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serial: sh-sci: Fix range check of bit-rate for HSCIF 

If bit-rate calculation result of HSCIF is expect 255 from 0,
driver does not calculate error bit. However, we need to round
the value to calculate error bit in the case of negative value.
This rounds the value of bit-rate using clamp(), and bit-rate is the
case of negative value, it enables the calculation of the error bit.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Nobuhiro Iwamatsu 2014-07-14 16:09:59 +09:00 committed by Greg Kroah-Hartman
parent b7d66397f4
commit bcb9973a60
1 changed files with 1 additions and 2 deletions
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3
drivers/tty/serial/sh-sci.c
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@ -1791,8 +1791,7 @@ static void sci_baud_calc_hscif(unsigned int bps, unsigned long freq,
/* integerized formulas from HSCIF documentation */
br = DIV_ROUND_CLOSEST(freq, (sr *
(1 << (2 * c + 1)) * bps)) - 1;
if (br < 0 || br > 255)
continue;
br = clamp(br, 0, 255);
err = DIV_ROUND_CLOSEST(freq, ((br + 1) * bps * sr *
(1 << (2 * c + 1)) / 1000)) -
1000;