[v6,6/6] drm/bridge: sii902x: Implement HDMI audio support

Implement HDMI audio support by using ASoC HDMI codec. The commit
implements the necessary callbacks and configuration for the HDMI
codec and registers a virtual platform device for the codec to attach.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
---
 drivers/gpu/drm/bridge/sii902x.c | 467 ++++++++++++++++++++++++++++++-
 1 file changed, 461 insertions(+), 6 deletions(-)

Hi Jyri,

On 02/04/2019 10.29, Jyri Sarha wrote:
> Implement HDMI audio support by using ASoC HDMI codec. The commit
> implements the necessary callbacks and configuration for the HDMI
> codec and registers a virtual platform device for the codec to attach.

it looks good:

Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>

> Signed-off-by: Jyri Sarha <jsarha@ti.com>
> ---
>  drivers/gpu/drm/bridge/sii902x.c | 467 ++++++++++++++++++++++++++++++-
>  1 file changed, 461 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
> index 358cf81c5ea4..553f1244f930 100644
> --- a/drivers/gpu/drm/bridge/sii902x.c
> +++ b/drivers/gpu/drm/bridge/sii902x.c
> @@ -27,12 +27,15 @@
>  #include <linux/i2c.h>
>  #include <linux/module.h>
>  #include <linux/regmap.h>
> +#include <linux/clk.h>
>  
>  #include <drm/drmP.h>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_crtc_helper.h>
>  #include <drm/drm_edid.h>
>  
> +#include <sound/hdmi-codec.h>
> +
>  #define SII902X_TPI_VIDEO_DATA			0x0
>  
>  #define SII902X_TPI_PIXEL_REPETITION		0x8
> @@ -74,6 +77,77 @@
>  #define SII902X_AVI_POWER_STATE_MSK		GENMASK(1, 0)
>  #define SII902X_AVI_POWER_STATE_D(l)		((l) & SII902X_AVI_POWER_STATE_MSK)
>  
> +/* Audio  */
> +#define SII902X_TPI_I2S_ENABLE_MAPPING_REG	0x1f
> +#define SII902X_TPI_I2S_CONFIG_FIFO0			(0 << 0)
> +#define SII902X_TPI_I2S_CONFIG_FIFO1			(1 << 0)
> +#define SII902X_TPI_I2S_CONFIG_FIFO2			(2 << 0)
> +#define SII902X_TPI_I2S_CONFIG_FIFO3			(3 << 0)
> +#define SII902X_TPI_I2S_LEFT_RIGHT_SWAP			(1 << 2)
> +#define SII902X_TPI_I2S_AUTO_DOWNSAMPLE			(1 << 3)
> +#define SII902X_TPI_I2S_SELECT_SD0			(0 << 4)
> +#define SII902X_TPI_I2S_SELECT_SD1			(1 << 4)
> +#define SII902X_TPI_I2S_SELECT_SD2			(2 << 4)
> +#define SII902X_TPI_I2S_SELECT_SD3			(3 << 4)
> +#define SII902X_TPI_I2S_FIFO_ENABLE			(1 << 7)
> +
> +#define SII902X_TPI_I2S_INPUT_CONFIG_REG	0x20
> +#define SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES		(0 << 0)
> +#define SII902X_TPI_I2S_FIRST_BIT_SHIFT_NO		(1 << 0)
> +#define SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST		(0 << 1)
> +#define SII902X_TPI_I2S_SD_DIRECTION_LSB_FIRST		(1 << 1)
> +#define SII902X_TPI_I2S_SD_JUSTIFY_LEFT			(0 << 2)
> +#define SII902X_TPI_I2S_SD_JUSTIFY_RIGHT		(1 << 2)
> +#define SII902X_TPI_I2S_WS_POLARITY_LOW			(0 << 3)
> +#define SII902X_TPI_I2S_WS_POLARITY_HIGH		(1 << 3)
> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_128		(0 << 4)
> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_256		(1 << 4)
> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_384		(2 << 4)
> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_512		(3 << 4)
> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_768		(4 << 4)
> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_1024		(5 << 4)
> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_1152		(6 << 4)
> +#define SII902X_TPI_I2S_MCLK_MULTIPLIER_192		(7 << 4)
> +#define SII902X_TPI_I2S_SCK_EDGE_FALLING		(0 << 7)
> +#define SII902X_TPI_I2S_SCK_EDGE_RISING			(1 << 7)
> +
> +#define SII902X_TPI_I2S_STRM_HDR_BASE	0x21
> +#define SII902X_TPI_I2S_STRM_HDR_SIZE	5
> +
> +#define SII902X_TPI_AUDIO_CONFIG_BYTE2_REG	0x26
> +#define SII902X_TPI_AUDIO_CODING_STREAM_HEADER		(0 << 0)
> +#define SII902X_TPI_AUDIO_CODING_PCM			(1 << 0)
> +#define SII902X_TPI_AUDIO_CODING_AC3			(2 << 0)
> +#define SII902X_TPI_AUDIO_CODING_MPEG1			(3 << 0)
> +#define SII902X_TPI_AUDIO_CODING_MP3			(4 << 0)
> +#define SII902X_TPI_AUDIO_CODING_MPEG2			(5 << 0)
> +#define SII902X_TPI_AUDIO_CODING_AAC			(6 << 0)
> +#define SII902X_TPI_AUDIO_CODING_DTS			(7 << 0)
> +#define SII902X_TPI_AUDIO_CODING_ATRAC			(8 << 0)
> +#define SII902X_TPI_AUDIO_MUTE_DISABLE			(0 << 4)
> +#define SII902X_TPI_AUDIO_MUTE_ENABLE			(1 << 4)
> +#define SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS		(0 << 5)
> +#define SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS		(1 << 5)
> +#define SII902X_TPI_AUDIO_INTERFACE_DISABLE		(0 << 6)
> +#define SII902X_TPI_AUDIO_INTERFACE_SPDIF		(1 << 6)
> +#define SII902X_TPI_AUDIO_INTERFACE_I2S			(2 << 6)
> +
> +#define SII902X_TPI_AUDIO_CONFIG_BYTE3_REG	0x27
> +#define SII902X_TPI_AUDIO_FREQ_STREAM			(0 << 3)
> +#define SII902X_TPI_AUDIO_FREQ_32KHZ			(1 << 3)
> +#define SII902X_TPI_AUDIO_FREQ_44KHZ			(2 << 3)
> +#define SII902X_TPI_AUDIO_FREQ_48KHZ			(3 << 3)
> +#define SII902X_TPI_AUDIO_FREQ_88KHZ			(4 << 3)
> +#define SII902X_TPI_AUDIO_FREQ_96KHZ			(5 << 3)
> +#define SII902X_TPI_AUDIO_FREQ_176KHZ			(6 << 3)
> +#define SII902X_TPI_AUDIO_FREQ_192KHZ			(7 << 3)
> +#define SII902X_TPI_AUDIO_SAMPLE_SIZE_STREAM		(0 << 6)
> +#define SII902X_TPI_AUDIO_SAMPLE_SIZE_16		(1 << 6)
> +#define SII902X_TPI_AUDIO_SAMPLE_SIZE_20		(2 << 6)
> +#define SII902X_TPI_AUDIO_SAMPLE_SIZE_24		(3 << 6)
> +
> +#define SII902X_TPI_AUDIO_CONFIG_BYTE4_REG	0x28
> +
>  #define SII902X_INT_ENABLE			0x3c
>  #define SII902X_INT_STATUS			0x3d
>  #define SII902X_HOTPLUG_EVENT			BIT(0)
> @@ -81,6 +155,16 @@
>  
>  #define SII902X_REG_TPI_RQB			0xc7
>  
> +/* Indirect internal register access */
> +#define SII902X_IND_SET_PAGE			0xbc
> +#define SII902X_IND_OFFSET			0xbd
> +#define SII902X_IND_VALUE			0xbe
> +
> +#define SII902X_TPI_MISC_INFOFRAME_BASE		0xbf
> +#define SII902X_TPI_MISC_INFOFRAME_END		0xde
> +#define SII902X_TPI_MISC_INFOFRAME_SIZE	\
> +	(SII902X_TPI_MISC_INFOFRAME_END - SII902X_TPI_MISC_INFOFRAME_BASE)
> +
>  #define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS	500
>  
>  struct sii902x {
> @@ -90,6 +174,16 @@ struct sii902x {
>  	struct drm_connector connector;
>  	struct gpio_desc *reset_gpio;
>  	struct i2c_mux_core *i2cmux;
> +	/*
> +	 * Mutex protects audio and video functions from interfering
> +	 * each other, by keeping their i2c command sequences atomic.
