drivers/gpu/drm/bridge/lontium-lt9611.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2018, The Linux Foundation. All rights reserved.
   4  * Copyright (c) 2019-2020. Linaro Limited.
   5  */
   6
   7 #include <linux/gpio/consumer.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/module.h>
  10 #include <linux/of_graph.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/regmap.h>
  13 #include <linux/regulator/consumer.h>
  14
  15 #include <sound/hdmi-codec.h>
  16
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_bridge.h>
  19 #include <drm/drm_mipi_dsi.h>
  20 #include <drm/drm_print.h>
  21 #include <drm/drm_probe_helper.h>
  22
  23 #define EDID_SEG_SIZE   256
  24 #define EDID_LEN        32
  25 #define EDID_LOOP       8
  26 #define KEY_DDC_ACCS_DONE 0x02
  27 #define DDC_NO_ACK      0x50
  28
  29 #define LT9611_4LANES   0
  30
  31 struct lt9611 {
  32         struct device *dev;
  33         struct drm_bridge bridge;
  34         struct drm_connector connector;
  35
  36         struct regmap *regmap;
  37
  38         struct device_node *dsi0_node;
  39         struct device_node *dsi1_node;
  40         struct mipi_dsi_device *dsi0;
  41         struct mipi_dsi_device *dsi1;
  42         struct platform_device *audio_pdev;
  43
  44         bool ac_mode;
  45
  46         struct gpio_desc *reset_gpio;
  47         struct gpio_desc *enable_gpio;
  48
  49         bool power_on;
  50         bool sleep;
  51
  52         struct regulator_bulk_data supplies[2];
  53
  54         struct i2c_client *client;
  55
  56         enum drm_connector_status status;
  57
  58         u8 edid_buf[EDID_SEG_SIZE];
  59         u32 vic;
  60 };
  61
  62 #define LT9611_PAGE_CONTROL     0xff
  63
  64 static const struct regmap_range_cfg lt9611_ranges[] = {
  65         {
  66                 .name = "register_range",
  67                 .range_min =  0,
  68                 .range_max = 0x85ff,
  69                 .selector_reg = LT9611_PAGE_CONTROL,
  70                 .selector_mask = 0xff,
  71                 .selector_shift = 0,
  72                 .window_start = 0,
  73                 .window_len = 0x100,
  74         },
  75 };
  76
  77 static const struct regmap_config lt9611_regmap_config = {
  78         .reg_bits = 8,
  79         .val_bits = 8,
  80         .max_register = 0xffff,
  81         .ranges = lt9611_ranges,
  82         .num_ranges = ARRAY_SIZE(lt9611_ranges),
  83 };
  84
  85 struct lt9611_mode {
  86         u16 hdisplay;
  87         u16 vdisplay;
  88         u8 vrefresh;
  89         u8 lanes;
  90         u8 intfs;
  91 };
  92
  93 static struct lt9611_mode lt9611_modes[] = {
  94         { 3840, 2160, 30, 4, 2 }, /* 3840x2160 24bit 30Hz 4Lane 2ports */
  95         { 1920, 1080, 60, 4, 1 }, /* 1080P 24bit 60Hz 4lane 1port */
  96         { 1920, 1080, 30, 3, 1 }, /* 1080P 24bit 30Hz 3lane 1port */
  97         { 1920, 1080, 24, 3, 1 },
  98         { 720, 480, 60, 4, 1 },
  99         { 720, 576, 50, 2, 1 },
 100         { 640, 480, 60, 2, 1 },
 101 };
 102
 103 static struct lt9611 *bridge_to_lt9611(struct drm_bridge *bridge)
 104 {
 105         return container_of(bridge, struct lt9611, bridge);
 106 }
 107
 108 static struct lt9611 *connector_to_lt9611(struct drm_connector *connector)
 109 {
 110         return container_of(connector, struct lt9611, connector);
 111 }
 112
 113 static int lt9611_mipi_input_analog(struct lt9611 *lt9611)
 114 {
 115         const struct reg_sequence reg_cfg[] = {
 116                 { 0x8106, 0x40 }, /* port A rx current */
 117                 { 0x810a, 0xfe }, /* port A ldo voltage set */
 118                 { 0x810b, 0xbf }, /* enable port A lprx */
 119                 { 0x8111, 0x40 }, /* port B rx current */
 120                 { 0x8115, 0xfe }, /* port B ldo voltage set */
 121                 { 0x8116, 0xbf }, /* enable port B lprx */
 122
 123                 { 0x811c, 0x03 }, /* PortA clk lane no-LP mode */
 124                 { 0x8120, 0x03 }, /* PortB clk lane with-LP mode */
 125         };
 126
 127         return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 128 }
 129
 130 static int lt9611_mipi_input_digital(struct lt9611 *lt9611,
 131                                      const struct drm_display_mode *mode)
 132 {
 133         struct reg_sequence reg_cfg[] = {
 134                 { 0x8300, LT9611_4LANES },
 135                 { 0x830a, 0x00 },
 136                 { 0x824f, 0x80 },
 137                 { 0x8250, 0x10 },
 138                 { 0x8302, 0x0a },
 139                 { 0x8306, 0x0a },
 140         };
 141
 142         if (mode->hdisplay == 3840)
 143                 reg_cfg[1].def = 0x03;
 144
 145         return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 146 }
 147
 148 static void lt9611_mipi_video_setup(struct lt9611 *lt9611,
 149                                     const struct drm_display_mode *mode)
 150 {
 151         u32 h_total, hactive, hsync_len, hfront_porch, hsync_porch;
 152         u32 v_total, vactive, vsync_len, vfront_porch, vsync_porch;
 153
 154         h_total = mode->htotal;
 155         v_total = mode->vtotal;
 156
 157         hactive = mode->hdisplay;
 158         hsync_len = mode->hsync_end - mode->hsync_start;
 159         hfront_porch = mode->hsync_start - mode->hdisplay;
 160         hsync_porch = hsync_len + mode->htotal - mode->hsync_end;
 161
 162         vactive = mode->vdisplay;
 163         vsync_len = mode->vsync_end - mode->vsync_start;
 164         vfront_porch = mode->vsync_start - mode->vdisplay;
