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

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Am 05.01.21 um 17:11 schrieb Ilia Mirkin:
On Tue, Jan 5, 2021 at 8:44 AM Christian König
<ckoenig.leichtzumerken@xxxxxxxxx> wrote:
Otherwise the CPU can't fully access the BAR.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
  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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