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_edid.h>
  22 #include <drm/drm_mipi_dsi.h>
  23 #include <drm/drm_of.h>
  24 #include <drm/drm_print.h>
  25 #include <drm/drm_probe_helper.h>
  26
  27 #define EDID_SEG_SIZE   256
  28 #define EDID_LEN        32
  29 #define EDID_LOOP       8
  30 #define KEY_DDC_ACCS_DONE 0x02
  31 #define DDC_NO_ACK      0x50
  32
  33 #define LT9611_4LANES   0
  34
  35 struct lt9611 {
  36         struct device *dev;
  37         struct drm_bridge bridge;
  38         struct drm_bridge *next_bridge;
  39
  40         struct regmap *regmap;
  41
  42         struct device_node *dsi0_node;
  43         struct device_node *dsi1_node;
  44         struct mipi_dsi_device *dsi0;
  45         struct mipi_dsi_device *dsi1;
  46         struct platform_device *audio_pdev;
  47
  48         bool ac_mode;
  49
  50         struct gpio_desc *reset_gpio;
  51         struct gpio_desc *enable_gpio;
  52
  53         bool power_on;
  54         bool sleep;
  55
  56         struct regulator_bulk_data supplies[2];
  57
  58         struct i2c_client *client;
  59
  60         enum drm_connector_status status;
  61
  62         u8 edid_buf[EDID_SEG_SIZE];
  63 };
  64
  65 #define LT9611_PAGE_CONTROL     0xff
  66
  67 static const struct regmap_range_cfg lt9611_ranges[] = {
  68         {
  69                 .name = "register_range",
  70                 .range_min =  0,
  71                 .range_max = 0x85ff,
  72                 .selector_reg = LT9611_PAGE_CONTROL,
  73                 .selector_mask = 0xff,
  74                 .selector_shift = 0,
  75                 .window_start = 0,
  76                 .window_len = 0x100,
  77         },
  78 };
  79
  80 static const struct regmap_config lt9611_regmap_config = {
  81         .reg_bits = 8,
  82         .val_bits = 8,
  83         .max_register = 0xffff,
  84         .ranges = lt9611_ranges,
  85         .num_ranges = ARRAY_SIZE(lt9611_ranges),
  86 };
  87
  88 static struct lt9611 *bridge_to_lt9611(struct drm_bridge *bridge)
  89 {
  90         return container_of(bridge, struct lt9611, bridge);
  91 }
  92
  93 static int lt9611_mipi_input_analog(struct lt9611 *lt9611)
  94 {
  95         const struct reg_sequence reg_cfg[] = {
  96                 { 0x8106, 0x40 }, /* port A rx current */
  97                 { 0x810a, 0xfe }, /* port A ldo voltage set */
  98                 { 0x810b, 0xbf }, /* enable port A lprx */
  99                 { 0x8111, 0x40 }, /* port B rx current */
 100                 { 0x8115, 0xfe }, /* port B ldo voltage set */
 101                 { 0x8116, 0xbf }, /* enable port B lprx */
 102
 103                 { 0x811c, 0x03 }, /* PortA clk lane no-LP mode */
 104                 { 0x8120, 0x03 }, /* PortB clk lane with-LP mode */
 105         };
 106
 107         return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 108 }
 109
 110 static int lt9611_mipi_input_digital(struct lt9611 *lt9611,
 111                                      const struct drm_display_mode *mode)
 112 {
 113         struct reg_sequence reg_cfg[] = {
 114                 { 0x8300, LT9611_4LANES },
 115                 { 0x830a, 0x00 },
 116                 { 0x824f, 0x80 },
 117                 { 0x8250, 0x10 },
 118                 { 0x8302, 0x0a },
 119                 { 0x8306, 0x0a },
 120         };
 121
 122         if (lt9611->dsi1_node)
 123                 reg_cfg[1].def = 0x03;
 124
 125         return regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 126 }
 127
 128 static void lt9611_mipi_video_setup(struct lt9611 *lt9611,
 129                                     const struct drm_display_mode *mode)
 130 {
 131         u32 h_total, hactive, hsync_len, hfront_porch, hsync_porch;
 132         u32 v_total, vactive, vsync_len, vfront_porch, vsync_porch;
 133
 134         h_total = mode->htotal;
 135         v_total = mode->vtotal;
 136
 137         hactive = mode->hdisplay;
 138         hsync_len = mode->hsync_end - mode->hsync_start;
 139         hfront_porch = mode->hsync_start - mode->hdisplay;
 140         hsync_porch = mode->htotal - mode->hsync_start;
 141
 142         vactive = mode->vdisplay;
 143         vsync_len = mode->vsync_end - mode->vsync_start;
 144         vfront_porch = mode->vsync_start - mode->vdisplay;
 145         vsync_porch = mode->vtotal - mode->vsync_start;
 146
 147         regmap_write(lt9611->regmap, 0x830d, (u8)(v_total / 256));
 148         regmap_write(lt9611->regmap, 0x830e, (u8)(v_total % 256));
 149
 150         regmap_write(lt9611->regmap, 0x830f, (u8)(vactive / 256));
 151         regmap_write(lt9611->regmap, 0x8310, (u8)(vactive % 256));
 152
 153         regmap_write(lt9611->regmap, 0x8311, (u8)(h_total / 256));
 154         regmap_write(lt9611->regmap, 0x8312, (u8)(h_total % 256));
 155
 156         regmap_write(lt9611->regmap, 0x8313, (u8)(hactive / 256));
 157         regmap_write(lt9611->regmap, 0x8314, (u8)(hactive % 256));
 158
 159         regmap_write(lt9611->regmap, 0x8315, (u8)(vsync_len % 256));
 160         regmap_write(lt9611->regmap, 0x8316, (u8)(hsync_len % 256));
 161
 162         regmap_write(lt9611->regmap, 0x8317, (u8)(vfront_porch % 256));
 163
 164         regmap_write(lt9611->regmap, 0x8318, (u8)(vsync_porch % 256));
