The Mass storage gadget uses another thread (fsg_main_thread) to
disable endpoint after disconnecting with host, if it switches
host as soon as disconnecting the gadget (through sysfs role interface),
the system will hang due to access register during the controller
reset. There is no better way to wait fsg_main_thread to complete
at UDC driver, as a workaround, it adds some delay to wait the
thread has completed. The similar method is used when the cable
is disconnected from the host, and 20ms delay has probed no issue.
Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
49f5ac5c8a