Write Back pipeline usage guide

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Write Back pipeline is a key feature addition in OMAP4. Writeback pipeline is yet another pipeline but unique in its way because unlike other pipelines it can take the input from both the overlay /pipeline(memory to memory mode ) and the overlay manager (The composited data normally fed to associated display) thus allows to take benefit of the HW processing available inside the display controller like color space conversion, re-scaling, compositing, etc., to perform memory to memory transfer with data processing.

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