Merge branch 'ksz9477-eee-support'

Oleksij Rempel says:

====================
net: add EEE support for KSZ9477 switch family

changes v8:
- fix comment for linkmode_to_mii_eee_cap1_t() function
- add Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>
- add Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>

changes v7:
- update documentation for genphy_c45_eee_is_active()
- address review comments on "net: dsa: microchip: enable EEE support"
  patch

changes v6:
- split patch set and send only first 9 patches
- Add Reviewed-by: Andrew Lunn <andrew@lunn.ch>
- use 0xffff instead of GENMASK
- Document @supported_eee
- use "()" with function name in comments

changes v5:
- spell fixes
- move part of genphy_c45_read_eee_abilities() to
  genphy_c45_read_eee_cap1()
- validate MDIO_PCS_EEE_ABLE register against 0xffff val.
- rename *eee_100_10000* to *eee_cap1*
- use linkmode_intersects(phydev->supported, PHY_EEE_CAP1_FEATURES)
  instead of !linkmode_empty()
- add documentation to linkmode/register helpers

changes v4:
- remove following helpers:
  mmd_eee_cap_to_ethtool_sup_t
  mmd_eee_adv_to_ethtool_adv_t
  ethtool_adv_to_mmd_eee_adv_t
  and port drivers from this helpers to linkmode helpers.
- rebase against latest net-next
- port phy_init_eee() to genphy_c45_eee_is_active()

changes v3:
- rework some parts of EEE infrastructure and move it to c45 code.
- add supported_eee storage and start using it in EEE code and by the
  micrel driver.
- add EEE support for ar8035 PHY
- add SmartEEE support to FEC i.MX series.

changes v2:
- use phydev->supported instead of reading MII_BMSR regiaster
- fix @get_eee > @set_eee

With this patch series we provide EEE control for KSZ9477 family of
switches and
AR8035 with i.MX6 configuration.
According to my tests, on a system with KSZ8563 switch and 100Mbit idle
link,
we consume 0,192W less power per port if EEE is enabled.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

8 files changed, 554 insertions, 137 deletions

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 46becc0382d6..729b36eeb2c4 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2673,6 +2673,70 @@ static int ksz_max_mtu(struct dsa_switch *ds, int port)
 	return -EOPNOTSUPP;
 }
 
+static int ksz_validate_eee(struct dsa_switch *ds, int port)
+{
+	struct ksz_device *dev = ds->priv;
+
+	if (!dev->info->internal_phy[port])
+		return -EOPNOTSUPP;
+
+	switch (dev->chip_id) {
+	case KSZ8563_CHIP_ID:
+	case KSZ9477_CHIP_ID:
+	case KSZ9563_CHIP_ID:
+	case KSZ9567_CHIP_ID:
+	case KSZ9893_CHIP_ID:
+	case KSZ9896_CHIP_ID:
+	case KSZ9897_CHIP_ID:
+		return 0;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static int ksz_get_mac_eee(struct dsa_switch *ds, int port,
+			   struct ethtool_eee *e)
+{
+	int ret;
+
+	ret = ksz_validate_eee(ds, port);
+	if (ret)
+		return ret;
+
+	/* There is no documented control of Tx LPI configuration. */
+	e->tx_lpi_enabled = true;
+
+	/* There is no documented control of Tx LPI timer. According to tests
+	 * Tx LPI timer seems to be set by default to minimal value.
+	 */
+	e->tx_lpi_timer = 0;
+
+	return 0;
+}
+
+static int ksz_set_mac_eee(struct dsa_switch *ds, int port,
+			   struct ethtool_eee *e)
+{
+	struct ksz_device *dev = ds->priv;
+	int ret;
+
+	ret = ksz_validate_eee(ds, port);
+	if (ret)
+		return ret;
+
+	if (!e->tx_lpi_enabled) {
+		dev_err(dev->dev, "Disabling EEE Tx LPI is not supported\n");
+		return -EINVAL;
+	}
+
+	if (e->tx_lpi_timer) {
+		dev_err(dev->dev, "Setting EEE Tx LPI timer is not supported\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static void ksz_set_xmii(struct ksz_device *dev, int port,
 			 phy_interface_t interface)
 {
@@ -3130,6 +3194,8 @@ static const struct dsa_switch_ops ksz_switch_ops = {
 	.port_txtstamp		= ksz_port_txtstamp,
 	.port_rxtstamp		= ksz_port_rxtstamp,
 	.port_setup_tc		= ksz_setup_tc,
+	.get_mac_eee		= ksz_get_mac_eee,
+	.set_mac_eee		= ksz_set_mac_eee,
 };
 
 struct ksz_device *ksz_switch_alloc(struct device *base, void *priv)
diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 330c76328da0..2c84fccef4f6 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -1392,6 +1392,26 @@ static int ksz9131_config_aneg(struct phy_device *phydev)
 	return genphy_config_aneg(phydev);
 }
 