 165
 166         regmap_write(lt9611->regmap, 0x8319, (u8)(hfront_porch % 256));
 167
 168         regmap_write(lt9611->regmap, 0x831a, (u8)(hsync_porch / 256) |
 169                                                 ((hfront_porch / 256) << 4));
 170         regmap_write(lt9611->regmap, 0x831b, (u8)(hsync_porch % 256));
 171 }
 172
 173 static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode, unsigned int postdiv)
 174 {
 175         unsigned int pcr_m = mode->clock * 5 * postdiv / 27000;
 176         const struct reg_sequence reg_cfg[] = {
 177                 { 0x830b, 0x01 },
 178                 { 0x830c, 0x10 },
 179                 { 0x8348, 0x00 },
 180                 { 0x8349, 0x81 },
 181
 182                 /* stage 1 */
 183                 { 0x8321, 0x4a },
 184                 { 0x8324, 0x71 },
 185                 { 0x8325, 0x30 },
 186                 { 0x832a, 0x01 },
 187
 188                 /* stage 2 */
 189                 { 0x834a, 0x40 },
 190
 191                 /* MK limit */
 192                 { 0x832d, 0x38 },
 193                 { 0x8331, 0x08 },
 194         };
 195         u8 pol = 0x10;
 196
 197         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
 198                 pol |= 0x2;
 199         if (mode->flags & DRM_MODE_FLAG_NVSYNC)
 200                 pol |= 0x1;
 201         regmap_write(lt9611->regmap, 0x831d, pol);
 202
 203         regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 204         if (lt9611->dsi1_node) {
 205                 unsigned int hact = mode->hdisplay;
 206
 207                 hact >>= 2;
 208                 hact += 0x50;
 209                 hact = min(hact, 0x3e0U);
 210                 regmap_write(lt9611->regmap, 0x830b, hact / 256);
 211                 regmap_write(lt9611->regmap, 0x830c, hact % 256);
 212                 regmap_write(lt9611->regmap, 0x8348, hact / 256);
 213                 regmap_write(lt9611->regmap, 0x8349, hact % 256);
 214         }
 215
 216         regmap_write(lt9611->regmap, 0x8326, pcr_m);
 217
 218         /* pcr rst */
 219         regmap_write(lt9611->regmap, 0x8011, 0x5a);
 220         regmap_write(lt9611->regmap, 0x8011, 0xfa);
 221 }
 222
 223 static int lt9611_pll_setup(struct lt9611 *lt9611, const struct drm_display_mode *mode, unsigned int *postdiv)
 224 {
 225         unsigned int pclk = mode->clock;
 226         const struct reg_sequence reg_cfg[] = {
 227                 /* txpll init */
 228                 { 0x8123, 0x40 },
 229                 { 0x8124, 0x64 },
 230                 { 0x8125, 0x80 },
 231                 { 0x8126, 0x55 },
 232                 { 0x812c, 0x37 },
 233                 { 0x812f, 0x01 },
 234                 { 0x8126, 0x55 },
 235                 { 0x8127, 0x66 },
 236                 { 0x8128, 0x88 },
 237                 { 0x812a, 0x20 },
 238         };
 239
 240         regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 241
 242         if (pclk > 150000) {
 243                 regmap_write(lt9611->regmap, 0x812d, 0x88);
 244                 *postdiv = 1;
 245         } else if (pclk > 70000) {
 246                 regmap_write(lt9611->regmap, 0x812d, 0x99);
 247                 *postdiv = 2;
 248         } else {
 249                 regmap_write(lt9611->regmap, 0x812d, 0xaa);
 250                 *postdiv = 4;
 251         }
 252
 253         /*
 254          * first divide pclk by 2 first
 255          *  - write divide by 64k to 19:16 bits which means shift by 17
 256          *  - write divide by 256 to 15:8 bits which means shift by 9
 257          *  - write remainder to 7:0 bits, which means shift by 1
 258          */
 259         regmap_write(lt9611->regmap, 0x82e3, pclk >> 17); /* pclk[19:16] */
 260         regmap_write(lt9611->regmap, 0x82e4, pclk >> 9);  /* pclk[15:8]  */
 261         regmap_write(lt9611->regmap, 0x82e5, pclk >> 1);  /* pclk[7:0]   */
 262
 263         regmap_write(lt9611->regmap, 0x82de, 0x20);
 264         regmap_write(lt9611->regmap, 0x82de, 0xe0);
 265
 266         regmap_write(lt9611->regmap, 0x8016, 0xf1);
 267         regmap_write(lt9611->regmap, 0x8016, 0xf3);
 268
 269         return 0;
 270 }
 271
 272 static int lt9611_read_video_check(struct lt9611 *lt9611, unsigned int reg)
 273 {
 274         unsigned int temp, temp2;
 275         int ret;
 276
 277         ret = regmap_read(lt9611->regmap, reg, &temp);
 278         if (ret)
 279                 return ret;
 280         temp <<= 8;
 281         ret = regmap_read(lt9611->regmap, reg + 1, &temp2);
 282         if (ret)
 283                 return ret;
 284
 285         return (temp + temp2);
 286 }
 287
 288 static int lt9611_video_check(struct lt9611 *lt9611)
 289 {
 290         u32 v_total, vactive, hactive_a, hactive_b, h_total_sysclk;
 291         int temp;
 292
 293         /* top module video check */
 294
 295         /* vactive */
 296         temp = lt9611_read_video_check(lt9611, 0x8282);
 297         if (temp < 0)
 298                 goto end;
 299         vactive = temp;
 300
 301         /* v_total */
 302         temp = lt9611_read_video_check(lt9611, 0x826c);
 303         if (temp < 0)
 304                 goto end;
 305         v_total = temp;
 306
