On Tue, 27 Dec 2022 14:45:13 +0100, 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: > > > On Fri, Dec 23, 2022 at 03:31:49PM -0800, Wesley Cheng wrote: > > > > > > + * struct q6usb_offload > > > > + * @dev - dev handle to usb be > > > > > "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). thanks, Takashi
