X-Git-Url: http://git.openwrt.org/?a=blobdiff_plain;f=target%2Flinux%2Fbrcm2708%2Fpatches-4.19%2F950-0193-net-lan78xx-Support-auto-downshift-to-100Mb-s.patch;fp=target%2Flinux%2Fbrcm2708%2Fpatches-4.19%2F950-0193-net-lan78xx-Support-auto-downshift-to-100Mb-s.patch;h=c67acaa50da26f2d80742a07550473d2be2a9c23;hb=c2308a7e4adbb2acc8ff149f91d1ca46801c135e;hp=0000000000000000000000000000000000000000;hpb=67dcc43f3a22dc3a7ac07a7065971b426feeb043;p=openwrt%2Fstaging%2Fwigyori.git

diff --git a/target/linux/brcm2708/patches-4.19/950-0193-net-lan78xx-Support-auto-downshift-to-100Mb-s.patch b/target/linux/brcm2708/patches-4.19/950-0193-net-lan78xx-Support-auto-downshift-to-100Mb-s.patch
new file mode 100644
index 0000000000..c67acaa50d
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0193-net-lan78xx-Support-auto-downshift-to-100Mb-s.patch
@@ -0,0 +1,83 @@
+From a3c59bad71de2b3c09a25fd6ce5e3632c33c4bba Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Mon, 26 Nov 2018 19:46:58 +0000
+Subject: [PATCH] net: lan78xx: Support auto-downshift to 100Mb/s
+
+Ethernet cables with faulty or missing pairs (specifically pairs C and
+D) allow auto-negotiation to 1000Mbs, but do not support the successful
+establishment of a link. Add a DT property, "microchip,downshift-after",
+to configure the number of auto-negotiation failures after which it
+falls back to 100Mbs. Valid values are 2, 3, 4, 5 and 0, where 0 means
+never downshift.
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ drivers/net/phy/microchip.c  | 32 ++++++++++++++++++++++++++++++++
+ include/linux/microchipphy.h |  8 ++++++++
+ 2 files changed, 40 insertions(+)
+
+--- a/drivers/net/phy/microchip.c
++++ b/drivers/net/phy/microchip.c
+@@ -228,6 +228,7 @@ static int lan88xx_probe(struct phy_devi
+ 	struct device *dev = &phydev->mdio.dev;
+ 	struct lan88xx_priv *priv;
+ 	u32 led_modes[4];
++	u32 downshift_after = 0;
+ 	int len;
+ 
+ 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+@@ -257,6 +258,37 @@ static int lan88xx_probe(struct phy_devi
+ 		return -EINVAL;
+ 	}
+ 
++	if (!of_property_read_u32(dev->of_node,
++				  "microchip,downshift-after",
++				  &downshift_after)) {
++		u32 mask = LAN78XX_PHY_CTRL3_DOWNSHIFT_CTRL_MASK;
++		u32 val = LAN78XX_PHY_CTRL3_AUTO_DOWNSHIFT;
++
++		switch (downshift_after) {
++		case 2:
++			val |= LAN78XX_PHY_CTRL3_DOWNSHIFT_CTRL_2;
++			break;
++		case 3:
++			val |= LAN78XX_PHY_CTRL3_DOWNSHIFT_CTRL_3;
++			break;
++		case 4:
++			val |= LAN78XX_PHY_CTRL3_DOWNSHIFT_CTRL_4;
++			break;
++		case 5:
++			val |= LAN78XX_PHY_CTRL3_DOWNSHIFT_CTRL_5;
++			break;
++		case 0:
++			/* Disable completely */
++			mask = LAN78XX_PHY_CTRL3_AUTO_DOWNSHIFT;
++			val = 0;
++			break;
++		default:
++			return -EINVAL;
++		}
++		(void)phy_modify_paged(phydev, 1, LAN78XX_PHY_CTRL3,
++				       mask, val);
++	}
++
+ 	/* these values can be used to identify internal PHY */
+ 	priv->chip_id = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_ID);
+ 	priv->chip_rev = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_REV);
+--- a/include/linux/microchipphy.h
++++ b/include/linux/microchipphy.h
+@@ -73,6 +73,14 @@
+ /* Registers specific to the LAN7800/LAN7850 embedded phy */
+ #define LAN78XX_PHY_LED_MODE_SELECT		(0x1D)
+ 
++#define LAN78XX_PHY_CTRL3			(0x14)
++#define LAN78XX_PHY_CTRL3_AUTO_DOWNSHIFT	(0x0010)
++#define LAN78XX_PHY_CTRL3_DOWNSHIFT_CTRL_MASK	(0x000c)
++#define LAN78XX_PHY_CTRL3_DOWNSHIFT_CTRL_2	(0x0000)
++#define LAN78XX_PHY_CTRL3_DOWNSHIFT_CTRL_3	(0x0004)
++#define LAN78XX_PHY_CTRL3_DOWNSHIFT_CTRL_4	(0x0008)
++#define LAN78XX_PHY_CTRL3_DOWNSHIFT_CTRL_5	(0x000c)
++
+ /* DSP registers */
+ #define PHY_ARDENNES_MMD_DEV_3_PHY_CFG		(0x806A)
+ #define PHY_ARDENNES_MMD_DEV_3_PHY_CFG_ZD_DLY_EN_	(0x2000)