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

On 16/03/16 12:09, Robin Murphy wrote:

On 16/03/16 11:39, Marc Zyngier wrote:

quoted

On 16/03/16 11:19, Bert Lindner wrote:

quoted

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

Seems related indeed. What a mess.

Bert, if you can confirm that reverting this patch solves your issue,
maybe it'd be worth shimming in in that thread, as it looks like a bunch
of systems are affected.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...