netdev - Re: [RFC net-next 4/5] net: phy: Add support for IEEE standard test modes

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Message-ID: <20180430232049.GA25602@lunn.ch>
Date:   Tue, 1 May 2018 01:20:49 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, Russell King <rmk@...linux.org.uk>,
        open list <linux-kernel@...r.kernel.org>, davem@...emloft.net,
        cphealy@...il.com, nikita.yoush@...entembedded.com,
        vivien.didelot@...oirfairelinux.com, Nisar.Sayed@...rochip.com,
        UNGLinuxDriver@...rochip.com
Subject: Re: [RFC net-next 4/5] net: phy: Add support for IEEE standard test
 modes

> +/* genphy_set_test - Make a PHY enter one of the standard IEEE defined
> + * test modes
> + * @phydev: the PHY device instance
> + * @test: the desired test mode
> + * @data: test specific data (none)
> + *
> + * This function makes the designated @phydev enter the desired standard
> + * 100BaseT2 or 1000BaseT test mode as defined in IEEE 802.3-2012 section TWO
> + * and THREE under 32.6.1.2.1 and 40.6.1.1.2 respectively
> + */
> +int genphy_set_test(struct phy_device *phydev,
> +		    struct ethtool_phy_test *test, const u8 *data)
> +{
> +	u16 shift, base, bmcr = 0;
> +	int ret;
> +
> +	/* Exit test mode */
> +	if (test->mode == PHY_STD_TEST_MODE_NORMAL) {
> +		ret = phy_read(phydev, MII_CTRL1000);
> +		if (ret < 0)
> +			return ret;
> +
> +		ret &= ~GENMASK(15, 13);
> +
> +		return phy_write(phydev, MII_CTRL1000, ret);
> +	}

Hi Florain

I looked at the Marvell SDK for PHYs. It performs a soft reset after
swapping back to normal mode. I assume the broadcom PHY does not need
this? But maybe we can add it anyway?

> +
> +	switch (test->mode) {
> +	case PHY_STD_TEST_MODE_100BASET2_1:
> +	case PHY_STD_TEST_MODE_100BASET2_2:
> +	case PHY_STD_TEST_MODE_100BASET2_3:
> +		if (!(phydev->supported & PHY_100BT_FEATURES))
> +			return -EOPNOTSUPP;
> +
> +		shift = 14;
> +		base = test->mode - PHY_STD_TEST_MODE_NORMAL;
> +		bmcr = BMCR_SPEED100;
> +		break;
> +
> +	case PHY_STD_TEST_MODE_1000BASET_1:
> +	case PHY_STD_TEST_MODE_1000BASET_2:
> +	case PHY_STD_TEST_MODE_1000BASET_3:
> +	case PHY_STD_TEST_MODE_1000BASET_4:
> +		if (!(phydev->supported & PHY_1000BT_FEATURES))
> +			return -EOPNOTSUPP;
> +
> +		shift = 13;
> +		base = test->mode - PHY_STD_TEST_MODE_100BASET2_MAX;
> +		bmcr = BMCR_SPEED1000;
> +		break;
> +
> +	default:
> +		/* Let an upper driver deal with additional modes it may
> +		 * support
> +		 */
> +		return -EOPNOTSUPP;
> +	}
> +
> +	/* Force speed and duplex */
> +	ret = phy_write(phydev, MII_BMCR, bmcr | BMCR_FULLDPLX);
> +	if (ret < 0)
> +		return ret;

Should there be something to undo this when returning to normal mode?

       Andrew