linux-kernel - Re: [PATCH v2] serial: atmel: convert not to use dma_request_slave

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Message-Id: <20231120115152.77214ee015e6c501e500b22a@hugovil.com>
Date:   Mon, 20 Nov 2023 11:51:52 -0500
From:   Hugo Villeneuve <hugo@...ovil.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Richard Genoud <richard.genoud@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...on.dev>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] serial: atmel: convert not to use
 dma_request_slave_channel()

On Sun, 19 Nov 2023 16:55:15 +0100
Christophe JAILLET <christophe.jaillet@...adoo.fr> wrote:

Hi,
change the subject to:

"... replace deprecated dma_request_slave_channel()"

Hugo.


> dma_request_slave_channel() is deprecated. dma_request_chan() should
> be used directly instead.
> 
> Switch to the preferred function and update the error handling accordingly.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> v2: Also update atmel_prepare_rx_dma()
> ---
>  drivers/tty/serial/atmel_serial.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
> index 1946fafc3f3e..6aeb4648843b 100644
> --- a/drivers/tty/serial/atmel_serial.c
> +++ b/drivers/tty/serial/atmel_serial.c
> @@ -1013,14 +1013,18 @@ static int atmel_prepare_tx_dma(struct uart_port *port)
>  	struct device *mfd_dev = port->dev->parent;
>  	dma_cap_mask_t		mask;
>  	struct dma_slave_config config;
> +	struct dma_chan *chan;
>  	int ret, nent;
>  
>  	dma_cap_zero(mask);
>  	dma_cap_set(DMA_SLAVE, mask);
>  
> -	atmel_port->chan_tx = dma_request_slave_channel(mfd_dev, "tx");
> -	if (atmel_port->chan_tx == NULL)
> +	chan = dma_request_chan(mfd_dev, "tx");
> +	if (IS_ERR(chan)) {
> +		atmel_port->chan_tx = NULL;
>  		goto chan_err;
> +	}
> +	atmel_port->chan_tx = chan;
>  	dev_info(port->dev, "using %s for tx DMA transfers\n",
>  		dma_chan_name(atmel_port->chan_tx));
>  
> @@ -1188,6 +1192,7 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
>  	dma_cap_mask_t		mask;
>  	struct dma_slave_config config;
>  	struct circ_buf		*ring;
> +	struct dma_chan *chan;
>  	int ret, nent;
>  
>  	ring = &atmel_port->rx_ring;
> @@ -1195,9 +1200,12 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
>  	dma_cap_zero(mask);
>  	dma_cap_set(DMA_CYCLIC, mask);
>  
> -	atmel_port->chan_rx = dma_request_slave_channel(mfd_dev, "rx");
> -	if (atmel_port->chan_rx == NULL)
> +	chan = dma_request_chan(mfd_dev, "rx");
> +	if (IS_ERR(chan)) {
> +		atmel_port->chan_rx = NULL;
>  		goto chan_err;
> +	}
> +	atmel_port->chan_rx = chan;
>  	dev_info(port->dev, "using %s for rx DMA transfers\n",
>  		dma_chan_name(atmel_port->chan_rx));
>  
> -- 
> 2.34.1
>