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| author | Hugo Villeneuve <hugo.villeneuve@lyrtech.com> | 2008-07-08 14:54:58 -0400 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2008-07-10 00:48:31 +0200 |
| commit | 89134ea1f67208fd3160bdbb0b9eaab4eab98484 (patch) | |
| tree | c4366e03007cb41a64f62e709a4d7511adaae082 /drivers/serial/serial.c | |
| parent | 2b1fa9d383cbbb7d347c1583bd6ca4e181ba8e9e (diff) | |
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>
Signed-off-by: John Roberts <john.roberts@pwav.com>
Diffstat (limited to 'drivers/serial/serial.c')
| -rw-r--r-- | 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 76425d87901..182ca2d149e 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) |