github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-30 18:13:41 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

tty: serial: fsl_lpuart: flush RX and TX FIFO when lpuart shutdown

Browse Source 
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>
This commit is contained in:
Sherry Sun 2025-01-07 15:48:34 +08:00 committed by Greg Kroah-Hartman
parent 79d65fda55
commit d78a899909
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/tty/serial/fsl_lpuart.c
View File

@ -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);