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         u32 bus_width;
 184
 185         /*
 186          * Mutex protects audio and video functions from interfering
 187          * each other, by keeping their i2c command sequences atomic.
 188          */
 189         struct mutex mutex;
 190         struct sii902x_audio {
 191                 struct platform_device *pdev;
 192                 struct clk *mclk;
 193                 u32 i2s_fifo_sequence[4];
 194         } audio;
 195 };
 196
 197 static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
 198 {
 199         union i2c_smbus_data data;
 200         int ret;
 201
 202         ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
 203                                I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data);
 204
 205         if (ret < 0)
 206                 return ret;
 207
 208         *val = data.byte;
 209         return 0;
 210 }
 211
 212 static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val)
 213 {
 214         union i2c_smbus_data data;
 215
 216         data.byte = val;
 217
 218         return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
 219                                 I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA,
 220                                 &data);
 221 }
 222
 223 static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask,
 224                                         u8 val)
 225 {
 226         int ret;
 227         u8 status;
 228
 229         ret = sii902x_read_unlocked(i2c, reg, &status);
 230         if (ret)
 231                 return ret;
 232         status &= ~mask;
 233         status |= val & mask;
 234         return sii902x_write_unlocked(i2c, reg, status);
 235 }
 236
 237 static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
 238 {
 239         return container_of(bridge, struct sii902x, bridge);
 240 }
 241
 242 static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
 243 {
 244         return container_of(con, struct sii902x, connector);
 245 }
 246
 247 static void sii902x_reset(struct sii902x *sii902x)
 248 {
 249         if (!sii902x->reset_gpio)
 250                 return;
 251
 252         gpiod_set_value_cansleep(sii902x->reset_gpio, 1);
 253
 254         /* The datasheet says treset-min = 100us. Make it 150us to be sure. */
 255         usleep_range(150, 200);
 256
 257         gpiod_set_value_cansleep(sii902x->reset_gpio, 0);
 258 }
 259
 260 static enum drm_connector_status sii902x_detect(struct sii902x *sii902x)
 261 {
 262         unsigned int status;
 263
 264         mutex_lock(&sii902x->mutex);
 265
 266         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 267
 268         mutex_unlock(&sii902x->mutex);
 269
 270         return (status & SII902X_PLUGGED_STATUS) ?
 271                connector_status_connected : connector_status_disconnected;
 272 }
 273
 274 static enum drm_connector_status
 275 sii902x_connector_detect(struct drm_connector *connector, bool force)
 276 {
 277         struct sii902x *sii902x = connector_to_sii902x(connector);
 278
 279         return sii902x_detect(sii902x);
 280 }
 281
 282 static const struct drm_connector_funcs sii902x_connector_funcs = {
 283         .detect = sii902x_connector_detect,
 284         .fill_modes = drm_helper_probe_single_connector_modes,
 285         .destroy = drm_connector_cleanup,
 286         .reset = drm_atomic_helper_connector_reset,
 287         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 288         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 289 };
 290
 291 static const struct drm_edid *sii902x_edid_read(struct sii902x *sii902x,
 292                                                 struct drm_connector *connector)
 293 {
 294         const struct drm_edid *drm_edid;
 295
 296         mutex_lock(&sii902x->mutex);
 297
 298         drm_edid = drm_edid_read_ddc(connector, sii902x->i2cmux->adapter[0]);
 299
 300         mutex_unlock(&sii902x->mutex);
 301
 302         return drm_edid;
 303 }
 304
 305 static int sii902x_get_modes(struct drm_connector *connector)
 306 {
 307         struct sii902x *sii902x = connector_to_sii902x(connector);
 308         const struct drm_edid *drm_edid;
 309         int num = 0;
 310
 311         drm_edid = sii902x_edid_read(sii902x, connector);
 312         drm_edid_connector_update(connector, drm_edid);
 313         if (drm_edid) {
 314                 num = drm_edid_connector_add_modes(connector);
 315                 drm_edid_free(drm_edid);
 316         }
 317
 318         sii902x->sink_is_hdmi = connector->display_info.is_hdmi;
 319
 320         return num;
 321 }
 322
 323 static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
 324         .get_modes = sii902x_get_modes,
 325 };
 326
 327 static void sii902x_bridge_atomic_disable(struct drm_bridge *bridge,
 328                                           struct drm_bridge_state *old_bridge_state)
 329 {
 330         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 331
 332         mutex_lock(&sii902x->mutex);
 333
 334         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 335                            SII902X_SYS_CTRL_PWR_DWN,
 336                            SII902X_SYS_CTRL_PWR_DWN);
 337
 338         mutex_unlock(&sii902x->mutex);
 339 }
 340
 341 static void sii902x_bridge_atomic_enable(struct drm_bridge *bridge,