 165         vsync_porch = vsync_len + mode->vtotal - mode->vsync_end;
 166
 167         regmap_write(lt9611->regmap, 0x830d, (u8)(v_total / 256));
 168         regmap_write(lt9611->regmap, 0x830e, (u8)(v_total % 256));
 169
 170         regmap_write(lt9611->regmap, 0x830f, (u8)(vactive / 256));
 171         regmap_write(lt9611->regmap, 0x8310, (u8)(vactive % 256));
 172
 173         regmap_write(lt9611->regmap, 0x8311, (u8)(h_total / 256));
 174         regmap_write(lt9611->regmap, 0x8312, (u8)(h_total % 256));
 175
 176         regmap_write(lt9611->regmap, 0x8313, (u8)(hactive / 256));
 177         regmap_write(lt9611->regmap, 0x8314, (u8)(hactive % 256));
 178
 179         regmap_write(lt9611->regmap, 0x8315, (u8)(vsync_len % 256));
 180         regmap_write(lt9611->regmap, 0x8316, (u8)(hsync_len % 256));
 181
 182         regmap_write(lt9611->regmap, 0x8317, (u8)(vfront_porch % 256));
 183
 184         regmap_write(lt9611->regmap, 0x8318, (u8)(vsync_porch % 256));
 185
 186         regmap_write(lt9611->regmap, 0x8319, (u8)(hfront_porch % 256));
 187
 188         regmap_write(lt9611->regmap, 0x831a, (u8)(hsync_porch / 256));
 189         regmap_write(lt9611->regmap, 0x831b, (u8)(hsync_porch % 256));
 190 }
 191
 192 static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode)
 193 {
 194         const struct reg_sequence reg_cfg[] = {
 195                 { 0x830b, 0x01 },
 196                 { 0x830c, 0x10 },
 197                 { 0x8348, 0x00 },
 198                 { 0x8349, 0x81 },
 199
 200                 /* stage 1 */
 201                 { 0x8321, 0x4a },
 202                 { 0x8324, 0x71 },
 203                 { 0x8325, 0x30 },
 204                 { 0x832a, 0x01 },
 205
 206                 /* stage 2 */
 207                 { 0x834a, 0x40 },
 208                 { 0x831d, 0x10 },
 209
 210                 /* MK limit */
 211                 { 0x832d, 0x38 },
 212                 { 0x8331, 0x08 },
 213         };
 214         const struct reg_sequence reg_cfg2[] = {
 215                 { 0x830b, 0x03 },
 216                 { 0x830c, 0xd0 },
 217                 { 0x8348, 0x03 },
 218                 { 0x8349, 0xe0 },
 219                 { 0x8324, 0x72 },
 220                 { 0x8325, 0x00 },
 221                 { 0x832a, 0x01 },
 222                 { 0x834a, 0x10 },
 223                 { 0x831d, 0x10 },
 224                 { 0x8326, 0x37 },
 225         };
 226
 227         regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 228
 229         switch (mode->hdisplay) {
 230         case 640:
 231                 regmap_write(lt9611->regmap, 0x8326, 0x14);
 232                 break;
 233         case 1920:
 234                 regmap_write(lt9611->regmap, 0x8326, 0x37);
 235                 break;
 236         case 3840:
 237                 regmap_multi_reg_write(lt9611->regmap, reg_cfg2, ARRAY_SIZE(reg_cfg2));
 238                 break;
 239         }
 240
 241         /* pcr rst */
 242         regmap_write(lt9611->regmap, 0x8011, 0x5a);
 243         regmap_write(lt9611->regmap, 0x8011, 0xfa);
 244 }
 245
 246 static int lt9611_pll_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode)
 247 {
 248         unsigned int pclk = mode->clock;
 249         const struct reg_sequence reg_cfg[] = {
 250                 /* txpll init */
 251                 { 0x8123, 0x40 },
 252                 { 0x8124, 0x64 },
 253                 { 0x8125, 0x80 },
 254                 { 0x8126, 0x55 },
 255                 { 0x812c, 0x37 },
 256                 { 0x812f, 0x01 },
 257                 { 0x8126, 0x55 },
 258                 { 0x8127, 0x66 },
 259                 { 0x8128, 0x88 },
 260         };
 261
 262         regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 263
 264         if (pclk > 150000)
 265                 regmap_write(lt9611->regmap, 0x812d, 0x88);
 266         else if (pclk > 70000)
 267                 regmap_write(lt9611->regmap, 0x812d, 0x99);
 268         else
 269                 regmap_write(lt9611->regmap, 0x812d, 0xaa);
 270
 271         /*
 272          * first divide pclk by 2 first
 273          *  - write divide by 64k to 19:16 bits which means shift by 17
 274          *  - write divide by 256 to 15:8 bits which means shift by 9
 275          *  - write remainder to 7:0 bits, which means shift by 1
 276          */
 277         regmap_write(lt9611->regmap, 0x82e3, pclk >> 17); /* pclk[19:16] */
 278         regmap_write(lt9611->regmap, 0x82e4, pclk >> 9);  /* pclk[15:8]  */
 279         regmap_write(lt9611->regmap, 0x82e5, pclk >> 1);  /* pclk[7:0]   */
 280
 281         regmap_write(lt9611->regmap, 0x82de, 0x20);
 282         regmap_write(lt9611->regmap, 0x82de, 0xe0);
 283
 284         regmap_write(lt9611->regmap, 0x8016, 0xf1);
 285         regmap_write(lt9611->regmap, 0x8016, 0xf3);
 286
 287         return 0;
 288 }
 289
 290 static int lt9611_read_video_check(struct lt9611 *lt9611, unsigned int reg)
 291 {
 292         unsigned int temp, temp2;
 293         int ret;
 294
 295         ret = regmap_read(lt9611->regmap, reg, &temp);
 296         if (ret)
 297                 return ret;
 298         temp <<= 8;
 299         ret = regmap_read(lt9611->regmap, reg + 1, &temp2);
 300         if (ret)
 301                 return ret;
 302
 303         return (temp + temp2);
 304 }
 305
 306 static int lt9611_video_check(struct lt9611 *lt9611)
 307 {
 308         u32 v_total, vactive, hactive_a, hactive_b, h_total_sysclk;
 309         int temp;
 310
 311         /* top module video check */
