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SubjectRe: [PATCH AUTOSEL for 4.14 029/110] ASoC: nau8825: fix issue that pop noise when start capture
On Mon, Feb 05, 2018 at 11:41:54AM +0000, Mark Brown wrote:
>On Sat, Feb 03, 2018 at 06:00:42PM +0000, Sasha Levin wrote:
>> From: Abhijeet Kumar <>
>> [ 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.
>> switch (event) {
>> + msleep(125);
>> regmap_update_bits(nau8825->regmap, NAU8825_REG_ENA_CTRL,
>This is another one of these where I'm not convinced that backporting to
>stable isn't going to introduce regressions - it will fix problems on
>some systems but if someone really cares about a startup pop and has
>arranged to do something like discard the start of the audio where the
>pop occurs then this may cut off even more and cause them to miss

It might cause regressions for users who worked around the issue, but it
may also fix the issue for users who didn't. I think that in general
we'd rather have mainline and stable trees have the same bugs and
breakage - we don't want surprises when users jump around between


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