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serial: 8250_dw: allow lower reference frequencies

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We have couple of standard but rare used baudrates which are not supported by
1,8432MHz reference frequency. Besides that user can potentially ask for any
baudrate (via BOTHER flag) and we currently don't fully support that. Since
clk-fractional-divider is moved to use rational best approximation for
reference frequency we may amend the driver to support whatever user wants.

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Andy Shevchenko 2015-09-22 18:54:12 +03:00 committed by Stephen Boyd
parent 0777591e71
commit 3b4261dcf6
1 changed files with 0 additions and 4 deletions
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4
drivers/tty/serial/8250/8250_dw.c
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@ -224,10 +224,6 @@ static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
if (IS_ERR(d->clk) || !old)
goto out;
/* Not requesting clock rates below 1.8432Mhz */
if (baud < 115200)
baud = 115200;
clk_disable_unprepare(d->clk);
rate = clk_round_rate(d->clk, baud * 16);
ret = clk_set_rate(d->clk, rate);