ath79: Make upstream ag71xx driver work

* Fix some bugs in the driver
* Add missing clock and reset references in dts
* Rename mdio-bus to mdio so the driver find it

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

3 files changed, 175 insertions, 0 deletions

diff --git a/target/linux/ath79/patches-5.4/200-ag71xx-Handle-allocation-errors-in-ag71xx_rings_init.patch b/target/linux/ath79/patches-5.4/200-ag71xx-Handle-allocation-errors-in-ag71xx_rings_init.patch
new file mode 100644
index 0000000000..6631cb8e17
--- /dev/null
+++ b/target/linux/ath79/patches-5.4/200-ag71xx-Handle-allocation-errors-in-ag71xx_rings_init.patch
@@ -0,0 +1,61 @@
+From 2cee757eaf5cc6175bc0ac7b0b808794124ec40a Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Mon, 17 Feb 2020 23:40:14 +0100
+Subject: [PATCH 1/3] ag71xx: Handle allocation errors in ag71xx_rings_init()
+
+Free the allocated resources in ag71xx_rings_init() in case
+ag71xx_ring_rx_init() returns an error.
+
+This is only a potential problem, I did not ran into this one.
+
+Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
+Fixes: d51b6ce441d3 ("net: ethernet: add ag71xx driver")
+---
+ drivers/net/ethernet/atheros/ag71xx.c | 22 ++++++++++++++++++----
+ 1 file changed, 18 insertions(+), 4 deletions(-)
+
+--- a/drivers/net/ethernet/atheros/ag71xx.c
++++ b/drivers/net/ethernet/atheros/ag71xx.c
+@@ -1133,6 +1133,7 @@ static int ag71xx_rings_init(struct ag71
+ 	struct ag71xx_ring *tx = &ag->tx_ring;
+ 	struct ag71xx_ring *rx = &ag->rx_ring;
+ 	int ring_size, tx_size;
++	int ret;
+ 
+ 	ring_size = BIT(tx->order) + BIT(rx->order);
+ 	tx_size = BIT(tx->order);
+@@ -1145,9 +1146,8 @@ static int ag71xx_rings_init(struct ag71
+ 					   ring_size * AG71XX_DESC_SIZE,
+ 					   &tx->descs_dma, GFP_KERNEL);
+ 	if (!tx->descs_cpu) {
+-		kfree(tx->buf);
+-		tx->buf = NULL;
+-		return -ENOMEM;
++		ret = -ENOMEM;
++		goto err_free_buf;
+ 	}
+ 
+ 	rx->buf = &tx->buf[tx_size];
+@@ -1155,7 +1155,21 @@ static int ag71xx_rings_init(struct ag71
+ 	rx->descs_dma = tx->descs_dma + tx_size * AG71XX_DESC_SIZE;
+ 
+ 	ag71xx_ring_tx_init(ag);
+-	return ag71xx_ring_rx_init(ag);
++	ret = ag71xx_ring_rx_init(ag);
++	if (ret)
++		goto err_free_dma;
++
++	return 0;
++
++err_free_dma:
++	dma_free_coherent(&ag->pdev->dev, ring_size * AG71XX_DESC_SIZE,
++			  tx->descs_cpu, tx->descs_dma);
++	rx->buf = NULL;
++err_free_buf:
++	kfree(tx->buf);
++	tx->buf = NULL;
++
++	return ret;
+ }
+ 
+ static void ag71xx_rings_free(struct ag71xx *ag)
diff --git a/target/linux/ath79/patches-5.4/201-ag71xx-Call-ag71xx_hw_disable-in-case-phy_conenct-fa.patch b/target/linux/ath79/patches-5.4/201-ag71xx-Call-ag71xx_hw_disable-in-case-phy_conenct-fa.patch
new file mode 100644
index 0000000000..16d60a4e0c
--- /dev/null
+++ b/target/linux/ath79/patches-5.4/201-ag71xx-Call-ag71xx_hw_disable-in-case-phy_conenct-fa.patch
@@ -0,0 +1,45 @@
+From 2f8c5a68d0030ae5e65fca1bf5ca44929d5b3b06 Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Mon, 17 Feb 2020 23:50:23 +0100
+Subject: [PATCH 2/3] ag71xx: Call ag71xx_hw_disable() in case phy_conenct
+ fails
+
+When the ag71xx_phy_connect() failed only parts of the actions done
+previously in this function wrere reverted, because only
+ag71xx_rings_cleanup() was called. My system crashed the next time
