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Commit 6263368c authored by Ed Blake's avatar Ed Blake Committed by Greg Kroah-Hartman
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serial: Add define for max baud rate divisor 



Add a define for the maximum baud rate divisor, to improve code
readability.

Signed-off-by: default avatarEd Blake <ed.blake@sondrel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7464779f

drivers/tty/serial/8250/8250_mtk.c

+1 −1
Original line number Diff line number Diff line
@@ -61,7 +61,7 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, 
	 * registers to their default values.

	 */

	baud = uart_get_baud_rate(port, termios, old,

				  port->uartclk / 16 / 0xffff,

				  port->uartclk / 16 / UART_DIV_MAX,

				  port->uartclk);



	if (baud <= 115200) {

drivers/tty/serial/8250/8250_omap.c

+2 −2
Original line number Diff line number Diff line
@@ -199,7 +199,7 @@ static void omap_8250_get_divisor(struct uart_port *port, unsigned int baud, 
	 * Old custom speed handling.

	 */

	if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) {

		priv->quot = port->custom_divisor & 0xffff;

		priv->quot = port->custom_divisor & UART_DIV_MAX;

		/*

		 * I assume that nobody is using this. But hey, if somebody

		 * would like to specify the divisor _and_ the mode then the
@@ -358,7 +358,7 @@ static void omap_8250_set_termios(struct uart_port *port, 
	 * Ask the core to calculate the divisor for us.

	 */

	baud = uart_get_baud_rate(port, termios, old,

				  port->uartclk / 16 / 0xffff,

				  port->uartclk / 16 / UART_DIV_MAX,

				  port->uartclk / 13);

	omap_8250_get_divisor(port, baud, priv);

drivers/tty/serial/8250/8250_port.c

+1 −1
Original line number Diff line number Diff line
@@ -2601,7 +2601,7 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port, 
	 * causing transmission errors.

	 */

	return uart_get_baud_rate(port, termios, old,

				  port->uartclk / 16 / 0xffff,

				  port->uartclk / 16 / UART_DIV_MAX,

				  port->uartclk);

}

include/uapi/linux/serial_reg.h

+1 −0
Original line number Diff line number Diff line
@@ -157,6 +157,7 @@ 
 */

#define UART_DLL	0	/* Out: Divisor Latch Low */

#define UART_DLM	1	/* Out: Divisor Latch High */

#define UART_DIV_MAX	0xFFFF	/* Max divisor value */



/*

 * LCR=0xBF (or DLAB=1 for 16C660)