Subject: [PATCH 2/4] serial: xuartps: Do not handle overrun errors under IGNPAR option

From: [email-masked] (Peter Hurley)
Date: Mon, 17 Aug 2015 12:19:30 -0400

On 08/17/2015 11:58 AM, Anirudha Sarangi wrote:
> Hi,
> 
>> -----Original Message-----
>> From: Peter Hurley [mailto:peter at hurleysoftware.com]
>> Sent: Monday, August 17, 2015 9:20 PM
>> To: Michal Simek
>> Cc: linux-kernel at vger.kernel.org; monstr at monstr.eu; Anirudha Sarangi; Soren
>> Brinkmann; Jiri Slaby; linux-serial at vger.kernel.org; Greg Kroah-Hartman; linux-
>> arm-kernel at lists.infradead.org
>> Subject: Re: [PATCH 2/4] serial: xuartps: Do not handle overrun errors under
>> IGNPAR option
>>
>> On 08/17/2015 03:22 AM, Michal Simek wrote:
>>> From: Anirudha Sarangi <[email-masked]>
>>>
>>> The existing implementation includes overrun errors under IGNPAR
>>> option. This patch fixes it by including only parity and framing error
>>> under IGNPAR option.
>>
>> The convention adopted by Linux serial drivers is to ignore overrun errors if both
>> IGNPAR and IGNBRK are set.
>>
> I just followed the set_termios documentation, which says that IGNPAR is for parity and framing.
> The current controller does not support break detection reliably.
> That is probably why we don?t have IGNBRK.

My point is about how a user-space process tells the serial driver to ignore
overrun errors, as well, and not specifically about break handling.

> 
> Regards
> Anirudha
> 
>> Regards,
>> Peter Hurley
>>
>>> Signed-off-by: Anirudha Sarangi <[email-masked]>
>>> Signed-off-by: Michal Simek <[email-masked]>
>>> ---
>>>
>>>  drivers/tty/serial/xilinx_uartps.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/tty/serial/xilinx_uartps.c
>>> b/drivers/tty/serial/xilinx_uartps.c
>>> index a3020344ac9d..c4437e8929ff 100644
>>> --- a/drivers/tty/serial/xilinx_uartps.c
>>> +++ b/drivers/tty/serial/xilinx_uartps.c
>>> @@ -691,7 +691,7 @@ static void cdns_uart_set_termios(struct uart_port
>>> *port,
>>>
>>>     if (termios->c_iflag & IGNPAR)
>>>             port->ignore_status_mask |= CDNS_UART_IXR_PARITY |
>>> -                   CDNS_UART_IXR_FRAMING |
>> CDNS_UART_IXR_OVERRUN;
>>> +                                       CDNS_UART_IXR_FRAMING;
>>>
>>>     /* ignore all characters if CREAD is not set */
>>>     if ((termios->c_cflag & CREAD) == 0)
>>>
> 
> 
> 
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