From 89134ea1f67208fd3160bdbb0b9eaab4eab98484 Mon Sep 17 00:00:00 2001 From: Hugo Villeneuve Date: Tue, 8 Jul 2008 14:54:58 -0400 Subject: [PATCH] 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 Signed-off-by: John Roberts --- drivers/serial/serial.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c index 76425d8790..182ca2d149 100644 --- a/drivers/serial/serial.c +++ b/drivers/serial/serial.c @@ -144,8 +144,13 @@ static int calc_divisor (NS16550_t port) #else #define MODE_X_DIV 16 #endif - return (CFG_NS16550_CLK / MODE_X_DIV / gd->baudrate); + /* 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 or 8/16. + * Rounding is especially important at high baud rates. + */ + return (((16 * CFG_NS16550_CLK) / MODE_X_DIV / gd->baudrate) + 8) / 16; } #if !defined(CONFIG_SERIAL_MULTI)