linux-kernel - Re: [PATCH v2 6/8] ASoC: cs42l42: Add Soundwire support

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Message-ID: <c45d34ba-1aee-16aa-1ccf-79c43c8c4ed4@linux.intel.com>
Date:   Thu, 19 Jan 2023 10:27:21 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>,
        Stefan Binding <sbinding@...nsource.cirrus.com>,
        Mark Brown <broonie@...nel.org>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        patches@...nsource.cirrus.com
Subject: Re: [PATCH v2 6/8] ASoC: cs42l42: Add Soundwire support


>> You lost me here. Are you saying the soundwire bus clock is only known
>> in the prepare stage?
>>
> 
> hw_params() doesn't know the Soundwire bus clock so it can't do the
> check. We need to wait until we have both the sample rate and the
> chosen SWIRE_CLK.

Yes, makes sense. I forgot that all the stream management and bandwidth
allocation takes place in the prepare stage at the dailink level, and
the dai prepare happens after that. Thanks for the clarification.