drm/i915: split power well 'set' handler to separate enable/disable/sync_hw
Split the 'set' power well handler into an 'enable', 'disable' and 'sync_hw' handler. This maps more conveniently to higher level operations, for example it allows us to push the hsw package c8 handling into the corresponding hsw/bdw enable/disable handlers and the hsw BIOS hand-over setting into the hsw/bdw sync_hw handler. No functional change. Signed-off-by: NImre Deak <imre.deak@intel.com> Reviewed-by: NJesse Barnes <jbarnes@virtuousgeek.org> [danvet: Appease checkpatch's whitespace complaints.] Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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