On Sat, Jul 25, 2020 at 1:24 PM Pavel Hofman <pavel.hofman@xxxxxxxxxxx> wrote: > > > Dne 22. 07. 20 v 17:25 harrison conroy napsal(a): > > Hi Ruslan, > > > > I am working on a project that involves using an RPi 4 as a USB Gadget > > and we have run into the feedback endpoint issue causing Windows 10 to > > not recognize it as a USB audio device. Do you have any updates on this > > patch for the community? Any help would be greatly appreciated. > > As a temporary workaround you can change the EP OUT type from > USB_ENDPOINT_SYNC_ASYNC to USB_ENDPOINT_SYNC_ADAPTIVE. > > Or you can add implicit feedback flag to the EP IN. Win10 should handle > implicit feedback OK, unlike Win7. Unfortunately linux still requires an > explicit quirk for the implicit feedback > https://www.spinics.net/lists/alsa-devel/msg111824.html . Yet it is > still a workaround because IMO the existing EP IN is in fact not async > but adaptive, clocked by the USB frames. > There is a commit which I've sent earlier this month which is a part of Win10 enumeration solution: https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git/commit/?h=next&id=a9cf8715180b18c62addbfe6f6267b8101903119 For the rest of the solution (feedback endpoint implementation) I'm refreshing patches on top of this, and expect to submit them very soon Thanks, Ruslan
