[PATCH net-next v5 0/5] pcs-xpcs, stmmac: add 1000BASE-X AN for network switch

[PATCH net-next v5 0/5] pcs-xpcs, stmmac: add 1000BASE-X AN for network switch

[Ong Boon Leong]

Thanks for v4 review feedback in [1] and [2]. I have changed the v5
implementation as follow.

v5 changes:
1/5 - No change from v4.
2/5 - No change from v4.
3/5 - [Fix] make xpcs_modify_changed() static and use
      mdiodev_modify_changed() for cleaner code as suggested by
      Russell King.
4/5 - [Fix] Use fwnode_get_phy_mode() as recommended by Andrew Lunn.
5/5 - [Fix] Make fwnode = of_fwnode_handle(priv->plat->phylink_node)
      order after priv = netdev_priv(dev).

v4 changes:
1/5 - Squash v3:1/7 & 2/7 patches into v4:1/6 so that it passes build.
2/5 - [No change] same as v3:3/7
3/5 - [Fix] Fix issues identified by Russell in [1]
4/5 - [Fix] Drop v3:5/7 patch per input by Russell in [2] and make
            dwmac-intel clear the ovr_an_inband flag if fixed-link
            is used in ACPI _DSD.
5/5 - [No change] same as v3:7/7

For the steps to setup ACPI _DSD and checking, they are the same
as in [3]

Reference:
[1] https://patchwork.kernel.org/comment/24894239/
[2] https://patchwork.kernel.org/comment/24895330/
[3] https://patchwork.kernel.org/project/netdevbpf/cover/20220610033610.114084-1-boon.leong.ong@intel.com/

Thanks
Boon Leong

Ong Boon Leong (5):
  net: make xpcs_do_config to accept advertising for pcs-xpcs and
    sja1105
  stmmac: intel: prepare to support 1000BASE-X phy interface setting
  net: pcs: xpcs: add CL37 1000BASE-X AN support
  stmmac: intel: add phy-mode and fixed-link ACPI _DSD setting support
  net: stmmac: make mdio register skips PHY scanning for fixed-link

 drivers/net/dsa/sja1105/sja1105_main.c        |   2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-intel.c |  34 +++-
 .../net/ethernet/stmicro/stmmac/stmmac_main.c |  12 +-
 .../net/ethernet/stmicro/stmmac/stmmac_mdio.c |  14 ++
 drivers/net/pcs/pcs-xpcs.c                    | 176 +++++++++++++++++-
 drivers/net/pcs/pcs-xpcs.h                    |   1 -
 include/linux/pcs/pcs-xpcs.h                  |   3 +-
 7 files changed, 229 insertions(+), 13 deletions(-)

--
2.25.1

[PATCH net-next v5 1/5] net: make xpcs_do_config to accept advertising for pcs-xpcs and sja1105

[Ong Boon Leong]

xpcs_config() has 'advertising' input that is required for C37 1000BASE-X
AN in later patch series. So, we prepare xpcs_do_config() for it.

For sja1105, xpcs_do_config() is used for xpcs configuration without
depending on advertising input, so set to NULL.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
---
 drivers/net/dsa/sja1105/sja1105_main.c | 2 +-
 drivers/net/pcs/pcs-xpcs.c             | 6 +++---
 include/linux/pcs/pcs-xpcs.h           | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 72b6fc1932b..b253e27bcfb 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -2330,7 +2330,7 @@ int sja1105_static_config_reload(struct sja1105_private *priv,
 		else
 			mode = MLO_AN_PHY;
 
