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

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Message-ID: <20200716121821.GA5105@sirena.org.uk>
Date:   Thu, 16 Jul 2020 13:18:21 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     Arnaud Ferraris <arnaud.ferraris@...labora.com>,
        alsa-devel@...a-project.org, Timur Tabi <timur@...nel.org>,
        Xiubo Li <Xiubo.Lee@...il.com>, linux-kernel@...r.kernel.org,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>, kernel@...labora.com,
        Fabio Estevam <festevam@...il.com>
Subject: Re: [PATCH 0/4] ASoC: fsl_asrc: allow selecting arbitrary clocks

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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