From: Tomonori Sakita <tomonori.sakita@sord.co.jp>
Date: Mon, 21 Jan 2019 08:34:16 +0000 (+0900)
Subject: serial: fsl_lpuart: fix maximum acceptable baud rate with over-sampling
X-Git-Tag: v4.14.105~24
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=0baaa08d1e3a68f3ef92ab71aac18c56b51c6430;p=users%2Fjedix%2Flinux-maple.git

serial: fsl_lpuart: fix maximum acceptable baud rate with over-sampling

[ Upstream commit 815d835b7ba46685c316b000013367dacb2b461b ]

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

Signed-off-by: Tomonori Sakita <tomonori.sakita@sord.co.jp>
Signed-off-by: Atsushi Nemoto <atsushi.nemoto@sord.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 716c33b2a11c..32a473f9d1d3 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1701,7 +1701,7 @@ 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);