[PATCH] ALSA: hda/hdmi: Add Intel silent stream support

[Kai Vehmanen]

Hey,

On Wed, 24 Jun 2020, Takashi Iwai wrote:

> So, rather the question is how we should provide the setup of such
> parameter.  It's supposed to be a part of power management stuff that
> should be touched by either a smart PM tool or a manual override such
> as runtime PM setup?  Or can it be seen as a more casual tuning?

this is fairly similar to "power_save" parameter (which has a default set 
via Kconfig). Enabling silent streaming comes at a power consumption cost 
as you will keep the audio controller powered up whenever a HDMI/DP 
receiver is connected (but you can get rid of the startup delay for audio 
that can be annoying for short audio clips like UI sounds).

So depends mostly on the type of product. I'd expect system integrators 
who are used to modify "power_save", to also modify the default for 
silent_stream enable config. So in that sense using similar interface to 
expose the feature makes sense (so the people most likely to use the 
interface, are already familiar with it).

Br, Kai