linux-kernel - Re: [PATCH 5.3 204/344] SoC: simple-card-utils: set 0Hz to sysclk when shutdown

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Date:   Thu, 3 Oct 2019 18:28:49 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Katsuhiro Suzuki <katsuhiro@...suster.net>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.3 204/344] SoC: simple-card-utils: set 0Hz to sysclk
 when shutdown

On Thu, Oct 03, 2019 at 05:52:49PM +0200, Greg Kroah-Hartman wrote:
> From: Katsuhiro Suzuki <katsuhiro@...suster.net>
> 
> [ Upstream commit 2458adb8f92ad4d07ef7ab27c5bafa1d3f4678d6 ]
> 
> This patch set 0Hz to sysclk when shutdown the card.
> 
> Some codecs set rate constraints that derives from sysclk. This
> mechanism works correctly if machine drivers give fixed frequency.
> 
> But simple-audio and audio-graph card set variable clock rate if
> 'mclk-fs' property exists. In this case, rate constraints will go
> bad scenario. For example a codec accepts three limited rates
> (mclk / 256, mclk / 384, mclk / 512).

This is a new feature which seems out of scope for stable - I thought
I'd raised this already?

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