From 81bb549fdf144582f57d1df65a2517beb418dc8b Mon Sep 17 00:00:00 2001 From: Eddie Huang Date: Fri, 12 Aug 2016 10:41:11 +0800 Subject: [PATCH] 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: Long Cheng Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_mtk.c | 6 +----- drivers/tty/serial/8250/8250_port.c | 4 +--- 2 files changed, 2 insertions(+), 8 deletions(-) diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index 3611ec9bb4fa..ce0cc471bfc3 100644 --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -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); } diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 7481b95c6d84..c45c1e3f3631 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -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