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 <[e-mail]>
Signed-off-by: Nirmoy Das <[e-mail]>
Acked-by: Bjorn Helgaas <[e-mail]>
Link: https://patchwork.kernel.org/project/dri-devel/patch/[e-mail]

drivers/pci/pci.c

···
 		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);