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

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

[bugzilla-daemon]

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@kernel-bugs.osdl.org
          Reporter: sandy.8925@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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[Bug 207137] AMDGPU incorrectly reports vddgfx voltage for R9 390

[bugzilla-daemon]

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

Alex Deucher (alexdeucher@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #1 from Alex Deucher (alexdeucher@gmail.com) ---
Can you attach a copy of your vbios and dmesg output?  You can dump a copy of
your vbios using the following:
sudo cat /sys/kernel/debug/dri/0/amdgpu_vbios > /tmp/vbios.rom

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

[bugzilla-daemon]

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

sandy.8925@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sandy.8925@gmail.com

--- Comment #2 from sandy.8925@gmail.com ---
Created attachment 288233
  --> https://bugzilla.kernel.org/attachment.cgi?id=288233&action=edit
dmesg output

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

[bugzilla-daemon]

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

--- Comment #3 from sandy.8925@gmail.com ---
Created attachment 288235
  --> https://bugzilla.kernel.org/attachment.cgi?id=288235&action=edit
GPU VBIOS

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

[bugzilla-daemon]

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

sandy.8925@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|5.6                         |5.8

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

[bugzilla-daemon]

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

sandy.8925@gmail.com changed:

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

--- Comment #4 from sandy.8925@gmail.com ---
Fixed with
https://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-next&id=3425740adf97b2258966ee3f0d871fd5cc314028

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