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author | Felix Fietkau <nbd@openwrt.org> | 2014-09-07 09:45:32 +0000 |
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committer | Felix Fietkau <nbd@openwrt.org> | 2014-09-07 09:45:32 +0000 |
commit | 60b81acd602496d9b929d680c78b387d06b80ed1 (patch) | |
tree | b86a1dd7080a4909e6e45f818d24b8393daa6692 /include | |
parent | 288e50a79ced282f4396d42bb0c21cecd6e2e31e (diff) | |
download | upstream-60b81acd602496d9b929d680c78b387d06b80ed1.tar.gz upstream-60b81acd602496d9b929d680c78b387d06b80ed1.tar.bz2 upstream-60b81acd602496d9b929d680c78b387d06b80ed1.zip |
ath79: dev-eth: Don't advertise 1gbit in link code word on ar9331
While the AR9331 has a gigabit MAC towards the internal switch, the
integrated PHYs however are only 100-base-tx capable. The existing code
however advertieses gigabit capability in the link status word. If you
attach such a PHY to a gigabit capable switch on the remote end, with
some probability it attempts to negotiate gigabit and fails, falling
baco to the AR9331 assuming a 10mbit half-duplex link. This has been
observed quite frequently with the Carambola2 and gigabit capable
switches.
In ath79_register_eth(), "pdata->has_gbit = 1;" is set unconditionally
for both AR9331 ethernet ports. This is most likely wrong. Despite the
two MAC IP cores being gigabit MACs, the MAC for eth1 is connected to a
100base-T PHY via MII. The has_gbit attribute is used in the ethernet
driver to determine the supported link modes.
So either pdata->has_gbit is not set to 1 anymore, or the ethernet
driver needs to be modified to determine the advertised link code word
on another criteria than pdata->has_gbit. This patch implements the
former solution.
Signed-off-by: Harald Welte <laforge@gnumonks.org>
SVN-Revision: 42432
Diffstat (limited to 'include')
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