Need to flush UART RX and TX FIFO when lpuart is shutting down to make sure restore a clean data transfer environment. Signed-off-by: Sherry Sun <sherry.sun@xxxxxxx> --- drivers/tty/serial/fsl_lpuart.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 7cb1e36fdaab..c91b9d9818cd 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -1965,6 +1965,11 @@ static void lpuart32_shutdown(struct uart_port *port) UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE | UARTCTRL_SBK); lpuart32_write(port, temp, UARTCTRL); + /* flush Rx/Tx FIFO */ + temp = lpuart32_read(port, UARTFIFO); + temp |= UARTFIFO_TXFLUSH | UARTFIFO_RXFLUSH; + lpuart32_write(port, temp, UARTFIFO); + uart_port_unlock_irqrestore(port, flags); lpuart_dma_shutdown(sport); -- 2.34.1
