ASoC: AMD: Clear format bits before setting them

This avoids residual bit form previous format when the format is changed.
Hence, the resultant format is not an invalid one.

Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
Signed-off-by: Ravulapati Vishnu vardhan rao <Vishnuvardhanrao.Ravulapati@amd.com>
Link: https://lore.kernel.org/r/20200328093921.32211-1-akshu.agrawal@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/raven/acp3x-i2s.c

@@ -139,6 +139,7 @@ static int acp3x_i2s_hwparams(struct snd_pcm_substream *substream,
 		rv_writel(adata->tdm_fmt, rtd->acp3x_base + frmt_reg);
 	}
 	val = rv_readl(rtd->acp3x_base + reg_val);
+	val &= ~ACP3x_ITER_IRER_SAMP_LEN_MASK;
 	val = val | (rtd->xfer_resolution  << 3);
 	rv_writel(val, rtd->acp3x_base + reg_val);
 	return 0;

sound/soc/amd/raven/acp3x.h

@@ -76,6 +76,8 @@
 #define ACP_POWERED_OFF			0x02
 #define ACP_POWER_OFF_IN_PROGRESS	0x03
 
+#define ACP3x_ITER_IRER_SAMP_LEN_MASK	0x38
+
 struct acp3x_platform_info {
 	u16 play_i2s_instance;
 	u16 cap_i2s_instance;