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

[Christian König]

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