ASoC: codecs: ad193x: Fix frame polarity for DSP_A format

By default, the codec starts to interpret the left (first) channel on
the falling edge (low polarity) of LRCLK. However, for DSP_A, the left
channel needs to start on the rising edge of LRCLK. This patch fixes
this channel swap by toggling the bit which selects the LRCLK polarity.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/ad193x.c b/sound/soc/codecs/ad193x.c
index c16c9969d1a06698a5abdb507b4b5d656513f54c..315ec977511802453cd67680d9bc608dd8df6886 100644 (file)
--- a/sound/soc/codecs/ad193x.c
+++ b/sound/soc/codecs/ad193x.c
@@ -228,6 +228,12 @@ static int ad193x_set_dai_fmt(struct snd_soc_dai *codec_dai,
                return -EINVAL;
        }
 
+       /* For DSP_*, LRCLK's polarity must be inverted */
+       if (fmt & SND_SOC_DAIFMT_DSP_A) {
+               change_bit(ffs(AD193X_DAC_LEFT_HIGH) - 1,
+                          (unsigned long *)&dac_fmt);
+       }
+
        switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
        case SND_SOC_DAIFMT_CBM_CFM: /* codec clk & frm master */
                adc_fmt |= AD193X_ADC_LCR_MASTER;