[Sound-open-firmware] Question about PM sleep

[Daniel Baluta]

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.

thanks,
Daniel