netdev - Re: [PATCH] net: phy: marvell: add special handling of Finisar modules with 81E1111

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Date:   Mon, 19 Oct 2020 23:00:23 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Robert Hancock <robert.hancock@...ian.com>
Cc:     hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH] net: phy: marvell: add special handling of Finisar
 modules with 81E1111

> +static int m88e1111_finisar_config_init(struct phy_device *phydev)
> +{
> +	int err;
> +	int extsr = phy_read(phydev, MII_M1111_PHY_EXT_SR);
> +
> +	if (extsr < 0)
> +		return extsr;
> +
> +	/* If using 1000BaseX and 1000BaseX auto-negotiation is disabled, enable it */
> +	if (phydev->interface == PHY_INTERFACE_MODE_1000BASEX &&
> +	    (extsr & MII_M1111_HWCFG_MODE_MASK) ==
> +	    MII_M1111_HWCFG_MODE_COPPER_1000BX_NOAN) {
> +		err = phy_modify(phydev, MII_M1111_PHY_EXT_SR,
> +				 MII_M1111_HWCFG_MODE_MASK |
> +				 MII_M1111_HWCFG_SERIAL_AN_BYPASS,
> +				 MII_M1111_HWCFG_MODE_COPPER_1000BX_AN |
> +				 MII_M1111_HWCFG_SERIAL_AN_BYPASS);
> +		if (err < 0)
> +			return err;
> +	}
> +
> +	return m88e1111_config_init(phydev);
> +}

Hi Robert

Is this really specific to the Finisar? It seems like any application
of the m88e1111 in 1000BaseX would benefit from this?

   Andrew