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/media-bus-format.h> 19 #include <linux/module.h> 20 #include <linux/regmap.h> 21 #include <linux/regulator/consumer.h> 22 #include <linux/clk.h> 23 24 #include <drm/drm_atomic_helper.h> 25 #include <drm/drm_bridge.h> 26 #include <drm/drm_drv.h> 27 #include <drm/drm_edid.h> 28 #include <drm/drm_print.h> 29 #include <drm/drm_probe_helper.h> 30 31 #include <sound/hdmi-codec.h> 32 33 #define SII902X_TPI_VIDEO_DATA 0x0 34 35 #define SII902X_TPI_PIXEL_REPETITION 0x8 36 #define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT BIT(5) 37 #define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE BIT(4) 38 #define SII902X_TPI_AVI_PIXEL_REP_4X 3 39 #define SII902X_TPI_AVI_PIXEL_REP_2X 1 40 #define SII902X_TPI_AVI_PIXEL_REP_NONE 0 41 #define SII902X_TPI_CLK_RATIO_HALF (0 << 6) 42 #define SII902X_TPI_CLK_RATIO_1X (1 << 6) 43 #define SII902X_TPI_CLK_RATIO_2X (2 << 6) 44 #define SII902X_TPI_CLK_RATIO_4X (3 << 6) 45 46 #define SII902X_TPI_AVI_IN_FORMAT 0x9 47 #define SII902X_TPI_AVI_INPUT_BITMODE_12BIT BIT(7) 48 #define SII902X_TPI_AVI_INPUT_DITHER BIT(6) 49 #define SII902X_TPI_AVI_INPUT_RANGE_LIMITED (2 << 2) 50 #define SII902X_TPI_AVI_INPUT_RANGE_FULL (1 << 2) 51 #define SII902X_TPI_AVI_INPUT_RANGE_AUTO (0 << 2) 52 #define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK (3 << 0) 53 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0) 54 #define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0) 55 #define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB (0 << 0) 56 57 #define SII902X_TPI_AVI_INFOFRAME 0x0c 58 59 #define SII902X_SYS_CTRL_DATA 0x1a 60 #define SII902X_SYS_CTRL_PWR_DWN BIT(4) 61 #define SII902X_SYS_CTRL_AV_MUTE BIT(3) 62 #define SII902X_SYS_CTRL_DDC_BUS_REQ BIT(2) 63 #define SII902X_SYS_CTRL_DDC_BUS_GRTD BIT(1) 64 #define SII902X_SYS_CTRL_OUTPUT_MODE BIT(0) 65 #define SII902X_SYS_CTRL_OUTPUT_HDMI 1 66 #define SII902X_SYS_CTRL_OUTPUT_DVI 0 67 68 #define SII902X_REG_CHIPID(n) (0x1b + (n)) 69 70 #define SII902X_PWR_STATE_CTRL 0x1e 71 #define SII902X_AVI_POWER_STATE_MSK GENMASK(1, 0) 72 #define SII902X_AVI_POWER_STATE_D(l) ((l) & SII902X_AVI_POWER_STATE_MSK) 73 74 /* Audio */ 75 #define SII902X_TPI_I2S_ENABLE_MAPPING_REG 0x1f 76 #define SII902X_TPI_I2S_CONFIG_FIFO0 (0 << 0) 77 #define SII902X_TPI_I2S_CONFIG_FIFO1 (1 << 0) 78 #define SII902X_TPI_I2S_CONFIG_FIFO2 (2 << 0) 79 #define SII902X_TPI_I2S_CONFIG_FIFO3 (3 << 0) 80 #define SII902X_TPI_I2S_LEFT_RIGHT_SWAP (1 << 2) 81 #define SII902X_TPI_I2S_AUTO_DOWNSAMPLE (1 << 3) 82 #define SII902X_TPI_I2S_SELECT_SD0 (0 << 4) 83 #define SII902X_TPI_I2S_SELECT_SD1 (1 << 4) 84 #define SII902X_TPI_I2S_SELECT_SD2 (2 << 4) 85 #define SII902X_TPI_I2S_SELECT_SD3 (3 << 4) 86 #define SII902X_TPI_I2S_FIFO_ENABLE (1 << 7) 87 88 #define SII902X_TPI_I2S_INPUT_CONFIG_REG 0x20 89 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES (0 << 0) 90 #define SII902X_TPI_I2S_FIRST_BIT_SHIFT_NO (1 << 0) 91 #define SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST (0 << 1) 92 #define SII902X_TPI_I2S_SD_DIRECTION_LSB_FIRST (1 << 1) 93 #define SII902X_TPI_I2S_SD_JUSTIFY_LEFT (0 << 2) 94 #define SII902X_TPI_I2S_SD_JUSTIFY_RIGHT (1 << 2) 95 #define SII902X_TPI_I2S_WS_POLARITY_LOW (0 << 3) 96 #define SII902X_TPI_I2S_WS_POLARITY_HIGH (1 << 3) 97 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_128 (0 << 4) 98 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_256 (1 << 4) 99 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_384 (2 << 4) 100 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_512 (3 << 4) 101 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_768 (4 << 4) 102 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1024 (5 << 4) 103 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_1152 (6 << 4) 104 #define SII902X_TPI_I2S_MCLK_MULTIPLIER_192 (7 << 4) 105 #define SII902X_TPI_I2S_SCK_EDGE_FALLING (0 << 7) 106 #define SII902X_TPI_I2S_SCK_EDGE_RISING (1 << 7) 107 108 #define SII902X_TPI_I2S_STRM_HDR_BASE 0x21 109 #define SII902X_TPI_I2S_STRM_HDR_SIZE 5 110 111 #define SII902X_TPI_AUDIO_CONFIG_BYTE2_REG 0x26 112 #define SII902X_TPI_AUDIO_CODING_STREAM_HEADER (0 << 0) 113 #define SII902X_TPI_AUDIO_CODING_PCM (1 << 0) 114 #define SII902X_TPI_AUDIO_CODING_AC3 (2 << 0) 115 #define SII902X_TPI_AUDIO_CODING_MPEG1 (3 << 0) 116 #define SII902X_TPI_AUDIO_CODING_MP3 (4 << 0) 117 #define SII902X_TPI_AUDIO_CODING_MPEG2 (5 << 0) 118 #define SII902X_TPI_AUDIO_CODING_AAC (6 << 0) 119 #define SII902X_TPI_AUDIO_CODING_DTS (7 << 0) 120 #define SII902X_TPI_AUDIO_CODING_ATRAC (8 << 0) 121 #define SII902X_TPI_AUDIO_MUTE_DISABLE (0 << 4) 122 #define