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

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Message-ID: <192375d0-85ac-ced0-43d6-e5ea4e3c0fae@amd.com>
Date:   Mon, 11 Apr 2022 06:38:57 -0500
From:   "Gong, Richard" <richard.gong@....com>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
        xinhui.pan@....com, linux-kernel@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, mario.limonciello@....com,
        daniel@...ll.ch, alexander.deucher@....com,
        christian.koenig@....com, Dell.Client.Kernel@...l.com
Subject: Re: [PATCHv2] drm/amdgpu: disable ASPM on Intel AlderLake based
 systems

Hi Paul,

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

Regards,

Richard

> 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