[PATCH net v1 1/2] net: phy: Introduce phy_update_eee() to update eee_cfg values

[Choong Yong Liang <yong.liang.choong@linux.intel.com>]

The commit fe0d4fd9285e ("net: phy: Keep track of EEE configuration")
introduced eee_cfg, which is used to check the existing settings against
the requested changes. When the 'ethtool --show-eee' command is issued,
it reads the values from eee_cfg. However, the 'show-eee' command does
not show the correct result after system boot-up, link up, and link down.

For system boot-up, the commit 49168d1980e2
("net: phy: Add phy_support_eee() indicating MAC support EEE") introduced
phy_support_eee to set eee_cfg as the default value. However, the values
set were not always correct, as after autonegotiation or speed changes,
the selected speed might not be supported by EEE.

phy_update_eee() was introduced to update the correct values for eee_cfg
during link up and down, ensuring that 'ethtool --show-eee' shows
the correct status.

Fixes: fe0d4fd9285e ("net: phy: Keep track of EEE configuration")
Cc: <stable@vger.kernel.org>
Signed-off-by: Choong Yong Liang <yong.liang.choong@linux.intel.com>
---
 drivers/net/phy/phy_device.c | 24 ++++++++++++++++++++++++
 include/linux/phy.h          |  2 ++
 2 files changed, 26 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 499797646580..94dadf011ca6 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -3016,6 +3016,30 @@ void phy_support_eee(struct phy_device *phydev)
 }
 EXPORT_SYMBOL(phy_support_eee);
 
+/**
+ * phy_update_eee - Update the Energy Efficient Ethernet (EEE) settings
+ * @phydev: target phy_device struct
+ * @tx_lpi_enabled: boolean indicating if Low Power Idle (LPI) for
+ * transmission is enabled.
+ * @eee_enabled: boolean indicating if Energy Efficient Ethernet (EEE) is
+ * enabled.
+ * @tx_lpi_timer: the Low Power Idle (LPI) timer value (in microseconds) for
+ * transmission.
+ *
+ * Description:
+ * This function updates the Energy Efficient Ethernet (EEE) settings for the
+ * specified PHY device. It is typically called during link up and down events
+ * to configure the EEE parameters according to the current link state.
+ */
+void phy_update_eee(struct phy_device *phydev, bool tx_lpi_enabled,
+		    bool eee_enabled, u32 tx_lpi_timer)
+{
+	phydev->eee_cfg.tx_lpi_enabled = tx_lpi_enabled;
+	phydev->eee_cfg.eee_enabled = eee_enabled;
+	phydev->eee_cfg.tx_lpi_timer = tx_lpi_timer;
+}
+EXPORT_SYMBOL(phy_update_eee);
+
 /**
  * phy_support_sym_pause - Enable support of symmetrical pause
  * @phydev: target phy_device struct
diff --git a/include/linux/phy.h b/include/linux/phy.h
index a98bc91a0cde..6c300ba47a2d 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -2004,6 +2004,8 @@ void phy_advertise_eee_all(struct phy_device *phydev);
 void phy_support_sym_pause(struct phy_device *phydev);
 void phy_support_asym_pause(struct phy_device *phydev);
 void phy_support_eee(struct phy_device *phydev);
+void phy_update_eee(struct phy_device *phydev, bool tx_lpi_enabled,
+		    bool eee_enabled, u32 tx_lpi_timer);
 void phy_set_sym_pause(struct phy_device *phydev, bool rx, bool tx,
 		       bool autoneg);
 void phy_set_asym_pause(struct phy_device *phydev, bool rx, bool tx);
-- 
2.34.1