Round the serial port clock divisor value returned by calc_divisor().
Signed-off-by: Hugo Villeneuve hugo.villeneuve@lyrtech.com
---
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)