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net: lan78xx: Support auto-downshift to 100Mb/s
authorPhil Elwell <phil@raspberrypi.org>
Mon, 26 Nov 2018 19:46:58 +0000 (19:46 +0000)
committerpopcornmix <popcornmix@gmail.com>
Mon, 13 May 2019 23:08:09 +0000 (00:08 +0100)
commit795fb798b7b9cf42f9376365897b956e2b24fa28
tree16ec54a1ba6b3397e1803f627e2f108173c82e31tree | snapshot
parentd4a3ea4c558d7e3ee9f002f002bd6c705f52e110commit | diff
net: lan78xx: Support auto-downshift to 100Mb/s

Ethernet cables with faulty or missing pairs (specifically pairs C and
D) allow auto-negotiation to 1000Mbs, but do not support the successful
establishment of a link. Add a DT property, "microchip,downshift-after",
to configure the number of auto-negotiation failures after which it
falls back to 100Mbs. Valid values are 2, 3, 4, 5 and 0, where 0 means
never downshift.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
drivers/net/phy/microchip.c diff | blob | history
include/linux/microchipphy.h diff | blob | history
Domain: System / Kernel; Licenses: GPL-2.0;