linux-kernel - Re: [PATCH v4 1/2] ASoC: dt-bindings: sound-card-common: List sound widgets ignoring system suspend

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Message-ID: <3242e162-bb0d-441c-af29-7c08e1f67d1f@sirena.org.uk>
Date:   Thu, 26 Oct 2023 19:11:22 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Chancel Liu <chancel.liu@....com>, lgirdwood@...il.com,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        shengjiu.wang@...il.com, Xiubo.Lee@...il.com, festevam@...il.com,
        nicoleotsuka@...il.com, perex@...ex.cz, tiwai@...e.com,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 1/2] ASoC: dt-bindings: sound-card-common: List sound
 widgets ignoring system suspend

On Thu, Oct 26, 2023 at 12:58:42PM -0500, Rob Herring wrote:
> On Mon, Oct 23, 2023 at 10:07:17AM +0800, Chancel Liu wrote:

> > Add a property to list audio sound widgets which are marked ignoring
> > system suspend. Paths between these endpoints are still active over
> > suspend of the main application processor that the current operating
> > system is running.

> Perhaps it would be better to define components used for low power 
> audio rather than the OS mode that gets used. Isn't LPA just audio 
> handling that doesn't require the OS CPU to be involved? So the state of 
> the CPU is kind of orthogonal.

Not really - you can have bypass paths that don't touch the AP but which
will have the power cut if the AP goes into suspend and it can be a
system integration decision which components that will be true for.
Often it's an inflexible PMIC/MCU setup managing the lowest system power
states.  The pure low power audio bit we should already be able to
figure out.

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