> +	 */
> +	struct mutex mutex;
> +	struct sii902x_audio {
> +		struct platform_device *pdev;
> +		struct clk *mclk;
> +		u32 i2s_fifo_sequence[4];
> +	} audio;
>  };
>  
>  static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
> @@ -161,8 +255,12 @@ sii902x_connector_detect(struct drm_connector *connector, bool force)
>  	struct sii902x *sii902x = connector_to_sii902x(connector);
>  	unsigned int status;
>  
> +	mutex_lock(&sii902x->mutex);
> +
>  	regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
>  
> +	mutex_unlock(&sii902x->mutex);
> +
>  	return (status & SII902X_PLUGGED_STATUS) ?
>  	       connector_status_connected : connector_status_disconnected;
>  }
> @@ -184,6 +282,8 @@ static int sii902x_get_modes(struct drm_connector *connector)
>  	struct edid *edid;
>  	int num = 0, ret;
>  
> +	mutex_lock(&sii902x->mutex);
> +
>  	edid = drm_get_edid(connector, sii902x->i2cmux->adapter[0]);
>  	drm_connector_update_edid_property(connector, edid);
>  	if (edid) {
> @@ -197,14 +297,19 @@ static int sii902x_get_modes(struct drm_connector *connector)
>  	ret = drm_display_info_set_bus_formats(&connector->display_info,
>  					       &bus_format, 1);
>  	if (ret)
> -		return ret;
> +		goto error_out;
>  
>  	ret = regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
>  				 SII902X_SYS_CTRL_OUTPUT_MODE, output_mode);
>  	if (ret)
> -		return ret;
> +		goto error_out;
> +
> +	ret = num;
> +
> +error_out:
> +	mutex_unlock(&sii902x->mutex);
>  
> -	return num;
> +	return ret;
>  }
>  
>  static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
> @@ -224,20 +329,28 @@ static void sii902x_bridge_disable(struct drm_bridge *bridge)
>  {
>  	struct sii902x *sii902x = bridge_to_sii902x(bridge);
>  
> +	mutex_lock(&sii902x->mutex);
> +
>  	regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
>  			   SII902X_SYS_CTRL_PWR_DWN,
>  			   SII902X_SYS_CTRL_PWR_DWN);
> +
> +	mutex_unlock(&sii902x->mutex);
>  }
>  
>  static void sii902x_bridge_enable(struct drm_bridge *bridge)
>  {
>  	struct sii902x *sii902x = bridge_to_sii902x(bridge);
>  
> +	mutex_lock(&sii902x->mutex);
> +
>  	regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
>  			   SII902X_AVI_POWER_STATE_MSK,
>  			   SII902X_AVI_POWER_STATE_D(0));
>  	regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
>  			   SII902X_SYS_CTRL_PWR_DWN, 0);
> +
> +	mutex_unlock(&sii902x->mutex);
>  }
>  
>  static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
> @@ -264,26 +377,31 @@ static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
>  	buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
>  		 SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
>  
> +	mutex_lock(&sii902x->mutex);
> +
>  	ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
>  	if (ret)
> -		return;
> +		goto out;
>  
>  	ret = drm_hdmi_avi_infoframe_from_display_mode(&frame, adj, false);
