On Fri, 2016-08-12 at 10:41 +0800, Long Cheng wrote:
> From: Eddie Huang <eddie.huang@xxxxxxxxxxxx>
>
> 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 <long.cheng@xxxxxxxxxxxx>
> ---
> 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 3611ec9..ce0cc47 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 7481b95..c45c1e3 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
Ping? Any reaction to the above?
Regards, thanks.
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