SII902X_TPI_AUDIO_MUTE_ENABLE (1 << 4) 123 #define SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS (0 << 5) 124 #define SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS (1 << 5) 125 #define SII902X_TPI_AUDIO_INTERFACE_DISABLE (0 << 6) 126 #define SII902X_TPI_AUDIO_INTERFACE_SPDIF (1 << 6) 127 #define SII902X_TPI_AUDIO_INTERFACE_I2S (2 << 6) 128 129 #define SII902X_TPI_AUDIO_CONFIG_BYTE3_REG 0x27 130 #define SII902X_TPI_AUDIO_FREQ_STREAM (0 << 3) 131 #define SII902X_TPI_AUDIO_FREQ_32KHZ (1 << 3) 132 #define SII902X_TPI_AUDIO_FREQ_44KHZ (2 << 3) 133 #define SII902X_TPI_AUDIO_FREQ_48KHZ (3 << 3) 134 #define SII902X_TPI_AUDIO_FREQ_88KHZ (4 << 3) 135 #define SII902X_TPI_AUDIO_FREQ_96KHZ (5 << 3) 136 #define SII902X_TPI_AUDIO_FREQ_176KHZ (6 << 3) 137 #define SII902X_TPI_AUDIO_FREQ_192KHZ (7 << 3) 138 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_STREAM (0 << 6) 139 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_16 (1 << 6) 140 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_20 (2 << 6) 141 #define SII902X_TPI_AUDIO_SAMPLE_SIZE_24 (3 << 6) 142 143 #define SII902X_TPI_AUDIO_CONFIG_BYTE4_REG 0x28 144 145 #define SII902X_INT_ENABLE 0x3c 146 #define SII902X_INT_STATUS 0x3d 147 #define SII902X_HOTPLUG_EVENT BIT(0) 148 #define SII902X_PLUGGED_STATUS BIT(2) 149 150 #define SII902X_REG_TPI_RQB 0xc7 151 152 /* Indirect internal register access */ 153 #define SII902X_IND_SET_PAGE 0xbc 154 #define SII902X_IND_OFFSET 0xbd 155 #define SII902X_IND_VALUE 0xbe 156 157 #define SII902X_TPI_MISC_INFOFRAME_BASE 0xbf 158 #define SII902X_TPI_MISC_INFOFRAME_END 0xde 159 #define SII902X_TPI_MISC_INFOFRAME_SIZE \ 160 (SII902X_TPI_MISC_INFOFRAME_END - SII902X_TPI_MISC_INFOFRAME_BASE) 161 162 #define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS 500 163 164 #define SII902X_AUDIO_PORT_INDEX 3 165 166 struct sii902x { 167 struct i2c_client *i2c; 168 struct regmap *regmap; 169 struct drm_bridge bridge; 170 struct drm_bridge *next_bridge; 171 struct drm_connector connector; 172 struct gpio_desc *reset_gpio; 173 struct i2c_mux_core *i2cmux; 174 bool sink_is_hdmi; 175 /* 176 * Mutex protects audio and video functions from interfering 177 * each other, by keeping their i2c command sequences atomic. 178 */ 179 struct mutex mutex; 180 struct sii902x_audio { 181 struct platform_device *pdev; 182 struct clk *mclk; 183 u32 i2s_fifo_sequence[4]; 184 } audio; 185 }; 186 187 static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val) 188 { 189 union i2c_smbus_data data; 190 int ret; 191 192 ret = __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags, 193 I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data); 194 195 if (ret < 0) 196 return ret; 197 198 *val = data.byte; 199 return 0; 200 } 201 202 static int sii902x_write_unlocked(struct i2c_client *i2c, u8 reg, u8 val) 203 { 204 union i2c_smbus_data data; 205 206 data.byte = val; 207 208 return __i2c_smbus_xfer(i2c->adapter, i2c->addr, i2c->flags, 209 I2C_SMBUS_WRITE, reg, I2C_SMBUS_BYTE_DATA, 210 &data); 211 } 212 213 static int sii902x_update_bits_unlocked(struct i2c_client *i2c, u8 reg, u8 mask, 214 u8 val) 215 { 216 int ret; 217 u8 status; 218 219 ret = sii902x_read_unlocked(i2c, reg, &status); 220 if (ret) 221 return ret; 222 status &= ~mask; 223 status |= val & mask; 224 return sii902x_write_unlocked(i2c, reg, status); 225 } 226 227 static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge) 228 { 229 return container_of(bridge, struct sii902x, bridge); 230 } 231 232 static inline struct sii902x *connector_to_sii902x(struct drm_connector *con) 233 { 234 return container_of(con, struct sii902x, connector); 235 } 236 237 static void sii902x_reset(struct sii902x *sii902x) 238 { 239 if (!sii902x->reset_gpio) 240 return; 241 242 gpiod_set_value_cansleep(sii902x->reset_gpio, 1); 243 244 /* The datasheet says treset-min = 100us. Make it 150us to be sure. */ 245 usleep_range(150, 200); 246 247 gpiod_set_value_cansleep(sii902x->reset_gpio, 0); 248 } 249 250 static enum drm_connector_status sii902x_detect(struct sii902x *sii902x) 251 { 252 unsigned int status; 253 254 mutex_lock(&sii902x->mutex); 255 256 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status); 257 258 mutex_unlock(&sii902x->mutex); 259 260 return (status & SII902X_PLUGGED_STATUS) ? 