Based on Linux's commit:
commit 09ee9f87d02e779e4fc3f5c29212c733d6d6e349
Author: Michael Abbott <michael.abbott@diamond.ac.uk>
Date: Wed Oct 16 11:41:33 2013 +0300
dm9000: Implement full reset of DM9000 network device
A Davicom application note for the DM9000 network device recommends
performing software reset twice to correctly initialise the device.
Without this reset some devices fail to initialise correctly on
system startup.
N.B. DM9000B on MIPS Creator CI20 board needs additional workaround
(see the 'Make all GPIO pins outputs' and 'Power internal PHY' lines).
This workaround was taken from this U-boot's commit:
commit fbcb7ece0ea1e364180f1cf963e0fa0ce7f6560d
Author: Remy Bohmer <linux@bohmer.net>
Date: Tue Jun 3 15:26:24 2008 +0200
DM9000: Improve eth_reset() routine
According to the application notes of the DM9000 v1.22 chapter 5.2 bullet 2, the
reset procedure must be done twice to properly reset the DM9000 by means of software.
This errata is not needed anymore for the DM9000A, but it does not bother it.
This change has been tested with DM9000A, DM9000E, DM9000EP.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
92f9b36fc0