linux-kernel - Re: [PATCHv2] drm/amdgpu: disable ASPM on Intel AlderLake based systems

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Date:   Mon, 11 Apr 2022 13:45:37 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Richard Gong <richard.gong@....com>
Cc:     airlied@...ux.ie, xinhui.pan@....com, linux-kernel@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        daniel@...ll.ch, alexander.deucher@....com,
        Dell.Client.Kernel@...l.com, christian.koenig@....com,
        mario.limonciello@....com
Subject: Re: [PATCHv2] drm/amdgpu: disable ASPM on Intel AlderLake based
 systems

Dear Richard,


Am 11.04.22 um 13:38 schrieb Gong, Richard:

> On 4/11/2022 2:41 AM, Paul Menzel wrote:
>> [Cc: +<Dell.Client.Kernel@...l.com>]

>> Am 11.04.22 um 02:27 schrieb Gong, Richard:
>>
>>> On 4/8/2022 7:19 PM, Paul Menzel wrote:
>>
>>>> Am 08.04.22 um 21:05 schrieb Richard Gong:
>>>>> Active State Power Management (ASPM) feature is enabled since 
>>>>> kernel 5.14.
>>>>> There are some AMD GFX cards (such as WX3200 and RX640) that cannot be
>>>>> used with Intel AlderLake based systems to enable ASPM. Using these 
>>>>> GFX
>>>>
>>>> Alder Lake
>>> will correct in the next version.
>>>>
>>>>> cards as video/display output, Intel Alder Lake based systems will hang
>>>>> during suspend/resume.
>>>>
>>>> Please reflow for 75 characters per line.
>>>>
>>>> Also please mention the exact system you had problems with (also 
>>>> firmware versions).
>>>>
>>>>>
>>>>> Add extra check to disable ASPM on Intel AlderLake based systems.
>>>>
>>>> Is that a problem with Intel Alder Lake or the Dell system? 
>>>> Shouldn’t ASPM just be disabled for the problematic cards for the 
>>>> Dell system. You write newer cards worked fine.
>>>
>>> There is a problem with Dell system (Dell Precision DT workstation), 
>>> which is based on Intel Alder Lake.
>>>
>>> ASPM works just fine on these GPU's. It's more of an issue with 
>>> whether the underlying platform supports ASPM or not.
>>
>> At least you didn’t document what the real issue is,
> 
> You can refer to bug tag from the comment messages.
> 
> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1885

No, the commit message should be self-contained, and reviewers and 
readers of the commit message not required to read comments of bug 
reports. Please add the necessary information to the commit message.


Kind regards,

Paul


>> that ASPM does not work. With current information (some GPU graphics 
>> card with the the Dell system and others don’t), it could be the GPU, 
>> the Dell system (firmware, …), a problem with Alder Lake SOC, or 
>> another bug. I hope you are in contact with Dell to analyze it, so 
>> ASPM can be enabled again.
>>
>> […]
>>
>>
>> Kind regards,
>>
>> Paul