 312
 313         /* vactive */
 314         temp = lt9611_read_video_check(lt9611, 0x8282);
 315         if (temp < 0)
 316                 goto end;
 317         vactive = temp;
 318
 319         /* v_total */
 320         temp = lt9611_read_video_check(lt9611, 0x826c);
 321         if (temp < 0)
 322                 goto end;
 323         v_total = temp;
 324
 325         /* h_total_sysclk */
 326         temp = lt9611_read_video_check(lt9611, 0x8286);
 327         if (temp < 0)
 328                 goto end;
 329         h_total_sysclk = temp;
 330
 331         /* hactive_a */
 332         temp = lt9611_read_video_check(lt9611, 0x8382);
 333         if (temp < 0)
 334                 goto end;
 335         hactive_a = temp / 3;
 336
 337         /* hactive_b */
 338         temp = lt9611_read_video_check(lt9611, 0x8386);
 339         if (temp < 0)
 340                 goto end;
 341         hactive_b = temp / 3;
 342
 343         dev_info(lt9611->dev,
 344                  "video check: hactive_a=%d, hactive_b=%d, vactive=%d, v_total=%d, h_total_sysclk=%d\n",
 345                  hactive_a, hactive_b, vactive, v_total, h_total_sysclk);
 346
 347         return 0;
 348
 349 end:
 350         dev_err(lt9611->dev, "read video check error\n");
 351         return temp;
 352 }
 353
 354 static void lt9611_hdmi_tx_digital(struct lt9611 *lt9611)
 355 {
 356         regmap_write(lt9611->regmap, 0x8443, 0x46 - lt9611->vic);
 357         regmap_write(lt9611->regmap, 0x8447, lt9611->vic);
 358         regmap_write(lt9611->regmap, 0x843d, 0x0a); /* UD1 infoframe */
 359
 360         regmap_write(lt9611->regmap, 0x82d6, 0x8c);
 361         regmap_write(lt9611->regmap, 0x82d7, 0x04);
 362 }
 363
 364 static void lt9611_hdmi_tx_phy(struct lt9611 *lt9611)
 365 {
 366         struct reg_sequence reg_cfg[] = {
 367                 { 0x8130, 0x6a },
 368                 { 0x8131, 0x44 }, /* HDMI DC mode */
 369                 { 0x8132, 0x4a },
 370                 { 0x8133, 0x0b },
 371                 { 0x8134, 0x00 },
 372                 { 0x8135, 0x00 },
 373                 { 0x8136, 0x00 },
 374                 { 0x8137, 0x44 },
 375                 { 0x813f, 0x0f },
 376                 { 0x8140, 0xa0 },
 377                 { 0x8141, 0xa0 },
 378                 { 0x8142, 0xa0 },
 379                 { 0x8143, 0xa0 },
 380                 { 0x8144, 0x0a },
 381         };
 382
 383         /* HDMI AC mode */
 384         if (lt9611->ac_mode)
 385                 reg_cfg[2].def = 0x73;
 386
 387         regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 388 }
 389
 390 static irqreturn_t lt9611_irq_thread_handler(int irq, void *dev_id)
 391 {
 392         struct lt9611 *lt9611 = dev_id;
 393         unsigned int irq_flag0 = 0;
 394         unsigned int irq_flag3 = 0;
 395
 396         regmap_read(lt9611->regmap, 0x820f, &irq_flag3);
 397         regmap_read(lt9611->regmap, 0x820c, &irq_flag0);
 398
 399         /* hpd changed low */
 400         if (irq_flag3 & 0x80) {
 401                 dev_info(lt9611->dev, "hdmi cable disconnected\n");
 402
 403                 regmap_write(lt9611->regmap, 0x8207, 0xbf);
 404                 regmap_write(lt9611->regmap, 0x8207, 0x3f);
 405         }
 406
 407         /* hpd changed high */
 408         if (irq_flag3 & 0x40) {
 409                 dev_info(lt9611->dev, "hdmi cable connected\n");
 410
 411                 regmap_write(lt9611->regmap, 0x8207, 0x7f);
 412                 regmap_write(lt9611->regmap, 0x8207, 0x3f);
 413         }
 414
 415         if (irq_flag3 & 0xc0 && lt9611->bridge.dev)
 416                 drm_kms_helper_hotplug_event(lt9611->bridge.dev);
 417
 418         /* video input changed */
 419         if (irq_flag0 & 0x01) {
 420                 dev_info(lt9611->dev, "video input changed\n");
 421                 regmap_write(lt9611->regmap, 0x829e, 0xff);
 422                 regmap_write(lt9611->regmap, 0x829e, 0xf7);
 423                 regmap_write(lt9611->regmap, 0x8204, 0xff);
 424                 regmap_write(lt9611->regmap, 0x8204, 0xfe);
 425         }
 426
 427         return IRQ_HANDLED;
 428 }
 429
 430 static void lt9611_enable_hpd_interrupts(struct lt9611 *lt9611)
 431 {
 432         unsigned int val;
 433
 434         regmap_read(lt9611->regmap, 0x8203, &val);
 435
 436         val &= ~0xc0;
 437         regmap_write(lt9611->regmap, 0x8203, val);
 438         regmap_write(lt9611->regmap, 0x8207, 0xff); /* clear */
 439         regmap_write(lt9611->regmap, 0x8207, 0x3f);
 440 }
 441
 442 static void lt9611_sleep_setup(struct lt9611 *lt9611)
 443 {
 444         const struct reg_sequence sleep_setup[] = {
 445                 { 0x8024, 0x76 },
 446                 { 0x8023, 0x01 },
 447                 { 0x8157, 0x03 }, /* set addr pin as output */
 448                 { 0x8149, 0x0b },
 449                 { 0x8151, 0x30 }, /* disable IRQ */
 450                 { 0x8102, 0x48 }, /* MIPI Rx power down */
 451                 { 0x8123, 0x80 },
 452                 { 0x8130, 0x00 },
 453                 { 0x8100, 0x01 }, /* bandgap power down */
 454                 { 0x8101, 0x00 }, /* system clk power down */
 455         };
 456
 457         regmap_multi_reg_write(lt9611->regmap,
 458                                sleep_setup, ARRAY_SIZE(sleep_setup));
 459         lt9611->sleep = true;
 460 }
 461
 462 static int lt9611_power_on(struct lt9611 *lt9611)
 463 {
 464         int ret;
 465         const struct reg_sequence seq[] = {
 466                 /* LT9611_System_Init */
