linux-kernel - Re: [PATCH 04/12] ASoC: cs42l42: Don't reconfigure the PLL while it is running

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Message-ID: <b244d737-ae0d-2566-d909-c2264a2668ec@opensource.cirrus.com>
Date:   Wed, 11 Aug 2021 11:56:34 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     Mark Brown <broonie@...nel.org>
CC:     <alsa-devel@...a-project.org>, <patches@...nsource.cirrus.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/12] ASoC: cs42l42: Don't reconfigure the PLL while it
 is running

On 10/08/2021 16:49, Mark Brown wrote:
> On Tue, Aug 10, 2021 at 04:37:51PM +0100, Richard Fitzgerald wrote:
>> cs42l42_pcm_hw_params() must only configure the PLL if this is the first
>> stream to become active, otherwise it will be overwriting the registers
>> while the PLL is running.
> 
> Shouldn't the PLL code be noticing problematic attempts to reconfigure
> the PLL while it's active rather than the individual callers?
> 

I'll push a new version with cs42l42_pll_config() doing the check.