 307         /* h_total_sysclk */
 308         temp = lt9611_read_video_check(lt9611, 0x8286);
 309         if (temp < 0)
 310                 goto end;
 311         h_total_sysclk = temp;
 312
 313         /* hactive_a */
 314         temp = lt9611_read_video_check(lt9611, 0x8382);
 315         if (temp < 0)
 316                 goto end;
 317         hactive_a = temp / 3;
 318
 319         /* hactive_b */
 320         temp = lt9611_read_video_check(lt9611, 0x8386);
 321         if (temp < 0)
 322                 goto end;
 323         hactive_b = temp / 3;
 324
 325         dev_info(lt9611->dev,
 326                  "video check: hactive_a=%d, hactive_b=%d, vactive=%d, v_total=%d, h_total_sysclk=%d\n",
 327                  hactive_a, hactive_b, vactive, v_total, h_total_sysclk);
 328
 329         return 0;
 330
 331 end:
 332         dev_err(lt9611->dev, "read video check error\n");
 333         return temp;
 334 }
 335
 336 static void lt9611_hdmi_set_infoframes(struct lt9611 *lt9611,
 337                                        struct drm_connector *connector,
 338                                        struct drm_display_mode *mode)
 339 {
 340         union hdmi_infoframe infoframe;
 341         ssize_t len;
 342         u8 iframes = 0x0a; /* UD1 infoframe */
 343         u8 buf[32];
 344         int ret;
 345         int i;
 346
 347         ret = drm_hdmi_avi_infoframe_from_display_mode(&infoframe.avi,
 348                                                        connector,
 349                                                        mode);
 350         if (ret < 0)
 351                 goto out;
 352
 353         len = hdmi_infoframe_pack(&infoframe, buf, sizeof(buf));
 354         if (len < 0)
 355                 goto out;
 356
 357         for (i = 0; i < len; i++)
 358                 regmap_write(lt9611->regmap, 0x8440 + i, buf[i]);
 359
 360         ret = drm_hdmi_vendor_infoframe_from_display_mode(&infoframe.vendor.hdmi,
 361                                                           connector,
 362                                                           mode);
 363         if (ret < 0)
 364                 goto out;
 365
 366         len = hdmi_infoframe_pack(&infoframe, buf, sizeof(buf));
 367         if (len < 0)
 368                 goto out;
 369
 370         for (i = 0; i < len; i++)
 371                 regmap_write(lt9611->regmap, 0x8474 + i, buf[i]);
 372
 373         iframes |= 0x20;
 374
 375 out:
 376         regmap_write(lt9611->regmap, 0x843d, iframes); /* UD1 infoframe */
 377 }
 378
 379 static void lt9611_hdmi_tx_digital(struct lt9611 *lt9611, bool is_hdmi)
 380 {
 381         if (is_hdmi)
 382                 regmap_write(lt9611->regmap, 0x82d6, 0x8c);
 383         else
 384                 regmap_write(lt9611->regmap, 0x82d6, 0x0c);
 385         regmap_write(lt9611->regmap, 0x82d7, 0x04);
 386 }
 387
 388 static void lt9611_hdmi_tx_phy(struct lt9611 *lt9611)
 389 {
 390         struct reg_sequence reg_cfg[] = {
 391                 { 0x8130, 0x6a },
 392                 { 0x8131, 0x44 }, /* HDMI DC mode */
 393                 { 0x8132, 0x4a },
 394                 { 0x8133, 0x0b },
 395                 { 0x8134, 0x00 },
 396                 { 0x8135, 0x00 },
 397                 { 0x8136, 0x00 },
 398                 { 0x8137, 0x44 },
 399                 { 0x813f, 0x0f },
 400                 { 0x8140, 0xa0 },
 401                 { 0x8141, 0xa0 },
 402                 { 0x8142, 0xa0 },
 403                 { 0x8143, 0xa0 },
 404                 { 0x8144, 0x0a },
 405         };
 406
 407         /* HDMI AC mode */
 408         if (lt9611->ac_mode)
 409                 reg_cfg[2].def = 0x73;
 410
 411         regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 412 }
 413
 414 static irqreturn_t lt9611_irq_thread_handler(int irq, void *dev_id)
 415 {
 416         struct lt9611 *lt9611 = dev_id;
 417         unsigned int irq_flag0 = 0;
 418         unsigned int irq_flag3 = 0;
 419
 420         regmap_read(lt9611->regmap, 0x820f, &irq_flag3);
 421         regmap_read(lt9611->regmap, 0x820c, &irq_flag0);
 422
 423         /* hpd changed low */
 424         if (irq_flag3 & 0x80) {
 425                 dev_info(lt9611->dev, "hdmi cable disconnected\n");
 426
 427                 regmap_write(lt9611->regmap, 0x8207, 0xbf);
 428                 regmap_write(lt9611->regmap, 0x8207, 0x3f);
 429         }
 430
 431         /* hpd changed high */
 432         if (irq_flag3 & 0x40) {
 433                 dev_info(lt9611->dev, "hdmi cable connected\n");
 434
 435                 regmap_write(lt9611->regmap, 0x8207, 0x7f);
 436                 regmap_write(lt9611->regmap, 0x8207, 0x3f);
 437         }
 438
 439         if (irq_flag3 & 0xc0 && lt9611->bridge.dev)
 440                 drm_kms_helper_hotplug_event(lt9611->bridge.dev);
 441
 442         /* video input changed */
 443         if (irq_flag0 & 0x01) {
 444                 dev_info(lt9611->dev, "video input changed\n");
 445                 regmap_write(lt9611->regmap, 0x829e, 0xff);
 446                 regmap_write(lt9611->regmap, 0x829e, 0xf7);
 447                 regmap_write(lt9611->regmap, 0x8204, 0xff);
 448                 regmap_write(lt9611->regmap, 0x8204, 0xfe);
 449         }
