ASoC: nau8540: fix the record pop noise

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When the record starts, the driver turns on MICBIAS and the voltage is
pulled up for an instant. If the receiver starts to capture the signal
between the instant, there is an pop noise in the stream beginning.
To avoid the pop noise, the driver makes a delay in the sequence.
After MICBIAS powered up, the driver waits 300 ms for the voltage
going down. Then turns on the ADC output, and sends signal to receiver.
The pop noise can be erased.

Signed-off-by: John Hsu <KCHSU0@nuvoton.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

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John Hsu 2017-11-07 15:23:19 +08:00 • committed by Mark Brown

parent 14323ff8c2

commit 6573c0510b

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2 changed files with 41 additions and 8 deletions

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47

sound/soc/codecs/nau8540.c

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2

sound/soc/codecs/nau8540.h

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