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

From: Anirudha Sarangi
Date: Mon Aug 17 2015 - 12:32:51 EST


Hi,

> -----Original Message-----
> From: Peter Hurley [mailto:peter@xxxxxxxxxxxxxxxxxx]
> Sent: Monday, August 17, 2015 9:20 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 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@xxxxxxxxxx>
> >
> > 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 donât have IGNBRK.

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 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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