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<b><a class="bz_bug_link
bz_status_CLOSED bz_closed"
title="CLOSED FIXED - [BAT execlists] Sporadic - gem_exec_suspend basic-s4 GPU hang after resume"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96526#c71">Comment # 71</a>
on <a class="bz_bug_link
bz_status_CLOSED bz_closed"
title="CLOSED FIXED - [BAT execlists] Sporadic - gem_exec_suspend basic-s4 GPU hang after resume"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96526">bug 96526</a>
from <span class="vcard"><a class="email" href="mailto:solitone@mail.com" title="solitone <solitone@mail.com>"> <span class="fn">solitone</span></a>
</span></b>
<pre>Jani Nikula explained the history of this patch [1]:
<span class="quote">> (In reply to Damian Martinez Dreyer from <a href="show_bug.cgi?id=96526#c0">comment #0</a>)
> > Description: I have bisected Kernel 4.9.9 and determined the following to be
> > the cause:
> >
> > commit f2a0409a08502d64fbe3990354dff5902b08d2fb
> > Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
> > 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 <<a href="mailto:gregkh@linuxfoundation.org">gregkh@linuxfoundation.org</a>>
> 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 <<a href="mailto:jani.nikula@linux.intel.com">jani.nikula@linux.intel.com</a>>
> Cc: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
> Cc: Joonas Lahtinen <<a href="mailto:joonas.lahtinen@linux.intel.com">joonas.lahtinen@linux.intel.com</a>>
> Cc: Eric Blau <<a href="mailto:eblau1@gmail.com">eblau1@gmail.com</a>>
> Signed-off-by: Greg Kroah-Hartman <a href="mailto:gregkh@linuxfoundation.org">gregkh@linuxfoundation.org</a>
>
> Thread <a href="http://mid.mail-archive.com/1489443835.5568.7.camel@mailbox.org">http://mid.mail-archive.com/1489443835.5568.7.camel@mailbox.org</a> has
> the details.</span >
[1] <a class="bz_bug_link
bz_status_CLOSED bz_closed"
title="CLOSED FIXED - [SKL] Resume from suspend to disk fails - bisected"
href="show_bug.cgi?id=100221#c10">https://bugs.freedesktop.org/show_bug.cgi?id=100221#c10</a></pre>
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