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[amdgpu] ring gfx timeout after waking from suspend and exiting X

Reposting Bugzilla Bug 216359:

After waking up from suspend and exiting X (and trying to switch to a different tty that is running X, but I think the bug happens before that), I get:

Aug 14 08:27:21 up kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but soft recovered
Aug 14 08:27:31 up kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but soft recovered
Aug 14 08:27:42 up kernel: [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but soft recovered

The screen freezes, and I have to reboot to get a stable system.

Arch Linux 5.18.12.arch1-1 is good.

Arch Linux 5.18.14.arch1-1 is bad.

Arch Linux 5.18.15.arch1-1 is bad.

Arch Linux 5.18.16.arch1-1 is bad.

Arch Linux 5.19.1.arch2-1 is bad.

4ffcacab7145080187330accafae69e87a481eec is the first bad commit.

commit 4ffcacab7145080187330accafae69e87a481eec
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Tue Jun 21 10:10:37 2022 -0400

    drm/amdgpu/display: disable prefer_shadow for generic fb helpers
    
    [ Upstream commit 3a4b1cc28fbdc2325b3e3ed7d8024995a75f9216 ]
    
    Seems to break hibernation.  Disable for now until we can root
    cause it.
    
    Fixes: 087451f372bf ("drm/amdgpu: use generic fb helpers instead of setting up AMD own's.")
    Bug: https://bugzilla.kernel.org/show_bug.cgi?id=216119
    Acked-by: Evan Quan <evan.quan@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>

 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c          | 3 ++-
 drivers/gpu/drm/amd/amdgpu/dce_v10_0.c            | 3 ++-
 drivers/gpu/drm/amd/amdgpu/dce_v11_0.c            | 3 ++-
 drivers/gpu/drm/amd/amdgpu/dce_v6_0.c             | 3 ++-
 drivers/gpu/drm/amd/amdgpu/dce_v8_0.c             | 3 ++-
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 ++-
 6 files changed, 12 insertions(+), 6 deletions(-)

GPU:

$ lspci -nn | grep VGA
0c:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Vega 10 XL/XT [Radeon RX Vega 56/64] [1002:687f] (rev c3)