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drm/ast: Call open_key before enable_mmio in POST code
commit 9bb92f5 upstream. open_key enables access the registers used by enable_mmio Signed-off-by: Y.C. Chen <yc_chen@aspeedtech.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Joel Stanley <joel@jms.id.au> Tested-by: Y.C. Chen <yc_chen@aspeedtech.com> Signed-off-by: Dave Airlie <airlied@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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