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

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Date:   Mon, 11 Apr 2022 09:41:41 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Richard Gong <richard.gong@....com>
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

[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, 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