[alsa-devel] [PATCH] ASoC: da7219: check SRM lock in trigger callback

[Mark Brown]

On Mon, Feb 10, 2020 at 04:16:51PM +0800, Brent Lu wrote:

> Intel sst firmware turns on BCLK/WCLK in START Ioctl call which timing is
> later than the DAPM SUPPLY event handler da7219_dai_event is called (in
> PREPARED state). Therefore, the SRM lock check always fail.
> 
> Moving the check to trigger callback could ensure the SRM is locked before
> DSP starts to process data and avoid possisble noise.

Independently of any other discussion trigger is expected to run very
fast so doesn't feel like a good place to do this - given that we're
talking about doing this to avoid noise the mute operation seems like a
more idiomatic place to do this, it exists to avoid playing back
glitches from the digitial interface during startup.
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