[Bug 207581] New: [amdgpu] Framebuffer no image CARRIZO and STONEY

[Bug 207581] New: [amdgpu] Framebuffer no image CARRIZO and STONEY

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=207581

            Bug ID: 207581
           Summary: [amdgpu] Framebuffer no image CARRIZO and STONEY
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.4.27
          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: Jan.Burgmeier@unicon-software.com
        Regression: No

Created attachment 288907
  --> https://bugzilla.kernel.org/attachment.cgi?id=288907&action=edit
Path for 5.4.27 to fix framebuffer

Hi,

we have some ancient software which uses DirectFB to draw to the framebuffer
during installation.
After upgrading from kernel 4.14.99 to 5.4.27 the framebuffer stall the GPU and
only a black image was shown. This could be reprocuded on an Igel UD 7
(CARRIZO) and a Lenovo 14w (STONEY) lspci -vv is attached from both devices.

We did some more investigation to find the breaking change please see attached
git bisect log:

6c8d74caa2fa33908ecd07fb1cf1b7bc629b367a is the first bad commit

After finding the bad commit we reverted the changes on the 5.4.27 and
framebuffer started working again. Patch for reverting is also attached.

Kind regards,
Jan Burgmeier

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[Bug 207581] [amdgpu] Framebuffer no image CARRIZO and STONEY

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=207581

--- Comment #1 from Jan Burgmeier (Jan.Burgmeier@unicon-software.com) ---
Created attachment 288909
  --> https://bugzilla.kernel.org/attachment.cgi?id=288909&action=edit
lspci from lenovo 14w

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[Bug 207581] [amdgpu] Framebuffer no image CARRIZO and STONEY

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=207581

--- Comment #2 from Jan Burgmeier (Jan.Burgmeier@unicon-software.com) ---
Created attachment 288911
  --> https://bugzilla.kernel.org/attachment.cgi?id=288911&action=edit
lspci from IGEL UD7

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[Bug 207581] [amdgpu] Framebuffer no image CARRIZO and STONEY

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=207581

--- Comment #3 from Jan Burgmeier (Jan.Burgmeier@unicon-software.com) ---
Created attachment 288913
  --> https://bugzilla.kernel.org/attachment.cgi?id=288913&action=edit
git bisect log

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[Bug 207581] [amdgpu] Framebuffer no image CARRIZO and STONEY

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=207581

Alex Deucher (alexdeucher@gmail.com) changed:

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

--- Comment #4 from Alex Deucher (alexdeucher@gmail.com) ---
Created attachment 288915
  --> https://bugzilla.kernel.org/attachment.cgi?id=288915&action=edit
possible fix

Reverting will break all systems with limited vram and large displays.  Does
this patch fix the issue?

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[Bug 207581] [amdgpu] Framebuffer no image CARRIZO and STONEY

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=207581

Alex Deucher (alexdeucher@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #288915|0                           |1
        is obsolete|                            |

--- Comment #5 from Alex Deucher (alexdeucher@gmail.com) ---
Created attachment 288919
  --> https://bugzilla.kernel.org/attachment.cgi?id=288919&action=edit
possible fix

This might be a better option.

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[Bug 207581] [amdgpu] Framebuffer no image CARRIZO and STONEY

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=207581

--- Comment #6 from Jan Burgmeier (Jan.Burgmeier@unicon-software.com) ---
Thanks for the quick reply.

The first patch from comment 4 works
The second patch from comment 5 does not work

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