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Commit 81bb549f authored by Eddie Huang's avatar Eddie Huang Committed by Greg Kroah-Hartman
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serial: 8250_mtk: support big baud rate. 



mediatek can support baud rate up to 4M.
the 'uart_get_baud_rate' function will limit the max baud rate.
Modify max baud to remove the limit.

Signed-off-by: default avatarLong Cheng <long.cheng@mediatek.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 490d5ce2

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

+1 −5
Original line number Diff line number Diff line
@@ -62,7 +62,7 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, 
	 */

	baud = uart_get_baud_rate(port, termios, old,

				  port->uartclk / 16 / 0xffff,

				  port->uartclk / 16);

				  port->uartclk);



	if (baud <= 115200) {

		serial_port_out(port, UART_MTK_HIGHS, 0x0);
@@ -76,10 +76,6 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, 
		quot = DIV_ROUND_UP(port->uartclk, 4 * baud);

	} else {

		serial_port_out(port, UART_MTK_HIGHS, 0x3);



		/* Set to highest baudrate supported */

		if (baud >= 1152000)

			baud = 921600;

		quot = DIV_ROUND_UP(port->uartclk, 256 * baud);

	}

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

+1 −3
Original line number Diff line number Diff line
@@ -2504,8 +2504,6 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port, 
					     struct ktermios *termios,

					     struct ktermios *old)

{

	unsigned int tolerance = port->uartclk / 100;



	/*

	 * Ask the core to calculate the divisor for us.

	 * Allow 1% tolerance at the upper limit so uart clks marginally
@@ -2514,7 +2512,7 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port, 
	 */

	return uart_get_baud_rate(port, termios, old,

				  port->uartclk / 16 / 0xffff,

				  (port->uartclk + tolerance) / 16);

				  port->uartclk);

}



void