Created attachment 140811 [details]
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