[PATCH 0/8] ASoC: SOF: power optimizations for HDaudio platforms

[Pierre-Louis Bossart]

> Perhaps, it may be acceptable to add a global control enum (to the control
> API) for the ALSA card which may modify the driver behaviour / settings at
> runtime (normal operation, battery saving operation etc.). This control can be
> set in the UCM config. In this way, we don't need to touch the PCM API for the
> user space at all.

If there was a mechanism based on ALSA controls for an application to 
query capabilities and set what it want to disable that would be fine. 
hwdep would be fine as well.

I don't get though how this could be 'set in the UCM config', different 
apps might have different needs. UCM files don't currently make 
assumptions on which application uses them, do they?