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net: phy: micrel: Add loopback support

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The KSZ9031 PHYs requires full duplex for loopback mode. Add PHY
specific set_loopback() to ensure this.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20250312203010.47429-4-gerhard@engleder-embedded.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Gerhard Engleder 2025-03-12 21:30:08 +01:00 • committed by Paolo Abeni
parent 0d60fd5032
commit fe4bf60ffd
1 changed files with 24 additions and 0 deletions
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24
drivers/net/phy/micrel.c
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@ -1032,6 +1032,29 @@ static int ksz9021_config_init(struct phy_device *phydev)
#define MII_KSZ9031RN_EDPD 0x23
#define MII_KSZ9031RN_EDPD_ENABLE BIT(0)
static int ksz9031_set_loopback(struct phy_device *phydev, bool enable,
int speed)
{
u16 ctl = BMCR_LOOPBACK;
int val;
if (!enable)
return genphy_loopback(phydev, enable, 0);
if (speed == SPEED_10 || speed == SPEED_100 || speed == SPEED_1000)
phydev->speed = speed;
else if (speed)
return -EINVAL;
phydev->duplex = DUPLEX_FULL;
ctl |= mii_bmcr_encode_fixed(phydev->speed, phydev->duplex);
phy_write(phydev, MII_BMCR, ctl);
return phy_read_poll_timeout(phydev, MII_BMSR, val, val & BMSR_LSTATUS,
5000, 500000, true);
}
static int ksz9031_of_load_skew_values(struct phy_device *phydev,
const struct device_node *of_node,
u16 reg, size_t field_sz,
@ -5565,6 +5588,7 @@ static struct phy_driver ksphy_driver[] = {
.resume = kszphy_resume,
.cable_test_start = ksz9x31_cable_test_start,
.cable_test_get_status = ksz9x31_cable_test_get_status,
.set_loopback = ksz9031_set_loopback,
}, {
.phy_id = PHY_ID_LAN8814,
.phy_id_mask = MICREL_PHY_ID_MASK,