261 connector_status_connected : connector_status_disconnected; 262 } 263 264 static enum drm_connector_status 265 sii902x_connector_detect(struct drm_connector *connector, bool force) 266 { 267 struct sii902x *sii902x = connector_to_sii902x(connector); 268 269 return sii902x_detect(sii902x); 270 } 271 272 static const struct drm_connector_funcs sii902x_connector_funcs = { 273 .detect = sii902x_connector_detect, 274 .fill_modes = drm_helper_probe_single_connector_modes, 275 .destroy = drm_connector_cleanup, 276 .reset = drm_atomic_helper_connector_reset, 277 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 278 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 279 }; 280 281 static struct edid *sii902x_get_edid(struct sii902x *sii902x, 282 struct drm_connector *connector) 283 { 284 struct edid *edid; 285 286 mutex_lock(&sii902x->mutex); 287 288 edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]); 289 if (edid) { 290 if (drm_detect_hdmi_monitor(edid)) 291 sii902x->sink_is_hdmi = true; 292 else 293 sii902x->sink_is_hdmi = false; 294 } 295 296 mutex_unlock(&sii902x->mutex); 297 298 return edid; 299 } 300 301 static int sii902x_get_modes(struct drm_connector *connector) 302 { 303 struct sii902x *sii902x = connector_to_sii902x(connector); 304 struct edid *edid; 305 int num = 0; 306 307 edid = sii902x_get_edid(sii902x, connector); 308 drm_connector_update_edid_property(connector, edid); 309 if (edid) { 310 num = drm_add_edid_modes(connector, edid); 311 kfree(edid); 312 } 313 314 return num; 315 } 316 317 static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector, 318 struct drm_display_mode *mode) 319 { 320 /* TODO: check mode */ 321 322 return MODE_OK; 323 } 324 325 static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = { 326 .get_modes = sii902x_get_modes, 327 .mode_valid = sii902x_mode_valid, 328 }; 329 330 static void sii902x_bridge_disable(struct drm_bridge *bridge) 331 { 332 struct sii902x *sii902x = bridge_to_sii902x(bridge); 333 334 mutex_lock(&sii902x->mutex); 335 336 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA, 337 SII902X_SYS_CTRL_PWR_DWN, 338 SII902X_SYS_CTRL_PWR_DWN); 339 340 mutex_unlock(&sii902x->mutex); 341 } 342 343 static void sii902x_bridge_enable(struct drm_bridge *bridge) 344 { 345 struct sii902x *sii902x = bridge_to_sii902x(bridge); 346 347 mutex_lock(&sii902x->mutex); 348 349 regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL, 350 SII902X_AVI_POWER_STATE_MSK, 351 SII902X_AVI_POWER_STATE_D(0)); 352 regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA, 353 SII902X_SYS_CTRL_PWR_DWN, 0); 354 355 mutex_unlock(&sii902x->mutex); 356 } 357 358 static void sii902x_bridge_mode_set(struct drm_bridge *bridge, 359 const struct drm_display_mode *mode, 360 const struct drm_display_mode *adj) 361 { 362 struct sii902x *sii902x = bridge_to_sii902x(bridge); 363 u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI; 364 struct regmap *regmap = sii902x->regmap; 365 u8 buf[HDMI_INFOFRAME_SIZE(AVI)]; 366 struct hdmi_avi_infoframe frame; 367 u16 pixel_clock_10kHz = adj->clock / 10; 368 int ret; 369 370 if (sii902x->sink_is_hdmi) 371 output_mode = SII902X_SYS_CTRL_OUTPUT_HDMI; 372 373 buf[0] = pixel_clock_10kHz & 0xff; 374 buf[1] = pixel_clock_10kHz >> 8; 375 buf[2] = drm_mode_vrefresh(adj); 376 buf[3] = 0x00; 377 buf[4] = adj->hdisplay; 378 buf[5] = adj->hdisplay >> 8; 379 buf[6] = adj->vdisplay; 380 buf[7] = adj->vdisplay >> 8; 381 buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE | 382 SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT; 383 buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO | 384 SII902X_TPI_AVI_INPUT_COLORSPACE_RGB; 385 386 mutex_lock(&sii902x->mutex); 387 388 ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA, 389 SII902X_SYS_CTRL_OUTPUT_MODE, output_mode); 390 if (ret) 391 goto out; 392 393 ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10); 394 if (ret) 395 goto out; 396 397 ret = drm_hdmi_avi_infoframe_from_display_mode(&frame, 398 &sii902x->connector, adj); 399 if (ret < 0) { 400 DRM_ERROR("couldn't fill AVI infoframe\n"); 401 goto out; 402 } 403 404 ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf)); 405 if (ret < 0) { 406 DRM_ERROR("failed to pack AVI infoframe: %d\n", ret); 407 goto out; 408 } 409 410 /* Do not send the infoframe header, but keep the CRC field. */ 411 regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME, 412 buf + HDMI_INFOFRAME_HEADER_SIZE - 1, 413 HDMI_AVI_INFOFRAME_SIZE + 1); 414 415 out: 416 mutex_unlock(&sii902x->mutex); 417 } 418 419 static int sii902x_bridge_attach(struct drm_bridge *bridge, 420 enum drm_bridge_attach_flags flags) 421 { 422 struct sii902x *sii902x = bridge_to_sii902x(bridge); 423 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 424 struct drm_device *drm = bridge->dev; 425 int ret; 426 427 if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) 428 return drm_bridge_attach(bridge->encoder, sii902x->next_bridge, 429 bridge, flags); 430 