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 <voice.shen@atmel.com>
   7  *
   8  * Authors:           Bo Shen <voice.shen@atmel.com>
   9  *                    Boris Brezillon <boris.brezillon@free-electrons.com>
  10  *                    Wu, Songjun <Songjun.Wu@atmel.com>
  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/module.h>
  19 #include <linux/regmap.h>
  20 #include <linux/clk.h>
  21
  22 #include <drm/drm_atomic_helper.h>
  23 #include <drm/drm_drv.h>
  24 #include <drm/drm_edid.h>
  25 #include <drm/drm_print.h>
  26 #include <drm/drm_probe_helper.h>
  27
  28 #include <sound/hdmi-codec.h>
  29
  30 #define SII902X_TPI_VIDEO_DATA                  0x0
  31
  32 #define SII902X_TPI_PIXEL_REPETITION            0x8
  33 #define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT     BIT(5)
  34 #define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE   BIT(4)
  35 #define SII902X_TPI_AVI_PIXEL_REP_4X            3
  36 #define SII902X_TPI_AVI_PIXEL_REP_2X            1
  37 #define SII902X_TPI_AVI_PIXEL_REP_NONE          0
  38 #define SII902X_TPI_CLK_RATIO_HALF              (0 << 6)
  39 #define SII902X_TPI_CLK_RATIO_1X                (1 << 6)
  40 #define SII902X_TPI_CLK_RATIO_2X                (2 << 6)
  41 #define SII902X_TPI_CLK_RATIO_4X                (3 << 6)
  42
  43 #define SII902X_TPI_AVI_IN_FORMAT               0x9
  44 #define SII902X_TPI_AVI_INPUT_BITMODE_12BIT     BIT(7)
  45 #define SII902X_TPI_AVI_INPUT_DITHER            BIT(6)
  46 #define SII902X_TPI_AVI_INPUT_RANGE_LIMITED     (2 << 2)
  47 #define SII902X_TPI_AVI_INPUT_RANGE_FULL        (1 << 2)
  48 #define SII902X_TPI_AVI_INPUT_RANGE_AUTO        (0 << 2)
  49 #define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK  (3 << 0)
  50 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
  51 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
  52 #define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB    (0 << 0)
  53
  54 #define SII902X_TPI_AVI_INFOFRAME               0x0c
  55
  56 #define SII902X_SYS_CTRL_DATA                   0x1a
  57 #define SII902X_SYS_CTRL_PWR_DWN                BIT(4)
  58 #define SII902X_SYS_CTRL_AV_MUTE                BIT(3)
  59 #define SII902X_SYS_CTRL_DDC_BUS_REQ            BIT(2)
  60 #define SII902X_SYS_CTRL_DDC_BUS_GRTD           BIT(1)
  61 #define SII902X_SYS_CTRL_OUTPUT_MODE            BIT(0)
  62 #define SII902X_SYS_CTRL_OUTPUT_HDMI            1
  63 #define SII902X_SYS_CTRL_OUTPUT_DVI             0
  64
  65 #define SII902X_REG_CHIPID(n)                   (0x1b + (n))
  66
  67 #define SII902X_PWR_STATE_CTRL                  0x1e
  68 #define SII902X_AVI_POWER_STATE_MSK             GENMASK(1, 0)
  69 #define SII902X_AVI_POWER_STATE_D(l)            ((l) & SII902X_AVI_POWER_STATE_MSK)
  70
  71 /* Audio  */
  72 #define SII902X_TPI_I2S_ENABLE_MAPPING_REG      0x1f
  73 #define SII902X_TPI_I2S_CONFIG_FIFO0                    (0 << 0)
  74 #define SII902X_TPI_I2S_CONFIG_FIFO1                    (1 << 0)
  75 #define SII902X_TPI_I2S_CONFIG_FIFO2                    (2 << 0)
  76 #define SII902X_TPI_I2S_CONFIG_FIFO3                    (3 << 0)
  77 #define SII902X_TPI_I2S_LEFT_RIGHT_SWAP                 (1 << 2)
  78 #define SII902X_TPI_I2S_AUTO_DOWNSAMPLE                 (1 << 3)
  79 #define SII902X_TPI_I2S_SELECT_SD0                      (0 << 4)
  80 #define SII902X_TPI_I2S_SELECT_SD1                      (1 << 4)
  81 #define SII902X_TPI_I2S_SELECT_SD2                      (2 << 4)
  82 #define SII902X_TPI_I2S_SELECT_SD3                      (3 << 4)
  83 #define SII902X_TPI_I2S_FIFO_ENABLE                     (1 << 7)
  84
  85 #define SII902X_TPI_I2S_INPUT_CONFIG_REG        0x20
  86 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES             (0 << 0)
  87 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_NO              (1 << 0)
  88 #define SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST          (0 << 1)
  89 #define SII902X_TPI_I2S_SD_DIRECTION_LSB_FIRST          (1 << 1)
  90 #define SII902X_TPI_I2S_SD_JUSTIFY_LEFT                 (0 << 2)
  91 #define SII902X_TPI_I2S_SD_JUSTIFY_RIGHT                (1 << 2)
  92 #define SII902X_TPI_I2S_WS_POLARITY_LOW                 (0 << 3)
  93 #define SII902X_TPI_I2S_WS_POLARITY_HIGH                (1 << 3)
  94 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_128             (0 << 4)
