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

[Christian König]

Am 05.01.21 um 17:11 schrieb 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?

Ups, indeed! Thanks for pointing that out.

Christian.

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