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.
Regards,
Peter Hurley
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