X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=drivers%2Fserial%2Fserial.c;h=8bbfcf9c0cba8a7115d1c3b5b680791d1e2e36f6;hb=81091f58f0c58ecd26c5b05de2ae20ca6cdb521c;hp=76425d87901ff13930b02183e9347349e0aa8c0e;hpb=f743931f9b4d4e15c9bdfe726bef033ea1f1402c;p=oweals%2Fu-boot.git

diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index 76425d8790..8bbfcf9c0c 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -144,8 +144,14 @@ 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.
+	 * Rounding is especially important at high baud rates.
+	 */
+	return (CFG_NS16550_CLK + (gd->baudrate * (MODE_X_DIV / 2))) /
+		(MODE_X_DIV * gd->baudrate);
 }
 
 #if !defined(CONFIG_SERIAL_MULTI)