From: juhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Fri, 9 Apr 2010 12:06:17 +0000 (+0000)
Subject: backfire: generic: make chip detection more reliable in the AR8216 driver (backport... 
X-Git-Url: http://git.ozo.com/?p=openwrt-10.03%2F.git;a=commitdiff_plain;h=c2d7208f8a3d0498fe8f6f1413a8a122a5fd3316

backfire: generic: make chip detection more reliable in the AR8216 driver (backport of r20753)

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


git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@20762 3c298f89-4303-0410-b956-a3cf2f4a3e73
---

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 394e50d47..a473e3b18 100644
--- 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;
 }