linux-kernel - [PATCH 4.4 009/143] serial: fsl_lpuart: clear parity enable bit when disable parity

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Message-Id: <20190218133529.499699066@linuxfoundation.org>
Date:   Mon, 18 Feb 2019 14:42:17 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lukas Wunner <lukas@...ner.de>,
        Andy Duan <fugang.duan@....com>,
        Fabio Estevam <festevam@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 009/143] serial: fsl_lpuart: clear parity enable bit when disable parity

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 397bd9211fe014b347ca8f95a8f4e1017bac1aeb ]

Current driver only enable parity enable bit and never clear it
when user set the termios. The fix clear the parity enable bit when
PARENB flag is not set in termios->c_cflag.

Cc: Lukas Wunner <lukas@...ner.de>
Signed-off-by: Andy Duan <fugang.duan@....com>
Reviewed-by: Fabio Estevam <festevam@...il.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/tty/serial/fsl_lpuart.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 01e2274b23f2..8b5ec9386f0f 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1267,6 +1267,8 @@ lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
 			else
 				cr1 &= ~UARTCR1_PT;
 		}
+	} else {
+		cr1 &= ~UARTCR1_PE;
 	}
 
 	/* ask the core to calculate the divisor */
@@ -1402,6 +1404,8 @@ lpuart32_set_termios(struct uart_port *port, struct ktermios *termios,
 			else
 				ctrl &= ~UARTCTRL_PT;
 		}
+	} else {
+		ctrl &= ~UARTCTRL_PE;
 	}
 
 	/* ask the core to calculate the divisor */
-- 
2.19.1