Re: [PATCH 6/8] serial: 8250_dwlib: remove redundant sanity check for RS485 flags

[Ilpo Järvinen]

On Wed, 22 Jun 2022, Lino Sanfilippo wrote:

> From: Lino Sanfilippo <l.sanfilippo@xxxxxxxxxx>
> 
> Before the drivers rs485_config() function is called the serial core
> already ensures that only one of both options RTS on send or RTS after send
> is set. So remove the concerning sanity check in the driver function to
> avoid redundancy.
> 
> Signed-off-by: Lino Sanfilippo <l.sanfilippo@xxxxxxxxxx>
> ---
>  drivers/tty/serial/8250/8250_dwlib.c | 10 ++--------
>  1 file changed, 2 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_dwlib.c b/drivers/tty/serial/8250/8250_dwlib.c
> index c83e7eaf3877..bed2bd6b7a01 100644
> --- a/drivers/tty/serial/8250/8250_dwlib.c
> +++ b/drivers/tty/serial/8250/8250_dwlib.c
> @@ -95,16 +95,10 @@ static int dw8250_rs485_config(struct uart_port *p, struct serial_rs485 *rs485)
>  	if (rs485->flags & SER_RS485_ENABLED) {
>  		tcr |= DW_UART_TCR_RS485_EN;
>  
> -		if (rs485->flags & SER_RS485_RX_DURING_TX) {
> +		if (rs485->flags & SER_RS485_RX_DURING_TX)
>  			tcr |= DW_UART_TCR_XFER_MODE_DE_DURING_RE;
> -		} else {
> -			/* HW does not support same DE level for tx and rx */
> -			if (!(rs485->flags & SER_RS485_RTS_ON_SEND) ==
> -			    !(rs485->flags & SER_RS485_RTS_AFTER_SEND))
> -				return -EINVAL;
> -
> +		else
>  			tcr |= DW_UART_TCR_XFER_MODE_DE_OR_RE;
> -		}
>  		dw8250_writel_ext(p, DW_UART_DE_EN, 1);
>  		dw8250_writel_ext(p, DW_UART_RE_EN, 1);
>  	} else {
> -- 

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>


-- 
 i.