[alsa-devel] [PATCH BAT V1 0/7] BAT: Add Basic Audio Tester command line tool

[Liam Girdwood]

On Thu, 2015-09-17 at 06:29 -0700, Caleb Crome wrote:
> >> > We have also used BAT for stress testing audio over D0 -> D3 -> D0 transitions.
> >>
> >> Sorry, I'm not familiar with that terminology.  Are those the
> >> different power states?
> >
> > Yes, PM suspend and resume of device. We have some scripts (to be
> > upstreamed later) that would play audio, suspend the device, resume the
> > device and then retest the audio.
> 
> That seems particularly likely to result in multiple codecs getting
> out of phase alignment.  i.e. when restarting, you want to be sure to
> follow the same startup procedure as the first time to make sure all
> codecs are aligned.
> 

This was more for testing our DSP and codec context was properly
saved/restored and also our codec was properly powered down/up during PM
state changes.

Liam