ASoC: nau8825: fix issue that pop noise when start capture

In skylake platform, we hear a loud pop noise(0 dB) at start of
audio capture power up sequence. This patch removes the pop noise
from the recording by adding a delay before enabling ADC.

Signed-off-by: Abhijeet Kumar <abhijeet.kumar@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c
index 714ce17da717c0edbc8817aa482dc1f2ec6fbcbe..e853a6dfd33b0ee7b8bf700dffea8b1e477f2d09 100644 (file)
--- a/sound/soc/codecs/nau8825.c
+++ b/sound/soc/codecs/nau8825.c
@@ -905,6 +905,7 @@ static int nau8825_adc_event(struct snd_soc_dapm_widget *w,
 
        switch (event) {
        case SND_SOC_DAPM_POST_PMU:
+               msleep(125);
                regmap_update_bits(nau8825->regmap, NAU8825_REG_ENA_CTRL,
                        NAU8825_ENABLE_ADC, NAU8825_ENABLE_ADC);
                break;