 450
 451         return IRQ_HANDLED;
 452 }
 453
 454 static void lt9611_enable_hpd_interrupts(struct lt9611 *lt9611)
 455 {
 456         unsigned int val;
 457
 458         regmap_read(lt9611->regmap, 0x8203, &val);
 459
 460         val &= ~0xc0;
 461         regmap_write(lt9611->regmap, 0x8203, val);
 462         regmap_write(lt9611->regmap, 0x8207, 0xff); /* clear */
 463         regmap_write(lt9611->regmap, 0x8207, 0x3f);
 464 }
 465
 466 static void lt9611_sleep_setup(struct lt9611 *lt9611)
 467 {
 468         const struct reg_sequence sleep_setup[] = {
 469                 { 0x8024, 0x76 },
 470                 { 0x8023, 0x01 },
 471                 { 0x8157, 0x03 }, /* set addr pin as output */
 472                 { 0x8149, 0x0b },
 473
 474                 { 0x8102, 0x48 }, /* MIPI Rx power down */
 475                 { 0x8123, 0x80 },
 476                 { 0x8130, 0x00 },
 477                 { 0x8011, 0x0a },
 478         };
 479
 480         regmap_multi_reg_write(lt9611->regmap,
 481                                sleep_setup, ARRAY_SIZE(sleep_setup));
 482         lt9611->sleep = true;
 483 }
 484
 485 static int lt9611_power_on(struct lt9611 *lt9611)
 486 {
 487         int ret;
 488         const struct reg_sequence seq[] = {
 489                 /* LT9611_System_Init */
 490                 { 0x8101, 0x18 }, /* sel xtal clock */
 491
 492                 /* timer for frequency meter */
 493                 { 0x821b, 0x69 }, /* timer 2 */
 494                 { 0x821c, 0x78 },
 495                 { 0x82cb, 0x69 }, /* timer 1 */
 496                 { 0x82cc, 0x78 },
 497
 498                 /* irq init */
 499                 { 0x8251, 0x01 },
 500                 { 0x8258, 0x0a }, /* hpd irq */
 501                 { 0x8259, 0x80 }, /* hpd debounce width */
 502                 { 0x829e, 0xf7 }, /* video check irq */
 503
 504                 /* power consumption for work */
 505                 { 0x8004, 0xf0 },
 506                 { 0x8006, 0xf0 },
 507                 { 0x800a, 0x80 },
 508                 { 0x800b, 0x40 },
 509                 { 0x800d, 0xef },
 510                 { 0x8011, 0xfa },
 511         };
 512
 513         if (lt9611->power_on)
 514                 return 0;
 515
 516         ret = regmap_multi_reg_write(lt9611->regmap, seq, ARRAY_SIZE(seq));
 517         if (!ret)
 518                 lt9611->power_on = true;
 519
 520         return ret;
 521 }
 522
 523 static int lt9611_power_off(struct lt9611 *lt9611)
 524 {
 525         int ret;
 526
 527         ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
 528         if (!ret)
 529                 lt9611->power_on = false;
 530
 531         return ret;
 532 }
 533
 534 static void lt9611_reset(struct lt9611 *lt9611)
 535 {
 536         gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
 537         msleep(20);
 538
 539         gpiod_set_value_cansleep(lt9611->reset_gpio, 0);
 540         msleep(20);
 541
 542         gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
 543         msleep(100);
 544 }
 545
 546 static void lt9611_assert_5v(struct lt9611 *lt9611)
 547 {
 548         if (!lt9611->enable_gpio)
 549                 return;
 550
 551         gpiod_set_value_cansleep(lt9611->enable_gpio, 1);
 552         msleep(20);
 553 }
 554
 555 static int lt9611_regulator_init(struct lt9611 *lt9611)
 556 {
 557         int ret;
 558
 559         lt9611->supplies[0].supply = "vdd";
 560         lt9611->supplies[1].supply = "vcc";
 561
 562         ret = devm_regulator_bulk_get(lt9611->dev, 2, lt9611->supplies);
 563         if (ret < 0)
 564                 return ret;
 565
 566         return regulator_set_load(lt9611->supplies[0].consumer, 300000);
 567 }
 568
 569 static int lt9611_regulator_enable(struct lt9611 *lt9611)
 570 {
 571         int ret;
 572
 573         ret = regulator_enable(lt9611->supplies[0].consumer);
 574         if (ret < 0)
 575                 return ret;
 576
 577         usleep_range(1000, 10000);
 578
 579         ret = regulator_enable(lt9611->supplies[1].consumer);
 580         if (ret < 0) {
 581                 regulator_disable(lt9611->supplies[0].consumer);
 582                 return ret;
 583         }
 584
 585         return 0;
 586 }
 587
 588 static enum drm_connector_status lt9611_bridge_detect(struct drm_bridge *bridge)
 589 {
 590         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 591         unsigned int reg_val = 0;
 592         int connected = 0;
 593
 594         regmap_read(lt9611->regmap, 0x825e, &reg_val);
 595         connected  = (reg_val & (BIT(2) | BIT(0)));
 596
 597         lt9611->status = connected ?  connector_status_connected :
 598                                 connector_status_disconnected;
 599
 600         return lt9611->status;
 601 }
 602
 603 static int lt9611_read_edid(struct lt9611 *lt9611)
 604 {
 605         unsigned int temp;
 606         int ret = 0;
 607         int i, j;
 608
 609         /* memset to clear old buffer, if any */
 610         memset(lt9611->edid_buf, 0, sizeof(lt9611->edid_buf));
 611
 612         regmap_write(lt9611->regmap, 0x8503, 0xc9);
 613
 614         /* 0xA0 is EDID device address */
 615         regmap_write(lt9611->regmap, 0x8504, 0xa0);
