[Bug 252712] Webcam does not work when attached to xhci(4) but does attached to ehci(4)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252712

            Bug ID: 252712
           Summary: Webcam does not work when attached to xhci(4) but does
                    attached to ehci(4)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: usb
          Assignee: usb at FreeBSD.org
          Reporter: nwhitehorn at FreeBSD.org

I have a Logitech C925e webcam. When attached to the onboard xhci(4) controller
(AMD 300 Series USB 3.0 controller), it does not provide any picture through
webcamd, though does turn on. Data are clearly transferred, as the interrupt
rate goes up dramatically when running pwcview. If I set uvc_driver.nodrop=1 in
webcamd, I can see a small top portion of each frame, which gets smaller at
higher resolution, suggesting that the transfers are being truncated after some
number of bytes.

If I install an ehci(4)-based PCI card and plug the webcam into that instead,
everything works perfectly without tweaks.

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