431 drm_connector_helper_add(&sii902x->connector, 432 &sii902x_connector_helper_funcs); 433 434 if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) { 435 dev_err(&sii902x->i2c->dev, 436 "sii902x driver is only compatible with DRM devices supporting atomic updates\n"); 437 return -ENOTSUPP; 438 } 439 440 ret = drm_connector_init(drm, &sii902x->connector, 441 &sii902x_connector_funcs, 442 DRM_MODE_CONNECTOR_HDMIA); 443 if (ret) 444 return ret; 445 446 if (sii902x->i2c->irq > 0) 447 sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD; 448 else 449 sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT; 450 451 ret = drm_display_info_set_bus_formats(&sii902x->connector.display_info, 452 &bus_format, 1); 453 if (ret) 454 return ret; 455 456 drm_connector_attach_encoder(&sii902x->connector, bridge->encoder); 457 458 return 0; 459 } 460 461 static enum drm_connector_status sii902x_bridge_detect(struct drm_bridge *bridge) 462 { 463 struct sii902x *sii902x = bridge_to_sii902x(bridge); 464 465 return sii902x_detect(sii902x); 466 } 467 468 static struct edid *sii902x_bridge_get_edid(struct drm_bridge *bridge, 469 struct drm_connector *connector) 470 { 471 struct sii902x *sii902x = bridge_to_sii902x(bridge); 472 473 return sii902x_get_edid(sii902x, connector); 474 } 475 476 static u32 *sii902x_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge, 477 struct drm_bridge_state *bridge_state, 478 struct drm_crtc_state *crtc_state, 479 struct drm_connector_state *conn_state, 480 u32 output_fmt, 481 unsigned int *num_input_fmts) 482 { 483 u32 *input_fmts; 484 485 *num_input_fmts = 0; 486 487 input_fmts = kcalloc(1, sizeof(*input_fmts), GFP_KERNEL); 488 if (!input_fmts) 489 return NULL; 490 491 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24; 492 *num_input_fmts = 1; 493 494 return input_fmts; 495 } 496 497 static int sii902x_bridge_atomic_check(struct drm_bridge *bridge, 498 struct drm_bridge_state *bridge_state, 499 struct drm_crtc_state *crtc_state, 500 struct drm_connector_state *conn_state) 501 { 502 /* 503 * There might be flags negotiation supported in future but 504 * set the bus flags in atomic_check statically for now. 505 */ 506 bridge_state->input_bus_cfg.flags = bridge->timings->input_bus_flags; 507 508 return 0; 509 } 510 511 static const struct drm_bridge_funcs sii902x_bridge_funcs = { 512 .attach = sii902x_bridge_attach, 513 .mode_set = sii902x_bridge_mode_set, 514 .disable = sii902x_bridge_disable, 515 .enable = sii902x_bridge_enable, 516 .detect = sii902x_bridge_detect, 517 .get_edid = sii902x_bridge_get_edid, 518 .atomic_reset = drm_atomic_helper_bridge_reset, 519 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, 520 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, 521 .atomic_get_input_bus_fmts = sii902x_bridge_atomic_get_input_bus_fmts, 522 .atomic_check = sii902x_bridge_atomic_check, 523 }; 524 525 static int sii902x_mute(struct sii902x *sii902x, bool mute) 526 { 527 struct device *dev = &sii902x->i2c->dev; 528 unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE : 529 SII902X_TPI_AUDIO_MUTE_DISABLE; 530 531 dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted"); 532 533 return regmap_update_bits(sii902x->regmap, 534 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG, 535 SII902X_TPI_AUDIO_MUTE_ENABLE, val); 536 } 537 538 static const int sii902x_mclk_div_table[] = { 539 128, 256, 384, 512, 768, 1024, 1152, 192 }; 540 541 static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate, 542 unsigned int mclk) 543 { 544 int div = mclk / rate; 545 int distance = 100000; 546 u8 i, nearest = 0; 547 548 for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) { 549 unsigned int d = abs(div - sii902x_mclk_div_table[i]); 550 551 if (d >= distance) 552 continue; 553 554 nearest = i; 555 distance = d; 556 if (d == 0) 557 break; 558 } 559 560 *i2s_config_reg |= nearest << 4; 561 562 return sii902x_mclk_div_table[nearest]; 563 } 564 565 static const struct sii902x_sample_freq { 566 u32 freq; 567 u8 val; 568 } sii902x_sample_freq[] = { 569 { .freq = 32000, .val = SII902X_TPI_AUDIO_FREQ_32KHZ }, 570 { .freq = 44000, .val = SII902X_TPI_AUDIO_FREQ_44KHZ }, 571 { .freq = 48000, .val = SII902X_TPI_AUDIO_FREQ_48KHZ }, 572 { .freq = 88000, .val = SII902X_TPI_AUDIO_FREQ_88KHZ }, 573 { .freq = 96000, .val = SII902X_TPI_AUDIO_FREQ_96KHZ }, 574 { .freq = 176000, .val = SII902X_TPI_AUDIO_FREQ_176KHZ }, 575 { .freq = 192000, .val = SII902X_TPI_AUDIO_FREQ_192KHZ }, 576 }; 577 578 static int sii902x_audio_hw_params(struct device *dev, void *data, 579 struct hdmi_codec_daifmt *daifmt, 580 struct hdmi_codec_params *params) 581 { 582 