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Diffstat (limited to 'sound/soc/davinci/davinci-i2s.c')
-rw-r--r--sound/soc/davinci/davinci-i2s.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c
index 81ff5c37ab56..156e3e95d914 100644
--- a/sound/soc/davinci/davinci-i2s.c
+++ b/sound/soc/davinci/davinci-i2s.c
@@ -235,18 +235,45 @@ static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_IB_NF:
+ /* CLKRP Receive clock polarity,
+ * 1 - sampled on rising edge of CLKR
+ * valid on rising edge
+ * CLKXP Transmit clock polarity,
+ * 1 - clocked on falling edge of CLKX
+ * valid on rising edge
+ * FSRP Receive frame sync pol, 0 - active high
+ * FSXP Transmit frame sync pol, 0 - active high
+ */
w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_CLKXP |
DAVINCI_MCBSP_PCR_CLKRP, 1);
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
break;
case SND_SOC_DAIFMT_NB_IF:
+ /* CLKRP Receive clock polarity,
+ * 0 - sampled on falling edge of CLKR
+ * valid on falling edge
+ * CLKXP Transmit clock polarity,
+ * 0 - clocked on rising edge of CLKX
+ * valid on falling edge
+ * FSRP Receive frame sync pol, 1 - active low
+ * FSXP Transmit frame sync pol, 1 - active low
+ */
w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_FSXP |
DAVINCI_MCBSP_PCR_FSRP, 1);
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
break;
case SND_SOC_DAIFMT_IB_IF:
+ /* CLKRP Receive clock polarity,
+ * 1 - sampled on rising edge of CLKR
+ * valid on rising edge
+ * CLKXP Transmit clock polarity,
+ * 1 - clocked on falling edge of CLKX
+ * valid on rising edge
+ * FSRP Receive frame sync pol, 1 - active low
+ * FSXP Transmit frame sync pol, 1 - active low
+ */
w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_CLKXP |
DAVINCI_MCBSP_PCR_CLKRP |
@@ -255,6 +282,15 @@ static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
break;
case SND_SOC_DAIFMT_NB_NF:
+ /* CLKRP Receive clock polarity,
+ * 0 - sampled on falling edge of CLKR
+ * valid on falling edge
+ * CLKXP Transmit clock polarity,
+ * 0 - clocked on rising edge of CLKX
+ * valid on falling edge
+ * FSRP Receive frame sync pol, 0 - active high
+ * FSXP Transmit frame sync pol, 0 - active high
+ */
break;
default:
return -EINVAL;