This patch fixes several issues at least on a MPC885 based system with two
FEC interfaces used in MII mode.
1. PHY discovery should first read PHY_PHYIDR2 register and only then
PHY_PHYIDR1 like cpu/mpc8xx/fec.c::mii_discover_phy() does it,
otherwise the values read are wrong. Also notice, that PHY discovery
cannot work on MPC88x / MPC87x in setups with both FECs active at all
in its present form, because for both interfaces the registers from FEC
1 are used to communicate over MII.
2. Remove code duplication for resetting the FEC by isolating it into a
separate function.
3. Initialize MII on FEC 1 when communicating over FEC 2 in fec_init().
4. Optimize mii_init() to only reset the FEC 1 controller once.
5. Fix a typo in mii_init() using index i instead of j thus potentially
leading to unpredictable results.
Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
d197ffd817