tree 42f8cf6ffda40b89ae7035517aa21247067886d0
parent ee2f6cc7f9ea2542ad46070ed62ba7aa04d08871
author Andiry Xu <andiry.xu@amd.com> 1226634149 +0800
committer Greg Kroah-Hartman <gregkh@kvm.kroah.org> 1227160894 -0800

USB: fix SB700 usb subsystem hang bug

This patch is required for AMD SB700 south bridge revision A12 and A13 to avoid
USB subsystem hang symptom. The USB subsystem hang symptom is observed when the
system has multiple USB devices connected to it. In some cases a USB hub may be
required to observe this symptom.

This patch works around the problem by correcting the internal register setting
that will help by changing the behavior of the internal logic to avoid the
USB subsystem hang issue. The change in the behavior of the logic does not
impact the normal operation of the USB subsystem.

Reported-by: Volker Armin Hemmann <volker.armin.hemmann@tu-clausthal.de>
Tested-by: Volker Armin Hemmann <volker.armin.hemmann@tu-clausthal.de>
Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Libin Yang <libin.yang@amd.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>