[Bug 214963] New: [amdgpu] resuming from suspend fails when IOMMU is missing

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https://bugzilla.kernel.org/show_bug.cgi?id=214963

            Bug ID: 214963
           Summary: [amdgpu] resuming from suspend fails when IOMMU is
                    missing
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.15.0, 5.15.1
          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: spasswolf@web.de
        Regression: No

On the HP bw064-ng Laptop the BIOS does not correctly initialize the IOMMU.
This brakes resuming from suspend:
Nov  7 23:23:02 bart kernel: [   96.378265] kfd kfd: amdgpu: Failed to resume
IOMMU for device 1002:9874
Nov  7 23:23:02 bart kernel: [   96.378271] amdgpu 0000:00:01.0: amdgpu:
amdgpu_device_ip_resume failed (-6).
Nov  7 23:23:02 bart kernel: [   96.378274] PM: dpm_run_callback():
pci_pm_resume+0x0/0x110 returns -6
Nov  7 23:23:02 bart kernel: [   96.378283] amdgpu 0000:00:01.0: PM: failed to
resume async: error -6

leading to the follow up errors:
Nov 7 23:23:03 bart kernel: [   97.580799] [drm]
perform_link_training_with_retries: Link training attempt 1 of 4 failed
...
Nov  7 23:23:04 bart kernel: [   98.646241] [drm]
perform_link_training_with_retries: Link training attempt 2 of 4 failed
...
Nov  7 23:23:05 bart kernel: [   99.709472] [drm]
perform_link_training_with_retries: Link training attempt 3 of 4 failed
Nov  7 23:23:06 bart kernel: [  100.772840] [drm] enabling link 0 failed: 15
Nov  7 23:23:22 bart kernel: [  106.160854] [drm:amdgpu_dm_atomic_commit_tail
[amdgpu]] *ERROR* Waiting for fences timed out!
Nov  7 23:23:22 bart kernel: [  116.397484]
[drm:drm_atomic_helper_wait_for_flip_done] *ERROR* [CRTC:47:crtc-0] flip_done
timed out

Simply changing the amdgpu_device_ip function in
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c to
static int amdgpu_device_ip_resume(struct amdgpu_device *adev)
{
        int r;

#if 0 
        r = amdgpu_amdkfd_resume_iommu(adev);
        if (r)
                return r;
#endif

        r = amdgpu_device_ip_resume_phase1(adev);
        if (r)
                return r;

        r = amdgpu_device_fw_loading(adev);
        if (r)
                return r;

        r = amdgpu_device_ip_resume_phase2(adev);

        return r;
}
makes resuming from suspend work for me again. But of course this is not a
viable solution as on systems with working IOMMU this is needed.
One could probably add a flag so that in case of missing IOMMU
amdgpu_amdkfd_resume_iommu returns 0.

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