linux-kernel - [PATCH net] net: dpaa: Fix <1G ethernet on LS1046ARDB

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Message-Id: <20220818164029.2063293-1-sean.anderson@seco.com>
Date:   Thu, 18 Aug 2022 12:40:29 -0400
From:   Sean Anderson <sean.anderson@...o.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Cc:     Camelia Alexandra Groza <camelia.groza@....com>,
        linux-kernel@...r.kernel.org, Russell King <linux@...linux.org.uk>,
        Madalin Bucur <madalin.bucur@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Bhadram Varka <vbhadram@...dia.com>,
        Sean Anderson <sean.anderson@...o.com>
Subject: [PATCH net] net: dpaa: Fix <1G ethernet on LS1046ARDB

As discussed in commit 73a21fa817f0 ("dpaa_eth: support all modes with
rate adapting PHYs"), we must add a workaround for Aquantia phys with
in-tree support in order to keep 1G support working. Update this
workaround for the AQR113C phy found on revision C LS1046ARDB boards.

Fixes: 12cf1b89a668 ("net: phy: Add support for AQR113C EPHY")
Signed-off-by: Sean Anderson <sean.anderson@...o.com>
Acked-by: Camelia Groza <camelia.groza@....com>
---
This commit was split off from [1], as it is a bugfix and should go on
net/master.

[1] https://lore.kernel.org/netdev/20220725153730.2604096-1-sean.anderson@seco.com/

 drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index 45634579adb6..a770bab4d1ed 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -2886,6 +2886,7 @@ static void dpaa_adjust_link(struct net_device *net_dev)
 
 /* The Aquantia PHYs are capable of performing rate adaptation */
 #define PHY_VEND_AQUANTIA	0x03a1b400
+#define PHY_VEND_AQUANTIA2	0x31c31c00
 
 static int dpaa_phy_init(struct net_device *net_dev)
 {
@@ -2893,6 +2894,7 @@ static int dpaa_phy_init(struct net_device *net_dev)
 	struct mac_device *mac_dev;
 	struct phy_device *phy_dev;
 	struct dpaa_priv *priv;
+	u32 phy_vendor;
 
 	priv = netdev_priv(net_dev);
 	mac_dev = priv->mac_dev;
@@ -2905,9 +2907,11 @@ static int dpaa_phy_init(struct net_device *net_dev)
 		return -ENODEV;
 	}
 
+	phy_vendor = phy_dev->drv->phy_id & GENMASK(31, 10);
 	/* Unless the PHY is capable of rate adaptation */
 	if (mac_dev->phy_if != PHY_INTERFACE_MODE_XGMII ||
-	    ((phy_dev->drv->phy_id & GENMASK(31, 10)) != PHY_VEND_AQUANTIA)) {
+	    (phy_vendor != PHY_VEND_AQUANTIA &&
+	     phy_vendor != PHY_VEND_AQUANTIA2)) {
 		/* remove any features not supported by the controller */
 		ethtool_convert_legacy_u32_to_link_mode(mask,
 							mac_dev->if_support);
-- 
2.35.1.1320.gc452695387.dirty