[Intel-gfx] drm-intel-fixes CI issues

[Rodrigo Vivi]

Hi all,

I need your help to decide what to do with this round of fixes.

I have collected these patches this week:

commit b43e8916172a ("drm/i915/dp: Link train Fallback on eDP only if fallback link BW can fit panel's native mode")
commit 5abb01e541ed ("drm/i915: Fix intel_dp_mst_best_encoder()")
commit 02713246296d ("drm/i915: Skip vcpi allocation for MSTB ports that are gone")
commit cc6e027f5f50 ("drm/i915: Don't unset intel_connector->mst_port")
commit f5aec50ba21e ("drm/i915: Use the correct crtc when sanitizing plane mapping")
commit 6547684bf50a ("drm/i915: Restore vblank interrupts earlier")

CI_DIF_309 represents Greg's v4.19-rc7 and it is clean.

However 2 following CI runs are kind of strange.

There's few underruns here and there, but those looks flip-flops.

My biggest concern is specially around:

igt at kms_plane@pixel-format-pipe-a-planes:
https://intel-gfx-ci.01.org/tree/drm-intel-fixes/shards.html

https://intel-gfx-ci.01.org/tree/drm-intel-fixes/CI_DIF_311/shard-glk8/igt@kms_plane@pixel-format-pipe-c-planes.html

Thoughts?

I'm holding the pull request for now and will try to do some local tests here
to see if I can identify a culprit.

Thanks,
Rodrigo.