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

Florian Fainelli
2018-05-01T17:03:59Z

On 04/30/2018 04:20 PM, Andrew Lunn wrote:
>> +/* 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?

We certainly should reset the PHY, thanks!

>
>> +
>> + 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?

Yes, resetting the PHY would perform that.
--
Florian