[U-Boot-Users] [PATCH] ColdFire: Fix UART baudrate formula

[Tsi-Chung.Liew]

From: TsiChung Liew <Tsi-Chung.Liew at freescale.com>

The formula "counter = (u32) (gd->bus_clk / gd->baudrate) / 32"
can generate the wrong divisor due to integer division truncation.
Round the calculated divisor value by adding 1/2 the baudrate
before dividing by the baudrate.

Signed-off-by: TsiChung Liew <Tsi-Chung.Liew at freescale.com>
Acked-by: Gerald Van Baren <vanbaren at cideas.com>
---
 drivers/serial/mcfuart.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/serial/mcfuart.c b/drivers/serial/mcfuart.c
index 88f3eb1..5eb4f45 100644
--- a/drivers/serial/mcfuart.c
+++ b/drivers/serial/mcfuart.c
@@ -63,8 +63,8 @@ int serial_init(void)
 	uart->umr = UART_UMR_SB_STOP_BITS_1;
 
 	/* Setting up BaudRate */
-	counter = (u32) (gd->bus_clk / (gd->baudrate));
-	counter >>= 5;
+	counter = (u32) ((gd->bus_clk / 32) + (gd->baudrate / 2));
+	counter = counter / gd->baudrate;
 
 	/* write to CTUR: divide counter upper byte */
 	uart->ubg1 = (u8) ((counter & 0xff00) >> 8);
-- 
1.5.4.1