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serial: Add define for max baud rate divisor

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

Signed-off-by: Ed Blake <ed.blake@sondrel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ed Blake 2017-09-26 11:40:02 +01:00 committed by Greg Kroah-Hartman
parent 7464779fa8
commit 6263368c5b
4 changed files with 5 additions and 4 deletions
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2
drivers/tty/serial/8250/8250_mtk.c
View File

@ -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) {

4
drivers/tty/serial/8250/8250_omap.c
View File

@ -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);

2
drivers/tty/serial/8250/8250_port.c
View File

@ -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);
}

1
include/uapi/linux/serial_reg.h
View File

@ -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)