[Bug 97362] Low performance after suspend on RX 480

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=97362

            Bug ID: 97362
           Summary: Low performance after suspend on RX 480
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: haagch@frickel.club

Created attachment 125811
  --> https://bugs.freedesktop.org/attachment.cgi?id=125811&action=edit
dmesg

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Ellesmere [Polaris10] (rev c7)

Tried on vanilla Linux 4.7 and 4.8-rc2 with the async pageflip commit reverted.

I'm testing with a very simple directx9 application (without nine) because the
impact is extremely obvious with wine:
http://www.codesampler.com/dx9src/dx9src_1.htm#dx9_initialization

Before suspending it runs with 5000+ FPS, after suspending it runs with <1000.
Also, if you keep the mouse pointer over the window moving, it will have a very
small performance drop before suspending and a huuuge performance drop after
suspending.

I looked at the powerplay values in sysfs while that application is running in
wine and before suspend,
pcie is
0: 2.5GB, x8 
1: 8.0GB, x16 *
and sclk is
0: 300Mhz 
1: 608Mhz 
2: 910Mhz 
3: 1077Mhz 
4: 1145Mhz 
5: 1191Mhz 
6: 1236Mhz 
7: 1288Mhz *

after suspend it's
pcie
0: 2.5GB, x8 *
1: 8.0GB, x16 
and sclk
0: 300Mhz 
1: 608Mhz *
2: 910Mhz 
3: 1077Mhz 
4: 1145Mhz 
5: 1191Mhz 
6: 1236Mhz 
7: 1288Mhz 


mclk is
0: 300Mhz 
1: 2000Mhz *
in both cases.

I then tried
echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level
and the sclk clock goes to max and pcie goes to 16x again, but the performance
of the application does NOT increase so it looks like the low clocks are a
symptom of whatever causes low performance.

dmesg from 4.8-rc2 attached, shows some errors:

[  574.369317] 
                failed to send message 5e ret is 0 


[  574.369317] [drm:amdgpu_vce_ring_test_ring [amdgpu]] *ERROR* amdgpu: ring 12
test failed
[  574.369317] [drm:amdgpu_resume [amdgpu]] *ERROR* resume of IP block
<vce_v3_0> failed -110
[  574.369317] [drm:amdgpu_resume_kms [amdgpu]] *ERROR* amdgpu_resume failed
(-110).

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