drm/i915: add some registers need for displayport MST support.
These are just from the Haswell spec. Reviewed-by: Todd Previte <tprevite@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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These are just from the Haswell spec. Reviewed-by: Todd Previte <tprevite@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>