linux-kernel - [PATCH stable 6.1 1/4] net: bcmgenet: Clear RGMII

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Date: Wed, 15 May 2024 10:02:24 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: linux-kernel@...r.kernel.org
Cc: broonie@...nel.org,
	Florian Fainelli <f.fainelli@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Doug Berger <opendmb@...il.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org (open list:BROADCOM GENET ETHERNET DRIVER),
	stable@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH stable 6.1 1/4] net: bcmgenet: Clear RGMII_LINK upon link down

From: Florian Fainelli <f.fainelli@...il.com>

commit 696450c05181559a35d4d5bee55c465b1ac6fe2e upstream

Clear the RGMII_LINK bit upon detecting link down to be consistent with
setting the bit upon link up. We also move the clearing of the
out-of-band disable to the runtime initialization rather than for each
link up/down transition.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Link: https://lore.kernel.org/r/20221118213754.1383364-1-f.fainelli@gmail.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>
---
 drivers/net/ethernet/broadcom/genet/bcmmii.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 1779ee524dac..cc3afb605b1e 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -72,7 +72,6 @@ static void bcmgenet_mac_config(struct net_device *dev)
 	 * Receive clock is provided by the PHY.
 	 */
 	reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
-	reg &= ~OOB_DISABLE;
 	reg |= RGMII_LINK;
 	bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
 
@@ -100,10 +99,18 @@ static void bcmgenet_mac_config(struct net_device *dev)
  */
 void bcmgenet_mii_setup(struct net_device *dev)
 {
+	struct bcmgenet_priv *priv = netdev_priv(dev);
 	struct phy_device *phydev = dev->phydev;
+	u32 reg;
 
-	if (phydev->link)
+	if (phydev->link) {
 		bcmgenet_mac_config(dev);
+	} else {
+		reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
+		reg &= ~RGMII_LINK;
+		bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
+	}
+
 	phy_print_status(phydev);
 }
 
@@ -264,18 +271,20 @@ int bcmgenet_mii_config(struct net_device *dev, bool init)
 			(priv->phy_interface != PHY_INTERFACE_MODE_MOCA);
 
 	/* This is an external PHY (xMII), so we need to enable the RGMII
-	 * block for the interface to work
+	 * block for the interface to work, unconditionally clear the
+	 * Out-of-band disable since we do not need it.
 	 */
+	reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
+	reg &= ~OOB_DISABLE;
 	if (priv->ext_phy) {
-		reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
 		reg &= ~ID_MODE_DIS;
 		reg |= id_mode_dis;
 		if (GENET_IS_V1(priv) || GENET_IS_V2(priv) || GENET_IS_V3(priv))
 			reg |= RGMII_MODE_EN_V123;
 		else
 			reg |= RGMII_MODE_EN;
-		bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
 	}
+	bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
 
 	if (init)
 		dev_info(kdev, "configuring instance for %s\n", phy_name);
-- 
2.34.1