-		rc = xpcs_do_config(xpcs, priv->phy_mode[i], mode);
+		rc = xpcs_do_config(xpcs, priv->phy_mode[i], mode, NULL);
 		if (rc < 0)
 			goto out;
 
diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index 4cfd05c15ae..48d81c40aab 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -795,7 +795,7 @@ static int xpcs_config_2500basex(struct dw_xpcs *xpcs)
 }
 
 int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
-		   unsigned int mode)
+		   unsigned int mode, const unsigned long *advertising)
 {
 	const struct xpcs_compat *compat;
 	int ret;
@@ -843,7 +843,7 @@ static int xpcs_config(struct phylink_pcs *pcs, unsigned int mode,
 {
 	struct dw_xpcs *xpcs = phylink_pcs_to_xpcs(pcs);
 
-	return xpcs_do_config(xpcs, interface, mode);
+	return xpcs_do_config(xpcs, interface, mode, advertising);
 }
 
 static int xpcs_get_state_c73(struct dw_xpcs *xpcs,
@@ -864,7 +864,7 @@ static int xpcs_get_state_c73(struct dw_xpcs *xpcs,
 
 		state->link = 0;
 
-		return xpcs_do_config(xpcs, state->interface, MLO_AN_INBAND);
+		return xpcs_do_config(xpcs, state->interface, MLO_AN_INBAND, NULL);
 	}
 
 	if (state->an_enabled && xpcs_aneg_done_c73(xpcs, state, compat)) {
diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
index 266eb26fb02..37eb97cc228 100644
--- a/include/linux/pcs/pcs-xpcs.h
+++ b/include/linux/pcs/pcs-xpcs.h
@@ -30,7 +30,7 @@ int xpcs_get_an_mode(struct dw_xpcs *xpcs, phy_interface_t interface);
 void xpcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
 		  phy_interface_t interface, int speed, int duplex);
 int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
-		   unsigned int mode);
+		   unsigned int mode, const unsigned long *advertising);
 void xpcs_get_interfaces(struct dw_xpcs *xpcs, unsigned long *interfaces);
 int xpcs_config_eee(struct dw_xpcs *xpcs, int mult_fact_100ns,
 		    int enable);
-- 
2.25.1

[PATCH net-next v5 2/5] stmmac: intel: prepare to support 1000BASE-X phy interface setting

[Ong Boon Leong]

Currently, intel_speed_mode_2500() redundantly fix-up phy_interface to
PHY_INTERFACE_MODE_SGMII if the underlying controller is in 1000Mbps
SGMII mode. The value of phy_interface has been initialized earlier.

This patch removes such redundancy to prepare for setting 1000BASE-X
mode for certain hardware platform configuration.

Also update the intel_mgbe_common_data() to include 1000BASE-X setup.

Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
index 38fe77d1035..675dfb89b76 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
@@ -251,7 +251,6 @@ static void intel_speed_mode_2500(struct net_device *ndev, void *intel_data)
 		priv->plat->mdio_bus_data->xpcs_an_inband = false;
 	} else {
 		priv->plat->max_speed = 1000;
-		priv->plat->phy_interface = PHY_INTERFACE_MODE_SGMII;
 		priv->plat->mdio_bus_data->xpcs_an_inband = true;
 	}
 }
@@ -562,7 +561,8 @@ static int intel_mgbe_common_data(struct pci_dev *pdev,
 	plat->vlan_fail_q = plat->rx_queues_to_use - 1;
 
 	/* Intel mgbe SGMII interface uses pcs-xcps */
-	if (plat->phy_interface == PHY_INTERFACE_MODE_SGMII) {
+	if (plat->phy_interface == PHY_INTERFACE_MODE_SGMII ||
+	    plat->phy_interface == PHY_INTERFACE_MODE_1000BASEX) {
 		plat->mdio_bus_data->has_xpcs = true;
 		plat->mdio_bus_data->xpcs_an_inband = true;
 	}
-- 
2.25.1

[PATCH net-next v5 3/5] net: pcs: xpcs: add CL37 1000BASE-X AN support

[Ong Boon Leong]

For CL37 1000BASE-X AN, DW xPCS does not support C22 method but offers
C45 vendor-specific MII MMD for programming.

