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

[Nirmoy Das]

RX 5600 XT Pulse advertises support for BAR0 being 256MB, 512MB,
or 1GB, but it also supports 2GB, 4GB, and 8GB. Add a rebar
size quirk so that CPU can fully access the BAR0.

Signed-off-by: Christian König <christian.koenig at amd.com>
Reported-by: kernel test robot <lkp at intel.com>
Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
Signed-off-by: Nirmoy Das <nirmoy.das 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..b061bbd4afb1 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 = 0x3f00;
+
+	return cap;
 }
 EXPORT_SYMBOL(pci_rebar_get_possible_sizes);
 
-- 
2.29.2