change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/drivers/net/phy/microchip.c
..
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@@ -326,6 +326,37 @@
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 	return genphy_config_aneg(phydev);
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 }
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+static void lan88xx_link_change_notify(struct phy_device *phydev)
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+{
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+	int temp;
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+
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+	/* At forced 100 F/H mode, chip may fail to set mode correctly
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+	 * when cable is switched between long(~50+m) and short one.
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+	 * As workaround, set to 10 before setting to 100
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+	 * at forced 100 F/H mode.
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+	 */
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+	if (!phydev->autoneg && phydev->speed == 100) {
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+		/* disable phy interrupt */
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+		temp = phy_read(phydev, LAN88XX_INT_MASK);
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+		temp &= ~LAN88XX_INT_MASK_MDINTPIN_EN_;
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+		phy_write(phydev, LAN88XX_INT_MASK, temp);
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+
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+		temp = phy_read(phydev, MII_BMCR);
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+		temp &= ~(BMCR_SPEED100 | BMCR_SPEED1000);
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+		phy_write(phydev, MII_BMCR, temp); /* set to 10 first */
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+		temp |= BMCR_SPEED100;
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+		phy_write(phydev, MII_BMCR, temp); /* set to 100 later */
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+
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+		/* clear pending interrupt generated while workaround */
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+		temp = phy_read(phydev, LAN88XX_INT_STS);
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+
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+		/* enable phy interrupt back */
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+		temp = phy_read(phydev, LAN88XX_INT_MASK);
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+		temp |= LAN88XX_INT_MASK_MDINTPIN_EN_;
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+		phy_write(phydev, LAN88XX_INT_MASK, temp);
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+	}
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+}
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+
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 static struct phy_driver microchip_phy_driver[] = {
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 {
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 	.phy_id		= 0x0007c130,
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@@ -339,6 +370,7 @@
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 	.config_init	= lan88xx_config_init,
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 	.config_aneg	= lan88xx_config_aneg,
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+	.link_change_notify = lan88xx_link_change_notify,
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 	.ack_interrupt	= lan88xx_phy_ack_interrupt,
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 	.config_intr	= lan88xx_phy_config_intr,