From 15dd287b28b959d6c16d2f7e49aab75a80749ec8 Mon Sep 17 00:00:00 2001 From: Andrey Smirnov Date: Mon, 29 Jul 2019 12:52:10 -0700 Subject: [PATCH] tty: serial: fsl_lpuart: Fix issue in software flow control Although I haven't observed this bug in practice, it seems that the code for handling x_char of LPUART is pretty much identical to that of i.MX. So the fix found in commit 7e2fb5aa8d81 ("serial: imx: Fix issue in software flow control"): serial: imx: Fix issue in software flow control After send out x_char in UART driver, x_char needs to be cleared by UART driver itself, otherwise data in TXFIFO can no longer be sent out. Also tx counter needs to be increased to keep track of correct number of transmitted data. Signed-off-by: Jiada Wang Signed-off-by: Greg Kroah-Hartman should apply here as well. Signed-off-by: Andrey Smirnov Cc: Stefan Agner Cc: Bhuvanchandra DV Cc: Chris Healy Cc: Cory Tusar Cc: Lucas Stach Cc: Greg Kroah-Hartman Cc: Jiri Slaby Cc: linux-imx@nxp.com Cc: linux-serial@vger.kernel.org Cc: linux-kernel@vger.kernel.org Link: https://lore.kernel.org/r/20190729195226.8862-9-andrew.smirnov@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/fsl_lpuart.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index c35f81df0cff..8657addbfd1c 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -782,6 +782,8 @@ static void lpuart_txint(struct lpuart_port *sport) lpuart32_write(&sport->port, sport->port.x_char, UARTDATA); else writeb(sport->port.x_char, sport->port.membase + UARTDR); + sport->port.icount.tx++; + sport->port.x_char = 0; goto out; } -- GitLab