 467                 { 0x8101, 0x18 }, /* sel xtal clock */
 468
 469                 /* timer for frequency meter */
 470                 { 0x821b, 0x69 }, /* timer 2 */
 471                 { 0x821c, 0x78 },
 472                 { 0x82cb, 0x69 }, /* timer 1 */
 473                 { 0x82cc, 0x78 },
 474
 475                 /* irq init */
 476                 { 0x8251, 0x01 },
 477                 { 0x8258, 0x0a }, /* hpd irq */
 478                 { 0x8259, 0x80 }, /* hpd debounce width */
 479                 { 0x829e, 0xf7 }, /* video check irq */
 480
 481                 /* power consumption for work */
 482                 { 0x8004, 0xf0 },
 483                 { 0x8006, 0xf0 },
 484                 { 0x800a, 0x80 },
 485                 { 0x800b, 0x40 },
 486                 { 0x800d, 0xef },
 487                 { 0x8011, 0xfa },
 488         };
 489
 490         if (lt9611->power_on)
 491                 return 0;
 492
 493         ret = regmap_multi_reg_write(lt9611->regmap, seq, ARRAY_SIZE(seq));
 494         if (!ret)
 495                 lt9611->power_on = true;
 496
 497         return ret;
 498 }
 499
 500 static int lt9611_power_off(struct lt9611 *lt9611)
 501 {
 502         int ret;
 503
 504         ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
 505         if (!ret)
 506                 lt9611->power_on = false;
 507
 508         return ret;
 509 }
 510
 511 static void lt9611_reset(struct lt9611 *lt9611)
 512 {
 513         gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
 514         msleep(20);
 515
 516         gpiod_set_value_cansleep(lt9611->reset_gpio, 0);
 517         msleep(20);
 518
 519         gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
 520         msleep(100);
 521 }
 522
 523 static void lt9611_assert_5v(struct lt9611 *lt9611)
 524 {
 525         if (!lt9611->enable_gpio)
 526                 return;
 527
 528         gpiod_set_value_cansleep(lt9611->enable_gpio, 1);
 529         msleep(20);
 530 }
 531
 532 static int lt9611_regulator_init(struct lt9611 *lt9611)
 533 {
 534         int ret;
 535
 536         lt9611->supplies[0].supply = "vdd";
 537         lt9611->supplies[1].supply = "vcc";
 538
 539         ret = devm_regulator_bulk_get(lt9611->dev, 2, lt9611->supplies);
 540         if (ret < 0)
 541                 return ret;
 542
 543         return regulator_set_load(lt9611->supplies[0].consumer, 300000);
 544 }
 545
 546 static int lt9611_regulator_enable(struct lt9611 *lt9611)
 547 {
 548         int ret;
 549
 550         ret = regulator_enable(lt9611->supplies[0].consumer);
 551         if (ret < 0)
 552                 return ret;
 553
 554         usleep_range(1000, 10000);
 555
 556         ret = regulator_enable(lt9611->supplies[1].consumer);
 557         if (ret < 0) {
 558                 regulator_disable(lt9611->supplies[0].consumer);
 559                 return ret;
 560         }
 561
 562         return 0;
 563 }
 564
 565 static struct lt9611_mode *lt9611_find_mode(const struct drm_display_mode *mode)
 566 {
 567         int i;
 568
 569         for (i = 0; i < ARRAY_SIZE(lt9611_modes); i++) {
 570                 if (lt9611_modes[i].hdisplay == mode->hdisplay &&
 571                     lt9611_modes[i].vdisplay == mode->vdisplay &&
 572                     lt9611_modes[i].vrefresh == drm_mode_vrefresh(mode)) {
 573                         return &lt9611_modes[i];
 574                 }
 575         }
 576
 577         return NULL;
 578 }
 579
 580 /* connector funcs */
 581 static enum drm_connector_status
 582 lt9611_connector_detect(struct drm_connector *connector, bool force)
 583 {
 584         struct lt9611 *lt9611 = connector_to_lt9611(connector);
 585         unsigned int reg_val = 0;
 586         int connected = 0;
 587
 588         regmap_read(lt9611->regmap, 0x825e, &reg_val);
 589         connected  = (reg_val & BIT(0));
 590
 591         lt9611->status = connected ?  connector_status_connected :
 592                                 connector_status_disconnected;
 593
 594         return lt9611->status;
 595 }
 596
 597 static int lt9611_read_edid(struct lt9611 *lt9611)
 598 {
 599         unsigned int temp;
 600         int ret = 0;
 601         int i, j;
 602
 603         /* memset to clear old buffer, if any */
 604         memset(lt9611->edid_buf, 0, sizeof(lt9611->edid_buf));
 605
 606         regmap_write(lt9611->regmap, 0x8503, 0xc9);
 607
 608         /* 0xA0 is EDID device address */
 609         regmap_write(lt9611->regmap, 0x8504, 0xa0);
 610         /* 0x00 is EDID offset address */
 611         regmap_write(lt9611->regmap, 0x8505, 0x00);
 612
 613         /* length for read */
 614         regmap_write(lt9611->regmap, 0x8506, EDID_LEN);
 615         regmap_write(lt9611->regmap, 0x8514, 0x7f);
 616
 617         for (i = 0; i < EDID_LOOP; i++) {
 618                 /* offset address */
 619                 regmap_write(lt9611->regmap, 0x8505, i * EDID_LEN);
 620                 regmap_write(lt9611->regmap, 0x8507, 0x36);
 621                 regmap_write(lt9611->regmap, 0x8507, 0x31);
 622                 regmap_write(lt9611->regmap, 0x8507, 0x37);
 623                 usleep_range(5000, 10000);
 624
 625                 regmap_read(lt9611->regmap, 0x8540, &temp);
 626
 627                 if (temp & KEY_DDC_ACCS_DONE) {
 628                         for (j = 0; j < EDID_LEN; j++) {
 629                                 regmap_read(lt9611->regmap, 0x8583, &temp);
 630                                 lt9611->edid_buf[i * EDID_LEN + j] = temp;