We also add the ability to disable Autoneg (through ethtool for certain
network switch that supports 1000BASE-X (1000Mbps and Full-Duplex) but
not Autoneg capability.

v4: Fixes to comment from Russell King. Thanks!
    https://patchwork.kernel.org/comment/24894239/
    Make xpcs_modify_changed() as private, change to use
    mdiodev_modify_changed() for cleaner code.

v3: Fixes to issues spotted by Russell King. Thanks!
    https://patchwork.kernel.org/comment/24890210/
    Use phylink_mii_c22_pcs_decode_state(), remove unnecessary
    interrupt clearing and skip speed & duplex setting if AN
    is enabled.

v2: Fixes to issues spotted by Russell King in v1. Thanks!
    https://patchwork.kernel.org/comment/24826650/
    Use phylink_mii_c22_pcs_encode_advertisement() and implement
    C45 MII ADV handling since IP only support C45 access.

Tested-by: Emilio Riva <emilio.riva@ericsson.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
---
 drivers/net/pcs/pcs-xpcs.c   | 170 +++++++++++++++++++++++++++++++++++
 drivers/net/pcs/pcs-xpcs.h   |   1 -
 include/linux/pcs/pcs-xpcs.h |   1 +
 3 files changed, 171 insertions(+), 1 deletion(-)

diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index 48d81c40aab..a5d520e34ea 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -77,6 +77,14 @@ static const int xpcs_sgmii_features[] = {
 	__ETHTOOL_LINK_MODE_MASK_NBITS,
 };
 
+static const int xpcs_1000basex_features[] = {
+	ETHTOOL_LINK_MODE_Pause_BIT,
+	ETHTOOL_LINK_MODE_Asym_Pause_BIT,
+	ETHTOOL_LINK_MODE_Autoneg_BIT,
+	ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
+	__ETHTOOL_LINK_MODE_MASK_NBITS,
+};
+
 static const int xpcs_2500basex_features[] = {
 	ETHTOOL_LINK_MODE_Pause_BIT,
 	ETHTOOL_LINK_MODE_Asym_Pause_BIT,
@@ -102,6 +110,10 @@ static const phy_interface_t xpcs_sgmii_interfaces[] = {
 	PHY_INTERFACE_MODE_SGMII,
 };
 
+static const phy_interface_t xpcs_1000basex_interfaces[] = {
+	PHY_INTERFACE_MODE_1000BASEX,
+};
+
 static const phy_interface_t xpcs_2500basex_interfaces[] = {
 	PHY_INTERFACE_MODE_2500BASEX,
 	PHY_INTERFACE_MODE_MAX,
@@ -112,6 +124,7 @@ enum {
 	DW_XPCS_10GKR,
 	DW_XPCS_XLGMII,
 	DW_XPCS_SGMII,
+	DW_XPCS_1000BASEX,
 	DW_XPCS_2500BASEX,
 	DW_XPCS_INTERFACE_MAX,
 };
@@ -189,6 +202,14 @@ int xpcs_write(struct dw_xpcs *xpcs, int dev, u32 reg, u16 val)
 	return mdiobus_c45_write(bus, addr, dev, reg, val);
 }
 
+static int xpcs_modify_changed(struct dw_xpcs *xpcs, int dev, u32 reg,
+			       u16 mask, u16 set)
+{
+	u32 reg_addr = mdiobus_c45_addr(dev, reg);
+
+	return mdiodev_modify_changed(xpcs->mdiodev, reg_addr, mask, set);
+}
+
 static int xpcs_read_vendor(struct dw_xpcs *xpcs, int dev, u32 reg)
 {
 	return xpcs_read(xpcs, dev, DW_VENDOR | reg);
@@ -237,6 +258,7 @@ static int xpcs_soft_reset(struct dw_xpcs *xpcs,
 		break;
 	case DW_AN_C37_SGMII:
 	case DW_2500BASEX:
+	case DW_AN_C37_1000BASEX:
 		dev = MDIO_MMD_VEND2;
 		break;
 	default:
@@ -772,6 +794,68 @@ static int xpcs_config_aneg_c37_sgmii(struct dw_xpcs *xpcs, unsigned int mode)
 	return ret;
 }
 
