drivers/gpu/drm/bridge/sii902x.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2018 Renesas Electronics
   4  *
   5  * Copyright (C) 2016 Atmel
   6  *                    Bo Shen <[email protected]>
   7  *
   8  * Authors:           Bo Shen <[email protected]>
   9  *                    Boris Brezillon <[email protected]>
  10  *                    Wu, Songjun <[email protected]>
  11  *
  12  * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
  13  */
  14
  15 #include <linux/gpio/consumer.h>
  16 #include <linux/i2c-mux.h>
  17 #include <linux/i2c.h>
  18 #include <linux/media-bus-format.h>
  19 #include <linux/module.h>
  20 #include <linux/regmap.h>
  21 #include <linux/regulator/consumer.h>
  22 #include <linux/clk.h>
  23
  24 #include <drm/drm_atomic_helper.h>
  25 #include <drm/drm_bridge.h>
  26 #include <drm/drm_drv.h>
  27 #include <drm/drm_edid.h>
  28 #include <drm/drm_print.h>
  29 #include <drm/drm_probe_helper.h>
  30
  31 #include <sound/hdmi-codec.h>
  32
  33 #define SII902X_TPI_VIDEO_DATA                  0x0
  34
  35 #define SII902X_TPI_PIXEL_REPETITION            0x8
  36 #define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT     BIT(5)
  37 #define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE   BIT(4)
  38 #define SII902X_TPI_AVI_PIXEL_REP_4X            3
  39 #define SII902X_TPI_AVI_PIXEL_REP_2X            1
  40 #define SII902X_TPI_AVI_PIXEL_REP_NONE          0
  41 #define SII902X_TPI_CLK_RATIO_HALF              (0 << 6)
  42 #define SII902X_TPI_CLK_RATIO_1X                (1 << 6)
  43 #define SII902X_TPI_CLK_RATIO_2X                (2 << 6)
  44 #define SII902X_TPI_CLK_RATIO_4X                (3 << 6)
  45
  46 #define SII902X_TPI_AVI_IN_FORMAT               0x9
  47 #define SII902X_TPI_AVI_INPUT_BITMODE_12BIT     BIT(7)
  48 #define SII902X_TPI_AVI_INPUT_DITHER            BIT(6)
  49 #define SII902X_TPI_AVI_INPUT_RANGE_LIMITED     (2 << 2)
  50 #define SII902X_TPI_AVI_INPUT_RANGE_FULL        (1 << 2)
  51 #define SII902X_TPI_AVI_INPUT_RANGE_AUTO        (0 << 2)
  52 #define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK  (3 << 0)
  53 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
  54 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
  55 #define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB    (0 << 0)
  56
  57 #define SII902X_TPI_AVI_INFOFRAME               0x0c
  58
  59 #define SII902X_SYS_CTRL_DATA                   0x1a
  60 #define SII902X_SYS_CTRL_PWR_DWN                BIT(4)
  61 #define SII902X_SYS_CTRL_AV_MUTE                BIT(3)
  62 #define SII902X_SYS_CTRL_DDC_BUS_REQ            BIT(2)
  63 #define SII902X_SYS_CTRL_DDC_BUS_GRTD           BIT(1)
  64 #define SII902X_SYS_CTRL_OUTPUT_MODE            BIT(0)
  65 #define SII902X_SYS_CTRL_OUTPUT_HDMI            1
  66 #define SII902X_SYS_CTRL_OUTPUT_DVI             0
  67
  68 #define SII902X_REG_CHIPID(n)                   (0x1b + (n))
  69
  70 #define SII902X_PWR_STATE_CTRL                  0x1e
  71 #define SII902X_AVI_POWER_STATE_MSK             GENMASK(1, 0)
  72 #define SII902X_AVI_POWER_STATE_D(l)            ((l) & SII902X_AVI_POWER_STATE_MSK)
  73
  74 /* Audio  */
  75 #define SII902X_TPI_I2S_ENABLE_MAPPING_REG      0x1f
  76 #define SII902X_TPI_I2S_CONFIG_FIFO0                    (0 << 0)
  77 #define SII902X_TPI_I2S_CONFIG_FIFO1                    (1 << 0)
  78 #define SII902X_TPI_I2S_CONFIG_FIFO2                    (2 << 0)
  79 #define SII902X_TPI_I2S_CONFIG_FIFO3                    (3 << 0)
  80 #define SII902X_TPI_I2S_LEFT_RIGHT_SWAP                 (1 << 2)
  81 #define SII902X_TPI_I2S_AUTO_DOWNSAMPLE                 (1 << 3)
  82 #define SII902X_TPI_I2S_SELECT_SD0                      (0 << 4)
  83 #define SII902X_TPI_I2S_SELECT_SD1                      (1 << 4)
  84 #define SII902X_TPI_I2S_SELECT_SD2                      (2 << 4)
  85 #define SII902X_TPI_I2S_SELECT_SD3                      (3 << 4)
  86 #define SII902X_TPI_I2S_FIFO_ENABLE                     (1 << 7)
  87
  88 #define SII902X_TPI_I2S_INPUT_CONFIG_REG        0x20
  89 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES             (0 << 0)
  90 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_NO              (1 << 0)
  91 #define SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST          (0 << 1)
  92 #define SII902X_TPI_I2S_SD_DIRECTION_LSB_FIRST          (1 << 1)
  93 #define SII902X_TPI_I2S_SD_JUSTIFY_LEFT                 (0 << 2)
  94 #define SII902X_TPI_I2S_SD_JUSTIFY_RIGHT                (1 << 2)
  95 #define SII902X_TPI_I2S_WS_POLARITY_LOW                 (0 << 3)
