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serial: 8250_dw: Pass the same rate to the clk round and set rate methods 

Indeed according to the clk API if clk_round_rate() has successfully
accepted a rate, then in order setup the clock with value returned by the
clk_round_rate() the clk_set_rate() method must be called with the
original rate value.

Suggested-by: Russell King <linux@armlinux.org.uk>
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>

Link: https://lore.kernel.org/r/20200723003357.26897-4-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Serge Semin 2020-07-23 03:33:56 +03:00 committed by Greg Kroah-Hartman
parent 442fdef1b9
commit 0be160cf86
1 changed files with 3 additions and 3 deletions
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6
drivers/tty/serial/8250/8250_dw.c
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@ -275,15 +275,15 @@ dw8250_do_pm(struct uart_port *port, unsigned int state, unsigned int old)
static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
struct ktermios *old)
{
unsigned int baud = tty_termios_baud_rate(termios);
unsigned long newrate = tty_termios_baud_rate(termios) * 16;
struct dw8250_data *d = to_dw8250_data(p->private_data);
long rate;
int ret;
clk_disable_unprepare(d->clk);
rate = clk_round_rate(d->clk, baud * 16);
rate = clk_round_rate(d->clk, newrate);
if (rate > 0) {
ret = clk_set_rate(d->clk, rate);
ret = clk_set_rate(d->clk, newrate);
if (!ret)
p->uartclk = rate;
}