Rpi3: no ethernet in 4.13: bisected to patch 'USB: of: fix root-hub device-tree node handling'

[Johan Hovold]

On Wed, Aug 02, 2017 at 09:03:43AM +0200, Hans Verkuil wrote:
> When testing with my Raspberry Pi 3 and the 4.13-rcX mainline kernel
> I discovered that there was no ethernet. After bisecting I got to commit
> 2bf69867 ('USB: of: fix root-hub device-tree node handling').
> 
> With that commit lsusb outputs:
> 
> rpi3: ~ # lsusb
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> 
> After reverting just that commit (I'm on 4.13-rc3 now) ethernet is
> restored and lsusb gives me:
> 
> rpi3: ~ $ lsusb
> Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
> Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> 
> I don't speak USB, so I have no idea why this patch causes these issues,
> but I am happy to test patches.

Thanks for reporting this. At first glance, I fail to see how setting
the device-node pointer for the root hub slightly sooner would cause the
SMC9514 hub not to enumerate, but I'll try and see if I can reproduce
this here.

I guess there are no further hints in the boot logs?

Thanks,
Johan