[Bug 108950] [CI][SHARDS] igt at kms_rotation_crc@multiplane-rotation-cropping-top - dmesg-fail - Failed assertion: !mismatch, *ERROR* CPU pipe [ABC] FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108950

--- Comment #5 from Juha-Pekka Heikkilä <juhapekka.heikkila at gmail.com> ---
(In reply to ashutosh.dixit from comment #4)
> Bug assessment: 9 months ago this test was consistently failing for both APL
> and KBL on almost every run. Since then, it has failed about 3 times on KBL,
> with the last failure on KBL 4 months ago. @Juha-Pekka Heikkilä do you think
> anything might have changed which could have fixed this issue?
> 
> (From the initial sighting, because it looked like a data mismatch, it
> looked like this might have been a HW issue, though not sure).

When I was looking for reason why this happen I get gut feeling this was timing
issue relating to planar YUV together with RGB565 on screen where it sometimes
would have been said planes are ready to be shown on screen when they were
still being created. I did look at PRMs for hints about this but I never found
any. With this reasoning it would go along this bug is more rare now as
recently primary and sprite planes handling was unified (by Ville?) from Gen9
onward.

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