 631                         }
 632
 633                 } else if (temp & DDC_NO_ACK) { /* DDC No Ack or Abitration lost */
 634                         dev_err(lt9611->dev, "read edid failed: no ack\n");
 635                         ret = -EIO;
 636                         goto end;
 637
 638                 } else {
 639                         dev_err(lt9611->dev, "read edid failed: access not done\n");
 640                         ret = -EIO;
 641                         goto end;
 642                 }
 643         }
 644
 645 end:
 646         regmap_write(lt9611->regmap, 0x8507, 0x1f);
 647         return ret;
 648 }
 649
 650 static int
 651 lt9611_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
 652 {
 653         struct lt9611 *lt9611 = data;
 654         int ret;
 655
 656         if (len > 128)
 657                 return -EINVAL;
 658
 659         /* supports up to 1 extension block */
 660         /* TODO: add support for more extension blocks */
 661         if (block > 1)
 662                 return -EINVAL;
 663
 664         if (block == 0) {
 665                 ret = lt9611_read_edid(lt9611);
 666                 if (ret) {
 667                         dev_err(lt9611->dev, "edid read failed\n");
 668                         return ret;
 669                 }
 670         }
 671
 672         block %= 2;
 673         memcpy(buf, lt9611->edid_buf + (block * 128), len);
 674
 675         return 0;
 676 }
 677
 678 static int lt9611_connector_get_modes(struct drm_connector *connector)
 679 {
 680         struct lt9611 *lt9611 = connector_to_lt9611(connector);
 681         unsigned int count;
 682         struct edid *edid;
 683
 684         lt9611_power_on(lt9611);
 685         edid = drm_do_get_edid(connector, lt9611_get_edid_block, lt9611);
 686         drm_connector_update_edid_property(connector, edid);
 687         count = drm_add_edid_modes(connector, edid);
 688         kfree(edid);
 689
 690         return count;
 691 }
 692
 693 static enum drm_mode_status
 694 lt9611_connector_mode_valid(struct drm_connector *connector,
 695                             struct drm_display_mode *mode)
 696 {
 697         struct lt9611_mode *lt9611_mode = lt9611_find_mode(mode);
 698
 699         return lt9611_mode ? MODE_OK : MODE_BAD;
 700 }
 701
 702 /* bridge funcs */
 703 static void
 704 lt9611_bridge_atomic_enable(struct drm_bridge *bridge,
 705                             struct drm_bridge_state *old_bridge_state)
 706 {
 707         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 708
 709         if (lt9611_power_on(lt9611)) {
 710                 dev_err(lt9611->dev, "power on failed\n");
 711                 return;
 712         }
 713
 714         lt9611_mipi_input_analog(lt9611);
 715         lt9611_hdmi_tx_digital(lt9611);
 716         lt9611_hdmi_tx_phy(lt9611);
 717
 718         msleep(500);
 719
 720         lt9611_video_check(lt9611);
 721
 722         /* Enable HDMI output */
 723         regmap_write(lt9611->regmap, 0x8130, 0xea);
 724 }
 725
 726 static void
 727 lt9611_bridge_atomic_disable(struct drm_bridge *bridge,
 728                              struct drm_bridge_state *old_bridge_state)
 729 {
 730         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 731         int ret;
 732
 733         /* Disable HDMI output */
 734         ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
 735         if (ret) {
 736                 dev_err(lt9611->dev, "video on failed\n");
 737                 return;
 738         }
 739
 740         if (lt9611_power_off(lt9611)) {
 741                 dev_err(lt9611->dev, "power on failed\n");
 742                 return;
 743         }
 744 }
 745
 746 static struct
 747 drm_connector_helper_funcs lt9611_bridge_connector_helper_funcs = {
 748         .get_modes = lt9611_connector_get_modes,
 749         .mode_valid = lt9611_connector_mode_valid,
 750 };
 751
 752 static const struct drm_connector_funcs lt9611_bridge_connector_funcs = {
 753         .fill_modes = drm_helper_probe_single_connector_modes,
 754         .detect = lt9611_connector_detect,
 755         .destroy = drm_connector_cleanup,
 756         .reset = drm_atomic_helper_connector_reset,
 757         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 758         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 759 };
 760
 761 static struct mipi_dsi_device *lt9611_attach_dsi(struct lt9611 *lt9611,
 762                                                  struct device_node *dsi_node)
 763 {
 764         const struct mipi_dsi_device_info info = { "lt9611", 0, NULL };
 765         struct mipi_dsi_device *dsi;
 766         struct mipi_dsi_host *host;
 767         struct device *dev = lt9611->dev;
 768         int ret;
 769
 770         host = of_find_mipi_dsi_host_by_node(dsi_node);
 771         if (!host) {
 772                 dev_err(lt9611->dev, "failed to find dsi host\n");
 773                 return ERR_PTR(-EPROBE_DEFER);
 774         }
 775
 776         dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
 777         if (IS_ERR(dsi)) {
 778                 dev_err(lt9611->dev, "failed to create dsi device\n");
 779                 return dsi;
 780         }
 781
 782         dsi->lanes = 4;
 783         dsi->format = MIPI_DSI_FMT_RGB888;
 784         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
 785                           MIPI_DSI_MODE_VIDEO_HSE;
 786
 787         ret = devm_mipi_dsi_attach(dev, dsi);
 788         if (ret < 0) {
 789                 dev_err(dev, "failed to attach dsi to host\n");
