netdev - Re: [PATCH net-next v2 2/2] dsa: lan9303: Move to PHYLINK

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Message-ID: <Y4pX//cG2Hq8NvbM@shell.armlinux.org.uk>
Date:   Fri, 2 Dec 2022 19:54:39 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Jerry Ray <jerry.ray@...rochip.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 2/2] dsa: lan9303: Move to PHYLINK

Hi Jerry,

On Fri, Dec 02, 2022 at 01:17:49PM -0600, Jerry Ray wrote:
> -static void lan9303_adjust_link(struct dsa_switch *ds, int port,
> -				struct phy_device *phydev)
> -{
> -	struct lan9303 *chip = ds->priv;
> -	int ctl;
> -
> -	if (!phy_is_pseudo_fixed_link(phydev))
> -		return;
> -
> -	ctl = lan9303_phy_read(ds, port, MII_BMCR);
> -
> -	ctl &= ~BMCR_ANENABLE;
> -
> -	if (phydev->speed == SPEED_100)
> -		ctl |= BMCR_SPEED100;
> -	else if (phydev->speed == SPEED_10)
> -		ctl &= ~BMCR_SPEED100;
> -	else
> -		dev_err(ds->dev, "unsupported speed: %d\n", phydev->speed);
> -
> -	if (phydev->duplex == DUPLEX_FULL)
> -		ctl |= BMCR_FULLDPLX;
> -	else
> -		ctl &= ~BMCR_FULLDPLX;
> -
> -	lan9303_phy_write(ds, port, MII_BMCR, ctl);
> -
> -	if (port == chip->phy_addr_base) {
> -		/* Virtual Phy: Remove Turbo 200Mbit mode */
> -		lan9303_read(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, &ctl);
> -
> -		ctl &= ~LAN9303_VIRT_SPECIAL_TURBO;
> -		regmap_write(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, ctl);
> -	}
> -}

Is this functionality no longer necessary? For example, I don't see
anywhere else in the driver that this turbo mode is disabled.

I'm guessing the above code writing MII_BMCR is to force the
configuration of integrated PHYs to be the fixed-link settings?
How is that dealt with after the removal of the above code?

> -
>  static int lan9303_port_enable(struct dsa_switch *ds, int port,
>  			       struct phy_device *phy)
>  {
> @@ -1279,6 +1243,41 @@ static int lan9303_port_mdb_del(struct dsa_switch *ds, int port,
>  	return 0;
>  }
>  
> +static void lan9303_phylink_get_caps(struct dsa_switch *ds, int port,
> +				     struct phylink_config *config)
> +{
> +	struct lan9303 *chip = ds->priv;
> +
> +	dev_dbg(chip->dev, "%s(%d) entered.", __func__, port);
> +
> +	config->mac_capabilities = MAC_10 | MAC_100 | MAC_ASYM_PAUSE |
> +				   MAC_SYM_PAUSE;
> +
> +	if (dsa_port_is_cpu(dsa_to_port(ds, port))) {
> +		/* cpu port */
> +		phy_interface_empty(config->supported_interfaces);

This should not be necessary - the supported_interfaces member should
already be zero.

Thanks.

-- 
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