On Fri, 4 Mar 2022 15:46:07 +0100 Maxime Ripard <maxime@xxxxxxxxxx> wrote: > Indeed, while the input buffer uses 0xff for the X component, we'll get > back 0x00 from the hardware, and thus the hashes are not identical. We > can force the hardware to always set it to 0xff, but that doesn't seem > right. It would make more sense to ignore the X component entirely in > that case. Hi, I tried hard to send a slightly longer response, but gmail refuses to deliver to anyone without explanation. So here's a summary of my opinion: - KMS must ignore X channel contents on read - IGT must ignore X channel contents when comparing results - it would be nice if IGT filled image X channels with garbage to verify the first two points Thanks, pq
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