707-v5.1-net-phy-add-genphy_c45_check_and_restart_aneg.patch

From 2c3db705737cf52d7d24c993f0889b25b956c718 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Mon, 18 Feb 2019 21:27:18 +0100
Subject: [PATCH 605/660] net: phy: add genphy_c45_check_and_restart_aneg

This function will be used by config_aneg callback implementations of
PHY drivers and allows to reduce boilerplate code.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/phy/phy-c45.c | 30 ++++++++++++++++++++++++++++++
 include/linux/phy.h       |  1 +
 2 files changed, 31 insertions(+)

--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -110,6 +110,36 @@ int genphy_c45_restart_aneg(struct phy_d
 EXPORT_SYMBOL_GPL(genphy_c45_restart_aneg);
 
 /**
+ * genphy_c45_check_and_restart_aneg - Enable and restart auto-negotiation
+ * @phydev: target phy_device struct
+ * @restart: whether aneg restart is requested
+ *
+ * This assumes that the auto-negotiation MMD is present.
+ *
+ * Check, and restart auto-negotiation if needed.
+ */
+int genphy_c45_check_and_restart_aneg(struct phy_device *phydev, bool restart)
+{
+	int ret = 0;
+
+	if (!restart) {
+		/* Configure and restart aneg if it wasn't set before */
+		ret = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
+		if (ret < 0)
+			return ret;
+
+		if (!(ret & MDIO_AN_CTRL1_ENABLE))
+			restart = true;
+	}
+
+	if (restart)
+		ret = genphy_c45_restart_aneg(phydev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(genphy_c45_check_and_restart_aneg);
+
+/**
  * genphy_c45_aneg_done - return auto-negotiation complete status
  * @phydev: target phy_device struct
  *
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1098,6 +1098,7 @@ int genphy_write_mmd_unsupported(struct
 
 /* Clause 45 PHY */
 int genphy_c45_restart_aneg(struct phy_device *phydev);
+int genphy_c45_check_and_restart_aneg(struct phy_device *phydev, bool restart);
 int genphy_c45_aneg_done(struct phy_device *phydev);
 int genphy_c45_read_link(struct phy_device *phydev, u32 mmd_mask);
 int genphy_c45_read_lpa(struct phy_device *phydev);