linux-kernel - [PATCH 4.4 042/230] serial: fsl_lpuart: fix maximum acceptable baud rate with over-sampling

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Message-Id: <20190322111239.659370778@linuxfoundation.org>
Date:   Fri, 22 Mar 2019 12:13:00 +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,
        Tomonori Sakita <tomonori.sakita@...d.co.jp>,
        Atsushi Nemoto <atsushi.nemoto@...d.co.jp>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 042/230] serial: fsl_lpuart: fix maximum acceptable baud rate with over-sampling

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

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

[ Upstream commit 815d835b7ba46685c316b000013367dacb2b461b ]

Using over-sampling ratio, lpuart can accept baud rate upto uartclk / 4.

Signed-off-by: Tomonori Sakita <tomonori.sakita@...d.co.jp>
Signed-off-by: Atsushi Nemoto <atsushi.nemoto@...d.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.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 8b5ec9386f0f4..1544a7cc76ff8 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1409,7 +1409,7 @@ lpuart32_set_termios(struct uart_port *port, struct ktermios *termios,
 	}
 
 	/* ask the core to calculate the divisor */
-	baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
+	baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 4);
 
 	spin_lock_irqsave(&sport->port.lock, flags);
 
-- 
2.19.1