staging: drm/omap: defer unpin until scanout completes
When flipping, defer unpinning until scanout completes, as indicated by the appropriate END_WIN irq. This also re-organizes things a bit, in replacing omap_fb_{pin,unpin} with omap_fb_replace(), to make it easier to add support for scanout synchronized DMM refill mode (flipping by just reprogramming DMM synchronized with DSS scanout). Signed-off-by: NRob Clark <rob@ti.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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