[Bug 92936] Tonga powerplay isssues

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92936

--- Comment #6 from Andy Furniss <adf.lists at gmail.com> ---
Ignoring lockups for now as maybe powerplay/4.5 need something like -

fixes-4.4 commit drm/amdgpu: fix user fence handling

plus I see vaapi threading fixes waiting in mesa.

Testing latest powerplay and the UVD breaks things issue is still present and
there is nothing new in dmesg.

Looking at cat /sys/kernel/debug/dri/64/amdgpu_pm_info what happens is -

Testing opengl initially working though gpu load sometimes looks a bit high
when nothing is happening (clocks still low).

test just UVD (no vo) on auto,  mclk and sclk rise (sclk not 100% though)

After this it seems mclk gets stuck low so running opengl looks like -

 [  mclk  ]: 150 MHz

 [  sclk  ]: 972 MHz

 [GPU load]: 100%

Nothing is logged at this point.

If I now try to force high it fails and I see 

[ 7445.269812] Failed to send Message.
[ 7445.269815] force highest mclk dpm state failed!

Clocks now look like 

 [  mclk  ]: 0 MHz

 [  sclk  ]: 0 MHz

 [GPU load]: 0%

using opengl perf is still low and clocks still say 0 load 100%.

If I use uvd the clocks do go high

 [  mclk  ]: 1375 MHz

 [  sclk  ]: 973 MHz

 [GPU load]: 23%

and they stay high and opengl perf is good again.

cat /sys/class/drm/card0/device/power_dpm_force_performance_level

still says auto.

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