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Rockchip RGA is a separate 2D raster graphic acceleration unit. It accelerates 2D graphics operations, such as point/line drawing, image scaling, rotation, BitBLT, alpha blending and image blur/sharpness. Change-Id: I9be8d683ea04802affb973b8b1ada646afe411d7 Signed-off-by: Yakir Yang <ykk@rock-chips.com>