+static int ksz9477_get_features(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = genphy_read_abilities(phydev);
+	if (ret)
+		return ret;
+
+	/* The "EEE control and capability 1" (Register 3.20) seems to be
+	 * influenced by the "EEE advertisement 1" (Register 7.60). Changes
+	 * on the 7.60 will affect 3.20. So, we need to construct our own list
+	 * of caps.
+	 * KSZ8563R should have 100BaseTX/Full only.
+	 */
+	linkmode_and(phydev->supported_eee, phydev->supported,
+		     PHY_EEE_CAP1_FEATURES);
+
+	return 0;
+}
+
 #define KSZ8873MLL_GLOBAL_CONTROL_4	0x06
 #define KSZ8873MLL_GLOBAL_CONTROL_4_DUPLEX	BIT(6)
 #define KSZ8873MLL_GLOBAL_CONTROL_4_SPEED	BIT(4)
@@ -4172,6 +4192,7 @@ static struct phy_driver ksphy_driver[] = {
 	.handle_interrupt = kszphy_handle_interrupt,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
+	.get_features	= ksz9477_get_features,
 } };
 
 module_phy_driver(ksphy_driver);
diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index 9f9565a4819d..ef36582adbeb 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -262,7 +262,11 @@ int genphy_c45_an_config_aneg(struct phy_device *phydev)
 	linkmode_and(phydev->advertising, phydev->advertising,
 		     phydev->supported);
 
-	changed = genphy_config_eee_advert(phydev);
+	ret = genphy_c45_write_eee_adv(phydev, phydev->supported_eee);
+	if (ret < 0)
+		return ret;
+	else if (ret)
+		changed = true;
 
 	if (genphy_c45_baset1_able(phydev))
 		return genphy_c45_baset1_an_config_aneg(phydev);
@@ -662,6 +666,199 @@ int genphy_c45_read_mdix(struct phy_device *phydev)
 EXPORT_SYMBOL_GPL(genphy_c45_read_mdix);
 
