net: phy: dp83867: w/a for fld detect threshold bootstrapping issue

When the DP83867 PHY is strapped to enable Fast Link Drop (FLD) feature
STRAP_STS2.STRAP_ FLD (reg 0x006F bit 10), the Energy Lost Threshold for
FLD Energy Lost Mode FLD_THR_CFG.ENERGY_LOST_FLD_THR (reg 0x002e bits 2:0)
will be defaulted to 0x2. This may cause the phy link to be unstable. The
new DP83867 DM recommends to always restore ENERGY_LOST_FLD_THR to 0x1.

Hence, restore default value of FLD_THR_CFG.ENERGY_LOST_FLD_THR to 0x1 when
FLD is enabled by bootstrapping as recommended by DM.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
index 967f57e..9a07ad1 100644 (file)
--- a/drivers/net/phy/dp83867.c
+++ b/drivers/net/phy/dp83867.c
@@ -28,7 +28,8 @@
 #define DP83867_CTRL           0x1f
 
 /* Extended Registers */
-#define DP83867_CFG4            0x0031
+#define DP83867_FLD_THR_CFG    0x002e
+#define DP83867_CFG4           0x0031
 #define DP83867_CFG4_SGMII_ANEG_MASK (BIT(5) | BIT(6))
 #define DP83867_CFG4_SGMII_ANEG_TIMER_11MS   (3 << 5)
 #define DP83867_CFG4_SGMII_ANEG_TIMER_800US  (2 << 5)
@@ -91,6 +92,7 @@
 #define DP83867_STRAP_STS2_CLK_SKEW_RX_MASK    GENMASK(2, 0)
 #define DP83867_STRAP_STS2_CLK_SKEW_RX_SHIFT   0
 #define DP83867_STRAP_STS2_CLK_SKEW_NONE       BIT(2)
+#define DP83867_STRAP_STS2_STRAP_FLD           BIT(10)
 
 /* PHY CTRL bits */
 #define DP83867_PHYCR_TX_FIFO_DEPTH_SHIFT      14
@@ -125,6 +127,9 @@
 /* CFG4 bits */
 #define DP83867_CFG4_PORT_MIRROR_EN              BIT(0)
 
+/* FLD_THR_CFG */
+#define DP83867_FLD_THR_CFG_ENERGY_LOST_THR_MASK       0x7
+
 enum {
        DP83867_PORT_MIRROING_KEEP,
        DP83867_PORT_MIRROING_EN,
@@ -476,6 +481,20 @@ static int dp83867_config_init(struct phy_device *phydev)
                phy_clear_bits_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4,
                                   BIT(7));
 
+       bs = phy_read_mmd(phydev, DP83867_DEVADDR, DP83867_STRAP_STS2);
+       if (bs & DP83867_STRAP_STS2_STRAP_FLD) {
+               /* When using strap to enable FLD, the ENERGY_LOST_FLD_THR will
+                * be set to 0x2. This may causes the PHY link to be unstable -
+                * the default value 0x1 need to be restored.
+                */
+               ret = phy_modify_mmd(phydev, DP83867_DEVADDR,
+                                    DP83867_FLD_THR_CFG,
+                                    DP83867_FLD_THR_CFG_ENERGY_LOST_THR_MASK,
+                                    0x1);
+               if (ret)
+                       return ret;
+       }
+
        if (phy_interface_is_rgmii(phydev) ||
            phydev->interface == PHY_INTERFACE_MODE_SGMII) {
                val = phy_read(phydev, MII_DP83867_PHYCTRL);