  96 #define SII902X_TPI_I2S_WS_POLARITY_HIGH                (1 << 3)
  97 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_128             (0 << 4)
  98 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_256             (1 << 4)
  99 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_384             (2 << 4)
 100 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_512             (3 << 4)
 101 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_768             (4 << 4)
 102 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1024            (5 << 4)
 103 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1152            (6 << 4)
 104 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_192             (7 << 4)
 105 #define SII902X_TPI_I2S_SCK_EDGE_FALLING                (0 << 7)
 106 #define SII902X_TPI_I2S_SCK_EDGE_RISING                 (1 << 7)
 107
 108 #define SII902X_TPI_I2S_STRM_HDR_BASE   0x21
 109 #define SII902X_TPI_I2S_STRM_HDR_SIZE   5
 110
 111 #define SII902X_TPI_AUDIO_CONFIG_BYTE2_REG      0x26
 112 #define SII902X_TPI_AUDIO_CODING_STREAM_HEADER          (0 << 0)
 113 #define SII902X_TPI_AUDIO_CODING_PCM                    (1 << 0)
 114 #define SII902X_TPI_AUDIO_CODING_AC3                    (2 << 0)
 115 #define SII902X_TPI_AUDIO_CODING_MPEG1                  (3 << 0)
 116 #define SII902X_TPI_AUDIO_CODING_MP3                    (4 << 0)
 117 #define SII902X_TPI_AUDIO_CODING_MPEG2                  (5 << 0)
 118 #define SII902X_TPI_AUDIO_CODING_AAC                    (6 << 0)
 119 #define SII902X_TPI_AUDIO_CODING_DTS                    (7 << 0)
 120 #define SII902X_TPI_AUDIO_CODING_ATRAC                  (8 << 0)
 121 #define SII902X_TPI_AUDIO_MUTE_DISABLE                  (0 << 4)
 122 #define SII902X_TPI_AUDIO_MUTE_ENABLE                   (1 << 4)
 123 #define SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS             (0 << 5)
 124 #define SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS             (1 << 5)
 125 #define SII902X_TPI_AUDIO_INTERFACE_DISABLE             (0 << 6)
 126 #define SII902X_TPI_AUDIO_INTERFACE_SPDIF               (1 << 6)
 127 #define SII902X_TPI_AUDIO_INTERFACE_I2S                 (2 << 6)
 128
 129 #define SII902X_TPI_AUDIO_CONFIG_BYTE3_REG      0x27
 130 #define SII902X_TPI_AUDIO_FREQ_STREAM                   (0 << 3)
 131 #define SII902X_TPI_AUDIO_FREQ_32KHZ                    (1 << 3)
 132 #define SII902X_TPI_AUDIO_FREQ_44KHZ                    (2 << 3)
 133 #define SII902X_TPI_AUDIO_FREQ_48KHZ                    (3 << 3)
 134 #define SII902X_TPI_AUDIO_FREQ_88KHZ                    (4 << 3)
 135 #define SII902X_TPI_AUDIO_FREQ_96KHZ                    (5 << 3)
 136 #define SII902X_TPI_AUDIO_FREQ_176KHZ                   (6 << 3)
 137 #define SII902X_TPI_AUDIO_FREQ_192KHZ                   (7 << 3)
 138 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_STREAM            (0 << 6)
 139 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_16                (1 << 6)
 140 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_20                (2 << 6)
 141 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_24                (3 << 6)
 142
 143 #define SII902X_TPI_AUDIO_CONFIG_BYTE4_REG      0x28
 144
 145 #define SII902X_INT_ENABLE                      0x3c
 146 #define SII902X_INT_STATUS                      0x3d
 147 #define SII902X_HOTPLUG_EVENT                   BIT(0)
 148 #define SII902X_PLUGGED_STATUS                  BIT(2)
 149
 150 #define SII902X_REG_TPI_RQB                     0xc7
 151
 152 /* Indirect internal register access */
 153 #define SII902X_IND_SET_PAGE                    0xbc
 154 #define SII902X_IND_OFFSET                      0xbd
 155 #define SII902X_IND_VALUE                       0xbe
 156
 157 #define SII902X_TPI_MISC_INFOFRAME_BASE         0xbf
 158 #define SII902X_TPI_MISC_INFOFRAME_END          0xde
 159 #define SII902X_TPI_MISC_INFOFRAME_SIZE \
 160         (SII902X_TPI_MISC_INFOFRAME_END - SII902X_TPI_MISC_INFOFRAME_BASE)
 161
 162 #define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS  500
 163
 164 #define SII902X_AUDIO_PORT_INDEX                3
 165
 166 struct sii902x {
 167         struct i2c_client *i2c;
 168         struct regmap *regmap;
 169         struct drm_bridge bridge;
 170         struct drm_bridge *next_bridge;
 171         struct drm_connector connector;
 172         struct gpio_desc *reset_gpio;
 173         struct i2c_mux_core *i2cmux;
 174         bool sink_is_hdmi;
 175         /*
 176          * Mutex protects audio and video functions from interfering
 177          * each other, by keeping their i2c command sequences atomic.
