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

On 2016-03-16 18:42, Marc Zyngier wrote:

On 16/03/16 15:10, Bert Lindner wrote:

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On 2016-03-16 14:10, Andreas F?rber wrote:

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Am 16.03.2016 um 13:09 schrieb Robin Murphy:

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

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

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Hopefully this is the correct place and way to report this.

The main discussion is on netdev list actually, CC'ed.

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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

v4 fixes for 4.5 are here:

https://patchwork.ozlabs.org/patch/598195/ (revert)
https://patchwork.ozlabs.org/patch/598196/

v2 fixes for linux-next here:

https://patchwork.ozlabs.org/patch/598331/ (revert)
https://patchwork.ozlabs.org/patch/598332/

Please let Peppe know whether they work for you guys.

Hi guys - I can confirm 4.5.0 minus 88f8b1b works for me:

root at lime2-079f:~# cat /proc/version
Linux version 4.5.0-minus-88f8b1b (root at lime2-079f) (gcc version 4.9.1
(Ubuntu/Linaro 4.9.1-16ubuntu6) ) #2 SMP Wed Mar 16 12:50:03 UTC 2016

  From dmesg output:
[    9.731730] NET: Registered protocol family 10
[   10.516893]  RX IPC Checksum Offload disabled
[   10.516948]  No MAC Management Counters available
[   10.517374] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   15.505548] sun7i-dwmac 1c50000.ethernet eth0: Link is Up -
1Gbps/Full - flow control off
[   15.505660] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

.. and connected over ethernet.

Good to know, thanks. Could you also give the potential fix a go (as
mentioned by Andreas)? Just to make sure that whatever gets merged next
will actually fix the issue.

Yes sure, it took a while because I had to travel. Confirmed, the 
v4-for-4.5 fix works well for me, on sun7i-a20-olinuxino-lime2:

root at lime2-079f:~# cat /proc/version
Linux version 4.5.0-598195-598196-v4 (root at lime2-079f) (gcc version 
4.9.1 (Ubuntu/Linaro 4.9.1-16ubuntu6) ) #1 SMP Wed Mar 16 16:44:22 UTC 2016

dmesg:
[    8.245273] NET: Registered protocol family 10
[    9.297406]  RX IPC Checksum Offload disabled
[    9.297460]  No MAC Management Counters available
[    9.297951] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   16.285658] sun7i-dwmac 1c50000.ethernet eth0: Link is Up - 
1Gbps/Full - flow control rx/tx
[   16.285798] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

The board is connected to my laptop rather than to a switch, so that 
might be where the flow control message comes from (not sure). Anyway 
ethernet works.

I'm less familiar with linux-next - not sure what base to test against, 
I understand it is being redefined almost daily.

Thanks!

	-Bert