2015-03-19 15:58 GMT+01:00 Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>:
> On 03/19/2015 09:55 AM, Maxime Coquelin wrote:
>>>>>> +static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
>>>>>> + struct ktermios *old)
> [...]
>>>>>> + usardiv = (port->uartclk * 25) / (baud * 4);
>>>>>> + mantissa = (usardiv / 100) << USART_BRR_DIV_M_SHIFT;
>>>>>> + fraction = DIV_ROUND_CLOSEST((usardiv % 100) * 16, 100);
>>>>>> + if (fraction & ~USART_BRR_DIV_F_MASK) {
>>>>>> + fraction = 0;
>>>>>> + mantissa += (1 << USART_BRR_DIV_M_SHIFT);
>>>>>> + }
> [...]
>> Really, I would prefer keeping this fractional divider as it is
>> implemented today.
>
> You have to admit that's basically an unintelligible mess;
> how would anyone ever be able to refactor and replace that with a
> common divider implementation?
>
> At the very least, please comment on the formula and format.
Ok, I will refactor the implementation, and comment it.
Regards,
Maxime
>
> Regards,
> Peter Hurley
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