 /**
+ * genphy_c45_write_eee_adv - write advertised EEE link modes
+ * @phydev: target phy_device struct
+ * @adv: the linkmode advertisement settings
+ */
+int genphy_c45_write_eee_adv(struct phy_device *phydev, unsigned long *adv)
+{
+	int val, changed;
+
+	if (linkmode_intersects(phydev->supported, PHY_EEE_CAP1_FEATURES)) {
+		val = linkmode_to_mii_eee_cap1_t(adv);
+
+		/* In eee_broken_modes are stored MDIO_AN_EEE_ADV specific raw
+		 * register values.
+		 */
+		val &= ~phydev->eee_broken_modes;
+
+		/* IEEE 802.3-2018 45.2.7.13 EEE advertisement 1
+		 * (Register 7.60)
+		 */
+		val = phy_modify_mmd_changed(phydev, MDIO_MMD_AN,
+					     MDIO_AN_EEE_ADV,
+					     MDIO_EEE_100TX | MDIO_EEE_1000T |
+					     MDIO_EEE_10GT | MDIO_EEE_1000KX |
+					     MDIO_EEE_10GKX4 | MDIO_EEE_10GKR,
+					     val);
+		if (val < 0)
+			return val;
+		if (val > 0)
+			changed = 1;
+	}
+
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT,
+			      phydev->supported_eee)) {
+		val = linkmode_adv_to_mii_10base_t1_t(adv);
+		/* IEEE 802.3cg-2019 45.2.7.25 10BASE-T1 AN control register
+		 * (Register 7.526)
+		 */
+		val = phy_modify_mmd_changed(phydev, MDIO_MMD_AN,
+					     MDIO_AN_10BT1_AN_CTRL,
+					     MDIO_AN_10BT1_AN_CTRL_ADV_EEE_T1L,
+					     val);
+		if (val < 0)
+			return val;
+		if (val > 0)
+			changed = 1;
+	}
+
+	return changed;
+}
+
+/**
+ * genphy_c45_read_eee_adv - read advertised EEE link modes
+ * @phydev: target phy_device struct
+ * @adv: the linkmode advertisement status
+ */
+static int genphy_c45_read_eee_adv(struct phy_device *phydev,
+				   unsigned long *adv)
+{
+	int val;
+
+	if (linkmode_intersects(phydev->supported, PHY_EEE_CAP1_FEATURES)) {
+		/* IEEE 802.3-2018 45.2.7.13 EEE advertisement 1
+		 * (Register 7.60)
+		 */
+		val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
+		if (val < 0)
+			return val;
+
+		mii_eee_cap1_mod_linkmode_t(adv, val);
+	}
+
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT,
+			      phydev->supported_eee)) {
+		/* IEEE 802.3cg-2019 45.2.7.25 10BASE-T1 AN control register
+		 * (Register 7.526)
+		 */
+		val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_10BT1_AN_CTRL);
+		if (val < 0)
+			return val;
+
+		mii_10base_t1_adv_mod_linkmode_t(adv, val);
+	}
+
+	return 0;
+}
+
+/**
+ * genphy_c45_read_eee_lpa - read advertised LP EEE link modes
+ * @phydev: target phy_device struct
+ * @lpa: the linkmode LP advertisement status
+ */
+static int genphy_c45_read_eee_lpa(struct phy_device *phydev,
+				   unsigned long *lpa)
+{
+	int val;
+
+	if (linkmode_intersects(phydev->supported, PHY_EEE_CAP1_FEATURES)) {
+		/* IEEE 802.3-2018 45.2.7.14 EEE link partner ability 1
+		 * (Register 7.61)
+		 */
+		val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
+		if (val < 0)
+			return val;
+
+		mii_eee_cap1_mod_linkmode_t(lpa, val);
+	}
+
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT,
+			      phydev->supported_eee)) {
+		/* IEEE 802.3cg-2019 45.2.7.26 10BASE-T1 AN status register
+		 * (Register 7.527)
+		 */
+		val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_10BT1_AN_STAT);
+		if (val < 0)
+			return val;
+
+		mii_10base_t1_adv_mod_linkmode_t(lpa, val);
+	}
+
+	return 0;
+}
+
+/**
+ * genphy_c45_read_eee_cap1 - read supported EEE link modes from register 3.20
+ * @phydev: target phy_device struct
+ */
+static int genphy_c45_read_eee_cap1(struct phy_device *phydev)
+{
+	int val;
+
+	/* IEEE 802.3-2018 45.2.3.10 EEE control and capability 1
+	 * (Register 3.20)
+	 */
+	val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
+	if (val < 0)
+		return val;
+
+	/* The 802.3 2018 standard says the top 2 bits are reserved and should
+	 * read as 0. Also, it seems unlikely anybody will build a PHY which
+	 * supports 100GBASE-R deep sleep all the way down to 100BASE-TX EEE.
+	 * If MDIO_PCS_EEE_ABLE is 0xffff assume EEE is not supported.
+	 */
+	if (val == 0xffff)
+		return 0;
+
+	mii_eee_cap1_mod_linkmode_t(phydev->supported_eee, val);
+
+	/* Some buggy devices indicate EEE link modes in MDIO_PCS_EEE_ABLE
+	 * which they don't support as indicated by BMSR, ESTATUS etc.
+	 */
+	linkmode_and(phydev->supported_eee, phydev->supported_eee,
+		     phydev->supported);
+
+	return 0;
+}
+
+/**
+ * genphy_c45_read_eee_abilities - read supported EEE link modes
+ * @phydev: target phy_device struct
+ */
+int genphy_c45_read_eee_abilities(struct phy_device *phydev)
+{
+	int val;
+
+	/* There is not indicator whether optional register
+	 * "EEE control and capability 1" (3.20) is supported. Read it only
+	 * on devices with appropriate linkmodes.
+	 */
+	if (linkmode_intersects(phydev->supported, PHY_EEE_CAP1_FEATURES)) {
+		val = genphy_c45_read_eee_cap1(phydev);
+		if (val)
+			return val;
+	}
+
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT,
+			      phydev->supported)) {
+		/* IEEE 802.3cg-2019 45.2.1.186b 10BASE-T1L PMA status register
+		 * (Register 1.2295)
+		 */
+		val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_10T1L_STAT);
+		if (val < 0)
+			return val;
+
+		linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT,
+				 phydev->supported_eee,
+				 val & MDIO_PMA_10T1L_STAT_EEE);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(genphy_c45_read_eee_abilities);
+
+/**
  * genphy_c45_pma_read_abilities - read supported link modes from PMA
  * @phydev: target phy_device struct
  *
@@ -775,6 +972,11 @@ int genphy_c45_pma_read_abilities(struct phy_device *phydev)
 		}
 	}
 