 790                 return ERR_PTR(ret);
 791         }
 792
 793         return dsi;
 794 }
 795
 796 static int lt9611_connector_init(struct drm_bridge *bridge, struct lt9611 *lt9611)
 797 {
 798         int ret;
 799
 800         ret = drm_connector_init(bridge->dev, &lt9611->connector,
 801                                  &lt9611_bridge_connector_funcs,
 802                                  DRM_MODE_CONNECTOR_HDMIA);
 803         if (ret) {
 804                 DRM_ERROR("Failed to initialize connector with drm\n");
 805                 return ret;
 806         }
 807
 808         drm_connector_helper_add(&lt9611->connector,
 809                                  &lt9611_bridge_connector_helper_funcs);
 810         drm_connector_attach_encoder(&lt9611->connector, bridge->encoder);
 811
 812         if (!bridge->encoder) {
 813                 DRM_ERROR("Parent encoder object not found");
 814                 return -ENODEV;
 815         }
 816
 817         return 0;
 818 }
 819
 820 static int lt9611_bridge_attach(struct drm_bridge *bridge,
 821                                 enum drm_bridge_attach_flags flags)
 822 {
 823         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 824         int ret;
 825
 826         if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
 827                 ret = lt9611_connector_init(bridge, lt9611);
 828                 if (ret < 0)
 829                         return ret;
 830         }
 831
 832         return 0;
 833 }
 834
 835 static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge,
 836                                                      const struct drm_display_info *info,
 837                                                      const struct drm_display_mode *mode)
 838 {
 839         struct lt9611_mode *lt9611_mode = lt9611_find_mode(mode);
 840         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 841
 842         if (!lt9611_mode)
 843                 return MODE_BAD;
 844         else if (lt9611_mode->intfs > 1 && !lt9611->dsi1)
 845                 return MODE_PANEL;
 846         else
 847                 return MODE_OK;
 848 }
 849
 850 static void lt9611_bridge_pre_enable(struct drm_bridge *bridge)
 851 {
 852         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 853
 854         if (!lt9611->sleep)
 855                 return;
 856
 857         lt9611_reset(lt9611);
 858         regmap_write(lt9611->regmap, 0x80ee, 0x01);
 859
 860         lt9611->sleep = false;
 861 }
 862
 863 static void
 864 lt9611_bridge_atomic_post_disable(struct drm_bridge *bridge,
 865                                   struct drm_bridge_state *old_bridge_state)
 866 {
 867         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 868
 869         lt9611_sleep_setup(lt9611);
 870 }
 871
 872 static void lt9611_bridge_mode_set(struct drm_bridge *bridge,
 873                                    const struct drm_display_mode *mode,
 874                                    const struct drm_display_mode *adj_mode)
 875 {
 876         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 877         struct hdmi_avi_infoframe avi_frame;
 878         int ret;
 879
 880         lt9611_bridge_pre_enable(bridge);
 881
 882         lt9611_mipi_input_digital(lt9611, mode);
 883         lt9611_pll_setup(lt9611, mode);
 884         lt9611_mipi_video_setup(lt9611, mode);
 885         lt9611_pcr_setup(lt9611, mode);
 886
 887         ret = drm_hdmi_avi_infoframe_from_display_mode(&avi_frame,
 888                                                        &lt9611->connector,
 889                                                        mode);
 890         if (!ret)
 891                 lt9611->vic = avi_frame.video_code;
 892 }
 893
 894 static enum drm_connector_status lt9611_bridge_detect(struct drm_bridge *bridge)
 895 {
 896         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 897         unsigned int reg_val = 0;
 898         int connected;
 899
 900         regmap_read(lt9611->regmap, 0x825e, &reg_val);
 901         connected  = reg_val & BIT(0);
 902
 903         lt9611->status = connected ?  connector_status_connected :
 904                                 connector_status_disconnected;
 905
 906         return lt9611->status;
 907 }
 908
 909 static struct edid *lt9611_bridge_get_edid(struct drm_bridge *bridge,
 910                                            struct drm_connector *connector)
 911 {
 912         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 913
 914         lt9611_power_on(lt9611);
 915         return drm_do_get_edid(connector, lt9611_get_edid_block, lt9611);
 916 }
 917
 918 static void lt9611_bridge_hpd_enable(struct drm_bridge *bridge)
 919 {
 920         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 921
 922         lt9611_enable_hpd_interrupts(lt9611);
 923 }
 924
 925 #define MAX_INPUT_SEL_FORMATS   1
 926
 927 static u32 *
 928 lt9611_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
 929                                  struct drm_bridge_state *bridge_state,
 930                                  struct drm_crtc_state *crtc_state,
 931                                  struct drm_connector_state *conn_state,
 932                                  u32 output_fmt,
 933                                  unsigned int *num_input_fmts)
 934 {
 935         u32 *input_fmts;
 936
 937         *num_input_fmts = 0;
 938
 939         input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
 940                              GFP_KERNEL);
 941         if (!input_fmts)
