[Bug 107456] WARNING: CPU: 11 PID: 1137 at drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:88 dm_dp_aux_transfer+0xa5/0xc0 [amdgpu]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107456

            Bug ID: 107456
           Summary: WARNING: CPU: 11 PID: 1137 at
                    drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu
                    _dm_mst_types.c:88 dm_dp_aux_transfer+0xa5/0xc0
                    [amdgpu]
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: marc at dragonfly.plus.com

Created attachment 140936
  --> https://bugs.freedesktop.org/attachment.cgi?id=140936&action=edit
dmesg output

I see the following warning during boot with Linux kernel 4.18.0-rc6 & 4.17.10:

root at deepthought:~# dmesg | grep WARN
[    9.346100] WARNING: CPU: 11 PID: 1137 at
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:88
dm_dp_aux_transfer+0xa5/0xc0 [amdgpu]
[    9.346162] WARNING: CPU: 14 PID: 1139 at
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:88
dm_dp_aux_transfer+0xa5/0xc0 [amdgpu]


Hardware is Ryzen 7 2700x, Sapphire Technology Radeon RX 480, IIyama ProLite
XB2380HS connected via DVI.

It looks like "dm_dp_aux_transfer" is used to setup DisplayPort, using "struct
drm_dp_aux_msg — DisplayPort AUX channel transaction". Now, with my hardware I
don't have any monitors connected via DisplayPort. Is that relevant?

I patched in a "printk("msg->size = %d\n", msg->size);" and it displays the
result twice, which is curious.

# dmesg | grep -i "msg->size"
[    9.469511] msg->size = -5
[    9.469803] msg->size = -5

Anyway, full "dmesg" attached.

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