From 35902404fce9e8007a69ba893a8a8e569494209e Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Mon, 24 Nov 2014 09:33:48 +0000
Subject: [PATCH] ar8216: Fix issue with autoneg being disabled under 3.14,
 revert 43332

Patch reverts 43332 which seems to cause issues with VLAN functionality.
Add a specific check to check whether ANEG is still enabled and re-enable
it if necessary. Disable generic phy soft reset for kernel >=3.16.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

SVN-Revision: 43356
---
 .../generic/files/drivers/net/phy/ar8216.c    | 49 ++++++++++++++++++-
 1 file changed, 47 insertions(+), 2 deletions(-)

diff --git a/target/linux/generic/files/drivers/net/phy/ar8216.c b/target/linux/generic/files/drivers/net/phy/ar8216.c
index 1d58f3a5d7..5e93a1f75d 100644
--- a/target/linux/generic/files/drivers/net/phy/ar8216.c
+++ b/target/linux/generic/files/drivers/net/phy/ar8216.c
@@ -36,6 +36,7 @@
 #include <linux/of_device.h>
 #include <linux/leds.h>
 #include <linux/gpio.h>
+#include <linux/version.h>
 
 #include "ar8216.h"
 
@@ -342,6 +343,29 @@ ar8xxx_phy_poll_reset(struct mii_bus *bus)
         return -ETIMEDOUT;
 }
 
+static int
+ar8xxx_phy_check_aneg(struct phy_device *phydev)
+{
+	int ret;
+
+	if (phydev->autoneg != AUTONEG_ENABLE)
+		return 0;
+	/*
+	 * BMCR_ANENABLE might have been cleared
+	 * by phy_init_hw in certain kernel versions
+	 * therefore check for it
+	 */
+	ret = phy_read(phydev, MII_BMCR);
+	if (ret < 0)
+		return ret;
+	if (ret & BMCR_ANENABLE)
+		return 0;
+
+	dev_info(&phydev->dev, "ANEG disabled, re-enabling ...\n");
+	ret |= BMCR_ANENABLE | BMCR_ANRESTART;
+	return phy_write(phydev, MII_BMCR, ret);
+}
+
 static void
 ar8xxx_phy_init(struct ar8xxx_priv *priv)
 {
@@ -2774,7 +2798,7 @@ ar8xxx_phy_config_init(struct phy_device *phydev)
 		return -ENODEV;
 
 	if (chip_is_ar8327(priv) || chip_is_ar8337(priv))
-		return 0;
+		return ar8xxx_phy_check_aneg(phydev);
 
 	priv->phy = phydev;
 
@@ -2848,6 +2872,15 @@ ar8xxx_phy_read_status(struct phy_device *phydev)
 	return ret;
 }
 
+static int
+ar8xxx_phy_config_aneg(struct phy_device *phydev)
+{
+	if (phydev->addr == 0)
+		return 0;
+
+	return genphy_config_aneg(phydev);
+}
+
 static const u32 ar8xxx_phy_ids[] = {
 	0x004dd033,
 	0x004dd034, /* AR8327 */
@@ -3010,6 +3043,15 @@ ar8xxx_phy_remove(struct phy_device *phydev)
 	ar8xxx_free(priv);
 }
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)
+static int
+ar8xxx_phy_soft_reset(struct phy_device *phydev)
+{
+	/* we don't need an extra reset */
+	return 0;
+}
+#endif
+
 static struct phy_driver ar8xxx_phy_driver = {
 	.phy_id		= 0x004d0000,
 	.name		= "Atheros AR8216/AR8236/AR8316",
@@ -3019,8 +3061,11 @@ static struct phy_driver ar8xxx_phy_driver = {
 	.remove		= ar8xxx_phy_remove,
 	.detach		= ar8xxx_phy_detach,
 	.config_init	= ar8xxx_phy_config_init,
-	.config_aneg	= genphy_config_aneg,
+	.config_aneg	= ar8xxx_phy_config_aneg,
 	.read_status	= ar8xxx_phy_read_status,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)
+	.soft_reset	= ar8xxx_phy_soft_reset,
+#endif
 	.driver		= { .owner = THIS_MODULE },
 };