kernel: improve driver support for gen-3 Aquantia Ethernet PHYs

 * correctly set system side interface, the original patch was
   errornous and there is a follow-up fix for it
 * enable phy statistics for AQR112(+R/C) and ARQ412
   (ethtool --phy-statistics ethX)

Tested, including phy-statistics, on
 - IEI Puzzle M901 (AQR112, AQR112C, AQR112R)
 - IEI Puzzle M902 (AQR113, AQR112R)
 - Ubiquiti UniFi 6 LR (AQR112C)

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/target/linux/generic/hack-5.10/723-net-phy-aquantia-fix-system-side-protocol-mi.patch b/target/linux/generic/hack-5.10/723-net-phy-aquantia-fix-system-side-protocol-mi.patch
new file mode 100644
index 0000000000..9c5df905bb
--- /dev/null
+++ b/target/linux/generic/hack-5.10/723-net-phy-aquantia-fix-system-side-protocol-mi.patch
@@ -0,0 +1,34 @@
+From 5f008cb22f60da4e10375f22266c1a4e20b1252e Mon Sep 17 00:00:00 2001
+From: Alex Marginean <alexandru.marginean@nxp.com>
+Date: Fri, 20 Sep 2019 18:22:52 +0300
+Subject: [PATCH] drivers: net: phy: aquantia: fix system side protocol
+ misconfiguration
+
+Do not set up protocols for speeds that are not supported by FW.  Enabling
+these protocols leads to link issues on system side.
+
+Signed-off-by: Alex Marginean <alexandru.marginean@nxp.com>
+---
+ drivers/net/phy/aquantia_main.c | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+--- a/drivers/net/phy/aquantia_main.c
++++ b/drivers/net/phy/aquantia_main.c
+@@ -301,10 +301,16 @@ static int aqr_config_aneg_set_prot(stru
+ 	phy_write_mmd(phydev, MDIO_MMD_VEND1, AQUANTIA_VND1_GSTART_RATE,
+ 		      aquantia_syscfg[if_type].start_rate);
+ 
+-	for (i = 0; i <= aquantia_syscfg[if_type].cnt; i++)
++	for (i = 0; i <= aquantia_syscfg[if_type].cnt; i++) {
++		u16 reg = phy_read_mmd(phydev, MDIO_MMD_VEND1,
++				       AQUANTIA_VND1_GSYSCFG_BASE + i);
++		if (!reg)
++			continue;
++
+ 		phy_write_mmd(phydev, MDIO_MMD_VEND1,
+ 			      AQUANTIA_VND1_GSYSCFG_BASE + i,
+ 			      aquantia_syscfg[if_type].syscfg);
++	}
+ 
+ 	/* wake PHY back up */
+ 	phy_write_mmd(phydev, MDIO_MMD_VEND1, AQUANTIA_VND1_GLOBAL_SC, 0);