[3/4] drm/bridge: sii902x: Implement HDMI audio support

Message ID 9b7d96b02731cd53359a924e4c5f8b8f2d550717.1551090126.git.jsarha@ti.com
State New
Headers show
Series
  • drm/bridge: sii902x: HDMI-audio support and some fixes
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Commit Message

Jyri Sarha Feb. 25, 2019, 11:23 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>
---
 .../bindings/display/bridge/sii902x.txt       |  24 +
 drivers/gpu/drm/bridge/sii902x.c              | 456 +++++++++++++++++-
 include/dt-bindings/sound/sii902x-audio.h     |  11 +
 3 files changed, 485 insertions(+), 6 deletions(-)
 create mode 100644 include/dt-bindings/sound/sii902x-audio.h

Comments

Andrzej Hajda Feb. 25, 2019, 1:57 p.m. | #1
On 25.02.2019 12:23, 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>
> ---
>  .../bindings/display/bridge/sii902x.txt       |  24 +
>  drivers/gpu/drm/bridge/sii902x.c              | 456 +++++++++++++++++-
>  include/dt-bindings/sound/sii902x-audio.h     |  11 +
>  3 files changed, 485 insertions(+), 6 deletions(-)
>  create mode 100644 include/dt-bindings/sound/sii902x-audio.h
>
> diff --git a/Documentation/devicetree/bindings/display/bridge/sii902x.txt b/Documentation/devicetree/bindings/display/bridge/sii902x.txt
> index 72d2dc6c3e6b..a1cff91e4e84 100644
> --- a/Documentation/devicetree/bindings/display/bridge/sii902x.txt
> +++ b/Documentation/devicetree/bindings/display/bridge/sii902x.txt
> @@ -8,6 +8,21 @@ Optional properties:
>  	- interrupts: describe the interrupt line used to inform the host 
>  	  about hotplug events.
>  	- reset-gpios: OF device-tree gpio specification for RST_N pin.
> +	- i2s-fifo-routing: Array of exactly 4 integers indicating i2s
> +	  pins for audio fifo routing. First integer defines routing to
> +	  fifo 0 and second to fifo 1, etc. Integers can be filled with
> +	  definitions from: include/dt-bindings/sound/sii902x-audio.h
> +	  The available definitions are:
> +	  - ENABLE_BIT:	enable this audio fifo
> +	  - CONNECT_SD#: route audio input from SD0, SD1, SD2, or SD3 i2s
> +			 data input pin
> +	  - LEFT_RIGHT_SWAP_BIT: swap i2s input channels for this fifo
> +	  I2S HDMI audio is configured only if this property is found.
> +	- clocks: describes SII902x MCLK input. MCLK is used to produce
> +	  HDMI audio CTS values. This property is required if
> +	  "i2s-fifo-routing"-property is present. This property follows
> +	  Documentation/devicetree/bindings/clock/clock-bindings.txt
> +	  consumer binding.


I wonder if it wouldn't be better to use of_graph to show connections
between audio producer (A/V media processor) and the transmitter,
i2s-fifo-routing value should be then derived from these bindings.


>  
>  Optional subnodes:
>  	- video input: this subnode can contain a video input port node
> @@ -21,6 +36,15 @@ Example:
>  		compatible = "sil,sii9022";
>  		reg = <0x39>;
>  		reset-gpios = <&pioA 1 0>;
> +
> +		i2s-fifo-routing = <
> +			(ENABLE_BIT|CONNECT_SD0)
> +			0
> +			0
> +			0
> +		>;
> +		clocks = <&mclk>;
> +
>  		ports {
>  			#address-cells = <1>;
>  			#size-cells = <0>;
> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
> index 0e21fa419d27..f296a33c57c7 100644
> --- a/drivers/gpu/drm/bridge/sii902x.c
> +++ b/drivers/gpu/drm/bridge/sii902x.c
> @@ -27,12 +27,16 @@
>  #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>
> +#include <dt-bindings/sound/sii902x-audio.h>
> +
>  #define SII902X_TPI_VIDEO_DATA			0x0
>  
>  #define SII902X_TPI_PIXEL_REPETITION		0x8
> @@ -74,6 +78,77 @@
>  #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 +156,16 @@
>  
>  #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 +175,12 @@ struct sii902x {
>  	struct drm_connector connector;
>  	struct gpio_desc *reset_gpio;
>  	struct i2c_mux_core *i2cmux;
> +	struct mutex mutex;


Maybe adding mutex should be preparatory patch.


