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Some platforms need additional power domains to be on in addition to the
device D0 state to access the panel registers.

Suggested by Daniel.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76987

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>