[U-Boot] [PATCH] net: Use 0.5 sec timeout in miiphy_reset() instead of counting loop
Stefan Roese
sr at denx.de
Tue Feb 2 13:43:48 CET 2010
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 at denx.de>
Cc: Ben Warren <biggerbadderben at gmail.com>
---
common/miiphyutil.c | 12 ++++++------
1 files changed, 6 insertions(+), 6 deletions(-)
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, ®) != 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, ®) != 0) {
- debug ("PHY status read failed\n");
- return (-1);
+ while (((reg & 0x8000) != 0) && timeout--) {
+ if (miiphy_read(devname, addr, PHY_BMCR, ®) != 0) {
+ debug("PHY status read failed\n");
+ return -1;
}
+ udelay(1000);
}
if ((reg & 0x8000) == 0) {
return (0);
--
1.6.6.1
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