Add some helpers for fence comparision, which handle rollover properly,
and stop open coding fence seqno comparisions.
Signed-off-by: NRob Clark <robdclark@chromium.org>
Reviewed-by: NAkhil P Oommen <akhilpo@codeaurora.org>
Link: https://lore.kernel.org/r/20211109181117.591148-5-robdclark@gmail.comSigned-off-by: NRob Clark <robdclark@chromium.org>