Re: [PATCH] use callbacks to access UART_DLL/UART_DLM

Måns Rullgård
2015-12-17T18:09:10Z

Sebastian Frias <sf84@laposte.net> writes:

>>> old_lcr = serial_in(p, UART_LCR);
>>> - serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A);
>>> -
>>> - old_dll = serial_in(p, UART_DLL);
>>> - old_dlm = serial_in(p, UART_DLM);
>>>
>>> - serial_out(p, UART_DLL, 0);
>>> - serial_out(p, UART_DLM, 0);
>>> + serial_out(p, UART_LCR, UART_LCR_CONF_MODE_A);
>>>
>>> - id = serial_in(p, UART_DLL) | serial_in(p, UART_DLM) << 8;
>>> + old_dl = serial_dl_read(p);
>>> + serial_dl_write(p, 0);
>>> + id = serial_dl_read(p);
>>> + serial_dl_write(p, old_dl);
>>>
>>> - serial_out(p, UART_DLL, old_dll);
>>> - serial_out(p, UART_DLM, old_dlm);
>>> serial_out(p, UART_LCR, old_lcr);
>>>
>>> return id;
>>> --
>>
>> If you left the blank lines alone, the patch would end up much easier to
>> understand. In this diff, some of the lines listed as added or removed
>> have actually not changed, and that's not immediately obvious.
>>
>
> The old code had some blank lines, which I suppose were there for clarity.
> I attempted to follow the same idea.
> But I don't mind changing the code as you wish.

It could well be that your patch results in a clearer final version, but
the diff is harder to parse when unchanged lines have moved around.

--
Måns Rullgård