>  	if (ret < 0) {
>  		DRM_ERROR("couldn't fill AVI infoframe\n");
> -		return;
> +		goto out;
>  	}
>  
>  	ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
>  	if (ret < 0) {
>  		DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
> -		return;
> +		goto out;
>  	}
>  
>  	/* Do not send the infoframe header, but keep the CRC field. */
>  	regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
>  			  buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
>  			  HDMI_AVI_INFOFRAME_SIZE + 1);
> +
> +out:
> +	mutex_unlock(&sii902x->mutex);
>  }
>  
>  static int sii902x_bridge_attach(struct drm_bridge *bridge)
> @@ -324,6 +442,338 @@ static const struct drm_bridge_funcs sii902x_bridge_funcs = {
>  	.enable = sii902x_bridge_enable,
>  };
>  
> +static int sii902x_mute(struct sii902x *sii902x, bool mute)
> +{
> +	struct device *dev = &sii902x->i2c->dev;
> +	unsigned int val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE :
> +		SII902X_TPI_AUDIO_MUTE_DISABLE;
> +
> +	dev_dbg(dev, "%s: %s\n", __func__, mute ? "Muted" : "Unmuted");
> +
> +	return regmap_update_bits(sii902x->regmap,
> +				  SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
> +				  SII902X_TPI_AUDIO_MUTE_ENABLE, val);
> +}
> +
> +static const unsigned int sii902x_mclk_div_table[] = {
> +	128, 256, 384, 512, 768, 1024, 1152, 192 };
> +
> +static int sii902x_select_mclk_div(u8 *i2s_config_reg, unsigned int rate,
> +				   unsigned int mclk)
> +{
> +	unsigned int div = mclk / rate;
> +	int distance = 100000;
> +	u8 i, nearest = 0;
> +
> +	for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
> +		unsigned int d = abs(div - sii902x_mclk_div_table[i]);
> +
> +		if (d >= distance)
> +			continue;
> +
> +		nearest = i;
> +		distance = d;
> +		if (d == 0)
> +			break;
> +	}
> +
> +	*i2s_config_reg |= nearest << 4;
> +
> +	if (distance != 0)
> +		return sii902x_mclk_div_table[nearest];
> +
> +	return 0;
> +}
> +
> +static const struct sii902x_sample_freq {
> +	u32 freq;
> +	u8 val;
> +} sii902x_sample_freq[] = {
> +	{ .freq = 32000,	.val = SII902X_TPI_AUDIO_FREQ_32KHZ },
> +	{ .freq = 44000,	.val = SII902X_TPI_AUDIO_FREQ_44KHZ },
> +	{ .freq = 48000,	.val = SII902X_TPI_AUDIO_FREQ_48KHZ },
> +	{ .freq = 88000,	.val = SII902X_TPI_AUDIO_FREQ_88KHZ },
> +	{ .freq = 96000,	.val = SII902X_TPI_AUDIO_FREQ_96KHZ },
> +	{ .freq = 176000,	.val = SII902X_TPI_AUDIO_FREQ_176KHZ },
> +	{ .freq = 192000,	.val = SII902X_TPI_AUDIO_FREQ_192KHZ },
> +};
> +
> +static int sii902x_audio_hw_params(struct device *dev, void *data,
> +				   struct hdmi_codec_daifmt *daifmt,
> +				   struct hdmi_codec_params *params)
> +{
> +	struct sii902x *sii902x = dev_get_drvdata(dev);
> +	u8 i2s_config_reg = SII902X_TPI_I2S_SD_DIRECTION_MSB_FIRST;
> +	u8 config_byte2_reg = (SII902X_TPI_AUDIO_INTERFACE_I2S |
> +			       SII902X_TPI_AUDIO_MUTE_ENABLE |
> +			       SII902X_TPI_AUDIO_CODING_PCM);