 342                                          struct drm_bridge_state *old_bridge_state)
 343 {
 344         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 345
 346         mutex_lock(&sii902x->mutex);
 347
 348         regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
 349                            SII902X_AVI_POWER_STATE_MSK,
 350                            SII902X_AVI_POWER_STATE_D(0));
 351         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 352                            SII902X_SYS_CTRL_PWR_DWN, 0);
 353
 354         mutex_unlock(&sii902x->mutex);
 355 }
 356
 357 static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
 358                                     const struct drm_display_mode *mode,
 359                                     const struct drm_display_mode *adj)
 360 {
 361         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 362         u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
 363         struct regmap *regmap = sii902x->regmap;
 364         u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
 365         struct hdmi_avi_infoframe frame;
 366         u16 pixel_clock_10kHz = adj->clock / 10;
 367         int ret;
 368
 369         if (sii902x->sink_is_hdmi)
 370                 output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI;
 371
 372         buf[0] = pixel_clock_10kHz & 0xff;
 373         buf[1] = pixel_clock_10kHz >> 8;
 374         buf[2] = drm_mode_vrefresh(adj);
 375         buf[3] = 0x00;
 376         buf[4] = adj->hdisplay;
 377         buf[5] = adj->hdisplay >> 8;
 378         buf[6] = adj->vdisplay;
 379         buf[7] = adj->vdisplay >> 8;
 380         buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
 381                  SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
 382         buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
 383                  SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
 384
 385         mutex_lock(&sii902x->mutex);
 386
 387         ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 388                                  SII902X_SYS_CTRL_OUTPUT_MODE, output_mode);
 389         if (ret)
 390                 goto out;
 391
 392         ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
 393         if (ret)
 394                 goto out;
 395
 396         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
 397                                                        &sii902x->connector, adj);
 398         if (ret < 0) {
 399                 DRM_ERROR("couldn't fill AVI infoframe\n");
 400                 goto out;
 401         }
 402
 403         ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
 404         if (ret < 0) {
 405                 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
 406                 goto out;
 407         }
 408
 409         /* Do not send the infoframe header, but keep the CRC field. */
 410         regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
 411                           buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
 412                           HDMI_AVI_INFOFRAME_SIZE + 1);
 413
 414 out:
 415         mutex_unlock(&sii902x->mutex);
 416 }
 417
 418 static int sii902x_bridge_attach(struct drm_bridge *bridge,
 419                                  enum drm_bridge_attach_flags flags)
 420 {
 421         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 422         u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 423         struct drm_device *drm = bridge->dev;
 424         int ret;
 425
 426         if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
 427                 return drm_bridge_attach(bridge->encoder, sii902x->next_bridge,
 428                                          bridge, flags);
 429
 430         drm_connector_helper_add(&sii902x->connector,
 431                                  &sii902x_connector_helper_funcs);
 432
 433         if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
 434                 dev_err(&sii902x->i2c->dev,
 435                         "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
 436                 return -ENOTSUPP;
 437         }
 438
 439         ret = drm_connector_init(drm, &sii902x->connector,
 440                                  &sii902x_connector_funcs,
 441                                  DRM_MODE_CONNECTOR_HDMIA);
 442         if (ret)
 443                 return ret;
 444
 445         if (sii902x->i2c->irq > 0)
 446                 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
 447         else
 448                 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 449
 450         ret = drm_display_info_set_bus_formats(&sii902x->connector.display_info,
 451                                                &bus_format, 1);
 452         if (ret)
 453                 return ret;
 454
 455         drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);
 456
 457         return 0;
 458 }
 459
 460 static enum drm_connector_status sii902x_bridge_detect(struct drm_bridge *bridge)
 461 {
 462         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 463
 464         return sii902x_detect(sii902x);
 465 }
 466
 467 static const struct drm_edid *sii902x_bridge_edid_read(struct drm_bridge *bridge,
 468                                                        struct drm_connector *connector)
 469 {
