[Bug 112377] [TGL] media VME encoding GPU hang w/o i915 error state captured

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112377

Dmitry Rogozhkin <dmitry.v.rogozhkin at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mika.kuoppala at intel.com

--- Comment #12 from Dmitry Rogozhkin <dmitry.v.rogozhkin at intel.com> ---
This occurs to be a regression in drm-tip or a change which should be reflected
on user space as well. Git bisect points to the following commit. Reverting it
makes the use case pass. @Mika: can you, please, comment why the change could
break media usage?

commit 08fff7aeddc9dd72161b4c8fc27fbab12b4b9352
Author: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Date:   Tue Oct 15 18:44:49 2019 +0300

    drm/i915/tgl: Wa_1607138340

    Avoid possible cs hang with semaphores by disabling
    lite restore.

    Signed-off-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20191015154449.10338-11-mika.kuoppala@linux.intel.com



I am attaching:
1. Git bisect log
2. i915 error state dumped from kernel @904ce198 (this kernel does not have
preemption timeout)

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