Round the serial port clock divisor value returned by
calc_divisor().
Signed-off-by: Hugo Villeneuve <[EMAIL PROTECTED]>
---
Rounding is important, especially when using high baud rates
values like 115200bps. When using the non-rounded value, some
boards will work and some won't.
drivers/serial/serial.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index 76425d8..7e315ad 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -124,6 +124,8 @@ static NS16550_t serial_ports[4] = {
static int calc_divisor (NS16550_t port)
{
+ u32 divisor_x10;
+
#ifdef CONFIG_OMAP1510
/* If can't cleanly clock 115200 set div to 1 */
if ((CFG_NS16550_CLK == 12000000) && (gd->baudrate == 115200)) {
@@ -144,8 +146,11 @@ 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 with rounding by adding 0.5 */
+ divisor_x10 = (10 * CFG_NS16550_CLK) / MODE_X_DIV / gd->baudrate;
+
+ return (divisor_x10 + 5) / 10;
}
#if !defined(CONFIG_SERIAL_MULTI)
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