PHY loopback is needed for the ethernet controller self test support.
This PHY was tested with the FEC sefltest.
Signed-off-by: Oleksij Rempel <o.rem...@pengutronix.de>
---
drivers/net/phy/at803x.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index d7799beb811c..8679738cf2ab 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -326,6 +326,30 @@ static int at803x_resume(struct phy_device *phydev)
return phy_modify(phydev, MII_BMCR, BMCR_PDOWN | BMCR_ISOLATE, 0);
}
+static int at803x_loopback(struct phy_device *phydev, bool enable)
+{
+ int ret;
+
+ if (enable)
+ ret = phy_clear_bits(phydev, MII_BMCR, BMCR_ANENABLE);
+ else
+ ret = phy_set_bits(phydev, MII_BMCR, BMCR_ANENABLE);
+
+ if (ret)
+ return ret;
+
+ ret = genphy_loopback(phydev, enable);
+
+ /*
+ * Loop back needs some time to start transmitting packets in the loop.
+ * Documentation says nothing about it, so I take time which seems to
+ * work on AR8085.
+ */
+ msleep(1);
+
+ return ret;
+}
+
static int at803x_rgmii_reg_set_voltage_sel(struct regulator_dev *rdev,
unsigned int selector)
{
@@ -1128,6 +1152,7 @@ static struct phy_driver at803x_driver[] = {
.get_wol = at803x_get_wol,
.suspend = at803x_suspend,
.resume = at803x_resume,
+ .set_loopback = at803x_loopback,
/* PHY_GBIT_FEATURES */
.read_status = at803x_read_status,
.config_intr = at803x_config_intr,
--
2.29.2
