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/i2c.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/media-bus-format.h>
  11 #include <linux/module.h>
  12 #include <linux/of_graph.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/regmap.h>
  15 #include <linux/regulator/consumer.h>
  16
  17 #include <sound/hdmi-codec.h>
  18
  19 #include <drm/drm_atomic_helper.h>
  20 #include <drm/drm_bridge.h>
  21 #include <drm/drm_mipi_dsi.h>
  22 #include <drm/drm_of.h>
  23 #include <drm/drm_print.h>
  24 #include <drm/drm_probe_helper.h>
  25
  26 #define EDID_SEG_SIZE   256
  27 #define EDID_LEN        32
  28 #define EDID_LOOP       8
  29 #define KEY_DDC_ACCS_DONE 0x02
  30 #define DDC_NO_ACK      0x50
  31
  32 #define LT9611_4LANES   0
  33
  34 struct lt9611 {
  35         struct device *dev;
  36         struct drm_bridge bridge;
  37         struct drm_bridge *next_bridge;
  38
  39         struct regmap *regmap;
  40
  41         struct device_node *dsi0_node;
  42         struct device_node *dsi1_node;
  43         struct mipi_dsi_device *dsi0;
  44         struct mipi_dsi_device *dsi1;
  45         struct platform_device *audio_pdev;
  46
  47         bool ac_mode;
  48
  49         struct gpio_desc *reset_gpio;
  50         struct gpio_desc *enable_gpio;
  51
  52         bool power_on;
  53         bool sleep;
  54
  55         struct regulator_bulk_data supplies[2];
  56
  57         struct i2c_client *client;
  58
  59         enum drm_connector_status status;
  60
  61         u8 edid_buf[EDID_SEG_SIZE];
  62 };
  63
  64 #define LT9611_PAGE_CONTROL     0xff
  65
  66 static const struct regmap_range_cfg lt9611_ranges[] = {
  67         {
  68                 .name = "register_range",
  69                 .range_min =  0,
  70                 .range_max = 0x85ff,
  71                 .selector_reg = LT9611_PAGE_CONTROL,
  72                 .selector_mask = 0xff,
  73                 .selector_shift = 0,
  74                 .window_start = 0,
  75                 .window_len = 0x100,
  76         },
  77 };
  78
  79 static const struct regmap_config lt9611_regmap_config = {
  80         .reg_bits = 8,
  81         .val_bits = 8,
  82         .max_register = 0xffff,
  83         .ranges = lt9611_ranges,
  84         .num_ranges = ARRAY_SIZE(lt9611_ranges),
  85 };
  86
  87 static struct lt9611 *bridge_to_lt9611(struct drm_bridge *bridge)
  88 {
  89         return container_of(bridge, struct lt9611, bridge);
  90 }
  91
  92 static int lt9611_mipi_input_analog(struct lt9611 *lt9611)
  93 {
  94         const struct reg_sequence reg_cfg[] = {
  95                 { 0x8106, 0x40 }, /* port A rx current */
  96                 { 0x810a, 0xfe }, /* port A ldo voltage set */
  97                 { 0x810b, 0xbf }, /* enable port A lprx */
  98                 { 0x8111, 0x40 }, /* port B rx current */
  99                 { 0x8115, 0xfe }, /* port B ldo voltage set */
 100                 { 0x8116, 0xbf }, /* enable port B lprx */
 101
 102                 { 0x811c, 0x03 }, /* PortA clk lane no-LP mode */
 103                 { 0x8120, 0x03 }, /* PortB clk lane with-LP mode */
 104         };
 105
 106         return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 107 }
 108
 109 static int lt9611_mipi_input_digital(struct lt9611 *lt9611,
 110                                      const struct drm_display_mode *mode)
 111 {
 112         struct reg_sequence reg_cfg[] = {
 113                 { 0x8300, LT9611_4LANES },
 114                 { 0x830a, 0x00 },
 115                 { 0x824f, 0x80 },
 116                 { 0x8250, 0x10 },
 117                 { 0x8302, 0x0a },
 118                 { 0x8306, 0x0a },
 119         };
 120
 121         if (lt9611->dsi1_node)
 122                 reg_cfg[1].def = 0x03;
 123
 124         return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 125 }
 126
 127 static void lt9611_mipi_video_setup(struct lt9611 *lt9611,
 128                                     const struct drm_display_mode *mode)
 129 {
 130         u32 h_total, hactive, hsync_len, hfront_porch, hsync_porch;
 131         u32 v_total, vactive, vsync_len, vfront_porch, vsync_porch;
 132
 133         h_total = mode->htotal;
 134         v_total = mode->vtotal;
 135
 136         hactive = mode->hdisplay;
 137         hsync_len = mode->hsync_end - mode->hsync_start;
 138         hfront_porch = mode->hsync_start - mode->hdisplay;
 139         hsync_porch = mode->htotal - mode->hsync_start;
 140
 141         vactive = mode->vdisplay;
 142         vsync_len = mode->vsync_end - mode->vsync_start;
 143         vfront_porch = mode->vsync_start - mode->vdisplay;
 144         vsync_porch = mode->vtotal - mode->vsync_start;
 145
 146         regmap_write(lt9611->regmap, 0x830d, (u8)(v_total / 256));
 147         regmap_write(lt9611->regmap, 0x830e, (u8)(v_total % 256));
 148
 149         regmap_write(lt9611->regmap, 0x830f, (u8)(vactive / 256));
 150         regmap_write(lt9611->regmap, 0x8310, (u8)(vactive % 256));
 151
 152         regmap_write(lt9611->regmap, 0x8311, (u8)(h_total / 256));
 153         regmap_write(lt9611->regmap, 0x8312, (u8)(h_total % 256));
 154
 155         regmap_write(lt9611->regmap, 0x8313, (u8)(hactive / 256));
 156         regmap_write(lt9611->regmap, 0x8314, (u8)(hactive % 256));
