[Bug 104142] Stack trace in runpm when Tonga card powers down

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104142

--- Comment #4 from Mike Lothian <mike at fireburn.co.uk> ---
Tried again and it looks a little more promising:

0a214e2fb6b0a56519b6d5efab4b21475c233ee0 is the first bad commit
commit 0a214e2fb6b0a56519b6d5efab4b21475c233ee0
Author: Andrey Grodzovsky <Andrey.Grodzovsky at amd.com>
Date:   Thu Jul 13 10:56:48 2017 -0400

    drm/amd/display: Release cached atomic state in S3.

    Fixes memory leak.

    Signed-off-by: Andrey Grodzovsky <Andrey.Grodzovsky at amd.com>
    Reviewed-by: Tony Cheng <Tony.Cheng at amd.com>
    Acked-by: Harry Wentland <Harry.Wentland at amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

:040000 040000 494f25ce4ad407678f88d6c85128905762c9fbfb
fb36845ef2ccca7bf823c9fec4d13d0a6e71ea2b M      drivers

Which makes sense as that's the commit that adds the WARN_ON, I guess that
takes us back to why is there a cached state

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