drm/i915: Add option to support dynamic backlight via DPCD
This patch adds option to enable dynamic backlight for eDP panel that supports this feature via DPCD register and set minimum / maximum brightness to 0% and 100% of the normal brightness. Signed-off-by: NPuthikorn Voravootivat <puthik@chromium.org> Reviewed-by: NDhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20170622190339.142671-4-puthik@chromium.org
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