https://bugs.freedesktop.org/show_bug.cgi?id=105324

            Bug ID: 105324
           Summary: R9 285 weston hangs since drm/amd/pp: Fix bug that dpm
                    level was not really locked
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: adf.li...@gmail.com

R9 285 Tonga,  testing with amdgpu.dc=0 on agd5f 4.17-wip

Since

commit a02497b73218f10f237d98fb10d34d0baed607a0
Author: Rex Zhu <rex....@amd.com>
Date:   Fri Feb 9 16:47:53 2018 +0800

    drm/amd/pp: Fix bug that dpm level was not really locked

    Lock the dpm levels when we use SW method to modify
    the dpm tables directly to avoid a possible race
    with the smu.

weston may hang display on start/quit/vt switch

SysRq works and logged will be errors like -

Mar  2 00:19:03 ph4 kernel: amdgpu: [powerplay] 
Mar  2 00:19:03 ph4 kernel:  failed to send message 18b ret is 0 
Mar  2 00:19:03 ph4 kernel: amdgpu: [powerplay] 
Mar  2 00:19:03 ph4 kernel:  failed to send pre message 18a ret is 0 
Mar  2 00:19:04 ph4 kernel: amdgpu: [powerplay] 
Mar  2 00:19:04 ph4 kernel:  failed to send message 18a ret is 0 
Mar  2 00:19:04 ph4 kernel: amdgpu: [powerplay] 
Mar  2 00:19:04 ph4 kernel:  failed to send pre message 18c ret is 0 
Mar  2 00:19:04 ph4 kernel: amdgpu: [powerplay] 
Mar  2 00:19:04 ph4 kernel:  failed to send message 18c ret is 0 
Mar  2 00:19:05 ph4 kernel: amdgpu: [powerplay] 
Mar  2 00:19:05 ph4 kernel:  failed to send pre message 145 ret is 0 
Mar  2 00:19:05 ph4 kernel: amdgpu: [powerplay] 
Mar  2 00:19:05 ph4 kernel:  failed to send message 145 ret is 0 
Mar  2 00:19:06 ph4 kernel: amdgpu: [powerplay] 
Mar  2 00:19:06 ph4 kernel:  failed to send pre message 146 ret is 0 
Mar  2 00:19:06 ph4 kernel: amdgpu: [powerplay] 
Mar  2 00:19:06 ph4 kernel:  failed to send message 146 ret is 0 
Mar  2 00:19:07 ph4 kernel: amdgpu: [powerplay] 
Mar  2 00:19:07 ph4 kernel:  failed to send pre message 148 ret is 0

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