> +	struct sii902x_audio {
> +		struct platform_device *pdev;
> +		struct clk *mclk;
> +		u32 i2s_fifo_routing[4];
> +	} audio;
>  };
>  
>  static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
> @@ -161,8 +252,12 @@ 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 +279,8 @@ static int sii902x_get_modes(struct drm_connector *connector)
>  	u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
>  	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 +294,19 @@ 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;
>  
> -	return num;
> +error_out:
> +	mutex_unlock(&sii902x->mutex);
> +
> +	return ret;
>  }
>  
>  static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
> @@ -224,20 +326,28 @@ 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,
> @@ -263,26 +373,31 @@ 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)
> @@ -323,6 +438,329 @@ static const struct drm_bridge_funcs sii902x_bridge_funcs = {
>  	.enable = sii902x_bridge_enable,
>  };
>  
> +static int sii902x_mute(struct sii902x *sii902x, int mute)


maybe: bool mute


> +{
> +	struct device *dev = &sii902x->i2c->dev;
> +	int ret;
> +
> +	if (mute) {
> +		dev_dbg(dev, "%s: Muted (%d)\n", __func__, mute);
> +		ret = regmap_update_bits(sii902x->regmap,
> +					 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
> +					 SII902X_TPI_AUDIO_MUTE_ENABLE,
> +					 SII902X_TPI_AUDIO_MUTE_ENABLE);
> +	} else {
> +		dev_dbg(dev, "%s: Unmuted (%d)\n", __func__, mute);
> +		ret = regmap_update_bits(sii902x->regmap,
> +					 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
> +					 SII902X_TPI_AUDIO_MUTE_ENABLE,
> +					 SII902X_TPI_AUDIO_MUTE_DISABLE);
> +	}


You can replace this big 'if' with one call to:

val = mute ? SII902X_TPI_AUDIO_MUTE_ENABLE : SII902X_TPI_AUDIO_MUTE_DISABLE;

ret = regmap_update_bits(sii902x->regmap,
    SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
    SII902X_TPI_AUDIO_MUTE_ENABLE,
    val);

> +	return ret;
> +}
> +
> +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)
> +{
> +	int distance = 100000;
> +	u8 i, nearest = 0;
> +
> +	for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
> +		unsigned int div = mclk / rate;
> +
> +		if (abs(div - sii902x_mclk_div_table[i]) < distance) {
> +			nearest = i;
> +			distance = abs(div - sii902x_mclk_div_table[i]);
> +		}
> +		if (div == sii902x_mclk_div_table[i])
> +			break;

unsigned int div = mclk / rate;


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;

    if (d == 0)

        break;

    distance = d;

