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

[Anirudha Sarangi]

Hi,

> -----Original Message-----
> From: Peter Hurley [mailto:peter@xxxxxxxxxxxxxxxxxx]
> Sent: Monday, August 17, 2015 9:54 PM
> To: Anirudha Sarangi; Michal Simek
> Cc: linux-kernel@xxxxxxxxxxxxxxx; monstr@xxxxxxxxx; Soren Brinkmann; Jiri
> Slaby; linux-serial@xxxxxxxxxxxxxxx; Greg Kroah-Hartman; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH 1/4] serial: xuartps: Fix termios issue for enabling odd parity
>
> On 08/17/2015 11:55 AM, Anirudha Sarangi wrote:
> > Hi,
> >
> >> -----Original Message-----
> >> From: Peter Hurley [mailto:peter@xxxxxxxxxxxxxxxxxx]
> >> Sent: Monday, August 17, 2015 9:09 PM
> >> To: Michal Simek
> >> Cc: linux-kernel@xxxxxxxxxxxxxxx; monstr@xxxxxxxxx; Anirudha Sarangi;
> >> Soren Brinkmann; Jiri Slaby; linux-serial@xxxxxxxxxxxxxxx; Greg
> >> Kroah-Hartman; linux- arm-kernel@xxxxxxxxxxxxxxxxxxx
> >> 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@xxxxxxxxxx>
> >>>
> >>> 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?
>
> If userspace wants odd parity, then c_cflag must have both PARENB and PARODD
> set.
>
> Just PARODD does nothing.
>
> From SUS v4, General Terminal Interface, 11.2.4 Control Modes;
>
> "If PARENB is set, parity generation and detection shall be enabled and a parity
> bit is added to each byte. If parity is enabled, PARODD shall specify odd parity if
> set; otherwise, even parity shall be used."
>
>
Thanks a lot. I will incorporate the changes.
>
> > 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@xxxxxxxxxx>
> >>> Signed-off-by: Michal Simek <michal.simek@xxxxxxxxxx>
> >>> ---
> >>>
> >>>  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)
> >>>
> >
> >
> >
> > This email and any attachments are intended for the sole use of the named
> recipient(s) and contain(s) confidential information that may be proprietary,
> privileged or copyrighted under applicable law. If you are not the intended
> recipient, do not read, copy, or forward this email message or any attachments.
> Delete this email message and any attachments immediately.
> >



This email and any attachments are intended for the sole use of the named recipient(s) and contain(s) confidential information that may be proprietary, privileged or copyrighted under applicable law. If you are not the intended recipient, do not read, copy, or forward this email message or any attachments. Delete this email message and any attachments immediately.