ATH_P2P_PS_STOP_TIME
target_tsf -= ATH_P2P_PS_STOP_TIME;
target_tsf += ATH_P2P_PS_STOP_TIME;
if (target_tsf - tsf < ATH_P2P_PS_STOP_TIME)
target_tsf = tsf + ATH_P2P_PS_STOP_TIME;
tsf += ATH_P2P_PS_STOP_TIME;
tsf -= ATH_P2P_PS_STOP_TIME;