 157
 158         regmap_write(lt9611->regmap, 0x8315, (u8)(vsync_len % 256));
 159         regmap_write(lt9611->regmap, 0x8316, (u8)(hsync_len % 256));
 160
 161         regmap_write(lt9611->regmap, 0x8317, (u8)(vfront_porch % 256));
 162
 163         regmap_write(lt9611->regmap, 0x8318, (u8)(vsync_porch % 256));
 164
 165         regmap_write(lt9611->regmap, 0x8319, (u8)(hfront_porch % 256));
 166
 167         regmap_write(lt9611->regmap, 0x831a, (u8)(hsync_porch / 256) |
 168                                                 ((hfront_porch / 256) << 4));
 169         regmap_write(lt9611->regmap, 0x831b, (u8)(hsync_porch % 256));
 170 }
 171
 172 static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode, unsigned int postdiv)
 173 {
 174         unsigned int pcr_m = mode->clock * 5 * postdiv / 27000;
 175         const struct reg_sequence reg_cfg[] = {
 176                 { 0x830b, 0x01 },
 177                 { 0x830c, 0x10 },
 178                 { 0x8348, 0x00 },
 179                 { 0x8349, 0x81 },
 180
 181                 /* stage 1 */
 182                 { 0x8321, 0x4a },
 183                 { 0x8324, 0x71 },
 184                 { 0x8325, 0x30 },
 185                 { 0x832a, 0x01 },
 186
 187                 /* stage 2 */
 188                 { 0x834a, 0x40 },
 189
 190                 /* MK limit */
 191                 { 0x832d, 0x38 },
 192                 { 0x8331, 0x08 },
 193         };
 194         u8 pol = 0x10;
 195
 196         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
 197                 pol |= 0x2;
 198         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 199                 pol |= 0x1;
 200         regmap_write(lt9611->regmap, 0x831d, pol);
 201
 202         regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 203         if (lt9611->dsi1_node) {
 204                 unsigned int hact = mode->hdisplay;
 205
 206                 hact >>= 2;
 207                 hact += 0x50;
 208                 hact = min(hact, 0x3e0U);
 209                 regmap_write(lt9611->regmap, 0x830b, hact / 256);
 210                 regmap_write(lt9611->regmap, 0x830c, hact % 256);
 211                 regmap_write(lt9611->regmap, 0x8348, hact / 256);
 212                 regmap_write(lt9611->regmap, 0x8349, hact % 256);
 213         }
 214
 215         regmap_write(lt9611->regmap, 0x8326, pcr_m);
 216
 217         /* pcr rst */
 218         regmap_write(lt9611->regmap, 0x8011, 0x5a);
 219         regmap_write(lt9611->regmap, 0x8011, 0xfa);
 220 }
 221
 222 static int lt9611_pll_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode, unsigned int *postdiv)
 223 {
 224         unsigned int pclk = mode->clock;
 225         const struct reg_sequence reg_cfg[] = {
 226                 /* txpll init */
 227                 { 0x8123, 0x40 },
 228                 { 0x8124, 0x64 },
 229                 { 0x8125, 0x80 },
 230                 { 0x8126, 0x55 },
 231                 { 0x812c, 0x37 },
 232                 { 0x812f, 0x01 },
 233                 { 0x8126, 0x55 },
 234                 { 0x8127, 0x66 },
 235                 { 0x8128, 0x88 },
 236                 { 0x812a, 0x20 },
 237         };
 238
 239         regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 240
 241         if (pclk > 150000) {
 242                 regmap_write(lt9611->regmap, 0x812d, 0x88);
 243                 *postdiv = 1;
 244         } else if (pclk > 70000) {
 245                 regmap_write(lt9611->regmap, 0x812d, 0x99);
 246                 *postdiv = 2;
 247         } else {
 248                 regmap_write(lt9611->regmap, 0x812d, 0xaa);
 249                 *postdiv = 4;
 250         }
 251
 252         /*
 253          * first divide pclk by 2 first
 254          *  - write divide by 64k to 19:16 bits which means shift by 17
 255          *  - write divide by 256 to 15:8 bits which means shift by 9
 256          *  - write remainder to 7:0 bits, which means shift by 1
 257          */
 258         regmap_write(lt9611->regmap, 0x82e3, pclk >> 17); /* pclk[19:16] */
 259         regmap_write(lt9611->regmap, 0x82e4, pclk >> 9);  /* pclk[15:8]  */
 260         regmap_write(lt9611->regmap, 0x82e5, pclk >> 1);  /* pclk[7:0]   */
 261
 262         regmap_write(lt9611->regmap, 0x82de, 0x20);
 263         regmap_write(lt9611->regmap, 0x82de, 0xe0);
 264
 265         regmap_write(lt9611->regmap, 0x8016, 0xf1);
 266         regmap_write(lt9611->regmap, 0x8016, 0xf3);
 267
 268         return 0;
 269 }
 270
 271 static int lt9611_read_video_check(struct lt9611 *lt9611, unsigned int reg)
 272 {
 273         unsigned int temp, temp2;
 274         int ret;
 275
 276         ret = regmap_read(lt9611->regmap, reg, &temp);
 277         if (ret)
 278                 return ret;
 279         temp <<= 8;
 280         ret = regmap_read(lt9611->regmap, reg + 1, &temp2);
 281         if (ret)
 282                 return ret;
 283
 284         return (temp + temp2);
 285 }
 286
 287 static int lt9611_video_check(struct lt9611 *lt9611)
 288 {
 289         u32 v_total, vactive, hactive_a, hactive_b, h_total_sysclk;
 290         int temp;
 291
 292         /* top module video check */
 293
 294         /* vactive */
 295         temp = lt9611_read_video_check(lt9611, 0x8282);
