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

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Message-ID: <59506B47DEDD3943ABF9AC60020F4E2978D6EDC0@XAP-PVEXMBX02.xlnx.xilinx.com>
Date:	Mon, 17 Aug 2015 18:07:00 +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 9:50 PM
> To: Anirudha Sarangi; Michal Simek
> Cc: linux-kernel@...r.kernel.org; monstr@...str.eu; 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 11:58 AM, Anirudha Sarangi wrote:
> > 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.
>
> 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.
>
I understand and this particular change is not very important in the patch set.
I can happily remove it.

Regards
Anirudha
> >
> > 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)
> >>>
> >
> >
> >
> > This email and any attachments are intended for the sole use of the named
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> Delete this email message and any attachments immediately.
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