+static int xpcs_config_aneg_c37_1000basex(struct dw_xpcs *xpcs, unsigned int mode,
+					  const unsigned long *advertising)
+{
+	phy_interface_t interface = PHY_INTERFACE_MODE_1000BASEX;
+	int ret, mdio_ctrl, adv;
+	bool changed = 0;
+
+	/* According to Chap 7.12, to set 1000BASE-X C37 AN, AN must
+	 * be disabled first:-
+	 * 1) VR_MII_MMD_CTRL Bit(12)[AN_ENABLE] = 0b
+	 * 2) VR_MII_AN_CTRL Bit(2:1)[PCS_MODE] = 00b (1000BASE-X C37)
+	 */
+	mdio_ctrl = xpcs_read(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL);
+	if (mdio_ctrl < 0)
+		return mdio_ctrl;
+
+	if (mdio_ctrl & AN_CL37_EN) {
+		ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL,
+				 mdio_ctrl & ~AN_CL37_EN);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = xpcs_read(xpcs, MDIO_MMD_VEND2, DW_VR_MII_AN_CTRL);
+	if (ret < 0)
+		return ret;
+
+	ret &= ~DW_VR_MII_PCS_MODE_MASK;
+	ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_AN_CTRL, ret);
+	if (ret < 0)
+		return ret;
+
+	/* Check for advertising changes and update the C45 MII ADV
+	 * register accordingly.
+	 */
+	adv = phylink_mii_c22_pcs_encode_advertisement(interface,
+						       advertising);
+	if (adv >= 0) {
+		ret = xpcs_modify_changed(xpcs, MDIO_MMD_VEND2,
+					  MII_ADVERTISE, 0xffff, adv);
+		if (ret < 0)
+			return ret;
+
+		changed = ret;
+	}
+
+	/* Clear CL37 AN complete status */
+	ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_AN_INTR_STS, 0);
+	if (ret < 0)
+		return ret;
+
+	if (phylink_autoneg_inband(mode) &&
+	    linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, advertising)) {
+		ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL,
+				 mdio_ctrl | AN_CL37_EN);
+		if (ret < 0)
+			return ret;
+	}
+
+	return changed;
+}
+
 static int xpcs_config_2500basex(struct dw_xpcs *xpcs)
 {
 	int ret;
@@ -817,6 +901,12 @@ int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
 		if (ret)
 			return ret;
 		break;
+	case DW_AN_C37_1000BASEX:
+		ret = xpcs_config_aneg_c37_1000basex(xpcs, mode,
+						     advertising);
+		if (ret)
+			return ret;
+		break;
 	case DW_2500BASEX:
 		ret = xpcs_config_2500basex(xpcs);
 		if (ret)
@@ -921,6 +1011,29 @@ static int xpcs_get_state_c37_sgmii(struct dw_xpcs *xpcs,
 	return 0;
 }
 
