Re: [PATCH 0/4] ASoC: fsl_asrc: allow selecting arbitrary clocks

Mark Brown
2020-07-16T12:19:36Z

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On Wed, Jul 15, 2020 at 02:03:08PM -0700, Nicolin Chen wrote:
> On Wed, Jul 15, 2020 at 03:05:19PM +0100, Mark Brown wrote:
> > On Tue, Jul 14, 2020 at 01:50:50PM -0700, Nicolin Chen wrote:

> > > Thanks for the input. Fox i.MX6, I don't feel it would be that
> > > drastically different though. And both SSI1 and SSI2 can simply
> > > select the same root clock source to avoid that happen.

> > If you've got two radios that both need to sync to some radio derived
> > frequency it gets a bit more entertaining.

> I'm simply curious what could be a problem. Do you mind educating
> me a bit? And ASRC here isn't a radio but a sample rate converter
> working as a BE in DPCM setup, using radio-capture for example...

My understanding was that this application was using the ASRC to convert
between the sample rates of two different radios - the rates may be
nominaly the same but in practice different so the audio will glitch
after a while when the clocks drift far enough apart.

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