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

From: Giuseppe CAVALLARO <[email-masked]>
Date: Fri, 20 May 2016 10:14:50 +0200

Hello

On 5/20/2016 9:56 AM, Marc Zyngier wrote:
> On 20/05/16 06:44, Andre Heider wrote:
>> Giuseppe, Alexandre, et al.,
>>
>> On Thu, Mar 17, 2016 at 8:52 AM, Marc Zyngier <[email-masked]> wrote:
>>> On Thu, 17 Mar 2016 00:56:40 +0100
>>> Bert Lindner <[email-masked]> wrote:
>>>> On 2016-03-16 18:42, Marc Zyngier wrote:
>>>>> On 16/03/16 15:10, Bert Lindner wrote:
>>>>>> On 2016-03-16 14:10, Andreas Färber wrote:
>>>>>>> Am 16.03.2016 um 13:09 schrieb Robin Murphy:
>>>>>>>> On 16/03/16 11:39, Marc Zyngier wrote:
>>>>>>>>> On 16/03/16 11:19, Bert Lindner wrote:
>> ...
>>>>>>>>>> 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:
>> ...
>>>>>>>>>> [    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)
>> ...
>>>>>>> v4 fixes for 4.5 are here:
>>>>>>>
>>>>>>> https://patchwork.ozlabs.org/patch/598195/ (revert)
>>>>>>> https://patchwork.ozlabs.org/patch/598196/
>> ...
>>>>> 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@lime2-079f:~# cat /proc/version
>>>> Linux version 4.5.0-598195-598196-v4 (root@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.
>>>
>>> Cool, many thanks for taking the time to test and report.
>>>
>>> Hopefully Giuseppe will get this merged quickly enough in mainline, and
>>> it should then trickle into a 4.5-stable release (cc-ing stable on
>>> these patches would probably be a good idea, BTW).
>>
>> stmmac is broken on at least Lime2, BananaPi and Cubieboard2 since
>> v4.5 [0], including all five stable releases :(
>
> All the A20 platforms are dead, actually.
>
>> The v4.5 patches quoted above are already +4 weeks old, could we
>> please get them into stable?
>
> For that, the maintainer would have needed to CC stable, which he
> didn't. I'd expect someone who cares to send these patches to stable.
> It'd be better if the maintainer would do it himself though.

sure, I can send the patches to stable (sorry if I missed to add
stable ML on CC).

Andre, I have not clear if the train of patches actually fix the
issue or if you need my support to fix something else. In that case
I need some input for debugging (e.g. kernel log).

let me know, is it enough to re-send the patches only?

Regards
Peppe

> Thanks,
> 	M.

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