From: Stefan Roese <sr@denx.de>
Date: Tue, 2 Feb 2010 12:43:48 +0000 (+0100)
Subject: net: Use 0.5 sec timeout in miiphy_reset() instead of counting loop
X-Git-Tag: v2010.03-rc1~87^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ab5a0dcb9c8f19e351fc33c5db91469bfb1d9438;p=kernel%2Fu-boot.git

net: Use 0.5 sec timeout in miiphy_reset() instead of counting loop

This patch fixes a problem I've notived on a buggy PPC4xx system. This
system has problems with the PHY MDIO communication and seemed to be
stuck/crashed in miiphy_reset(). But degugging revealed, that the CPU
didn't crash, but "only" hung in this counting loop for about 2 minutes.

This patch now uses a real timeout of 0.5 seconds (as mentioned in the
comment in miiphy_reset).

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
---

diff --git a/common/miiphyutil.c b/common/miiphyutil.c
index 196ef4a..856fbc7 100644
--- a/common/miiphyutil.c
+++ b/common/miiphyutil.c
@@ -293,7 +293,7 @@ int miiphy_info (char *devname, unsigned char addr, unsigned int *oui,
 int miiphy_reset (char *devname, unsigned char addr)
 {
 	unsigned short reg;
-	int loop_cnt;
+	int timeout = 500;
 
 	if (miiphy_read (devname, addr, PHY_BMCR, &reg) != 0) {
 		debug ("PHY status read failed\n");
@@ -311,13 +311,13 @@ int miiphy_reset (char *devname, unsigned char addr)
 	 * auto-clearing).  This should happen within 0.5 seconds per the
 	 * IEEE spec.
 	 */
-	loop_cnt = 0;
 	reg = 0x8000;
-	while (((reg & 0x8000) != 0) && (loop_cnt++ < 1000000)) {
-		if (miiphy_read (devname, addr, PHY_BMCR, &reg) != 0) {
-			debug ("PHY status read failed\n");
-			return (-1);
+	while (((reg & 0x8000) != 0) && timeout--) {
+		if (miiphy_read(devname, addr, PHY_BMCR, &reg) != 0) {
+			debug("PHY status read failed\n");
+			return -1;
 		}
+		udelay(1000);
 	}
 	if ((reg & 0x8000) == 0) {
 		return (0);