net: sh_eth: do not advertise Gigabit capabilities when not available

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Not all variants of the sh_eth hardware have Gigabit
support. Unfortunately, the current driver doesn't tell the PHY about
the limited MAC capabilities. Due to this, if you have a Gigabit
capable PHY, the PHY will advertise its Gigabit capability and
establish a link at 1Gbit/s, even though the MAC doesn't support it.

In order to avoid this, we use the recently introduced
phy_set_max_speed() to tell the PHY to not advertise speed higher than
100 MBit/s.

Tested on a SH7786 platform, with a Gigabit PHY.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Thomas Petazzoni 2017-12-08 16:35:40 +01:00 • committed by David S. Miller

parent f1e2400a80

commit 2aab6b40b0

1 changed files with 10 additions and 0 deletions

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drivers/net/ethernet/renesas/sh_eth.c

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