i386/152075: Add quirk for CS5536 USB

[Anselm Strauss]

>Number:         152075
>Category:       i386
>Synopsis:       Add quirk for CS5536 USB
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Nov 09 12:50:05 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Anselm Strauss
>Release:        8.1
>Organization:
>Environment:
FreeBSD oblivion.l.ttyv0.net 8.1-RELEASE-p1 FreeBSD 8.1-RELEASE-p1 #0: Sun Oct  3 18:41:14 CEST 2010     root at hulk.l.ttyv0.net:/usr/obj/i386/usr/src/sys/ALIX  i386
>Description:
The USB chip included in CS5536 needs hw.usb.ehci.lostintrbug set to 1 in sysctl. Otherwise it will run into timeouts e.g. on disk I/O and abort with failed I/O operations. The corresponding conversation is on the FreeBSD USB mailing list:

http://lists.freebsd.org/pipermail/freebsd-usb/2010-October/009367.html
>How-To-Repeat:
Connect a USB disk, read the whole disk with dd.
>Fix:
The sysctl setting should be set automatically. The bug and the connection to the sysctl workaround is not easy to find. Maybe someone knows how to add a quirk to sys/dev/usb/controller/ehci_pci.c. With my limited knowledge of the code I could not figure out how to properly patch the code.

Thanks.

>Release-Note:
>Audit-Trail:
>Unformatted: