[Bug 108336] [CI][DRMTIP] igt@*crc tests* - warn / dmesg-warn - Suspicious CRC: it looks like the CRC read back was from a register in a powered down well

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108336

--- Comment #7 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
Current conclusion about the root cause is that some test cases like
kms_atomic_transition cause this when they apply extreme plane width and
height, drm_atomic_check_only fails then in calc_watermarks function, however
there are seem to be some not canceled side effects after that, which lead to
the issue. Then all subsequent tests fail with that "suspicious crc" issue.

I have suspicion that calc_watermarks which is called after some changes were
already applied in the end of intel_atomic_check, which leaves the system in
some weird state.

So the patch was to simply try calling it earlier. Unfortunately it helps only
partly, for some reason now at least every first time I run this test case,
everything seems to be OK, however next time we still get this "suspicious
crc". So I will continue looking to figure out the correct change.

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