[Bug 198713] New: AMD DC crashes when computing clocks/detecting freesync

[Bug 198713] New: AMD DC crashes when computing clocks/detecting freesync

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198713

            Bug ID: 198713
           Summary: AMD DC crashes when computing clocks/detecting
                    freesync
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.15.1-7
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: jon@moozaad.co.uk
        Regression: No

Created attachment 274053
  --> https://bugzilla.kernel.org/attachment.cgi?id=274053&action=edit
dmesg output

Fury X  w/ BenQ XL2730Z connected with DisplayPort

amdgpu.dc=1 is NOT set.

See attached dmesg for 12 traces related to DC.

It looks to be crashing whilst detecting/computing clocks when freesync is
detected. I've not set it to be enabled.

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[Bug 198713] AMD DC crashes when computing clocks/detecting freesync

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198713

--- Comment #1 from Jon (jon@moozaad.co.uk) ---
Created attachment 274055
  --> https://bugzilla.kernel.org/attachment.cgi?id=274055&action=edit
kernel config from /boot

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[Bug 198713] AMD DC crashes when computing clocks/detecting freesync

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198713

Mike Lothian (mike@fireburn.co.uk) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mike@fireburn.co.uk

--- Comment #2 from Mike Lothian (mike@fireburn.co.uk) ---
You don't need amdgpu.dc=1 set, it's already enabled in the .config that you
provided:

CONFIG_DRM_AMD_DC = y
CONFIG_DRM_AMD_DC_PRE_VEGA = y

As a workaround try amdgpu.dc=0

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[Bug 198713] AMD DC crashes when computing clocks/detecting freesync

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198713

--- Comment #3 from Jon (jon@moozaad.co.uk) ---
(In reply to Mike Lothian from comment #2)
> As a workaround try amdgpu.dc=0

Well spotted. Workaround has stopped the traces as you'd expect. It's also
stopped the weird blue flicker I was getting in KDE with OGL3 compositor
(different DC bug).

I hope the above is useful for getting PRE_VEGA out of experimental!


Missing from original report, it's 3x BenQ XL2730Z, all display port.

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[Bug 198713] AMD DC crashes when computing clocks/detecting freesync

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198713

Nicholas Johnson (nicholas.johnson@outlook.com.au) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nicholas.johnson@outlook.co
                   |                            |m.au

--- Comment #4 from Nicholas Johnson (nicholas.johnson@outlook.com.au) ---
I did not find this when posting my bug. This might be the same thing. Except
mine is two whole kernel versions newer, and it is still doing it. AMD do not
seem to be taking Linux seriously....

https://bugzilla.kernel.org/show_bug.cgi?id=199917

Could somebody who knows the ropes around here poke the AMD driver team for us?
Thank you!

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[Bug 198713] AMD DC crashes when computing clocks/detecting freesync

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198713

Andrey Grodzovsky (andrey.grodzovsky@amd.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrey.grodzovsky@amd.com

--- Comment #5 from Andrey Grodzovsky (andrey.grodzovsky@amd.com) ---
It's not a crash but a warning over invalid reg fields access - here 
https://elixir.bootlin.com/linux/v4.15.1/source/drivers/gpu/drm/amd/display/dc/dm_services.h#L132

I see you are working with 4.15 kernel, can you take the latest stable from
here - https://www.kernel.org/ and see if problem goes away ? 

For quicker response time you can try submitting tickets to Free Desktop
Bugzilla - 
https://bugs.freedesktop.org/


Andrey

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[Bug 198713] AMD DC crashes when computing clocks/detecting freesync

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198713

--- Comment #6 from Nicholas Johnson (nicholas.johnson@outlook.com.au) ---
If you are referring to my comment, mine was with 4.17 kernel (latest stable
release). I was just commenting on this one (4.15) because it looks like the
same bug, and I am highlighting that they still have not fixed it in 4.17.

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[Bug 198713] AMD DC crashes when computing clocks/detecting freesync

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198713

--- Comment #7 from Andrey Grodzovsky (andrey.grodzovsky@amd.com) ---
Well, the dmesg attached is also from 4.15 kernel so I assumed it's all 4.15.
Anyway, I will Harry from our Display team to take a look at this.

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[Bug 198713] AMD DC crashes when computing clocks/detecting freesync

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198713

--- Comment #8 from Jon (jon@moozaad.co.uk) ---
Updated to 4.17 as per (indirect) request :)


Linux mudkip.farm 4.17.1-6-default #1 SMP PREEMPT Tue Jun 12 09:55:31 UTC 2018
(e721478) x86_64 x86_64 x86_64 GNU/Linux

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[Bug 198713] AMD DC crashes when computing clocks/detecting freesync

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198713

--- Comment #9 from Jon (jon@moozaad.co.uk) ---
Created attachment 276531
  --> https://bugzilla.kernel.org/attachment.cgi?id=276531&action=edit
dmesg for kernel 4.17 showing warnings with traces

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