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

On Tue, Jan 5, 2021 at 8:44 AM Christian König ckoenig.leichtzumerken@gmail.com wrote:

Otherwise the CPU can't fully access the BAR.

Signed-off-by: Christian König christian.koenig@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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