ba45df4cb7
[Why] DM may want to understand any backlight optimizations applied, so DM needs a way to query from the HW both the real current backlight, which may be value during transition. And also target backlight, which may be after some backlight optimizations applied. [How] Add interface to query current and target backlight levels Target level may indicate backlight level after backlight optimization and reductions are applied. Signed-off-by: Anthony Koo <Anthony.Koo@amd.com> Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com> Acked-by: Leo Li <sunpeng.li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>