  95 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_256             (1 << 4)
  96 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_384             (2 << 4)
  97 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_512             (3 << 4)
  98 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_768             (4 << 4)
  99 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1024            (5 << 4)
 100 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1152            (6 << 4)
 101 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_192             (7 << 4)
 102 #define SII902X_TPI_I2S_SCK_EDGE_FALLING                (0 << 7)
 103 #define SII902X_TPI_I2S_SCK_EDGE_RISING                 (1 << 7)
 104
 105 #define SII902X_TPI_I2S_STRM_HDR_BASE   0x21
 106 #define SII902X_TPI_I2S_STRM_HDR_SIZE   5
 107
 108 #define SII902X_TPI_AUDIO_CONFIG_BYTE2_REG      0x26
 109 #define SII902X_TPI_AUDIO_CODING_STREAM_HEADER          (0 << 0)
 110 #define SII902X_TPI_AUDIO_CODING_PCM                    (1 << 0)
 111 #define SII902X_TPI_AUDIO_CODING_AC3                    (2 << 0)
 112 #define SII902X_TPI_AUDIO_CODING_MPEG1                  (3 << 0)
 113 #define SII902X_TPI_AUDIO_CODING_MP3                    (4 << 0)
 114 #define SII902X_TPI_AUDIO_CODING_MPEG2                  (5 << 0)
 115 #define SII902X_TPI_AUDIO_CODING_AAC                    (6 << 0)
 116 #define SII902X_TPI_AUDIO_CODING_DTS                    (7 << 0)
 117 #define SII902X_TPI_AUDIO_CODING_ATRAC                  (8 << 0)
 118 #define SII902X_TPI_AUDIO_MUTE_DISABLE                  (0 << 4)
 119 #define SII902X_TPI_AUDIO_MUTE_ENABLE                   (1 << 4)
 120 #define SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS             (0 << 5)
 121 #define SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS             (1 << 5)
 122 #define SII902X_TPI_AUDIO_INTERFACE_DISABLE             (0 << 6)
 123 #define SII902X_TPI_AUDIO_INTERFACE_SPDIF               (1 << 6)
 124 #define SII902X_TPI_AUDIO_INTERFACE_I2S                 (2 << 6)
 125
 126 #define SII902X_TPI_AUDIO_CONFIG_BYTE3_REG      0x27
 127 #define SII902X_TPI_AUDIO_FREQ_STREAM                   (0 << 3)
 128 #define SII902X_TPI_AUDIO_FREQ_32KHZ                    (1 << 3)
 129 #define SII902X_TPI_AUDIO_FREQ_44KHZ                    (2 << 3)
 130 #define SII902X_TPI_AUDIO_FREQ_48KHZ                    (3 << 3)
 131 #define SII902X_TPI_AUDIO_FREQ_88KHZ                    (4 << 3)
 132 #define SII902X_TPI_AUDIO_FREQ_96KHZ                    (5 << 3)
 133 #define SII902X_TPI_AUDIO_FREQ_176KHZ                   (6 << 3)
 134 #define SII902X_TPI_AUDIO_FREQ_192KHZ                   (7 << 3)
 135 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_STREAM            (0 << 6)
 136 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_16                (1 << 6)
 137 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_20                (2 << 6)
 138 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_24                (3 << 6)
 139
 140 #define SII902X_TPI_AUDIO_CONFIG_BYTE4_REG      0x28
 141
 142 #define SII902X_INT_ENABLE                      0x3c
 143 #define SII902X_INT_STATUS                      0x3d
 144 #define SII902X_HOTPLUG_EVENT                   BIT(0)
 145 #define SII902X_PLUGGED_STATUS                  BIT(2)
 146
 147 #define SII902X_REG_TPI_RQB                     0xc7
 148
 149 /* Indirect internal register access */
 150 #define SII902X_IND_SET_PAGE                    0xbc
 151 #define SII902X_IND_OFFSET                      0xbd
 152 #define SII902X_IND_VALUE                       0xbe
 153
 154 #define SII902X_TPI_MISC_INFOFRAME_BASE         0xbf
 155 #define SII902X_TPI_MISC_INFOFRAME_END          0xde
 156 #define SII902X_TPI_MISC_INFOFRAME_SIZE \
 157         (SII902X_TPI_MISC_INFOFRAME_END - SII902X_TPI_MISC_INFOFRAME_BASE)
 158
 159 #define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS  500
 160
 161 struct sii902x {
 162         struct i2c_client *i2c;
 163         struct regmap *regmap;
 164         struct drm_bridge bridge;
 165         struct drm_connector connector;
 166         struct gpio_desc *reset_gpio;
 167         struct i2c_mux_core *i2cmux;
 168         /*
 169          * Mutex protects audio and video functions from interfering
 170          * each other, by keeping their i2c command sequences atomic.
