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Pixel color components can be scaled using either bilinear interpolation or a multitap filter. The multitap filter provides better results, but can't be selected when the alpha layer need to be scaled down by more than 1/2. Disable alpha scaling when the input has a fixed alpha value, and program the UDS to output a fixed alpha value in that case. This ensures the multitap filter will be used whenever possible. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>