netdev - [PATCH v3 net-next 05/13] net: pcs: xpcs: add support for sgmii with no inband AN

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Date:   Fri, 11 Jun 2021 23:05:23 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:     Wong Vee Khee <vee.khee.wong@...ux.intel.com>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH v3 net-next 05/13] net: pcs: xpcs: add support for sgmii with no inband AN

From: Vladimir Oltean <vladimir.oltean@....com>

In fixed-link use cases, the XPCS can disable the clause 37 in-band
autoneg process, disable the "Automatic Speed Mode Change after CL37 AN"
setting, and force operation in a speed dictated by management.

Add support for this operating mode.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
v2->v3: none
v1->v2: none

 drivers/net/pcs/pcs-xpcs.c | 41 +++++++++++++++++++++++++++++++++++---
 1 file changed, 38 insertions(+), 3 deletions(-)

diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index 8ca7592b02ec..743b53734eeb 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -690,7 +690,7 @@ int xpcs_config_eee(struct dw_xpcs *xpcs, int mult_fact_100ns, int enable)
 }
 EXPORT_SYMBOL_GPL(xpcs_config_eee);
 
-static int xpcs_config_aneg_c37_sgmii(struct dw_xpcs *xpcs)
+static int xpcs_config_aneg_c37_sgmii(struct dw_xpcs *xpcs, unsigned int mode)
 {
 	int ret;
 
@@ -726,7 +726,10 @@ static int xpcs_config_aneg_c37_sgmii(struct dw_xpcs *xpcs)
 	if (ret < 0)
 		return ret;
 
-	ret |= DW_VR_MII_DIG_CTRL1_MAC_AUTO_SW;
+	if (phylink_autoneg_inband(mode))
+		ret |= DW_VR_MII_DIG_CTRL1_MAC_AUTO_SW;
+	else
+		ret &= ~DW_VR_MII_DIG_CTRL1_MAC_AUTO_SW;
 
 	return xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_DIG_CTRL1, ret);
 }
@@ -772,7 +775,7 @@ static int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
 		}
 		break;
 	case DW_AN_C37_SGMII:
-		ret = xpcs_config_aneg_c37_sgmii(xpcs);
+		ret = xpcs_config_aneg_c37_sgmii(xpcs, mode);
 		if (ret)
 			return ret;
 		break;
@@ -905,6 +908,36 @@ static void xpcs_get_state(struct phylink_pcs *pcs,
 	}
 }
 
+static void xpcs_link_up_sgmii(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:
+		val = BMCR_SPEED100;
+		break;
+	case SPEED_10:
+		val = BMCR_SPEED10;
+		break;
+	default:
+		return;
+	}
+
+	if (duplex == DUPLEX_FULL)
+		val |= BMCR_FULLDPLX;
+
+	ret = xpcs_write(xpcs, MDIO_MMD_VEND2, MDIO_CTRL1, val);
+	if (ret)
+		pr_err("%s: xpcs_write returned %pe\n", __func__, ERR_PTR(ret));
+}
+
 static void xpcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
 			 phy_interface_t interface, int speed, int duplex)
 {
@@ -912,6 +945,8 @@ static void xpcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
 
 	if (interface == PHY_INTERFACE_MODE_USXGMII)
 		return xpcs_config_usxgmii(xpcs, speed);
+	if (interface == PHY_INTERFACE_MODE_SGMII)
+		return xpcs_link_up_sgmii(xpcs, mode, speed, duplex);
 }
 
 static u32 xpcs_get_id(struct dw_xpcs *xpcs)
-- 
2.25.1