 296         if (temp < 0)
 297                 goto end;
 298         vactive = temp;
 299
 300         /* v_total */
 301         temp = lt9611_read_video_check(lt9611, 0x826c);
 302         if (temp < 0)
 303                 goto end;
 304         v_total = temp;
 305
 306         /* h_total_sysclk */
 307         temp = lt9611_read_video_check(lt9611, 0x8286);
 308         if (temp < 0)
 309                 goto end;
 310         h_total_sysclk = temp;
 311
 312         /* hactive_a */
 313         temp = lt9611_read_video_check(lt9611, 0x8382);
 314         if (temp < 0)
 315                 goto end;
 316         hactive_a = temp / 3;
 317
 318         /* hactive_b */
 319         temp = lt9611_read_video_check(lt9611, 0x8386);
 320         if (temp < 0)
 321                 goto end;
 322         hactive_b = temp / 3;
 323
 324         dev_info(lt9611->dev,
 325                  "video check: hactive_a=%d, hactive_b=%d, vactive=%d, v_total=%d, h_total_sysclk=%d\n",
 326                  hactive_a, hactive_b, vactive, v_total, h_total_sysclk);
 327
 328         return 0;
 329
 330 end:
 331         dev_err(lt9611->dev, "read video check error\n");
 332         return temp;
 333 }
 334
 335 static void lt9611_hdmi_set_infoframes(struct lt9611 *lt9611,
 336                                        struct drm_connector *connector,
 337                                        struct drm_display_mode *mode)
 338 {
 339         union hdmi_infoframe infoframe;
 340         ssize_t len;
 341         u8 iframes = 0x0a; /* UD1 infoframe */
 342         u8 buf[32];
 343         int ret;
 344         int i;
 345
 346         ret = drm_hdmi_avi_infoframe_from_display_mode(&infoframe.avi,
 347                                                        connector,
 348                                                        mode);
 349         if (ret < 0)
 350                 goto out;
 351
 352         len = hdmi_infoframe_pack(&infoframe, buf, sizeof(buf));
 353         if (len < 0)
 354                 goto out;
 355
 356         for (i = 0; i < len; i++)
 357                 regmap_write(lt9611->regmap, 0x8440 + i, buf[i]);
 358
 359         ret = drm_hdmi_vendor_infoframe_from_display_mode(&infoframe.vendor.hdmi,
 360                                                           connector,
 361                                                           mode);
 362         if (ret < 0)
 363                 goto out;
 364
 365         len = hdmi_infoframe_pack(&infoframe, buf, sizeof(buf));
 366         if (len < 0)
 367                 goto out;
 368
 369         for (i = 0; i < len; i++)
 370                 regmap_write(lt9611->regmap, 0x8474 + i, buf[i]);
 371
 372         iframes |= 0x20;
 373
 374 out:
 375         regmap_write(lt9611->regmap, 0x843d, iframes); /* UD1 infoframe */
 376 }
 377
 378 static void lt9611_hdmi_tx_digital(struct lt9611 *lt9611, bool is_hdmi)
 379 {
 380         if (is_hdmi)
 381                 regmap_write(lt9611->regmap, 0x82d6, 0x8c);
 382         else
 383                 regmap_write(lt9611->regmap, 0x82d6, 0x0c);
 384         regmap_write(lt9611->regmap, 0x82d7, 0x04);
 385 }
 386
 387 static void lt9611_hdmi_tx_phy(struct lt9611 *lt9611)
 388 {
 389         struct reg_sequence reg_cfg[] = {
 390                 { 0x8130, 0x6a },
 391                 { 0x8131, 0x44 }, /* HDMI DC mode */
 392                 { 0x8132, 0x4a },
 393                 { 0x8133, 0x0b },
 394                 { 0x8134, 0x00 },
 395                 { 0x8135, 0x00 },
 396                 { 0x8136, 0x00 },
 397                 { 0x8137, 0x44 },
 398                 { 0x813f, 0x0f },
 399                 { 0x8140, 0xa0 },
 400                 { 0x8141, 0xa0 },
 401                 { 0x8142, 0xa0 },
 402                 { 0x8143, 0xa0 },
 403                 { 0x8144, 0x0a },
 404         };
 405
 406         /* HDMI AC mode */
 407         if (lt9611->ac_mode)
 408                 reg_cfg[2].def = 0x73;
 409
 410         regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 411 }
 412
 413 static irqreturn_t lt9611_irq_thread_handler(int irq, void *dev_id)
 414 {
 415         struct lt9611 *lt9611 = dev_id;
 416         unsigned int irq_flag0 = 0;
 417         unsigned int irq_flag3 = 0;
 418
 419         regmap_read(lt9611->regmap, 0x820f, &irq_flag3);
 420         regmap_read(lt9611->regmap, 0x820c, &irq_flag0);
 421
 422         /* hpd changed low */
 423         if (irq_flag3 & 0x80) {
 424                 dev_info(lt9611->dev, "hdmi cable disconnected\n");
 425
 426                 regmap_write(lt9611->regmap, 0x8207, 0xbf);
 427                 regmap_write(lt9611->regmap, 0x8207, 0x3f);
 428         }
 429
 430         /* hpd changed high */
 431         if (irq_flag3 & 0x40) {
 432                 dev_info(lt9611->dev, "hdmi cable connected\n");
 433
 434                 regmap_write(lt9611->regmap, 0x8207, 0x7f);
 435                 regmap_write(lt9611->regmap, 0x8207, 0x3f);
 436         }
 437
 438         if (irq_flag3 & 0xc0 && lt9611->bridge.dev)
 439                 drm_kms_helper_hotplug_event(lt9611->bridge.dev);
 440
 441         /* video input changed */
 442         if (irq_flag0 & 0x01) {
 443                 dev_info(lt9611->dev, "video input changed\n");
