linux-kernel - RE: [PATCH] tty: serial: fsl_lpuart: use UARTMODIR register bits for lpuart32 platform

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Date:   Fri, 14 Apr 2023 01:59:51 +0000
From:   Sherry Sun <sherry.sun@....com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        "philippe.schenker@...adex.com" <philippe.schenker@...adex.com>,
        linux-serial <linux-serial@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH] tty: serial: fsl_lpuart: use UARTMODIR register bits for
 lpuart32 platform



> -----Original Message-----
> From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Sent: 2023年4月13日 16:56
> To: Sherry Sun <sherry.sun@....com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>; Jiri Slaby
> <jirislaby@...nel.org>; philippe.schenker@...adex.com; linux-serial <linux-
> serial@...r.kernel.org>; LKML <linux-kernel@...r.kernel.org>; dl-linux-imx
> <linux-imx@....com>
> Subject: Re: [PATCH] tty: serial: fsl_lpuart: use UARTMODIR register bits for
> lpuart32 platform
> 
> On Thu, 13 Apr 2023, Sherry Sun wrote:
> 
> > For lpuart32 platforms, UARTMODIR register is used instead of
> UARTMODEM.
> > So here should configure the corresponding UARTMODIR register bits.
> >
> > Fixes: 67b01837861c ("tty: serial: lpuart: Add RS485 support for
> > 32-bit uart flavour")
> 
> The patch is good but I don't think Fixes tag is warranted here because
> TXRTSPOL and TXRTSE bits are the same for both registers. ...So this is mostly
> to avoid reader confusion rather than fix an actual problem.
> 
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

Sure, will remove the fix tag, thanks.

Best Regards
Sherry

> 
> --
>  i.
> 
> > Signed-off-by: Sherry Sun <sherry.sun@....com>
> > ---
> >  drivers/tty/serial/fsl_lpuart.c | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/tty/serial/fsl_lpuart.c
> > b/drivers/tty/serial/fsl_lpuart.c index 074bfed57fc9..9845d3f5b84b
> > 100644
> > --- a/drivers/tty/serial/fsl_lpuart.c
> > +++ b/drivers/tty/serial/fsl_lpuart.c
> > @@ -1406,12 +1406,12 @@ static int lpuart32_config_rs485(struct
> uart_port *port, struct ktermios *termio
> >  			struct lpuart_port, port);
> >
> >  	unsigned long modem = lpuart32_read(&sport->port, UARTMODIR)
> > -				& ~(UARTMODEM_TXRTSPOL |
> UARTMODEM_TXRTSE);
> > +				& ~(UARTMODIR_TXRTSPOL |
> UARTMODIR_TXRTSE);
> >  	lpuart32_write(&sport->port, modem, UARTMODIR);
> >
> >  	if (rs485->flags & SER_RS485_ENABLED) {
> >  		/* Enable auto RS-485 RTS mode */
> > -		modem |= UARTMODEM_TXRTSE;
> > +		modem |= UARTMODIR_TXRTSE;
> >
> >  		/*
> >  		 * The hardware defaults to RTS logic HIGH while transfer.
> > @@ -1420,9 +1420,9 @@ static int lpuart32_config_rs485(struct uart_port
> *port, struct ktermios *termio
> >  		 * Note: UART is assumed to be active high.
> >  		 */
> >  		if (rs485->flags & SER_RS485_RTS_ON_SEND)
> > -			modem |= UARTMODEM_TXRTSPOL;
> > +			modem |= UARTMODIR_TXRTSPOL;
> >  		else if (rs485->flags & SER_RS485_RTS_AFTER_SEND)
> > -			modem &= ~UARTMODEM_TXRTSPOL;
> > +			modem &= ~UARTMODIR_TXRTSPOL;
> >  	}
> >
> >  	lpuart32_write(&sport->port, modem, UARTMODIR);
> >