This is a note to let you know that I've just added the patch titled
ASoC: nau8825: fix issue that pop noise when start capture
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
asoc-nau8825-fix-issue-that-pop-noise-when-start-capture.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Feb 28 16:13:29 CET 2018
From: Abhijeet Kumar <abhijeet.kumar@xxxxxxxxx>
Date: Tue, 12 Dec 2017 00:40:25 +0530
Subject: ASoC: nau8825: fix issue that pop noise when start capture
From: Abhijeet Kumar <abhijeet.kumar@xxxxxxxxx>
[ Upstream commit d070f7c703ef26e3db613f24206823f916272fc6 ]
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@xxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/soc/codecs/nau8825.c | 1 +
1 file changed, 1 insertion(+)
--- a/sound/soc/codecs/nau8825.c
+++ b/sound/soc/codecs/nau8825.c
@@ -882,6 +882,7 @@ static int nau8825_adc_event(struct snd_
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;
Patches currently in stable-queue which might be from abhijeet.kumar@xxxxxxxxx are
queue-4.9/asoc-nau8825-fix-issue-that-pop-noise-when-start-capture.patch