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Like most other plane control register bits, the pipe gamma enable bit is also blocked by CxSR. So make sure we kick the machine out of CxSR before trying to change that bit. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220622155452.32587-8-ville.syrjala@linux.intel.com Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>