linux-kernel - [PATCH net v1 1/1] net: dsa: microchip: make sure drive strength configuration is not lost by soft reset

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Date: Mon,  4 Mar 2024 14:56:12 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: "David S. Miller" <davem@...emloft.net>,
	Andrew Lunn <andrew@...n.ch>,
	Eric Dumazet <edumazet@...gle.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Vladimir Oltean <olteanv@...il.com>,
	Woojung Huh <woojung.huh@...rochip.com>,
	Arun Ramadoss <arun.ramadoss@...rochip.com>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>,
	kernel@...gutronix.de,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	UNGLinuxDriver@...rochip.com
Subject: [PATCH net v1 1/1] net: dsa: microchip: make sure drive strength configuration is not lost by soft reset

This driver has two separate reset sequence in different places:
- gpio/HW reset on start of ksz_switch_register()
- SW reset on start of ksz_setup()

The second one will overwrite drive strength configuration made in the
ksz_switch_register().

To fix it, move ksz_parse_drive_strength() from ksz_switch_register() to
ksz_setup().

Fixes: d67d7247f641 ("net: dsa: microchip: Add drive strength configuration")
Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/net/dsa/microchip/ksz_common.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index d58cc685478b1..83a5936506059 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2260,6 +2260,8 @@ static int ksz_pirq_setup(struct ksz_device *dev, u8 p)
 	return ksz_irq_common_setup(dev, pirq);
 }
 
+static int ksz_parse_drive_strength(struct ksz_device *dev);
+
 static int ksz_setup(struct dsa_switch *ds)
 {
 	struct ksz_device *dev = ds->priv;
@@ -2281,6 +2283,10 @@ static int ksz_setup(struct dsa_switch *ds)
 		return ret;
 	}
 
+	ret = ksz_parse_drive_strength(dev);
+	if (ret)
+		return ret;
+
 	/* set broadcast storm protection 10% rate */
 	regmap_update_bits(ksz_regmap_16(dev), regs[S_BROADCAST_CTRL],
 			   BROADCAST_STORM_RATE,
@@ -4345,10 +4351,6 @@ int ksz_switch_register(struct ksz_device *dev)
 	for (port_num = 0; port_num < dev->info->port_cnt; ++port_num)
 		dev->ports[port_num].interface = PHY_INTERFACE_MODE_NA;
 	if (dev->dev->of_node) {
-		ret = ksz_parse_drive_strength(dev);
-		if (ret)
-			return ret;
-
 		ret = of_get_phy_mode(dev->dev->of_node, &interface);
 		if (ret == 0)
 			dev->compat_interface = interface;
-- 
2.39.2