struct sii902x *sii902x = dev_get_drvdata(dev); 583 u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST; 584 u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S | 585 SII902X_TPI_AUDIO_MUTE_ENABLE | 586 SII902X_TPI_AUDIO_CODING_PCM); 587 u8 config_byte3_reg = 0; 588 u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)]; 589 unsigned long mclk_rate; 590 int i, ret; 591 592 if (daifmt->bit_clk_provider || daifmt->frame_clk_provider) { 593 dev_dbg(dev, "%s: I2S clock provider mode not supported\n", 594 __func__); 595 return -EINVAL; 596 } 597 598 switch (daifmt->fmt) { 599 case HDMI_I2S: 600 i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES | 601 SII902X_TPI_I2S_SD_JUSTIFY_LEFT; 602 break; 603 case HDMI_RIGHT_J: 604 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT; 605 break; 606 case HDMI_LEFT_J: 607 i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT; 608 break; 609 default: 610 dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__, 611 daifmt->fmt); 612 return -EINVAL; 613 } 614 615 if (daifmt->bit_clk_inv) 616 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING; 617 else 618 i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING; 619 620 if (daifmt->frame_clk_inv) 621 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW; 622 else 623 i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH; 624 625 if (params->channels > 2) 626 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS; 627 else 628 config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS; 629 630 switch (params->sample_width) { 631 case 16: 632 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16; 633 break; 634 case 20: 635 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20; 636 break; 637 case 24: 638 case 32: 639 config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24; 640 break; 641 default: 642 dev_err(dev, "%s: Unsupported sample width %u\n", __func__, 643 params->sample_width); 644 return -EINVAL; 645 } 646 647 for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) { 648 if (params->sample_rate == sii902x_sample_freq[i].freq) { 649 config_byte3_reg |= sii902x_sample_freq[i].val; 650 break; 651 } 652 } 653 654 ret = clk_prepare_enable(sii902x->audio.mclk); 655 if (ret) { 656 dev_err(dev, "Enabling mclk failed: %d\n", ret); 657 return ret; 658 } 659 660 if (sii902x->audio.mclk) { 661 mclk_rate = clk_get_rate(sii902x->audio.mclk); 662 ret = sii902x_select_mclk_div(&i2s_config_reg, 663 params->sample_rate, mclk_rate); 664 if (mclk_rate != ret * params->sample_rate) 665 dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n", 666 mclk_rate, ret, params->sample_rate); 667 } 668 669 mutex_lock(&sii902x->mutex); 670 671 ret = regmap_write(sii902x->regmap, 672 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG, 673 config_byte2_reg); 674 if (ret < 0) 675 goto out; 676 677 ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG, 678 i2s_config_reg); 679 if (ret) 680 goto out; 681 682 for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence) && 683 sii902x->audio.i2s_fifo_sequence[i]; i++) 684 regmap_write(sii902x->regmap, 685 SII902X_TPI_I2S_ENABLE_MAPPING_REG, 686 sii902x->audio.i2s_fifo_sequence[i]); 687 688 ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG, 689 config_byte3_reg); 690 if (ret) 691 goto out; 692 693 ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE, 694 params->iec.status, 695 min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE, 696 sizeof(params->iec.status))); 697 if (ret) 698 goto out; 699 700 ret = hdmi_audio_infoframe_pack(¶ms->cea, infoframe_buf, 701 sizeof(infoframe_buf)); 702 if (ret < 0) { 703 dev_err(dev, "%s: Failed to pack audio infoframe: %d\n", 704 __func__, ret); 705 goto out; 706 } 707 708 ret = regmap_bulk_write(sii902x->regmap, 709 SII902X_TPI_MISC_INFOFRAME_BASE, 710 infoframe_buf, 711 min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE)); 712 if (ret) 713 goto out; 714 715 /* Decode Level 0 Packets */ 716 ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02); 717 if (ret) 718 goto out; 719 720 ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24); 721 if (ret) 722 goto out; 723 724 ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02); 725 if (ret) 726 goto out; 727 728 dev_dbg(dev, "%s: hdmi audio enabled\n", __func__); 729 out: 730 mutex_unlock(&sii902x->mutex); 731 732 if (ret) { 733 clk_disable_unprepare(sii902x->audio.mclk); 734 dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__, 735 ret); 736 } 737 738 return ret; 739 } 740 741 static void sii902x_audio_shutdown(struct device *dev, void *data) 742 { 743 struct sii902x *sii902x = dev_get_drvdata(dev); 