 178          */
 179         struct mutex mutex;
 180         struct sii902x_audio {
 181                 struct platform_device *pdev;
 182                 struct clk *mclk;
 183                 u32 i2s_fifo_sequence[4];
 184         } audio;
 185 };
 186
 187 static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
 188 {
 189         union i2c_smbus_data data;
 190         int ret;
 191
 192         ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
 193                                I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data);
 194
 195         if (ret < 0)
 196                 return ret;
 197
 198         *val = data.byte;
 199         return 0;
 200 }
 201
 202 static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val)
 203 {
 204         union i2c_smbus_data data;
 205
 206         data.byte = val;
 207
 208         return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
 209                                 I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA,
 210                                 &data);
 211 }
 212
 213 static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask,
 214                                         u8 val)
 215 {
 216         int ret;
 217         u8 status;
 218
 219         ret = sii902x_read_unlocked(i2c, reg, &status);
 220         if (ret)
 221                 return ret;
 222         status &= ~mask;
 223         status |= val & mask;
 224         return sii902x_write_unlocked(i2c, reg, status);
 225 }
 226
 227 static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
 228 {
 229         return container_of(bridge, struct sii902x, bridge);
 230 }
 231
 232 static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
 233 {
 234         return container_of(con, struct sii902x, connector);
 235 }
 236
 237 static void sii902x_reset(struct sii902x *sii902x)
 238 {
 239         if (!sii902x->reset_gpio)
 240                 return;
 241
 242         gpiod_set_value_cansleep(sii902x->reset_gpio, 1);
 243
 244         /* The datasheet says treset-min = 100us. Make it 150us to be sure. */
 245         usleep_range(150, 200);
 246
 247         gpiod_set_value_cansleep(sii902x->reset_gpio, 0);
 248 }
 249
 250 static enum drm_connector_status sii902x_detect(struct sii902x *sii902x)
 251 {
 252         unsigned int status;
 253
 254         mutex_lock(&sii902x->mutex);
 255
 256         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 257
 258         mutex_unlock(&sii902x->mutex);
 259
 260         return (status & SII902X_PLUGGED_STATUS) ?
 261                connector_status_connected : connector_status_disconnected;
 262 }
 263
 264 static enum drm_connector_status
 265 sii902x_connector_detect(struct drm_connector *connector, bool force)
 266 {
 267         struct sii902x *sii902x = connector_to_sii902x(connector);
 268
 269         return sii902x_detect(sii902x);
 270 }
 271
 272 static const struct drm_connector_funcs sii902x_connector_funcs = {
 273         .detect = sii902x_connector_detect,
 274         .fill_modes = drm_helper_probe_single_connector_modes,
 275         .destroy = drm_connector_cleanup,
 276         .reset = drm_atomic_helper_connector_reset,
 277         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 278         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 279 };
 280
 281 static struct edid *sii902x_get_edid(struct sii902x *sii902x,
 282                                      struct drm_connector *connector)
 283 {
 284         struct edid *edid;
 285
 286         mutex_lock(&sii902x->mutex);
 287
 288         edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]);
 289         if (edid) {
 290                 if (drm_detect_hdmi_monitor(edid))
 291                         sii902x->sink_is_hdmi = true;
 292                 else
 293                         sii902x->sink_is_hdmi = false;
 294         }
 295
 296         mutex_unlock(&sii902x->mutex);
 297
 298         return edid;
 299 }
 300
 301 static int sii902x_get_modes(struct drm_connector *connector)
 302 {
 303         struct sii902x *sii902x = connector_to_sii902x(connector);
 304         struct edid *edid;
 305         int num = 0;
 306
 307         edid = sii902x_get_edid(sii902x, connector);
 308         drm_connector_update_edid_property(connector, edid);
 309         if (edid) {
 310                 num = drm_add_edid_modes(connector, edid);
 311                 kfree(edid);
 312         }
 313
 314         return num;
 315 }
 316
 317 static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
 318                                                struct drm_display_mode *mode)
 319 {
 320         /* TODO: check mode */
 321
 322         return MODE_OK;
 323 }
 324
 325 static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
 326         .get_modes = sii902x_get_modes,
 327         .mode_valid = sii902x_mode_valid,
 328 };
 329
 330 static void sii902x_bridge_disable(struct drm_bridge *bridge)
 331 {
 332         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 333
 334         mutex_lock(&sii902x->mutex);
 335
 336         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 337                            SII902X_SYS_CTRL_PWR_DWN,
 338                            SII902X_SYS_CTRL_PWR_DWN);
 339
 340         mutex_unlock(&sii902x->mutex);
 341 }
 342
 343 static void sii902x_bridge_enable(struct drm_bridge *bridge)
 344 {
 345         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 346
 347         mutex_lock(&sii902x->mutex);
 348
 349         regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
 350                            SII902X_AVI_POWER_STATE_MSK,
 351                            SII902X_AVI_POWER_STATE_D(0));
 352         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 353                            SII902X_SYS_CTRL_PWR_DWN, 0);
 354
 355         mutex_unlock(&sii902x->mutex);
 356 }
 357
 358 static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
 359                                     const struct drm_display_mode *mode,