 616         /* 0x00 is EDID offset address */
 617         regmap_write(lt9611->regmap, 0x8505, 0x00);
 618
 619         /* length for read */
 620         regmap_write(lt9611->regmap, 0x8506, EDID_LEN);
 621         regmap_write(lt9611->regmap, 0x8514, 0x7f);
 622
 623         for (i = 0; i < EDID_LOOP; i++) {
 624                 /* offset address */
 625                 regmap_write(lt9611->regmap, 0x8505, i * EDID_LEN);
 626                 regmap_write(lt9611->regmap, 0x8507, 0x36);
 627                 regmap_write(lt9611->regmap, 0x8507, 0x31);
 628                 regmap_write(lt9611->regmap, 0x8507, 0x37);
 629                 usleep_range(5000, 10000);
 630
 631                 regmap_read(lt9611->regmap, 0x8540, &temp);
 632
 633                 if (temp & KEY_DDC_ACCS_DONE) {
 634                         for (j = 0; j < EDID_LEN; j++) {
 635                                 regmap_read(lt9611->regmap, 0x8583, &temp);
 636                                 lt9611->edid_buf[i * EDID_LEN + j] = temp;
 637                         }
 638
 639                 } else if (temp & DDC_NO_ACK) { /* DDC No Ack or Abitration lost */
 640                         dev_err(lt9611->dev, "read edid failed: no ack\n");
 641                         ret = -EIO;
 642                         goto end;
 643
 644                 } else {
 645                         dev_err(lt9611->dev, "read edid failed: access not done\n");
 646                         ret = -EIO;
 647                         goto end;
 648                 }
 649         }
 650
 651 end:
 652         regmap_write(lt9611->regmap, 0x8507, 0x1f);
 653         return ret;
 654 }
 655
 656 static int
 657 lt9611_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
 658 {
 659         struct lt9611 *lt9611 = data;
 660         int ret;
 661
 662         if (len > 128)
 663                 return -EINVAL;
 664
 665         /* supports up to 1 extension block */
 666         /* TODO: add support for more extension blocks */
 667         if (block > 1)
 668                 return -EINVAL;
 669
 670         if (block == 0) {
 671                 ret = lt9611_read_edid(lt9611);
 672                 if (ret) {
 673                         dev_err(lt9611->dev, "edid read failed\n");
 674                         return ret;
 675                 }
 676         }
 677
 678         block %= 2;
 679         memcpy(buf, lt9611->edid_buf + (block * 128), len);
 680
 681         return 0;
 682 }
 683
 684 /* bridge funcs */
 685 static void
 686 lt9611_bridge_atomic_enable(struct drm_bridge *bridge,
 687                             struct drm_bridge_state *old_bridge_state)
 688 {
 689         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 690         struct drm_atomic_state *state = old_bridge_state->base.state;
 691         struct drm_connector *connector;
 692         struct drm_connector_state *conn_state;
 693         struct drm_crtc_state *crtc_state;
 694         struct drm_display_mode *mode;
 695         unsigned int postdiv;
 696
 697         connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
 698         if (WARN_ON(!connector))
 699                 return;
 700
 701         conn_state = drm_atomic_get_new_connector_state(state, connector);
 702         if (WARN_ON(!conn_state))
 703                 return;
 704
 705         crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
 706         if (WARN_ON(!crtc_state))
 707                 return;
 708
 709         mode = &crtc_state->adjusted_mode;
 710
 711         lt9611_mipi_input_digital(lt9611, mode);
 712         lt9611_pll_setup(lt9611, mode, &postdiv);
 713         lt9611_mipi_video_setup(lt9611, mode);
 714         lt9611_pcr_setup(lt9611, mode, postdiv);
 715
 716         if (lt9611_power_on(lt9611)) {
 717                 dev_err(lt9611->dev, "power on failed\n");
 718                 return;
 719         }
 720
 721         lt9611_mipi_input_analog(lt9611);
 722         lt9611_hdmi_set_infoframes(lt9611, connector, mode);
 723         lt9611_hdmi_tx_digital(lt9611, connector->display_info.is_hdmi);
 724         lt9611_hdmi_tx_phy(lt9611);
 725
 726         msleep(500);
 727
 728         lt9611_video_check(lt9611);
 729
 730         /* Enable HDMI output */
 731         regmap_write(lt9611->regmap, 0x8130, 0xea);
 732 }
 733
 734 static void
 735 lt9611_bridge_atomic_disable(struct drm_bridge *bridge,
 736                              struct drm_bridge_state *old_bridge_state)
 737 {
 738         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 739         int ret;
 740
 741         /* Disable HDMI output */
 742         ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
 743         if (ret) {
 744                 dev_err(lt9611->dev, "video on failed\n");
 745                 return;
 746         }
 747
 748         if (lt9611_power_off(lt9611)) {
 749                 dev_err(lt9611->dev, "power on failed\n");
 750                 return;
 751         }
 752 }
 753
 754 static struct mipi_dsi_device *lt9611_attach_dsi(struct lt9611 *lt9611,
 755                                                  struct device_node *dsi_node)
 756 {
 757         const struct mipi_dsi_device_info info = { "lt9611", 0, lt9611->dev->of_node};
