Re: [PATCH 9/9 -v2] imx: serial: use tty_encode_baud_rate to settrue rate

[Sascha Hauer]

Hi,

On Wed, Jun 10, 2009 at 02:08:36PM +0200, Oskar Schirmer wrote:
> real baud rate may be different from the one requested.
> for upper layers, set the nearest value to the real rate
> in favour of the rate previously requested.
> 
> Signed-off-by: Oskar Schirmer <os@xxxxxxxxx>
> ---
>  drivers/serial/imx.c |    7 +++++++
>  1 files changed, 7 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c
> index 1c00e2a..c367160 100644
> --- a/drivers/serial/imx.c
> +++ b/drivers/serial/imx.c
> @@ -818,6 +818,7 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
>  	unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
>  	unsigned int div, ufcr;
>  	unsigned long num, denom;
> +	uint64_t tdiv64;
>  
>  	/*
>  	 * If we don't support modem control lines, don't allow
> @@ -930,6 +931,12 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
>  	rational_best_approximation(16 * div * baud, sport->port.uartclk,
>  		1 << 16, 1 << 16, &num, &denom);
>  
> +	tdiv64 = sport->port.uartclk;
> +	tdiv64 *= num;
> +	do_div(tdiv64, denom * 16 * div);
> +	tty_encode_baud_rate(sport->port.info->port.tty,
> +		(speed_t)tdiv64, (speed_t)tdiv64);
> +
>  	num -= 1;
>  	denom -= 1;
>  

This patch breaks booting with a serial console on i.MX UARTs. The
following patch fixes this. Alan, please consider applying it.

Sascha