linux-kernel - [PATCH v3] tty: serial: meson: allow baud-rates lower than 9600

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Message-ID: <7cf5ad02-6003-4222-a2cb-030ae613b337@myway.de>
Date:   Sat, 04 Nov 2017 13:36:07 +0100
From:   Thomas Rohloff <v10lator@...ay.de>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Carlo Caione <carlo@...one.org>,
        Kevin Hilman <khilman@...libre.com>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v3] tty: serial: meson: allow baud-rates lower than 9600

Devices like DCF77 receivers need the baud-rate to be as low as 50.

I have tested this on a Meson GXL device with uart_A.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jslaby@...e.com>
Cc: Carlo Caione <carlo@...one.org>
Cc: Kevin Hilman <khilman@...libre.com>
Cc: linux-amlogic@...ts.infradead.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Thomas Rohloff <v10lator@...ay.de>
---
 drivers/tty/serial/meson_uart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/meson_uart.c 
b/drivers/tty/serial/meson_uart.c
index 07c0f98be3ac..e281ce5d101d 100644
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -362,7 +362,7 @@ static void meson_uart_set_termios(struct uart_port 
*port,
 
 	writel(val, port->membase + AML_UART_CONTROL);
 
-	baud = uart_get_baud_rate(port, termios, old, 9600, 4000000);
+	baud = uart_get_baud_rate(port, termios, old, 50, 4000000);
 	meson_uart_change_speed(port, baud);
 
 	port->read_status_mask = AML_UART_TX_FIFO_WERR;
-- 
2.13.6