drm/i915/dp: Add register definitions for Intel HDR backlight interface
No functional changes yet, this just adds definitions for all of the known DPCD registers used by Intel's HDR backlight interface. Since we'll only ever use this in i915, we just define them in intel_dp_aux_backlight.c Reviewed-by:Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by:
Lyude Paul <lyude@redhat.com> Cc: thaytan@noraisin.net Cc: Vasily Khoruzhick <anarsoul@gmail.com> Signed-off-by:
Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201204223603.249878-7-lyude@redhat.com
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