linux-kernel - RE: [PATCH 1/4] serial: xuartps: Fix termios issue for enabling odd parity

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Message-ID: <59506B47DEDD3943ABF9AC60020F4E2978D6E7EA@XAP-PVEXMBX02.xlnx.xilinx.com>
Date:	Mon, 17 Aug 2015 15:55:10 +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 1/4] serial: xuartps: Fix termios issue for enabling odd
 parity

Hi,

> -----Original Message-----
> From: Peter Hurley [mailto:peter@...leysoftware.com]
> Sent: Monday, August 17, 2015 9:09 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 1/4] serial: xuartps: Fix termios issue for enabling odd parity
>
> On 08/17/2015 03:22 AM, Michal Simek wrote:
> > From: Anirudha Sarangi <anirudha.sarangi@...inx.com>
> >
> > Existing set_termios does not handle the option for enabling odd
> > parity. This patch fixes it.
>
> NAK. PARODD does not enable parity generation or detection.
>
What if someone is trying to change from even to odd parity?
In this conditional case, we setup some register bit for the same.
Is the above use case not a valid one?

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 009e0dbc12d2..a3020344ac9d 100644
> > --- a/drivers/tty/serial/xilinx_uartps.c
> > +++ b/drivers/tty/serial/xilinx_uartps.c
> > @@ -723,7 +723,7 @@ static void cdns_uart_set_termios(struct uart_port
> *port,
> >     else
> >             cval |= CDNS_UART_MR_STOPMODE_1_BIT; /* 1 STOP bit */
> >
> > -   if (termios->c_cflag & PARENB) {
> > +   if ((termios->c_cflag & PARENB) || (termios->c_cflag & PARODD)) {
> >             /* Mark or Space parity */
> >             if (termios->c_cflag & CMSPAR) {
> >                     if (termios->c_cflag & PARODD)
> >



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