PCI: Add a REBAR size quirk for Sapphire RX 5600 XT Pulse

RX 5600 XT Pulse advertises support for BAR 0 being 256MB, 512MB,
or 1GB, but it also supports 2GB, 4GB, and 8GB. Add a rebar
size quirk so that the BAR 0 is big enough to cover complete VARM.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20210107175017.15893-5-nirmoy.das@amd.com

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 99ef277..09b03cf 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3603,7 +3603,14 @@ 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 &= PCI_REBAR_CAP_SIZES;
+
+       /* 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 == 0x7000)
+               cap = 0x3f000;
+
+       return cap >> 4;
 }
 EXPORT_SYMBOL(pci_rebar_get_possible_sizes);