[PATCH v4 6/6] drm/bridge: sii902x: Implement HDMI audio support
Olivier MOYSAN
olivier.moysan at st.com
Thu Mar 14 15:44:39 UTC 2019
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 at 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(¶ms->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,
>
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