 171          */
 172         struct mutex mutex;
 173         struct sii902x_audio {
 174                 struct platform_device *pdev;
 175                 struct clk *mclk;
 176                 u32 i2s_fifo_sequence[4];
 177         } audio;
 178 };
 179
 180 static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
 181 {
 182         union i2c_smbus_data data;
 183         int ret;
 184
 185         ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
 186                                I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data);
 187
 188         if (ret < 0)
 189                 return ret;
 190
 191         *val = data.byte;
 192         return 0;
 193 }
 194
 195 static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val)
 196 {
 197         union i2c_smbus_data data;
 198
 199         data.byte = val;
 200
 201         return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags,
 202                                 I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA,
 203                                 &data);
 204 }
 205
 206 static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask,
 207                                         u8 val)
 208 {
 209         int ret;
 210         u8 status;
 211
 212         ret = sii902x_read_unlocked(i2c, reg, &status);
 213         if (ret)
 214                 return ret;
 215         status &= ~mask;
 216         status |= val & mask;
 217         return sii902x_write_unlocked(i2c, reg, status);
 218 }
 219
 220 static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
 221 {
 222         return container_of(bridge, struct sii902x, bridge);
 223 }
 224
 225 static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
 226 {
 227         return container_of(con, struct sii902x, connector);
 228 }
 229
 230 static void sii902x_reset(struct sii902x *sii902x)
 231 {
 232         if (!sii902x->reset_gpio)
 233                 return;
 234
 235         gpiod_set_value(sii902x->reset_gpio, 1);
 236
 237         /* The datasheet says treset-min = 100us. Make it 150us to be sure. */
 238         usleep_range(150, 200);
 239
 240         gpiod_set_value(sii902x->reset_gpio, 0);
 241 }
 242
 243 static enum drm_connector_status
 244 sii902x_connector_detect(struct drm_connector *connector, bool force)
 245 {
 246         struct sii902x *sii902x = connector_to_sii902x(connector);
 247         unsigned int status;
 248
 249         mutex_lock(&sii902x->mutex);
 250
 251         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 252
 253         mutex_unlock(&sii902x->mutex);
 254
 255         return (status & SII902X_PLUGGED_STATUS) ?
 256                connector_status_connected : connector_status_disconnected;
 257 }
 258
 259 static const struct drm_connector_funcs sii902x_connector_funcs = {
 260         .detect = sii902x_connector_detect,
 261         .fill_modes = drm_helper_probe_single_connector_modes,
 262         .destroy = drm_connector_cleanup,
 263         .reset = drm_atomic_helper_connector_reset,
 264         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 265         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 266 };
 267
 268 static int sii902x_get_modes(struct drm_connector *connector)
 269 {
 270         struct sii902x *sii902x = connector_to_sii902x(connector);
 271         u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 272         u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
 273         struct edid *edid;
 274         int num = 0, ret;
 275
 276         mutex_lock(&sii902x->mutex);
 277
 278         edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]);
 279         drm_connector_update_edid_property(connector, edid);
 280         if (edid) {
 281                 if (drm_detect_hdmi_monitor(edid))
 282                         output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI;
 283
 284                 num = drm_add_edid_modes(connector, edid);
 285                 kfree(edid);
 286         }
 287
 288         ret = drm_display_info_set_bus_formats(&connector->display_info,
 289                                                &bus_format, 1);
 290         if (ret)
 291                 goto error_out;
 292
 293         ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 294                                  SII902X_SYS_CTRL_OUTPUT_MODE, output_mode);
 295         if (ret)
 296                 goto error_out;
 297
 298         ret = num;
 299
 300 error_out:
 301         mutex_unlock(&sii902x->mutex);
 302
 303         return ret;
 304 }
 305
 306 static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
 307                                                struct drm_display_mode *mode)
 308 {
 309         /* TODO: check mode */
 310
 311         return MODE_OK;
 312 }
 313
 314 static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
 315         .get_modes = sii902x_get_modes,
 316         .mode_valid = sii902x_mode_valid,
 317 };
 318
 319 static void sii902x_bridge_disable(struct drm_bridge *bridge)
 320 {
 321         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 322
 323         mutex_lock(&sii902x->mutex);
 324
 325         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 326                            SII902X_SYS_CTRL_PWR_DWN,
 327                            SII902X_SYS_CTRL_PWR_DWN);
 328
 329         mutex_unlock(&sii902x->mutex);
 330 }
 331
 332 static void sii902x_bridge_enable(struct drm_bridge *bridge)
 333 {