}


> +	}
> +
> +	*i2s_config_reg |= nearest << 4;
> +
> +	if (i == ARRAY_SIZE(sii902x_mclk_div_table))
> +		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;
> +		}
> +	}
> +
> +	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);
> +
> +	ret = clk_prepare_enable(sii902x->audio.mclk);
> +	if (ret) {
> +		dev_err(dev, "Enabling mclk failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	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; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_routing); i++)
> +		regmap_write(sii902x->regmap,
> +			     SII902X_TPI_I2S_ENABLE_MAPPING_REG,
> +			     sii902x->audio.i2s_fifo_routing[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 i2s_fifo_defaults[] = {
> +		SII902X_TPI_I2S_CONFIG_FIFO0,
> +		SII902X_TPI_I2S_CONFIG_FIFO1,
> +		SII902X_TPI_I2S_CONFIG_FIFO2,
> +		SII902X_TPI_I2S_CONFIG_FIFO3,
> +	};
> +	struct hdmi_codec_pdata codec_data = {
> +		.ops = &sii902x_audio_codec_ops,
> +		.i2s = 1, /* Only i2s support for now. */
> +		.spdif = 0,
> +		.max_i2s_channels = 0,
> +	};
> +	int ret, i;
> +
> +	ret = of_property_read_u32_array(dev->of_node, "i2s-fifo-routing",
> +					 sii902x->audio.i2s_fifo_routing,
> +					 ARRAY_SIZE(sii902x->audio.i2s_fifo_routing));
> +
> +	if (ret != 0) {
> +		if (ret == -EINVAL)
> +			dev_dbg(dev, "%s: No \"i2s-fifo-routing\", no audio\n",
> +			__func__);
> +		else
> +			dev_err(dev,
> +				"%s: Error gettin \"i2s-fifo-routing\": %d\n",
> +				__func__, ret);
> +		return 0;
> +	}
> +
> +	sii902x->audio.mclk = devm_clk_get(dev, NULL);
> +	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;
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_routing); i++) {
> +		if (sii902x->audio.i2s_fifo_routing[i] | ENABLE_BIT)


It is always true.


Regards

Andrzej


> +			codec_data.max_i2s_channels += 2;
> +		sii902x->audio.i2s_fifo_routing[i] |= i2s_fifo_defaults[i];
> +	}
> +
> +	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 },
>  };
> @@ -335,6 +773,7 @@ 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,
>  };
> @@ -507,6 +946,9 @@ static int sii902x_probe(struct i2c_client *client,
>  		return PTR_ERR(sii902x->reset_gpio);
>  	}
>  
> +	/* protect audio and video functions from each other */
> +	mutex_init(&sii902x->mutex);
> +
>  	sii902x_reset(sii902x);
>  
>  	ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
> @@ -547,6 +989,8 @@ 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,
> diff --git a/include/dt-bindings/sound/sii902x-audio.h b/include/dt-bindings/sound/sii902x-audio.h
> new file mode 100644
> index 000000000000..32e50a926b6f
> --- /dev/null
> +++ b/include/dt-bindings/sound/sii902x-audio.h
> @@ -0,0 +1,11 @@
> +#ifndef __DT_SII9022_AUDIO_H
> +#define __DT_SII9022_AUDIO_H
> +
> +#define ENABLE_BIT			0x80
> +#define CONNECT_SD0			0x00
> +#define CONNECT_SD1			0x10
> +#define CONNECT_SD2			0x20
> +#define CONNECT_SD3			0x30
> +#define LEFT_RIGHT_SWAP_BIT		0x04
> +
> +#endif /* __DT_SII9022_AUDIO_H */
kernel test robot Feb. 25, 2019, 9:44 p.m. | #2
Hi Jyri,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.0-rc8 next-20190225]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Jyri-Sarha/drm-bridge-sii902x-HDMI-audio-support-and-some-fixes/20190226-014705


coccinelle warnings: (new ones prefixed by >>)

>> drivers/gpu/drm/bridge/sii902x.c:569:2-3: Unneeded semicolon

Please review and possibly fold the followup patch.