+static int xpcs_get_state_c37_1000basex(struct dw_xpcs *xpcs,
+					struct phylink_link_state *state)
+{
+	int lpa, bmsr;
+
+	if (state->an_enabled) {
+		/* Reset link state */
+		state->link = false;
+
+		lpa = xpcs_read(xpcs, MDIO_MMD_VEND2, MII_LPA);
+		if (lpa < 0 || lpa & LPA_RFAULT)
+			return lpa;
+
+		bmsr = xpcs_read(xpcs, MDIO_MMD_VEND2, MII_BMSR);
+		if (bmsr < 0)
+			return bmsr;
+
+		phylink_mii_c22_pcs_decode_state(state, bmsr, lpa);
+	}
+
+	return 0;
+}
+
 static void xpcs_get_state(struct phylink_pcs *pcs,
 			   struct phylink_link_state *state)
 {
@@ -948,6 +1061,13 @@ static void xpcs_get_state(struct phylink_pcs *pcs,
 			       ERR_PTR(ret));
 		}
 		break;
+	case DW_AN_C37_1000BASEX:
+		ret = xpcs_get_state_c37_1000basex(xpcs, state);
+		if (ret) {
+			pr_err("xpcs_get_state_c37_1000basex returned %pe\n",
+			       ERR_PTR(ret));
+		}
+		break;
 	default:
 		return;
 	}
@@ -983,6 +1103,35 @@ static void xpcs_link_up_sgmii(struct dw_xpcs *xpcs, unsigned int mode,
 		pr_err("%s: xpcs_write returned %pe\n", __func__, ERR_PTR(ret));
 }
 
+static void xpcs_link_up_1000basex(struct dw_xpcs *xpcs, unsigned int mode,
+				   int speed, int duplex)
+{
+	int val, ret;
+
+	if (phylink_autoneg_inband(mode))
+		return;
+
+	switch (speed) {
+	case SPEED_1000:
+		val = BMCR_SPEED1000;
+		break;
+	case SPEED_100:
+	case SPEED_10:
+	default:
+		pr_err("%s: speed = %d\n", __func__, speed);
+		return;
+	}
+
+	if (duplex == DUPLEX_FULL)
+		val |= BMCR_FULLDPLX;
+	else
+		pr_err("%s: half duplex not supported\n", __func__);
+
+	ret = xpcs_write(xpcs, MDIO_MMD_VEND2, MDIO_CTRL1, val);
+	if (ret)
+		pr_err("%s: xpcs_write returned %pe\n", __func__, ERR_PTR(ret));
+}
+
 void xpcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
 		  phy_interface_t interface, int speed, int duplex)
 {
@@ -992,9 +1141,23 @@ void xpcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
 		return xpcs_config_usxgmii(xpcs, speed);
 	if (interface == PHY_INTERFACE_MODE_SGMII)
 		return xpcs_link_up_sgmii(xpcs, mode, speed, duplex);
+	if (interface == PHY_INTERFACE_MODE_1000BASEX)
+		return xpcs_link_up_1000basex(xpcs, mode, speed, duplex);
 }
 EXPORT_SYMBOL_GPL(xpcs_link_up);
 
+static void xpcs_an_restart(struct phylink_pcs *pcs)
+{
+	struct dw_xpcs *xpcs = phylink_pcs_to_xpcs(pcs);
+	int ret;
+
+	ret = xpcs_read(xpcs, MDIO_MMD_VEND2, MDIO_CTRL1);
+	if (ret >= 0) {
+		ret |= BMCR_ANRESTART;
+		xpcs_write(xpcs, MDIO_MMD_VEND2, MDIO_CTRL1, ret);
+	}
+}
+
 static u32 xpcs_get_id(struct dw_xpcs *xpcs)
 {
 	int ret;
@@ -1060,6 +1223,12 @@ static const struct xpcs_compat synopsys_xpcs_compat[DW_XPCS_INTERFACE_MAX] = {
 		.num_interfaces = ARRAY_SIZE(xpcs_sgmii_interfaces),
 		.an_mode = DW_AN_C37_SGMII,
 	},
+	[DW_XPCS_1000BASEX] = {
+		.supported = xpcs_1000basex_features,
+		.interface = xpcs_1000basex_interfaces,
+		.num_interfaces = ARRAY_SIZE(xpcs_1000basex_interfaces),
+		.an_mode = DW_AN_C37_1000BASEX,
+	},
 	[DW_XPCS_2500BASEX] = {
 		.supported = xpcs_2500basex_features,
 		.interface = xpcs_2500basex_interfaces,
@@ -1115,6 +1284,7 @@ static const struct phylink_pcs_ops xpcs_phylink_ops = {
 	.pcs_validate = xpcs_validate,
 	.pcs_config = xpcs_config,
 	.pcs_get_state = xpcs_get_state,
+	.pcs_an_restart = xpcs_an_restart,
 	.pcs_link_up = xpcs_link_up,
 };
 
