[Bug 107518] polaris powerplay init fails: There must be 1 or more PCIE levels defined in PPTable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107518

            Bug ID: 107518
           Summary: polaris powerplay init fails: There must be 1 or more
                    PCIE levels defined in PPTable
           Product: DRI
           Version: unspecified
          Hardware: PowerPC
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: shawnanastasio at yahoo.com

Created attachment 141002
  --> https://bugs.freedesktop.org/attachment.cgi?id=141002&action=edit
dmesg for 4.17.11-200

When booting kernel 4.17 or 4.18-rc8+ (git) on a POWER9 system with an ASUS Rx
580 GPU, the following messages are printed to the kernel log:

[   10.398837] amdgpu: [powerplay] There must be 1 or more PCIE levels defined
in PPTable.
[   10.398839] amdgpu: [powerplay] Failed to populate SCLK during
PopulateNewDPMClocksStates Function!
[   10.398840] amdgpu: [powerplay] Failed to populate and upload SCLK MCLK DPM
levels!


Note that the system is booted with the kernel argument `amdgpu.dc=0` to work
around this issue: https://bugs.freedesktop.org/show_bug.cgi?id=107049

GPU performance seems to be significantly hindered as a result of these errors.

Booting with `amdgpu.dpm=0` silences the errors but does not improve
performance.

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