ASoC: tlv320dac33: Safety check for codec slave mode

The currently available FIFO modes (mode1 and mode7) require master
mode from the codec.
Do not allow the slave configuration when the FIFO is in use.
Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: NLiam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/tlv320dac33.c

@@ -993,6 +993,7 @@ static int dac33_set_dai_fmt(struct snd_soc_dai *codec_dai,
 			     unsigned int fmt)
 {
 	struct snd_soc_codec *codec = codec_dai->codec;
+	struct tlv320dac33_priv *dac33 = codec->private_data;
 	u8 aictrl_a, aictrl_b;
 
 	aictrl_a = dac33_read_reg_cache(codec, DAC33_SER_AUDIOIF_CTRL_A);
@@ -1005,7 +1006,11 @@ static int dac33_set_dai_fmt(struct snd_soc_dai *codec_dai,
 		break;
 	case SND_SOC_DAIFMT_CBS_CFS:
 		/* Codec Slave */
-		aictrl_a &= ~(DAC33_MSBCLK | DAC33_MSWCLK);
+		if (dac33->fifo_mode) {
+			dev_err(codec->dev, "FIFO mode requires master mode\n");
+			return -EINVAL;
+		} else
+			aictrl_a &= ~(DAC33_MSBCLK | DAC33_MSWCLK);
 		break;
 	default:
 		return -EINVAL;