Re: [PATCH v7 09/33] ASoC: qdsp6: q6afe: Increase APR timeout

[Wesley Cheng]

Hi Mark,

On 9/27/2023 7:50 AM, Mark Brown wrote:
> On Thu, Sep 21, 2023 at 02:48:19PM -0700, Wesley Cheng wrote:
> > For USB offloading situations, the AFE port start command will result in a
> > QMI handshake between the Q6DSP and the main processor.  Depending on if
> > the USB bus is suspended, this routine would require more time to complete,
> > as resuming the USB bus has some overhead associated with it.  Increase the
> > timeout to 3s to allow for sufficient time for the USB QMI stream enable
> > handshake to complete.
>
> ...
>
> > -#define TIMEOUT_MS 1000
> > +#define TIMEOUT_MS 3000
>
> That seems worryingly large but if it's what the hardware/firmware needs
> I guess there's nothing doing - even the 1s that's being replaced would
> be nasty if we ever actually hit it.

I may have gone overkill with the delay, but when I measured the 
duration of the AFE start command it took ~1.5-2s.  It has to also 
account for the overhead within handling the USB QMI request in the 
qc_audio_offload driver.

Thanks
Wesley Cheng