+	/* This is optional functionality. If not supported, we may get an error
+	 * which should be ignored.
+	 */
+	genphy_c45_read_eee_abilities(phydev);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(genphy_c45_pma_read_abilities);
@@ -1124,6 +1326,121 @@ int genphy_c45_plca_get_status(struct phy_device *phydev,
 }
 EXPORT_SYMBOL_GPL(genphy_c45_plca_get_status);
 
+/**
+ * genphy_c45_eee_is_active - get EEE status
+ * @phydev: target phy_device struct
+ * @adv: variable to store advertised linkmodes
+ * @lp: variable to store LP advertised linkmodes
+ * @is_enabled: variable to store EEE enabled/disabled configuration value
+ *
+ * Description: this function will read local and link partner PHY
+ * advertisements. Compare them return current EEE state.
+ */
+int genphy_c45_eee_is_active(struct phy_device *phydev, unsigned long *adv,
+			     unsigned long *lp, bool *is_enabled)
+{
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(tmp_adv) = {};
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(tmp_lp) = {};
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(common);
+	bool eee_enabled, eee_active;
+	int ret;
+
+	ret = genphy_c45_read_eee_adv(phydev, tmp_adv);
+	if (ret)
+		return ret;
+
+	ret = genphy_c45_read_eee_lpa(phydev, tmp_lp);
+	if (ret)
+		return ret;
+
+	eee_enabled = !linkmode_empty(tmp_adv);
+	linkmode_and(common, tmp_adv, tmp_lp);
+	if (eee_enabled && !linkmode_empty(common))
+		eee_active = phy_check_valid(phydev->speed, phydev->duplex,
+					     common);
+	else
+		eee_active = false;
+
+	if (adv)
+		linkmode_copy(adv, tmp_adv);
+	if (lp)
+		linkmode_copy(lp, tmp_lp);
+	if (is_enabled)
+		*is_enabled = eee_enabled;
+
+	return eee_active;
+}
+EXPORT_SYMBOL(genphy_c45_eee_is_active);
+
+/**
+ * genphy_c45_ethtool_get_eee - get EEE supported and status
+ * @phydev: target phy_device struct
+ * @data: ethtool_eee data
+ *
+ * Description: it reports the Supported/Advertisement/LP Advertisement
+ * capabilities.
+ */
+int genphy_c45_ethtool_get_eee(struct phy_device *phydev,
+			       struct ethtool_eee *data)
+{
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(adv) = {};
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(lp) = {};
+	bool overflow = false, is_enabled;
+	int ret;
+
+	ret = genphy_c45_eee_is_active(phydev, adv, lp, &is_enabled);
+	if (ret < 0)
+		return ret;
+
+	data->eee_enabled = is_enabled;
+	data->eee_active = ret;
+
+	if (!ethtool_convert_link_mode_to_legacy_u32(&data->supported,
+						     phydev->supported_eee))
+		overflow = true;
+	if (!ethtool_convert_link_mode_to_legacy_u32(&data->advertised, adv))
+		overflow = true;
+	if (!ethtool_convert_link_mode_to_legacy_u32(&data->lp_advertised, lp))
+		overflow = true;
+
+	if (overflow)
+		phydev_warn(phydev, "Not all supported or advertised EEE link modes were passed to the user space\n");
+
+	return 0;
+}
+EXPORT_SYMBOL(genphy_c45_ethtool_get_eee);
+
+/**
+ * genphy_c45_ethtool_set_eee - get EEE supported and status
+ * @phydev: target phy_device struct
+ * @data: ethtool_eee data
+ *
+ * Description: it reportes the Supported/Advertisement/LP Advertisement
+ * capabilities.
+ */
+int genphy_c45_ethtool_set_eee(struct phy_device *phydev,
+			       struct ethtool_eee *data)
+{
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(adv) = {};
+	int ret;
+
+	if (data->eee_enabled) {
+		if (data->advertised)
+			adv[0] = data->advertised;
+		else
+			linkmode_copy(adv, phydev->supported_eee);
+	}
+
+	ret = genphy_c45_write_eee_adv(phydev, adv);
+	if (ret < 0)
+		return ret;
+	if (ret > 0)
+		return phy_restart_aneg(phydev);
+
+	return 0;
+}
+EXPORT_SYMBOL(genphy_c45_ethtool_set_eee);
+
 struct phy_driver genphy_c45_driver = {
 	.phy_id         = 0xffffffff,
 	.phy_id_mask    = 0xffffffff,
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 3378ca4f49b6..2f1041a7211e 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -242,11 +242,11 @@ unsigned int phy_supported_speeds(struct phy_device *phy,
  *
  * Description: Returns true if there is a valid setting, false otherwise.
  */
-static inline bool phy_check_valid(int speed, int duplex,
-				   unsigned long *features)
+bool phy_check_valid(int speed, int duplex, unsigned long *features)
 {
 	return !!phy_lookup_setting(speed, duplex, features, true);
 }
+EXPORT_SYMBOL(phy_check_valid);
 
