driver needs to take DF out Cstate before any DF register
access. otherwise, the DF register may not be accessible.
Signed-off-by: NHawking Zhang <Hawking.Zhang@amd.com>
Acked-by: NEvan Quan <evan.quan@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>