overlay: Remove optimization that prevents garbage collection
There is an optimization to not do garbage collection (and thus UNSET)
if pipe usage hasn't change, added during older chip time frames.
It worked then because, continuous overlay failures were not normal,
and on failure userspace didn't UNSET remaining pipes.
On newer chips, owing to bandwidth limitations, continuous overlay
failures could happen, plus now we UNSET all other pipes. Thus each
round if GPU gets used, the optimization infers that pipe usage hasn't
changed and does not UNSET pipes.
Also the optimization doesn't do anything useful than saving a few
loops, but is suicidal in current situations, so can safely be done
away with.
Change-Id: I33bd64a599d8ade337707301188c94cf8e6aac81
1 file changed