ASoC: davinci-mcasp: Add support for I2S format

The FS needs to be inverted in McASP compared to other supported formats.
Use a flag to indicate if the FS needs to be inverted.
At the same time fail when non supported format is asked since the default
case was anyways configuring McASP to a not valid format.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 10 insertions, 1 deletions

diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index 113e74c9479f..d4d640004bed 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -273,6 +273,7 @@ static int davinci_mcasp_set_dai_fmt(struct snd_soc_dai *cpu_dai,
         int ret = 0;
         u32 data_delay;
         bool fs_pol_rising;
+        bool inv_fs = false;
 
         pm_runtime_get_sync(mcasp->dev);
         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
@@ -291,14 +292,19 @@ static int davinci_mcasp_set_dai_fmt(struct snd_soc_dai *cpu_dai,
                 /* No delay after FS */
                 data_delay = 0;
                 break;
-        default:
+        case SND_SOC_DAIFMT_I2S:
                 /* configure a full-word SYNC pulse (LRCLK) */
                 mcasp_set_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, FSXDUR);
                 mcasp_set_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG, FSRDUR);
 
                 /* 1st data bit occur one ACLK cycle after the frame sync */
                 data_delay = 1;
+                /* FS need to be inverted */
+                inv_fs = true;
                 break;
+        default:
+                ret = -EINVAL;
+                goto out;
         }
 
         mcasp_mod_bits(mcasp, DAVINCI_MCASP_TXFMT_REG, FSXDLY(data_delay),
@@ -379,6 +385,9 @@ static int davinci_mcasp_set_dai_fmt(struct snd_soc_dai *cpu_dai,
                 goto out;
         }
 
+        if (inv_fs)
+                fs_pol_rising = !fs_pol_rising;
+
         if (fs_pol_rising) {
                 mcasp_clr_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, FSXPOL);
                 mcasp_clr_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG, FSRPOL);