linux-kernel - RE: [PATCH 1/2] tty: serial: fsl_lpuart: correct the count of break characters

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Date:   Fri, 15 Jul 2022 07:22:18 +0000
From:   Sherry Sun <sherry.sun@....com>
To:     Michael Walle <michael@...le.cc>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "jirislaby@...nel.org" <jirislaby@...nel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH 1/2] tty: serial: fsl_lpuart: correct the count of break
 characters



> Subject: Re: [PATCH 1/2] tty: serial: fsl_lpuart: correct the count of break
> characters
> 
> Am 2022-07-15 04:59, schrieb Sherry Sun:
> > The LPUART can't distinguish between a break signal and a framing
> > error, so need to count the break characters if there is a framing
> > error and received data is zero instead of the parity error.
> 
> Ah, it seems I mixed up the framing and the partiy error. Did you test the
> break in the receive path, though?
> 

Hi Michael, yes, I have tested this, with this fix patch, the sport->port.icount.brk is correctly now.

Best regards
Sherry

> -michael
> 
> >
> > Fixes: 5541a9bacfe5 ("serial: fsl_lpuart: handle break and make sysrq
> > work")
> > Signed-off-by: Sherry Sun <sherry.sun@....com>
> > ---
> >  drivers/tty/serial/fsl_lpuart.c | 12 ++++++------
> >  1 file changed, 6 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/tty/serial/fsl_lpuart.c
> > b/drivers/tty/serial/fsl_lpuart.c index fc7d235a1e27..b6365566a460
> > 100644
> > --- a/drivers/tty/serial/fsl_lpuart.c
> > +++ b/drivers/tty/serial/fsl_lpuart.c
> > @@ -990,12 +990,12 @@ static void lpuart32_rxint(struct lpuart_port
> > *sport)
> >
> >  		if (sr & (UARTSTAT_PE | UARTSTAT_OR | UARTSTAT_FE)) {
> >  			if (sr & UARTSTAT_PE) {
> > +				sport->port.icount.parity++;
> > +			} else if (sr & UARTSTAT_FE) {
> >  				if (is_break)
> >  					sport->port.icount.brk++;
> >  				else
> > -					sport->port.icount.parity++;
> > -			} else if (sr & UARTSTAT_FE) {
> > -				sport->port.icount.frame++;
> > +					sport->port.icount.frame++;
> >  			}
> >
> >  			if (sr & UARTSTAT_OR)
> > @@ -1010,12 +1010,12 @@ static void lpuart32_rxint(struct lpuart_port
> > *sport)
> >  			sr &= sport->port.read_status_mask;
> >
> >  			if (sr & UARTSTAT_PE) {
> > +				flg = TTY_PARITY;
> > +			} else if (sr & UARTSTAT_FE) {
> >  				if (is_break)
> >  					flg = TTY_BREAK;
> >  				else
> > -					flg = TTY_PARITY;
> > -			} else if (sr & UARTSTAT_FE) {
> > -				flg = TTY_FRAME;
> > +					flg = TTY_FRAME;
> >  			}
> >
> >  			if (sr & UARTSTAT_OR)
> 
> --
> -michael