usb: mtu3: enable auto switch from U3 to U2

inform mac2 to build U2 link automatically after U3 detect
fail without software setting soft_connect.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/usb/mtu3/mtu3_core.c b/drivers/usb/mtu3/mtu3_core.c
index 603b7f84d31e..c0efc07ef4a5 100644
--- a/drivers/usb/mtu3/mtu3_core.c
+++ b/drivers/usb/mtu3/mtu3_core.c
@@ -575,6 +575,8 @@ static void mtu3_regs_init(struct mtu3 *mtu)
                                 SW_U1_REQUEST_ENABLE | SW_U2_REQUEST_ENABLE);
                 /* device responses to u3_exit from host automatically */
                 mtu3_clrbits(mbase, U3D_LTSSM_CTRL, SOFT_U3_EXIT_EN);
+                /* automatically build U2 link when U3 detect fail */
+                mtu3_setbits(mbase, U3D_USB2_TEST_MODE, U2U3_AUTO_SWITCH);
         }
 
         mtu3_set_speed(mtu);