net: phy: micrel: lan8814 led errata

Lan8814 phy led behavior is not correct. It was noticed that the led
still remains ON when the cable is unplugged while there was traffic
passing at that time.

The fix consists in clearing bit 10 of register 0x38, in this way the
led behaviour is correct and gets OFF when there is no link.

Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20240304091548.1386022-2-horatiu.vultur@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 9b6973581989662a4ba1ffe29ae599f23ae89669..88cc03982bb78af02739f66c729269dff8387d77 100644 (file)
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -114,6 +114,9 @@
 #define LAN8814_INTR_CTRL_REG_POLARITY         BIT(1)
 #define LAN8814_INTR_CTRL_REG_INTR_ENABLE      BIT(0)
 
+#define LAN8814_EEE_STATE                      0x38
+#define LAN8814_EEE_STATE_MASK2P5P             BIT(10)
+
 /* Represents 1ppm adjustment in 2^32 format with
  * each nsec contains 4 clock cycles.
  * The value is calculated as following: (1/1000000)/((2^-32)/4)
@@ -3288,6 +3291,19 @@ static int lan8814_release_coma_mode(struct phy_device *phydev)
        return 0;
 }
 
+static void lan8814_clear_2psp_bit(struct phy_device *phydev)
+{
+       u16 val;
+
+       /* It was noticed that when traffic is passing through the PHY and the
+        * cable is removed then the LED was still one even though there is no
+        * link
+        */
+       val = lanphy_read_page_reg(phydev, 2, LAN8814_EEE_STATE);
+       val &= ~LAN8814_EEE_STATE_MASK2P5P;
+       lanphy_write_page_reg(phydev, 2, LAN8814_EEE_STATE, val);
+}
+
 static int lan8814_probe(struct phy_device *phydev)
 {
        const struct kszphy_type *type = phydev->drv->driver_data;
@@ -3324,6 +3340,9 @@ static int lan8814_probe(struct phy_device *phydev)
 
        lan8814_ptp_init(phydev);
 
+       /* Errata workarounds */
+       lan8814_clear_2psp_bit(phydev);
+
        return 0;
 }