[Bug 100949] Power management problem on CIK/SI

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100949

            Bug ID: 100949
           Summary: Power management problem on CIK/SI
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: luya at fedoraproject.org

Created attachment 131232
  --> https://bugs.freedesktop.org/attachment.cgi?id=131232&action=edit
dmesg boot from X550Z

Recent kernel broke the handling of power management for CIK/SI hybrid laptop
using the latest 4.9.25-20170502 from
https://cgit.freedesktop.org/~agd5f/linux/?h=amd-staging-4.9

Notable highlight:

[   25.671428] kfd kfd: Allocated 3944480 bytes on gart for device(1002:130d)
[   25.671449] kfd kfd: error getting iommu info. is the iommu enabled?
[   25.671493] kfd kfd: Error initializing iommuv2 for device (1002:130d)
[   25.671558] Creating topology SYSFS entries
[   25.671642] kfd kfd: device (1002:130d) NOT added due to errors

[  695.257618] [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* displayport
link status failed
[  695.257654] [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* clock
recovery failed

For a while, suspend/resume will lock up in back screen forcing a hard reset.
Laptop is Asus X500ZE equipped with Kaveri and Hainan dual GPU.

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