[PATCH v2 net] Add genphy_c45_config_aneg() function to phy-c45.c

[Marco Hartmann]

Commit 34786005eca3 ("net: phy: prevent PHYs w/o Clause 22 regs from calling
genphy_config_aneg") introduced a check that aborts phy_config_aneg()
if the phy is a C45 phy.
This causes phy_state_machine() to call phy_error() so that the phy
ends up in PHY_HALTED state.

Instead of returning -EOPNOTSUPP, call genphy_c45_config_aneg()
(analogous to the C22 case) so that the state machine can run
correctly.

genphy_c45_config_aneg() closely resembles mv3310_config_aneg()
in drivers/net/phy/marvell10g.c, excluding vendor specific
configurations for 1000BaseT.

Fixes: 22b56e827093 ("net: phy: replace genphy_10g_driver with genphy_c45_driver")

Signed-off-by: Marco Hartmann <marco.hartmann@xxxxxxx>
---
Changes in v2:
- corrected commit message
- reordered variables
---
---
 drivers/net/phy/phy-c45.c | 26 ++++++++++++++++++++++++++
 drivers/net/phy/phy.c     |  2 +-
 include/linux/phy.h       |  1 +
 3 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index 58bb25e4af10..7935593debb1 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -523,6 +523,32 @@ int genphy_c45_read_status(struct phy_device *phydev)
 }
 EXPORT_SYMBOL_GPL(genphy_c45_read_status);
 
+/**
+ * genphy_c45_config_aneg - restart auto-negotiation or forced setup
+ * @phydev: target phy_device struct
+ *
+ * Description: If auto-negotiation is enabled, we configure the
+ *   advertising, and then restart auto-negotiation.  If it is not
+ *   enabled, then we force a configuration.
+ */
+int genphy_c45_config_aneg(struct phy_device *phydev)
+{
+	bool changed = false;
+	int ret;
+
+	if (phydev->autoneg == AUTONEG_DISABLE)
+		return genphy_c45_pma_setup_forced(phydev);
+
+	ret = genphy_c45_an_config_aneg(phydev);
+	if (ret < 0)
+		return ret;
+	if (ret > 0)
+		changed = true;
+
+	return genphy_c45_check_and_restart_aneg(phydev, changed);
+}
+EXPORT_SYMBOL_GPL(genphy_c45_config_aneg);
+
 /* The gen10g_* functions are the old Clause 45 stub */
 
 int gen10g_config_aneg(struct phy_device *phydev)
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index f3adea9ef400..74c4e15ebe52 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -507,7 +507,7 @@ static int phy_config_aneg(struct phy_device *phydev)
 	 * allowed to call genphy_config_aneg()
 	 */
 	if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
-		return -EOPNOTSUPP;
+		return genphy_c45_config_aneg(phydev);
 
 	return genphy_config_aneg(phydev);
 }
diff --git a/include/linux/phy.h b/include/linux/phy.h
index d26779f1fb6b..a7ecbe0e55aa 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1117,6 +1117,7 @@ int genphy_c45_an_disable_aneg(struct phy_device *phydev);
 int genphy_c45_read_mdix(struct phy_device *phydev);
 int genphy_c45_pma_read_abilities(struct phy_device *phydev);
 int genphy_c45_read_status(struct phy_device *phydev);
+int genphy_c45_config_aneg(struct phy_device *phydev);
 
 /* The gen10g_* functions are the old Clause 45 stub */
 int gen10g_config_aneg(struct phy_device *phydev);
-- 
2.7.4