linux-kernel - [PATCH 13/25] serial: sh-sci: Take into account sampling rate for max baud rate

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Message-Id: <1447958344-836-14-git-send-email-geert+renesas@glider.be>
Date:	Thu, 19 Nov 2015 19:38:52 +0100
From:	Geert Uytterhoeven <geert+renesas@...der.be>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Simon Horman <horms@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Cc:	linux-serial@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH 13/25] serial: sh-sci: Take into account sampling rate for max baud rate

The maximum baud rate depends on the sampling rate.
HSCIF has a variable sampling rate and sets s->sampling_rate to zero,
hence use the minimum sampling rate of 8.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 drivers/tty/serial/sh-sci.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index dccea5df5355076a..d82735dd62ae38d8 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1961,7 +1961,10 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
 	 * that the previous boot loader has enabled required clocks and
 	 * setup the baud rate generator hardware for us already.
 	 */
-	max_baud = port->uartclk ? port->uartclk / 16 : 115200;
+	if (port->uartclk)
+		max_baud = port->uartclk / max(s->sampling_rate, 8U);
+	else
+		max_baud = 115200;
 
 	baud = uart_get_baud_rate(port, termios, old, 0, max_baud);
 	if (likely(baud && port->uartclk))
-- 
1.9.1

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