[PATCH] ARM64: meson-gxl: disable broken eee

[Neil Armstrong]

On 07/24/2017 02:06 PM, Neil Armstrong wrote:
> On 07/23/2017 07:03 PM, Joseph Kogut wrote:
>> Hi Kevin,
>>
>> I tested on a P212 reference board, which is currently the only GXL
>> based board I have.
>>
>> Before applying the patch, high activity on the ethernet interface
>> would cause the link to break, requiring the interface to be brought
>> down and back up before it would work again. After applying the patch,
>> I could not get the link to break with any transfers.
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel at lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>>
> 
> Hi Joseph,
> 
> [please keep the history of the conversation when replying]
> 
> Is it a original P212 board, or a board based on the P212 ref design ?
> 
> I'm currently testing the v4.13-rc2 on the official P212 board we received from Amlogic
> and using iperf3 in both directions, I have an issue after a few minutes running iperf3 with :
> 
> # while true ; do iperf3 -c 192.168.1.21 ; iperf3 -c 192.168.1.21 -R ; done
> 
> That cycles between the two iperf directions.
> 
> After a few minutes, it stalls with :
> 
> Connecting to host 192.168.1.21, port 5201
> [  4] local 192.168.1.183 port 51286 connected to 192.168.1.21 port 5201
> [ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
> [  4]   0.00-1.00   sec  1.64 MBytes  13.7 Mbits/sec    2   1.41 KBytes
> [  4]   1.00-2.00   sec  0.00 Bytes  0.00 bits/sec    1   1.41 KBytes
> [  4]   2.00-3.00   sec  0.00 Bytes  0.00 bits/sec    0   1.41 KBytes
> [  4]   3.00-4.00   sec  0.00 Bytes  0.00 bits/sec    1   1.41 KBytes
> [  4]   4.00-5.00   sec  0.00 Bytes  0.00 bits/sec    0   1.41 KBytes
> [  4]   5.00-6.00   sec  0.00 Bytes  0.00 bits/sec    0   1.41 KBytes
> [  4]   6.00-7.00   sec  0.00 Bytes  0.00 bits/sec    1   1.41 KBytes
> [  4]   7.00-8.00   sec  0.00 Bytes  0.00 bits/sec    0   1.41 KBytes
> [  4]   8.00-9.00   sec  0.00 Bytes  0.00 bits/sec    0   1.41 KBytes
> 
> 
> And then, after:
> # ifconfig eth0 down
> # ifconfig eth0 up
> 
> It cycles between :
> [ 1483.009919] meson8b-dwmac c9410000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
> [ 1487.105725] meson8b-dwmac c9410000.ethernet eth0: Link is Down
> [ 1490.177943] meson8b-dwmac c9410000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
> [ 1494.273713] meson8b-dwmac c9410000.ethernet eth0: Link is Down
> 
> and so on.
> 
> And this patch does not fix this at all.
> 
> It seems to be more a PHY driver issue here.
> 
> Could you share the results with the same command ?
> 
> Neil
> 

I forgot to precise, this issue occurs when the "GXL PHY driver" is disabled, only relying on the
Generic PHY Driver.

[  630.767538] Generic PHY 0.e40908ff:08: attached PHY driver [Generic PHY] (mii_bus:phy_addr=0.e40908ff:08, irq=-1)


When the PHY driver is loaded the issue disappears, with and without your patch.

[   25.355620] Meson GXL Internal PHY 0.e40908ff:08: attached PHY driver [Meson GXL Internal PHY] (mii_bus:phy_addr=0.e40908ff:08, irq=-1)

Could you please check the PHY Driver is loaded ?

Thanks,
Neil