linux-kernel - Re: [PATCH] tty: atmel_serial: use the correct RTS flag.

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Message-ID: <f6266cc7-bdf2-413e-929e-1d1c0d7e2786@bootlin.com>
Date: Fri, 9 Aug 2024 18:45:51 +0200
From: Richard GENOUD <richard.genoud@...tlin.com>
To: Mathieu Othacehe <othacehe@....org>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
 Nicolas Ferre <nicolas.ferre@...rochip.com>,
 linux-arm-kernel@...ts.infradead.org, Jiri Slaby <jirislaby@...nel.org>,
 Claudiu Beznea <claudiu.beznea@...on.dev>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: Re: [PATCH] tty: atmel_serial: use the correct RTS flag.

Hi,

Adding Ilpo to the list since he was the author.

Le 08/08/2024 à 08:06, Mathieu Othacehe a écrit :
> In RS485 mode, the RTS pin is driven high by hardware when the transmitter
> is operating. This behaviour cannot be changed. This means that the driver
> should claim that it supports SER_RS485_RTS_ON_SEND and not
> SER_RS485_RTS_AFTER_SEND.
> 
> Otherwise, when configuring the port with the SER_RS485_RTS_ON_SEND, one
> get the following warning:
> 
> kern.warning kernel: atmel_usart_serial atmel_usart_serial.2.auto:
> ttyS1 (1): invalid RTS setting, using RTS_AFTER_SEND instead
> 
> which is contradictory with what's really happening.
> 
> Signed-off-by: Mathieu Othacehe <othacehe@....org>
> ---
>   drivers/tty/serial/atmel_serial.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
> index 0a90964d6d107..09b246c9e389e 100644
> --- a/drivers/tty/serial/atmel_serial.c
> +++ b/drivers/tty/serial/atmel_serial.c
> @@ -2514,7 +2514,7 @@ static const struct uart_ops atmel_pops = {
>   };
>   
>   static const struct serial_rs485 atmel_rs485_supported = {
> -	.flags = SER_RS485_ENABLED | SER_RS485_RTS_AFTER_SEND | SER_RS485_RX_DURING_TX,
> +	.flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RX_DURING_TX,
>   	.delay_rts_before_send = 1,
>   	.delay_rts_after_send = 1,
>   };
Regards,
Ricahrd