drm/i915: Set backlight mode before enable backlight
We should set backlight mode register before set register to enable the backlight. Signed-off-by: NPuthikorn Voravootivat <puthik@chromium.org> Reviewed-by: NDhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Signed-off-by: NJani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170511230225.142870-6-puthik@chromium.org
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