[Bug 205393] New: [amdgpu powerplay] vega10: custom pp_table, AVFS accidentally reenabled after display powersave - bugzilla-daemon

From: bugzilla-daemon@bugzilla.kernel.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 205393] New: [amdgpu powerplay] vega10: custom pp_table, AVFS accidentally reenabled after display powersave
Date: Sat, 02 Nov 2019 21:26:42 +0000	[thread overview]
Message-ID: <bug-205393-2300@https.bugzilla.kernel.org/> (raw)

https://bugzilla.kernel.org/show_bug.cgi?id=205393

            Bug ID: 205393
           Summary: [amdgpu powerplay] vega10: custom pp_table, AVFS
                    accidentally reenabled after display powersave
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.4-rc5
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: haro41@gmx.de
        Regression: No

Created attachment 285755
  --> https://bugzilla.kernel.org/attachment.cgi?id=285755&action=edit
patch to prevent AVFS reenabling (against 5.4-rc5)

When uploading a customized powerplay table, AVFS feature becomes correctly
disabled.

But after a power save (blanc screen) event, AVFS becomes accidentally enabled
again. This results in unwanted gfx voltage changes.

Example:

vddc = 1.075V after pp table upload (correct).

vddc = 1.150V after power save event (set by smc because AVFS feature
reenabled).

I have debugged this issue and found a simple solution. There is a patch
attached, that solves the problem.

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