linux-kernel - Re: [PATCH] drm/amdgpu: Fix rejecting Tahiti GPUs

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Date:   Fri, 14 Jan 2022 09:56:26 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     Lukas Fink <lukas.fink1@...il.com>
Cc:     "Deucher, Alexander" <alexander.deucher@....com>,
        Christian Koenig <christian.koenig@....com>,
        xinhui pan <Xinhui.Pan@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>
Subject: Re: [PATCH] drm/amdgpu: Fix rejecting Tahiti GPUs

On Fri, Jan 14, 2022 at 3:27 AM Lukas Fink <lukas.fink1@...il.com> wrote:
>
> eb4fd29afd4a ("drm/amdgpu: bind to any 0x1002 PCI diplay class device") added
> generic bindings to amdgpu so that that it binds to all display class devices
> with VID 0x1002 and then rejects those in amdgpu_pci_probe.
>
> Unfortunately it reuses a driver_data value of 0 to detect those new bindings,
> which is already used to denote CHIP_TAHITI ASICs.
>
> The driver_data value given to those new bindings was changed in
> dd0761fd24ea1 ("drm/amdgpu: set CHIP_IP_DISCOVERY as the asic type by default")
> to CHIP_IP_DISCOVERY (=36), but it seems that the check in amdgpu_pci_probe
> was forgotten to be changed. Therefore, it still rejects Tahiti GPUs.
>
> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1860
> Fixes: eb4fd29afd4a ("drm/amdgpu: bind to any 0x1002 PCI diplay class device")
>
> Signed-off-by: Lukas Fink <lukas.fink1@...il.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> index 9ec58bf74012..224d073022ac 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> @@ -1903,7 +1903,7 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
>                         return -ENODEV;
>         }
>
> -       if (flags == 0) {
> +       if (flags == CHIP_IP_DISCOVERY) {
>                 DRM_INFO("Unsupported asic.  Remove me when IP discovery init is in place.\n");
>                 return -ENODEV;
>         }

Thanks.  Actually this entire check can be removed at this point.  The
IP discovery support is in place.  I'll send a patch.

Alex


> --
> 2.34.1
>