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 /*
 167  * The maximum resolution supported by the HDMI bridge is 1080p@60Hz
 168  * and 1920x1200 requiring a pixel clock of 165MHz and the minimum
 169  * resolution supported is 480p@60Hz requiring a pixel clock of 25MHz
 170  */
 171 #define SII902X_MIN_PIXEL_CLOCK_KHZ             25000
 172 #define SII902X_MAX_PIXEL_CLOCK_KHZ             165000
 173
 174 struct sii902x {
 175         struct i2c_client *i2c;
 176         struct regmap *regmap;
 177         struct drm_bridge bridge;
 178         struct drm_bridge *next_bridge;
 179         struct drm_connector connector;
 180         struct gpio_desc *reset_gpio;
 181         struct i2c_mux_core *i2cmux;
 182         bool sink_is_hdmi;
 183         /*
 184          * Mutex protects audio and video functions from interfering
 185          * each other, by keeping their i2c command sequences atomic.
 186          */
 187         struct mutex mutex;
 188         struct sii902x_audio {
 189                 struct platform_device *pdev;
 190                 struct clk *mclk;
 191                 u32 i2s_fifo_sequence[4];
 192         } audio;
 193 };
 194
 195 static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
 196 {
 197         union i2c_smbus_data data;
 198         int ret;
 199
 200         ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
 201                                I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data);
 202
 203         if (ret < 0)
 204                 return ret;
 205
 206         *val = data.byte;
 207         return 0;
 208 }
 209
 210 static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val)
 211 {
 212         union i2c_smbus_data data;
 213
 214         data.byte = val;
 215
 216         return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
 217                                 I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA,
 218                                 &data);
 219 }
 220
 221 static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask,
 222                                         u8 val)
 223 {
 224         int ret;
 225         u8 status;
 226
 227         ret = sii902x_read_unlocked(i2c, reg, &status);
 228         if (ret)
 229                 return ret;
 230         status &= ~mask;
 231         status |= val & mask;
 232         return sii902x_write_unlocked(i2c, reg, status);
 233 }
 234
 235 static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
 236 {
 237         return container_of(bridge, struct sii902x, bridge);
 238 }
 239
 240 static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
 241 {
 242         return container_of(con, struct sii902x, connector);
 243 }
 244
 245 static void sii902x_reset(struct sii902x *sii902x)
 246 {
 247         if (!sii902x->reset_gpio)
 248                 return;
 249
 250         gpiod_set_value_cansleep(sii902x->reset_gpio, 1);
 251
 252         /* The datasheet says treset-min = 100us. Make it 150us to be sure. */
 253         usleep_range(150, 200);
 254
 255         gpiod_set_value_cansleep(sii902x->reset_gpio, 0);
 256 }
 257
 258 static enum drm_connector_status sii902x_detect(struct sii902x *sii902x)
 259 {
 260         unsigned int status;
 261
 262         mutex_lock(&sii902x->mutex);
 263
 264         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 265
 266         mutex_unlock(&sii902x->mutex);
 267
 268         return (status & SII902X_PLUGGED_STATUS) ?
 269                connector_status_connected : connector_status_disconnected;
 270 }
 271
 272 static enum drm_connector_status
 273 sii902x_connector_detect(struct drm_connector *connector, bool force)
 274 {
 275         struct sii902x *sii902x = connector_to_sii902x(connector);
 276
 277         return sii902x_detect(sii902x);
 278 }
 279
 280 static const struct drm_connector_funcs sii902x_connector_funcs = {
 281         .detect = sii902x_connector_detect,
 282         .fill_modes = drm_helper_probe_single_connector_modes,
 283         .destroy = drm_connector_cleanup,
 284         .reset = drm_atomic_helper_connector_reset,
 285         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 286         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 287 };
 288
 289 static const struct drm_edid *sii902x_edid_read(struct sii902x *sii902x,
 290                                                 struct drm_connector *connector)
 291 {
 292         const struct drm_edid *drm_edid;
 293
 294         mutex_lock(&sii902x->mutex);
 295
 296         drm_edid = drm_edid_read_ddc(connector, sii902x->i2cmux->adapter[0]);
 297
 298         mutex_unlock(&sii902x->mutex);
 299
 300         return drm_edid;
 301 }
 302
 303 static int sii902x_get_modes(struct drm_connector *connector)
 304 {
 305         struct sii902x *sii902x = connector_to_sii902x(connector);
 306         const struct drm_edid *drm_edid;
 307         int num = 0;
 308
 309         drm_edid = sii902x_edid_read(sii902x, connector);
 310         drm_edid_connector_update(connector, drm_edid);
