[Bug 111922] amdgpu fails to resume on 5.2 kernel [regression]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111922

--- Comment #8 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Pierre Ossman from comment #7)
> I finally got a build environment set up, and the winner is:
> 
> > df8368be1382b442384507a5147c89978cd60702 is the first bad commit
> > commit df8368be1382b442384507a5147c89978cd60702
> > Author: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
> > Date:   Wed Feb 27 12:56:36 2019 -0500
> > 
> >     drm/amdgpu: Bump amdgpu version for per-flip plane tiling updates
> >     
> >     To help xf86-video-amdgpu and mesa know DC supports updating the
> >     tiling attributes for a framebuffer per-flip.
> >     
> >     Cc: Michel Dänzer <michel at daenzer.net>
> >     Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
> >     Acked-by: Alex Deucher <alexander.deucher at amd.com>
> >     Reviewed-by: Marek Olšák <marek.olsak at amd.com>
> >     Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> > 
> > :040000 040000 06a7975c484e74ebdaa4ccf9ee1dc5dac7a0abc9 ab68acde511d49b3f96818066bba35f255ce1656 M	drivers
> 
> Which seems extremely odd given the contents of that commit. But I guess it
> makes userspace change behaviour in a way that provokes the bug?
> 
> I don't think bisect will get me further. Help?

Userspace only enables per flip tiling updates if the version of the kernel
driver is new enough to support that feature.  Maybe this is related to the DCC
changes in mesa.

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