[Bug 111980] Rebbot and shutdown doesn't work on specific hardware

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111980

            Bug ID: 111980
           Summary: Rebbot and shutdown doesn't work on specific hardware
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: not set
          Priority: not set
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: lei.pero at gmail.com

When system shutdown/reboot is initiated, everything works as it should,
journal doesn't show any error and it reaches target reboot (for example),
display shuts down properly, but PC stays powered on (requiring hard reset)
indefinitely.

This happened after kernel upgrade, after bisectiing, commit that was to blame
was bellow, after removing just that specific commit, it would work as
expected:

894c414129a8d9ef1b2de443015e4dde6085f64f is the first bad commit
commit 894c414129a8d9ef1b2de443015e4dde6085f64f
Author: KyleMahlkuch <kmahlkuc at linux.vnet.ibm.com>
Date:   Wed Jul 31 17:10:14 2019 -0500

    drm/radeon: Fix EEH during kexec

    [ Upstream commit 6f7fe9a93e6c09bf988c5059403f5f88e17e21e6 ]

    During kexec some adapters hit an EEH since they are not properly
    shut down in the radeon_pci_shutdown() function. Adding
    radeon_suspend_kms() fixes this issue.

    Signed-off-by: KyleMahlkuch <kmahlkuc at linux.vnet.ibm.com>
    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
    Signed-off-by: Sasha Levin <sashal at kernel.org>

 drivers/gpu/drm/radeon/radeon_drv.c | 8 ++++++++
 1 file changed, 8 insertions(+)

Issue is described here, seems like others have similar issue that might be
connected with this as well:
https://bbs.archlinux.org/viewtopic.php?id=249787

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