> +	u8 config_byte3_reg = 0;
> +	u8 infoframe_buf[HDMI_INFOFRAME_SIZE(AUDIO)];
> +	unsigned long mclk_rate;
> +	int i, ret;
> +
> +	if (daifmt->bit_clk_master || daifmt->frame_clk_master) {
> +		dev_dbg(dev, "%s: I2S master mode not supported\n", __func__);
> +		return -EINVAL;
> +	}
> +
> +	switch (daifmt->fmt) {
> +	case HDMI_I2S:
> +		i2s_config_reg |= SII902X_TPI_I2S_FIRST_BIT_SHIFT_YES |
> +			SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
> +		break;
> +	case HDMI_RIGHT_J:
> +		i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_RIGHT;
> +		break;
> +	case HDMI_LEFT_J:
> +		i2s_config_reg |= SII902X_TPI_I2S_SD_JUSTIFY_LEFT;
> +		break;
> +	default:
> +		dev_dbg(dev, "%s: Unsupported i2s format %u\n", __func__,
> +			daifmt->fmt);
> +		return -EINVAL;
> +	}
> +
> +	if (daifmt->bit_clk_inv)
> +		i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_FALLING;
> +	else
> +		i2s_config_reg |= SII902X_TPI_I2S_SCK_EDGE_RISING;
> +
> +	if (daifmt->frame_clk_inv)
> +		i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_LOW;
> +	else
> +		i2s_config_reg |= SII902X_TPI_I2S_WS_POLARITY_HIGH;
> +
> +	if (params->channels > 2)
> +		config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_8_CHANNELS;
> +	else
> +		config_byte2_reg |= SII902X_TPI_AUDIO_LAYOUT_2_CHANNELS;
> +
> +	switch (params->sample_width) {
> +	case 16:
> +		config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_16;
> +		break;
> +	case 20:
> +		config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_20;
> +		break;
> +	case 24:
> +	case 32:
> +		config_byte3_reg |= SII902X_TPI_AUDIO_SAMPLE_SIZE_24;
> +		break;
> +	default:
> +		dev_err(dev, "%s: Unsupported sample width %u\n", __func__,
> +			params->sample_width);
> +		return -EINVAL;
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(sii902x_sample_freq); i++) {
> +		if (params->sample_rate == sii902x_sample_freq[i].freq) {
> +			config_byte3_reg |= sii902x_sample_freq[i].val;
> +			break;
> +		}
> +	}
> +
> +	ret = clk_prepare_enable(sii902x->audio.mclk);
> +	if (ret) {
> +		dev_err(dev, "Enabling mclk failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	mclk_rate = clk_get_rate(sii902x->audio.mclk);
> +
> +	ret = sii902x_select_mclk_div(&i2s_config_reg, params->sample_rate,
> +				      mclk_rate);
> +	if (ret)
> +		dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
> +			mclk_rate, ret, params->sample_rate);
> +
> +	mutex_lock(&sii902x->mutex);
> +
> +	ret = regmap_write(sii902x->regmap,
> +			   SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
> +			   config_byte2_reg);
> +	if (ret < 0)
> +		goto out;
> +
> +	ret = regmap_write(sii902x->regmap, SII902X_TPI_I2S_INPUT_CONFIG_REG,
> +			   i2s_config_reg);
> +	if (ret)
> +		goto out;
> +
> +	for (i = 0; sii902x->audio.i2s_fifo_sequence[i] &&
> +		     i < ARRAY_SIZE(sii902x->audio.i2s_fifo_sequence); i++)
> +		regmap_write(sii902x->regmap,
