Re: [PATCH 0/3] [RESEND] ASoC: SOF: preparatory patches

[Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>]

On Thu, Mar 12, 2020 at 12:15:49PM +0000, Mark Brown wrote:
> On Thu, Mar 12, 2020 at 12:45:37PM +0100, Guennadi Liakhovetski wrote:
> > On Tue, Mar 10, 2020 at 12:50:56PM +0000, Mark Brown wrote:
> 
> > > How does this relate to the virtio audio spec that's currently under
> > > review?
> 
> > The spec under discussion is only for simple audio virtualisation with fixed 
> > roles and topologies. With our approach guests get access to advanced DSP 
> > capabilities. The virtualisation approach under discussion can be a fallback 
> > for cases when no DSP has been detected on the host.
> 
> So they're orthogonal :/  Have you proposed your spec yet?
> 
> > > It looks to be doing something much lower level than that.
> > > I am concerned that this looks to be exposing DPCM as a virtio ABI,
> > > we're trying to replace it as an internal API never mind ABI.
> 
> > You mean that our approach works at the widget level, which is a part of the 
> > DPCM API? Well there is a translation layer between our ABI and DPCM. And by 
> > virtue of the same argument don't we already have DPCM as an ABI on the 
> > opposite side of SOF - in its IPC ABI? Largely this virtualisation approach 
> > doesn't add new interfaces, it re-uses the SOF IPC ABI, which is also one of 
> > its advantages.
> 
> Please bear in mind that the page you linked to is very high level and
> I've not seen the actual spec or anything.  The page and your mails both
> talk about DPCM so it sounds like that's a part of the interface.

Let me rebase my current stack and post it here, stay tuned :-)

Thanks
Guennadi