USB: ehci-dbgp: errata for EHCI debug controller initialization
authorJason Wessel <jason.wessel@windriver.com>
Thu, 20 Aug 2009 20:39:55 +0000 (15:39 -0500)
committerGreg Kroah-Hartman <gregkh@suse.de>
Wed, 23 Sep 2009 13:46:38 +0000 (06:46 -0700)
commitaab2d4086a1876fcff282aa36e2d4a92aa9935c9
tree3b1bb3d934bec91c44eaf61aadb6c624eb8dd9b3
parent8d053c79f22462f55c02c8083580730b922cf7b4
USB: ehci-dbgp: errata for EHCI debug controller initialization

On some EHCI usb debug controllers, the EHCI debug device will fail to
be seen after a port reset, after a warm reset.  Two options exist to
get the device to initialize correctly.

Option 1 is to unplug and plug in the device.

Option 2 is to use the EHCI port test to get the usb debug device to
start talking again.  At that point the debug controller port reset
will succeed.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
CC: dbrownell@users.sourceforge.net
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/usb/early/ehci-dbgp.c
include/linux/usb/ehci_def.h