 311         if (drm_edid) {
 312                 num = drm_edid_connector_add_modes(connector);
 313                 drm_edid_free(drm_edid);
 314         }
 315
 316         sii902x->sink_is_hdmi = connector->display_info.is_hdmi;
 317
 318         return num;
 319 }
 320
 321 static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
 322         .get_modes = sii902x_get_modes,
 323 };
 324
 325 static void sii902x_bridge_atomic_disable(struct drm_bridge *bridge,
 326                                           struct drm_bridge_state *old_bridge_state)
 327 {
 328         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 329
 330         mutex_lock(&sii902x->mutex);
 331
 332         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 333                            SII902X_SYS_CTRL_PWR_DWN,
 334                            SII902X_SYS_CTRL_PWR_DWN);
 335
 336         mutex_unlock(&sii902x->mutex);
 337 }
 338
 339 static void sii902x_bridge_atomic_enable(struct drm_bridge *bridge,
 340                                          struct drm_bridge_state *old_bridge_state)
 341 {
 342         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 343
 344         mutex_lock(&sii902x->mutex);
 345
 346         regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
 347                            SII902X_AVI_POWER_STATE_MSK,
 348                            SII902X_AVI_POWER_STATE_D(0));
 349         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 350                            SII902X_SYS_CTRL_PWR_DWN, 0);
 351
 352         mutex_unlock(&sii902x->mutex);
 353 }
 354
 355 static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
 356                                     const struct drm_display_mode *mode,
 357                                     const struct drm_display_mode *adj)
 358 {
 359         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 360         u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
 361         struct regmap *regmap = sii902x->regmap;
 362         u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
 363         struct hdmi_avi_infoframe frame;
 364         u16 pixel_clock_10kHz = adj->clock / 10;
 365         int ret;
 366
 367         if (sii902x->sink_is_hdmi)
 368                 output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI;
 369
 370         buf[0] = pixel_clock_10kHz & 0xff;
 371         buf[1] = pixel_clock_10kHz >> 8;
 372         buf[2] = drm_mode_vrefresh(adj);
 373         buf[3] = 0x00;
 374         buf[4] = adj->hdisplay;
 375         buf[5] = adj->hdisplay >> 8;
 376         buf[6] = adj->vdisplay;
 377         buf[7] = adj->vdisplay >> 8;
 378         buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
 379                  SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
 380         buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
 381                  SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
 382
 383         mutex_lock(&sii902x->mutex);
 384
 385         ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 386                                  SII902X_SYS_CTRL_OUTPUT_MODE, output_mode);
 387         if (ret)
 388                 goto out;
 389
 390         ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
 391         if (ret)
 392                 goto out;
 393
 394         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
 395                                                        &sii902x->connector, adj);
 396         if (ret < 0) {
 397                 DRM_ERROR("couldn't fill AVI infoframe\n");
 398                 goto out;
 399         }
 400
 401         ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
 402         if (ret < 0) {
 403                 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
 404                 goto out;
 405         }
 406
 407         /* Do not send the infoframe header, but keep the CRC field. */
 408         regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
 409                           buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
 410                           HDMI_AVI_INFOFRAME_SIZE + 1);
 411
 412 out:
 413         mutex_unlock(&sii902x->mutex);
 414 }
 415
 416 static int sii902x_bridge_attach(struct drm_bridge *bridge,
 417                                  enum drm_bridge_attach_flags flags)
 418 {
 419         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 420         u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 421         struct drm_device *drm = bridge->dev;
 422         int ret;
 423
 424         if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
 425                 return drm_bridge_attach(bridge->encoder, sii902x->next_bridge,
 426                                          bridge, flags);
 427
 428         drm_connector_helper_add(&sii902x->connector,
 429                                  &sii902x_connector_helper_funcs);
 430
 431         if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
 432                 dev_err(&sii902x->i2c->dev,
 433                         "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
 434                 return -ENOTSUPP;
 435         }
 436
 437         ret = drm_connector_init(drm, &sii902x->connector,
 438                                  &sii902x_connector_funcs,
 439                                  DRM_MODE_CONNECTOR_HDMIA);
 440         if (ret)
 441                 return ret;
 442
 443         if (sii902x->i2c->irq > 0)
 444                 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
 445         else
 446                 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 447
 448         ret = drm_display_info_set_bus_formats(&sii902x->connector.display_info,
 449                                                &bus_format, 1);
 450         if (ret)
 451                 return ret;
 452
 453         drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);
 454
 455         return 0;
 456 }
 457
 458 static enum drm_connector_status sii902x_bridge_detect(struct drm_bridge *bridge)
 459 {
 460         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 461
 462         return sii902x_detect(sii902x);
 463 }
 464
 465 static const struct drm_edid *sii902x_bridge_edid_read(struct drm_bridge *bridge,
 466                                                        struct drm_connector *connector)
 467 {
 468         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 469
 470         return sii902x_edid_read(sii902x, connector);
 471 }
 472
 473 static u32 *sii902x_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
 474                                                      struct drm_bridge_state *bridge_state,
 475                                                      struct drm_crtc_state *crtc_state,
 476                                                      struct drm_connector_state *conn_state,
 477                                                      u32 output_fmt,
 478                                                      unsigned int *num_input_fmts)
 479 {
 480         u32 *input_fmts;
 481
 482         *num_input_fmts = 0;
 483
 484         input_fmts = kcalloc(1, sizeof(*input_fmts), GFP_KERNEL);
 485         if (!input_fmts)
 486                 return NULL;
 487
 488         input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
 489         *num_input_fmts = 1;
 490
 491         return input_fmts;
 492 }
 493
 494 static int sii902x_bridge_atomic_check(struct drm_bridge *bridge,
 495                                        struct drm_bridge_state *bridge_state,
 496                                        struct drm_crtc_state *crtc_state,
 497                                        struct drm_connector_state *conn_state)
 498 {
 499         if (crtc_state->mode.clock < SII902X_MIN_PIXEL_CLOCK_KHZ ||
 500             crtc_state->mode.clock > SII902X_MAX_PIXEL_CLOCK_KHZ)
 501                 return -EINVAL;
 502
 503         /*
 504          * There might be flags negotiation supported in future but
 505          * set the bus flags in atomic_check statically for now.
 506          */
 507         bridge_state->input_bus_cfg.flags = bridge->timings->input_bus_flags;
 508
 509         return 0;
 510 }
 511
 512 static enum drm_mode_status
 513 sii902x_bridge_mode_valid(struct drm_bridge *bridge,
 514                           const struct drm_display_info *info,
 515                           const struct drm_display_mode *mode)
 516 {
 517         if (mode->clock < SII902X_MIN_PIXEL_CLOCK_KHZ)
 518                 return MODE_CLOCK_LOW;
 519
 520         if (mode->clock > SII902X_MAX_PIXEL_CLOCK_KHZ)
 521                 return MODE_CLOCK_HIGH;
 522
 523         return MODE_OK;
 524 }
 525
 526 static const struct drm_bridge_funcs sii902x_bridge_funcs = {
 527         .attach = sii902x_bridge_attach,
 528         .mode_set = sii902x_bridge_mode_set,
 529         .atomic_disable = sii902x_bridge_atomic_disable,
 530         .atomic_enable = sii902x_bridge_atomic_enable,
 531         .detect = sii902x_bridge_detect,
 532         .edid_read = sii902x_bridge_edid_read,
 533         .atomic_reset = drm_atomic_helper_bridge_reset,
 534         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 535         .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 536         .atomic_get_input_bus_fmts = sii902x_bridge_atomic_get_input_bus_fmts,
 537         .atomic_check = sii902x_bridge_atomic_check,
 538         .mode_valid = sii902x_bridge_mode_valid,
 539 };
 540
 541 static int sii902x_mute(struct sii902x *sii902x, bool mute)
 542 {
 543         struct device *dev = &sii902x->i2c->dev;
 544         unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :
 545                 SII902X_TPI_AUDIO_MUTE_DISABLE;
 546
 547         dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");
 548
 549         return regmap_update_bits(sii902x->regmap,
 550                                   SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 551                                   SII902X_TPI_AUDIO_MUTE_ENABLE, val);
 552 }
 553
 554 static const int sii902x_mclk_div_table[] = {
 555         128, 256, 384, 512, 768, 1024, 1152, 192 };
 556
 557 static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,
 558                                    unsigned int mclk)
 559 {
 560         int div = mclk / rate;
 561         int distance = 100000;
 562         u8 i, nearest = 0;
 563
 564         for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
 565                 unsigned int d = abs(div - sii902x_mclk_div_table[i]);
 566
 567                 if (d >= distance)
 568                         continue;
 569
 570                 nearest = i;
 571                 distance = d;
 572                 if (d == 0)
 573                         break;
 574         }
 575
 576         *i2s_config_reg |= nearest << 4;
 577
 578         return sii902x_mclk_div_table[nearest];
 579 }
 580
 581 static const struct sii902x_sample_freq {
 582         u32 freq;
 583         u8 val;
 584 } sii902x_sample_freq[] = {
 585         { .freq = 32000,        .val = SII902X_TPI_AUDIO_FREQ_32KHZ },
 586         { .freq = 44000,        .val = SII902X_TPI_AUDIO_FREQ_44KHZ },
 587         { .freq = 48000,        .val = SII902X_TPI_AUDIO_FREQ_48KHZ },
 588         { .freq = 88000,        .val = SII902X_TPI_AUDIO_FREQ_88KHZ },
 589         { .freq = 96000,        .val = SII902X_TPI_AUDIO_FREQ_96KHZ },
 590         { .freq = 176000,       .val = SII902X_TPI_AUDIO_FREQ_176KHZ },
 591         { .freq = 192000,       .val = SII902X_TPI_AUDIO_FREQ_192KHZ },
 592 };
 593
 594 static int sii902x_audio_hw_params(struct device *dev, void *data,
 595                                    struct hdmi_codec_daifmt *daifmt,
 596                                    struct hdmi_codec_params *params)
 597 {
 598         struct sii902x *sii902x = dev_get_drvdata(dev);
 599         u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;
 600         u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |
 601                                SII902X_TPI_AUDIO_MUTE_ENABLE |
 602                                SII902X_TPI_AUDIO_CODING_PCM);
 603         u8 config_byte3_reg = 0;
 604         u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];
 605         unsigned long mclk_rate;
 606         int i, ret;
 607
 608         if (daifmt->bit_clk_provider || daifmt->frame_clk_provider) {
 609                 dev_dbg(dev, "%s: I2S clock provider mode not supported\n",
 610                         __func__);
 611                 return -EINVAL;
 612         }
 613
 614         switch (daifmt->fmt) {
 615         case HDMI_I2S:
 616                 i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |
 617                         SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
 618                 break;
 619         case HDMI_RIGHT_J:
 620                 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;
 621                 break;
 622         case HDMI_LEFT_J:
 623                 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
 624                 break;
 625         default:
 626                 dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,
 627                         daifmt->fmt);
 628                 return -EINVAL;
 629         }
 630
 631         if (daifmt->bit_clk_inv)
 632                 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;
 633         else
 634                 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;
 635
 636         if (daifmt->frame_clk_inv)
 637                 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;
 638         else
 639                 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;
 640
 641         if (params->channels > 2)
 642                 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;
 643         else
 644                 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;
 645
 646         switch (params->sample_width) {
 647         case 16:
 648                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;
 649                 break;
 650         case 20:
 651                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;
 652                 break;
 653         case 24:
 654         case 32:
 655                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;
 656                 break;
 657         default:
 658                 dev_err(dev, "%s: Unsupported sample width %u\n", __func__,
 659                         params->sample_width);
 660                 return -EINVAL;
 661         }
 662
 663         for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {
 664                 if (params->sample_rate == sii902x_sample_freq[i].freq) {
 665                         config_byte3_reg |= sii902x_sample_freq[i].val;
 666                         break;
 667                 }
 668         }
 669
 670         ret = clk_prepare_enable(sii902x->audio.mclk);
 671         if (ret) {
 672                 dev_err(dev, "Enabling mclk failed: %d\n", ret);
 673                 return ret;
 674         }
 675
 676         if (sii902x->audio.mclk) {
 677                 mclk_rate = clk_get_rate(sii902x->audio.mclk);
 678                 ret = sii902x_select_mclk_div(&i2s_config_reg,
 679                                               params->sample_rate, mclk_rate);
 680                 if (mclk_rate != ret * params->sample_rate)
 681                         dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
 682                                 mclk_rate, ret, params->sample_rate);
 683         }
 684
 685         mutex_lock(&sii902x->mutex);
 686
 687         ret = regmap_write(sii902x->regmap,
 688                            SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 689                            config_byte2_reg);
 690         if (ret < 0)
 691                 goto out;
 692
 693         ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,
 694                            i2s_config_reg);
 695         if (ret)
 696                 goto out;
 697
 698         for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) &&
 699                     sii902x->audio.i2s_fifo_sequence[i]; i++)
 700                 regmap_write(sii902x->regmap,
 701                              SII902X_TPI_I2S_ENABLE_MAPPING_REG,
 702                              sii902x->audio.i2s_fifo_sequence[i]);
 703
 704         ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,
 705                            config_byte3_reg);
 706         if (ret)
 707                 goto out;
 708
 709         ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,
 710                                 params->iec.status,
 711                                 min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,
 712                                     sizeof(params->iec.status)));
 713         if (ret)
 714                 goto out;
 715
 716         ret = hdmi_audio_infoframe_pack(&params->cea, infoframe_buf,
 717                                         sizeof(infoframe_buf));
 718         if (ret < 0) {
 719                 dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",
 720                         __func__, ret);
 721                 goto out;
 722         }
 723
 724         ret = regmap_bulk_write(sii902x->regmap,
 725                                 SII902X_TPI_MISC_INFOFRAME_BASE,
 726                                 infoframe_buf,
 727                                 min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));
 728         if (ret)
 729                 goto out;
 730
 731         /* Decode Level 0 Packets */
 732         ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02);
 733         if (ret)
 734                 goto out;
 735
 736         ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24);
 737         if (ret)
 738                 goto out;
 739
 740         ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02);
 741         if (ret)
 742                 goto out;
 743
 744         dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);
 745 out:
 746         mutex_unlock(&sii902x->mutex);
 747
 748         if (ret) {
 749                 clk_disable_unprepare(sii902x->audio.mclk);
 750                 dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
 751                         ret);
 752         }
 753
 754         return ret;
 755 }
 756
 757 static void sii902x_audio_shutdown(struct device *dev, void *data)
 758 {
 759         struct sii902x *sii902x = dev_get_drvdata(dev);
 760
 761         mutex_lock(&sii902x->mutex);
 762
 763         regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 764                      SII902X_TPI_AUDIO_INTERFACE_DISABLE);
 765
 766         mutex_unlock(&sii902x->mutex);
 767
 768         clk_disable_unprepare(sii902x->audio.mclk);
 769 }
 770
 771 static int sii902x_audio_mute(struct device *dev, void *data,
 772                               bool enable, int direction)
 773 {
 774         struct sii902x *sii902x = dev_get_drvdata(dev);
 775
 776         mutex_lock(&sii902x->mutex);
 777
 778         sii902x_mute(sii902x, enable);
 779
 780         mutex_unlock(&sii902x->mutex);
 781
 782         return 0;
 783 }
 784
 785 static int sii902x_audio_get_eld(struct device *dev, void *data,
 786                                  uint8_t *buf, size_t len)
 787 {
 788         struct sii902x *sii902x = dev_get_drvdata(dev);
 789
 790         mutex_lock(&sii902x->mutex);
 791
 792         memcpy(buf, sii902x->connector.eld,
 793                min(sizeof(sii902x->connector.eld), len));
 794
 795         mutex_unlock(&sii902x->mutex);
 796
 797         return 0;
 798 }
 799
 800 static int sii902x_audio_get_dai_id(struct snd_soc_component *component,
 801                                     struct device_node *endpoint)
 802 {
 803         struct of_endpoint of_ep;
 804         int ret;
 805
 806         ret = of_graph_parse_endpoint(endpoint, &of_ep);
 807         if (ret < 0)
 808                 return ret;
 809
 810         /*
 811          * HDMI sound should be located at reg = <3>
 812          * Return expected DAI index 0.
 813          */
 814         if (of_ep.port == SII902X_AUDIO_PORT_INDEX)
 815                 return 0;
 816
 817         return -EINVAL;
 818 }
 819
 820 static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
 821         .hw_params = sii902x_audio_hw_params,
 822         .audio_shutdown = sii902x_audio_shutdown,
 823         .mute_stream = sii902x_audio_mute,
 824         .get_eld = sii902x_audio_get_eld,
 825         .get_dai_id = sii902x_audio_get_dai_id,
 826         .no_capture_mute = 1,
 827 };
 828
 829 static int sii902x_audio_codec_init(struct sii902x *sii902x,
 830                                     struct device *dev)
 831 {
 832         static const u8 audio_fifo_id[] = {
 833                 SII902X_TPI_I2S_CONFIG_FIFO0,
 834                 SII902X_TPI_I2S_CONFIG_FIFO1,
 835                 SII902X_TPI_I2S_CONFIG_FIFO2,
 836                 SII902X_TPI_I2S_CONFIG_FIFO3,
 837         };
 838         static const u8 i2s_lane_id[] = {
 839                 SII902X_TPI_I2S_SELECT_SD0,
 840                 SII902X_TPI_I2S_SELECT_SD1,
 841                 SII902X_TPI_I2S_SELECT_SD2,
 842                 SII902X_TPI_I2S_SELECT_SD3,
 843         };
 844         struct hdmi_codec_pdata codec_data = {
 845                 .ops = &sii902x_audio_codec_ops,
 846                 .i2s = 1, /* Only i2s support for now. */
 847                 .spdif = 0,
 848                 .max_i2s_channels = 0,
 849         };
 850         u8 lanes[4];
 851         int num_lanes, i;
 852
 853         if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) {
 854                 dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n",
 855                         __func__);
 856                 return 0;
 857         }
 858
 859         num_lanes = of_property_read_variable_u8_array(dev->of_node,
 860                                                        "sil,i2s-data-lanes",
 861                                                        lanes, 1,
 862                                                        ARRAY_SIZE(lanes));
 863
 864         if (num_lanes == -EINVAL) {
 865                 dev_dbg(dev,
 866                         "%s: No \"sil,i2s-data-lanes\", use default <0>\n",
 867                         __func__);
 868                 num_lanes = 1;
 869                 lanes[0] = 0;
 870         } else if (num_lanes < 0) {
 871                 dev_err(dev,
 872                         "%s: Error gettin \"sil,i2s-data-lanes\": %d\n",
 873                         __func__, num_lanes);
 874                 return num_lanes;
 875         }
 876         codec_data.max_i2s_channels = 2 * num_lanes;
 877
 878         for (i = 0; i < num_lanes; i++)
 879                 sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |
 880                         i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE;
 881
 882         sii902x->audio.mclk = devm_clk_get_optional(dev, "mclk");
 883         if (IS_ERR(sii902x->audio.mclk)) {
 884                 dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
 885                         __func__, PTR_ERR(sii902x->audio.mclk));
 886                 return PTR_ERR(sii902x->audio.mclk);
 887         }
 888
 889         sii902x->audio.pdev = platform_device_register_data(
 890                 dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
 891                 &codec_data, sizeof(codec_data));
 892
 893         return PTR_ERR_OR_ZERO(sii902x->audio.pdev);
 894 }
 895
 896 static const struct regmap_range sii902x_volatile_ranges[] = {
 897         { .range_min = 0, .range_max = 0xff },
 898 };
 899
 900 static const struct regmap_access_table sii902x_volatile_table = {
 901         .yes_ranges = sii902x_volatile_ranges,
 902         .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
 903 };
 904
 905 static const struct regmap_config sii902x_regmap_config = {
 906         .reg_bits = 8,
 907         .val_bits = 8,
 908         .disable_locking = true, /* struct sii902x mutex should be enough */
 909         .max_register = SII902X_TPI_MISC_INFOFRAME_END,
 910         .volatile_table = &sii902x_volatile_table,
 911         .cache_type = REGCACHE_NONE,
 912 };
 913
 914 static irqreturn_t sii902x_interrupt(int irq, void *data)
 915 {
 916         struct sii902x *sii902x = data;
 917         unsigned int status = 0;
 918
 919         mutex_lock(&sii902x->mutex);
 920
 921         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 922         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
 923
 924         mutex_unlock(&sii902x->mutex);
 925
 926         if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev) {
 927                 drm_helper_hpd_irq_event(sii902x->bridge.dev);
 928                 drm_bridge_hpd_notify(&sii902x->bridge, (status & SII902X_PLUGGED_STATUS)
 929                                                                 ? connector_status_connected
 930                                                                 : connector_status_disconnected);
 931         }
 932
 933         return IRQ_HANDLED;
 934 }
 935
 936 /*
 937  * The purpose of sii902x_i2c_bypass_select is to enable the pass through
 938  * mode of the HDMI transmitter. Do not use regmap from within this function,
 939  * only use sii902x_*_unlocked functions to read/modify/write registers.
 940  * We are holding the parent adapter lock here, keep this in mind before
 941  * adding more i2c transactions.
 942  *
 943  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
 944  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
 945  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
 946  * we leave the remaining bits as we have found them.
