linux-kernel - RE: [PATCH 2/4] serial: xuartps: Do not handle overrun errors under IGNPAR option

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Message-ID: <59506B47DEDD3943ABF9AC60020F4E2978D6E7FF@XAP-PVEXMBX02.xlnx.xilinx.com>
Date:	Mon, 17 Aug 2015 15:58:36 +0000
From:	Anirudha Sarangi <anirudha.sarangi@...inx.com>
To:	Peter Hurley <peter@...leysoftware.com>,
	Michal Simek <michals@...inx.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"monstr@...str.eu" <monstr@...str.eu>,
	Soren Brinkmann <sorenb@...inx.com>,
	Jiri Slaby <jslaby@...e.com>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 2/4] serial: xuartps: Do not handle overrun errors under
 IGNPAR option

Hi,

> -----Original Message-----
> From: Peter Hurley [mailto:peter@...leysoftware.com]
> Sent: Monday, August 17, 2015 9:20 PM
> To: Michal Simek
> Cc: linux-kernel@...r.kernel.org; monstr@...str.eu; Anirudha Sarangi; Soren
> Brinkmann; Jiri Slaby; linux-serial@...r.kernel.org; Greg Kroah-Hartman; linux-
> arm-kernel@...ts.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 <anirudha.sarangi@...inx.com>
> >
> > 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.

Regards
Anirudha

> Regards,
> Peter Hurley
>
> > Signed-off-by: Anirudha Sarangi <anirudh@...inx.com>
> > Signed-off-by: Michal Simek <michal.simek@...inx.com>
> > ---
> >
> >  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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