netdev - Re: [PATCH net-next] net: dsa: mc88e6xxx: Fix 88E6141/6341 2500mbps SERDES speed

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Date:   Fri, 5 Oct 2018 23:20:55 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Marek Behún <marek.behun@....cz>
Cc:     netdev <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next] net: dsa: mc88e6xxx: Fix 88E6141/6341 2500mbps
 SERDES speed

On Fri, Oct 05, 2018 at 04:42:27PM +0200, Marek Behún wrote:
> The port_set_speed method for the Topaz family must not be the same
> as for Peridot family, since on Topaz port 5 is the SERDES port and it
> can be set to 2500mbps speed mode.
> 
> This patch adds a new method for the Topaz family, allowing the alt_bit
> mode only for port 0 and the 2500 mbps mode for port 5.
> 
> diff --git a/drivers/net/dsa/mv88e6xxx/port.c b/drivers/net/dsa/mv88e6xxx/port.c
> index 92945841c8e8..cd7db60a508b 100644
> --- a/drivers/net/dsa/mv88e6xxx/port.c
> +++ b/drivers/net/dsa/mv88e6xxx/port.c
> @@ -228,8 +228,11 @@ static int mv88e6xxx_port_set_speed(struct mv88e6xxx_chip *chip, int port,
>  		ctrl = MV88E6XXX_PORT_MAC_CTL_SPEED_1000;
>  		break;
>  	case 2500:
> -		ctrl = MV88E6390_PORT_MAC_CTL_SPEED_10000 |
> -			MV88E6390_PORT_MAC_CTL_ALTSPEED;
> +		if (alt_bit)
> +			ctrl = MV88E6390_PORT_MAC_CTL_SPEED_10000 |
> +				MV88E6390_PORT_MAC_CTL_ALTSPEED;
> +		else
> +			ctrl = MV88E6390_PORT_MAC_CTL_SPEED_10000;
>  		break;
>  	case 10000:
>  		/* all bits set, fall through... */
> @@ -291,6 +294,24 @@ int mv88e6185_port_set_speed(struct mv88e6xxx_chip *chip, int port, int speed)
>  	return mv88e6xxx_port_set_speed(chip, port, speed, false, false);
>  }
>  
> +/* Support 10, 100, 200, 1000, 2500 Mbps (e.g. 88E6341) */
> +int mv88e6341_port_set_speed(struct mv88e6xxx_chip *chip, int port, int speed)
> +{
> +	if (speed == SPEED_MAX)
> +		speed = port < 5 ? 1000 : 2500;
> +
> +	if (speed > 2500)
> +		return -EOPNOTSUPP;
> +
> +	if (speed == 200 && port != 0)
> +		return -EOPNOTSUPP;
> +
> +	if (speed == 2500 && port < 5)
> +		return -EOPNOTSUPP;
> +
> +	return mv88e6xxx_port_set_speed(chip, port, speed, !port, true);

Hi Marek

I'm confused.

The alt bit is used for configuring 2500. You say 2500 is only
supported on port 5. But !port is only true for port 0?

	  Andrew