744 745 mutex_lock(&sii902x->mutex); 746 747 regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG, 748 SII902X_TPI_AUDIO_INTERFACE_DISABLE); 749 750 mutex_unlock(&sii902x->mutex); 751 752 clk_disable_unprepare(sii902x->audio.mclk); 753 } 754 755 static int sii902x_audio_mute(struct device *dev, void *data, 756 bool enable, int direction) 757 { 758 struct sii902x *sii902x = dev_get_drvdata(dev); 759 760 mutex_lock(&sii902x->mutex); 761 762 sii902x_mute(sii902x, enable); 763 764 mutex_unlock(&sii902x->mutex); 765 766 return 0; 767 } 768 769 static int sii902x_audio_get_eld(struct device *dev, void *data, 770 uint8_t *buf, size_t len) 771 { 772 struct sii902x *sii902x = dev_get_drvdata(dev); 773 774 mutex_lock(&sii902x->mutex); 775 776 memcpy(buf, sii902x->connector.eld, 777 min(sizeof(sii902x->connector.eld), len)); 778 779 mutex_unlock(&sii902x->mutex); 780 781 return 0; 782 } 783 784 static int sii902x_audio_get_dai_id(struct snd_soc_component *component, 785 struct device_node *endpoint) 786 { 787 struct of_endpoint of_ep; 788 int ret; 789 790 ret = of_graph_parse_endpoint(endpoint, &of_ep); 791 if (ret < 0) 792 return ret; 793 794 /* 795 * HDMI sound should be located at reg = <3> 796 * Return expected DAI index 0. 797 */ 798 if (of_ep.port == SII902X_AUDIO_PORT_INDEX) 799 return 0; 800 801 return -EINVAL; 802 } 803 804 static const struct hdmi_codec_ops sii902x_audio_codec_ops = { 805 .hw_params = sii902x_audio_hw_params, 806 .audio_shutdown = sii902x_audio_shutdown, 807 .mute_stream = sii902x_audio_mute, 808 .get_eld = sii902x_audio_get_eld, 809 .get_dai_id = sii902x_audio_get_dai_id, 810 .no_capture_mute = 1, 811 }; 812 813 static int sii902x_audio_codec_init(struct sii902x *sii902x, 814 struct device *dev) 815 { 816 static const u8 audio_fifo_id[] = { 817 SII902X_TPI_I2S_CONFIG_FIFO0, 818 SII902X_TPI_I2S_CONFIG_FIFO1, 819 SII902X_TPI_I2S_CONFIG_FIFO2, 820 SII902X_TPI_I2S_CONFIG_FIFO3, 821 }; 822 static const u8 i2s_lane_id[] = { 823 SII902X_TPI_I2S_SELECT_SD0, 824 SII902X_TPI_I2S_SELECT_SD1, 825 SII902X_TPI_I2S_SELECT_SD2, 826 SII902X_TPI_I2S_SELECT_SD3, 827 }; 828 struct hdmi_codec_pdata codec_data = { 829 .ops = &sii902x_audio_codec_ops, 830 .i2s = 1, /* Only i2s support for now. */ 831 .spdif = 0, 832 .max_i2s_channels = 0, 833 }; 834 u8 lanes[4]; 835 int num_lanes, i; 836 837 if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) { 838 dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n", 839 __func__); 840 return 0; 841 } 842 843 num_lanes = of_property_read_variable_u8_array(dev->of_node, 844 "sil,i2s-data-lanes", 845 lanes, 1, 846 ARRAY_SIZE(lanes)); 847 848 if (num_lanes == -EINVAL) { 849 dev_dbg(dev, 850 "%s: No \"sil,i2s-data-lanes\", use default <0>\n", 851 __func__); 852 num_lanes = 1; 853 lanes[0] = 0; 854 } else if (num_lanes < 0) { 855 dev_err(dev, 856 "%s: Error gettin \"sil,i2s-data-lanes\": %d\n", 857 __func__, num_lanes); 858 return num_lanes; 859 } 860 codec_data.max_i2s_channels = 2 * num_lanes; 861 862 for (i = 0; i < num_lanes; i++) 863 sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] | 864 i2s_lane_id[lanes[i]] | SII902X_TPI_I2S_FIFO_ENABLE; 865 866 sii902x->audio.mclk = devm_clk_get_optional(dev, "mclk"); 867 if (IS_ERR(sii902x->audio.mclk)) { 868 dev_err(dev, "%s: No clock (audio mclk) found: %ld\n", 869 __func__, PTR_ERR(sii902x->audio.mclk)); 870 return PTR_ERR(sii902x->audio.mclk); 871 } 872 873 sii902x->audio.pdev = platform_device_register_data( 874 dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO, 875 &codec_data, sizeof(codec_data)); 876 877 return PTR_ERR_OR_ZERO(sii902x->audio.pdev); 878 } 879 880 static const struct regmap_range sii902x_volatile_ranges[] = { 881 { .range_min = 0, .range_max = 0xff }, 882 }; 883 884 static const struct regmap_access_table sii902x_volatile_table = { 885 .yes_ranges = sii902x_volatile_ranges, 886 .n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges), 887 }; 888 889 static const struct regmap_config sii902x_regmap_config = { 890 .reg_bits = 8, 891 .val_bits = 8, 892 .disable_locking = true, /* struct sii902x mutex should be enough */ 893 .max_register = SII902X_TPI_MISC_INFOFRAME_END, 894 .volatile_table = &sii902x_volatile_table, 895 .cache_type = REGCACHE_NONE, 896 }; 897 898 static irqreturn_t sii902x_interrupt(int irq, void *data) 899 { 900 struct sii902x *sii902x = data; 901 unsigned int status = 0; 902 903 mutex_lock(&sii902x->mutex); 904 905 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status); 906 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status); 907 908 mutex_unlock(&sii902x->mutex); 909 910 if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev) { 911 drm_helper_hpd_irq_event(sii902x->bridge.dev); 912 drm_bridge_hpd_notify(&sii902x->bridge, (status & SII902X_PLUGGED_STATUS) 913 ? connector_status_connected 914 : connector_status_disconnected); 915 } 916 917 return IRQ_HANDLED; 918 } 919 920 /* 921 * The purpose of sii902x_i2c_bypass_select is to enable the pass through 922 * mode of the HDMI transmitter. Do not use regmap from within this function, 923 * only use sii902x_*_unlocked functions to read/modify/write registers. 