 947  */
 948 static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
 949 {
 950         struct sii902x *sii902x = i2c_mux_priv(mux);
 951         struct device *dev = &sii902x->i2c->dev;
 952         unsigned long timeout;
 953         u8 status;
 954         int ret;
 955
 956         ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 957                                            SII902X_SYS_CTRL_DDC_BUS_REQ,
 958                                            SII902X_SYS_CTRL_DDC_BUS_REQ);
 959         if (ret)
 960                 return ret;
 961
 962         timeout = jiffies +
 963                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 964         do {
 965                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 966                                             &status);
 967                 if (ret)
 968                         return ret;
 969         } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 970                  time_before(jiffies, timeout));
 971
 972         if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 973                 dev_err(dev, "Failed to acquire the i2c bus\n");
 974                 return -ETIMEDOUT;
 975         }
 976
 977         return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 978                                       status);
 979 }
 980
 981 /*
 982  * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through
 983  * mode of the HDMI transmitter. Do not use regmap from within this function,
 984  * only use sii902x_*_unlocked functions to read/modify/write registers.
 985  * We are holding the parent adapter lock here, keep this in mind before
 986  * adding more i2c transactions.
 987  *
 988  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
 989  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
 990  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
 991  * we leave the remaining bits as we have found them.
 992  */
 993 static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
 994 {
 995         struct sii902x *sii902x = i2c_mux_priv(mux);
 996         struct device *dev = &sii902x->i2c->dev;
 997         unsigned long timeout;
 998         unsigned int retries;
 999         u8 status;
1000         int ret;
1001
1002         /*
1003          * When the HDMI transmitter is in pass through mode, we need an
1004          * (undocumented) additional delay between STOP and START conditions
1005          * to guarantee the bus won't get stuck.
1006          */
1007         udelay(30);
1008
1009         /*
1010          * Sometimes the I2C bus can stall after failure to use the
1011          * EDID channel. Retry a few times to see if things clear
1012          * up, else continue anyway.
1013          */
1014         retries = 5;
1015         do {
1016                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
1017                                             &status);
1018                 retries--;
1019         } while (ret && retries);
1020         if (ret) {
1021                 dev_err(dev, "failed to read status (%d)\n", ret);
1022                 return ret;
1023         }
1024
1025         ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
1026                                            SII902X_SYS_CTRL_DDC_BUS_REQ |
1027                                            SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
1028         if (ret)
1029                 return ret;
1030
1031         timeout = jiffies +
1032                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
1033         do {
1034                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
1035                                             &status);
1036                 if (ret)
1037                         return ret;
1038         } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
1039                            SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
1040                  time_before(jiffies, timeout));
1041
1042         if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
1043                       SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
1044                 dev_err(dev, "failed to release the i2c bus\n");
1045                 return -ETIMEDOUT;
1046         }
1047
1048         return 0;
1049 }
1050
1051 static const struct drm_bridge_timings default_sii902x_timings = {
1052         .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
1053                  | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
1054                  | DRM_BUS_FLAG_DE_HIGH,
1055 };
1056
1057 static int sii902x_init(struct sii902x *sii902x)
1058 {
1059         struct device *dev = &sii902x->i2c->dev;
1060         unsigned int status = 0;
1061         u8 chipid[4];
1062         int ret;
1063
1064         sii902x_reset(sii902x);
1065
1066         ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
1067         if (ret)
1068                 return ret;
1069
1070         ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
1071                                &chipid, 4);
1072         if (ret) {
1073                 dev_err(dev, "regmap_read failed %d\n", ret);
1074                 return ret;
1075         }
1076
1077         if (chipid[0] != 0xb0) {
1078                 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
1079                         chipid[0]);
1080                 return -EINVAL;
1081         }
1082
1083         /* Clear all pending interrupts */
1084         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
1085         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
1086
1087         if (sii902x->i2c->irq > 0) {
1088                 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
