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authorOleksij Rempel <o.rempel@pengutronix.de>2021-04-19 15:01:02 +0200
committerDavid S. Miller <davem@davemloft.net>2021-04-20 16:08:02 -0700
commit014068dcb5b17dae110354c4de241833124edba1 (patch)
tree3499634ec0f208cf20e67d7cb1278c552b4b46c5
parentf4f86d8d2c04bc0c90f8d944a1fcc30349ba01b3 (diff)
net: phy: genphy_loopback: add link speed configuration
In case of loopback, in most cases we need to disable autoneg support and force some speed configuration. Otherwise, depending on currently active auto negotiated link speed, the loopback may or may not work. This patch was tested with following PHYs: TJA1102, KSZ8081, KSZ9031, AT8035, AR9331. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/phy/phy.c3
-rw-r--r--drivers/net/phy/phy_device.c28
-rw-r--r--include/linux/phy.h1
3 files changed, 29 insertions, 3 deletions
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index fc2e7cb5b2e5..1f0512e39c65 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -701,7 +701,7 @@ out:
}
EXPORT_SYMBOL(phy_start_cable_test_tdr);
-static int phy_config_aneg(struct phy_device *phydev)
+int phy_config_aneg(struct phy_device *phydev)
{
if (phydev->drv->config_aneg)
return phydev->drv->config_aneg(phydev);
@@ -714,6 +714,7 @@ static int phy_config_aneg(struct phy_device *phydev)
return genphy_config_aneg(phydev);
}
+EXPORT_SYMBOL(phy_config_aneg);
/**
* phy_check_link_status - check link status and set state accordingly
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 320a3e5cd10a..0a2d8bedf73d 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -2565,8 +2565,32 @@ EXPORT_SYMBOL(genphy_resume);
int genphy_loopback(struct phy_device *phydev, bool enable)
{
- return phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK,
- enable ? BMCR_LOOPBACK : 0);
+ if (enable) {
+ u16 val, ctl = BMCR_LOOPBACK;
+ int ret;
+
+ if (phydev->speed == SPEED_1000)
+ ctl |= BMCR_SPEED1000;
+ else if (phydev->speed == SPEED_100)
+ ctl |= BMCR_SPEED100;
+
+ if (phydev->duplex == DUPLEX_FULL)
+ ctl |= BMCR_FULLDPLX;
+
+ phy_modify(phydev, MII_BMCR, ~0, ctl);
+
+ ret = phy_read_poll_timeout(phydev, MII_BMSR, val,
+ val & BMSR_LSTATUS,
+ 5000, 500000, true);
+ if (ret)
+ return ret;
+ } else {
+ phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, 0);
+
+ phy_config_aneg(phydev);
+ }
+
+ return 0;
}
EXPORT_SYMBOL(genphy_loopback);
diff --git a/include/linux/phy.h b/include/linux/phy.h
index e3d4d583463b..60d2b26026a2 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1410,6 +1410,7 @@ void phy_disconnect(struct phy_device *phydev);
void phy_detach(struct phy_device *phydev);
void phy_start(struct phy_device *phydev);
void phy_stop(struct phy_device *phydev);
+int phy_config_aneg(struct phy_device *phydev);
int phy_start_aneg(struct phy_device *phydev);
int phy_aneg_done(struct phy_device *phydev);
int phy_speed_down(struct phy_device *phydev, bool sync);