 /**
  * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
@@ -1457,30 +1457,6 @@ void phy_mac_interrupt(struct phy_device *phydev)
 }
 EXPORT_SYMBOL(phy_mac_interrupt);
 
-static void mmd_eee_adv_to_linkmode(unsigned long *advertising, u16 eee_adv)
-{
-	linkmode_zero(advertising);
-
-	if (eee_adv & MDIO_EEE_100TX)
-		linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
-				 advertising);
-	if (eee_adv & MDIO_EEE_1000T)
-		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
-				 advertising);
-	if (eee_adv & MDIO_EEE_10GT)
-		linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
-				 advertising);
-	if (eee_adv & MDIO_EEE_1000KX)
-		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
-				 advertising);
-	if (eee_adv & MDIO_EEE_10GKX4)
-		linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
-				 advertising);
-	if (eee_adv & MDIO_EEE_10GKR)
-		linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
-				 advertising);
-}
-
 /**
  * phy_init_eee - init and check the EEE feature
  * @phydev: target phy_device struct
@@ -1493,62 +1469,25 @@ static void mmd_eee_adv_to_linkmode(unsigned long *advertising, u16 eee_adv)
  */
 int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable)
 {
+	int ret;
+
 	if (!phydev->drv)
 		return -EIO;
 
-	/* According to 802.3az,the EEE is supported only in full duplex-mode.
-	 */
-	if (phydev->duplex == DUPLEX_FULL) {
-		__ETHTOOL_DECLARE_LINK_MODE_MASK(common);
-		__ETHTOOL_DECLARE_LINK_MODE_MASK(lp);
-		__ETHTOOL_DECLARE_LINK_MODE_MASK(adv);
-		int eee_lp, eee_cap, eee_adv;
-		int status;
-		u32 cap;
-
-		/* Read phy status to properly get the right settings */
-		status = phy_read_status(phydev);
-		if (status)
-			return status;
-
-		/* First check if the EEE ability is supported */
-		eee_cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
-		if (eee_cap <= 0)
-			goto eee_exit_err;
-
-		cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap);
-		if (!cap)
-			goto eee_exit_err;
-
-		/* Check which link settings negotiated and verify it in
-		 * the EEE advertising registers.
-		 */
-		eee_lp = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
-		if (eee_lp <= 0)
-			goto eee_exit_err;
-
-		eee_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
-		if (eee_adv <= 0)
-			goto eee_exit_err;
-
-		mmd_eee_adv_to_linkmode(adv, eee_adv);
-		mmd_eee_adv_to_linkmode(lp, eee_lp);
-		linkmode_and(common, adv, lp);
-
-		if (!phy_check_valid(phydev->speed, phydev->duplex, common))
-			goto eee_exit_err;
+	ret = genphy_c45_eee_is_active(phydev, NULL, NULL, NULL);
+	if (ret < 0)
+		return ret;
+	if (!ret)
+		return -EPROTONOSUPPORT;
 
-		if (clk_stop_enable)
-			/* Configure the PHY to stop receiving xMII
-			 * clock while it is signaling LPI.
-			 */
-			phy_set_bits_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1,
-					 MDIO_PCS_CTRL1_CLKSTOP_EN);
+	if (clk_stop_enable)
+		/* Configure the PHY to stop receiving xMII
+		 * clock while it is signaling LPI.
+		 */
+		ret = phy_set_bits_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1,
+				       MDIO_PCS_CTRL1_CLKSTOP_EN);
 
-		return 0; /* EEE supported */
-	}
-eee_exit_err:
-	return -EPROTONOSUPPORT;
+	return ret < 0 ? ret : 0;
 }
 EXPORT_SYMBOL(phy_init_eee);
 
