PCI: xgene: Fix CRS SV comment

Configuration Request Retry Status ("CRS") must be supported by all PCIe
devices.  CRS Software Visibility is an optional feature that enables a
Root Port to make CRS visible to software by returning a special data value
to complete a config read.

Clarify a comment to say that it is "CRS SV", not "CRS", that can be
enabled.

Link: https://lore.kernel.org/r/20210126213503.2922848-1-helgaas@kernel.orgSigned-off-by: NBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>

drivers/pci/controller/pci-xgene.c

@@ -173,12 +173,13 @@ static int xgene_pcie_config_read32(struct pci_bus *bus, unsigned int devfn,
 
 	/*
 	 * The v1 controller has a bug in its Configuration Request
-	 * Retry Status (CRS) logic: when CRS is enabled and we read the
-	 * Vendor and Device ID of a non-existent device, the controller
-	 * fabricates return data of 0xFFFF0001 ("device exists but is not
-	 * ready") instead of 0xFFFFFFFF ("device does not exist").  This
-	 * causes the PCI core to retry the read until it times out.
-	 * Avoid this by not claiming to support CRS.
+	 * Retry Status (CRS) logic: when CRS Software Visibility is
+	 * enabled and we read the Vendor and Device ID of a non-existent
+	 * device, the controller fabricates return data of 0xFFFF0001
+	 * ("device exists but is not ready") instead of 0xFFFFFFFF
+	 * ("device does not exist").  This causes the PCI core to retry
+	 * the read until it times out.  Avoid this by not claiming to
+	 * support CRS SV.
 	 */
 	if (pci_is_root_bus(bus) && (port->version == XGENE_PCIE_IP_VER_1) &&
 	    ((where & ~0x3) == XGENE_V1_PCI_EXP_CAP + PCI_EXP_RTCTL))