 470         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 471
 472         return sii902x_edid_read(sii902x, connector);
 473 }
 474
 475 static u32 *sii902x_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
 476                                                      struct drm_bridge_state *bridge_state,
 477                                                      struct drm_crtc_state *crtc_state,
 478                                                      struct drm_connector_state *conn_state,
 479                                                      u32 output_fmt,
 480                                                      unsigned int *num_input_fmts)
 481 {
 482
 483         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 484         u32 *input_fmts;
 485
 486         *num_input_fmts = 0;
 487
 488         input_fmts = kcalloc(1, sizeof(*input_fmts), GFP_KERNEL);
 489         if (!input_fmts)
 490                 return NULL;
 491
 492         switch (sii902x->bus_width) {
 493         case 16:
 494                 input_fmts[0] = MEDIA_BUS_FMT_RGB565_1X16;
 495                 break;
 496         case 18:
 497                 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X18;
 498                 break;
 499         case 24:
 500                 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
 501                 break;
 502         default:
 503                 return NULL;
 504         }
 505
 506         *num_input_fmts = 1;
 507
 508         return input_fmts;
 509 }
 510
 511 static int sii902x_bridge_atomic_check(struct drm_bridge *bridge,
 512                                        struct drm_bridge_state *bridge_state,
 513                                        struct drm_crtc_state *crtc_state,
 514                                        struct drm_connector_state *conn_state)
 515 {
 516         if (crtc_state->mode.clock < SII902X_MIN_PIXEL_CLOCK_KHZ ||
 517             crtc_state->mode.clock > SII902X_MAX_PIXEL_CLOCK_KHZ)
 518                 return -EINVAL;
 519
 520         /*
 521          * There might be flags negotiation supported in future but
 522          * set the bus flags in atomic_check statically for now.
 523          */
 524         bridge_state->input_bus_cfg.flags = bridge->timings->input_bus_flags;
 525
 526         return 0;
 527 }
 528
 529 static enum drm_mode_status
 530 sii902x_bridge_mode_valid(struct drm_bridge *bridge,
 531                           const struct drm_display_info *info,
 532                           const struct drm_display_mode *mode)
 533 {
 534         if (mode->clock < SII902X_MIN_PIXEL_CLOCK_KHZ)
 535                 return MODE_CLOCK_LOW;
 536
 537         if (mode->clock > SII902X_MAX_PIXEL_CLOCK_KHZ)
 538                 return MODE_CLOCK_HIGH;
 539
 540         return MODE_OK;
 541 }
 542
 543 static const struct drm_bridge_funcs sii902x_bridge_funcs = {
 544         .attach = sii902x_bridge_attach,
 545         .mode_set = sii902x_bridge_mode_set,
 546         .atomic_disable = sii902x_bridge_atomic_disable,
 547         .atomic_enable = sii902x_bridge_atomic_enable,
 548         .detect = sii902x_bridge_detect,
 549         .edid_read = sii902x_bridge_edid_read,
 550         .atomic_reset = drm_atomic_helper_bridge_reset,
 551         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 552         .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 553         .atomic_get_input_bus_fmts = sii902x_bridge_atomic_get_input_bus_fmts,
 554         .atomic_check = sii902x_bridge_atomic_check,
 555         .mode_valid = sii902x_bridge_mode_valid,
 556 };
 557
 558 static int sii902x_mute(struct sii902x *sii902x, bool mute)
 559 {
 560         struct device *dev = &sii902x->i2c->dev;
 561         unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :
 562                 SII902X_TPI_AUDIO_MUTE_DISABLE;
 563
 564         dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");
 565
 566         return regmap_update_bits(sii902x->regmap,
 567                                   SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 568                                   SII902X_TPI_AUDIO_MUTE_ENABLE, val);
 569 }
 570
 571 static const int sii902x_mclk_div_table[] = {
 572         128, 256, 384, 512, 768, 1024, 1152, 192 };
 573
 574 static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,
 575                                    unsigned int mclk)
 576 {
 577         int div = mclk / rate;
 578         int distance = 100000;
 579         u8 i, nearest = 0;
 580
 581         for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
 582                 unsigned int d = abs(div - sii902x_mclk_div_table[i]);
 583
 584                 if (d >= distance)
 585                         continue;
 586
 587                 nearest = i;
 588                 distance = d;
 589                 if (d == 0)
 590                         break;
 591         }
 592
 593         *i2s_config_reg |= nearest << 4;
 594
 595         return sii902x_mclk_div_table[nearest];
 596 }
 597
 598 static const struct sii902x_sample_freq {
 599         u32 freq;
 600         u8 val;
 601 } sii902x_sample_freq[] = {
 602         { .freq = 32000,        .val = SII902X_TPI_AUDIO_FREQ_32KHZ },
 603         { .freq = 44000,        .val = SII902X_TPI_AUDIO_FREQ_44KHZ },
 604         { .freq = 48000,        .val = SII902X_TPI_AUDIO_FREQ_48KHZ },
