[alsa-devel] [PATCH 7/8] ALSA: pcm: Add card sync_irq field

[Ranjani Sridharan]

On Mon, 2019-11-18 at 21:40 +0100, Takashi Iwai wrote:
> On Mon, 18 Nov 2019 20:55:19 +0100,
> Sridharan, Ranjani wrote:
> > 
> >     > Thanks for the clarification, Takashi. But just wondering how
> > would one
> >     pass
> >     > on the sync_irq when the snd_card is created? Typically in
> > the case of
> >     the
> >     > Intel platforms, the card->dev points to the platform device
> > for the
> >     machine
> >     > driver that registers the card and the PCI device is the
> > parent of the
> >     machine
> >     > drv platform device. 
> >    
> >     It's completely up to the driver implementation :)
> >     You can implement the own sync_stop ops if that's easier, too.
> > 
> > I think this would make sense in the case of the SOF driver and
> > we'd probably
> > need to just call synchronize_irq() in the sync_stop() operation.
> > With this
> > change, we can probably remove the workaround we have to address
> > the issue we
> > were facing during snd_pcm_period_elapsed(). 
> > 
> > I can give this a try. We might need to run some stress tests to
> > make sure it
> > doesn't break anything. 
> 
> If this helps for SOF, it'd be great.  I have converted only non-ASoC
> drivers regarding the sync-stop stuff, so it won't conflict my
> upcoming changes :)
> 
Hi Takashi,

I just realized that In the SOF driver, we only set the component
driver ops. The pcm ops are set when creating the new pcm. So, should I
also add the sync_stop op in the component driver and set the pcm
sync_stop op to point to the component sync_stop op? Just wanted to
confirm if I am on the right track.

Thanks,
Ranjani