[PATCH RFC 1/4] ASoC: codec: hdmi-codec: Support IEC958 encoded PCM format

[Sia Jee Heng]

Existing hdmi-codec driver only support standard pcm format.
Support of IEC958 encoded format pass from ALSA IEC958 plugin is needed
so that the IEC958 encoded data can be streamed to the HDMI chip.

Signed-off-by: Sia Jee Heng <jee.heng.sia at intel.com>
---
 include/sound/hdmi-codec.h    | 5 +++++
 sound/soc/codecs/hdmi-codec.c | 4 +++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/sound/hdmi-codec.h b/include/sound/hdmi-codec.h
index b55970859a13..4b3a1d374b90 100644
--- a/include/sound/hdmi-codec.h
+++ b/include/sound/hdmi-codec.h
@@ -34,6 +34,11 @@ struct hdmi_codec_daifmt {
 	unsigned int frame_clk_inv:1;
 	unsigned int bit_clk_master:1;
 	unsigned int frame_clk_master:1;
+	/* bit_fmt could be standard PCM format or
+	 * IEC958 encoded format. ALSA IEC958 plugin will pass
+	 * IEC958_SUBFRAME format to the underneath driver.
+	 */
+	snd_pcm_format_t bit_fmt;
 };
 
 /*
diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-codec.c
index 0f3ac22f2cf8..422539f933de 100644
--- a/sound/soc/codecs/hdmi-codec.c
+++ b/sound/soc/codecs/hdmi-codec.c
@@ -489,6 +489,7 @@ static int hdmi_codec_hw_params(struct snd_pcm_substream *substream,
 	hp.sample_rate = params_rate(params);
 	hp.channels = params_channels(params);
 
+	cf->bit_fmt = params_format(params);
 	return hcp->hcd.ops->hw_params(dai->dev->parent, hcp->hcd.data,
 				       cf, &hp);
 }
@@ -617,7 +618,8 @@ static const struct snd_soc_dai_ops hdmi_codec_spdif_dai_ops = {
 			 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE |\
 			 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |\
 			 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |\
-			 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE)
+			 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE |\
+			 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
 
 static int hdmi_codec_pcm_new(struct snd_soc_pcm_runtime *rtd,
 			      struct snd_soc_dai *dai)
-- 
2.18.0