[Bug 110394] Skylake GPU HANG while gstreamer H264 vaapi encoding from MJPEG vaapi decode on drm-tip

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110394

--- Comment #28 from Andy Nicholas <andy.nicholas at shield.ai> ---
(In reply to Chris Wilson from comment #26)
> The other step would be to disable rc6 only and keep the powergate in
> gen9_enable_rc6() -- to confirm which of the two is the risk.

To be clear - I believe this is the state of Shield's testing, all of which use
the same drm-tip kernel from 3 weeks ago, all of which are transcoding from
MJPEG --> H264:

(1) Only disable RC6, no other changes == no GPU issues

(2) Only disable coarse power-gating [in gen9_enable_rc6()], no other changes
== GPU hangs.

(3) No changes to drm-tip kernel == GPU hangs.


I'm guessing that there's something that RC6 allows which can cause the
transcoder GPU hangs to occur, but whatever that is, it's not related to coarse
power gating.

I will proceed with placing both changes (RC6 disable + Coarse power gating
disable) into a kernel. I'm expecting the GPU not to hang/crash.

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