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.