 942                 return NULL;
 943
 944         /* This is the DSI-end bus format */
 945         input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
 946         *num_input_fmts = 1;
 947
 948         return input_fmts;
 949 }
 950
 951 static const struct drm_bridge_funcs lt9611_bridge_funcs = {
 952         .attach = lt9611_bridge_attach,
 953         .mode_valid = lt9611_bridge_mode_valid,
 954         .mode_set = lt9611_bridge_mode_set,
 955         .detect = lt9611_bridge_detect,
 956         .get_edid = lt9611_bridge_get_edid,
 957         .hpd_enable = lt9611_bridge_hpd_enable,
 958
 959         .atomic_enable = lt9611_bridge_atomic_enable,
 960         .atomic_disable = lt9611_bridge_atomic_disable,
 961         .atomic_post_disable = lt9611_bridge_atomic_post_disable,
 962         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 963         .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 964         .atomic_reset = drm_atomic_helper_bridge_reset,
 965         .atomic_get_input_bus_fmts = lt9611_atomic_get_input_bus_fmts,
 966 };
 967
 968 static int lt9611_parse_dt(struct device *dev,
 969                            struct lt9611 *lt9611)
 970 {
 971         lt9611->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
 972         if (!lt9611->dsi0_node) {
 973                 dev_err(lt9611->dev, "failed to get remote node for primary dsi\n");
 974                 return -ENODEV;
 975         }
 976
 977         lt9611->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
 978
 979         lt9611->ac_mode = of_property_read_bool(dev->of_node, "lt,ac-mode");
 980
 981         return 0;
 982 }
 983
 984 static int lt9611_gpio_init(struct lt9611 *lt9611)
 985 {
 986         struct device *dev = lt9611->dev;
 987
 988         lt9611->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 989         if (IS_ERR(lt9611->reset_gpio)) {
 990                 dev_err(dev, "failed to acquire reset gpio\n");
 991                 return PTR_ERR(lt9611->reset_gpio);
 992         }
 993
 994         lt9611->enable_gpio = devm_gpiod_get_optional(dev, "enable",
 995                                                       GPIOD_OUT_LOW);
 996         if (IS_ERR(lt9611->enable_gpio)) {
 997                 dev_err(dev, "failed to acquire enable gpio\n");
 998                 return PTR_ERR(lt9611->enable_gpio);
 999         }
1000
1001         return 0;
1002 }
1003
1004 static int lt9611_read_device_rev(struct lt9611 *lt9611)
1005 {
1006         unsigned int rev;
1007         int ret;
1008
1009         regmap_write(lt9611->regmap, 0x80ee, 0x01);
1010         ret = regmap_read(lt9611->regmap, 0x8002, &rev);
1011         if (ret)
1012                 dev_err(lt9611->dev, "failed to read revision: %d\n", ret);
1013         else
1014                 dev_info(lt9611->dev, "LT9611 revision: 0x%x\n", rev);
1015
1016         return ret;
1017 }
1018
1019 static int lt9611_hdmi_hw_params(struct device *dev, void *data,
1020                                  struct hdmi_codec_daifmt *fmt,
1021                                  struct hdmi_codec_params *hparms)
1022 {
1023         struct lt9611 *lt9611 = data;
1024
1025         if (hparms->sample_rate == 48000)
1026                 regmap_write(lt9611->regmap, 0x840f, 0x2b);
1027         else if (hparms->sample_rate == 96000)
1028                 regmap_write(lt9611->regmap, 0x840f, 0xab);
1029         else
1030                 return -EINVAL;
1031
1032         regmap_write(lt9611->regmap, 0x8435, 0x00);
1033         regmap_write(lt9611->regmap, 0x8436, 0x18);
1034         regmap_write(lt9611->regmap, 0x8437, 0x00);
1035
1036         return 0;
1037 }
1038
1039 static int lt9611_audio_startup(struct device *dev, void *data)
1040 {
1041         struct lt9611 *lt9611 = data;
1042
1043         regmap_write(lt9611->regmap, 0x82d6, 0x8c);
1044         regmap_write(lt9611->regmap, 0x82d7, 0x04);
1045
1046         regmap_write(lt9611->regmap, 0x8406, 0x08);
1047         regmap_write(lt9611->regmap, 0x8407, 0x10);
1048
1049         regmap_write(lt9611->regmap, 0x8434, 0xd5);
1050
1051         return 0;
1052 }
1053
1054 static void lt9611_audio_shutdown(struct device *dev, void *data)
1055 {
1056         struct lt9611 *lt9611 = data;
1057
1058         regmap_write(lt9611->regmap, 0x8406, 0x00);
1059         regmap_write(lt9611->regmap, 0x8407, 0x00);
1060 }
1061
1062 static int lt9611_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
1063                                       struct device_node *endpoint)
1064 {
1065         struct of_endpoint of_ep;
1066         int ret;
1067
1068         ret = of_graph_parse_endpoint(endpoint, &of_ep);
1069         if (ret < 0)
1070                 return ret;
1071
1072         /*
1073          * HDMI sound should be located as reg = <2>
1074          * Then, it is sound port 0
1075          */
1076         if (of_ep.port == 2)
1077                 return 0;
1078
1079         return -EINVAL;
1080 }
1081
1082 static const struct hdmi_codec_ops lt9611_codec_ops = {
1083         .hw_params      = lt9611_hdmi_hw_params,
1084         .audio_shutdown = lt9611_audio_shutdown,
1085         .audio_startup  = lt9611_audio_startup,
1086         .get_dai_id     = lt9611_hdmi_i2s_get_dai_id,
1087 };
1088
1089 static struct hdmi_codec_pdata codec_data = {
1090         .ops = &lt9611_codec_ops,
1091         .max_i2s_channels = 8,
1092         .i2s = 1,
1093 };
1094
1095 static int lt9611_audio_init(struct device *dev, struct lt9611 *lt9611)
1096 {
1097         codec_data.data = lt9611;
1098         lt9611->audio_pdev =