 444                 regmap_write(lt9611->regmap, 0x829e, 0xff);
 445                 regmap_write(lt9611->regmap, 0x829e, 0xf7);
 446                 regmap_write(lt9611->regmap, 0x8204, 0xff);
 447                 regmap_write(lt9611->regmap, 0x8204, 0xfe);
 448         }
 449
 450         return IRQ_HANDLED;
 451 }
 452
 453 static void lt9611_enable_hpd_interrupts(struct lt9611 *lt9611)
 454 {
 455         unsigned int val;
 456
 457         regmap_read(lt9611->regmap, 0x8203, &val);
 458
 459         val &= ~0xc0;
 460         regmap_write(lt9611->regmap, 0x8203, val);
 461         regmap_write(lt9611->regmap, 0x8207, 0xff); /* clear */
 462         regmap_write(lt9611->regmap, 0x8207, 0x3f);
 463 }
 464
 465 static void lt9611_sleep_setup(struct lt9611 *lt9611)
 466 {
 467         const struct reg_sequence sleep_setup[] = {
 468                 { 0x8024, 0x76 },
 469                 { 0x8023, 0x01 },
 470                 { 0x8157, 0x03 }, /* set addr pin as output */
 471                 { 0x8149, 0x0b },
 472
 473                 { 0x8102, 0x48 }, /* MIPI Rx power down */
 474                 { 0x8123, 0x80 },
 475                 { 0x8130, 0x00 },
 476                 { 0x8011, 0x0a },
 477         };
 478
 479         regmap_multi_reg_write(lt9611->regmap,
 480                                sleep_setup, ARRAY_SIZE(sleep_setup));
 481         lt9611->sleep = true;
 482 }
 483
 484 static int lt9611_power_on(struct lt9611 *lt9611)
 485 {
 486         int ret;
 487         const struct reg_sequence seq[] = {
 488                 /* LT9611_System_Init */
 489                 { 0x8101, 0x18 }, /* sel xtal clock */
 490
 491                 /* timer for frequency meter */
 492                 { 0x821b, 0x69 }, /* timer 2 */
 493                 { 0x821c, 0x78 },
 494                 { 0x82cb, 0x69 }, /* timer 1 */
 495                 { 0x82cc, 0x78 },
 496
 497                 /* irq init */
 498                 { 0x8251, 0x01 },
 499                 { 0x8258, 0x0a }, /* hpd irq */
 500                 { 0x8259, 0x80 }, /* hpd debounce width */
 501                 { 0x829e, 0xf7 }, /* video check irq */
 502
 503                 /* power consumption for work */
 504                 { 0x8004, 0xf0 },
 505                 { 0x8006, 0xf0 },
 506                 { 0x800a, 0x80 },
 507                 { 0x800b, 0x40 },
 508                 { 0x800d, 0xef },
 509                 { 0x8011, 0xfa },
 510         };
 511
 512         if (lt9611->power_on)
 513                 return 0;
 514
 515         ret = regmap_multi_reg_write(lt9611->regmap, seq, ARRAY_SIZE(seq));
 516         if (!ret)
 517                 lt9611->power_on = true;
 518
 519         return ret;
 520 }
 521
 522 static int lt9611_power_off(struct lt9611 *lt9611)
 523 {
 524         int ret;
 525
 526         ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
 527         if (!ret)
 528                 lt9611->power_on = false;
 529
 530         return ret;
 531 }
 532
 533 static void lt9611_reset(struct lt9611 *lt9611)
 534 {
 535         gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
 536         msleep(20);
 537
 538         gpiod_set_value_cansleep(lt9611->reset_gpio, 0);
 539         msleep(20);
 540
 541         gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
 542         msleep(100);
 543 }
 544
 545 static void lt9611_assert_5v(struct lt9611 *lt9611)
 546 {
 547         if (!lt9611->enable_gpio)
 548                 return;
 549
 550         gpiod_set_value_cansleep(lt9611->enable_gpio, 1);
 551         msleep(20);
 552 }
 553
 554 static int lt9611_regulator_init(struct lt9611 *lt9611)
 555 {
 556         int ret;
 557
 558         lt9611->supplies[0].supply = "vdd";
 559         lt9611->supplies[1].supply = "vcc";
 560
 561         ret = devm_regulator_bulk_get(lt9611->dev, 2, lt9611->supplies);
 562         if (ret < 0)
 563                 return ret;
 564
 565         return regulator_set_load(lt9611->supplies[0].consumer, 300000);
 566 }
 567
 568 static int lt9611_regulator_enable(struct lt9611 *lt9611)
 569 {
 570         int ret;
 571
 572         ret = regulator_enable(lt9611->supplies[0].consumer);
 573         if (ret < 0)
 574                 return ret;
 575
 576         usleep_range(1000, 10000);
 577
 578         ret = regulator_enable(lt9611->supplies[1].consumer);
 579         if (ret < 0) {
 580                 regulator_disable(lt9611->supplies[0].consumer);
 581                 return ret;
 582         }
 583
 584         return 0;
 585 }
 586
 587 static enum drm_connector_status lt9611_bridge_detect(struct drm_bridge *bridge)
 588 {
 589         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 590         unsigned int reg_val = 0;
 591         int connected = 0;
 592
 593         regmap_read(lt9611->regmap, 0x825e, &reg_val);
 594         connected  = (reg_val & (BIT(2) | BIT(0)));
 595
 596         lt9611->status = connected ?  connector_status_connected :
 597                                 connector_status_disconnected;
 598
 599         return lt9611->status;
 600 }
 601
 602 static int lt9611_read_edid(struct lt9611 *lt9611)
 603 {
 604         unsigned int temp;
 605         int ret = 0;
 606         int i, j;
 607
 608         /* memset to clear old buffer, if any */