@@ -1578,33 +1517,10 @@ EXPORT_SYMBOL(phy_get_eee_err);
  */
 int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
 {
-	int val;
-
 	if (!phydev->drv)
 		return -EIO;
 
-	/* Get Supported EEE */
-	val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
-	if (val < 0)
-		return val;
-	data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
-
-	/* Get advertisement EEE */
-	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
-	if (val < 0)
-		return val;
-	data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
-	data->eee_enabled = !!data->advertised;
-
-	/* Get LP advertisement EEE */
-	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE);
-	if (val < 0)
-		return val;
-	data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val);
-
-	data->eee_active = !!(data->advertised & data->lp_advertised);
-
-	return 0;
+	return genphy_c45_ethtool_get_eee(phydev, data);
 }
 EXPORT_SYMBOL(phy_ethtool_get_eee);
 
@@ -1617,43 +1533,10 @@ EXPORT_SYMBOL(phy_ethtool_get_eee);
  */
 int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
 {
-	int cap, old_adv, adv = 0, ret;
-
 	if (!phydev->drv)
 		return -EIO;
 
-	/* Get Supported EEE */
-	cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
-	if (cap < 0)
-		return cap;
-
-	old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
-	if (old_adv < 0)
-		return old_adv;
-
-	if (data->eee_enabled) {
-		adv = !data->advertised ? cap :
-		      ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;
-		/* Mask prohibited EEE modes */
-		adv &= ~phydev->eee_broken_modes;
-	}
-
-	if (old_adv != adv) {
-		ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
-		if (ret < 0)
-			return ret;
-
-		/* Restart autonegotiation so the new modes get sent to the
-		 * link partner.
-		 */
-		if (phydev->autoneg == AUTONEG_ENABLE) {
-			ret = phy_restart_aneg(phydev);
-			if (ret < 0)
-				return ret;
-		}
-	}
-
-	return 0;
+	return genphy_c45_ethtool_set_eee(phydev, data);
 }
 EXPORT_SYMBOL(phy_ethtool_set_eee);
 
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index a3917c7acbd3..8d927c5e3bf8 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -132,6 +132,18 @@ static const int phy_10gbit_full_features_array[] = {
 	ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
 };
 
+static const int phy_eee_cap1_features_array[] = {
+	ETHTOOL_LINK_MODE_100baseT_Full_BIT,
+	ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
+	ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
+	ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
+	ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
+	ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
+};
+
+__ETHTOOL_DECLARE_LINK_MODE_MASK(phy_eee_cap1_features) __ro_after_init;
+EXPORT_SYMBOL_GPL(phy_eee_cap1_features);
+
 static void features_init(void)
 {
 	/* 10/100 half/full*/
@@ -213,6 +225,10 @@ static void features_init(void)
 	linkmode_set_bit_array(phy_10gbit_fec_features_array,
 			       ARRAY_SIZE(phy_10gbit_fec_features_array),
 			       phy_10gbit_fec_features);
+	linkmode_set_bit_array(phy_eee_cap1_features_array,
+			       ARRAY_SIZE(phy_eee_cap1_features_array),
+			       phy_eee_cap1_features);
+
 }
 
 void phy_device_free(struct phy_device *phydev)
@@ -2215,7 +2231,10 @@ int __genphy_config_aneg(struct phy_device *phydev, bool changed)
 {
 	int err;
 
-	if (genphy_config_eee_advert(phydev))
+	err = genphy_c45_write_eee_adv(phydev, phydev->supported_eee);
+	if (err < 0)
+		return err;
+	else if (err)
 		changed = true;
 
 	err = genphy_setup_master_slave(phydev);
@@ -2637,6 +2656,11 @@ int genphy_read_abilities(struct phy_device *phydev)
 				 phydev->supported, val & ESTATUS_1000_XFULL);
 	}
 
+	/* This is optional functionality. If not supported, we may get an error
+	 * which should be ignored.
+	 */
+	genphy_c45_read_eee_abilities(phydev);
+
 	return 0;
 }
 EXPORT_SYMBOL(genphy_read_abilities);
diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index c0da30d63b1d..27013d6bf24a 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -402,6 +402,90 @@ static inline u32 linkmode_adv_to_mii_t1_adv_m_t(unsigned long *advertising)
 	return result;
 }
 
