[PATCH 4/4] PCI: add a REBAR size quirk for Sapphire RX 5600 XT Pulse.

[Ilia Mirkin]

On Tue, Jan 5, 2021 at 8:44 AM Christian König
<ckoenig.leichtzumerken at gmail.com> wrote:
>
> Otherwise the CPU can't fully access the BAR.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>
> ---
>  drivers/pci/pci.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 16216186b51c..b66e4703c214 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -3577,7 +3577,14 @@ u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar)
>                 return 0;
>
>         pci_read_config_dword(pdev, pos + PCI_REBAR_CAP, &cap);
> -       return (cap & PCI_REBAR_CAP_SIZES) >> 4;
> +       cap = (cap & PCI_REBAR_CAP_SIZES) >> 4;
> +
> +       /* Sapphire RX 5600 XT Pulse has an invalid cap dword for BAR 0 */
> +       if (pdev->vendor == PCI_VENDOR_ID_ATI && pdev->device == 0x731f &&
> +           bar == 0 && cap == 0x700)
> +               cap == 0x7f00;

Perhaps you meant cap = 0x7f00?

> +
> +       return cap;
>  }
>  EXPORT_SYMBOL(pci_rebar_get_possible_sizes);
>
> --
> 2.25.1
>
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