 609         memset(lt9611->edid_buf, 0, sizeof(lt9611->edid_buf));
 610
 611         regmap_write(lt9611->regmap, 0x8503, 0xc9);
 612
 613         /* 0xA0 is EDID device address */
 614         regmap_write(lt9611->regmap, 0x8504, 0xa0);
 615         /* 0x00 is EDID offset address */
 616         regmap_write(lt9611->regmap, 0x8505, 0x00);
 617
 618         /* length for read */
 619         regmap_write(lt9611->regmap, 0x8506, EDID_LEN);
 620         regmap_write(lt9611->regmap, 0x8514, 0x7f);
 621
 622         for (i = 0; i < EDID_LOOP; i++) {
 623                 /* offset address */
 624                 regmap_write(lt9611->regmap, 0x8505, i * EDID_LEN);
 625                 regmap_write(lt9611->regmap, 0x8507, 0x36);
 626                 regmap_write(lt9611->regmap, 0x8507, 0x31);
 627                 regmap_write(lt9611->regmap, 0x8507, 0x37);
 628                 usleep_range(5000, 10000);
 629
 630                 regmap_read(lt9611->regmap, 0x8540, &temp);
 631
 632                 if (temp & KEY_DDC_ACCS_DONE) {
 633                         for (j = 0; j < EDID_LEN; j++) {
 634                                 regmap_read(lt9611->regmap, 0x8583, &temp);
 635                                 lt9611->edid_buf[i * EDID_LEN + j] = temp;
 636                         }
 637
 638                 } else if (temp & DDC_NO_ACK) { /* DDC No Ack or Abitration lost */
 639                         dev_err(lt9611->dev, "read edid failed: no ack\n");
 640                         ret = -EIO;
 641                         goto end;
 642
 643                 } else {
 644                         dev_err(lt9611->dev, "read edid failed: access not done\n");
 645                         ret = -EIO;
 646                         goto end;
 647                 }
 648         }
 649
 650 end:
 651         regmap_write(lt9611->regmap, 0x8507, 0x1f);
 652         return ret;
 653 }
 654
 655 static int
 656 lt9611_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
 657 {
 658         struct lt9611 *lt9611 = data;
 659         int ret;
 660
 661         if (len > 128)
 662                 return -EINVAL;
 663
 664         /* supports up to 1 extension block */
 665         /* TODO: add support for more extension blocks */
 666         if (block > 1)
 667                 return -EINVAL;
 668
 669         if (block == 0) {
 670                 ret = lt9611_read_edid(lt9611);
 671                 if (ret) {
 672                         dev_err(lt9611->dev, "edid read failed\n");
 673                         return ret;
 674                 }
 675         }
 676
 677         block %= 2;
 678         memcpy(buf, lt9611->edid_buf + (block * 128), len);
 679
 680         return 0;
 681 }
 682
 683 /* bridge funcs */
 684 static void
 685 lt9611_bridge_atomic_enable(struct drm_bridge *bridge,
 686                             struct drm_bridge_state *old_bridge_state)
 687 {
 688         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 689         struct drm_atomic_state *state = old_bridge_state->base.state;
 690         struct drm_connector *connector;
 691         struct drm_connector_state *conn_state;
 692         struct drm_crtc_state *crtc_state;
 693         struct drm_display_mode *mode;
 694         unsigned int postdiv;
 695
 696         connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
 697         if (WARN_ON(!connector))
 698                 return;
 699
 700         conn_state = drm_atomic_get_new_connector_state(state, connector);
 701         if (WARN_ON(!conn_state))
 702                 return;
 703
 704         crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
 705         if (WARN_ON(!crtc_state))
 706                 return;
 707
 708         mode = &crtc_state->adjusted_mode;
 709
 710         lt9611_mipi_input_digital(lt9611, mode);
 711         lt9611_pll_setup(lt9611, mode, &postdiv);
 712         lt9611_mipi_video_setup(lt9611, mode);
 713         lt9611_pcr_setup(lt9611, mode, postdiv);
 714
 715         if (lt9611_power_on(lt9611)) {
 716                 dev_err(lt9611->dev, "power on failed\n");
 717                 return;
 718         }
 719
 720         lt9611_mipi_input_analog(lt9611);
 721         lt9611_hdmi_set_infoframes(lt9611, connector, mode);
 722         lt9611_hdmi_tx_digital(lt9611, connector->display_info.is_hdmi);
 723         lt9611_hdmi_tx_phy(lt9611);
 724
 725         msleep(500);
 726
 727         lt9611_video_check(lt9611);
 728
 729         /* Enable HDMI output */
 730         regmap_write(lt9611->regmap, 0x8130, 0xea);
 731 }
 732
 733 static void
 734 lt9611_bridge_atomic_disable(struct drm_bridge *bridge,
 735                              struct drm_bridge_state *old_bridge_state)
 736 {
 737         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 738         int ret;
 739
 740         /* Disable HDMI output */
 741         ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
 742         if (ret) {
 743                 dev_err(lt9611->dev, "video on failed\n");
 744                 return;
 745         }
 746
 747         if (lt9611_power_off(lt9611)) {
 748                 dev_err(lt9611->dev, "power on failed\n");
 749                 return;
 750         }
 751 }
 752
 753 static struct mipi_dsi_device *lt9611_attach_dsi(struct lt9611 *lt9611,