 334         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 335
 336         mutex_lock(&sii902x->mutex);
 337
 338         regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
 339                            SII902X_AVI_POWER_STATE_MSK,
 340                            SII902X_AVI_POWER_STATE_D(0));
 341         regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
 342                            SII902X_SYS_CTRL_PWR_DWN, 0);
 343
 344         mutex_unlock(&sii902x->mutex);
 345 }
 346
 347 static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
 348                                     const struct drm_display_mode *mode,
 349                                     const struct drm_display_mode *adj)
 350 {
 351         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 352         struct regmap *regmap = sii902x->regmap;
 353         u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
 354         struct hdmi_avi_infoframe frame;
 355         u16 pixel_clock_10kHz = adj->clock / 10;
 356         int ret;
 357
 358         buf[0] = pixel_clock_10kHz & 0xff;
 359         buf[1] = pixel_clock_10kHz >> 8;
 360         buf[2] = adj->vrefresh;
 361         buf[3] = 0x00;
 362         buf[4] = adj->hdisplay;
 363         buf[5] = adj->hdisplay >> 8;
 364         buf[6] = adj->vdisplay;
 365         buf[7] = adj->vdisplay >> 8;
 366         buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
 367                  SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
 368         buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
 369                  SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
 370
 371         mutex_lock(&sii902x->mutex);
 372
 373         ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
 374         if (ret)
 375                 goto out;
 376
 377         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame,
 378                                                        &sii902x->connector, adj);
 379         if (ret < 0) {
 380                 DRM_ERROR("couldn't fill AVI infoframe\n");
 381                 goto out;
 382         }
 383
 384         ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
 385         if (ret < 0) {
 386                 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
 387                 goto out;
 388         }
 389
 390         /* Do not send the infoframe header, but keep the CRC field. */
 391         regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
 392                           buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
 393                           HDMI_AVI_INFOFRAME_SIZE + 1);
 394
 395 out:
 396         mutex_unlock(&sii902x->mutex);
 397 }
 398
 399 static int sii902x_bridge_attach(struct drm_bridge *bridge)
 400 {
 401         struct sii902x *sii902x = bridge_to_sii902x(bridge);
 402         struct drm_device *drm = bridge->dev;
 403         int ret;
 404
 405         drm_connector_helper_add(&sii902x->connector,
 406                                  &sii902x_connector_helper_funcs);
 407
 408         if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
 409                 dev_err(&sii902x->i2c->dev,
 410                         "sii902x driver is only compatible with DRM devices supporting atomic updates\n");
 411                 return -ENOTSUPP;
 412         }
 413
 414         ret = drm_connector_init(drm, &sii902x->connector,
 415                                  &sii902x_connector_funcs,
 416                                  DRM_MODE_CONNECTOR_HDMIA);
 417         if (ret)
 418                 return ret;
 419
 420         if (sii902x->i2c->irq > 0)
 421                 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
 422         else
 423                 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 424
 425         drm_connector_attach_encoder(&sii902x->connector, bridge->encoder);
 426
 427         return 0;
 428 }
 429
 430 static const struct drm_bridge_funcs sii902x_bridge_funcs = {
 431         .attach = sii902x_bridge_attach,
 432         .mode_set = sii902x_bridge_mode_set,
 433         .disable = sii902x_bridge_disable,
 434         .enable = sii902x_bridge_enable,
 435 };
 436
 437 static int sii902x_mute(struct sii902x *sii902x, bool mute)
 438 {
 439         struct device *dev = &sii902x->i2c->dev;
 440         unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :
 441                 SII902X_TPI_AUDIO_MUTE_DISABLE;
 442
 443         dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");
 444
 445         return regmap_update_bits(sii902x->regmap,
 446                                   SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 447                                   SII902X_TPI_AUDIO_MUTE_ENABLE, val);
 448 }
 449
 450 static const int sii902x_mclk_div_table[] = {
 451         128, 256, 384, 512, 768, 1024, 1152, 192 };
 452
 453 static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,
 454                                    unsigned int mclk)
 455 {
 456         int div = mclk / rate;
 457         int distance = 100000;
 458         u8 i, nearest = 0;
 459
 460         for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
 461                 unsigned int d = abs(div - sii902x_mclk_div_table[i]);
 462
 463                 if (d >= distance)
 464                         continue;
 465
 466                 nearest = i;
 467                 distance = d;
 468                 if (d == 0)
 469                         break;
 470         }
 471
