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| author |   Patrick Trantham <patrick.trantham@fuel7.com> | 2012-11-15 09:00:57 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-11-15 17:48:50 -0500 |
| commit | 4223dbffed9f89596177ff2b256ef3258b20fa46 (patch) | |
| tree | 6472e1dbeaca62e74929aa613afe98527b1086e5 /net/sctp/tsnmap.c | |
| parent | net: Remove code duplication between offload structures (diff) | |
| download | wireguard-linux-4223dbffed9f89596177ff2b256ef3258b20fa46.tar.xz wireguard-linux-4223dbffed9f89596177ff2b256ef3258b20fa46.zip | |
net: phy: smsc: Re-enable EDPD mode for LAN87xx
This patch re-enables Energy Detect Power Down (EDPD) mode for the
LAN8710/LAN8720. EDPD mode was disabled in a previous commit,
(b629820d18fa65cc598390e4b9712fd5f83ee693), because it was causing the
PHY to not be able to detect a link when cold started without a cable
connected.
The LAN8710/LAN8720 requires a minimum of 2 link pulses within 64ms of
each other in order to set the ENERGYON bit and exit EDPD mode. If a
link partner does send the pulses within this interval, the PHY will
remained powered down.
This workaround will manually toggle the PHY on/off upon calls to
read_status in order to generate link test pulses if the link is down.
If a link partner is present, it will respond to the pulses, which will
cause the ENERGYON bit to be set and will cause the EDPD mode to be
exited.
Signed-off-by: Patrick Trantham <patrick.trantham@fuel7.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/tsnmap.c')
0 files changed, 0 insertions, 0 deletions