[Bug 88012] [bisected BYT] complete freeze after: drm/i915/vlv: WA for Turbo and RC6 to work together

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88012

--- Comment #65 from Maxime Bergeron <mazout360 at gmail.com> ---
(In reply to Andy Furniss from comment #64)
> Trying to test with make going back in the history didn't get very far as I
> soon found that history is inconsistent due to the merges so I would test a
> commit (git reset --hard) fail, look at the history and choose an earlier
> commit then find that when reset on that the history was totally different
> and I was testing without the commits that "fixed" the issue in the first
> place 
> 
> c4d390d drm/i915: Use down ei for manual Baytrail RPS calculations
> 168ebd7 drm/i915: Improved w/a for rps on Baytrail
> 
> even though the previous history/log had them way down after the new place I
> wanted to try.

Yes indeed it gets complicated with merges. 
Personally if I compile virgin/testing/drm-intel as of today, I get a GPU hang
on kodi boot (attached dmesg-4.0.0 and crashlog-4.0.0) with a segmentation
fault.
Else, if I revert before the patchset including:

8fb55197e64d5988ec57b54e973daeea72c3f2ff
drm/i915: Agressive downclocking on Baytrail 

It does work, although with the patchset too but it ends up hanging with
>=1080p videos. That's weird as this commit doesn't seem to be linked to the
original problem, so it's like if this was simply exacerbating another
underlying, older issue that might've been missed. For now I'm running 4.1 from
Linus github and it works fine...for now.

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