[Bug 105030] `radeon_ib_ring_tests()` takes 1.5 s during resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105030

            Bug ID: 105030
           Summary: `radeon_ib_ring_tests()` takes 1.5 s during resume
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: pmenzel+bugs.freedesktop at molgen.mpg.de

Created attachment 137254
  --> https://bugs.freedesktop.org/attachment.cgi?id=137254&action=edit
Linux 4.14.13 messages

On a Asus F2A85-M PRO with an AMD A6-6400K APU with Radeon HD Graphics and
Linux 4.14.13 there is a regression, that resume time of the radeon module is
two seconds. `sleepgraph.py` [1] is used to benchmark this.

> radeon @ 0000:00:01.0 {radeon} async_device (Total Suspend: 304.076 ms Total Resume: 2138.431 ms)

The call below causes this.

> radeon_ib_ring_tests [radeon] (1589.415 ms @ 6905.136004)

[1] https://01.org/suspendresume
[2] https://github.com/01org/pm-graph

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