt->bridge);
 810         lt8912_free_i2c(lt);
 811         lt8912_put_dt(lt);
 812 }
 813
 814 static const struct of_device_id lt8912_dt_match[] = {
 815         {.compatible = "lontium,lt8912b"},
 816         {}
 817 };
 818 MODULE_DEVICE_TABLE(of, lt8912_dt_match);
 819
 820 static const struct i2c_device_id lt8912_id[] = {
 821         {"lt8912", 0},
 822         {},
 823 };
 824 MODULE_DEVICE_TABLE(i2c, lt8912_id);
 825
 826 static struct i2c_driver lt8912_i2c_driver = {
 827         .driver = {
 828                 .name = "lt8912",
 829                 .of_match_table = lt8912_dt_match,
 830                 .pm = pm_sleep_ptr(&lt8912_bridge_pm_ops),
 831         },
 832         .probe = lt8912_probe,
 833         .remove = lt8912_remove,
 834         .id_table = lt8912_id,
 835 };
 836 module_i2c_driver(lt8912_i2c_driver);
 837
 838 MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>");
 839 MODULE_DESCRIPTION("lt8912 drm driver");
 840 MODULE_LICENSE("GPL v2");