 472         *i2s_config_reg |= nearest << 4;
 473
 474         return sii902x_mclk_div_table[nearest];
 475 }
 476
 477 static const struct sii902x_sample_freq {
 478         u32 freq;
 479         u8 val;
 480 } sii902x_sample_freq[] = {
 481         { .freq = 32000,        .val = SII902X_TPI_AUDIO_FREQ_32KHZ },
 482         { .freq = 44000,        .val = SII902X_TPI_AUDIO_FREQ_44KHZ },
 483         { .freq = 48000,        .val = SII902X_TPI_AUDIO_FREQ_48KHZ },
 484         { .freq = 88000,        .val = SII902X_TPI_AUDIO_FREQ_88KHZ },
 485         { .freq = 96000,        .val = SII902X_TPI_AUDIO_FREQ_96KHZ },
 486         { .freq = 176000,       .val = SII902X_TPI_AUDIO_FREQ_176KHZ },
 487         { .freq = 192000,       .val = SII902X_TPI_AUDIO_FREQ_192KHZ },
 488 };
 489
 490 static int sii902x_audio_hw_params(struct device *dev, void *data,
 491                                    struct hdmi_codec_daifmt *daifmt,
 492                                    struct hdmi_codec_params *params)
 493 {
 494         struct sii902x *sii902x = dev_get_drvdata(dev);
 495         u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;
 496         u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |
 497                                SII902X_TPI_AUDIO_MUTE_ENABLE |
 498                                SII902X_TPI_AUDIO_CODING_PCM);
 499         u8 config_byte3_reg = 0;
 500         u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];
 501         unsigned long mclk_rate;
 502         int i, ret;
 503
 504         if (daifmt->bit_clk_master || daifmt->frame_clk_master) {
 505                 dev_dbg(dev, "%s: I2S master mode not supported\n", __func__);
 506                 return -EINVAL;
 507         }
 508
 509         switch (daifmt->fmt) {
 510         case HDMI_I2S:
 511                 i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |
 512                         SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
 513                 break;
 514         case HDMI_RIGHT_J:
 515                 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;
 516                 break;
 517         case HDMI_LEFT_J:
 518                 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
 519                 break;
 520         default:
 521                 dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,
 522                         daifmt->fmt);
 523                 return -EINVAL;
 524         }
 525
 526         if (daifmt->bit_clk_inv)
 527                 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;
 528         else
 529                 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;
 530
 531         if (daifmt->frame_clk_inv)
 532                 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;
 533         else
 534                 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;
 535
 536         if (params->channels > 2)
 537                 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;
 538         else
 539                 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;
 540
 541         switch (params->sample_width) {
 542         case 16:
 543                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;
 544                 break;
 545         case 20:
 546                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;
 547                 break;
 548         case 24:
 549         case 32:
 550                 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;
 551                 break;
 552         default:
 553                 dev_err(dev, "%s: Unsupported sample width %u\n", __func__,
 554                         params->sample_width);
 555                 return -EINVAL;
 556         }
 557
 558         for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {
 559                 if (params->sample_rate == sii902x_sample_freq[i].freq) {
 560                         config_byte3_reg |= sii902x_sample_freq[i].val;
 561                         break;
 562                 }
 563         }
 564
 565         ret = clk_prepare_enable(sii902x->audio.mclk);
 566         if (ret) {
 567                 dev_err(dev, "Enabling mclk failed: %d\n", ret);
 568                 return ret;
 569         }
 570
 571         mclk_rate = clk_get_rate(sii902x->audio.mclk);
 572
 573         ret = sii902x_select_mclk_div(&i2s_config_reg, params->sample_rate,
 574                                       mclk_rate);
 575         if (mclk_rate != ret * params->sample_rate)
 576                 dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
 577                         mclk_rate, ret, params->sample_rate);
 578
 579         mutex_lock(&sii902x->mutex);
 580
 581         ret = regmap_write(sii902x->regmap,
 582                            SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 583                            config_byte2_reg);
 584         if (ret < 0)
 585                 goto out;
 586
 587         ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,
 588                            i2s_config_reg);
 589         if (ret)
 590                 goto out;
 591
 592         for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) &&
 593                     sii902x->audio.i2s_fifo_sequence[i]; i++)
 594                 regmap_write(sii902x->regmap,
 595                              SII902X_TPI_I2S_ENABLE_MAPPING_REG,
 596                              sii902x->audio.i2s_fifo_sequence[i]);
 597
 598         ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,