 605         { .freq = 88000,        .val = SII902X_TPI_AUDIO_FREQ_88KHZ },
 606         { .freq = 96000,        .val = SII902X_TPI_AUDIO_FREQ_96KHZ },
 607         { .freq = 176000,       .val = SII902X_TPI_AUDIO_FREQ_176KHZ },
 608         { .freq = 192000,       .val = SII902X_TPI_AUDIO_FREQ_192KHZ },
 609 };
 610
 611 static int sii902x_audio_hw_params(struct device *dev, void *data,
 612                                    struct hdmi_codec_daifmt *daifmt,
 613                                    struct hdmi_codec_params *params)
 614 {
 615         struct sii902x *sii902x = dev_get_drvdata(dev);
 616         u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;
 617         u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |
 618                                SII902X_TPI_AUDIO_MUTE_ENABLE |
 619                                SII902X_TPI_AUDIO_CODING_PCM);
 620         u8 config_byte3_reg = 0;
 621         u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];
 622         unsigned long mclk_rate;
 623         int i, ret;
 624
 625         if (daifmt->bit_clk_provider || daifmt->frame_clk_provider) {
 626                 dev_dbg(dev, "%s: I2S clock provider mode not supported\n",
 627                         __func__);
 628                 return -EINVAL;
 629         }
 630
 631         switch (daifmt->fmt) {
 632         case HDMI_I2S:
 633                 i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |
 634                         SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
 635                 break;
 636         case HDMI_RIGHT_J:
 637                 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;
 638                 break;
 639         case HDMI_LEFT_J:
 640                 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
 641                 break;
 642         default:
 643                 dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,
 644                         daifmt->fmt);
 645                 return -EINVAL;
 646         }
 647
 648         if (daifmt->bit_clk_inv)
 649                 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;
 650         else
 651                 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;
 652
 653         if (daifmt->frame_clk_inv)
 654                 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;
 655         else
 656                 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;
 657
 658         if (params->channels > 2)
 659                 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;
 660         else
 661                 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;
 662
 663         switch (params->sample_width) {
 664         case 16:
 665                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;
 666                 break;
 667         case 20:
 668                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;
 669                 break;
 670         case 24:
 671         case 32:
 672                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;
 673                 break;
 674         default:
 675                 dev_err(dev, "%s: Unsupported sample width %u\n", __func__,
 676                         params->sample_width);
 677                 return -EINVAL;
 678         }
 679
 680         for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {
 681                 if (params->sample_rate == sii902x_sample_freq[i].freq) {
 682                         config_byte3_reg |= sii902x_sample_freq[i].val;
 683                         break;
 684                 }
 685         }
 686
 687         ret = clk_prepare_enable(sii902x->audio.mclk);
 688         if (ret) {
 689                 dev_err(dev, "Enabling mclk failed: %d\n", ret);
 690                 return ret;
 691         }
 692
 693         if (sii902x->audio.mclk) {
 694                 mclk_rate = clk_get_rate(sii902x->audio.mclk);
 695                 ret = sii902x_select_mclk_div(&i2s_config_reg,
 696                                               params->sample_rate, mclk_rate);
 697                 if (mclk_rate != ret * params->sample_rate)
 698                         dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
 699                                 mclk_rate, ret, params->sample_rate);
 700         }
 701
 702         mutex_lock(&sii902x->mutex);
 703
 704         ret = regmap_write(sii902x->regmap,
 705                            SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 706                            config_byte2_reg);
 707         if (ret < 0)
 708                 goto out;
 709
 710         ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,
 711                            i2s_config_reg);
 712         if (ret)
 713                 goto out;
 714
 715         for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) &&
 716                     sii902x->audio.i2s_fifo_sequence[i]; i++)
 717                 regmap_write(sii902x->regmap,
 718                              SII902X_TPI_I2S_ENABLE_MAPPING_REG,
 719                              sii902x->audio.i2s_fifo_sequence[i]);
 720
 721         ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,
 722                            config_byte3_reg);
 723         if (ret)
 724                 goto out;
 725
 726         ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,