> +			     SII902X_TPI_I2S_ENABLE_MAPPING_REG,
> +			     sii902x->audio.i2s_fifo_sequence[i]);
> +
> +	ret = regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE3_REG,
> +			   config_byte3_reg);
> +	if (ret)
> +		goto out;
> +
> +	ret = regmap_bulk_write(sii902x->regmap, SII902X_TPI_I2S_STRM_HDR_BASE,
> +				params->iec.status,
> +				min((size_t) SII902X_TPI_I2S_STRM_HDR_SIZE,
> +				    sizeof(params->iec.status)));
> +	if (ret)
> +		goto out;
> +
> +	ret = hdmi_audio_infoframe_pack(&params->cea, infoframe_buf,
> +					sizeof(infoframe_buf));
> +	if (ret < 0) {
> +		dev_err(dev, "%s: Failed to pack audio infoframe: %d\n",
> +			__func__, ret);
> +		goto out;
> +	}
> +
> +	ret = regmap_bulk_write(sii902x->regmap,
> +				SII902X_TPI_MISC_INFOFRAME_BASE,
> +				infoframe_buf,
> +				min(ret, SII902X_TPI_MISC_INFOFRAME_SIZE));
> +	if (ret)
> +		goto out;
> +
> +	/* Decode Level 0 Packets */
> +	ret = regmap_write(sii902x->regmap, SII902X_IND_SET_PAGE, 0x02);
> +	if (ret)
> +		goto out;
> +
> +	ret = regmap_write(sii902x->regmap, SII902X_IND_OFFSET, 0x24);
> +	if (ret)
> +		goto out;
> +
> +	ret = regmap_write(sii902x->regmap, SII902X_IND_VALUE, 0x02);
> +	if (ret)
> +		goto out;
> +
> +	dev_dbg(dev, "%s: hdmi audio enabled\n", __func__);
> +out:
> +	mutex_unlock(&sii902x->mutex);
> +
> +	if (ret) {
> +		clk_disable_unprepare(sii902x->audio.mclk);
> +		dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
> +			ret);
> +	}
> +
> +	return ret;
> +}
> +
> +static void sii902x_audio_shutdown(struct device *dev, void *data)
> +{
> +	struct sii902x *sii902x = dev_get_drvdata(dev);
> +
> +	mutex_lock(&sii902x->mutex);
> +
> +	regmap_write(sii902x->regmap, SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
> +		     SII902X_TPI_AUDIO_INTERFACE_DISABLE);
> +
> +	mutex_unlock(&sii902x->mutex);
> +
> +	clk_disable_unprepare(sii902x->audio.mclk);
> +}
> +
> +int sii902x_audio_digital_mute(struct device *dev, void *data, bool enable)
> +{
> +	struct sii902x *sii902x = dev_get_drvdata(dev);
> +
> +	mutex_lock(&sii902x->mutex);
> +
> +	sii902x_mute(sii902x, enable);
> +
> +	mutex_unlock(&sii902x->mutex);
> +
> +	return 0;
> +}
> +
> +static int sii902x_audio_get_eld(struct device *dev, void *data,
> +				 uint8_t *buf, size_t len)
> +{
> +	struct sii902x *sii902x = dev_get_drvdata(dev);
> +
> +	mutex_lock(&sii902x->mutex);
> +
> +	memcpy(buf, sii902x->connector.eld,
> +	       min(sizeof(sii902x->connector.eld), len));
> +
> +	mutex_unlock(&sii902x->mutex);
> +
> +	return 0;
> +}
> +
> +static const struct hdmi_codec_ops sii902x_audio_codec_ops = {
> +	.hw_params = sii902x_audio_hw_params,
> +	.audio_shutdown = sii902x_audio_shutdown,
> +	.digital_mute = sii902x_audio_digital_mute,
> +	.get_eld = sii902x_audio_get_eld,
> +};
> +
> +static int sii902x_audio_codec_init(struct sii902x *sii902x,
> +				    struct device *dev)
> +{
> +	static const u8 audio_fifo_id[] = {
