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 <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/mtu3/mtu3_core.c

···
 				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);