[Bug 100652] [BAT][BYT] Atomic update failure on pipe A when running basic-flip-vs-dpms on CI

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100652

--- Comment #3 from Martin Peres <martin.peres at free.fr> ---
(In reply to Ville Syrjala from comment #2)
> (In reply to Martin Peres from comment #0)
> > The machine fi-byt-j1900 warned about an atomic update failure on pipe A
> > when running the test igt at kms_flip@basic-flip-vs-dpms on CI_DRM_2508.
> > 
> > Relevant line in dmesg:
> >     [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe
> > A (start=2 end=3) time 15868 us, min 763, max 767, scanline start 24, end 791
> >
> 
> ~16 ms to write a few registers! Sweet.

Maybe it is time to check out if there isn't any lock contention that could
generate this condition? Linux-rt has great tools for that!

Given that we have this bug on multiple platforms, it's possible that we could
substantially improve our chances to make the deadline. This is gonna be even
more necessary for 120Hz screens on weston (which delays the queuing of the
flip roughly mid-way through the complete scanout).

So, after all, queuing updates in a pushbuffer does not sound so stupid in this
scenario!

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