 758         struct mipi_dsi_device *dsi;
 759         struct mipi_dsi_host *host;
 760         struct device *dev = lt9611->dev;
 761         int ret;
 762
 763         host = of_find_mipi_dsi_host_by_node(dsi_node);
 764         if (!host)
 765                 return ERR_PTR(dev_err_probe(lt9611->dev, -EPROBE_DEFER, "failed to find dsi host\n"));
 766
 767         dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
 768         if (IS_ERR(dsi)) {
 769                 dev_err(lt9611->dev, "failed to create dsi device\n");
 770                 return dsi;
 771         }
 772
 773         dsi->lanes = 4;
 774         dsi->format = MIPI_DSI_FMT_RGB888;
 775         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
 776                           MIPI_DSI_MODE_VIDEO_HSE;
 777
 778         ret = devm_mipi_dsi_attach(dev, dsi);
 779         if (ret < 0) {
 780                 dev_err(dev, "failed to attach dsi to host\n");
 781                 return ERR_PTR(ret);
 782         }
 783
 784         return dsi;
 785 }
 786
 787 static int lt9611_bridge_attach(struct drm_bridge *bridge,
 788                                 enum drm_bridge_attach_flags flags)
 789 {
 790         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 791
 792         return drm_bridge_attach(bridge->encoder, lt9611->next_bridge,
 793                                  bridge, flags);
 794 }
 795
 796 static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge,
 797                                                      const struct drm_display_info *info,
 798                                                      const struct drm_display_mode *mode)
 799 {
 800         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 801
 802         if (mode->hdisplay > 3840)
 803                 return MODE_BAD_HVALUE;
 804
 805         if (mode->vdisplay > 2160)
 806                 return MODE_BAD_VVALUE;
 807
 808         if (mode->hdisplay == 3840 &&
 809             mode->vdisplay == 2160 &&
 810             drm_mode_vrefresh(mode) > 30)
 811                 return MODE_CLOCK_HIGH;
 812
 813         if (mode->hdisplay > 2000 && !lt9611->dsi1_node)
 814                 return MODE_PANEL;
 815         else
 816                 return MODE_OK;
 817 }
 818
 819 static void lt9611_bridge_atomic_pre_enable(struct drm_bridge *bridge,
 820                                             struct drm_bridge_state *old_bridge_state)
 821 {
 822         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 823         static const struct reg_sequence reg_cfg[] = {
 824                 { 0x8102, 0x12 },
 825                 { 0x8123, 0x40 },
 826                 { 0x8130, 0xea },
 827                 { 0x8011, 0xfa },
 828         };
 829
 830         if (!lt9611->sleep)
 831                 return;
 832
 833         regmap_multi_reg_write(lt9611->regmap,
 834                                reg_cfg, ARRAY_SIZE(reg_cfg));
 835
 836         lt9611->sleep = false;
 837 }
 838
 839 static void
 840 lt9611_bridge_atomic_post_disable(struct drm_bridge *bridge,
 841                                   struct drm_bridge_state *old_bridge_state)
 842 {
 843         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 844
 845         lt9611_sleep_setup(lt9611);
 846 }
 847
 848 static const struct drm_edid *lt9611_bridge_edid_read(struct drm_bridge *bridge,
 849                                                       struct drm_connector *connector)
 850 {
 851         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 852
 853         lt9611_power_on(lt9611);
 854         return drm_edid_read_custom(connector, lt9611_get_edid_block, lt9611);
 855 }
 856
 857 static void lt9611_bridge_hpd_enable(struct drm_bridge *bridge)
 858 {
 859         struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
 860
 861         lt9611_enable_hpd_interrupts(lt9611);
 862 }
 863
 864 #define MAX_INPUT_SEL_FORMATS   1
 865
 866 static u32 *
 867 lt9611_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
 868                                  struct drm_bridge_state *bridge_state,
 869                                  struct drm_crtc_state *crtc_state,
 870                                  struct drm_connector_state *conn_state,
 871                                  u32 output_fmt,
 872                                  unsigned int *num_input_fmts)
 873 {
 874         u32 *input_fmts;
 875
 876         *num_input_fmts = 0;
 877
 878         input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
 879                              GFP_KERNEL);
 880         if (!input_fmts)
 881                 return NULL;
 882
 883         /* This is the DSI-end bus format */
 884         input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
 885         *num_input_fmts = 1;
 886
 887         return input_fmts;
 888 }
 889
 890 static const struct drm_bridge_funcs lt9611_bridge_funcs = {
 891         .attach = lt9611_bridge_attach,
 892         .mode_valid = lt9611_bridge_mode_valid,
 893         .detect = lt9611_bridge_detect,
 894         .edid_read = lt9611_bridge_edid_read,
 895         .hpd_enable = lt9611_bridge_hpd_enable,
 896
 897         .atomic_pre_enable = lt9611_bridge_atomic_pre_enable,
 898         .atomic_enable = lt9611_bridge_atomic_enable,
