Subject: Re: [PATCH RFC russell-king 0/4] Support for RollBall 10G copper SFP modules

From: Russell King - ARM Linux admin <[email-masked]>
Date: Mon, 17 Aug 2020 14:49:09 +0100

On Tue, Aug 11, 2020 at 12:06:41AM +0200, Marek Behún wrote:
> Hi Russell,
> 
> this series should apply on linux-arm git repository, on branch
> clearfog.

How about something like this - only build tested, and you may
encounter fuzz with this:

diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 147b4cf4188e..bcbef68e0917 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -117,6 +117,7 @@ enum {
 	MV_V2_PORT_CTRL_FT_1000BASEX = 0 << 3,
 	MV_V2_PORT_CTRL_FT_SGMII = 1 << 3,
 	MV_V2_PORT_CTRL_FT_10GBASER = 3 << 3,
+	MV_V2_PORT_CTRL_MACTYPE	= 7 << 0,
 	MV_V2_UIS		= 0xf040,
 	MV_V2_PIS		= 0xf042,
 	MV_V2_PIS_PI		= BIT(0),
@@ -691,17 +692,44 @@ static bool mv3310_has_pma_ngbaset_quirk(struct phy_device *phydev)
 		MV_PHY_ALASKA_NBT_QUIRK_MASK) == MV_PHY_ALASKA_NBT_QUIRK_REV;
 }
 
+static int mv3310_select_mode(struct phy_device *phydev,
+			      unsigned long *host_interfaces)
+{
+	int mac_type = -1;
+
+	if (test_bit(PHY_INTERFACE_MODE_USXGMII, host_interfaces))
+		mac_type = 7;
+	else if (test_bit(PHY_INTERFACE_MODE_SGMII, host_interfaces) &&
+		 test_bit(PHY_INTERFACE_MODE_10GBASER, host_interfaces))
+		mac_type = 4;
+	else if (test_bit(PHY_INTERFACE_MODE_SGMII, host_interfaces) &&
+		 test_bit(PHY_INTERFACE_MODE_RXAUI, host_interfaces))
+		mac_type = 0;
+	else if (test_bit(PHY_INTERFACE_MODE_10GBASER, host_interfaces))
+		mac_type = 6;
+	else if (test_bit(PHY_INTERFACE_MODE_RXAUI, host_interfaces))
+		mac_type = 2;
+	else if (test_bit(PHY_INTERFACE_MODE_SGMII, host_interfaces))
+		mac_type = 4;
+
+	return mac_type;
+}
+
 static int mv3310_config_init(struct phy_device *phydev)
 {
-	int err;
+	int ret, err, mac_type = -1;
 
 	/* Check that the PHY interface type is compatible */
-	if (phydev->interface != PHY_INTERFACE_MODE_SGMII &&
-	    phydev->interface != PHY_INTERFACE_MODE_2500BASEX &&
-	    phydev->interface != PHY_INTERFACE_MODE_XAUI &&
-	    phydev->interface != PHY_INTERFACE_MODE_RXAUI &&
-	    phydev->interface != PHY_INTERFACE_MODE_10GBASER)
+	if (!phy_interface_empty(phydev->host_interfaces)) {
+		mac_type = mv3310_select_mode(phydev, phydev->host_interfaces);
+		phydev_info(phydev, "mac_type=%d\n", mac_type);
+	} else if (phydev->interface != PHY_INTERFACE_MODE_SGMII &&
+		   phydev->interface != PHY_INTERFACE_MODE_2500BASEX &&
+		   phydev->interface != PHY_INTERFACE_MODE_XAUI &&
+		   phydev->interface != PHY_INTERFACE_MODE_RXAUI &&
+		   phydev->interface != PHY_INTERFACE_MODE_10GBASER) {
 		return -ENODEV;
+	}
 
 	phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
 
@@ -710,6 +738,20 @@ static int mv3310_config_init(struct phy_device *phydev)
 	if (err)
 		return err;
 
+	if (mac_type != -1) {
+		ret = phy_modify_mmd_changed(phydev, MDIO_MMD_VEND2,
+					     MV_V2_PORT_CTRL,
+					     MV_V2_PORT_CTRL_MACTYPE, mac_type);
+		if (ret > 0)
+			ret = phy_modify_mmd(phydev, MDIO_MMD_VEND2,
+					     MV_V2_PORT_CTRL,
+					     MV_V2_PORT_CTRL_SWRST,
+					     MV_V2_PORT_CTRL_SWRST);
+
+		if (ret < 0)
+			return ret;
+	}
+
 	/* Enable EDPD mode - saving 600mW */
 	err = mv3310_set_edpd(phydev, ETHTOOL_PHY_EDPD_DFLT_TX_MSECS);
 	if (err)
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 5785eb040f11..4ad64973432a 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -2082,6 +2082,8 @@ static void phylink_sfp_detach(void *upstream, struct sfp_bus *bus)
 	sfp_bus_unlink_netdev(bus, pl->netdev);
 }
 
+static DECLARE_PHY_INTERFACE_MASK(phylink_sfp_interfaces);
+
 static const phy_interface_t phylink_sfp_interface_preference[] = {
 	PHY_INTERFACE_MODE_USXGMII,
 	PHY_INTERFACE_MODE_10GBASER,
@@ -2091,6 +2093,18 @@ static const phy_interface_t phylink_sfp_interface_preference[] = {
 	PHY_INTERFACE_MODE_1000BASEX,
 };
 
+static int __init phylink_init(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(phylink_sfp_interface_preference); i++)
+		set_bit(phylink_sfp_interface_preference[i],
+			phylink_sfp_interfaces);
+
+	return 0;
+}
+module_init(phylink_init);
+
 static phy_interface_t phylink_select_interface(struct phylink *pl,
 						const unsigned long *intf,
 						const char *intf_name)
@@ -2342,6 +2356,10 @@ static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
 	else
 		mode = MLO_AN_INBAND;
 
+	/* Set the PHY's host supported interfaces */
+	phy_interface_and(phy->host_interfaces, phylink_sfp_interfaces,
+			  pl->config->supported_interfaces);
+
 	if (!phy_interface_empty(phy->supported_interfaces) &&
 	    !phy_interface_empty(pl->config->supported_interfaces)) {
 		interface = phylink_select_interface(pl,
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 7408e2240c1e..14f73378f4e9 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -527,6 +527,7 @@ struct phy_device {
 
 	/* bitmap of supported interfaces */
 	DECLARE_PHY_INTERFACE_MASK(supported_interfaces);
+	DECLARE_PHY_INTERFACE_MASK(host_interfaces);
 
 	/* Energy efficient ethernet modes which should be prohibited */
 	u32 eee_broken_modes;

-- 
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