From: Abhijeet Kumar <abhijeet.kumar@intel.com>
Date: Mon, 11 Dec 2017 19:10:25 +0000 (+0530)
Subject: ASoC: nau8825: fix issue that pop noise when start capture
X-Git-Tag: v4.19~1839^2~17^2~1^3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d070f7c703ef26e3db613f24206823f916272fc6;p=platform%2Fkernel%2Flinux-rpi.git

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 714ce17..e853a6d 100644
--- 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;