[PATCH RFC 2/4] drm: bridge: adv7511: Support I2S IEC958 encoded PCM format

[Sia Jee Heng]

Support IEC958 encoded PCM format for ADV7511 so that ADV7511 HDMI
audio driver can accept the IEC958 data from the I2S input.

Signed-off-by: Sia Jee Heng <jee.heng.sia at intel.com>
---
 drivers/gpu/drm/bridge/adv7511/adv7511.h       | 1 +
 drivers/gpu/drm/bridge/adv7511/adv7511_audio.c | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511.h b/drivers/gpu/drm/bridge/adv7511/adv7511.h
index a9bb734366ae..05e3abb5a0c9 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511.h
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511.h
@@ -191,6 +191,7 @@
 #define ADV7511_I2S_FORMAT_I2S			0
 #define ADV7511_I2S_FORMAT_RIGHT_J		1
 #define ADV7511_I2S_FORMAT_LEFT_J		2
+#define ADV7511_I2S_IEC958_DIRECT		3
 
 #define ADV7511_PACKET(p, x)	    ((p) * 0x20 + (x))
 #define ADV7511_PACKET_SDP(x)	    ADV7511_PACKET(0, x)
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_audio.c b/drivers/gpu/drm/bridge/adv7511/adv7511_audio.c
index 45838bd08d37..61f4a38e7d2b 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_audio.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_audio.c
@@ -101,6 +101,10 @@ static int adv7511_hdmi_hw_params(struct device *dev, void *data,
 	case 20:
 		len = ADV7511_I2S_SAMPLE_LEN_20;
 		break;
+	case 32:
+		if (fmt->bit_fmt != SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
+			return -EINVAL;
+		fallthrough;
 	case 24:
 		len = ADV7511_I2S_SAMPLE_LEN_24;
 		break;
@@ -112,6 +116,8 @@ static int adv7511_hdmi_hw_params(struct device *dev, void *data,
 	case HDMI_I2S:
 		audio_source = ADV7511_AUDIO_SOURCE_I2S;
 		i2s_format = ADV7511_I2S_FORMAT_I2S;
+		if (fmt->bit_fmt == SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
+			i2s_format = ADV7511_I2S_IEC958_DIRECT;
 		break;
 	case HDMI_RIGHT_J:
 		audio_source = ADV7511_AUDIO_SOURCE_I2S;
-- 
2.18.0