drm/ast: open key before detect chips
Some config settings like 3rd TX chips will not get correctly if the extended reg is protected Signed-off-by: NY.C. Chen <yc_chen@aspeedtech.com> Reviewed-by: NEgbert Eich <eich@suse.de> Cc: stable@vger.kernel.org Signed-off-by: NDave Airlie <airlied@redhat.com>
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