linux-kernel - RE: [PATCH] tty: serial: lpuart: disable flow control when wait transmit engine complete

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Date:   Thu, 4 Aug 2022 06:33:40 +0000
From:   Sherry Sun <sherry.sun@....com>
To:     Jiri Slaby <jirislaby@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "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] tty: serial: lpuart: disable flow control when wait
 transmit engine complete


> On 03. 08. 22, 3:55, Sherry Sun wrote:
> > When TX fifo has dirty data, user initialize the port and wait
> > transmit engine complete, it should disable the flow control,
> > otherwise tx fifo never be empty.
> 
> Sorry I cannot parse the above. Care to rephrase? (And maybe spellcheck?)

Hi Jiri, sure, maybe some grammatical errors in the commit log, I can send V2 for your check. Thanks!

Best regards
Sherry
> 
> > Signed-off-by: Sherry Sun <sherry.sun@....com>
> > ---
> >   drivers/tty/serial/fsl_lpuart.c | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/tty/serial/fsl_lpuart.c
> > b/drivers/tty/serial/fsl_lpuart.c index fc7d235a1e27..f0fccd2ff7ac
> > 100644
> > --- a/drivers/tty/serial/fsl_lpuart.c
> > +++ b/drivers/tty/serial/fsl_lpuart.c
> > @@ -2172,6 +2172,7 @@ lpuart32_set_termios(struct uart_port *port,
> struct ktermios *termios,
> >   	uart_update_timeout(port, termios->c_cflag, baud);
> >
> >   	/* wait transmit engin complete */
> > +	lpuart32_write(&sport->port, 0, UARTMODIR);
> >   	lpuart32_wait_bit_set(&sport->port, UARTSTAT, UARTSTAT_TC);
> >
> >   	/* disable transmit and receive */
> 
> thanks,
> --
> js
> suse labs