linux-kernel - Re: Linux 5.7-rc1 reboot/poweroff hangs

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Date:   Fri, 17 Apr 2020 12:12:04 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Prike.Liang@....com, Alexander Deucher <Alexander.Deucher@....com>,
        stable <stable@...r.kernel.org>
Subject: Re: Linux 5.7-rc1 reboot/poweroff hangs

On 4/17/20 12:05 PM, Shuah Khan wrote:
> Hi Linus,
> 
> Linux 5.7-rc1 reboot/powereoff hangs on AMD Ryzen 5 PRO 2400GE
> system.
> 
> I isolated the commit to:
> 
> Revering the following commit fixes the problem.
> 
> commit 487eca11a321ef33bcf4ca5adb3c0c4954db1b58
> Author: Prike Liang <Prike.Liang@....com>
> Date:   Tue Apr 7 20:21:26 2020 +0800
> 
>      drm/amdgpu: fix gfx hang during suspend with video playback (v2)
> 
>      The system will be hang up during S3 suspend because of SMU is
>      pending for GC not respose the register CP_HQD_ACTIVE access
>      request.This issue root cause of accessing the GC register under
>      enter GFX CGGPG and can be fixed by disable GFX CGPG before perform
>      suspend.
> 

I can send a revert, however it appears this is a fix for a suspend
hang.

thanks,
-- Shuah