commit be0949f5 upstream.

There is actually quite a bit of variance based on
the asic.

v2: fix typo noticed by Jerome.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>