 727                                 params->iec.status,
 728                                 min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,
 729                                     sizeof(params->iec.status)));
 730         if (ret)
 731                 goto out;
 732
 733         ret = hdmi_audio_infoframe_pack(&params->cea, infoframe_buf,
 734                                         sizeof(infoframe_buf));
 735         if (ret < 0) {
 736                 dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",
 737                         __func__, ret);
 738                 goto out;
 739         }
 740
 741         ret = regmap_bulk_write(sii902x->regmap,
 742                                 SII902X_TPI_MISC_INFOFRAME_BASE,
 743                                 infoframe_buf,
 744                                 min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));
 745         if (ret)
 746                 goto out;
 747
 748         /* Decode Level 0 Packets */
 749         ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02);
 750         if (ret)
 751                 goto out;
 752
 753         ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24);
 754         if (ret)
 755                 goto out;
 756
 757         ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02);
 758         if (ret)
 759                 goto out;
 760
 761         dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);
 762 out:
 763         mutex_unlock(&sii902x->mutex);
 764
 765         if (ret) {
 766                 clk_disable_unprepare(sii902x->audio.mclk);
 767                 dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
 768                         ret);
 769         }
 770
 771         return ret;
 772 }
 773
 774 static void sii902x_audio_shutdown(struct device *dev, void *data)
 775 {
 776         struct sii902x *sii902x = dev_get_drvdata(dev);
 777
 778         mutex_lock(&sii902x->mutex);
 779
 780         regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 781                      SII902X_TPI_AUDIO_INTERFACE_DISABLE);
 782
 783         mutex_unlock(&sii902x->mutex);
 784
 785         clk_disable_unprepare(sii902x->audio.mclk);
 786 }
 787
 788 static int sii902x_audio_mute(struct device *dev, void *data,
 789                               bool enable, int direction)
 790 {
 791         struct sii902x *sii902x = dev_get_drvdata(dev);
 792
 793         mutex_lock(&sii902x->mutex);
 794
 795         sii902x_mute(sii902x, enable);
 796
 797         mutex_unlock(&sii902x->mutex);
 798
 799         return 0;
 800 }
 801
 802 static int sii902x_audio_get_eld(struct device *dev, void *data,
 803                                  uint8_t *buf, size_t len)
 804 {
 805         struct sii902x *sii902x = dev_get_drvdata(dev);
 806
 807         mutex_lock(&sii902x->mutex);
 808
 809         memcpy(buf, sii902x->connector.eld,
 810                min(sizeof(sii902x->connector.eld), len));
 811
 812         mutex_unlock(&sii902x->mutex);
 813
 814         return 0;
 815 }
 816
 817 static int sii902x_audio_get_dai_id(struct snd_soc_component *component,
 818                                     struct device_node *endpoint)
 819 {
 820         struct of_endpoint of_ep;
 821         int ret;
 822
 823         ret = of_graph_parse_endpoint(endpoint, &of_ep);
 824         if (ret < 0)
 825                 return ret;
 826
 827         /*
 828          * HDMI sound should be located at reg = <3>
 829          * Return expected DAI index 0.
 830          */
 831         if (of_ep.port == SII902X_AUDIO_PORT_INDEX)
 832                 return 0;
 833
 834         return -EINVAL;
 835 }
 836
 837 static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
 838         .hw_params = sii902x_audio_hw_params,
 839         .audio_shutdown = sii902x_audio_shutdown,
 840         .mute_stream = sii902x_audio_mute,
 841         .get_eld = sii902x_audio_get_eld,
 842         .get_dai_id = sii902x_audio_get_dai_id,
 843         .no_capture_mute = 1,
 844 };
 845
 846 static int sii902x_audio_codec_init(struct sii902x *sii902x,
 847                                     struct device *dev)
 848 {
 849         static const u8 audio_fifo_id[] = {
 850                 SII902X_TPI_I2S_CONFIG_FIFO0,
 851                 SII902X_TPI_I2S_CONFIG_FIFO1,
 852                 SII902X_TPI_I2S_CONFIG_FIFO2,
 853                 SII902X_TPI_I2S_CONFIG_FIFO3,
 854         };
 855         static const u8 i2s_lane_id[] = {
 856                 SII902X_TPI_I2S_SELECT_SD0,
 857                 SII902X_TPI_I2S_SELECT_SD1,
 858                 SII902X_TPI_I2S_SELECT_SD2,
 859                 SII902X_TPI_I2S_SELECT_SD3,
 860         };
 861         struct hdmi_codec_pdata codec_data = {
 862                 .ops = &sii902x_audio_codec_ops,
 863                 .i2s = 1, /* Only i2s support for now. */
 864                 .spdif = 0,
 865                 .max_i2s_channels = 0,
 866         };
 867         u8 lanes[4];
 868         int num_lanes, i;
 869
 870         if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) {
 871                 dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n",
 872                         __func__);
 873                 return 0;
 874         }
 875
 876         num_lanes = of_property_read_variable_u8_array(dev->of_node,
 877                                                        "sil,i2s-data-lanes",
