kern/51241: USB Drive detect failure on Tegra K1

[cyber%netbsd.org@localhost]

>Number:         51241
>Category:       kern
>Synopsis:       USB Drive detect failure on Tegra K1
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 14 23:35:00 +0000 2016
>Originator:     Erik Berls
>Release:        NetBSD armv7 7.99.30 NetBSD 7.99.30 (TEGRA.201606011320Z) evbarm
>Organization:
NetBSD
>Environment:
NetBSD armv7 7.99.30 NetBSD 7.99.30 (TEGRA) #3: Thu Jun  2 23:36:05 UTC 2016  root@armv7:/home/netbsd-src/src/sys/arch/evbarm/compile/obj/TEGRA evbarm

>Description:
Plugging in a USB drive into a TEGRA K1 fails to probe.

dmesg: ftp://ftp.netbsd.org:/pub/NetBSD/misc/cyber/TEGRA-USB/dmesg.txt
usbhist: ftp://ftp.netbsd.org:/pub/NetBSD/misc/cyber/TEGRA-USB/usbhist.txt

>How-To-Repeat:
1. Boot Tegra
2. Plug in USB drive (In this case a WD My Book, 5TB, also tested with 2TB My Passport)
3. Note that it spits out some kernel messages but doesn't attach.

Full dmesg and vmstat -u usbhist available via ftp (see above).

>Fix: