TX_HW_FLOW_CTL_EN  853 drivers/tty/serial/sprd_serial.c 	fc &= ~(RX_HW_FLOW_CTL_THLD | RX_HW_FLOW_CTL_EN | TX_HW_FLOW_CTL_EN);
TX_HW_FLOW_CTL_EN  857 drivers/tty/serial/sprd_serial.c 		fc |= TX_HW_FLOW_CTL_EN;