 878                                                        lanes, 1,
 879                                                        ARRAY_SIZE(lanes));
 880
 881         if (num_lanes == -EINVAL) {
 882                 dev_dbg(dev,
 883                         "%s: No \"sil,i2s-data-lanes\", use default <0>\n",
 884                         __func__);
 885                 num_lanes = 1;
 886                 lanes[0] = 0;
 887         } else if (num_lanes < 0) {
 888                 dev_err(dev,
 889                         "%s: Error gettin \"sil,i2s-data-lanes\": %d\n",
 890                         __func__, num_lanes);
 891                 return num_lanes;
 892         }
 893         codec_data.max_i2s_channels = 2 * num_lanes;
 894
 895         for (i = 0; i < num_lanes; i++)
 896                 sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |
 897                         i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE;
 898
 899         sii902x->audio.mclk = devm_clk_get_optional(dev, "mclk");
 900         if (IS_ERR(sii902x->audio.mclk)) {
 901                 dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
 902                         __func__, PTR_ERR(sii902x->audio.mclk));
 903                 return PTR_ERR(sii902x->audio.mclk);
 904         }
 905
 906         sii902x->audio.pdev = platform_device_register_data(
 907                 dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
 908                 &codec_data, sizeof(codec_data));
 909
 910         return PTR_ERR_OR_ZERO(sii902x->audio.pdev);
 911 }
 912
 913 static const struct regmap_range sii902x_volatile_ranges[] = {
 914         { .range_min = 0, .range_max = 0xff },
 915 };
 916
 917 static const struct regmap_access_table sii902x_volatile_table = {
 918         .yes_ranges = sii902x_volatile_ranges,
 919         .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
 920 };
 921
 922 static const struct regmap_config sii902x_regmap_config = {
 923         .reg_bits = 8,
 924         .val_bits = 8,
 925         .disable_locking = true, /* struct sii902x mutex should be enough */
 926         .max_register = SII902X_TPI_MISC_INFOFRAME_END,
 927         .volatile_table = &sii902x_volatile_table,
 928         .cache_type = REGCACHE_NONE,
 929 };
 930
 931 static irqreturn_t sii902x_interrupt(int irq, void *data)
 932 {
 933         struct sii902x *sii902x = data;
 934         unsigned int status = 0;
 935
 936         mutex_lock(&sii902x->mutex);
 937
 938         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 939         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
 940
 941         mutex_unlock(&sii902x->mutex);
 942
 943         if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev) {
 944                 drm_helper_hpd_irq_event(sii902x->bridge.dev);
 945                 drm_bridge_hpd_notify(&sii902x->bridge, (status & SII902X_PLUGGED_STATUS)
 946                                                                 ? connector_status_connected
 947                                                                 : connector_status_disconnected);
 948         }
 949
 950         return IRQ_HANDLED;
 951 }
 952
 953 /*
 954  * The purpose of sii902x_i2c_bypass_select is to enable the pass through
 955  * mode of the HDMI transmitter. Do not use regmap from within this function,
 956  * only use sii902x_*_unlocked functions to read/modify/write registers.
 957  * We are holding the parent adapter lock here, keep this in mind before
 958  * adding more i2c transactions.
 959  *
 960  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
 961  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
 962  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
 963  * we leave the remaining bits as we have found them.
 964  */
 965 static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
 966 {
 967         struct sii902x *sii902x = i2c_mux_priv(mux);
 968         struct device *dev = &sii902x->i2c->dev;
 969         unsigned long timeout;
 970         u8 status;
 971         int ret;
 972
 973         ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 974                                            SII902X_SYS_CTRL_DDC_BUS_REQ,
 975                                            SII902X_SYS_CTRL_DDC_BUS_REQ);
 976         if (ret)
 977                 return ret;
 978
 979         timeout = jiffies +
 980                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 981         do {
 982                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 983                                             &status);
 984                 if (ret)
 985                         return ret;
 986         } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 987                  time_before(jiffies, timeout));
 988
 989         if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 990                 dev_err(dev, "Failed to acquire the i2c bus\n");
 991                 return -ETIMEDOUT;
 992         }
 993
 994         return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 995                                       status);
 996 }
 997
 998 /*
 999  * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through
1000  * mode of the HDMI transmitter. Do not use regmap from within this function,
1001  * only use sii902x_*_unlocked functions to read/modify/write registers.
