[Sound-open-firmware] Question about PM sleep

[Sridharan, Ranjani]

On Fri, Mar 13, 2020 at 8:43 AM Daniel Baluta <daniel.baluta at gmail.com>
wrote:

> On Fri, Mar 13, 2020 at 5:34 PM Sridharan, Ranjani
> <ranjani.sridharan at intel.com> wrote:
> >
> >
> >
> > On Fri, Mar 13, 2020 at 8:30 AM Daniel Baluta <daniel.baluta at gmail.com>
> wrote:
> >>
> >> Hi Ranjani,
> >>
> >> While doing PM resume I get this warning message:
> >>
> >> root at imx8qxpmek:~# arecord -Dhw:0,0 -f S32_LE -r 48000 -c 2 z3.wav
> >> Recording WAVE 'z3.wav' : Signed 32 bit Little Endian, Rate 48000 Hz,
> Stereo
> >> Suspended. Trying resume. Failed. Restarting stream. Done.
> >>
> >> Any idea what could cause it? It is because my stream doesn't really
> support
> >> resume?
> >
> > Hi Daniel,
> >
> > This is the expected behavior in SOF and it was suggested by Takashi.
> Previously, we supported full resume in SOF, which meant that upon resuming
> from suspend, you would get only the TRIGGER_RESUME. But we needed to also
> get the prepare callback so that we could re-assign DMA stream tags upon
> resuming. This is why aplay indicates that the stream didnt resume but
> infact restarted from the previous position.
> >
> > Does this help?
>
> Indeed, it help. I will have a look at the discussion with Takashi.
>
Hi Daniel,

Here's the link to the discussion.
https://mailman.alsa-project.org/pipermail/alsa-devel/2019-April/147440.html

Thanks,
Ranjani