924 * We are holding the parent adapter lock here, keep this in mind before 925 * adding more i2c transactions. 926 * 927 * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere 928 * in this driver, we need to make sure that we only touch 0x1A[2:1] from 929 * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that 930 * we leave the remaining bits as we have found them. 931 */ 932 static int sii902x_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id) 933 { 934 struct sii902x *sii902x = i2c_mux_priv(mux); 935 struct device *dev = &sii902x->i2c->dev; 936 unsigned long timeout; 937 u8 status; 938 int ret; 939 940 ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, 941 SII902X_SYS_CTRL_DDC_BUS_REQ, 942 SII902X_SYS_CTRL_DDC_BUS_REQ); 943 if (ret) 944 return ret; 945 946 timeout = jiffies + 947 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS); 948 do { 949 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, 950 &status); 951 if (ret) 952 return ret; 953 } while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) && 954 time_before(jiffies, timeout)); 955 956 if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) { 957 dev_err(dev, "Failed to acquire the i2c bus\n"); 958 return -ETIMEDOUT; 959 } 960 961 return sii902x_write_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, 962 status); 963 } 964 965 /* 966 * The purpose of sii902x_i2c_bypass_deselect is to disable the pass through 967 * mode of the HDMI transmitter. Do not use regmap from within this function, 968 * only use sii902x_*_unlocked functions to read/modify/write registers. 969 * We are holding the parent adapter lock here, keep this in mind before 970 * adding more i2c transactions. 971 * 972 * Also, since SII902X_SYS_CTRL_DATA is used with regmap_update_bits elsewhere 973 * in this driver, we need to make sure that we only touch 0x1A[2:1] from 974 * within sii902x_i2c_bypass_select and sii902x_i2c_bypass_deselect, and that 975 * we leave the remaining bits as we have found them. 976 */ 977 static int sii902x_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id) 978 { 979 struct sii902x *sii902x = i2c_mux_priv(mux); 980 struct device *dev = &sii902x->i2c->dev; 981 unsigned long timeout; 982 unsigned int retries; 983 u8 status; 984 int ret; 985 986 /* 987 * When the HDMI transmitter is in pass through mode, we need an 988 * (undocumented) additional delay between STOP and START conditions 989 * to guarantee the bus won't get stuck. 990 */ 991 udelay(30); 992 993 /* 994 * Sometimes the I2C bus can stall after failure to use the 995 * EDID channel. Retry a few times to see if things clear 996 * up, else continue anyway. 997 */ 998 retries = 5; 999 do { 1000 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, 1001 &status); 1002 retries--; 1003 } while (ret && retries); 1004 if (ret) { 1005 dev_err(dev, "failed to read status (%d)\n", ret); 1006 return ret; 1007 } 1008 1009 ret = sii902x_update_bits_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, 1010 SII902X_SYS_CTRL_DDC_BUS_REQ | 1011 SII902X_SYS_CTRL_DDC_BUS_GRTD, 0); 1012 if (ret) 1013 return ret; 1014 1015 timeout = jiffies + 1016 msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS); 1017 do { 1018 ret = sii902x_read_unlocked(sii902x->i2c, SII902X_SYS_CTRL_DATA, 1019 &status); 1020 if (ret) 1021 return ret; 1022 } while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ | 1023 SII902X_SYS_CTRL_DDC_BUS_GRTD) && 1024 time_before(jiffies, timeout)); 1025 1026 if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ | 1027 SII902X_SYS_CTRL_DDC_BUS_GRTD)) { 1028 dev_err(dev, "failed to release the i2c bus\n"); 1029 return -ETIMEDOUT; 1030 } 1031 1032 return 0; 1033 } 1034 1035 static const struct drm_bridge_timings default_sii902x_timings = { 1036 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE 1037 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE 1038 | DRM_BUS_FLAG_DE_HIGH, 1039 }; 1040 1041 static int sii902x_init(struct sii902x *sii902x) 1042 { 1043 struct device *dev = &sii902x->i2c->dev; 1044 unsigned int status = 0; 1045 u8 chipid[4]; 1046 int ret; 1047 1048 