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

Mark Brown broonie at kernel.org
Fri Oct 27 05:11:22 AEDT 2023

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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