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tty: omap-serial: pull out calculation from baud_is_mode16 

To determine the correct divisor, we need to know the difference between
the desired baud rate and the actual baud rate. The calculation for this
difference is implemented twice within omap_serial_baud_is_mode16().
Pull out the calculation for easier maintenance.

While at it, remove the CamelCasing from the variable names.

Signed-off-by: Frans Klaver <frans.klaver@xsens.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Frans Klaver 2014-09-24 09:55:22 +02:00 committed by Greg Kroah-Hartman
parent dc3187564e
commit 13d6ceb4c4
1 changed files with 23 additions and 17 deletions
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40
drivers/tty/serial/omap-serial.c
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@ -238,6 +238,26 @@ static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
pdata->enable_wakeup(up->dev, 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
@ -252,24 +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;
int baudAbsDiff16;
int abs_diff_13 = calculate_baud_abs_diff(port, baud, 13);
int abs_diff_16 = calculate_baud_abs_diff(port, baud, 16);
if (n13 == 0)
n13 = 1;
if (n16 == 0)
n16 = 1;
baudAbsDiff13 = baud - (port->uartclk / (13 * n13));
baudAbsDiff16 = baud - (port->uartclk / (16 * n16));
if (baudAbsDiff13 < 0)
baudAbsDiff13 = -baudAbsDiff13;
if (baudAbsDiff16 < 0)
baudAbsDiff16 = -baudAbsDiff16;
return (baudAbsDiff13 >= baudAbsDiff16);
return (abs_diff_13 >= abs_diff_16);
}
/*