open_key enables access the registers used by enable_mmio
Signed-off-by: NY.C. Chen <yc_chen@aspeedtech.com>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: NJoel Stanley <joel@jms.id.au>
Tested-by: NY.C. Chen <yc_chen@aspeedtech.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>