From 0e67899abfbfdea0c3c0ed3fd263ffc601c5c157 Mon Sep 17 00:00:00 2001
From: Oleksij Rempel <o.rempel@pengutronix.de>
Date: Thu, 22 Feb 2024 13:38:38 +0100
Subject: [PATCH] lan78xx: enable auto speed configuration for LAN7850 if no
EEPROM is detected
Git-commit: 0e67899abfbfdea0c3c0ed3fd263ffc601c5c157
References: git-fixes
Patch-mainline: v6.8-rc7
Same as LAN7800, LAN7850 can be used without EEPROM. If EEPROM is not
present or not flashed, LAN7850 will fail to sync the speed detected by the PHY
with the MAC. In case link speed is 100Mbit, it will accidentally work,
otherwise no data can be transferred.
Better way would be to implement link_up callback, or set auto speed
configuration unconditionally. But this changes would be more intrusive.
So, for now, set it only if no EEPROM is found.
Fixes: e69647a19c87 ("lan78xx: Set ASD in MAC_CR when EEE is enabled.")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/r/20240222123839.2816561-1-o.rempel@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
drivers/net/usb/lan78xx.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index a6d653ff552a..e06193e831a5 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -3033,7 +3033,8 @@ static int lan78xx_reset(struct lan78xx_net *dev)
if (dev->chipid == ID_REV_CHIP_ID_7801_)
buf &= ~MAC_CR_GMII_EN_;
- if (dev->chipid == ID_REV_CHIP_ID_7800_) {
+ if (dev->chipid == ID_REV_CHIP_ID_7800_ ||
+ dev->chipid == ID_REV_CHIP_ID_7850_) {
ret = lan78xx_read_raw_eeprom(dev, 0, 1, &sig);
if (!ret && sig != EEPROM_INDICATOR) {
/* Implies there is no external eeprom. Set mac speed */
--
2.44.0