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

[bugzilla-noreply at freebsd.org]

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

Hans Petter Selasky <hselasky at FreeBSD.org> changed:

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                 CC|                            |hselasky at FreeBSD.org

--- Comment #1 from Hans Petter Selasky <hselasky at FreeBSD.org> ---
It is likely a bug regarding the bandwidth allocation for XHCI ISOCH endpoints.

When we setup an endpoint context we need to fill in some parameters to tell
the hardware how many bytes to reserve. Likely these are wrong:

Refer to:

XHCI_EPCTX_4_MAX_ESIT_PAYLOAD_SET(max_frame_size)

in xhci.c

Maybe you can play with the parameter.

--HPS

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