1002  * We are holding the parent adapter lock here, keep this in mind before
1003  * adding more i2c transactions.
1004  *
1005  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
1006  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
1007  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
1008  * we leave the remaining bits as we have found them.
1009  */
1010 static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
1011 {
1012         struct sii902x *sii902x = i2c_mux_priv(mux);
1013         struct device *dev = &sii902x->i2c->dev;
1014         unsigned long timeout;
1015         unsigned int retries;
1016         u8 status;
1017         int ret;
1018
1019         /*
1020          * When the HDMI transmitter is in pass through mode, we need an
1021          * (undocumented) additional delay between STOP and START conditions
1022          * to guarantee the bus won't get stuck.
1023          */
1024         udelay(30);
1025
1026         /*
1027          * Sometimes the I2C bus can stall after failure to use the
1028          * EDID channel. Retry a few times to see if things clear
1029          * up, else continue anyway.
1030          */
1031         retries = 5;
1032         do {
1033                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
1034                                             &status);
1035                 retries--;
1036         } while (ret && retries);
1037         if (ret) {
1038                 dev_err(dev, "failed to read status (%d)\n", ret);
1039                 return ret;
1040         }
1041
1042         ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
1043                                            SII902X_SYS_CTRL_DDC_BUS_REQ |
1044                                            SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
1045         if (ret)
1046                 return ret;
1047
1048         timeout = jiffies +
1049                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
1050         do {
1051                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
1052                                             &status);
1053                 if (ret)
1054                         return ret;
1055         } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
1056                            SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
1057                  time_before(jiffies, timeout));
1058
1059         if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
1060                       SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
1061                 dev_err(dev, "failed to release the i2c bus\n");
1062                 return -ETIMEDOUT;
1063         }
1064
1065         return 0;
1066 }
1067
1068 static const struct drm_bridge_timings default_sii902x_timings = {
1069         .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
1070                  | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
1071                  | DRM_BUS_FLAG_DE_HIGH,
1072 };
1073
1074 static int sii902x_init(struct sii902x *sii902x)
1075 {
1076         struct device *dev = &sii902x->i2c->dev;
1077         unsigned int status = 0;
1078         u8 chipid[4];
1079         int ret;
1080
1081         sii902x_reset(sii902x);
1082
1083         ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
1084         if (ret)
1085                 return ret;
1086
1087         ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
1088                                &chipid, 4);
1089         if (ret) {
1090                 dev_err(dev, "regmap_read failed %d\n", ret);
1091                 return ret;
1092         }
1093
1094         if (chipid[0] != 0xb0) {
1095                 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
1096                         chipid[0]);
1097                 return -EINVAL;
1098         }
1099
1100         /* Clear all pending interrupts */
1101         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
1102         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
1103
1104         if (sii902x->i2c->irq > 0) {
1105                 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
1106                              SII902X_HOTPLUG_EVENT);
1107
1108                 ret = devm_request_threaded_irq(dev, sii902x->i2c->irq, NULL,
1109                                                 sii902x_interrupt,
1110                                                 IRQF_ONESHOT, dev_name(dev),
1111                                                 sii902x);
1112                 if (ret)
1113                         return ret;
1114         }
1115
1116         ret = sii902x_audio_codec_init(sii902x, dev);
1117         if (ret)
1118                 return ret;
1119
1120         i2c_set_clientdata(sii902x->i2c, sii902x);
1121
1122         sii902x->i2cmux = i2c_mux_alloc(sii902x->i2c->adapter, dev,
1123                                         1, 0, I2C_MUX_GATE,
1124                                         sii902x_i2c_bypass_select,
1125                                         sii902x_i2c_bypass_deselect);
