diff options
| author | Sherry Sun <sherry.sun@nxp.com> | 2025-01-07 15:48:34 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-01-07 11:50:05 +0100 |
| commit | d78a89990986a4d7d34313d3f58f8596b8ae1222 (patch) | |
| tree | bcc71c56d284ffa59cd5fd4e7ec0773c687cf83d | |
| parent | 79d65fda55cf1a6dac96a69913cd2294a3d8948a (diff) | |
tty: serial: fsl_lpuart: flush RX and TX FIFO when lpuart shutdown
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@nxp.com>
Link: https://lore.kernel.org/r/20250107074834.3115230-1-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 5 |
1 files changed, 5 insertions, 0 deletions
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); |