Patch "serial: mxs-auart: Fix baudrate calculation" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

serial: mxs-auart: Fix baudrate calculation

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
serial-mxs-auart-fix-baudrate-calculation.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <[email protected]>
Date: Mon, 20 Mar 2017 10:05:38 +0100
Subject: serial: mxs-auart: Fix baudrate calculation
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Uwe Kleine-König <[email protected]>

commit a6040bc610554c66088fda3608ae5d6307c548e4 upstream.

The reference manual for the i.MX28 recommends to calculate the divisor as

divisor = (UARTCLK * 32) / baud rate, rounded to the nearest integer

, so let's do this. For a typical setup of UARTCLK = 24 MHz and baud rate = 115200 this changes the divisor from 6666 to 6667 and so the actual baud rate improves from 115211.521 Bd (error ≅ 0.01 %) to 115194.240 Bd (error ≅ 0.005 %).

---
 drivers/tty/serial/mxs-auart.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -1085,7 +1085,7 @@ static void mxs_auart_settermios(struct
 					AUART_LINECTRL_BAUD_DIV_MAX);
 		baud_max = u->uartclk * 32 / AUART_LINECTRL_BAUD_DIV_MIN;
 		baud = uart_get_baud_rate(u, termios, old, baud_min, baud_max);
-		div = u->uartclk * 32 / baud;
+		div = DIV_ROUND_CLOSEST(u->uartclk * 32, baud);
 	}
 
 	ctrl |= AUART_LINECTRL_BAUD_DIVFRAC(div & 0x3F);

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/serial-mxs-auart-fix-baudrate-calculation.patch