drm/omap: use flip-work helper
And simplify how we hold a ref+pin to what is being scanned out by using fb refcnt'ing. The previous logic pre-dated fb refcnt, and as a result was less straightforward than it could have been. By holding a ref to the fb, we don't have to care about how many plane's there are and holding a ref to each color plane's bo. Signed-off-by: NRob Clark <robdclark@gmail.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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