[v4,6/6] drm/bridge: sii902x: Implement HDMI audio support

Message ID a798bd2c2e418160819db610bd03abf93138d04a.1552562385.git.jsarha@ti.com
State Superseded
Headers show
Series
  • drm/bridge: sii902x: HDMI-audio support and some fixes
Related show

Commit Message

Jyri Sarha March 14, 2019, 11:27 a.m.
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 | 460 ++++++++++++++++++++++++++++++-
 1 file changed, 453 insertions(+), 7 deletions(-)

Comments

Olivier Moysan March 14, 2019, 3:44 p.m. | #1
Hello Jyri,

STM32MP157C-DK2 discovery boards use a SiI9022A HDMI transmitter.
see: https://www.st.com/en/evaluation-tools/stm32mp157c-dk2.html

On this board audio samples are sent to HDMI transmitter through the i2s 
link. This i2s link does not provide a master clock. internal PLL is 
used instead.

The support of audio on this board is already available through the 
following patch:
https://github.com/STMicroelectronics/linux/blob/v4.19-stm32mp/drivers/gpu/drm/bridge/sii902x.c

I tried your patch on this STM32MP157C-DK2 board. I could get audio, 
after reworking the patch. However, I had to make the following changes:
- make master clock configuration optional
- add of graph support for audio

Could you please update current patch to take these restrictions into 
account ?

BRs
Olivier


On 3/14/19 12:27 PM, 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.

> 

> Signed-off-by: Jyri Sarha <jsarha@ti.com>

> ---

>   drivers/gpu/drm/bridge/sii902x.c | 460 ++++++++++++++++++++++++++++++-

>   1 file changed, 453 insertions(+), 7 deletions(-)

> 

> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c

> index 1d99108440c1..39a0d25009f2 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;

>   }

> @@ -180,10 +278,12 @@ static int sii902x_get_modes(struct drm_connector *connector)

>   {

>   	struct sii902x *sii902x = connector_to_sii902x(connector);

>   	u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;

> -	struct edid *edid;

>   	u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;

> +	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;

>   

> -	return num;

> +	ret = num;

> +

> +error_out:

> +	mutex_unlock(&sii902x->mutex);

> +

> +	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 +442,329 @@ 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;

> +

> +	num_lanes = of_property_read_variable_u8_array(dev->of_node,

> +						       "i2s-data-lanes",

> +						       lanes, 1,

> +						       ARRAY_SIZE(lanes));

> +	if (num_lanes < 0) {

> +		if (num_lanes == -EINVAL)

> +			dev_dbg(dev, "%s: No \"i2s-data-lanes\", no audio\n",

> +			__func__);

> +		else

> +			dev_err(dev,

> +				"%s: Error gettin \"i2s-data-lanes\": %d\n",

> +				__func__, num_lanes);

> +		return 0;

> +	}

> +	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 +777,7 @@ 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 +950,8 @@ 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 +992,8 @@ 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,

>

Patch

diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
index 1d99108440c1..39a0d25009f2 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;
 }
@@ -180,10 +278,12 @@  static int sii902x_get_modes(struct drm_connector *connector)
 {
 	struct sii902x *sii902x = connector_to_sii902x(connector);
 	u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
-	struct edid *edid;
 	u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
+	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;
 
-	return num;
+	ret = num;
+
+error_out:
+	mutex_unlock(&sii902x->mutex);
+
+	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 +442,329 @@  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;
+
+	num_lanes = of_property_read_variable_u8_array(dev->of_node,
+						       "i2s-data-lanes",
+						       lanes, 1,
+						       ARRAY_SIZE(lanes));
+	if (num_lanes < 0) {
+		if (num_lanes == -EINVAL)
+			dev_dbg(dev, "%s: No \"i2s-data-lanes\", no audio\n",
+			__func__);
+		else
+			dev_err(dev,
+				"%s: Error gettin \"i2s-data-lanes\": %d\n",
+				__func__, num_lanes);
+		return 0;
+	}
+	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 +777,7 @@  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 +950,8 @@  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 +992,8 @@  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,