sii902x_reset(sii902x); 1049 1050 ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0); 1051 if (ret) 1052 return ret; 1053 1054 ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0), 1055 &chipid, 4); 1056 if (ret) { 1057 dev_err(dev, "regmap_read failed %d\n", ret); 1058 return ret; 1059 } 1060 1061 if (chipid[0] != 0xb0) { 1062 dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n", 1063 chipid[0]); 1064 return -EINVAL; 1065 } 1066 1067 /* Clear all pending interrupts */ 1068 regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status); 1069 regmap_write(sii902x->regmap, SII902X_INT_STATUS, status); 1070 1071 if (sii902x->i2c->irq > 0) { 1072 regmap_write(sii902x->regmap, SII902X_INT_ENABLE, 1073 SII902X_HOTPLUG_EVENT); 1074 1075 ret = devm_request_threaded_irq(dev, sii902x->i2c->irq, NULL, 1076 sii902x_interrupt, 1077 IRQF_ONESHOT, dev_name(dev), 1078 sii902x); 1079 if (ret) 1080 return ret; 1081 } 1082 1083 sii902x->bridge.funcs = &sii902x_bridge_funcs; 1084 sii902x->bridge.of_node = dev->of_node; 1085 sii902x->bridge.timings = &default_sii902x_timings; 1086 sii902x->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID; 1087 1088 if (sii902x->i2c->irq > 0) 1089 sii902x->bridge.ops |= DRM_BRIDGE_OP_HPD; 1090 1091 drm_bridge_add(&sii902x->bridge); 1092 1093 sii902x_audio_codec_init(sii902x, dev); 1094 1095 i2c_set_clientdata(sii902x->i2c, sii902x); 1096 1097 sii902x->i2cmux = i2c_mux_alloc(sii902x->i2c->adapter, dev, 1098 1, 0, I2C_MUX_GATE, 1099 sii902x_i2c_bypass_select, 1100 sii902x_i2c_bypass_deselect); 1101 if (!sii902x->i2cmux) 1102 return -ENOMEM; 1103 1104 sii902x->i2cmux->priv = sii902x; 1105 return i2c_mux_add_adapter(sii902x->i2cmux, 0, 0, 0); 1106 } 1107 1108 static int sii902x_probe(struct i2c_client *client) 1109 { 1110 struct device *dev = &client->dev; 1111 struct device_node *endpoint; 1112 struct sii902x *sii902x; 1113 static const char * const supplies[] = {"iovcc", "cvcc12"}; 1114 int ret; 1115 1116 ret = i2c_check_functionality(client->adapter, 1117 I2C_FUNC_SMBUS_BYTE_DATA); 1118 if (!ret) { 1119 dev_err(dev, "I2C adapter not suitable\n"); 1120 return -EIO; 1121 } 1122 1123 sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL); 1124 if (!sii902x) 1125 return -ENOMEM; 1126 1127 sii902x->i2c = client; 1128 sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config); 1129 if (IS_ERR(sii902x->regmap)) 1130 return PTR_ERR(sii902x->regmap); 1131 1132 sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset", 1133 GPIOD_OUT_LOW); 1134 if (IS_ERR(sii902x->reset_gpio)) { 1135 dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n", 1136 PTR_ERR(sii902x->reset_gpio)); 1137 return PTR_ERR(sii902x->reset_gpio); 1138 } 1139 1140 endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1); 1141 if (endpoint) { 1142 struct device_node *remote = of_graph_get_remote_port_parent(endpoint); 1143 1144 of_node_put(endpoint); 1145 if (!remote) { 1146 dev_err(dev, "Endpoint in port@1 unconnected\n"); 1147 return -ENODEV; 1148 } 1149 1150 if (!of_device_is_available(remote)) { 1151 dev_err(dev, "port@1 remote device is disabled\n"); 1152 of_node_put(remote); 1153 return -ENODEV; 1154 } 1155 1156 sii902x->next_bridge = of_drm_find_bridge(remote); 1157 of_node_put(remote); 1158 if (!sii902x->next_bridge) 1159 return dev_err_probe(dev, -EPROBE_DEFER, 1160 "Failed to find remote bridge\n"); 1161 } 1162 1163 mutex_init(&sii902x->mutex); 1164 1165 ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(supplies), supplies); 1166 if (ret < 0) 1167 return dev_err_probe(dev, ret, "Failed to enable supplies"); 1168 1169 return sii902x_init(sii902x); 1170 } 1171 1172 static void sii902x_remove(struct i2c_client *client) 1173 1174 { 1175 struct sii902x *sii902x = i2c_get_clientdata(client); 1176 1177 i2c_mux_del_adapters(sii902x->i2cmux); 1178 drm_bridge_remove(&sii902x->bridge); 1179 } 1180 1181 static const struct of_device_id sii902x_dt_ids[] = { 1182 { .compatible = "sil,sii9022", }, 1183 { } 1184 }; 1185 MODULE_DEVICE_TABLE(of, sii902x_dt_ids); 1186 1187 static const struct i2c_device_id sii902x_i2c_ids[] = { 1188 { "sii9022", 0 }, 1189 { }, 1190 }; 1191 MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids); 1192 1193 static struct i2c_driver sii902x_driver = { 1194 .probe = sii902x_probe, 1195 .remove = sii902x_remove, 1196 .driver = { 1197 .name = "sii902x", 1198 .of_match_table = sii902x_dt_ids, 1199 }, 1200 .id_table = sii902x_i2c_ids, 1201 }; 1202 module_i2c_driver(sii902x_driver); 1203 1204 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 1205 MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges"); 1206 MODULE_LICENSE("GPL"); 1207