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Round the serial port clock divisor value returned by calc_divisor()

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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>
This commit is contained in:
Hugo Villeneuve 2008-07-08 14:54:58 -04:00 committed by Wolfgang Denk
parent 2b1fa9d383
commit 89134ea1f6
1 changed files with 6 additions and 1 deletions
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7
drivers/serial/serial.c
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@ -144,8 +144,13 @@ static int calc_divisor (NS16550_t port)
#else #else
#define MODE_X_DIV 16 #define MODE_X_DIV 16
#endif #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) #if !defined(CONFIG_SERIAL_MULTI)