MPC8360 QE UCC ethernet controllers hang when changing link duplex
under a load (a bit of NFS activity is enough).
PHY: m...@e0102120:00 - Link is Up - 1000/Full
sh-3.00# ethtool -s eth0 speed 100 duplex half autoneg off
PHY: m...@e0102120:00 - Link is Down
PHY: m...@e0102120:00 - Link is Up - 100/Half
NETDEV WATCHDOG: eth0 (ucc_geth): transmit queue 0 timed out
------------[ cut here ]------------
Badness at c01fcbd0 [verbose debug info unavailable]
NIP: c01fcbd0 LR: c01fcbd0 CTR: c0194e44
...
The cure is to disable the controller before changing speed/duplex
and enable it afterwards.
Signed-off-by: Anton Vorontsov <avoront...@ru.mvista.com>
---
drivers/net/ucc_geth.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/drivers/net/ucc_geth.c b/drivers/net/ucc_geth.c
index 2a2c973..9ad9015 100644
--- a/drivers/net/ucc_geth.c
+++ b/drivers/net/ucc_geth.c
@@ -1631,9 +1631,13 @@ static void adjust_link(struct net_device *dev)
ugeth->oldspeed = phydev->speed;
}
+ ugeth_disable(ugeth, COMM_DIR_RX_AND_TX);
+
out_be32(&ug_regs->maccfg2, tempval);
out_be32(&uf_regs->upsmr, upsmr);
+ ugeth_enable(ugeth, COMM_DIR_RX_AND_TX);
+
if (!ugeth->oldlink) {
new_state = 1;
ugeth->oldlink = 1;
--
1.6.3.3
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