netdev - Re: [PATCH] net: phy: DP83TC811: Introduce support for the DP83TC811 phy

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Date:   Wed, 9 May 2018 15:43:15 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Dan Murphy <dmurphy@...com>
Cc:     f.fainelli@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: phy: DP83TC811: Introduce support for the DP83TC811
 phy

> +static int dp83811_config_aneg(struct phy_device *phydev)
> +{
> +	int err;
> +	int value;
> +
> +	value = phy_read(phydev, MII_DP83811_SGMII_CTRL);
> +	if (phydev->autoneg == AUTONEG_ENABLE) {
> +		err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
> +				(DP83811_SGMII_AUTO_NEG_EN | value));
> +		if (err < 0)
> +			return err;
> +	} else {
> +		err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
> +				(~DP83811_SGMII_AUTO_NEG_EN & value));
> +		if (err < 0)
> +			return err;
> +	}
> +

Hi Dan

You say SGMII is unreliable on one of these devices. Should you check
phydev->interface before enabling SGMII autoneg?

> +	return genphy_config_aneg(phydev);
> +}
> +
> +static int dp83811_config_init(struct phy_device *phydev)
> +{
> +	int err;
> +	int value;
> +
> +	err = genphy_config_init(phydev);
> +	if (err < 0)
> +		return err;
> +
> +	if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
> +		value = phy_read(phydev, MII_DP83811_SGMII_CTRL);
> +		if (!(value & DP83811_SGMII_EN)) {
> +			err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
> +					(DP83811_SGMII_EN | value));
> +			if (err < 0)
> +				return err;
> +		} else {
> +			err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
> +				(~DP83811_SGMII_EN & value));
> +			if (err < 0)
> +				return err;
> +		}

This looks to be a duplicate of dp83811_config_aneg()?

> +	}
> +
> +	value = DP83811_WOL_MAGIC_EN | DP83811_WOL_SECURE_ON | DP83811_WOL_EN;
> +
> +	return phy_write_mmd(phydev, DP83811_DEVADDR, MII_DP83811_WOL_CFG,
> +	      value);
> +}
> +
> +static int dp83811_phy_reset(struct phy_device *phydev)
> +{
> +	int err;
> +
> +	err = phy_write(phydev, MII_DP83811_RESET_CTRL, DP83811_HW_RESET);
> +	if (err < 0)
> +		return err;
> +
> +	dp83811_config_init(phydev);

I don't think you need to initialize it here. phylib should call that
soon after the reset.

> +
> +	return 0;
> +}
> +

> +static struct phy_driver dp83811_driver[] = {
> +	{
> +		.phy_id = DP83TC811_PHY_ID,
> +		.phy_id_mask = 0xfffffff0,
> +		.name = "TI DP83TC811",
> +		.features = PHY_BASIC_FEATURES,
> +		.flags = PHY_HAS_INTERRUPT,
> +		.config_init = genphy_config_init,

????

	Andrew