[Bug 106363] Powerplay support for SI asics

[Bug 106363] Powerplay support for SI asics

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https://bugs.freedesktop.org/show_bug.cgi?id=106363

            Bug ID: 106363
           Summary: Powerplay support for SI asics
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: lemaitre.dulotus@yahoo.fr

This is a feature request for powerplay support on SI asics.
I can understand that they are not a priority but since they are
(experimentally) supported by AMDgpu, I think they should have it.

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[Bug 106363] Powerplay support for SI asics

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https://bugs.freedesktop.org/show_bug.cgi?id=106363

--- Comment #1 from Gregor Münch <gr.muench@gmail.com> ---
Im on Tahiti and I just append amdgpu.dpm=1 to my kernel config and things
started working.
DPMS, Suspend to Disk all is working fine.

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[Bug 106363] Powerplay support for SI asics

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https://bugs.freedesktop.org/show_bug.cgi?id=106363

--- Comment #2 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Gregor Münch from comment #1)
> DPMS, Suspend to Disk all is working fine.

Neither DPMS nor suspend to disk has anything to do with PowerPlay (or DPM)
though. :)

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[Bug 106363] Powerplay support for SI asics

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https://bugs.freedesktop.org/show_bug.cgi?id=106363

--- Comment #3 from Alex Deucher <alexdeucher@gmail.com> ---
dpm is enabled by default on SI parts so setting dpm=1 doesn't change anything.

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[Bug 106363] Powerplay support for SI asics

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https://bugs.freedesktop.org/show_bug.cgi?id=106363

--- Comment #4 from Gregor Münch <gr.muench@gmail.com> ---
(In reply to Alex Deucher from comment #3)
> dpm is enabled by default on SI parts so setting dpm=1 doesn't change
> anything.

This depends if you use amdgpu instead of radeon on SI. In that case amdgpu.dpm
seems to be disabled.
I tried to enable DPMS and read through a bunch of tutorials configuring Xorg
but nothing did work.
Then I stumbled about a newsentry on phoronix mentioned this patch:
https://lists.freedesktop.org/archives/amd-gfx/2018-May/022771.html
There you change the behavior for CIK parts to use PP by default. The logic of
this patch changes amdgpu.dpm=-1 (auto) to switch from whatever to Powerplay.


I started my Kernel with amdgpu.dpm=1 and everything suddenly worked like
magic.

Since I dont what Powerplay actually does in the Linux world and a quick google
search came up with nothing and modinfo amdgpu just reveils
dpm:DPM support (1 = enable, 0 = disable, -1 = auto) (int)
but nothing about Powerplay I was really under the impression that DPM also
enables Powerplay.
Im sorry for the confusion.

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[Bug 106363] Powerplay support for SI asics

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https://bugs.freedesktop.org/show_bug.cgi?id=106363

--- Comment #5 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Gregor Münch from comment #4)
> (In reply to Alex Deucher from comment #3)
> > dpm is enabled by default on SI parts so setting dpm=1 doesn't change
> > anything.
> 
> This depends if you use amdgpu instead of radeon on SI. In that case
> amdgpu.dpm seems to be disabled.

nope.  dpm is enabled by default on both radeon and amdgpu.

> I tried to enable DPMS and read through a bunch of tutorials configuring
> Xorg but nothing did work.

DPMS is not related to dpm at all.

> Then I stumbled about a newsentry on phoronix mentioned this patch:
> https://lists.freedesktop.org/archives/amd-gfx/2018-May/022771.html
> There you change the behavior for CIK parts to use PP by default. The logic
> of this patch changes amdgpu.dpm=-1 (auto) to switch from whatever to
> Powerplay.

This change applies to CIK only not SI.

> 
> 
> I started my Kernel with amdgpu.dpm=1 and everything suddenly worked like
> magic.
> 
> Since I dont what Powerplay actually does in the Linux world and a quick
> google search came up with nothing and modinfo amdgpu just reveils
> dpm:DPM support (1 = enable, 0 = disable, -1 = auto) (int)
> but nothing about Powerplay I was really under the impression that DPM also
> enables Powerplay.
> Im sorry for the confusion.

dpm and powerplay are just two sw implementations of the same hardware
functionality.  CIK and VI share the same SMU IP so they can share most of the
power code.  SI uses an old SMU block and can't share the code so it still uses
the dpm implementation originally ported from radeon.

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[Bug 106363] Powerplay support for SI asics

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https://bugs.freedesktop.org/show_bug.cgi?id=106363

--- Comment #6 from Gregor Münch <gr.muench@gmail.com> ---
Thanks for your explanations Alex.

Maybe useful for other:
It turned out that Steam client has probably a bug preventing screensaver
getting active.

https://github.com/ValveSoftware/steam-for-linux/issues/5532

One more problem seems to be that Deepin or whatever still cant run the
screensaver even after Steam was closed.

https://github.com/linuxdeepin/developer-center/issues/567

Im sorry again for occupying this bug report.

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[Bug 106363] Powerplay support for SI asics

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https://bugs.freedesktop.org/show_bug.cgi?id=106363

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #7 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/371.

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