diff options
Diffstat (limited to 'drivers/tty/serial/omap-serial.c')
| -rw-r--r-- | drivers/tty/serial/omap-serial.c | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index d017cec8a34a..18c30cabe27f 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -239,6 +239,26 @@ static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable) } /* + * Calculate the absolute difference between the desired and actual baud + * rate for the given mode. + */ +static inline int calculate_baud_abs_diff(struct uart_port *port, + unsigned int baud, unsigned int mode) +{ + unsigned int n = port->uartclk / (mode * baud); + int abs_diff; + + if (n == 0) + n = 1; + + abs_diff = baud - (port->uartclk / (mode * n)); + if (abs_diff < 0) + abs_diff = -abs_diff; + + return abs_diff; +} + +/* * serial_omap_baud_is_mode16 - check if baud rate is MODE16X * @port: uart port info * @baud: baudrate for which mode needs to be determined @@ -252,16 +272,10 @@ static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable) static bool serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud) { - unsigned int n13 = port->uartclk / (13 * baud); - unsigned int n16 = port->uartclk / (16 * baud); - int baudAbsDiff13 = baud - (port->uartclk / (13 * n13)); - int baudAbsDiff16 = baud - (port->uartclk / (16 * n16)); - if (baudAbsDiff13 < 0) - baudAbsDiff13 = -baudAbsDiff13; - if (baudAbsDiff16 < 0) - baudAbsDiff16 = -baudAbsDiff16; - - return (baudAbsDiff13 >= baudAbsDiff16); + int abs_diff_13 = calculate_baud_abs_diff(port, baud, 13); + int abs_diff_16 = calculate_baud_abs_diff(port, baud, 16); + + return (abs_diff_13 >= abs_diff_16); } /* |