openwrt/target/linux/bcm27xx/patches-5.15/950-0055-lan78xx-Enable-LEDs-and-auto-negotiation.patch

From ec6fe1f3510a68ea742758b1cd806a5a08fed7ae Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 17 Oct 2017 15:04:29 +0100
Subject: [PATCH] lan78xx: Enable LEDs and auto-negotiation

For applications of the LAN78xx that don't have valid programmed
EEPROMs or OTPs, enabling both LEDs and auto-negotiation by default
seems reasonable.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 drivers/net/usb/lan78xx.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -2716,6 +2716,11 @@ static int lan78xx_reset(struct lan78xx_
 	int ret;
 	u32 buf;
 	u8 sig;
+	bool has_eeprom;
+	bool has_otp;
+
+	has_eeprom = !lan78xx_read_eeprom(dev, 0, 0, NULL);
+	has_otp = !lan78xx_read_otp(dev, 0, 0, NULL);
 
 	ret = lan78xx_read_reg(dev, HW_CFG, &buf);
 	if (ret < 0)
@@ -2797,6 +2802,10 @@ static int lan78xx_reset(struct lan78xx_
 
 	buf |= HW_CFG_MEF_;
 
+	/* If no valid EEPROM and no valid OTP, enable the LEDs by default */
+	if (!has_eeprom && !has_otp)
+	    buf |= HW_CFG_LED0_EN_ | HW_CFG_LED1_EN_;
+
 	ret = lan78xx_write_reg(dev, HW_CFG, buf);
 	if (ret < 0)
 		return ret;
@@ -2895,6 +2904,9 @@ static int lan78xx_reset(struct lan78xx_
 			buf |= MAC_CR_AUTO_DUPLEX_ | MAC_CR_AUTO_SPEED_;
 		}
 	}
+	/* If no valid EEPROM and no valid OTP, enable AUTO negotiation */
+	if (!has_eeprom && !has_otp)
+	    buf |= MAC_CR_AUTO_DUPLEX_ | MAC_CR_AUTO_SPEED_;
 	ret = lan78xx_write_reg(dev, MAC_CR, buf);
 	if (ret < 0)
 		return ret;