linux-kernel - [PATCH AUTOSEL 4.9 013/107] serial: fsl_lpuart: clear parity enable bit when disable parity

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Message-Id: <20190128161947.57405-13-sashal@kernel.org>
Date:   Mon, 28 Jan 2019 11:18:13 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Andy Duan <fugang.duan@....com>, Lukas Wunner <lukas@...ner.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, linux-serial@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 013/107] serial: fsl_lpuart: clear parity enable bit when disable parity

From: Andy Duan <fugang.duan@....com>

[ 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 e2ec04904f54..5c471c3481bd 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1344,6 +1344,8 @@ 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 */
@@ -1487,6 +1489,8 @@ 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