[Bug 106428] reported VDDGFX GPU voltage jumps above set limits in pp_od_clk_voltage when UVD is used for VAAPI/VDPAU

[Bug 106428] reported VDDGFX GPU voltage jumps above set limits in pp_od_clk_voltage when UVD is used for VAAPI/VDPAU

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https://bugs.freedesktop.org/show_bug.cgi?id=106428

            Bug ID: 106428
           Summary: reported VDDGFX GPU voltage jumps above set limits in
                    pp_od_clk_voltage when UVD is used for VAAPI/VDPAU
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: tempel.julian@gmail.com

I adjusted my pstates in "/sys/class/drm/card0/device/pp_od_clk_voltage" that
the GPU voltage should never be above 900 mV:

(...)
5:       1126Mhz        880 mV
6:       1180Mhz        890 mV
7:       1209Mhz        900 mV

And in normal 3D applications "watch -n 0.5  cat
/sys/kernel/debug/dri/0/amdgpu_pm_info" accordingly never reports more than 900
mV for VDDGFX.

But when I play a video in mpv with VAAPI/VDPAU, reported VDDGFX often jumps to
1100 mV, which clearly is undesired behavior. It sticks again to normal 900 mV
as soon as I disable hardware decoding.

Now the question is, if the reported voltage is correct (then adjusting
pp_od_clk_voltage has a bug) or if the real voltage is just reported wrong
(than information in amdgpu_pm_info would be wrong).

Happens with both 4.17rc2 and drm-next-4.18-wip.
GPU is RX 560.

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[Bug 106428] reported VDDGFX GPU voltage jumps above set limits in pp_od_clk_voltage when UVD is used for VAAPI/VDPAU

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https://bugs.freedesktop.org/show_bug.cgi?id=106428

--- Comment #1 from tempel.julian@gmail.com ---
I did some more tests and now I'm very sure that the voltage is just reported
wrong when using UVD, and not being actually that high.
I also jumps to reported 1.1V without any pstate adjustments or overclock,
while the ASIC's default maximum voltage is actually 0.986V.
Maybe the UVD got its own voltage of 1.1V, and that is sporadically reported
instead of the core GPU voltage when UVD is used?
Anyway, not really important since it's just a little glitch and not a real
problem. :)

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[Bug 106428] reported VDDGFX GPU voltage jumps above set limits in pp_od_clk_voltage when UVD is used for VAAPI/VDPAU

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=106428

tempel.julian@gmail.com changed:

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

--- Comment #2 from tempel.julian@gmail.com ---
Closing, since it's harmless and the Windows driver shows the same behavior.

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