Enable at init and disable on fini. Workaround for hardware problems.

v2 (chk): extend commit message
v3: add new function
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com> (v2)
Cc: stable@vger.kernel.org