 360                                     const struct drm_display_mode *adj)
 361 {
 362         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 363         u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
 364         struct regmap *regmap = sii902x->regmap;
 365         u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
 366         struct hdmi_avi_infoframe frame;
 367         u16 pixel_clock_10kHz = adj->clock / 10;
 368         int ret;
 369
 370         if (sii902x->sink_is_hdmi)
 371                 output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI;
 372
 373         buf[0] = pixel_clock_10kHz & 0xff;
 374         buf[1] = pixel_clock_10kHz >> 8;
 375         buf[2] = drm_mode_vrefresh(adj);
 376         buf[3] = 0x00;
 377         buf[4] = adj->hdisplay;
 378         buf[5] = adj->hdisplay >> 8;
 379         buf[6] = adj->vdisplay;
 380         buf[7] = adj->vdisplay >> 8;
 381         buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
 382                  SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
 383         buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
 384                  SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
 385
 386         mutex_lock(&sii902x->mutex);
 387
 388         ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 389                                  SII902X_SYS_CTRL_OUTPUT_MODE, output_mode);
 390         if (ret)
 391                 goto out;
 392
 393         ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
 394         if (ret)
 395                 goto out;
 396
 397         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
 398                                                        &sii902x->connector, adj);
 399         if (ret < 0) {
 400                 DRM_ERROR("couldn't fill AVI infoframe\n");
 401                 goto out;
 402         }
 403
 404         ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
 405         if (ret < 0) {
 406                 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
 407                 goto out;
 408         }
 409
 410         /* Do not send the infoframe header, but keep the CRC field. */
 411         regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
 412                           buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
 413                           HDMI_AVI_INFOFRAME_SIZE + 1);
 414
 415 out:
 416         mutex_unlock(&sii902x->mutex);
 417 }
 418
 419 static int sii902x_bridge_attach(struct drm_bridge *bridge,
 420                                  enum drm_bridge_attach_flags flags)
 421 {
 422         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 423         u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 424         struct drm_device *drm = bridge->dev;
 425         int ret;
 426
 427         if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
 428                 return drm_bridge_attach(bridge->encoder, sii902x->next_bridge,
 429                                          bridge, flags);
 430
 431         drm_connector_helper_add(&sii902x->connector,
 432                                  &sii902x_connector_helper_funcs);
 433
 434         if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
 435                 dev_err(&sii902x->i2c->dev,
 436                         "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
 437                 return -ENOTSUPP;
 438         }
 439
 440         ret = drm_connector_init(drm, &sii902x->connector,
 441                                  &sii902x_connector_funcs,
 442                                  DRM_MODE_CONNECTOR_HDMIA);
 443         if (ret)
 444                 return ret;
 445
 446         if (sii902x->i2c->irq > 0)
 447                 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
 448         else
 449                 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 450
 451         ret = drm_display_info_set_bus_formats(&sii902x->connector.display_info,
 452                                                &bus_format, 1);
 453         if (ret)
 454                 return ret;
 455
 456         drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);
 457
 458         return 0;
 459 }
 460
 461 static enum drm_connector_status sii902x_bridge_detect(struct drm_bridge *bridge)
 462 {
 463         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 464
 465         return sii902x_detect(sii902x);
 466 }
 467
 468 static struct edid *sii902x_bridge_get_edid(struct drm_bridge *bridge,
 469                                             struct drm_connector *connector)
 470 {
 471         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 472
 473         return sii902x_get_edid(sii902x, connector);
 474 }
 475
 476 static const struct drm_bridge_funcs sii902x_bridge_funcs = {
 477         .attach = sii902x_bridge_attach,
 478         .mode_set = sii902x_bridge_mode_set,
 479         .disable = sii902x_bridge_disable,
 480         .enable = sii902x_bridge_enable,
 481         .detect = sii902x_bridge_detect,
 482         .get_edid = sii902x_bridge_get_edid,
 483 };
 484
 485 static int sii902x_mute(struct sii902x *sii902x, bool mute)
 486 {
 487         struct device *dev = &sii902x->i2c->dev;
 488         unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :
 489                 SII902X_TPI_AUDIO_MUTE_DISABLE;
 490
 491         dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");
 492
 493         return regmap_update_bits(sii902x->regmap,
 494                                   SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 495                                   SII902X_TPI_AUDIO_MUTE_ENABLE, val);
 496 }
 497
 498 static const int sii902x_mclk_div_table[] = {
 499         128, 256, 384, 512, 768, 1024, 1152, 192 };
 500
 501 static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,
 502                                    unsigned int mclk)
 503 {
 504         int div = mclk / rate;
 505         int distance = 100000;
 506         u8 i, nearest = 0;
 507
 508         for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
 509                 unsigned int d = abs(div - sii902x_mclk_div_table[i]);
 510
 511                 if (d >= distance)
 512                         continue;
 513
 514                 nearest = i;
 515                 distance = d;
 516                 if (d == 0)
 517                         break;
 518         }
 519
 520         *i2s_config_reg |= nearest << 4;
 521
 522         return sii902x_mclk_div_table[nearest];
 523 }
 524
 525 static const struct sii902x_sample_freq {
 526         u32 freq;
 527         u8 val;
 528 } sii902x_sample_freq[] = {
 529         { .freq = 32000,        .val = SII902X_TPI_AUDIO_FREQ_32KHZ },
 530         { .freq = 44000,        .val = SII902X_TPI_AUDIO_FREQ_44KHZ },
 531         { .freq = 48000,        .val = SII902X_TPI_AUDIO_FREQ_48KHZ },
 532         { .freq = 88000,        .val = SII902X_TPI_AUDIO_FREQ_88KHZ },
 533         { .freq = 96000,        .val = SII902X_TPI_AUDIO_FREQ_96KHZ },
 534         { .freq = 176000,       .val = SII902X_TPI_AUDIO_FREQ_176KHZ },
 535         { .freq = 192000,       .val = SII902X_TPI_AUDIO_FREQ_192KHZ },
 536 };
 537
 538 static int sii902x_audio_hw_params(struct device *dev, void *data,
 539                                    struct hdmi_codec_daifmt *daifmt,
 540                                    struct hdmi_codec_params *params)
 541 {
 542         struct sii902x *sii902x = dev_get_drvdata(dev);
 543         u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;
 544         u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |
 545                                SII902X_TPI_AUDIO_MUTE_ENABLE |
 546                                SII902X_TPI_AUDIO_CODING_PCM);
 547         u8 config_byte3_reg = 0;
 548         u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];
 549         unsigned long mclk_rate;
 550         int i, ret;
 551
 552         if (daifmt->bit_clk_provider || daifmt->frame_clk_provider) {
 553                 dev_dbg(dev, "%s: I2S clock provider mode not supported\n",
 554                         __func__);
 555                 return -EINVAL;
 556         }
 557
 558         switch (daifmt->fmt) {
 559         case HDMI_I2S:
 560                 i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |
 561                         SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
 562                 break;
 563         case HDMI_RIGHT_J:
 564                 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;
 565                 break;
 566         case HDMI_LEFT_J:
 567                 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
 568                 break;
 569         default:
 570                 dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,
 571                         daifmt->fmt);
 572                 return -EINVAL;
 573         }
 574
 575         if (daifmt->bit_clk_inv)
 576                 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;
 577         else
 578                 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;
 579
 580         if (daifmt->frame_clk_inv)
 581                 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;
 582         else
 583                 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;
 584
 585         if (params->channels > 2)
 586                 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;
 587         else
 588                 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;
 589
 590         switch (params->sample_width) {
 591         case 16:
 592                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;
 593                 break;
 594         case 20:
 595                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;
 596                 break;
 597         case 24:
 598         case 32:
 599                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;
 600                 break;
 601         default:
 602                 dev_err(dev, "%s: Unsupported sample width %u\n", __func__,
 603                         params->sample_width);
 604                 return -EINVAL;
 605         }
 606
 607         for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {
 608                 if (params->sample_rate == sii902x_sample_freq[i].freq) {
 609                         config_byte3_reg |= sii902x_sample_freq[i].val;
 610                         break;
 611                 }
 612         }
 613
 614         ret = clk_prepare_enable(sii902x->audio.mclk);
 615         if (ret) {
 616                 dev_err(dev, "Enabling mclk failed: %d\n", ret);
 617                 return ret;
 618         }
 619
 620         if (sii902x->audio.mclk) {
 621                 mclk_rate = clk_get_rate(sii902x->audio.mclk);
 622                 ret = sii902x_select_mclk_div(&i2s_config_reg,
 623                                               params->sample_rate, mclk_rate);
 624                 if (mclk_rate != ret * params->sample_rate)
 625                         dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
 626                                 mclk_rate, ret, params->sample_rate);
 627         }
 628
 629         mutex_lock(&sii902x->mutex);
 630
 631         ret = regmap_write(sii902x->regmap,
 632                            SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 633                            config_byte2_reg);
 634         if (ret < 0)
 635                 goto out;
 636
 637         ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,
 638                            i2s_config_reg);
 639         if (ret)
 640                 goto out;
 641
 642         for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) &&
 643                     sii902x->audio.i2s_fifo_sequence[i]; i++)
 644                 regmap_write(sii902x->regmap,
 645                              SII902X_TPI_I2S_ENABLE_MAPPING_REG,
 646                              sii902x->audio.i2s_fifo_sequence[i]);
 647
 648         ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,
