From: Igor Plyatov <plyatov@gmail.com>
Date: Fri, 14 Aug 2015 17:11:02 +0000 (+0300)
Subject: net: phy: workaround for buggy cable detection by LAN8700 after cable plugging
X-Git-Tag: omap-for-v4.3/fixes-merge-window~77^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=776829de90c5972895db398993ddfa9417ff8b01;p=pandora-kernel.git

net: phy: workaround for buggy cable detection by LAN8700 after cable plugging

* Due to HW bug, LAN8700 sometimes does not detect presence of energy in the
  Ethernet cable in Energy Detect Power-Down mode (e.g while EDPWRDOWN bit is
  set, the ENERGYON bit does not asserted sometimes). This is a common bug of
  LAN87xx family of PHY chips.
* The lan87xx_read_status() was improved to acquire ENERGYON bit. Its previous
  algorythm still not reliable on 100 % and sometimes skip cable plugging.

Signed-off-by: Igor Plyatov <plyatov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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