[alsa-devel] [PATCH 2/3] ASoC: tlv320aic3x: Add delay after power on and register sync

[Peter Ujfalusi]

When the codec is powered on, it's registers are in reset state as the
power off will do a soft reset of the codec.

After the register sync we need to add delay to remove the pop-noise on
stream start.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi at ti.com>
---
 sound/soc/codecs/tlv320aic3x.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/soc/codecs/tlv320aic3x.c b/sound/soc/codecs/tlv320aic3x.c
index 7b6924e19021..bc220f83dd1f 100644
--- a/sound/soc/codecs/tlv320aic3x.c
+++ b/sound/soc/codecs/tlv320aic3x.c
@@ -1393,6 +1393,12 @@ static int aic3x_set_power(struct snd_soc_codec *codec, int power)
 			snd_soc_write(codec, AIC3X_PLL_PROGC_REG, pll_c);
 			snd_soc_write(codec, AIC3X_PLL_PROGD_REG, pll_d);
 		}
+
+		/*
+		 * Delay is needed to reduce pop-noise after syncing back the
+		 * registers
+		 */
+		mdelay(50);
 	} else {
 		/*
 		 * Do soft reset to this codec instance in order to clear
-- 
2.11.0