 649                            config_byte3_reg);
 650         if (ret)
 651                 goto out;
 652
 653         ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,
 654                                 params->iec.status,
 655                                 min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,
 656                                     sizeof(params->iec.status)));
 657         if (ret)
 658                 goto out;
 659
 660         ret = hdmi_audio_infoframe_pack(&params->cea, infoframe_buf,
 661                                         sizeof(infoframe_buf));
 662         if (ret < 0) {
 663                 dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",
 664                         __func__, ret);
 665                 goto out;
 666         }
 667
 668         ret = regmap_bulk_write(sii902x->regmap,
 669                                 SII902X_TPI_MISC_INFOFRAME_BASE,
 670                                 infoframe_buf,
 671                                 min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));
 672         if (ret)
 673                 goto out;
 674
 675         /* Decode Level 0 Packets */
 676         ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02);
 677         if (ret)
 678                 goto out;
 679
 680         ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24);
 681         if (ret)
 682                 goto out;
 683
 684         ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02);
 685         if (ret)
 686                 goto out;
 687
 688         dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);
 689 out:
 690         mutex_unlock(&sii902x->mutex);
 691
 692         if (ret) {
 693                 clk_disable_unprepare(sii902x->audio.mclk);
 694                 dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
 695                         ret);
 696         }
 697
 698         return ret;
 699 }
 700
 701 static void sii902x_audio_shutdown(struct device *dev, void *data)
 702 {
 703         struct sii902x *sii902x = dev_get_drvdata(dev);
 704
 705         mutex_lock(&sii902x->mutex);
 706
 707         regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 708                      SII902X_TPI_AUDIO_INTERFACE_DISABLE);
 709
 710         mutex_unlock(&sii902x->mutex);
 711
 712         clk_disable_unprepare(sii902x->audio.mclk);
 713 }
 714
 715 static int sii902x_audio_mute(struct device *dev, void *data,
 716                               bool enable, int direction)
 717 {
 718         struct sii902x *sii902x = dev_get_drvdata(dev);
 719
 720         mutex_lock(&sii902x->mutex);
 721
 722         sii902x_mute(sii902x, enable);
 723
 724         mutex_unlock(&sii902x->mutex);
 725
 726         return 0;
 727 }
 728
 729 static int sii902x_audio_get_eld(struct device *dev, void *data,
 730                                  uint8_t *buf, size_t len)
 731 {
 732         struct sii902x *sii902x = dev_get_drvdata(dev);
 733
 734         mutex_lock(&sii902x->mutex);
 735
 736         memcpy(buf, sii902x->connector.eld,
 737                min(sizeof(sii902x->connector.eld), len));
 738
 739         mutex_unlock(&sii902x->mutex);
 740
 741         return 0;
 742 }
 743
 744 static int sii902x_audio_get_dai_id(struct snd_soc_component *component,
 745                                     struct device_node *endpoint)
 746 {
 747         struct of_endpoint of_ep;
 748         int ret;
 749
 750         ret = of_graph_parse_endpoint(endpoint, &of_ep);
 751         if (ret < 0)
 752                 return ret;
 753
 754         /*
 755          * HDMI sound should be located at reg = <3>
 756          * Return expected DAI index 0.
 757          */
 758         if (of_ep.port == SII902X_AUDIO_PORT_INDEX)
 759                 return 0;
 760
 761         return -EINVAL;
 762 }
 763
 764 static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
 765         .hw_params = sii902x_audio_hw_params,
 766         .audio_shutdown = sii902x_audio_shutdown,
 767         .mute_stream = sii902x_audio_mute,
 768         .get_eld = sii902x_audio_get_eld,
 769         .get_dai_id = sii902x_audio_get_dai_id,
 770         .no_capture_mute = 1,
 771 };
 772
 773 static int sii902x_audio_codec_init(struct sii902x *sii902x,
 774                                     struct device *dev)
 775 {
 776         static const u8 audio_fifo_id[] = {
 777                 SII902X_TPI_I2S_CONFIG_FIFO0,
 778                 SII902X_TPI_I2S_CONFIG_FIFO1,
 779                 SII902X_TPI_I2S_CONFIG_FIFO2,
 780                 SII902X_TPI_I2S_CONFIG_FIFO3,
 781         };
 782         static const u8 i2s_lane_id[] = {
 783                 SII902X_TPI_I2S_SELECT_SD0,
 784                 SII902X_TPI_I2S_SELECT_SD1,
 785                 SII902X_TPI_I2S_SELECT_SD2,
 786                 SII902X_TPI_I2S_SELECT_SD3,
 787         };
 788         struct hdmi_codec_pdata codec_data = {
 789                 .ops = &sii902x_audio_codec_ops,
 790                 .i2s = 1, /* Only i2s support for now. */
 791                 .spdif = 0,
 792                 .max_i2s_channels = 0,
 793         };
 794         u8 lanes[4];
 795         int num_lanes, i;
 796
 797         if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) {
 798                 dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n",
 799                         __func__);
 800                 return 0;
 801         }
 802
 803         num_lanes = of_property_read_variable_u8_array(dev->of_node,
 804                                                        "sil,i2s-data-lanes",
 805                                                        lanes, 1,
 806                                                        ARRAY_SIZE(lanes));
 807
 808         if (num_lanes == -EINVAL) {
 809                 dev_dbg(dev,
 810                         "%s: No \"sil,i2s-data-lanes\", use default <0>\n",
 811                         __func__);
 812                 num_lanes = 1;
 813                 lanes[0] = 0;
 814         } else if (num_lanes < 0) {