+/**
+ * mii_eee_cap1_mod_linkmode_t()
+ * @adv: target the linkmode advertisement settings
+ * @val: register value
+ *
+ * A function that translates value of following registers to the linkmode:
+ * IEEE 802.3-2018 45.2.3.10 "EEE control and capability 1" register (3.20)
+ * IEEE 802.3-2018 45.2.7.13 "EEE advertisement 1" register (7.60)
+ * IEEE 802.3-2018 45.2.7.14 "EEE "link partner ability 1 register (7.61)
+ */
+static inline void mii_eee_cap1_mod_linkmode_t(unsigned long *adv, u32 val)
+{
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
+			 adv, val & MDIO_EEE_100TX);
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
+			 adv, val & MDIO_EEE_1000T);
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
+			 adv, val & MDIO_EEE_10GT);
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
+			 adv, val & MDIO_EEE_1000KX);
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
+			 adv, val & MDIO_EEE_10GKX4);
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
+			 adv, val & MDIO_EEE_10GKR);
+}
+
+/**
+ * linkmode_to_mii_eee_cap1_t()
+ * @adv: the linkmode advertisement settings
+ *
+ * A function that translates linkmode to value for IEEE 802.3-2018 45.2.7.13
+ * "EEE advertisement 1" register (7.60)
+ */
+static inline u32 linkmode_to_mii_eee_cap1_t(unsigned long *adv)
+{
+	u32 result = 0;
+
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, adv))
+		result |= MDIO_EEE_100TX;
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, adv))
+		result |= MDIO_EEE_1000T;
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT, adv))
+		result |= MDIO_EEE_10GT;
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT, adv))
+		result |= MDIO_EEE_1000KX;
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT, adv))
+		result |= MDIO_EEE_10GKX4;
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT, adv))
+		result |= MDIO_EEE_10GKR;
+
+	return result;
+}
+
+/**
+ * mii_10base_t1_adv_mod_linkmode_t()
+ * @adv: linkmode advertisement settings
+ * @val: register value
+ *
+ * A function that translates IEEE 802.3cg-2019 45.2.7.26 "10BASE-T1 AN status"
+ * register (7.527) value to the linkmode.
+ */
+static inline void mii_10base_t1_adv_mod_linkmode_t(unsigned long *adv, u16 val)
+{
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT,
+			 adv, val & MDIO_AN_10BT1_AN_CTRL_ADV_EEE_T1L);
+}
+
+/**
+ * linkmode_adv_to_mii_10base_t1_t()
+ * @adv: linkmode advertisement settings
+ *
+ * A function that translates the linkmode to IEEE 802.3cg-2019 45.2.7.25
+ * "10BASE-T1 AN control" register (7.526) value.
+ */
+static inline u32 linkmode_adv_to_mii_10base_t1_t(unsigned long *adv)
+{
+	u32 result = 0;
+
+	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT, adv))
+		result |= MDIO_AN_10BT1_AN_CTRL_ADV_EEE_T1L;
+
+	return result;
+}
+
 int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
 int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
 int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,
diff --git a/include/linux/phy.h b/include/linux/phy.h
index fbeba4fee8d4..727bff531a14 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -52,6 +52,7 @@ extern __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_gbit_all_ports_features) __ro_after_
 extern __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_10gbit_features) __ro_after_init;
 extern __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_10gbit_fec_features) __ro_after_init;
 extern __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_10gbit_full_features) __ro_after_init;
+extern __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_eee_cap1_features) __ro_after_init;
 
 #define PHY_BASIC_FEATURES ((unsigned long *)&phy_basic_features)
 #define PHY_BASIC_T1_FEATURES ((unsigned long *)&phy_basic_t1_features)
@@ -62,6 +63,7 @@ extern __ETHTOOL_DECLARE_LINK_MODE_MASK(phy_10gbit_full_features) __ro_after_ini
 #define PHY_10GBIT_FEATURES ((unsigned long *)&phy_10gbit_features)
 #define PHY_10GBIT_FEC_FEATURES ((unsigned long *)&phy_10gbit_fec_features)
 #define PHY_10GBIT_FULL_FEATURES ((unsigned long *)&phy_10gbit_full_features)
+#define PHY_EEE_CAP1_FEATURES ((unsigned long *)&phy_eee_cap1_features)
 
 extern const int phy_basic_ports_array[3];
 extern const int phy_fibre_port_array[1];
@@ -572,6 +574,7 @@ struct macsec_ops;
  * @supported: Combined MAC/PHY supported linkmodes
  * @advertising: Currently advertised linkmodes
  * @adv_old: Saved advertised while power saving for WoL
+ * @supported_eee: supported PHY EEE linkmodes
  * @lp_advertising: Current link partner advertised linkmodes
  * @host_interfaces: PHY interface modes supported by host
  * @eee_broken_modes: Energy efficient ethernet modes which should be prohibited
@@ -676,6 +679,8 @@ struct phy_device {
 	__ETHTOOL_DECLARE_LINK_MODE_MASK(lp_advertising);
 	/* used with phy_speed_down */
 	__ETHTOOL_DECLARE_LINK_MODE_MASK(adv_old);
+	/* used for eee validation */
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(supported_eee);
 
