[Bug 207137] New: AMDGPU incorrectly reports vddgfx voltage for R9 390

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=207137

            Bug ID: 207137
           Summary: AMDGPU incorrectly reports vddgfx voltage for R9 390
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.6
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: low
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: sandy.8925 at gmail.com
        Regression: No

I'm using an R9 390 GPU.

vddgfx voltage is always reported as 1 Volt, regardless of load.

I debugged and found that in smu7_hwmgr.c , in funcion smu7_read_sensor(), the
voltage is read from PLANE2_VID when a certain condition is true. This always
results in a final value of 1 Volt.

When I changed the code to read only from PLANE1_VID, the correct voltage seems
to be reported, and it changes under load, from ~900 mv to 1.3 V.

Please fix.

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