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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>
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@ -144,8 +144,13 @@ static int calc_divisor (NS16550_t port)
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#else
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#define MODE_X_DIV 16
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#endif
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return (CFG_NS16550_CLK / MODE_X_DIV / gd->baudrate);
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/* Compute divisor value. Normally, we should simply return:
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* CFG_NS16550_CLK) / MODE_X_DIV / gd->baudrate
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* but we need to round that value by adding 0.5 or 8/16.
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* Rounding is especially important at high baud rates.
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*/
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return (((16 * CFG_NS16550_CLK) / MODE_X_DIV / gd->baudrate) + 8) / 16;
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}
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#if !defined(CONFIG_SERIAL_MULTI)
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