This is a note to let you know that I've just added the patch titled tty: serial: fsl_lpuart: clear LPUART Status Register in lpuart32_shutdown() to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: tty-serial-fsl_lpuart-clear-lpuart-status-register-i.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 9a9bb4dae49f229a02002c8386dc48fb9315055c Author: Sherry Sun <sherry.sun@xxxxxxx> Date: Fri Nov 25 18:19:53 2022 +0800 tty: serial: fsl_lpuart: clear LPUART Status Register in lpuart32_shutdown() [ Upstream commit 4029dfc034febb54f6dd8ea83568accc943bc088 ] The LPUART Status Register needs to be cleared when closing the uart port to get a clean environment when reopening the uart. Fixes: 380c966c093e ("tty: serial: fsl_lpuart: add 32-bit register interface support") Signed-off-by: Sherry Sun <sherry.sun@xxxxxxx> Link: https://lore.kernel.org/r/20221125101953.18753-4-sherry.sun@xxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 262b059e3ee11..110c8720af47a 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -1791,6 +1791,10 @@ static void lpuart32_shutdown(struct uart_port *port) spin_lock_irqsave(&port->lock, flags); + /* clear status */ + temp = lpuart32_read(&sport->port, UARTSTAT); + lpuart32_write(&sport->port, temp, UARTSTAT); + /* disable Rx/Tx DMA */ temp = lpuart32_read(port, UARTBAUD); temp &= ~(UARTBAUD_TDMAE | UARTBAUD_RDMAE);