3.2.91-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Uwe Kleine-König <u.kleine-koe...@pengutronix.de>
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 %).
Signed-off-by: Uwe Kleine-König <u.kleine-koe...@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
[bwh: Backported to 3.2: adjust context, indentation]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
drivers/tty/serial/mxs-auart.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -366,7 +366,7 @@ static void mxs_auart_settermios(struct
baud_min = DIV_ROUND_UP(u->uartclk * 32, 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);
ctrl |= AUART_LINECTRL_BAUD_DIVINT(div >> 6);