 899         .atomic_disable = lt9611_bridge_atomic_disable,
 900         .atomic_post_disable = lt9611_bridge_atomic_post_disable,
 901         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 902         .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 903         .atomic_reset = drm_atomic_helper_bridge_reset,
 904         .atomic_get_input_bus_fmts = lt9611_atomic_get_input_bus_fmts,
 905 };
 906
 907 static int lt9611_parse_dt(struct device *dev,
 908                            struct lt9611 *lt9611)
 909 {
 910         lt9611->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
 911         if (!lt9611->dsi0_node) {
 912                 dev_err(lt9611->dev, "failed to get remote node for primary dsi\n");
 913                 return -ENODEV;
 914         }
 915
 916         lt9611->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
 917
 918         lt9611->ac_mode = of_property_read_bool(dev->of_node, "lt,ac-mode");
 919
 920         return drm_of_find_panel_or_bridge(dev->of_node, 2, -1, NULL, &lt9611->next_bridge);
 921 }
 922
 923 static int lt9611_gpio_init(struct lt9611 *lt9611)
 924 {
 925         struct device *dev = lt9611->dev;
 926
 927         lt9611->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
 928         if (IS_ERR(lt9611->reset_gpio)) {
 929                 dev_err(dev, "failed to acquire reset gpio\n");
 930                 return PTR_ERR(lt9611->reset_gpio);
 931         }
 932
 933         lt9611->enable_gpio = devm_gpiod_get_optional(dev, "enable",
 934                                                       GPIOD_OUT_LOW);
 935         if (IS_ERR(lt9611->enable_gpio)) {
 936                 dev_err(dev, "failed to acquire enable gpio\n");
 937                 return PTR_ERR(lt9611->enable_gpio);
 938         }
 939
 940         return 0;
 941 }
 942
 943 static int lt9611_read_device_rev(struct lt9611 *lt9611)
 944 {
 945         unsigned int rev;
 946         int ret;
 947
 948         regmap_write(lt9611->regmap, 0x80ee, 0x01);
 949         ret = regmap_read(lt9611->regmap, 0x8002, &rev);
 950         if (ret)
 951                 dev_err(lt9611->dev, "failed to read revision: %d\n", ret);
 952         else
 953                 dev_info(lt9611->dev, "LT9611 revision: 0x%x\n", rev);
 954
 955         return ret;
 956 }
 957
 958 static int lt9611_hdmi_hw_params(struct device *dev, void *data,
 959                                  struct hdmi_codec_daifmt *fmt,
 960                                  struct hdmi_codec_params *hparms)
 961 {
 962         struct lt9611 *lt9611 = data;
 963
 964         if (hparms->sample_rate == 48000)
 965                 regmap_write(lt9611->regmap, 0x840f, 0x2b);
 966         else if (hparms->sample_rate == 96000)
 967                 regmap_write(lt9611->regmap, 0x840f, 0xab);
 968         else
 969                 return -EINVAL;
 970
 971         regmap_write(lt9611->regmap, 0x8435, 0x00);
 972         regmap_write(lt9611->regmap, 0x8436, 0x18);
 973         regmap_write(lt9611->regmap, 0x8437, 0x00);
 974
 975         return 0;
 976 }
 977
 978 static int lt9611_audio_startup(struct device *dev, void *data)
 979 {
 980         struct lt9611 *lt9611 = data;
 981
 982         regmap_write(lt9611->regmap, 0x82d6, 0x8c);
 983         regmap_write(lt9611->regmap, 0x82d7, 0x04);
 984
 985         regmap_write(lt9611->regmap, 0x8406, 0x08);
 986         regmap_write(lt9611->regmap, 0x8407, 0x10);
 987
 988         regmap_write(lt9611->regmap, 0x8434, 0xd5);
 989
 990         return 0;
 991 }
 992
 993 static void lt9611_audio_shutdown(struct device *dev, void *data)
 994 {
 995         struct lt9611 *lt9611 = data;
 996
 997         regmap_write(lt9611->regmap, 0x8406, 0x00);
 998         regmap_write(lt9611->regmap, 0x8407, 0x00);
 999 }
1000
1001 static int lt9611_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
1002                                       struct device_node *endpoint)
1003 {
1004         struct of_endpoint of_ep;
1005         int ret;
1006
1007         ret = of_graph_parse_endpoint(endpoint, &of_ep);
1008         if (ret < 0)
1009                 return ret;
1010
1011         /*
1012          * HDMI sound should be located as reg = <2>
1013          * Then, it is sound port 0
1014          */
1015         if (of_ep.port == 2)
1016                 return 0;
1017
1018         return -EINVAL;
1019 }
1020
1021 static const struct hdmi_codec_ops lt9611_codec_ops = {
1022         .hw_params      = lt9611_hdmi_hw_params,
1023         .audio_shutdown = lt9611_audio_shutdown,
1024         .audio_startup  = lt9611_audio_startup,
1025         .get_dai_id     = lt9611_hdmi_i2s_get_dai_id,
1026 };
1027
1028 static struct hdmi_codec_pdata codec_data = {
1029         .ops = &lt9611_codec_ops,
1030         .max_i2s_channels = 8,
1031         .i2s = 1,
1032 };
1033
1034 static int lt9611_audio_init(struct device *dev, struct lt9611 *lt9611)
1035 {
1036         codec_data.data = lt9611;
1037         lt9611->audio_pdev =
1038                 platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
1039                                               PLATFORM_DEVID_AUTO,
1040                                               &codec_data, sizeof(codec_data));
1041
