[Bug 86697] [BSW] GPU hang at the second cycle to execute S4 command

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86697

--- Comment #21 from wendy.wang at intel.com ---
(In reply to Ville Syrjala from comment #12)
> Created attachment 110163 [details] [review]
> [PATCH] drm/i915: Don't frob Gunit registers on CHV
> 
> Random idea of the day. Please try this and report back.

Hello Ville,

About this patch, it's hard to describe the S4 symptom I've observed, so list
here with 2 kinds of status：

Status 1：
After boot up the kernel with this patch, at the 2nd trying to do S4, I saw
system hang up: with Keyboard no response.

Status 2: encountered other call trace when doing 2nd or 3rd time S4 command,
seems not related to i915. in this scenario, I did not see GPU hang problem.
Captured some dmesg log, if you are interesting in them.

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