This is a note to let you know that I've just added the patch titled

tty: serial: fsl_lpuart: fix lpuart32_poll_get_char

to my tty git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git in the tty-testing branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will be merged to the tty-next branch sometime soon, after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.

From 29788ab1d2bf26c130de8f44f9553ee78a27e8d5 Mon Sep 17 00:00:00 2001

From: Peng Fan peng.fan@nxp.com Date: Tue, 29 Sep 2020 17:55:09 +0800 Subject: tty: serial: fsl_lpuart: fix lpuart32_poll_get_char

The watermark is set to 1, so we need to input two chars to trigger RDRF using the original logic. With the new logic, we could always get the char when there is data in FIFO.

Suggested-by: Fugang Duan fugang.duan@nxp.com Signed-off-by: Peng Fan peng.fan@nxp.com Link: https://lore.kernel.org/r/20200929095509.21680-1-peng.fan@nxp.com Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/fsl_lpuart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 645bbb24b433..590c901a1fc5 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -680,7 +680,7 @@ static void lpuart32_poll_put_char(struct uart_port *port, unsigned char c)

static int lpuart32_poll_get_char(struct uart_port *port) { - if (!(lpuart32_read(port, UARTSTAT) & UARTSTAT_RDRF)) + if (!(lpuart32_read(port, UARTWATER) >> UARTWATER_RXCNT_OFF)) return NO_POLL_CHAR;

return lpuart32_read(port, UARTDATA);