4.5.0 on sun7i-a20-olinuxino-lime2: libphy: PHY stmmac-0:ffffffff not found (regression from rc7)

[Robin Murphy]

On 16/03/16 11:39, Marc Zyngier wrote:
> On 16/03/16 11:19, Bert Lindner wrote:
>> Hi,
>>
>> Hopefully this is the correct place and way to report this.
>>
>> For the board sun7i-a20-olinuxino-lime2, there seems to be a problem
>> with the eth0 PHY in mainline kernel 4.5.0 that developed since
>> 4.5.0-rc7. Ethernet does not work, although eth0 is reported:
>>
>> root at lime2-079f:~# ip a l eth0
>> 2: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group
>> default qlen 1000
>>       link/ether 02:c9:05:02:07:9f brd ff:ff:ff:ff:ff:ff
>>
>>    Difference reported in dmesg:
>>
>> 4.5.0-rc7:
>> [    9.379279] NET: Registered protocol family 10
>> [   10.217148]  RX IPC Checksum Offload disabled
>> [   10.217195]  No MAC Management Counters available
>> [   10.217627] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
>> [   15.206250] sun7i-dwmac 1c50000.ethernet eth0: Link is Up -
>> 1Gbps/Full - flow control off
>> [   15.206360] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
>>
>> 4.5.0:
>> [    9.767125] NET: Registered protocol family 10
>> [   10.357405] libphy: PHY stmmac-0:ffffffff not found
>> [   10.362382] eth0: Could not attach to PHY
>> [   10.366557] stmmac_open: Cannot attach to PHY (error: -19)
>>
>> .config is identical for both, also after make oldconfig, apart from
>> comment with version number. DTB file is also identical between the two
>> versions.
>>
>> Kernels are compiled on the board itself. /proc/version string:
>> Linux version 4.5.0-rc7 (root at lime2-079f) (gcc version 4.9.1
>> (Ubuntu/Linaro 4.9.1-16ubuntu6) ) #1 SMP Mon Mar 7 11:57:25 UTC 2016
>> Linux version 4.5.0 (root at lime2-079f) (gcc version 4.9.1 (Ubuntu/Linaro
>> 4.9.1-16ubuntu6) ) #1 SMP Tue Mar 15 11:39:01 UTC 2016
>>
>> Please let me know if more info is needed, if I should post complete
>> .config, test compile with a particular config or patch, etc. Part of
>> .config below.
>
> Can you please try reverting 88f8b1b ("stmmac: Fix 'eth0: No PHY found'
> regression") and report whether or not this changes anything? This seems
> to be the only stmac patch between -rc7 and release...

Sounds like the same thing as the giant ongoing discussion thread here:

http://thread.gmane.org/gmane.linux.drivers.devicetree/159007/focus=402830

Robin.

>
> Thanks,
>
> 	M.
>