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Subject[PATCH] net: phy: micrel: disable NAND-tree for KSZ8021,KSZ8031,KSZ8051,KSZ8081
NAND-tree is used to check wiring between MAC and PHY using NAND gates
on the PHY side, hence the name.

NAND-tree initial status is latched at reset by probing the IRQ pin.
However some devices are sharing the PHY IRQ pin with other peripherals
such as Atmel SAMA5D[34]x-EK boards when using the optional TM7000
display module, therefore they are switching the PHY in NAND-tree test
mode depending on the current IRQ line status at reset.

This patch ensure PHY is not in NAND-tree test mode for all Micrel PHYs
using IRQ line as a NAND-tree toggle mode at reset.

Signed-off-by: Sylvain Rochet <sylvain.rochet@finsecur.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
drivers/net/phy/micrel.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 3ad8ca7..1190fd8 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -32,6 +32,7 @@
/* Operation Mode Strap Override */
#define MII_KSZPHY_OMSO 0x16
#define KSZPHY_OMSO_B_CAST_OFF BIT(9)
+#define KSZPHY_OMSO_NAND_TREE_ON BIT(5)
#define KSZPHY_OMSO_RMII_OVERRIDE BIT(1)
#define KSZPHY_OMSO_MII_OVERRIDE BIT(0)

@@ -76,6 +77,7 @@ struct kszphy_type {
u32 led_mode_reg;
u16 interrupt_level_mask;
bool has_broadcast_disable;
+ bool has_nand_tree_disable;
bool has_rmii_ref_clk_sel;
};

@@ -89,6 +91,7 @@ struct kszphy_priv {
static const struct kszphy_type ksz8021_type = {
.led_mode_reg = MII_KSZPHY_CTRL_2,
.has_broadcast_disable = true,
+ .has_nand_tree_disable = true,
.has_rmii_ref_clk_sel = true,
};

@@ -98,11 +101,13 @@ static const struct kszphy_type ksz8041_type = {

static const struct kszphy_type ksz8051_type = {
.led_mode_reg = MII_KSZPHY_CTRL_2,
+ .has_nand_tree_disable = true,
};

static const struct kszphy_type ksz8081_type = {
.led_mode_reg = MII_KSZPHY_CTRL_2,
.has_broadcast_disable = true,
+ .has_nand_tree_disable = true,
.has_rmii_ref_clk_sel = true,
};

@@ -231,6 +236,26 @@ out:
return ret;
}

+static int kszphy_nand_tree_disable(struct phy_device *phydev)
+{
+ int ret;
+
+ ret = phy_read(phydev, MII_KSZPHY_OMSO);
+ if (ret < 0)
+ goto out;
+
+ if (!(ret & KSZPHY_OMSO_NAND_TREE_ON))
+ return 0;
+
+ ret = phy_write(phydev, MII_KSZPHY_OMSO,
+ ret & ~KSZPHY_OMSO_NAND_TREE_ON);
+out:
+ if (ret)
+ dev_err(&phydev->dev, "failed to disable NAND tree mode\n");
+
+ return ret;
+}
+
static int kszphy_config_init(struct phy_device *phydev)
{
struct kszphy_priv *priv = phydev->priv;
@@ -245,6 +270,9 @@ static int kszphy_config_init(struct phy_device *phydev)
if (type->has_broadcast_disable)
kszphy_broadcast_disable(phydev);

+ if (type->has_nand_tree_disable)
+ kszphy_nand_tree_disable(phydev);
+
if (priv->rmii_ref_clk_sel) {
ret = kszphy_rmii_clk_sel(phydev, priv->rmii_ref_clk_sel_val);
if (ret) {
--
2.1.4


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