> +		SII902X_TPI_I2S_CONFIG_FIFO0,
> +		SII902X_TPI_I2S_CONFIG_FIFO1,
> +		SII902X_TPI_I2S_CONFIG_FIFO2,
> +		SII902X_TPI_I2S_CONFIG_FIFO3,
> +	};
> +	static const u8 i2s_lane_id[] = {
> +		SII902X_TPI_I2S_SELECT_SD0,
> +		SII902X_TPI_I2S_SELECT_SD1,
> +		SII902X_TPI_I2S_SELECT_SD2,
> +		SII902X_TPI_I2S_SELECT_SD3,
> +	};
> +	struct hdmi_codec_pdata codec_data = {
> +		.ops = &sii902x_audio_codec_ops,
> +		.i2s = 1, /* Only i2s support for now. */
> +		.spdif = 0,
> +		.max_i2s_channels = 0,
> +	};
> +	u8 lanes[4];
> +	u32 num_lanes, i;
> +
> +	if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) {
> +		dev_dbg(dev, "%s: No \"#sound-dai-cells\", no audio\n",
> +			__func__);
> +		return 0;
> +	}
> +
> +	num_lanes = of_property_read_variable_u8_array(dev->of_node,
> +						       "sil,i2s-data-lanes",
> +						       lanes, 1,
> +						       ARRAY_SIZE(lanes));
> +
> +	if (num_lanes == -EINVAL) {
> +		dev_dbg(dev,
> +			"%s: No \"sil,i2s-data-lanes\", use default <0>\n",
> +			__func__);
> +		num_lanes = 1;
> +		lanes[0] = 0;
> +	} else if (num_lanes < 0) {
> +		dev_err(dev,
> +			"%s: Error gettin \"sil,i2s-data-lanes\": %d\n",
> +			__func__, num_lanes);
> +		return num_lanes;
> +	}
> +	codec_data.max_i2s_channels = 2 * num_lanes;
> +
> +	for (i = 0; i < num_lanes; i++)
> +		sii902x->audio.i2s_fifo_sequence[i] |= audio_fifo_id[i] |
> +			i2s_lane_id[lanes[i]] |	SII902X_TPI_I2S_FIFO_ENABLE;
> +
> +	if (IS_ERR(sii902x->audio.mclk)) {
> +		dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
> +			__func__, PTR_ERR(sii902x->audio.mclk));
> +		return 0;
> +	}
> +
> +	sii902x->audio.pdev = platform_device_register_data(
> +		dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
> +		&codec_data, sizeof(codec_data));
> +
> +	return PTR_ERR_OR_ZERO(sii902x->audio.pdev);
> +}
> +
>  static const struct regmap_range sii902x_volatile_ranges[] = {
>  	{ .range_min = 0, .range_max = 0xff },
>  };
> @@ -336,6 +786,7 @@ static const struct regmap_access_table sii902x_volatile_table = {
>  static const struct regmap_config sii902x_regmap_config = {
>  	.reg_bits = 8,
>  	.val_bits = 8,
> +	.max_register = SII902X_TPI_MISC_INFOFRAME_END,
>  	.volatile_table = &sii902x_volatile_table,
>  	.cache_type = REGCACHE_NONE,
>  };
> @@ -508,6 +959,8 @@ static int sii902x_probe(struct i2c_client *client,
>  		return PTR_ERR(sii902x->reset_gpio);
>  	}
>  
> +	mutex_init(&sii902x->mutex);
> +
>  	sii902x_reset(sii902x);
>  
>  	ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
> @@ -548,6 +1001,8 @@ static int sii902x_probe(struct i2c_client *client,
>  	sii902x->bridge.timings = &default_sii902x_timings;
>  	drm_bridge_add(&sii902x->bridge);
>  
> +	sii902x_audio_codec_init(sii902x, dev);
> +
>  	i2c_set_clientdata(client, sii902x);
>  
>  	sii902x->i2cmux = i2c_mux_alloc(client->adapter, dev,
> 

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