generic: make chip detection more reliable in the AR8216 driver

Fixes broken ethernet on the Planex MZK-W04NU/W300NH boards.

Cc: bacfire@openwrt.org
SVN-Revision: 20753

diff --git a/target/linux/generic-2.6/files/drivers/net/phy/ar8216.c b/target/linux/generic-2.6/files/drivers/net/phy/ar8216.c
index 394e50d479562d19e585fcba146ea4fa85095fca..a473e3b18169ebe16bf1d84f6508a1dec3b83342 100644 (file)
--- a/target/linux/generic-2.6/files/drivers/net/phy/ar8216.c
+++ b/target/linux/generic-2.6/files/drivers/net/phy/ar8216.c
@@ -33,6 +33,7 @@
 
 /* size of the vlan table */
 #define AR8X16_MAX_VLANS       128
+#define AR8X16_PROBE_RETRIES   10
 
 struct ar8216_priv {
        struct switch_dev dev;
@@ -119,8 +120,25 @@ ar8216_id_chip(struct ar8216_priv *priv)
 {
        u32 val;
        u16 id;
+       int i;
+
        val = ar8216_mii_read(priv, AR8216_REG_CTRL);
+       if (val == ~0)
+               return UNKNOWN;
+
        id = val & (AR8216_CTRL_REVISION | AR8216_CTRL_VERSION);
+       for (i = 0; i < AR8X16_PROBE_RETRIES; i++) {
+               u16 t;
+
+               val = ar8216_mii_read(priv, AR8216_REG_CTRL);
+               if (val == ~0)
+                       return UNKNOWN;
+
+               t = val & (AR8216_CTRL_REVISION | AR8216_CTRL_VERSION);
+               if (t != id)
+                       return UNKNOWN;
+       }
+
        switch (id) {
        case 0x0101:
                return AR8216;
@@ -736,11 +754,13 @@ static int
 ar8216_probe(struct phy_device *pdev)
 {
        struct ar8216_priv priv;
+       u16 chip;
 
        priv.phy = pdev;
-       if (ar8216_id_chip(&priv) == UNKNOWN) {
+       chip = ar8216_id_chip(&priv);
+       if (chip == UNKNOWN)
                return -ENODEV;
-       }
+
        return 0;
 }