linux-kernel - Re: [PATCH] drm/amdgpu: disable ASPM for legacy products that don't support ASPM

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Date:   Fri, 8 Apr 2022 11:19:54 -0500
From:   "Gong, Richard" <richard.gong@....com>
To:     "Limonciello, Mario" <Mario.Limonciello@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>
Cc:     "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amdgpu: disable ASPM for legacy products that don't
 support ASPM


On 4/8/2022 10:47 AM, Limonciello, Mario wrote:
> [Public]
>
>
>
>> -----Original Message-----
>> From: Gong, Richard <Richard.Gong@....com>
>> Sent: Friday, April 8, 2022 10:45
>> To: Deucher, Alexander <Alexander.Deucher@....com>; Koenig, Christian
>> <Christian.Koenig@....com>; Pan, Xinhui <Xinhui.Pan@....com>;
>> airlied@...ux.ie; daniel@...ll.ch
>> Cc: amd-gfx@...ts.freedesktop.org; dri-devel@...ts.freedesktop.org; linux-
>> kernel@...r.kernel.org; Limonciello, Mario <Mario.Limonciello@....com>;
>> Gong, Richard <Richard.Gong@....com>
>> Subject: [PATCH] drm/amdgpu: disable ASPM for legacy products that don't
>> support ASPM
>>
>> Active State Power Management (ASPM) feature is enabled since kernel
>> 5.14.
>> However there are some legacy products (WX3200 and RX640 are examples)
>> that
>> do not support ASPM. Use them as video/display output and system would
>> hang
>> during suspend/resume.
>>
>> Add extra check to disable ASPM for old products that don't have
>> ASPM support.
>>
>> Signed-off-by: Richard Gong <richard.gong@....com>
>> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1885
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> index bb1c025d9001..8987107f41ee 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> @@ -2012,6 +2012,10 @@ static int amdgpu_pci_probe(struct pci_dev
>> *pdev,
>>   	if (amdgpu_aspm == -1 && !pcie_aspm_enabled(pdev))
>>   		amdgpu_aspm = 0;
>>
>> +	/* disable ASPM for the legacy products that don't support ASPM */
>> +	if ((flags & AMD_ASIC_MASK) == CHIP_POLARIS12)
>> +		amdgpu_aspm = 0;
>> +
> I think it's problematic to disable it for the entire driver.  There might be multiple
> AMDGPUs in the system, and others may support ASPM.

The "problem" are WX3200 and RX640, both are from the same POLARIS12 family.

> Can it be done just as part of probe for Polaris?
>
>>   	if (amdgpu_virtual_display ||
>>   	    amdgpu_device_asic_has_dc_support(flags & AMD_ASIC_MASK))
>>   		supports_atomic = true;
>> --
>> 2.25.1