+open() was called because napi_disable() was not called again and this
+resulted in two calls to napi_enable(), which is not allowed.
+
+Fix this by disabling the device again.
+
+Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
+Fixes: d51b6ce441d3 ("net: ethernet: add ag71xx driver")
+---
+ drivers/net/ethernet/atheros/ag71xx.c | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+--- a/drivers/net/ethernet/atheros/ag71xx.c
++++ b/drivers/net/ethernet/atheros/ag71xx.c
+@@ -1263,18 +1263,18 @@ static int ag71xx_open(struct net_device
+ 
+ 	ret = ag71xx_hw_enable(ag);
+ 	if (ret)
+-		goto err;
++		return ret;
+ 
+ 	ret = ag71xx_phy_connect(ag);
+ 	if (ret)
+-		goto err;
++		goto err_hw_disable;
+ 
+ 	phy_start(ndev->phydev);
+ 
+ 	return 0;
+ 
+-err:
+-	ag71xx_rings_cleanup(ag);
++err_hw_disable:
++	ag71xx_hw_disable(ag);
+ 	return ret;
+ }
+ 
diff --git a/target/linux/ath79/patches-5.4/202-ag71xx-Run-ag71xx_link_adjust-only-when-needed.patch b/target/linux/ath79/patches-5.4/202-ag71xx-Run-ag71xx_link_adjust-only-when-needed.patch
new file mode 100644
index 0000000000..00f34dffa1
--- /dev/null
+++ b/target/linux/ath79/patches-5.4/202-ag71xx-Run-ag71xx_link_adjust-only-when-needed.patch
@@ -0,0 +1,69 @@
+From d42c6bf2752a46bdf3931bd6e56db419742fbb20 Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Mon, 17 Feb 2020 23:55:22 +0100
+Subject: [PATCH 3/3] ag71xx: Run ag71xx_link_adjust() only when needed
+
+My system printed this line every second:
+  ag71xx 19000000.eth eth0: Link is Up - 1Gbps/Full - flow control off
+The function ag71xx_phy_link_adjust() was called by the PHY layer every
+second even when nothing changed.
+
+With this patch the old status is stored and the real
+ag71xx_link_adjust() function is only called when when something really
+changed. This way the update and also this print is only done once any
+more.
+
+Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
+Fixes: d51b6ce441d3 ("net: ethernet: add ag71xx driver")
+---
+ drivers/net/ethernet/atheros/ag71xx.c | 24 +++++++++++++++++++++++-
+ 1 file changed, 23 insertions(+), 1 deletion(-)
+
+--- a/drivers/net/ethernet/atheros/ag71xx.c
++++ b/drivers/net/ethernet/atheros/ag71xx.c
+@@ -307,6 +307,10 @@ struct ag71xx {
+ 	u32 msg_enable;
+ 	const struct ag71xx_dcfg *dcfg;
+ 
++	unsigned int		link;
++	unsigned int		speed;
++	int			duplex;
++
+ 	/* From this point onwards we're not looking at per-packet fields. */
+ 	void __iomem *mac_base;
+ 
+@@ -854,6 +858,7 @@ static void ag71xx_link_adjust(struct ag
+ 
+ 	if (!phydev->link && update) {
+ 		ag71xx_hw_stop(ag);
++		phy_print_status(phydev);
+ 		return;
+ 	}
+ 
+@@ -907,8 +912,25 @@ static void ag71xx_link_adjust(struct ag
+ static void ag71xx_phy_link_adjust(struct net_device *ndev)
+ {
+ 	struct ag71xx *ag = netdev_priv(ndev);
++	struct phy_device *phydev = ndev->phydev;
++	int status_change = 0;
++
++	if (phydev->link) {
++		if (ag->duplex != phydev->duplex
++		    || ag->speed != phydev->speed) {
++			status_change = 1;
++		}
++	}
++
++	if (phydev->link != ag->link)
++		status_change = 1;
++
++	ag->link = phydev->link;
++	ag->duplex = phydev->duplex;
++	ag->speed = phydev->speed;
+ 
+-	ag71xx_link_adjust(ag, true);
++	if (status_change)
++		ag71xx_link_adjust(ag, true);
+ }
+ 
+ static int ag71xx_phy_connect(struct ag71xx *ag)