 599                            config_byte3_reg);
 600         if (ret)
 601                 goto out;
 602
 603         ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,
 604                                 params->iec.status,
 605                                 min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,
 606                                     sizeof(params->iec.status)));
 607         if (ret)
 608                 goto out;
 609
 610         ret = hdmi_audio_infoframe_pack(&params->cea, infoframe_buf,
 611                                         sizeof(infoframe_buf));
 612         if (ret < 0) {
 613                 dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",
 614                         __func__, ret);
 615                 goto out;
 616         }
 617
 618         ret = regmap_bulk_write(sii902x->regmap,
 619                                 SII902X_TPI_MISC_INFOFRAME_BASE,
 620                                 infoframe_buf,
 621                                 min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));
 622         if (ret)
 623                 goto out;
 624
 625         /* Decode Level 0 Packets */
 626         ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02);
 627         if (ret)
 628                 goto out;
 629
 630         ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24);
 631         if (ret)
 632                 goto out;
 633
 634         ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02);
 635         if (ret)
 636                 goto out;
 637
 638         dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);
 639 out:
 640         mutex_unlock(&sii902x->mutex);
 641
 642         if (ret) {
 643                 clk_disable_unprepare(sii902x->audio.mclk);
 644                 dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
 645                         ret);
 646         }
 647
 648         return ret;
 649 }
 650
 651 static void sii902x_audio_shutdown(struct device *dev, void *data)
 652 {
 653         struct sii902x *sii902x = dev_get_drvdata(dev);
 654
 655         mutex_lock(&sii902x->mutex);
 656
 657         regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
 658                      SII902X_TPI_AUDIO_INTERFACE_DISABLE);
 659
 660         mutex_unlock(&sii902x->mutex);
 661
 662         clk_disable_unprepare(sii902x->audio.mclk);
 663 }
 664
 665 int sii902x_audio_digital_mute(struct device *dev, void *data, bool enable)
 666 {
 667         struct sii902x *sii902x = dev_get_drvdata(dev);
 668
 669         mutex_lock(&sii902x->mutex);
 670
 671         sii902x_mute(sii902x, enable);
 672
 673         mutex_unlock(&sii902x->mutex);
 674
 675         return 0;
 676 }
 677
 678 static int sii902x_audio_get_eld(struct device *dev, void *data,
 679                                  uint8_t *buf, size_t len)
 680 {
 681         struct sii902x *sii902x = dev_get_drvdata(dev);
 682
 683         mutex_lock(&sii902x->mutex);
 684
 685         memcpy(buf, sii902x->connector.eld,
 686                min(sizeof(sii902x->connector.eld), len));
 687
 688         mutex_unlock(&sii902x->mutex);
 689
 690         return 0;
 691 }
 692
 693 static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
 694         .hw_params = sii902x_audio_hw_params,
 695         .audio_shutdown = sii902x_audio_shutdown,
 696         .digital_mute = sii902x_audio_digital_mute,
 697         .get_eld = sii902x_audio_get_eld,
 698 };
 699
 700 static int sii902x_audio_codec_init(struct sii902x *sii902x,
 701                                     struct device *dev)
 702 {
 703         static const u8 audio_fifo_id[] = {
 704                 SII902X_TPI_I2S_CONFIG_FIFO0,
 705                 SII902X_TPI_I2S_CONFIG_FIFO1,
 706                 SII902X_TPI_I2S_CONFIG_FIFO2,
 707                 SII902X_TPI_I2S_CONFIG_FIFO3,
 708         };
 709         static const u8 i2s_lane_id[] = {
 710                 SII902X_TPI_I2S_SELECT_SD0,
 711                 SII902X_TPI_I2S_SELECT_SD1,
 712                 SII902X_TPI_I2S_SELECT_SD2,
 713                 SII902X_TPI_I2S_SELECT_SD3,
 714         };
 715         struct hdmi_codec_pdata codec_data = {
 716                 .ops = &sii902x_audio_codec_ops,
 717                 .i2s = 1, /* Only i2s support for now. */
 718                 .spdif = 0,
 719                 .max_i2s_channels = 0,
 720         };
 721         u8 lanes[4];
 722         int num_lanes, i;
 723
 724         if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) {
 725                 dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n",
 726                         __func__);
 727                 return 0;
 728         }
 729
 730         num_lanes = of_property_read_variable_u8_array(dev->of_node,
 731                                                        "sil,i2s-data-lanes",
 732                                                        lanes, 1,
 733                                                        ARRAY_SIZE(lanes));
 734
 735         if (num_lanes == -EINVAL) {
 736                 dev_dbg(dev,
 737                         "%s: No \"sil,i2s-data-lanes\", use default <0>\n",
 738                         __func__);
 739                 num_lanes = 1;
 740                 lanes[0] = 0;
 741         } else if (num_lanes < 0) {
 742                 dev_err(dev,
 743                         "%s: Error gettin \"sil,i2s-data-lanes\": %d\n",
 744                         __func__, num_lanes);
