[PATCH] UBUNTU: SAUCE: PCI/ASPM: Add AlderLake ASPM support for links under VMD domain

[Kai-Heng Feng]

[+Cc Anthony, David]

Hi Ping,

On Fri, Jul 23, 2021 at 1:41 PM Ping Bao <pingbao at gmail.com> wrote:
>
> BugLink: https://bugs.launchpad.net/bugs/1889384
>
> Add AlderLake ASPM support for links under VMD to reach deeper power
> saving state.

I was told by David that ADL VMD ASPM should be enabled by BIOS. So
wonder why the patch is necessary?

Kai-Heng

>
> Signed-off-by: Ping Bao <ping.a.bao at intel.com>
> ---
>  drivers/pci/quirks.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index fb13b3109a43..baa727330cdc 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -5650,7 +5650,7 @@ DECLARE_PCI_FIXUP_CLASS_HEADER(0x1ac1, 0x089a,
>                                PCI_CLASS_NOT_DEFINED, 8, apex_pci_fixup_class);
>
>  /*
> - * Device [8086:9a09], [8086:a0b0] and [8086:a0bc]
> + * Device [8086:9a09], [8086:a0b0], [8086:a0bc] and [8086:464d]
>   * BIOS may not be able to access config space of devices under VMD domain, so
>   * it relies on software to enable ASPM for links under VMD.
>   */
> @@ -5658,6 +5658,7 @@ static const struct pci_device_id vmd_bridge_tbl[] = {
>         { PCI_VDEVICE(INTEL, 0x9a09) },
>         { PCI_VDEVICE(INTEL, 0xa0b0) },
>         { PCI_VDEVICE(INTEL, 0xa0bc) },
> +       { PCI_VDEVICE(INTEL, 0x464d) },
>         { }
>  };
>
> --
> 2.25.1
>
>
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