Exit mux mode


I am using Q2687 together with WM RIL.
Based on the design of the mux driver, everytime it restart (due to s/w or h/w reset), it requires the module back to AT mode instead of mux mode.
But when i power up and perform the reset to the module, it still in the mux mode (can see the mux_test_string). How to force the module back to AT mode without waiting for it to time out or specifically send DISC packet.