diff --git a/drivers/net/pcs/pcs-xpcs.h b/drivers/net/pcs/pcs-xpcs.h
index 35651d32a22..770df50323a 100644
--- a/drivers/net/pcs/pcs-xpcs.h
+++ b/drivers/net/pcs/pcs-xpcs.h
@@ -109,7 +109,6 @@
 
 int xpcs_read(struct dw_xpcs *xpcs, int dev, u32 reg);
 int xpcs_write(struct dw_xpcs *xpcs, int dev, u32 reg, u16 val);
-
 int nxp_sja1105_sgmii_pma_config(struct dw_xpcs *xpcs);
 int nxp_sja1110_sgmii_pma_config(struct dw_xpcs *xpcs);
 int nxp_sja1110_2500basex_pma_config(struct dw_xpcs *xpcs);
diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
index 37eb97cc228..d2da1e0b4a9 100644
--- a/include/linux/pcs/pcs-xpcs.h
+++ b/include/linux/pcs/pcs-xpcs.h
@@ -17,6 +17,7 @@
 #define DW_AN_C73			1
 #define DW_AN_C37_SGMII			2
 #define DW_2500BASEX			3
+#define DW_AN_C37_1000BASEX		4
 
 struct xpcs_id;
 
-- 
2.25.1

[PATCH net-next v5 4/5] stmmac: intel: add phy-mode and fixed-link ACPI _DSD setting support

[Ong Boon Leong]

Currently, phy_interface for TSN controller instance is set based on its
PCI Device ID. For SGMII PHY interface, phy_interface default to
PHY_INTERFACE_MODE_SGMII. As C37 AN supports both SGMII and 1000BASE-X
mode, we add support for 'phy-mode' ACPI _DSD for port-specific
and customer platform specific customization.

v3: use fwnode_get_phy_mode() as suggested by Andrew Lunn in
https://patchwork.kernel.org/comment/24895330/

v2:
For platform that sets 'fixed-link' using ACPI _DSD, we will unset
xpcs_an_inband within stmmac. Thanks to Russell King for his comment in
https://patchwork.kernel.org/comment/24890222/

v1:
Thanks to Andrew Lunn's guidance in
https://patchwork.kernel.org/comment/24827101/

Tested-by: Emilio Riva <emilio.riva@ericsson.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
---
 .../net/ethernet/stmicro/stmmac/dwmac-intel.c | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
index 675dfb89b76..d0e82cb5ae0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
@@ -442,6 +442,7 @@ static void common_default_data(struct plat_stmmacenet_data *plat)
 static int intel_mgbe_common_data(struct pci_dev *pdev,
 				  struct plat_stmmacenet_data *plat)
 {
+	struct fwnode_handle *fwnode;
 	char clk_name[20];
 	int ret;
 	int i;
@@ -560,6 +561,24 @@ static int intel_mgbe_common_data(struct pci_dev *pdev,
 	/* Use the last Rx queue */
 	plat->vlan_fail_q = plat->rx_queues_to_use - 1;
 
