Do ring clear before ring test, otherwise compute ring test will
fail after gpu resetting. Still can't find the root cause, just
workaround it.
Signed-off-by: Xiangliang.Yu <Xiangliang.Yu@amd.com>
Acked-by: Monk Liu <Monk.Liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>