From: Anirudha Sarangi <anirudha.sarangi@xilinx.com>
To: Peter Hurley <peter@hurleysoftware.com>, Michal Simek <michals@xilinx.com>
CC: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "monstr@monstr.eu" <monstr@monstr.eu>,
        Soren Brinkmann <sorenb@xilinx.com>, Jiri Slaby <jslaby@suse.com>,
        "linux-serial@vger.kernel.org" <linux-serial@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Subject: RE: [PATCH 2/4] serial: xuartps: Do not handle overrun errors under
 IGNPAR option
Thread-Topic: [PATCH 2/4] serial: xuartps: Do not handle overrun errors
 under IGNPAR option
Thread-Index: AQHQ2L2J45D/v+JcWUaozwzE2uhvpZ4P0ROAgACIKQA=
Date: Mon, 17 Aug 2015 15:58:36 +0000
Message-ID: <59506B47DEDD3943ABF9AC60020F4E2978D6E7FF@XAP-PVEXMBX02.xlnx.xilinx.com>
References: <5b154ba97bcd79e49e2131152eb2fc1761594a6c.1439796149.git.michal.simek@xilinx.com>
 <41df6eb35d69801afa5b686a6974e3c3bf65178a.1439796149.git.michal.simek@xilinx.com>
 <55D20297.6010500@hurleysoftware.com>
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Hi,

> -----Original Message-----
> From: Peter Hurley [mailto:peter@hurleysoftware.com]
> Sent: Monday, August 17, 2015 9:20 PM
> To: Michal Simek
> Cc: linux-kernel@vger.kernel.org; monstr@monstr.eu; Anirudha Sarangi; Soren
> Brinkmann; Jiri Slaby; linux-serial@vger.kernel.org; Greg Kroah-Hartman; linux-
> arm-kernel@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 <anirudha.sarangi@xilinx.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@xilinx.com>
> > Signed-off-by: Michal Simek <michal.simek@xilinx.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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