[PATCH 1/2] ASoC: mt6359: skip first time data at the beginning of DMIC recording

[Jiaxin Yu]

On Mon, 2020-10-26 at 12:33 +0000, Mark Brown wrote:
> On Sat, Oct 24, 2020 at 02:41:25PM +0800, Jiaxin Yu wrote:
> > We can choose to drop away any length of data from the beginning according
> > to project needs. Some projects don't want to throw away any data, because
> > they want to use recorded data to do echo cancellation, so they have to
> > make sure that they are aligned with the reference data as much as
> > possible. Or there are other algorithms in the upper layer to eliminate
> > this noise. Or some projects want to eliminate this noise form the kernel
> > layer. However, the minimum recommended value is 50ms to skip pop noise.
> 
> This seems like something that would apply equally to all DMICs so
> should be done at a more general level rather than in this specific
> driver, for example it could be done in the DMIC driver.

Hi Brown,

So you suggest that we use sound/soc/codecs/dmic.c to control the delay
after recording?
If so, should we add one more CODEC('dmic-codec' and 'dmic-hifi') to
dmic's dai-link? It looks link dmic.c has helped us do something to
control dmics.