[Bug 96526] [BAT execlists] Sporadic - gem_exec_suspend basic-s4 GPU hang after resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96526

--- Comment #71 from solitone <solitone at mail.com> ---
Jani Nikula explained the history of this patch [1]:

> (In reply to Damian Martinez Dreyer from comment #0)
> > Description: I have bisected Kernel 4.9.9 and determined the following to be
> > the cause:
> > 
> > commit f2a0409a08502d64fbe3990354dff5902b08d2fb
> > Author: Chris Wilson <chris at chris-wilson.co.uk>
> > Date:   Wed Sep 21 14:51:08 2016 +0100
> > 
> >     drm/i915/execlists: Reset RING registers upon resume
> >     
> >     commit bafb2f7d4755bf1571bd5e9a03b97f3fc4fe69ae upstream.
> 
> The stable backport has been reverted in v4.9.23 by
> 
> commit 0ee72d8f9b8e17b8e4ccfebc7a25cbc2d395cd6a
> Author: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
> Date:   Wed Apr 12 15:49:39 2017 +0200
> 
>     Revert "drm/i915/execlists: Reset RING registers upon resume"
>     
>     This reverts commit f2a0409a08502d64fbe3990354dff5902b08d2fb which is
>     commit bafb2f7d4755bf1571bd5e9a03b97f3fc4fe69ae upstream.
>     
>     It was reported to have problems.
>     
>     Cc: Jani Nikula <jani.nikula at linux.intel.com>
>     Cc: Chris Wilson <chris at chris-wilson.co.uk>
>     Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
>     Cc: Eric Blau <eblau1 at gmail.com>
>     Signed-off-by: Greg Kroah-Hartman gregkh at linuxfoundation.org
> 
> Thread http://mid.mail-archive.com/1489443835.5568.7.camel@mailbox.org has
> the details.

[1] https://bugs.freedesktop.org/show_bug.cgi?id=100221#c10

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