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

Patch

diff --git a/Documentation/devicetree/bindings/display/bridge/sii902x.txt b/Documentation/devicetree/bindings/display/bridge/sii902x.txt
index 72d2dc6c3e6b..a1cff91e4e84 100644
--- a/Documentation/devicetree/bindings/display/bridge/sii902x.txt
+++ b/Documentation/devicetree/bindings/display/bridge/sii902x.txt
@@ -8,6 +8,21 @@  Optional properties:
 	- interrupts: describe the interrupt line used to inform the host 
 	  about hotplug events.
 	- reset-gpios: OF device-tree gpio specification for RST_N pin.
+	- i2s-fifo-routing: Array of exactly 4 integers indicating i2s
+	  pins for audio fifo routing. First integer defines routing to
+	  fifo 0 and second to fifo 1, etc. Integers can be filled with
+	  definitions from: include/dt-bindings/sound/sii902x-audio.h
+	  The available definitions are:
+	  - ENABLE_BIT:	enable this audio fifo
+	  - CONNECT_SD#: route audio input from SD0, SD1, SD2, or SD3 i2s
+			 data input pin
+	  - LEFT_RIGHT_SWAP_BIT: swap i2s input channels for this fifo
+	  I2S HDMI audio is configured only if this property is found.
+	- clocks: describes SII902x MCLK input. MCLK is used to produce
+	  HDMI audio CTS values. This property is required if
+	  "i2s-fifo-routing"-property is present. This property follows
+	  Documentation/devicetree/bindings/clock/clock-bindings.txt
+	  consumer binding.
 
 Optional subnodes:
 	- video input: this subnode can contain a video input port node
@@ -21,6 +36,15 @@  Example:
 		compatible = "sil,sii9022";
 		reg = <0x39>;
 		reset-gpios = <&pioA 1 0>;
+
+		i2s-fifo-routing = <
+			(ENABLE_BIT|CONNECT_SD0)
+			0
+			0
+			0
+		>;
+		clocks = <&mclk>;
+
 		ports {
 			#address-cells = <1>;
 			#size-cells = <0>;
diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
index 0e21fa419d27..f296a33c57c7 100644
--- a/drivers/gpu/drm/bridge/sii902x.c
+++ b/drivers/gpu/drm/bridge/sii902x.c
@@ -27,12 +27,16 @@ 
 #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>
+#include <dt-bindings/sound/sii902x-audio.h>
+
 #define SII902X_TPI_VIDEO_DATA			0x0
 
 #define SII902X_TPI_PIXEL_REPETITION		0x8
@@ -74,6 +78,77 @@ 
 #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 +156,16 @@ 
 
 #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 +175,12 @@  struct sii902x {
 	struct drm_connector connector;
 	struct gpio_desc *reset_gpio;
 	struct i2c_mux_core *i2cmux;
+	struct mutex mutex;
+	struct sii902x_audio {
+		struct platform_device *pdev;
+		struct clk *mclk;
+		u32 i2s_fifo_routing[4];
+	} audio;
 };
 
 static int sii902x_read_unlocked(struct i2c_client *i2c, u8 reg, u8 *val)
@@ -161,8 +252,12 @@  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 +279,8 @@  static int sii902x_get_modes(struct drm_connector *connector)
 	u8 output_mode = SII902X_SYS_CTRL_OUTPUT_DVI;
 	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 +294,19 @@  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;
 
-	return num;
+error_out:
+	mutex_unlock(&sii902x->mutex);
+
+	return ret;
 }
 
 static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
@@ -224,20 +326,28 @@  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,
@@ -263,26 +373,31 @@  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)
@@ -323,6 +438,329 @@  static const struct drm_bridge_funcs sii902x_bridge_funcs = {
 	.enable = sii902x_bridge_enable,
 };
 
