diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0129-net-lan78xx-Support-auto-downshift-to-100Mb-s.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0129-net-lan78xx-Support-auto-downshift-to-100Mb-s.patch | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0129-net-lan78xx-Support-auto-downshift-to-100Mb-s.patch b/target/linux/bcm27xx/patches-5.4/950-0129-net-lan78xx-Support-auto-downshift-to-100Mb-s.patch new file mode 100644 index 0000000000..510218ecf9 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0129-net-lan78xx-Support-auto-downshift-to-100Mb-s.patch @@ -0,0 +1,91 @@ +From d205110391b7a85af9d45d4e634f1e5595c0a518 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> +--- + .../bindings/net/microchip,lan78xx.txt | 3 +++ + drivers/net/phy/microchip.c | 27 +++++++++++++++++++ + include/linux/microchipphy.h | 8 ++++++ + 3 files changed, 38 insertions(+) + +--- a/Documentation/devicetree/bindings/net/microchip,lan78xx.txt ++++ b/Documentation/devicetree/bindings/net/microchip,lan78xx.txt +@@ -14,6 +14,9 @@ Optional properties of the embedded PHY: + - microchip,led-modes: a 0..4 element vector, with each element configuring + the operating mode of an LED. Omitted LEDs are turned off. Allowed values + are defined in "include/dt-bindings/net/microchip-lan78xx.h". ++- microchip,downshift-after: sets the number of failed auto-negotiation ++ attempts after which the link is downgraded from 1000BASE-T. Should be one of ++ 2, 3, 4, 5 or 0, where 0 means never downshift. + + Example: + +--- a/drivers/net/phy/microchip.c ++++ b/drivers/net/phy/microchip.c +@@ -217,6 +217,7 @@ 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); +@@ -246,6 +247,32 @@ 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 +@@ -61,6 +61,14 @@ + /* 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) |