linux-kernel - Re: [PATCH 5.15 138/230] drm/amdgpu: bind to any 0x1002 PCI diplay class device

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Date:   Mon, 11 Jul 2022 11:29:53 +0200
From:   Christian König <christian.koenig@....com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alex Deucher <alexander.deucher@....com>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.15 138/230] drm/amdgpu: bind to any 0x1002 PCI diplay
 class device

Hi Greg & Alex

why is that patch picked up for stable? Or are we backporting IP based 
discovery?

If yes, is that wise? IIRC we had quite a number of typos etc.. in the 
initial patches.

Regards,
Christian.

Am 11.07.22 um 11:06 schrieb Greg Kroah-Hartman:
> From: Alex Deucher <alexander.deucher@....com>
>
> [ Upstream commit eb4fd29afd4aa1c98d882800ceeee7d1f5262803 ]
>
> Bind to all 0x1002 GPU devices.
>
> For now we explicitly return -ENODEV for generic bindings.
> Remove this check once IP discovery based checking is in place.
>
> v2: rebase (Alex)
>
> Reviewed-by: Christian König <christian.koenig@....com>
> Signed-off-by: Alex Deucher <alexander.deucher@....com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 15 +++++++++++++++
>   1 file changed, 15 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index f65b4b233ffb..c294081022bd 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -1952,6 +1952,16 @@ static const struct pci_device_id pciidlist[] = {
>   	{0x1002, 0x7424, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_BEIGE_GOBY},
>   	{0x1002, 0x743F, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_BEIGE_GOBY},
>   
> +	{ PCI_DEVICE(0x1002, PCI_ANY_ID),
> +	  .class = PCI_CLASS_DISPLAY_VGA << 8,
> +	  .class_mask = 0xffffff,
> +	  .driver_data = 0 },
> +
> +	{ PCI_DEVICE(0x1002, PCI_ANY_ID),
> +	  .class = PCI_CLASS_DISPLAY_OTHER << 8,
> +	  .class_mask = 0xffffff,
> +	  .driver_data = 0 },
> +
>   	{0, 0, 0}
>   };
>   
> @@ -1999,6 +2009,11 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
>   			return -ENODEV;
>   	}
>   
> +	if (flags == 0) {
> +		DRM_INFO("Unsupported asic.  Remove me when IP discovery init is in place.\n");
> +		return -ENODEV;
> +	}
> +
>   	if (amdgpu_virtual_display ||
>   	    amdgpu_device_asic_has_dc_support(flags & AMD_ASIC_MASK))
>   		supports_atomic = true;