kern/55574: USB video class webcam (uvideo(4)) does not work with xhci(4)

[ryo%tetera.org@localhost]

>Number:         55574
>Category:       kern
>Synopsis:       USB video class webcam (uvideo(4)) does not work with xhci(4)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 14 08:15:01 +0000 2020
>Originator:     Ryo ONODERA
>Release:        NetBSD 9.99.70
>Organization:
Ryo ONODERA // ryo%tetera.org@localhost
PGP fingerprint = 82A2 DC91 76E0 A10A 8ABB  FD1B F404 27FA C7D1 15F3
>Environment:
	
	
System: NetBSD brownie 9.99.70 NetBSD 9.99.70 (GENERIC) #1: Fri Aug 14 10:18:30 JST 2020 ryoon@brownie:/usr/world/9.99/amd64/obj/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:
	
I have Logitech's Webcam C300 webcam that supports USB video class.
This device works correctly with echo(4), however it does not work
with xhci(4).

>How-To-Repeat:
	
(1) Install pkgsrc/multimedia/mplater.
(2) Connect uvideo(4) webcam to USB socket.
(3) Run 'mplayer tv://'
(4-1) With xhci(4), you can get a screen filled with green pixels.
(4-2) With ehci(4), you can get a scene captured by the webcam.

>Fix:
	
I have no idea.

>Unformatted: