[PATCH] serial: zynq: Use DIV_ROUND_CLOSEST() to calcurate divider value

[Michal Simek]

On 7/13/22 03:38, Kunihiko Hayashi wrote:
> Since the calulation of "bgen" is rounded down, using a higher
> baudrate will result in a larger difference from the actual
> baudrate. Should use DIV_ROUND_CLOSEST() like the Linux driver.
> 
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko at socionext.com>
> ---
>   drivers/serial/serial_zynq.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/serial/serial_zynq.c b/drivers/serial/serial_zynq.c
> index 83adfb5fb98a..857c570c5836 100644
> --- a/drivers/serial/serial_zynq.c
> +++ b/drivers/serial/serial_zynq.c
> @@ -75,7 +75,7 @@ static void _uart_zynq_serial_setbrg(struct uart_zynq *regs,
>   	 * Find acceptable values for baud generation.
>   	 */
>   	for (bdiv = 4; bdiv < 255; bdiv++) {
> -		bgen = clock / (baud * (bdiv + 1));
> +		bgen = DIV_ROUND_CLOSEST(clock, (baud * (bdiv + 1)));

Applied but I have removed one level of () in second parameter which is not needed.

Thanks,
Michal