netdev - Re: [PATCH net-next] net: dsa: sja1105: Add support for the SGMII port

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Date:   Fri, 20 Mar 2020 00:06:22 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, andrew@...n.ch,
        f.fainelli@...il.com, vivien.didelot@...il.com
Subject: Re: [PATCH net-next] net: dsa: sja1105: Add support for the SGMII
 port

On Fri, Mar 20, 2020 at 01:53:13AM +0200, Vladimir Oltean wrote:
> @@ -774,10 +881,14 @@ static void sja1105_mac_config(struct dsa_switch *ds, int port,
>  		return;
>  	}
>  
> -	if (link_an_mode == MLO_AN_INBAND) {
> +	if (link_an_mode == MLO_AN_INBAND && !is_sgmii) {
>  		dev_err(ds->dev, "In-band AN not supported!\n");
>  		return;
>  	}
> +
> +	if (is_sgmii)
> +		sja1105_sgmii_config(priv, port, link_an_mode == MLO_AN_INBAND,
> +				     state->speed);

Please avoid new usages of state->speed in mac_config() - I'm trying
to eliminate them now that the mac_link_up() patches are in.  If you
need to set the PCS for the link speed, please hook that into
mac_link_up() instead.

>  }
>  
>  static void sja1105_mac_link_down(struct dsa_switch *ds, int port,
> @@ -833,7 +944,8 @@ static void sja1105_phylink_validate(struct dsa_switch *ds, int port,
>  	phylink_set(mask, 10baseT_Full);
>  	phylink_set(mask, 100baseT_Full);
>  	phylink_set(mask, 100baseT1_Full);
> -	if (mii->xmii_mode[port] == XMII_MODE_RGMII)
> +	if (mii->xmii_mode[port] == XMII_MODE_RGMII ||
> +	    mii->xmii_mode[port] == XMII_MODE_SGMII)
>  		phylink_set(mask, 1000baseT_Full);
>  
>  	bitmap_and(supported, supported, mask, __ETHTOOL_LINK_MODE_MASK_NBITS);
> @@ -841,6 +953,82 @@ static void sja1105_phylink_validate(struct dsa_switch *ds, int port,
>  		   __ETHTOOL_LINK_MODE_MASK_NBITS);
>  }
>  
> +static int sja1105_mac_pcs_get_state(struct dsa_switch *ds, int port,
> +				     struct phylink_link_state *state)
> +{
> +	struct sja1105_private *priv = ds->priv;
> +	int bmcr;
> +
> +	bmcr = sja1105_sgmii_read(priv, MII_BMCR);
> +	if (bmcr < 0)
> +		return bmcr;
> +
> +	state->an_enabled = !!(bmcr & BMCR_ANENABLE);
> +
> +	if (state->an_enabled) {

mac_pcs_get_state() is only called when in in-band AN mode, so this
is not useful.  If it's called with AN disabled, that's a bug.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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