 	/* Host supported PHY interface types. Should be ignored if empty. */
 	DECLARE_PHY_INTERFACE_MASK(host_interfaces);
@@ -1614,6 +1619,7 @@ 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);
 int phy_speed_up(struct phy_device *phydev);
+bool phy_check_valid(int speed, int duplex, unsigned long *features);
 
 int phy_restart_aneg(struct phy_device *phydev);
 int phy_reset_after_clk_enable(struct phy_device *phydev);
@@ -1737,6 +1743,7 @@ int genphy_c45_an_config_aneg(struct phy_device *phydev);
 int genphy_c45_an_disable_aneg(struct phy_device *phydev);
 int genphy_c45_read_mdix(struct phy_device *phydev);
 int genphy_c45_pma_read_abilities(struct phy_device *phydev);
+int genphy_c45_read_eee_abilities(struct phy_device *phydev);
 int genphy_c45_pma_baset1_read_master_slave(struct phy_device *phydev);
 int genphy_c45_read_status(struct phy_device *phydev);
 int genphy_c45_baset1_read_status(struct phy_device *phydev);
@@ -1751,6 +1758,13 @@ int genphy_c45_plca_set_cfg(struct phy_device *phydev,
 			    const struct phy_plca_cfg *plca_cfg);
 int genphy_c45_plca_get_status(struct phy_device *phydev,
 			       struct phy_plca_status *plca_st);
+int genphy_c45_eee_is_active(struct phy_device *phydev, unsigned long *adv,
+			     unsigned long *lp, bool *is_enabled);
+int genphy_c45_ethtool_get_eee(struct phy_device *phydev,
+			       struct ethtool_eee *data);
+int genphy_c45_ethtool_set_eee(struct phy_device *phydev,
+			       struct ethtool_eee *data);
+int genphy_c45_write_eee_adv(struct phy_device *phydev, unsigned long *adv);
 
 /* Generic C45 PHY driver */
 extern struct phy_driver genphy_c45_driver;
diff --git a/include/uapi/linux/mdio.h b/include/uapi/linux/mdio.h
index 75b7257a51e1..256b463e47a6 100644
--- a/include/uapi/linux/mdio.h
+++ b/include/uapi/linux/mdio.h
@@ -79,6 +79,8 @@
 #define MDIO_AN_T1_LP_L		517	/* BASE-T1 AN LP Base Page ability register [15:0] */
 #define MDIO_AN_T1_LP_M		518	/* BASE-T1 AN LP Base Page ability register [31:16] */
 #define MDIO_AN_T1_LP_H		519	/* BASE-T1 AN LP Base Page ability register [47:32] */
+#define MDIO_AN_10BT1_AN_CTRL	526	/* 10BASE-T1 AN control register */
+#define MDIO_AN_10BT1_AN_STAT	527	/* 10BASE-T1 AN status register */
 #define MDIO_PMA_PMD_BT1_CTRL	2100	/* BASE-T1 PMA/PMD control register */
 
 /* LASI (Link Alarm Status Interrupt) registers, defined by XENPAK MSA. */
@@ -340,6 +342,12 @@
 #define MDIO_AN_T1_LP_H_10L_TX_HI_REQ	0x1000	/* 10BASE-T1L High Level LP Transmit Request */
 #define MDIO_AN_T1_LP_H_10L_TX_HI	0x2000	/* 10BASE-T1L High Level LP Transmit Ability */
 
+/* 10BASE-T1 AN control register */
+#define MDIO_AN_10BT1_AN_CTRL_ADV_EEE_T1L	0x4000 /* 10BASE-T1L EEE ability advertisement */
+
+/* 10BASE-T1 AN status register */
+#define MDIO_AN_10BT1_AN_STAT_LPA_EEE_T1L	0x4000 /* 10BASE-T1L LP EEE ability advertisement */
+
 /* BASE-T1 PMA/PMD control register */
 #define MDIO_PMA_PMD_BT1_CTRL_CFG_MST	0x4000 /* MASTER-SLAVE config value */