+	/* For fixed-link setup, we allow phy-mode setting */
+	fwnode = dev_fwnode(&pdev->dev);
+	if (fwnode) {
+		int phy_mode;
+
+		/* "phy-mode" setting is optional. If it is set,
+		 *  we allow either sgmii or 1000base-x for now.
+		 */
+		phy_mode = fwnode_get_phy_mode(fwnode);
+		if (phy_mode >= 0) {
+			if (phy_mode == PHY_INTERFACE_MODE_SGMII ||
+			    phy_mode == PHY_INTERFACE_MODE_1000BASEX)
+				plat->phy_interface = phy_mode;
+			else
+				dev_warn(&pdev->dev, "Invalid phy-mode\n");
+		}
+	}
+
 	/* Intel mgbe SGMII interface uses pcs-xcps */
 	if (plat->phy_interface == PHY_INTERFACE_MODE_SGMII ||
 	    plat->phy_interface == PHY_INTERFACE_MODE_1000BASEX) {
@@ -567,6 +586,17 @@ static int intel_mgbe_common_data(struct pci_dev *pdev,
 		plat->mdio_bus_data->xpcs_an_inband = true;
 	}
 
+	/* For fixed-link setup, we clear xpcs_an_inband */
+	if (fwnode) {
+		struct fwnode_handle *fixed_node;
+
+		fixed_node = fwnode_get_named_child_node(fwnode, "fixed-link");
+		if (fixed_node)
+			plat->mdio_bus_data->xpcs_an_inband = false;
+
+		fwnode_handle_put(fixed_node);
+	}
+
 	/* Ensure mdio bus scan skips intel serdes and pcs-xpcs */
 	plat->mdio_bus_data->phy_mask = 1 << INTEL_MGBE_ADHOC_ADDR;
 	plat->mdio_bus_data->phy_mask |= 1 << INTEL_MGBE_XPCS_ADDR;
-- 
2.25.1

[PATCH net-next v5 5/5] net: stmmac: make mdio register skips PHY scanning for fixed-link

[Ong Boon Leong]

stmmac_mdio_register() lacks fixed-link consideration and only skip PHY
scanning if it has done DT style PHY discovery. So, for DT or ACPI _DSD
setting of fixed-link, the PHY scanning should not happen.

v2: fix incorrect order related to fwnode that is not caught in non-DT
    platform.

Tested-by: Emilio Riva <emilio.riva@ericsson.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 12 +++++++-----
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 14 ++++++++++++++
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 73cae2938f6..50867e5d0d9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1142,18 +1142,20 @@ static void stmmac_check_pcs_mode(struct stmmac_priv *priv)
 static int stmmac_init_phy(struct net_device *dev)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
-	struct device_node *node;
+	struct fwnode_handle *fwnode;
 	int ret;
 
-	node = priv->plat->phylink_node;
+	fwnode = of_fwnode_handle(priv->plat->phylink_node);
+	if (!fwnode)
+		fwnode = dev_fwnode(priv->device);
 
-	if (node)
-		ret = phylink_of_phy_connect(priv->phylink, node, 0);
+	if (fwnode)
+		ret = phylink_fwnode_phy_connect(priv->phylink, fwnode, 0);
 
 	/* Some DT bindings do not set-up the PHY handle. Let's try to
 	 * manually parse it
 	 */
-	if (!node || ret) {
+	if (!fwnode || ret) {
 		int addr = priv->plat->phy_addr;
 		struct phy_device *phydev;
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index 03d3d1f7aa4..5f177ea8072 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -434,9 +434,11 @@ int stmmac_mdio_register(struct net_device *ndev)
 	int err = 0;
 	struct mii_bus *new_bus;
 	struct stmmac_priv *priv = netdev_priv(ndev);
+	struct fwnode_handle *fwnode = of_fwnode_handle(priv->plat->phylink_node);
 	struct stmmac_mdio_bus_data *mdio_bus_data = priv->plat->mdio_bus_data;
 	struct device_node *mdio_node = priv->plat->mdio_node;
 	struct device *dev = ndev->dev.parent;
+	struct fwnode_handle *fixed_node;
 	int addr, found, max_addr;
 
 	if (!mdio_bus_data)
@@ -490,6 +492,18 @@ int stmmac_mdio_register(struct net_device *ndev)
 	if (priv->plat->has_xgmac)
 		stmmac_xgmac2_mdio_read(new_bus, 0, MII_ADDR_C45);
 