 815                 dev_err(dev,
 816                         "%s: Error gettin \"sil,i2s-data-lanes\": %d\n",
 817                         __func__, num_lanes);
 818                 return num_lanes;
 819         }
 820         codec_data.max_i2s_channels = 2 * num_lanes;
 821
 822         for (i = 0; i < num_lanes; i++)
 823                 sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |
 824                         i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE;
 825
 826         sii902x->audio.mclk = devm_clk_get_optional(dev, "mclk");
 827         if (IS_ERR(sii902x->audio.mclk)) {
 828                 dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
 829                         __func__, PTR_ERR(sii902x->audio.mclk));
 830                 return PTR_ERR(sii902x->audio.mclk);
 831         }
 832
 833         sii902x->audio.pdev = platform_device_register_data(
 834                 dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
 835                 &codec_data, sizeof(codec_data));
 836
 837         return PTR_ERR_OR_ZERO(sii902x->audio.pdev);
 838 }
 839
 840 static const struct regmap_range sii902x_volatile_ranges[] = {
 841         { .range_min = 0, .range_max = 0xff },
 842 };
 843
 844 static const struct regmap_access_table sii902x_volatile_table = {
 845         .yes_ranges = sii902x_volatile_ranges,
 846         .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
 847 };
 848
 849 static const struct regmap_config sii902x_regmap_config = {
 850         .reg_bits = 8,
 851         .val_bits = 8,
 852         .disable_locking = true, /* struct sii902x mutex should be enough */
 853         .max_register = SII902X_TPI_MISC_INFOFRAME_END,
 854         .volatile_table = &sii902x_volatile_table,
 855         .cache_type = REGCACHE_NONE,
 856 };
 857
 858 static irqreturn_t sii902x_interrupt(int irq, void *data)
 859 {
 860         struct sii902x *sii902x = data;
 861         unsigned int status = 0;
 862
 863         mutex_lock(&sii902x->mutex);
 864
 865         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 866         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
 867
 868         mutex_unlock(&sii902x->mutex);
 869
 870         if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev) {
 871                 drm_helper_hpd_irq_event(sii902x->bridge.dev);
 872                 drm_bridge_hpd_notify(&sii902x->bridge, (status & SII902X_PLUGGED_STATUS)
 873                                                                 ? connector_status_connected
 874                                                                 : connector_status_disconnected);
 875         }
 876
 877         return IRQ_HANDLED;
 878 }
 879
 880 /*
 881  * The purpose of sii902x_i2c_bypass_select is to enable the pass through
 882  * mode of the HDMI transmitter. Do not use regmap from within this function,
 883  * only use sii902x_*_unlocked functions to read/modify/write registers.
 884  * We are holding the parent adapter lock here, keep this in mind before
 885  * adding more i2c transactions.
 886  *
 887  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
 888  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
 889  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
 890  * we leave the remaining bits as we have found them.
 891  */
 892 static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
 893 {
 894         struct sii902x *sii902x = i2c_mux_priv(mux);
 895         struct device *dev = &sii902x->i2c->dev;
 896         unsigned long timeout;
 897         u8 status;
 898         int ret;
 899
 900         ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 901                                            SII902X_SYS_CTRL_DDC_BUS_REQ,
 902                                            SII902X_SYS_CTRL_DDC_BUS_REQ);
 903         if (ret)
 904                 return ret;
 905
 906         timeout = jiffies +
 907                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 908         do {
 909                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 910                                             &status);
 911                 if (ret)
 912                         return ret;
 913         } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 914                  time_before(jiffies, timeout));
 915
 916         if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 917                 dev_err(dev, "Failed to acquire the i2c bus\n");
 918                 return -ETIMEDOUT;
 919         }
 920
 921         return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 922                                       status);
 923 }
 924
 925 /*
 926  * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through
 927  * mode of the HDMI transmitter. Do not use regmap from within this function,
 928  * only use sii902x_*_unlocked functions to read/modify/write registers.
 929  * We are holding the parent adapter lock here, keep this in mind before
 930  * adding more i2c transactions.
 931  *
 932  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
 933  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
 934  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
 935  * we leave the remaining bits as we have found them.
 936  */
 937 static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
 938 {
 939         struct sii902x *sii902x = i2c_mux_priv(mux);
 940         struct device *dev = &sii902x->i2c->dev;
 941         unsigned long timeout;
 942         unsigned int retries;
 943         u8 status;
 944         int ret;
 945
 946         /*
 947          * When the HDMI transmitter is in pass through mode, we need an
 948          * (undocumented) additional delay between STOP and START conditions
 949          * to guarantee the bus won't get stuck.
 950          */
 951         udelay(30);
 952
 953         /*
 954          * Sometimes the I2C bus can stall after failure to use the
 955          * EDID channel. Retry a few times to see if things clear
 956          * up, else continue anyway.
