[Bug 212655] New: AMDGPU crashes when resuming from suspend when amd_iommu=on

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=212655

            Bug ID: 212655
           Summary: AMDGPU crashes when resuming from suspend when
                    amd_iommu=on
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.11.10-1
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: fjfcavalcanti at gmail.com
        Regression: No

So, my setup is the following:

Manjaro Linux on kernel 5.11.10, but also tested on pop OS and it also happens.
Mb MSI Tomahawk B450
Ryzen 5 3600
GPU Radeon RX5700 (Powercolor Red Devil)

I tried multiple kernels from 5.9 to 5.12 and all had the same issue, if I turn
on iommu AMDGPU crashes during resume, and I have to hard-reset the system (I
cant reset it using shutdown -r for example)

What I see in DMESG after resume is the following:

[   36.492418] amdgpu 0000:28:00.0: amdgpu: failed send message:     RunBtc
(58)        param: 0x00000000 response 0xffffffc2
[   36.492420] amdgpu 0000:28:00.0: amdgpu: RunBtc failed!
[   36.492421] amdgpu 0000:28:00.0: amdgpu: Failed to setup smc hw!
[   36.492422] [drm:amdgpu_device_ip_resume_phase2 [amdgpu]] *ERROR* resume of
IP block <smu> failed -62
[   36.492515] amdgpu 0000:28:00.0: amdgpu: amdgpu_device_ip_resume failed
(-62).
[   36.492516] PM: dpm_run_callback(): pci_pm_resume+0x0/0xe0 returns -62
[   36.492520] PM: Device 0000:28:00.0 failed to resume async: error -62

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