+	/* If fixed-link is set, skip PHY scanning */
+	if (!fwnode)
+		fwnode = dev_fwnode(priv->device);
+
+	if (fwnode) {
+		fixed_node = fwnode_get_named_child_node(fwnode, "fixed-link");
+		if (fixed_node) {
+			fwnode_handle_put(fixed_node);
+			goto bus_register_done;
+		}
+	}
+
 	if (priv->plat->phy_node || mdio_node)
 		goto bus_register_done;
 
-- 
2.25.1

Re: [PATCH net-next v5 3/5] net: pcs: xpcs: add CL37 1000BASE-X AN support

[Russell King (Oracle)]

On Wed, Jun 15, 2022 at 04:39:06PM +0800, Ong Boon Leong wrote:
> For CL37 1000BASE-X AN, DW xPCS does not support C22 method but offers
> C45 vendor-specific MII MMD for programming.
> 
> We also add the ability to disable Autoneg (through ethtool for certain
> network switch that supports 1000BASE-X (1000Mbps and Full-Duplex) but
> not Autoneg capability.
> 
> v4: Fixes to comment from Russell King. Thanks!
>     https://patchwork.kernel.org/comment/24894239/
>     Make xpcs_modify_changed() as private, change to use
>     mdiodev_modify_changed() for cleaner code.
> 
> v3: Fixes to issues spotted by Russell King. Thanks!
>     https://patchwork.kernel.org/comment/24890210/
>     Use phylink_mii_c22_pcs_decode_state(), remove unnecessary
>     interrupt clearing and skip speed & duplex setting if AN
>     is enabled.
> 
> v2: Fixes to issues spotted by Russell King in v1. Thanks!
>     https://patchwork.kernel.org/comment/24826650/
>     Use phylink_mii_c22_pcs_encode_advertisement() and implement
>     C45 MII ADV handling since IP only support C45 access.
> 
> Tested-by: Emilio Riva <emilio.riva@ericsson.com>
> Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>

Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

Thanks!

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Re: [PATCH net-next v5 0/5] pcs-xpcs, stmmac: add 1000BASE-X AN for network switch

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Wed, 15 Jun 2022 16:39:03 +0800 you wrote:
> Thanks for v4 review feedback in [1] and [2]. I have changed the v5
> implementation as follow.
> 
> v5 changes:
> 1/5 - No change from v4.
> 2/5 - No change from v4.
> 3/5 - [Fix] make xpcs_modify_changed() static and use
>       mdiodev_modify_changed() for cleaner code as suggested by
>       Russell King.
> 4/5 - [Fix] Use fwnode_get_phy_mode() as recommended by Andrew Lunn.
> 5/5 - [Fix] Make fwnode = of_fwnode_handle(priv->plat->phylink_node)
>       order after priv = netdev_priv(dev).
> 
> [...]

Here is the summary with links:
  - [net-next,v5,1/5] net: make xpcs_do_config to accept advertising for pcs-xpcs and sja1105
    https://git.kernel.org/netdev/net-next/c/fa9c562f9735
  - [net-next,v5,2/5] stmmac: intel: prepare to support 1000BASE-X phy interface setting
    https://git.kernel.org/netdev/net-next/c/c82386310d95
  - [net-next,v5,3/5] net: pcs: xpcs: add CL37 1000BASE-X AN support
    https://git.kernel.org/netdev/net-next/c/b47aec885bcd
  - [net-next,v5,4/5] stmmac: intel: add phy-mode and fixed-link ACPI _DSD setting support
    https://git.kernel.org/netdev/net-next/c/72edaf39fc65
  - [net-next,v5,5/5] net: stmmac: make mdio register skips PHY scanning for fixed-link
    https://git.kernel.org/netdev/net-next/c/ab21cf920928

You are awesome, thank you!
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