1089                              SII902X_HOTPLUG_EVENT);
1090
1091                 ret = devm_request_threaded_irq(dev, sii902x->i2c->irq, NULL,
1092                                                 sii902x_interrupt,
1093                                                 IRQF_ONESHOT, dev_name(dev),
1094                                                 sii902x);
1095                 if (ret)
1096                         return ret;
1097         }
1098
1099         ret = sii902x_audio_codec_init(sii902x, dev);
1100         if (ret)
1101                 return ret;
1102
1103         i2c_set_clientdata(sii902x->i2c, sii902x);
1104
1105         sii902x->i2cmux = i2c_mux_alloc(sii902x->i2c->adapter, dev,
1106                                         1, 0, I2C_MUX_GATE,
1107                                         sii902x_i2c_bypass_select,
1108                                         sii902x_i2c_bypass_deselect);
1109         if (!sii902x->i2cmux) {
1110                 ret = -ENOMEM;
1111                 goto err_unreg_audio;
1112         }
1113
1114         sii902x->i2cmux->priv = sii902x;
1115         ret = i2c_mux_add_adapter(sii902x->i2cmux, 0, 0);
1116         if (ret)
1117                 goto err_unreg_audio;
1118
1119         sii902x->bridge.funcs = &sii902x_bridge_funcs;
1120         sii902x->bridge.of_node = dev->of_node;
1121         sii902x->bridge.timings = &default_sii902x_timings;
1122         sii902x->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
1123
1124         if (sii902x->i2c->irq > 0)
1125                 sii902x->bridge.ops |= DRM_BRIDGE_OP_HPD;
1126
1127         drm_bridge_add(&sii902x->bridge);
1128
1129         return 0;
1130
1131 err_unreg_audio:
1132         if (!PTR_ERR_OR_ZERO(sii902x->audio.pdev))
1133                 platform_device_unregister(sii902x->audio.pdev);
1134
1135         return ret;
1136 }
1137
1138 static int sii902x_probe(struct i2c_client *client)
1139 {
1140         struct device *dev = &client->dev;
1141         struct device_node *endpoint;
1142         struct sii902x *sii902x;
1143         static const char * const supplies[] = {"iovcc", "cvcc12"};
1144         int ret;
1145
1146         ret = i2c_check_functionality(client->adapter,
1147                                       I2C_FUNC_SMBUS_BYTE_DATA);
1148         if (!ret) {
1149                 dev_err(dev, "I2C adapter not suitable\n");
1150                 return -EIO;
1151         }
1152
1153         sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
1154         if (!sii902x)
1155                 return -ENOMEM;
1156
1157         sii902x->i2c = client;
1158         sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
1159         if (IS_ERR(sii902x->regmap))
1160                 return PTR_ERR(sii902x->regmap);
1161
1162         sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
1163                                                       GPIOD_OUT_LOW);
1164         if (IS_ERR(sii902x->reset_gpio)) {
1165                 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
1166                         PTR_ERR(sii902x->reset_gpio));
1167                 return PTR_ERR(sii902x->reset_gpio);
1168         }
1169
1170         endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
1171         if (endpoint) {
1172                 struct device_node *remote = of_graph_get_remote_port_parent(endpoint);
1173
1174                 of_node_put(endpoint);
1175                 if (!remote) {
1176                         dev_err(dev, "Endpoint in port@1 unconnected\n");
1177                         return -ENODEV;
1178                 }
1179
1180                 if (!of_device_is_available(remote)) {
1181                         dev_err(dev, "port@1 remote device is disabled\n");
1182                         of_node_put(remote);
1183                         return -ENODEV;
1184                 }
1185
1186                 sii902x->next_bridge = of_drm_find_bridge(remote);
1187                 of_node_put(remote);
1188                 if (!sii902x->next_bridge)
1189                         return dev_err_probe(dev, -EPROBE_DEFER,
1190                                              "Failed to find remote bridge\n");
1191         }
1192
1193         mutex_init(&sii902x->mutex);
1194
1195         ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(supplies), supplies);
1196         if (ret < 0)
1197                 return dev_err_probe(dev, ret, "Failed to enable supplies");
1198
1199         return sii902x_init(sii902x);
1200 }
1201
1202 static void sii902x_remove(struct i2c_client *client)
1203 {
1204         struct sii902x *sii902x = i2c_get_clientdata(client);
1205
1206         drm_bridge_remove(&sii902x->bridge);
1207         i2c_mux_del_adapters(sii902x->i2cmux);
1208
1209         if (!PTR_ERR_OR_ZERO(sii902x->audio.pdev))
1210                 platform_device_unregister(sii902x->audio.pdev);
1211 }
1212
1213 static const struct of_device_id sii902x_dt_ids[] = {
1214         { .compatible = "sil,sii9022", },
1215         { }
1216 };
1217 MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
1218
1219 static const struct i2c_device_id sii902x_i2c_ids[] = {
1220         { "sii9022", 0 },
1221         { },
1222 };
1223 MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
1224
1225 static struct i2c_driver sii902x_driver = {
1226         .probe = sii902x_probe,
1227         .remove = sii902x_remove,
1228         .driver = {
1229                 .name = "sii902x",
1230                 .of_match_table = sii902x_dt_ids,
1231         },
1232         .id_table = sii902x_i2c_ids,
1233 };
1234 module_i2c_driver(sii902x_driver);
1235
1236 MODULE_AUTHOR("Boris Brezillon <[email protected]>");
1237 MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
1238 MODULE_LICENSE("GPL");