[Bug 92936] Tonga powerplay isssues

[bugzilla-daemon@freedesktop.org]

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

--- Comment #11 from Andy Furniss <adf.lists@gmail.com> ---
(In reply to Alex Deucher from comment #9)
> Created attachment 121533 [details] [review]
> possible fix
> 
> Does this patch help?

Yes, it seems the patch is good.

Early days but I've so far failed to get any errors with mixed running
uvd/gl/forcing levels.

It also seems to have fixed another UVD issue where repeated running, varying
between vdpau,vaapi and omx would eventually start producing corrupted output.

UVD also still has full perf which is good :-)

With or without this patch there is still an issue around the auto perf setting
in that for real world video play back I would need to force clocks high as
auto gpu load detection doesn't up the clocks enough to do demanding tests. I
am talking about something like 2160p60 content scaled down to 1080p. Testing
with mpv whether --vo=vdpau vaapi opengl or opengl-hq will all fail to register
enough load to get the clocks up.

UVD alone (ie testing to ram) will up the clocks so auto perf is quite close to
high, but combined with really displaying it won't because I guess it gets
limited by the --vo, so doesn't get to go fast enough to up the clocks its
self.

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