 754                                                  struct device_node *dsi_node)
 755 {
 756         const struct mipi_dsi_device_info info = { "lt9611", 0, lt9611->dev->of_node};
 757         struct mipi_dsi_device *dsi;
 758         struct mipi_dsi_host *host;
 759         struct device *dev = lt9611->dev;
 760         int ret;
 761
 762         host = of_find_mipi_dsi_host_by_node(dsi_node);
 763         if (!host) {
 764                 dev_err(lt9611->dev, "failed to find dsi host\n");
 765                 return ERR_PTR(-EPROBE_DEFER);
 766         }
 767
 768         dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
 769         if (IS_ERR(dsi)) {
 770                 dev_err(lt9611->dev, "failed to create dsi device\n");
 771                 return dsi;
 772         }
 773
 774         dsi->lanes = 4;
 775         dsi->format = MIPI_DSI_FMT_RGB888;
 776         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
 777                           MIPI_DSI_MODE_VIDEO_HSE;
 778
 779         ret = devm_mipi_dsi_attach(dev, dsi);
 780         if (ret < 0) {
 781                 dev_err(dev, "failed to attach dsi to host\n");
 782                 return ERR_PTR(ret);
 783         }
 784
 785         return dsi;
 786 }
 787
 788 static int lt9611_bridge_attach(struct drm_bridge *bridge,
 789                                 enum drm_bridge_attach_flags flags)
 790 {
 791         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 792
 793         return drm_bridge_attach(bridge->encoder, lt9611->next_bridge,
 794                                  bridge, flags);
 795 }
 796
 797 static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge,
 798                                                      const struct drm_display_info *info,
 799                                                      const struct drm_display_mode *mode)
 800 {
 801         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 802
 803         if (mode->hdisplay > 3840)
 804                 return MODE_BAD_HVALUE;
 805
 806         if (mode->vdisplay > 2160)
 807                 return MODE_BAD_VVALUE;
 808
 809         if (mode->hdisplay == 3840 &&
 810             mode->vdisplay == 2160 &&
 811             drm_mode_vrefresh(mode) > 30)
 812                 return MODE_CLOCK_HIGH;
 813
 814         if (mode->hdisplay > 2000 && !lt9611->dsi1_node)
 815                 return MODE_PANEL;
 816         else
 817                 return MODE_OK;
 818 }
 819
 820 static void lt9611_bridge_atomic_pre_enable(struct drm_bridge *bridge,
 821                                             struct drm_bridge_state *old_bridge_state)
 822 {
 823         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 824         static const struct reg_sequence reg_cfg[] = {
 825                 { 0x8102, 0x12 },
 826                 { 0x8123, 0x40 },
 827                 { 0x8130, 0xea },
 828                 { 0x8011, 0xfa },
 829         };
 830
 831         if (!lt9611->sleep)
 832                 return;
 833
 834         regmap_multi_reg_write(lt9611->regmap,
 835                                reg_cfg, ARRAY_SIZE(reg_cfg));
 836
 837         lt9611->sleep = false;
 838 }
 839
 840 static void
 841 lt9611_bridge_atomic_post_disable(struct drm_bridge *bridge,
 842                                   struct drm_bridge_state *old_bridge_state)
 843 {
 844         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 845
 846         lt9611_sleep_setup(lt9611);
 847 }
 848
 849 static struct edid *lt9611_bridge_get_edid(struct drm_bridge *bridge,
 850                                            struct drm_connector *connector)
 851 {
 852         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 853
 854         lt9611_power_on(lt9611);
 855         return drm_do_get_edid(connector, lt9611_get_edid_block, lt9611);
 856 }
 857
 858 static void lt9611_bridge_hpd_enable(struct drm_bridge *bridge)
 859 {
 860         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 861
 862         lt9611_enable_hpd_interrupts(lt9611);
 863 }
 864
 865 #define MAX_INPUT_SEL_FORMATS   1
 866
 867 static u32 *
 868 lt9611_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
 869                                  struct drm_bridge_state *bridge_state,
 870                                  struct drm_crtc_state *crtc_state,
 871                                  struct drm_connector_state *conn_state,
 872                                  u32 output_fmt,
 873                                  unsigned int *num_input_fmts)
 874 {
 875         u32 *input_fmts;
 876
 877         *num_input_fmts = 0;
 878
 879         input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
 880                              GFP_KERNEL);
 881         if (!input_fmts)
 882                 return NULL;
 883
 884         /* This is the DSI-end bus format */
 885         input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
 886         *num_input_fmts = 1;
 887
 888         return input_fmts;
 889 }
 890
 891 static const struct drm_bridge_funcs lt9611_bridge_funcs = {
 892         .attach = lt9611_bridge_attach,
 893         .mode_valid = lt9611_bridge_mode_valid,
 894         .detect = lt9611_bridge_detect,
 895         .get_edid = lt9611_bridge_get_edid,
 896         .hpd_enable = lt9611_bridge_hpd_enable,