 957          */
 958         retries = 5;
 959         do {
 960                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 961                                             &status);
 962                 retries--;
 963         } while (ret && retries);
 964         if (ret) {
 965                 dev_err(dev, "failed to read status (%d)\n", ret);
 966                 return ret;
 967         }
 968
 969         ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 970                                            SII902X_SYS_CTRL_DDC_BUS_REQ |
 971                                            SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
 972         if (ret)
 973                 return ret;
 974
 975         timeout = jiffies +
 976                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 977         do {
 978                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 979                                             &status);
 980                 if (ret)
 981                         return ret;
 982         } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
 983                            SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 984                  time_before(jiffies, timeout));
 985
 986         if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
 987                       SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 988                 dev_err(dev, "failed to release the i2c bus\n");
 989                 return -ETIMEDOUT;
 990         }
 991
 992         return 0;
 993 }
 994
 995 static const struct drm_bridge_timings default_sii902x_timings = {
 996         .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
 997                  | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
 998                  | DRM_BUS_FLAG_DE_HIGH,
 999 };
1000
1001 static int sii902x_init(struct sii902x *sii902x)
1002 {
1003         struct device *dev = &sii902x->i2c->dev;
1004         unsigned int status = 0;
1005         u8 chipid[4];
1006         int ret;
1007
1008         sii902x_reset(sii902x);
1009
1010         ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
1011         if (ret)
1012                 return ret;
1013
1014         ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
1015                                &chipid, 4);
1016         if (ret) {
1017                 dev_err(dev, "regmap_read failed %d\n", ret);
1018                 return ret;
1019         }
1020
1021         if (chipid[0] != 0xb0) {
1022                 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
1023                         chipid[0]);
1024                 return -EINVAL;
1025         }
1026
1027         /* Clear all pending interrupts */
1028         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
1029         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
1030
1031         if (sii902x->i2c->irq > 0) {
1032                 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
1033                              SII902X_HOTPLUG_EVENT);
1034
1035                 ret = devm_request_threaded_irq(dev, sii902x->i2c->irq, NULL,
1036                                                 sii902x_interrupt,
1037                                                 IRQF_ONESHOT, dev_name(dev),
1038                                                 sii902x);
1039                 if (ret)
1040                         return ret;
1041         }
1042
1043         sii902x->bridge.funcs = &sii902x_bridge_funcs;
1044         sii902x->bridge.of_node = dev->of_node;
1045         sii902x->bridge.timings = &default_sii902x_timings;
1046         sii902x->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
1047
1048         if (sii902x->i2c->irq > 0)
1049                 sii902x->bridge.ops |= DRM_BRIDGE_OP_HPD;
1050
1051         drm_bridge_add(&sii902x->bridge);
1052
1053         sii902x_audio_codec_init(sii902x, dev);
1054
1055         i2c_set_clientdata(sii902x->i2c, sii902x);
1056
1057         sii902x->i2cmux = i2c_mux_alloc(sii902x->i2c->adapter, dev,
1058                                         1, 0, I2C_MUX_GATE,
1059                                         sii902x_i2c_bypass_select,
1060                                         sii902x_i2c_bypass_deselect);
1061         if (!sii902x->i2cmux)
1062                 return -ENOMEM;
1063
1064         sii902x->i2cmux->priv = sii902x;
1065         return i2c_mux_add_adapter(sii902x->i2cmux, 0, 0, 0);
1066 }
1067
1068 static int sii902x_probe(struct i2c_client *client)
1069 {
1070         struct device *dev = &client->dev;
1071         struct device_node *endpoint;
1072         struct sii902x *sii902x;
1073         static const char * const supplies[] = {"iovcc", "cvcc12"};
1074         int ret;
1075
1076         ret = i2c_check_functionality(client->adapter,
1077                                       I2C_FUNC_SMBUS_BYTE_DATA);
1078         if (!ret) {
1079                 dev_err(dev, "I2C adapter not suitable\n");
1080                 return -EIO;
1081         }
1082
1083         sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
1084         if (!sii902x)
1085                 return -ENOMEM;
1086
1087         sii902x->i2c = client;
1088         sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
1089         if (IS_ERR(sii902x->regmap))
1090                 return PTR_ERR(sii902x->regmap);
1091
1092         sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
1093                                                       GPIOD_OUT_LOW);
1094         if (IS_ERR(sii902x->reset_gpio)) {
1095                 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
1096                         PTR_ERR(sii902x->reset_gpio));
1097                 return PTR_ERR(sii902x->reset_gpio);
1098         }
1099
1100         endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
1101         if (endpoint) {
1102                 struct device_node *remote = of_graph_get_remote_port_parent(endpoint);
1103
1104                 of_node_put(endpoint);
1105                 if (!remote) {
1106                         dev_err(dev, "Endpoint in port@1 unconnected\n");
1107                         return -ENODEV;
1108                 }
1109
1110                 if (!of_device_is_available(remote)) {
1111                         dev_err(dev, "port@1 remote device is disabled\n");
1112                         of_node_put(remote);
1113                         return -ENODEV;
1114                 }
1115
1116                 sii902x->next_bridge = of_drm_find_bridge(remote);
1117                 of_node_put(remote);
1118                 if (!sii902x->next_bridge)
1119                         return dev_err_probe(dev, -EPROBE_DEFER,
1120                                              "Failed to find remote bridge\n");
1121         }
1122
1123         mutex_init(&sii902x->mutex);
1124
1125         ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(supplies), supplies);
1126         if (ret < 0)
1127                 return dev_err_probe(dev, ret, "Failed to enable supplies");
1128
1129         return sii902x_init(sii902x);
1130 }
1131
1132 static void sii902x_remove(struct i2c_client *client)
1133
1134 {
1135         struct sii902x *sii902x = i2c_get_clientdata(client);
1136
1137         i2c_mux_del_adapters(sii902x->i2cmux);
1138         drm_bridge_remove(&sii902x->bridge);
1139 }
1140
1141 static const struct of_device_id sii902x_dt_ids[] = {
1142         { .compatible = "sil,sii9022", },
1143         { }
1144 };
1145 MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
1146
1147 static const struct i2c_device_id sii902x_i2c_ids[] = {
1148         { "sii9022", 0 },
1149         { },
1150 };
1151 MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
1152
1153 static struct i2c_driver sii902x_driver = {
1154         .probe_new = sii902x_probe,
1155         .remove = sii902x_remove,
1156         .driver = {
1157                 .name = "sii902x",
1158                 .of_match_table = sii902x_dt_ids,
1159         },
1160         .id_table = sii902x_i2c_ids,
1161 };
1162 module_i2c_driver(sii902x_driver);
1163
1164 MODULE_AUTHOR("Boris Brezillon <[email protected]>");
1165 MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
1166 MODULE_LICENSE("GPL");