Re: usb3.0: dwc3: isoc: missisoc while setting the USB transfer UVC data

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, Jun 10, 2021 at 07:33:43PM +0800, kun peng wrote:
> On Thu, Jun 10, 2021 at 6:07 PM Felipe Balbi <balbi@kernel.org> wrote:
> >
> > Hi,
> >
> > kun peng <kunpeng0891@gmail.com> writes:
> > > Hi ， I'm using the 4*A53 with DWC3 USB controller, my hardware to work
> > > like a USB camera and so make use of the USB 3.0 UVC gadget driver。
> > > usb3.0 isoc transfer with  missisoc -18，larger maxburst is set, the
> > > more -18 appears。
> > > but from trace info, the trb has been put in advance。
> > >
> > > test setting:
> > > dwc3 driver version：5.12
> > > PC： potplayer
> > >
> > > maxpacket : 3072
> > > maxburst : 15
> > > interval : 1
> > > UVC_NUM_REQUESTS: 8
> >
> > sorry, you're running 4.14.74 kernel. That's far too old for this forum
> > to help you. Try reproducing with the latest v5.13-rc kernel.
> >
> > --
> > balbi
> 
> thanks for your reply.
> 
> my kernel is 4.14, but usb and uvc related driver has been update to
> 5.12.0 linux main line.

That will not work, you have to update the whole kernel at once, drivers
can not be picked and choosen from different kernel trees and expect to
work at all, sorry.

Please try 5.12 or as Felipe said, the latest 5.13-rc release and let us
know if that works or not.

thanks,

greg k-h