 897
 898         .atomic_pre_enable = lt9611_bridge_atomic_pre_enable,
 899         .atomic_enable = lt9611_bridge_atomic_enable,
 900         .atomic_disable = lt9611_bridge_atomic_disable,
 901         .atomic_post_disable = lt9611_bridge_atomic_post_disable,
 902         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 903         .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 904         .atomic_reset = drm_atomic_helper_bridge_reset,
 905         .atomic_get_input_bus_fmts = lt9611_atomic_get_input_bus_fmts,
 906 };
 907
 908 static int lt9611_parse_dt(struct device *dev,
 909                            struct lt9611 *lt9611)
 910 {
 911         lt9611->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
 912         if (!lt9611->dsi0_node) {
 913                 dev_err(lt9611->dev, "failed to get remote node for primary dsi\n");
 914                 return -ENODEV;
 915         }
 916
 917         lt9611->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
 918
 919         lt9611->ac_mode = of_property_read_bool(dev->of_node, "lt,ac-mode");
 920
 921         return drm_of_find_panel_or_bridge(dev->of_node, 2, -1, NULL, &lt9611->next_bridge);
 922 }
 923
 924 static int lt9611_gpio_init(struct lt9611 *lt9611)
 925 {
 926         struct device *dev = lt9611->dev;
 927
 928         lt9611->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 929         if (IS_ERR(lt9611->reset_gpio)) {
 930                 dev_err(dev, "failed to acquire reset gpio\n");
 931                 return PTR_ERR(lt9611->reset_gpio);
 932         }
 933
 934         lt9611->enable_gpio = devm_gpiod_get_optional(dev, "enable",
 935                                                       GPIOD_OUT_LOW);
 936         if (IS_ERR(lt9611->enable_gpio)) {
 937                 dev_err(dev, "failed to acquire enable gpio\n");
 938                 return PTR_ERR(lt9611->enable_gpio);
 939         }
 940
 941         return 0;
 942 }
 943
 944 static int lt9611_read_device_rev(struct lt9611 *lt9611)
 945 {
 946         unsigned int rev;
 947         int ret;
 948
 949         regmap_write(lt9611->regmap, 0x80ee, 0x01);
 950         ret = regmap_read(lt9611->regmap, 0x8002, &rev);
 951         if (ret)
 952                 dev_err(lt9611->dev, "failed to read revision: %d\n", ret);
 953         else
 954                 dev_info(lt9611->dev, "LT9611 revision: 0x%x\n", rev);
 955
 956         return ret;
 957 }
 958
 959 static int lt9611_hdmi_hw_params(struct device *dev, void *data,
 960                                  struct hdmi_codec_daifmt *fmt,
 961                                  struct hdmi_codec_params *hparms)
 962 {
 963         struct lt9611 *lt9611 = data;
 964
 965         if (hparms->sample_rate == 48000)
 966                 regmap_write(lt9611->regmap, 0x840f, 0x2b);
 967         else if (hparms->sample_rate == 96000)
 968                 regmap_write(lt9611->regmap, 0x840f, 0xab);
 969         else
 970                 return -EINVAL;
 971
 972         regmap_write(lt9611->regmap, 0x8435, 0x00);
 973         regmap_write(lt9611->regmap, 0x8436, 0x18);
 974         regmap_write(lt9611->regmap, 0x8437, 0x00);
 975
 976         return 0;
 977 }
 978
 979 static int lt9611_audio_startup(struct device *dev, void *data)
 980 {
 981         struct lt9611 *lt9611 = data;
 982
 983         regmap_write(lt9611->regmap, 0x82d6, 0x8c);
 984         regmap_write(lt9611->regmap, 0x82d7, 0x04);
 985
 986         regmap_write(lt9611->regmap, 0x8406, 0x08);
 987         regmap_write(lt9611->regmap, 0x8407, 0x10);
 988
 989         regmap_write(lt9611->regmap, 0x8434, 0xd5);
 990
 991         return 0;
 992 }
 993
 994 static void lt9611_audio_shutdown(struct device *dev, void *data)
 995 {
 996         struct lt9611 *lt9611 = data;
 997
 998         regmap_write(lt9611->regmap, 0x8406, 0x00);
 999         regmap_write(lt9611->regmap, 0x8407, 0x00);
1000 }
1001
1002 static int lt9611_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
1003                                       struct device_node *endpoint)
1004 {
1005         struct of_endpoint of_ep;
1006         int ret;
1007
1008         ret = of_graph_parse_endpoint(endpoint, &of_ep);
1009         if (ret < 0)
1010                 return ret;
1011
1012         /*
1013          * HDMI sound should be located as reg = <2>
1014          * Then, it is sound port 0
1015          */
1016         if (of_ep.port == 2)
1017                 return 0;
1018
1019         return -EINVAL;
1020 }
1021
1022 static const struct hdmi_codec_ops lt9611_codec_ops = {
1023         .hw_params      = lt9611_hdmi_hw_params,
1024         .audio_shutdown = lt9611_audio_shutdown,
1025         .audio_startup  = lt9611_audio_startup,
1026         .get_dai_id     = lt9611_hdmi_i2s_get_dai_id,
1027 };
1028
1029 static struct hdmi_codec_pdata codec_data = {
1030         .ops = &lt9611_codec_ops,
1031         .max_i2s_channels = 8,
1032         .i2s = 1,
1033 };
1034
1035 static int lt9611_audio_init(struct device *dev, struct lt9611 *lt9611)
1036 {
1037         codec_data.data = lt9611;
1038         lt9611->audio_pdev =
1039                 platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
1040                                               PLATFORM_DEVID_AUTO,
