netdev - Re: [PATCH] net: axienet: Properly handle PCS/PMA PHY for 1000BaseX mode

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Date:   Mon, 19 Oct 2020 23:36:38 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Robert Hancock <robert.hancock@...ian.com>
Cc:     radhey.shyam.pandey@...inx.com, davem@...emloft.net,
        kuba@...nel.org, michal.simek@...inx.com, linux@...linux.org.uk,
        netdev@...r.kernel.org
Subject: Re: [PATCH] net: axienet: Properly handle PCS/PMA PHY for 1000BaseX
 mode

>  static void axienet_mac_config(struct phylink_config *config, unsigned int mode,
>  			       const struct phylink_link_state *state)
>  {
> -	/* nothing meaningful to do */
> +	struct net_device *ndev = to_net_dev(config->dev);
> +	struct axienet_local *lp = netdev_priv(ndev);
> +	int ret;
> +
> +	switch (state->interface) {
> +	case PHY_INTERFACE_MODE_SGMII:
> +	case PHY_INTERFACE_MODE_1000BASEX:
> +		ret = phylink_mii_c22_pcs_config(lp->pcs_phy, mode,
> +						 state->interface,
> +						 state->advertising);
> +		if (ret < 0)
> +			netdev_warn(ndev, "Failed to configure PCS: %d\n",
> +				    ret);
> +
> +		/* Ensure isolate bit is cleared */
> +		ret = mdiobus_modify(lp->pcs_phy->bus, lp->pcs_phy->addr,
> +				     MII_BMCR, BMCR_ISOLATE, 0);

Hi Robert

That looks like a layering violation. Maybe move this into
phylink_mii_c22_pcs_config(), it is accessing MII_BMCR anyway.

      Andrew