Commit fe4bf60f authored by Gerhard Engleder's avatar Gerhard Engleder Committed by Paolo Abeni
Browse files

net: phy: micrel: Add loopback support 



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

Signed-off-by: default avatarGerhard Engleder <gerhard@engleder-embedded.com>
Reviewed-by: default avatarMaxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20250312203010.47429-4-gerhard@engleder-embedded.com


Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
parent 0d60fd50

drivers/net/phy/micrel.c

+24 −0
Original line number Diff line number Diff line
@@ -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,