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

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

[bugzilla-daemon]

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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@lists.freedesktop.org
          Reporter: pmenzel+bugs.freedesktop@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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[Bug 105030] `radeon_ib_ring_tests()` takes 1.5 s during resume

[bugzilla-daemon]

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

Christian König <ckoenig.leichtzumerken@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTABUG
             Status|NEW                         |RESOLVED

--- Comment #1 from Christian König <ckoenig.leichtzumerken@gmail.com> ---
You could bisect, but I would say in general that is desired behavior.

We must make sure that the hardware is correctly powered up before continuing
here.

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

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

--- Comment #2 from Paul Menzel <pmenzel+bugs.freedesktop@molgen.mpg.de> ---
(In reply to Christian König from comment #1)
> You could bisect, but I would say in general that is desired behavior.
> 
> We must make sure that the hardware is correctly powered up before
> continuing here.

Are you sure, that the hardware is correctly probed and this is not some kind
of error? It would be a really buggy hardware design, if it had to take that
long. That’s longer then coreboot takes on devices, and you will have big
problems to meet Google Chromebook and -boxes standards, and to be chosen as a
probable device.

Also, debugging such issues should be made easier.

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