Re: [Nouveau] [PATCH] PCI: Use pci_reset_bus() in quirk_reset_lenovo_thinkpad_50_nvgpu()

[Ben Skeggs]

On Fri, 2 Aug 2019 at 08:01, Lyude Paul <lyude@xxxxxxxxxx> wrote:
>
> Since quirk_nvidia_hda() was added there's now two nvidia device
> functions on any laptops with nvidia GPUs: the HDA controller, and the
> GPU itself. Unfortunately this has the sideaffect of breaking
> quirk_reset_lenovo_thinkpad_50_nvgpu() since pci_reset_function() was
> using pci_parent_bus_reset() to reset the GPU's respective PCI bus, and
> pci_parent_bus_reset() does not work on busses which have more then a
> single device function present.
>
> So, fix this by simply calling pci_reset_bus() instead which properly
> resets the GPU bus and all device functions under it, including both the
> GPU and the HDA controller.
>
> Fixes: b516ea586d71 ("PCI: Enable NVIDIA HDA controllers")
> Cc: Lukas Wunner <lukas@xxxxxxxxx>
> Cc: Daniel Drake <drake@xxxxxxxxxxxx>
> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Cc: Aaron Plattner <aplattner@xxxxxxxxxx>
> Cc: Peter Wu <peter@xxxxxxxxxxxxx>
> Cc: Ilia Mirkin <imirkin@xxxxxxxxxxxx>
> Cc: Karol Herbst <kherbst@xxxxxxxxxx>
> Cc: Maik Freudenberg <hhfeuer@xxxxxx>
> Cc: linux-pci@xxxxxxxxxxxxxxx
> Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Acked-by: Ben Skeggs <bskeggs@xxxxxxxxxx>

> ---
>  drivers/pci/quirks.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 208aacf39329..44c4ae1abd00 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -5256,7 +5256,7 @@ static void quirk_reset_lenovo_thinkpad_p50_nvgpu(struct pci_dev *pdev)
>          */
>         if (ioread32(map + 0x2240c) & 0x2) {
>                 pci_info(pdev, FW_BUG "GPU left initialized by EFI, resetting\n");
> -               ret = pci_reset_function(pdev);
> +               ret = pci_reset_bus(pdev);
>                 if (ret < 0)
>                         pci_err(pdev, "Failed to reset GPU: %d\n", ret);
>         }
> --
> 2.21.0
>
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