 745                 return num_lanes;
 746         }
 747         codec_data.max_i2s_channels = 2 * num_lanes;
 748
 749         for (i = 0; i < num_lanes; i++)
 750                 sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |
 751                         i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE;
 752
 753         if (IS_ERR(sii902x->audio.mclk)) {
 754                 dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
 755                         __func__, PTR_ERR(sii902x->audio.mclk));
 756                 return 0;
 757         }
 758
 759         sii902x->audio.pdev = platform_device_register_data(
 760                 dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
 761                 &codec_data, sizeof(codec_data));
 762
 763         return PTR_ERR_OR_ZERO(sii902x->audio.pdev);
 764 }
 765
 766 static const struct regmap_range sii902x_volatile_ranges[] = {
 767         { .range_min = 0, .range_max = 0xff },
 768 };
 769
 770 static const struct regmap_access_table sii902x_volatile_table = {
 771         .yes_ranges = sii902x_volatile_ranges,
 772         .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
 773 };
 774
 775 static const struct regmap_config sii902x_regmap_config = {
 776         .reg_bits = 8,
 777         .val_bits = 8,
 778         .disable_locking = true, /* struct sii902x mutex should be enough */
 779         .max_register = SII902X_TPI_MISC_INFOFRAME_END,
 780         .volatile_table = &sii902x_volatile_table,
 781         .cache_type = REGCACHE_NONE,
 782 };
 783
 784 static irqreturn_t sii902x_interrupt(int irq, void *data)
 785 {
 786         struct sii902x *sii902x = data;
 787         unsigned int status = 0;
 788
 789         mutex_lock(&sii902x->mutex);
 790
 791         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 792         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
 793
 794         mutex_unlock(&sii902x->mutex);
 795
 796         if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev)
 797                 drm_helper_hpd_irq_event(sii902x->bridge.dev);
 798
 799         return IRQ_HANDLED;
 800 }
 801
 802 /*
 803  * The purpose of sii902x_i2c_bypass_select is to enable the pass through
 804  * mode of the HDMI transmitter. Do not use regmap from within this function,
 805  * only use sii902x_*_unlocked functions to read/modify/write registers.
 806  * We are holding the parent adapter lock here, keep this in mind before
 807  * adding more i2c transactions.
 808  *
 809  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
 810  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
 811  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
 812  * we leave the remaining bits as we have found them.
 813  */
 814 static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id)
 815 {
 816         struct sii902x *sii902x = i2c_mux_priv(mux);
 817         struct device *dev = &sii902x->i2c->dev;
 818         unsigned long timeout;
 819         u8 status;
 820         int ret;
 821
 822         ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 823                                            SII902X_SYS_CTRL_DDC_BUS_REQ,
 824                                            SII902X_SYS_CTRL_DDC_BUS_REQ);
 825         if (ret)
 826                 return ret;
 827
 828         timeout = jiffies +
 829                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 830         do {
 831                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 832                                             &status);
 833                 if (ret)
 834                         return ret;
 835         } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 836                  time_before(jiffies, timeout));
 837
 838         if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 839                 dev_err(dev, "Failed to acquire the i2c bus\n");
 840                 return -ETIMEDOUT;
 841         }
 842
 843         return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 844                                       status);
 845 }
 846
 847 /*
 848  * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through
 849  * mode of the HDMI transmitter. Do not use regmap from within this function,
 850  * only use sii902x_*_unlocked functions to read/modify/write registers.
 851  * We are holding the parent adapter lock here, keep this in mind before
 852  * adding more i2c transactions.
 853  *
 854  * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere
 855  * in this driver, we need to make sure that we only touch 0x1A[2:1] from
 856  * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that
 857  * we leave the remaining bits as we have found them.
 858  */
 859 static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id)
 860 {
 861         struct sii902x *sii902x = i2c_mux_priv(mux);
 862         struct device *dev = &sii902x->i2c->dev;
 863         unsigned long timeout;
 864         unsigned int retries;
 865         u8 status;
 866         int ret;
 867
 868         /*
 869          * When the HDMI transmitter is in pass through mode, we need an
 870          * (undocumented) additional delay between STOP and START conditions
 871          * to guarantee the bus won't get stuck.
 872          */
 873         udelay(30);
 874
 875         /*
 876          * Sometimes the I2C bus can stall after failure to use the
 877          * EDID channel. Retry a few times to see if things clear
 878          * up, else continue anyway.
