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1. Add scaler to writeback pipeline to enable the writeback scaling support 2. Display HW can not do upscaling for writeback, check it when validate. v2: Rebase Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com> Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
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