1042         return PTR_ERR_OR_ZERO(lt9611->audio_pdev);
1043 }
1044
1045 static void lt9611_audio_exit(struct lt9611 *lt9611)
1046 {
1047         if (lt9611->audio_pdev) {
1048                 platform_device_unregister(lt9611->audio_pdev);
1049                 lt9611->audio_pdev = NULL;
1050         }
1051 }
1052
1053 static int lt9611_probe(struct i2c_client *client)
1054 {
1055         struct lt9611 *lt9611;
1056         struct device *dev = &client->dev;
1057         int ret;
1058
1059         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1060                 dev_err(dev, "device doesn't support I2C\n");
1061                 return -ENODEV;
1062         }
1063
1064         lt9611 = devm_kzalloc(dev, sizeof(*lt9611), GFP_KERNEL);
1065         if (!lt9611)
1066                 return -ENOMEM;
1067
1068         lt9611->dev = dev;
1069         lt9611->client = client;
1070         lt9611->sleep = false;
1071
1072         lt9611->regmap = devm_regmap_init_i2c(client, &lt9611_regmap_config);
1073         if (IS_ERR(lt9611->regmap)) {
1074                 dev_err(lt9611->dev, "regmap i2c init failed\n");
1075                 return PTR_ERR(lt9611->regmap);
1076         }
1077
1078         ret = lt9611_parse_dt(dev, lt9611);
1079         if (ret) {
1080                 dev_err(dev, "failed to parse device tree\n");
1081                 return ret;
1082         }
1083
1084         ret = lt9611_gpio_init(lt9611);
1085         if (ret < 0)
1086                 goto err_of_put;
1087
1088         ret = lt9611_regulator_init(lt9611);
1089         if (ret < 0)
1090                 goto err_of_put;
1091
1092         lt9611_assert_5v(lt9611);
1093
1094         ret = lt9611_regulator_enable(lt9611);
1095         if (ret)
1096                 goto err_of_put;
1097
1098         lt9611_reset(lt9611);
1099
1100         ret = lt9611_read_device_rev(lt9611);
1101         if (ret) {
1102                 dev_err(dev, "failed to read chip rev\n");
1103                 goto err_disable_regulators;
1104         }
1105
1106         ret = devm_request_threaded_irq(dev, client->irq, NULL,
1107                                         lt9611_irq_thread_handler,
1108                                         IRQF_ONESHOT, "lt9611", lt9611);
1109         if (ret) {
1110                 dev_err(dev, "failed to request irq\n");
1111                 goto err_disable_regulators;
1112         }
1113
1114         i2c_set_clientdata(client, lt9611);
1115
1116         lt9611->bridge.funcs = &lt9611_bridge_funcs;
1117         lt9611->bridge.of_node = client->dev.of_node;
1118         lt9611->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
1119                              DRM_BRIDGE_OP_HPD | DRM_BRIDGE_OP_MODES;
1120         lt9611->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
1121
1122         drm_bridge_add(&lt9611->bridge);
1123
1124         /* Attach primary DSI */
1125         lt9611->dsi0 = lt9611_attach_dsi(lt9611, lt9611->dsi0_node);
1126         if (IS_ERR(lt9611->dsi0)) {
1127                 ret = PTR_ERR(lt9611->dsi0);
1128                 goto err_remove_bridge;
1129         }
1130
1131         /* Attach secondary DSI, if specified */
1132         if (lt9611->dsi1_node) {
1133                 lt9611->dsi1 = lt9611_attach_dsi(lt9611, lt9611->dsi1_node);
1134                 if (IS_ERR(lt9611->dsi1)) {
1135                         ret = PTR_ERR(lt9611->dsi1);
1136                         goto err_remove_bridge;
1137                 }
1138         }
1139
1140         lt9611_enable_hpd_interrupts(lt9611);
1141
1142         ret = lt9611_audio_init(dev, lt9611);
1143         if (ret)
1144                 goto err_remove_bridge;
1145
1146         return 0;
1147
1148 err_remove_bridge:
1149         drm_bridge_remove(&lt9611->bridge);
1150
1151 err_disable_regulators:
1152         regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
1153
1154 err_of_put:
1155         of_node_put(lt9611->dsi1_node);
1156         of_node_put(lt9611->dsi0_node);
1157
1158         return ret;
1159 }
1160
1161 static void lt9611_remove(struct i2c_client *client)
1162 {
1163         struct lt9611 *lt9611 = i2c_get_clientdata(client);
1164
1165         disable_irq(client->irq);
1166         lt9611_audio_exit(lt9611);
1167         drm_bridge_remove(&lt9611->bridge);
1168
1169         regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
1170
1171         of_node_put(lt9611->dsi1_node);
1172         of_node_put(lt9611->dsi0_node);
1173 }
1174
1175 static struct i2c_device_id lt9611_id[] = {
1176         { "lontium,lt9611", 0 },
1177         {}
1178 };
1179 MODULE_DEVICE_TABLE(i2c, lt9611_id);
1180
1181 static const struct of_device_id lt9611_match_table[] = {
1182         { .compatible = "lontium,lt9611" },
1183         { }
1184 };
1185 MODULE_DEVICE_TABLE(of, lt9611_match_table);
1186
1187 static struct i2c_driver lt9611_driver = {
1188         .driver = {
1189                 .name = "lt9611",
1190                 .of_match_table = lt9611_match_table,
1191         },
1192         .probe = lt9611_probe,
1193         .remove = lt9611_remove,
1194         .id_table = lt9611_id,
1195 };
1196 module_i2c_driver(lt9611_driver);
1197
1198 MODULE_DESCRIPTION("Lontium LT9611 DSI/HDMI bridge driver");
1199 MODULE_LICENSE("GPL v2");