RX_HFC_THLD_DEF   755 drivers/tty/serial/sprd_serial.c 	fc |= RX_TOUT_THLD_DEF | RX_HFC_THLD_DEF;
RX_HFC_THLD_DEF   867 drivers/tty/serial/sprd_serial.c 	fc |= RX_TOUT_THLD_DEF | RX_HFC_THLD_DEF;