netdev - [PATCH net-next 2/2] net: phy: mscc: configure in-band auto-negotiation for VSC8514

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Message-Id: <20210212172341.3489046-3-olteanv@gmail.com>
Date:   Fri, 12 Feb 2021 19:23:41 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Antoine Tenart <atenart@...nel.org>,
        Quentin Schulz <quentin.schulz@...tlin.com>,
        Michael Walle <michael@...le.cc>, netdev@...r.kernel.org,
        Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
        Steen Hegelund <steen.hegelund@...rochip.com>,
        UNGLinuxDriver@...rochip.com
Subject: [PATCH net-next 2/2] net: phy: mscc: configure in-band auto-negotiation for VSC8514

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

Add the in-band configuration knob for the VSC8514 quad PHY. Tested with
QSGMII in-band AN both on and off on NXP LS1028A-RDB and T1040-RDB.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/phy/mscc/mscc.h      |  2 ++
 drivers/net/phy/mscc/mscc_main.c | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/net/phy/mscc/mscc.h b/drivers/net/phy/mscc/mscc.h
index 9481bce94c2e..44d1d8f28481 100644
--- a/drivers/net/phy/mscc/mscc.h
+++ b/drivers/net/phy/mscc/mscc.h
@@ -187,6 +187,8 @@ enum rgmii_clock_delay {
 #define MSCC_PHY_EXTENDED_INT_MS_EGR	  BIT(9)
 
 /* Extended Page 3 Registers */
+#define MSCC_PHY_SERDES_PCS_CTRL	  16
+#define MSCC_PHY_SERDES_ANEG		  BIT(7)
 #define MSCC_PHY_SERDES_TX_VALID_CNT	  21
 #define MSCC_PHY_SERDES_TX_CRC_ERR_CNT	  22
 #define MSCC_PHY_SERDES_RX_VALID_CNT	  28
diff --git a/drivers/net/phy/mscc/mscc_main.c b/drivers/net/phy/mscc/mscc_main.c
index 2f2157e3deab..2951ed216620 100644
--- a/drivers/net/phy/mscc/mscc_main.c
+++ b/drivers/net/phy/mscc/mscc_main.c
@@ -1986,6 +1986,18 @@ static int vsc85xx_read_status(struct phy_device *phydev)
 	return genphy_read_status(phydev);
 }
 
+static int vsc8514_config_inband_aneg(struct phy_device *phydev, bool enabled)
+{
+	int reg_val = 0;
+
+	if (enabled)
+		reg_val = MSCC_PHY_SERDES_ANEG;
+
+	return phy_modify_paged(phydev, MSCC_PHY_PAGE_EXTENDED_3,
+				MSCC_PHY_SERDES_PCS_CTRL, MSCC_PHY_SERDES_ANEG,
+				reg_val);
+}
+
 static int vsc8514_probe(struct phy_device *phydev)
 {
 	struct vsc8531_private *vsc8531;
@@ -2176,6 +2188,7 @@ static struct phy_driver vsc85xx_driver[] = {
 	.phy_id_mask	= 0xfffffff0,
 	.soft_reset	= &genphy_soft_reset,
 	.config_init    = &vsc8514_config_init,
+	.config_inband_aneg = vsc8514_config_inband_aneg,
 	.config_aneg    = &vsc85xx_config_aneg,
 	.read_status	= &vsc85xx_read_status,
 	.handle_interrupt = vsc85xx_handle_interrupt,
-- 
2.25.1