drm/i915: handle backlight through chip specific functions
The backlight code has grown rather hairy, not least because the hardware registers and bits have repeatedly been shuffled around. And this isn't expected to get any easier with new hardware. Make things easier for our (read: my) poor brains, and split the code up into chip specific functions. There should be no functional changes. Signed-off-by: NJani Nikula <jani.nikula@intel.com> Reviewed-by: NImre Deak <imre.deak@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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