netdev - Re: "asix: Don't reset PHY on if_up for ASIX 88772" breaks net on arndale platform

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Date:	Tue, 4 Nov 2014 11:43:36 +0200
From:	Riku Voipio <riku.voipio@....fi>
To:	"Stam, Michel [FINT]" <M.Stam@...ro.nl>
Cc:	Riku Voipio <riku.voipio@....fi>, davem@...emloft.net,
	linux-usb@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	ckeepax@...nsource.wolfsonmicro.com
Subject: Re: "asix: Don't reset PHY on if_up for ASIX 88772" breaks net on
 arndale platform

On Tue, Nov 04, 2014 at 09:19:26AM +0100, Stam, Michel [FINT] wrote:
> Interesting, as the commit itself is a revert from a kernel back to 2.6
> somewhere. The problem I had is related to the PHY being reset on
> interface-up, can you confirm that you require this?

I can't confirm what exactly is needed on arndale. I'm neither expert in 
USB or ethernet. However, I can confirm that without the PHY reset,
networking doesn't work on arndale.

I now see someone else has the same problem, adding Charles to CC.

http://www.spinics.net/lists/linux-usb/msg116656.html

> Reverting this
> breaks ethtool support in turn.

Fixing a bug (ethtool support) must not cause breakage elsewhere (in
this case on arndale). This is now a regression of functionality from
3.17.

I think it would better to revert the change now and with less hurry
introduce a ethtool fix that doesn't break arndale.
 
> Kind regards,
> 
> Michel Stam
> 
> -----Original Message-----
> From: Riku Voipio [mailto:riku.voipio@....fi] 
> Sent: Tuesday, November 04, 2014 8:23 AM
> To: davem@...emloft.net; Stam, Michel [FINT]
> Cc: linux-usb@...r.kernel.org; netdev@...r.kernel.org;
> linux-kernel@...r.kernel.org; linux-samsung-soc@...r.kernel.org
> Subject: "asix: Don't reset PHY on if_up for ASIX 88772" breaks net on
> arndale platform
> 
> Hi,
> 
> With 3.18-rc3, asix on arndale (samsung exynos 5250 based board), fails
> to work. Interface is initialized but network traffic seem not to pass
> through. With kernel IP config the result looks like:
> 
> [    3.323275] usb 3-3.2.4: new high-speed USB device number 4 using
> exynos-ehci
> [    3.419151] usb 3-3.2.4: New USB device found, idVendor=0b95,
> idProduct=772a
> [    3.424735] usb 3-3.2.4: New USB device strings: Mfr=1, Product=2,
> SerialNumber=3
> [    3.432196] usb 3-3.2.4: Product: AX88772 
> [    3.436279] usb 3-3.2.4: Manufacturer: ASIX Elec. Corp.
> [    3.441486] usb 3-3.2.4: SerialNumber: 000001
> [    3.447530] asix 3-3.2.4:1.0 (unnamed net_device) (uninitialized):
> invalid hw address, using random
> [    3.764352] asix 3-3.2.4:1.0 eth0: register 'asix' at
> usb-12110000.usb-3.2.4, ASIX AX88772 USB 2.0 Ethernet, de:a2:66:bf:ca:4f
> [    4.488773] asix 3-3.2.4:1.0 eth0: link down
> [    5.690025] asix 3-3.2.4:1.0 eth0: link up, 100Mbps, full-duplex, lpa
> 0xC5E1
> [    5.712947] Sending DHCP requests ...... timed out!
> [   83.165303] IP-Config: Retrying forever (NFS root)...
> [   83.170397] asix 3-3.2.4:1.0 eth0: link up, 100Mbps, full-duplex, lpa
> 0xC5E1
> [   83.192944] Sending DHCP requests .....
> 
> Similar results also with dhclient. Git bisect identified the breaking
> commit as:
> 
> commit 3cc81d85ee01e5a0b7ea2f4190e2ed1165f53c31
> Author: Michel Stam <m.stam@...ro.nl>
> Date:   Thu Oct 2 10:22:02 2014 +0200
> 
>     asix: Don't reset PHY on if_up for ASIX 88772
> 
> Taking 3.18-rc3 and that commit reverted, network works again:
> 
> [    3.303500] usb 3-3.2.4: new high-speed USB device number 4 using
> exynos-ehci
> [    3.399375] usb 3-3.2.4: New USB device found, idVendor=0b95,
> idProduct=772a
> [    3.404963] usb 3-3.2.4: New USB device strings: Mfr=1, Product=2,
> SerialNumber=3
> [    3.412424] usb 3-3.2.4: Product: AX88772 
> [    3.416508] usb 3-3.2.4: Manufacturer: ASIX Elec. Corp.
> [    3.421715] usb 3-3.2.4: SerialNumber: 000001
> [    3.427755] asix 3-3.2.4:1.0 (unnamed net_device) (uninitialized):
> invalid hw address, using random
> [    3.744837] asix 3-3.2.4:1.0 eth0: register 'asix' at
> usb-12110000.usb-3.2.4, ASIX AX88772 USB 2.0 Ethernet, 12:59:f1:a8:43:90
> [    7.098998] asix 3-3.2.4:1.0 eth0: link up, 100Mbps, full-duplex, lpa
> 0xC5E1
> [    7.118258] Sending DHCP requests ., OK
> [    9.753259] IP-Config: Got DHCP answer from 192.168.1.1, my address
> is 192.168.1.111
> 
> There might something wrong on the samsung platform code (I understand
> the USB on arndale is "funny"), but this is still an regression from
> 3.17.
> 
> Riku
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