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path: root/drivers/tty/serial/omap-serial.c
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Diffstat (limited to 'drivers/tty/serial/omap-serial.c')
-rw-r--r--drivers/tty/serial/omap-serial.c34
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);
}
/*