Re: [RFC PATCH 03/14] ASoC: qcom: Add USB backend ASoC driver for Q6

Mark Brown
2022-12-27T14:12:16Z

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On Tue, Dec 27, 2022 at 03:02:31PM +0100, Takashi Iwai wrote:
> Greg KH wrote:
> > On Tue, Dec 27, 2022 at 01:04:55PM +0000, Mark Brown wrote:
> > > On Sat, Dec 24, 2022 at 10:02:59AM +0100, Greg KH wrote:

> > > > "be"? What is that?

> > > Back end. This is a concept in DPCM which should be reasonably
> > > discoverable to people working on the audio portions of this code.

> > Ok, then how is the reference counting logic handled here? USB devices
> > can be removed from the system at any point in time...

> The whole picture is fairly complex, and this patch is a part
> belonging to the ASoC machine driver -- that is, it's bound to the
> Qualcomm host, and there can be only one on a system.

> OTOH, USB audio devices are still managed by the existing USB audio
> driver as is, and they can be multiple and any devices. The basic
> idea here is a hijack of the USB data processing in USB audio driver
> with the offloading mechanism by this ASoC driver (only if the
> condition met).

Right. I haven't even begun to look at the actual code here, just
triaging my inbox, so I've got no thoughts on if things work or not.

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