linux-kernel - Re: [PATCH v4 09/10] tty: serial: use uart_port

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Date:   Tue, 20 Sep 2022 11:54:12 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Jiri Slaby <jslaby@...e.cz>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial <linux-serial@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Tobias Klauser <tklauser@...tanz.ch>,
        Richard Genoud <richard.genoud@...il.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Liviu Dudau <liviu.dudau@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Andreas Färber <afaerber@...e.de>,
        Manivannan Sadhasivam <mani@...nel.org>
Subject: Re: [PATCH v4 09/10] tty: serial: use uart_port_tx() helper

On Tue, 20 Sep 2022, Jiri Slaby wrote:

> uart_port_tx() is a new helper to send characters to the device. Use it
> in these drivers.
> 
> Cc: Tobias Klauser <tklauser@...tanz.ch>
> Cc: Richard Genoud <richard.genoud@...il.com>
> Cc: Nicolas Ferre <nicolas.ferre@...rochip.com>
> Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
> Cc: Claudiu Beznea <claudiu.beznea@...rochip.com>
> Cc: Vladimir Zapolskiy <vz@...ia.com>
> Cc: Liviu Dudau <liviu.dudau@....com>
> Cc: Sudeep Holla <sudeep.holla@....com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Cc: Shawn Guo <shawnguo@...nel.org>
> Cc: Sascha Hauer <s.hauer@...gutronix.de>
> Cc: Pengutronix Kernel Team <kernel@...gutronix.de>
> Cc: Fabio Estevam <festevam@...il.com>
> Cc: NXP Linux Team <linux-imx@....com>
> Cc: "Andreas Färber" <afaerber@...e.de>
> Cc: Manivannan Sadhasivam <mani@...nel.org>
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> ---

> diff --git a/drivers/tty/serial/mcf.c b/drivers/tty/serial/mcf.c
> index b1cd9a76dd93..53b642ea46ba 100644
> --- a/drivers/tty/serial/mcf.c
> +++ b/drivers/tty/serial/mcf.c
> @@ -327,29 +327,13 @@ static void mcf_rx_chars(struct mcf_uart *pp)
>  static void mcf_tx_chars(struct mcf_uart *pp)
>  {
>  	struct uart_port *port = &pp->port;
> -	struct circ_buf *xmit = &port->state->xmit;
> -
> -	if (port->x_char) {
> -		/* Send special char - probably flow control */
> -		writeb(port->x_char, port->membase + MCFUART_UTB);
> -		port->x_char = 0;
> -		port->icount.tx++;
> -		return;
> -	}
> -
> -	while (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) {
> -		if (uart_circ_empty(xmit))
> -			break;
> -		writeb(xmit->buf[xmit->tail], port->membase + MCFUART_UTB);
> -		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
> -		port->icount.tx++;
> -	}
> -
> -	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
> -		uart_write_wakeup(port);
> +	unsigned int pending;
> +	u8 ch;
>  
> -	if (uart_circ_empty(xmit)) {
> -		mcf_stop_tx(port);
> +	pending = uart_port_tx(port, ch,
> +		readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY,
> +		writeb(ch, port->membase + MCFUART_UTB));
> +	if (!pending) {

Why unsigned int pending here and bool pending in the other cases?

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>


-- 
 i.