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OMAPDSS:DSSCOMP: Add mem2mem write back support.

Added mem2mem wb mode. Patch supports capturing from pipes.

Change-Id: Ia4f30e3e163023832b3b9e91d5d67ffe8ffd7365
Signed-off-by: Artem Rudenko <artemrudenko@ti.com>

Conflicts:
	drivers/video/omap2/dsscomp/base.c
	drivers/video/omap2/dsscomp/dsscomp.h
	drivers/video/omap2/dsscomp/queue.c
OMAPDSS:DSSCOMP: Ignore display resolution for WB source overlay

When WB captures from an overlay in MEM2MEM mode, the captured
image may be up-scaled beyond the size of the display.

Change-Id: If5a8faf3206923a5f218d711527cc3ff2b54a7f7
Signed-off-by: Artem Rudenko <artemrudenko@ti.com>
OMAPDSS: DSS: Wait for wb interrupt

This patch prevents skipping of frames in case we setup
a new composition until WB finishes the previous one.

Change-Id: I5793dec7f0856ce94674f326383de59f935a2f07
Signed-off-by: Artem Rudenko <artemrudenko@ti.com>

Conflicts:
	drivers/video/omap2/dss/wb.c
	include/video/omapdss.h