[PATCH 2/2] ASoC: wm8974: remove unsupported clock mode

[puyou.lu at gmail.com]

From: Puyou Lu <puyou.lu at gmail.com>

In DSP_A mode, BIT7 of IFACE should bit 0 according to datasheet (ie.
inverted frame clock is not support in this mode).

Signed-off-by: Puyou Lu <puyou.lu at gmail.com>
---
 sound/soc/codecs/wm8974.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/codecs/wm8974.c b/sound/soc/codecs/wm8974.c
index 764bf93..7cfc896 100644
--- a/sound/soc/codecs/wm8974.c
+++ b/sound/soc/codecs/wm8974.c
@@ -474,6 +474,10 @@ static int wm8974_set_dai_fmt(struct snd_soc_dai *codec_dai,
 		iface |= 0x0008;
 		break;
 	case SND_SOC_DAIFMT_DSP_A:
+		if ((fmt & SND_SOC_DAIFMT_INV_MASK) == SND_SOC_DAIFMT_IB_IF ||
+		    (fmt & SND_SOC_DAIFMT_INV_MASK) == SND_SOC_DAIFMT_NB_IF) {
+			return -EINVAL;
+		}
 		iface |= 0x00018;
 		break;
 	default:
-- 
2.7.4