diff options
| -rw-r--r-- | drivers/tty/serial/st-asc.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c index 4e9f4f29f3ce..8b2d7356611d 100644 --- a/drivers/tty/serial/st-asc.c +++ b/drivers/tty/serial/st-asc.c @@ -527,12 +527,12 @@ static void asc_set_termios(struct uart_port *port, struct ktermios *termios, * ASCBaudRate = ------------------------ * inputclock * - * However to keep the maths inside 32bits we divide top and - * bottom by 64. The +1 is to avoid a divide by zero if the - * input clock rate is something unexpected. + * To keep maths inside 64bits, we divide inputclock by 16. */ - u32 counter = (baud * 16384) / ((port->uartclk / 64) + 1); - asc_out(port, ASC_BAUDRATE, counter); + u64 dividend = (u64)baud * (1 << 16); + + do_div(dividend, port->uartclk / 16); + asc_out(port, ASC_BAUDRATE, dividend); ctrl_val |= ASC_CTL_BAUDMODE; } |