1041                                               &codec_data, sizeof(codec_data));
1042
1043         return PTR_ERR_OR_ZERO(lt9611->audio_pdev);
1044 }
1045
1046 static void lt9611_audio_exit(struct lt9611 *lt9611)
1047 {
1048         if (lt9611->audio_pdev) {
1049                 platform_device_unregister(lt9611->audio_pdev);
1050                 lt9611->audio_pdev = NULL;
1051         }
1052 }
1053
1054 static int lt9611_probe(struct i2c_client *client)
1055 {
1056         struct lt9611 *lt9611;
1057         struct device *dev = &client->dev;
1058         int ret;
1059
1060         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1061                 dev_err(dev, "device doesn't support I2C\n");
1062                 return -ENODEV;
1063         }
1064
1065         lt9611 = devm_kzalloc(dev, sizeof(*lt9611), GFP_KERNEL);
1066         if (!lt9611)
1067                 return -ENOMEM;
1068
1069         lt9611->dev = dev;
1070         lt9611->client = client;
1071         lt9611->sleep = false;
1072
1073         lt9611->regmap = devm_regmap_init_i2c(client, &lt9611_regmap_config);
1074         if (IS_ERR(lt9611->regmap)) {
1075                 dev_err(lt9611->dev, "regmap i2c init failed\n");
1076                 return PTR_ERR(lt9611->regmap);
1077         }
1078
1079         ret = lt9611_parse_dt(dev, lt9611);
1080         if (ret) {
1081                 dev_err(dev, "failed to parse device tree\n");
1082                 return ret;
1083         }
1084
1085         ret = lt9611_gpio_init(lt9611);
1086         if (ret < 0)
1087                 goto err_of_put;
1088
1089         ret = lt9611_regulator_init(lt9611);
1090         if (ret < 0)
1091                 goto err_of_put;
1092
1093         lt9611_assert_5v(lt9611);
1094
1095         ret = lt9611_regulator_enable(lt9611);
1096         if (ret)
1097                 goto err_of_put;
1098
1099         lt9611_reset(lt9611);
1100
1101         ret = lt9611_read_device_rev(lt9611);
1102         if (ret) {
1103                 dev_err(dev, "failed to read chip rev\n");
1104                 goto err_disable_regulators;
1105         }
1106
1107         ret = devm_request_threaded_irq(dev, client->irq, NULL,
1108                                         lt9611_irq_thread_handler,
1109                                         IRQF_ONESHOT, "lt9611", lt9611);
1110         if (ret) {
1111                 dev_err(dev, "failed to request irq\n");
1112                 goto err_disable_regulators;
1113         }
1114
1115         i2c_set_clientdata(client, lt9611);
1116
1117         lt9611->bridge.funcs = &lt9611_bridge_funcs;
1118         lt9611->bridge.of_node = client->dev.of_node;
1119         lt9611->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
1120                              DRM_BRIDGE_OP_HPD | DRM_BRIDGE_OP_MODES;
1121         lt9611->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
1122
1123         drm_bridge_add(&lt9611->bridge);
1124
1125         /* Attach primary DSI */
1126         lt9611->dsi0 = lt9611_attach_dsi(lt9611, lt9611->dsi0_node);
1127         if (IS_ERR(lt9611->dsi0)) {
1128                 ret = PTR_ERR(lt9611->dsi0);
1129                 goto err_remove_bridge;
1130         }
1131
1132         /* Attach secondary DSI, if specified */
1133         if (lt9611->dsi1_node) {
1134                 lt9611->dsi1 = lt9611_attach_dsi(lt9611, lt9611->dsi1_node);
1135                 if (IS_ERR(lt9611->dsi1)) {
1136                         ret = PTR_ERR(lt9611->dsi1);
1137                         goto err_remove_bridge;
1138                 }
1139         }
1140
1141         lt9611_enable_hpd_interrupts(lt9611);
1142
1143         ret = lt9611_audio_init(dev, lt9611);
1144         if (ret)
1145                 goto err_remove_bridge;
1146
1147         return 0;
1148
1149 err_remove_bridge:
1150         drm_bridge_remove(&lt9611->bridge);
1151
1152 err_disable_regulators:
1153         regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
1154
1155 err_of_put:
1156         of_node_put(lt9611->dsi1_node);
1157         of_node_put(lt9611->dsi0_node);
1158
1159         return ret;
1160 }
1161
1162 static void lt9611_remove(struct i2c_client *client)
1163 {
1164         struct lt9611 *lt9611 = i2c_get_clientdata(client);
1165
1166         disable_irq(client->irq);
1167         lt9611_audio_exit(lt9611);
1168         drm_bridge_remove(&lt9611->bridge);
1169
1170         regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
1171
1172         of_node_put(lt9611->dsi1_node);
1173         of_node_put(lt9611->dsi0_node);
1174 }
1175
1176 static struct i2c_device_id lt9611_id[] = {
1177         { "lontium,lt9611", 0 },
1178         {}
1179 };
1180 MODULE_DEVICE_TABLE(i2c, lt9611_id);
1181
1182 static const struct of_device_id lt9611_match_table[] = {
1183         { .compatible = "lontium,lt9611" },
1184         { }
1185 };
1186 MODULE_DEVICE_TABLE(of, lt9611_match_table);
1187
1188 static struct i2c_driver lt9611_driver = {
1189         .driver = {
1190                 .name = "lt9611",
1191                 .of_match_table = lt9611_match_table,
1192         },
1193         .probe = lt9611_probe,
1194         .remove = lt9611_remove,
1195         .id_table = lt9611_id,
1196 };
1197 module_i2c_driver(lt9611_driver);
1198
1199 MODULE_LICENSE("GPL v2");