apm821xx: net: emac: fix fixed-link setup for the RTL8363SB switch

On the Netgear WNDAP620, the emac ethernet isn't receiving nor
xmitting any frames from/to the RTL8363SB (identifies itself
as a RTL8367RB).

This is caused by hardware not knowing the right forced link
settings (speed, duplex, pause, etc.) settings.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/apm821xx/patches-4.14/050-net-emac-fix-fixed-link-setup-for-the-RTL8363SB-swit.patch

@@ -0,0 +1,48 @@
+From 08e39982ef64f800fd1f9b9b92968d14d5fafa82 Mon Sep 17 00:00:00 2001
+From: Christian Lamparter <chunkeey@gmail.com>
+Date: Mon, 17 Sep 2018 17:22:40 +0200
+Subject: net: emac: fix fixed-link setup for the RTL8363SB switch
+
+On the Netgear WNDAP620, the emac ethernet isn't receiving nor
+xmitting any frames from/to the RTL8363SB (identifies itself
+as a RTL8367RB).
+
+This is caused by the emac hardware not knowing the forced link
+parameters for speed, duplex, pause, etc.
+
+This begs the question, how this was working on the original
+driver code, when it was necessary to set the phy_address and
+phy_map to 0xffffffff. But I guess without access to the old
+PPC405/440/460 hardware, it's not possible to know.
+
+Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/ethernet/ibm/emac/core.c | 15 ++++++++++-----
+ 1 file changed, 10 insertions(+), 5 deletions(-)
+
+--- a/drivers/net/ethernet/ibm/emac/core.c
++++ b/drivers/net/ethernet/ibm/emac/core.c
+@@ -2671,12 +2671,17 @@ static int emac_init_phy(struct emac_ins
+ 		if (of_phy_is_fixed_link(np)) {
+ 			int res = emac_dt_mdio_probe(dev);
+
+-			if (!res) {
+-				res = of_phy_register_fixed_link(np);
+-				if (res)
+-					mdiobus_unregister(dev->mii_bus);
++			if (res)
++				return res;
++
++			res = of_phy_register_fixed_link(np);
++			dev->phy_dev = of_phy_find_device(np);
++			if (res || !dev->phy_dev) {
++				mdiobus_unregister(dev->mii_bus);
++				return res ? res : -EINVAL;
+ 			}
+-			return res;
++			emac_adjust_link(dev->ndev);
++			put_device(&dev->phy_dev->mdio.dev);
+ 		}
+ 		return 0;
+ 	}

target/linux/apm821xx/patches-4.14/701-powerpc_ibm_apm82181_phyclk_fix.patch

@@ -30,7 +30,7 @@
  #endif
  }
 
-@@ -2879,6 +2888,7 @@ static int emac_init_config(struct emac_
+@@ -2884,6 +2893,7 @@ static int emac_init_config(struct emac_
  		if (of_device_is_compatible(np, "ibm,emac-apm821xx")) {
  			dev->features |= (EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE |
  					  EMAC_FTR_APM821XX_NO_HALF_DUPLEX |