On Fr, 2024-05-17 at 12:45 +0200, Lucas Stach wrote: > The timeout when waiting for the PRE safe window is rather short, as > normally we would only need to wait a few dozen usecs for the problematic > scanline region to pass and we don't want to spin too long in case > something goes wrong. This however mixes badly with preemption, as we > can easily get scheduled away from the CPU for a longer time than our > timeout, in which case we would hit a spurious timeout and wrongly skip > the PRE update. > > Instead of disabling preemption across the wait loop, potentially > impacting the overall system latency, use a wait loop with a fixed > max number of iterations, so time spent away from the CPU is not > accounted against the timeout budget. > > Signed-off-by: Lucas Stach <l.st...@pengutronix.de>
Reviewed-by: Philipp Zabel <p.za...@pengutronix.de> regards Philipp
