linux-kernel - [PATCH net] net: dsa: microchip: Fix KSZ8863 reset problem

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Message-ID: <20250802002253.5210-1-Tristram.Ha@microchip.com>
Date: Fri, 1 Aug 2025 17:22:53 -0700
From: <Tristram.Ha@...rochip.com>
To: Oleksij Rempel <linux@...pel-privat.de>, Woojung Huh
	<woojung.huh@...rochip.com>, Andrew Lunn <andrew@...n.ch>, Vladimir Oltean
	<olteanv@...il.com>
CC: Maxime Chevallier <maxime.chevallier@...tlin.com>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	<UNGLinuxDriver@...rochip.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Tristram Ha <tristram.ha@...rochip.com>
Subject: [PATCH net] net: dsa: microchip: Fix KSZ8863 reset problem

From: Tristram Ha <tristram.ha@...rochip.com>

ksz8873_valid_regs[] was added for register access for KSZ8863/KSZ8873
switches, but the reset register is not in the list so
ksz8_reset_switch() does not take any effect.

ksz_cfg() is updated to display an error so that there will be a future
check for adding new register access code.

A side effect of not resetting the switch is the static MAC table is not
cleared.  Further additions to the table will show write error as there
are only 8 entries in the table.

Fixes: d0dec3333040 ("net: dsa: microchip: Add register access control for KSZ8873 chip")
Signed-off-by: Tristram Ha <tristram.ha@...rochip.com>
---
 drivers/net/dsa/microchip/ksz8.c       | 7 ++++++-
 drivers/net/dsa/microchip/ksz_common.c | 1 +
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/microchip/ksz8.c b/drivers/net/dsa/microchip/ksz8.c
index 76e490070e9c..6d282a8e3684 100644
--- a/drivers/net/dsa/microchip/ksz8.c
+++ b/drivers/net/dsa/microchip/ksz8.c
@@ -36,7 +36,12 @@
 
 static void ksz_cfg(struct ksz_device *dev, u32 addr, u8 bits, bool set)
 {
-	regmap_update_bits(ksz_regmap_8(dev), addr, bits, set ? bits : 0);
+	int ret;
+
+	ret = regmap_update_bits(ksz_regmap_8(dev), addr, bits, set ? bits : 0);
+	if (ret)
+		dev_err(dev->dev, "can't update reg 0x%x: %pe\n", addr,
+			ERR_PTR(ret));
 }
 
 static void ksz_port_cfg(struct ksz_device *dev, int port, int offset, u8 bits,
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 7292bfe2f7ca..4cb14288ff0f 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -1447,6 +1447,7 @@ static const struct regmap_range ksz8873_valid_regs[] = {
 	regmap_reg_range(0x3f, 0x3f),
 
 	/* advanced control registers */
+	regmap_reg_range(0x43, 0x43),
 	regmap_reg_range(0x60, 0x6f),
 	regmap_reg_range(0x70, 0x75),
 	regmap_reg_range(0x76, 0x78),
-- 
2.34.1