Round the serial port clock divisor value returned by calc_divisor()
Round the serial port clock divisor value returned by
calc_divisor()
Signed-off-by: Hugo Villeneuve <hugo.villeneuve@lyrtech.com>
Acked-by: Gerald Van Baren <vanbaren@cideas.com>
diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index 4ccaee2..8bbfcf9 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -124,8 +124,6 @@
static int calc_divisor (NS16550_t port)
{
- uint32_t clk_divisor;
-
#ifdef CONFIG_OMAP1510
/* If can't cleanly clock 115200 set div to 1 */
if ((CFG_NS16550_CLK == 12000000) && (gd->baudrate == 115200)) {
@@ -149,15 +147,11 @@
/* Compute divisor value. Normally, we should simply return:
* CFG_NS16550_CLK) / MODE_X_DIV / gd->baudrate
- * but we need to round that value by adding 0.5 (2/4).
+ * but we need to round that value by adding 0.5.
* Rounding is especially important at high baud rates.
*/
- clk_divisor = (((4 * CFG_NS16550_CLK) /
- (MODE_X_DIV * gd->baudrate)) + 2) / 4;
-
- debug("NS16550 clock divisor = %d\n", clk_divisor);
-
- return clk_divisor;
+ return (CFG_NS16550_CLK + (gd->baudrate * (MODE_X_DIV / 2))) /
+ (MODE_X_DIV * gd->baudrate);
}
#if !defined(CONFIG_SERIAL_MULTI)