thunderbolt: Announce USB4 v2 connection manager support

Program the CMUV (Connection Manager USB4 Version) field for USB4 v2 and
v1 routers according to the spec.
Signed-off-by: Gil Fine <gil.fine@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/thunderbolt/switch.c

@@ -2430,9 +2430,13 @@ int tb_switch_configure(struct tb_switch *sw)
 		/*
 		 * For USB4 devices, we need to program the CM version
 		 * accordingly so that it knows to expose all the
-		 * additional capabilities.
+		 * additional capabilities. Program it according to USB4
+		 * version to avoid changing existing (v1) routers behaviour.
 		 */
-		sw->config.cmuv = USB4_VERSION_1_0;
+		if (usb4_switch_version(sw) < 2)
+			sw->config.cmuv = ROUTER_CS_4_CMUV_V1;
+		else
+			sw->config.cmuv = ROUTER_CS_4_CMUV_V2;
 		sw->config.plug_events_delay = 0xa;
 
 		/* Enumerate the switch */

drivers/thunderbolt/tb_regs.h

@@ -195,6 +195,9 @@ struct tb_regs_switch_header {
 
 #define ROUTER_CS_1				0x01
 #define ROUTER_CS_4				0x04
+/* Used with the router cmuv field */
+#define ROUTER_CS_4_CMUV_V1			0x10
+#define ROUTER_CS_4_CMUV_V2			0x20
 #define ROUTER_CS_5				0x05
 #define ROUTER_CS_5_SLP				BIT(0)
 #define ROUTER_CS_5_WOP				BIT(1)