[PATCH v9 1/6] thunderbolt: Allow NVM upgrade of USB4 host routers

[Mika Westerberg <mika.westerberg@linux.intel.com>]

From: Szuying Chen <Chloe_Chen@asmedia.com.tw>

Intel pre-USB4 host routers required the firmware connection manager to
be active in order to perform NVM firmware upgrade and for this reason
it was disabled when software connection manager is active. However,
this is not necessary for USB4 host routers as this functionality is
part of router operations that the router implements if it wants to
support this.

Signed-off-by: Szuying Chen <Chloe_Chen@asmedia.com.tw>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
 drivers/thunderbolt/tb.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 4a659cea26f7..462845804427 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -1442,8 +1442,11 @@ static int tb_start(struct tb *tb)
 	 * ICM firmware upgrade needs running firmware and in native
 	 * mode that is not available so disable firmware upgrade of the
 	 * root switch.
+	 *
+	 * However, USB4 routers support NVM firmware upgrade if they
+	 * implement the necessary router operations.
 	 */
-	tb->root_switch->no_nvm_upgrade = true;
+	tb->root_switch->no_nvm_upgrade = !tb_switch_is_usb4(tb->root_switch);
 	/* All USB4 routers support runtime PM */
 	tb->root_switch->rpm = tb_switch_is_usb4(tb->root_switch);
 
-- 
2.35.1