 879          */
 880         retries = 5;
 881         do {
 882                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 883                                             &status);
 884                 retries--;
 885         } while (ret && retries);
 886         if (ret) {
 887                 dev_err(dev, "failed to read status (%d)\n", ret);
 888                 return ret;
 889         }
 890
 891         ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 892                                            SII902X_SYS_CTRL_DDC_BUS_REQ |
 893                                            SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
 894         if (ret)
 895                 return ret;
 896
 897         timeout = jiffies +
 898                   msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
 899         do {
 900                 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA,
 901                                             &status);
 902                 if (ret)
 903                         return ret;
 904         } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
 905                            SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
 906                  time_before(jiffies, timeout));
 907
 908         if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
 909                       SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
 910                 dev_err(dev, "failed to release the i2c bus\n");
 911                 return -ETIMEDOUT;
 912         }
 913
 914         return 0;
 915 }
 916
 917 static const struct drm_bridge_timings default_sii902x_timings = {
 918         .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
 919                  | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
 920                  | DRM_BUS_FLAG_DE_HIGH,
 921 };
 922
 923 static int sii902x_probe(struct i2c_client *client,
 924                          const struct i2c_device_id *id)
 925 {
 926         struct device *dev = &client->dev;
 927         unsigned int status = 0;
 928         struct sii902x *sii902x;
 929         u8 chipid[4];
 930         int ret;
 931
 932         ret = i2c_check_functionality(client->adapter,
 933                                       I2C_FUNC_SMBUS_BYTE_DATA);
 934         if (!ret) {
 935                 dev_err(dev, "I2C adapter not suitable\n");
 936                 return -EIO;
 937         }
 938
 939         sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
 940         if (!sii902x)
 941                 return -ENOMEM;
 942
 943         sii902x->i2c = client;
 944         sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
 945         if (IS_ERR(sii902x->regmap))
 946                 return PTR_ERR(sii902x->regmap);
 947
 948         sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
 949                                                       GPIOD_OUT_LOW);
 950         if (IS_ERR(sii902x->reset_gpio)) {
 951                 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
 952                         PTR_ERR(sii902x->reset_gpio));
 953                 return PTR_ERR(sii902x->reset_gpio);
 954         }
 955
 956         mutex_init(&sii902x->mutex);
 957
 958         sii902x_reset(sii902x);
 959
 960         ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
 961         if (ret)
 962                 return ret;
 963
 964         ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
 965                                &chipid, 4);
 966         if (ret) {
 967                 dev_err(dev, "regmap_read failed %d\n", ret);
 968                 return ret;
 969         }
 970
 971         if (chipid[0] != 0xb0) {
 972                 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
 973                         chipid[0]);
 974                 return -EINVAL;
 975         }
 976
 977         /* Clear all pending interrupts */
 978         regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
 979         regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
 980
 981         if (client->irq > 0) {
 982                 regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
 983                              SII902X_HOTPLUG_EVENT);
 984
 985                 ret = devm_request_threaded_irq(dev, client->irq, NULL,
 986                                                 sii902x_interrupt,
 987                                                 IRQF_ONESHOT, dev_name(dev),
 988                                                 sii902x);
 989                 if (ret)
 990                         return ret;
 991         }
 992
 993         sii902x->bridge.funcs = &sii902x_bridge_funcs;
 994         sii902x->bridge.of_node = dev->of_node;
 995         sii902x->bridge.timings = &default_sii902x_timings;
 996         drm_bridge_add(&sii902x->bridge);
 997
 998         sii902x_audio_codec_init(sii902x, dev);
 999
1000         i2c_set_clientdata(client, sii902x);
1001
1002         sii902x->i2cmux = i2c_mux_alloc(client->adapter, dev,
1003                                         1, 0, I2C_MUX_GATE,
1004                                         sii902x_i2c_bypass_select,
1005                                         sii902x_i2c_bypass_deselect);
1006         if (!sii902x->i2cmux)
1007                 return -ENOMEM;
1008
1009         sii902x->i2cmux->priv = sii902x;
1010         return i2c_mux_add_adapter(sii902x->i2cmux, 0, 0, 0);
1011 }
1012
1013 static int sii902x_remove(struct i2c_client *client)
1014
1015 {
1016         struct sii902x *sii902x = i2c_get_clientdata(client);
1017
1018         i2c_mux_del_adapters(sii902x->i2cmux);
1019         drm_bridge_remove(&sii902x->bridge);
1020
1021         return 0;
1022 }
1023
1024 static const struct of_device_id sii902x_dt_ids[] = {
1025         { .compatible = "sil,sii9022", },
1026         { }
1027 };
1028 MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
1029
1030 static const struct i2c_device_id sii902x_i2c_ids[] = {
1031         { "sii9022", 0 },
1032         { },
1033 };
1034 MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
1035
1036 static struct i2c_driver sii902x_driver = {
1037         .probe = sii902x_probe,
1038         .remove = sii902x_remove,
1039         .driver = {
1040                 .name = "sii902x",
1041                 .of_match_table = sii902x_dt_ids,
1042         },
1043         .id_table = sii902x_i2c_ids,
1044 };
1045 module_i2c_driver(sii902x_driver);
1046
1047 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
1048 MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
1049 MODULE_LICENSE("GPL");