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Date:      Fri, 15 Jan 2021 15:28:33 +0000
From:      bugzilla-noreply@freebsd.org
To:        usb@FreeBSD.org
Subject:   [Bug 252712] Webcam does not work when attached to xhci(4) but does attached to ehci(4)
Message-ID:  <bug-252712-19105-Czdk6gYG1v@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-252712-19105@https.bugs.freebsd.org/bugzilla/>
References:  <bug-252712-19105@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D252712

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

           What    |Removed                     |Added
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                 CC|                            |hselasky@FreeBSD.org

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

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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