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

[Jerome Brunet <jbrunet-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>]

On Mon, 2017-07-24 at 14:26 +0200, Neil Armstrong wrote:
> 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-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.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
> > 

Same kind of test shows no issue on the libretech-cc and the khadas-vim
In this case, I don't think meson-gxl.dtsi is where you should make your change.

> > 
> > 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

This does not look like the issue we had on the odroid-c2.
However, I have seen behavior like this (link down/up flickering) when the rgmii
 delays are way off.

Maybe you could try playing with "amlogic,tx-delay-ns" property ?

> > 
> > 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

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