1099                 platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
1100                                               PLATFORM_DEVID_AUTO,
1101                                               &codec_data, sizeof(codec_data));
1102
1103         return PTR_ERR_OR_ZERO(lt9611->audio_pdev);
1104 }
1105
1106 static void lt9611_audio_exit(struct lt9611 *lt9611)
1107 {
1108         if (lt9611->audio_pdev) {
1109                 platform_device_unregister(lt9611->audio_pdev);
1110                 lt9611->audio_pdev = NULL;
1111         }
1112 }
1113
1114 static int lt9611_probe(struct i2c_client *client,
1115                         const struct i2c_device_id *id)
1116 {
1117         struct lt9611 *lt9611;
1118         struct device *dev = &client->dev;
1119         int ret;
1120
1121         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1122                 dev_err(dev, "device doesn't support I2C\n");
1123                 return -ENODEV;
1124         }
1125
1126         lt9611 = devm_kzalloc(dev, sizeof(*lt9611), GFP_KERNEL);
1127         if (!lt9611)
1128                 return -ENOMEM;
1129
1130         lt9611->dev = dev;
1131         lt9611->client = client;
1132         lt9611->sleep = false;
1133
1134         lt9611->regmap = devm_regmap_init_i2c(client, &lt9611_regmap_config);
1135         if (IS_ERR(lt9611->regmap)) {
1136                 dev_err(lt9611->dev, "regmap i2c init failed\n");
1137                 return PTR_ERR(lt9611->regmap);
1138         }
1139
1140         ret = lt9611_parse_dt(dev, lt9611);
1141         if (ret) {
1142                 dev_err(dev, "failed to parse device tree\n");
1143                 return ret;
1144         }
1145
1146         ret = lt9611_gpio_init(lt9611);
1147         if (ret < 0)
1148                 goto err_of_put;
1149
1150         ret = lt9611_regulator_init(lt9611);
1151         if (ret < 0)
1152                 goto err_of_put;
1153
1154         lt9611_assert_5v(lt9611);
1155
1156         ret = lt9611_regulator_enable(lt9611);
1157         if (ret)
1158                 goto err_of_put;
1159
1160         lt9611_reset(lt9611);
1161
1162         ret = lt9611_read_device_rev(lt9611);
1163         if (ret) {
1164                 dev_err(dev, "failed to read chip rev\n");
1165                 goto err_disable_regulators;
1166         }
1167
1168         ret = devm_request_threaded_irq(dev, client->irq, NULL,
1169                                         lt9611_irq_thread_handler,
1170                                         IRQF_ONESHOT, "lt9611", lt9611);
1171         if (ret) {
1172                 dev_err(dev, "failed to request irq\n");
1173                 goto err_disable_regulators;
1174         }
1175
1176         i2c_set_clientdata(client, lt9611);
1177
1178         lt9611->bridge.funcs = &lt9611_bridge_funcs;
1179         lt9611->bridge.of_node = client->dev.of_node;
1180         lt9611->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
1181                              DRM_BRIDGE_OP_HPD | DRM_BRIDGE_OP_MODES;
1182         lt9611->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
1183
1184         drm_bridge_add(&lt9611->bridge);
1185
1186         /* Attach primary DSI */
1187         lt9611->dsi0 = lt9611_attach_dsi(lt9611, lt9611->dsi0_node);
1188         if (IS_ERR(lt9611->dsi0)) {
1189                 ret = PTR_ERR(lt9611->dsi0);
1190                 goto err_remove_bridge;
1191         }
1192
1193         /* Attach secondary DSI, if specified */
1194         if (lt9611->dsi1_node) {
1195                 lt9611->dsi1 = lt9611_attach_dsi(lt9611, lt9611->dsi1_node);
1196                 if (IS_ERR(lt9611->dsi1)) {
1197                         ret = PTR_ERR(lt9611->dsi1);
1198                         goto err_remove_bridge;
1199                 }
1200         }
1201
1202         lt9611_enable_hpd_interrupts(lt9611);
1203
1204         ret = lt9611_audio_init(dev, lt9611);
1205         if (ret)
1206                 goto err_remove_bridge;
1207
1208         return 0;
1209
1210 err_remove_bridge:
1211         drm_bridge_remove(&lt9611->bridge);
1212
1213 err_disable_regulators:
1214         regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
1215
1216 err_of_put:
1217         of_node_put(lt9611->dsi1_node);
1218         of_node_put(lt9611->dsi0_node);
1219
1220         return ret;
1221 }
1222
1223 static int lt9611_remove(struct i2c_client *client)
1224 {
1225         struct lt9611 *lt9611 = i2c_get_clientdata(client);
1226
1227         disable_irq(client->irq);
1228         lt9611_audio_exit(lt9611);
1229         drm_bridge_remove(&lt9611->bridge);
1230
1231         regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
1232
1233         of_node_put(lt9611->dsi1_node);
1234         of_node_put(lt9611->dsi0_node);
1235
1236         return 0;
1237 }
1238
1239 static struct i2c_device_id lt9611_id[] = {
1240         { "lontium,lt9611", 0 },
1241         {}
1242 };
1243 MODULE_DEVICE_TABLE(i2c, lt9611_id);
1244
1245 static const struct of_device_id lt9611_match_table[] = {
1246         { .compatible = "lontium,lt9611" },
1247         { }
1248 };
1249 MODULE_DEVICE_TABLE(of, lt9611_match_table);
1250
1251 static struct i2c_driver lt9611_driver = {
1252         .driver = {
1253                 .name = "lt9611",
1254                 .of_match_table = lt9611_match_table,
1255         },
1256         .probe = lt9611_probe,
1257         .remove = lt9611_remove,
1258         .id_table = lt9611_id,
1259 };
1260 module_i2c_driver(lt9611_driver);
1261
1262 MODULE_LICENSE("GPL v2");