1126         if (!sii902x->i2cmux) {
1127                 ret = -ENOMEM;
1128                 goto err_unreg_audio;
1129         }
1130
1131         sii902x->i2cmux->priv = sii902x;
1132         ret = i2c_mux_add_adapter(sii902x->i2cmux, 0, 0);
1133         if (ret)
1134                 goto err_unreg_audio;
1135
1136         sii902x->bridge.funcs = &sii902x_bridge_funcs;
1137         sii902x->bridge.of_node = dev->of_node;
1138         sii902x->bridge.timings = &default_sii902x_timings;
1139         sii902x->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
1140
1141         if (sii902x->i2c->irq > 0)
1142                 sii902x->bridge.ops |= DRM_BRIDGE_OP_HPD;
1143
1144         drm_bridge_add(&sii902x->bridge);
1145
1146         return 0;
1147
1148 err_unreg_audio:
1149         if (!PTR_ERR_OR_ZERO(sii902x->audio.pdev))
1150                 platform_device_unregister(sii902x->audio.pdev);
1151
1152         return ret;
1153 }
1154
1155 static int sii902x_probe(struct i2c_client *client)
1156 {
1157         struct device *dev = &client->dev;
1158         struct device_node *endpoint;
1159         struct sii902x *sii902x;
1160         static const char * const supplies[] = {"iovcc", "cvcc12"};
1161         int ret;
1162
1163         ret = i2c_check_functionality(client->adapter,
1164                                       I2C_FUNC_SMBUS_BYTE_DATA);
1165         if (!ret) {
1166                 dev_err(dev, "I2C adapter not suitable\n");
1167                 return -EIO;
1168         }
1169
1170         sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
1171         if (!sii902x)
1172                 return -ENOMEM;
1173
1174         sii902x->i2c = client;
1175         sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
1176         if (IS_ERR(sii902x->regmap))
1177                 return PTR_ERR(sii902x->regmap);
1178
1179         sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
1180                                                       GPIOD_OUT_LOW);
1181         if (IS_ERR(sii902x->reset_gpio)) {
1182                 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
1183                         PTR_ERR(sii902x->reset_gpio));
1184                 return PTR_ERR(sii902x->reset_gpio);
1185         }
1186
1187         sii902x->bus_width = 24;
1188         endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
1189         if (endpoint)
1190                 of_property_read_u32(endpoint, "bus-width", &sii902x->bus_width);
1191
1192         endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
1193         if (endpoint) {
1194                 struct device_node *remote = of_graph_get_remote_port_parent(endpoint);
1195
1196                 of_node_put(endpoint);
1197                 if (!remote) {
1198                         dev_err(dev, "Endpoint in port@1 unconnected\n");
1199                         return -ENODEV;
1200                 }
1201
1202                 if (!of_device_is_available(remote)) {
1203                         dev_err(dev, "port@1 remote device is disabled\n");
1204                         of_node_put(remote);
1205                         return -ENODEV;
1206                 }
1207
1208                 sii902x->next_bridge = of_drm_find_bridge(remote);
1209                 of_node_put(remote);
1210                 if (!sii902x->next_bridge)
1211                         return dev_err_probe(dev, -EPROBE_DEFER,
1212                                              "Failed to find remote bridge\n");
1213         }
1214
1215         mutex_init(&sii902x->mutex);
1216
1217         ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(supplies), supplies);
1218         if (ret < 0)
1219                 return dev_err_probe(dev, ret, "Failed to enable supplies");
1220
1221         return sii902x_init(sii902x);
1222 }
1223
1224 static void sii902x_remove(struct i2c_client *client)
1225 {
1226         struct sii902x *sii902x = i2c_get_clientdata(client);
1227
1228         drm_bridge_remove(&sii902x->bridge);
1229         i2c_mux_del_adapters(sii902x->i2cmux);
1230
1231         if (!PTR_ERR_OR_ZERO(sii902x->audio.pdev))
1232                 platform_device_unregister(sii902x->audio.pdev);
1233 }
1234
1235 static const struct of_device_id sii902x_dt_ids[] = {
1236         { .compatible = "sil,sii9022", },
1237         { }
1238 };
1239 MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
1240
1241 static const struct i2c_device_id sii902x_i2c_ids[] = {
1242         { "sii9022", 0 },
1243         { },
1244 };
1245 MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
1246
1247 static struct i2c_driver sii902x_driver = {
1248         .probe = sii902x_probe,
1249         .remove = sii902x_remove,
1250         .driver = {
1251                 .name = "sii902x",
1252                 .of_match_table = sii902x_dt_ids,
1253         },
1254         .id_table = sii902x_i2c_ids,
1255 };
1256 module_i2c_driver(sii902x_driver);
1257
1258 MODULE_AUTHOR("Boris Brezillon <[email protected]>");
1259 MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
1260 MODULE_LICENSE("GPL");