[Bug 110777] Kernel 5.1-5.2 MCLK stuck at 167MHz Vega 10 (56)

[Bug 110777] Kernel 5.1-5.2 MCLK stuck at 167MHz Vega 10 (56)

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https://bugs.freedesktop.org/show_bug.cgi?id=110777

            Bug ID: 110777
           Summary: Kernel 5.1-5.2 MCLK stuck at 167MHz Vega 10 (56)
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: antonh@gmx.de

Hi,

Since Kernel 5.1 up-to Kernel 5.2 my Vega 56 card's memory clock is stuck at
167MHz and does not boost up any more.
The exact same setup boosts fine to 1000MHz memclk when running Kernel 5.0.13.

Is there any info I can provide to get this fixed?

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[Bug 110777] Kernel 5.1-5.2 MCLK stuck at 167MHz Vega 10 (56)

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https://bugs.freedesktop.org/show_bug.cgi?id=110777

--- Comment #1 from antonh@gmx.de ---
This is still occuring on latest linux master
cd6c84d8f0cdc911df435bb075ba22ce3c605b07

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[Bug 110777] Kernel 5.1-5.2 MCLK stuck at 167MHz Vega 10 (56)

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https://bugs.freedesktop.org/show_bug.cgi?id=110777

--- Comment #2 from antonh@gmx.de ---
The issue is fully fixed on kernel master (currently I am using commit
460b48a0fefce25beb0fc0139e721c5691d65d7f) when reverting
drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c back to the state it was
around kernel 5.0.13.

https://git.archlinux.org/linux.git/tree/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c?h=v5.0.13-arch1

I will start bisecting soon to figure out the exact commit that has caused the
issue.

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[Bug 110777] Kernel 5.1-5.2 MCLK stuck at 167MHz Vega 10 (56)

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https://bugs.freedesktop.org/show_bug.cgi?id=110777

--- Comment #3 from antonh@gmx.de ---
reverting the following two patches fixes the boost in memory clocks but it
seems once mem clock has ramped up it's not going down again.

1.
Revert "drm/amd/powerplay: update soc boot and max level on vega10"   
This reverts commit 373e87fc91527124cb8ec21465a6d070a65c56af.

2.
Revert "drm/amd/powerplay: support Vega10 SOCclk and DCEFclk dpm level
settings"
This reverts commit bb05821b13fa0c0b97760cb292b30d3105d65954.

Evan Quan <evan.quan@amd.com>
Alex Deucher <alexander.deucher@amd.com>

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[Bug 110777] Kernel 5.1-5.2 MCLK stuck at 167MHz Vega 10 (56)

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https://bugs.freedesktop.org/show_bug.cgi?id=110777

--- Comment #4 from Anton Herzfeld <antonh@gmx.de> ---
Is there anything else I can provide to support getting this fixed?

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[Bug 110777] Kernel 5.1-5.2 MCLK stuck at 167MHz Vega 10 (56)

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https://bugs.freedesktop.org/show_bug.cgi?id=110777

--- Comment #5 from Anton Herzfeld <antonh@gmx.de> ---
The following patch fixes the issue with boosting again:

https://cgit.freedesktop.org/~agd5f/linux/commit/drivers/gpu/drm/amd/powerplay/hwmgr?h=amd-staging-drm-next&id=7d59c41b5150d0641203f91cfcaa0f9af5999cce

however it also seems to expose the issue in mclk not going down again once it
has boosted.

just to clarify the issue occurs when using manual OD on mclk since kernel 5.1.

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[Bug 110777] Kernel 5.1-5.2 MCLK stuck at 167MHz Vega 10 (56)

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https://bugs.freedesktop.org/show_bug.cgi?id=110777

Anton Herzfeld <antonh@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|dri-devel@lists.freedesktop |alexdeucher@gmail.com
                   |.org                        |

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