[Bug 107376] Raven: `flush_delayed_work()` takes 500 ms

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107376

            Bug ID: 107376
           Summary: Raven: `flush_delayed_work()` takes 500 ms
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: pmenzel+bugs.freedesktop at molgen.mpg.de

Created attachment 140811
  --> https://bugs.freedesktop.org/attachment.cgi?id=140811&action=edit
HTML output of `sudo ./sleepgraph.py -config config/suspend-callgraph.cfg`
(devicelist: amdgpu, maxdepth: 12)

Created attachment 140810 [details]
HTML output of `sudo ./sleepgraph.py -config config/suspend-callgraph.cfg`
(devicelist: amdgpu, maxdepth: 12)

Profiling the suspend and resume time [1] on a MSI B350M MORTAR (MS-7A37) with
AMD Ryzen 3 2200G with Radeon Vega Graphics with Linux 4.18-rc6+ and
amd-staging-drm-next [2], `pci_pm_suspend()` takes over one second, which is
too long [3], cf. bug 107278 [3].

This is spent in `amdgpu_device_ip_resume_phase2()`, where 505 ms are spent in
`flush_delayed_work()`.

•   flush_delayed_work (505.026 ms @ 98.640854)
    […]
    •   flush_work (505.017 ms @ 98.640863)
        […]
        •   wait_for_completion (504.985 ms @ 98.640894)
            […]
            •    schedule_timeout (504.963 ms @ 98.640914)
                 […]
                 •   schedule (504.963 ms @ 98.640914)

[1]: https://01.org/suspendresume
[2]: https://cgit.freedesktop.org/~agd5f/linux/log/?h=amd-staging-drm-next
[3]: https://bugs.freedesktop.org/show_bug.cgi?id=107278

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