+static int sii902x_mute(struct sii902x *sii902x, int mute)
+{
+	struct device *dev = &sii902x->i2c->dev;
+	int ret;
+
+	if (mute) {
+		dev_dbg(dev, "%s: Muted (%d)\n", __func__, mute);
+		ret = regmap_update_bits(sii902x->regmap,
+					 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
+					 SII902X_TPI_AUDIO_MUTE_ENABLE,
+					 SII902X_TPI_AUDIO_MUTE_ENABLE);
+	} else {
+		dev_dbg(dev, "%s: Unmuted (%d)\n", __func__, mute);
+		ret = regmap_update_bits(sii902x->regmap,
+					 SII902X_TPI_AUDIO_CONFIG_BYTE2_REG,
+					 SII902X_TPI_AUDIO_MUTE_ENABLE,
+					 SII902X_TPI_AUDIO_MUTE_DISABLE);
+	}
+	return ret;
+}
+
+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)
+{
+	int distance = 100000;
+	u8 i, nearest = 0;
+
+	for (i = 0; i < ARRAY_SIZE(sii902x_mclk_div_table); i++) {
+		unsigned int div = mclk / rate;
+
+		if (abs(div - sii902x_mclk_div_table[i]) < distance) {
+			nearest = i;
+			distance = abs(div - sii902x_mclk_div_table[i]);
+		}
+		if (div == sii902x_mclk_div_table[i])
+			break;
+	}
+
+	*i2s_config_reg |= nearest << 4;
+
+	if (i == ARRAY_SIZE(sii902x_mclk_div_table))
+		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;
+		}
+	}
+
+	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);
+
+	ret = clk_prepare_enable(sii902x->audio.mclk);
+	if (ret) {
+		dev_err(dev, "Enabling mclk failed: %d\n", ret);
+		return ret;
+	}
+
+	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; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_routing); i++)
+		regmap_write(sii902x->regmap,
+			     SII902X_TPI_I2S_ENABLE_MAPPING_REG,
+			     sii902x->audio.i2s_fifo_routing[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 i2s_fifo_defaults[] = {
+		SII902X_TPI_I2S_CONFIG_FIFO0,
+		SII902X_TPI_I2S_CONFIG_FIFO1,
+		SII902X_TPI_I2S_CONFIG_FIFO2,
+		SII902X_TPI_I2S_CONFIG_FIFO3,
+	};
+	struct hdmi_codec_pdata codec_data = {
+		.ops = &sii902x_audio_codec_ops,
+		.i2s = 1, /* Only i2s support for now. */
+		.spdif = 0,
+		.max_i2s_channels = 0,
+	};
+	int ret, i;
+
+	ret = of_property_read_u32_array(dev->of_node, "i2s-fifo-routing",
+					 sii902x->audio.i2s_fifo_routing,
+					 ARRAY_SIZE(sii902x->audio.i2s_fifo_routing));
+
+	if (ret != 0) {
+		if (ret == -EINVAL)
+			dev_dbg(dev, "%s: No \"i2s-fifo-routing\", no audio\n",
+			__func__);
+		else
+			dev_err(dev,
+				"%s: Error gettin \"i2s-fifo-routing\": %d\n",
+				__func__, ret);
+		return 0;
+	}
+
+	sii902x->audio.mclk = devm_clk_get(dev, NULL);
+	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;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(sii902x->audio.i2s_fifo_routing); i++) {
+		if (sii902x->audio.i2s_fifo_routing[i] | ENABLE_BIT)
+			codec_data.max_i2s_channels += 2;
+		sii902x->audio.i2s_fifo_routing[i] |= i2s_fifo_defaults[i];
+	}
+
+	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 },
 };
@@ -335,6 +773,7 @@  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,
 };
@@ -507,6 +946,9 @@  static int sii902x_probe(struct i2c_client *client,
 		return PTR_ERR(sii902x->reset_gpio);
 	}
 
+	/* protect audio and video functions from each other */
+	mutex_init(&sii902x->mutex);
+
 	sii902x_reset(sii902x);
 
 	ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
@@ -547,6 +989,8 @@  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,
diff --git a/include/dt-bindings/sound/sii902x-audio.h b/include/dt-bindings/sound/sii902x-audio.h
new file mode 100644
index 000000000000..32e50a926b6f
--- /dev/null
+++ b/include/dt-bindings/sound/sii902x-audio.h
@@ -0,0 +1,11 @@ 
+#ifndef __DT_SII9022_AUDIO_H
+#define __DT_SII9022_AUDIO_H
+
+#define ENABLE_BIT			0x80
+#define CONNECT_SD0			0x00
+#define CONNECT_SD1			0x10
+#define CONNECT_SD2			0x20
+#define CONNECT_SD3			0x30
+#define LEFT_RIGHT_SWAP_BIT		0x04
+
+#endif /* __DT_SII9022_AUDIO_H */