On Tue, Jan 07, 2025 at 03:48:34PM +0800, Sherry Sun wrote: > Need to flush UART RX and TX FIFO when lpuart is shutting down to make > sure restore a clean data transfer environment. why not flush it at open()? Frank > > 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 >
