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

[bugzilla-daemon@freedesktop.org]

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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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