Re: Ethernet controller not starting

[Christian Riesch]

[cc'ed netdev and davinci-linux-open-source]

--On March 03, 2014 19:39 -0500 Jon Ringle <jon@xxxxxxxxxx> wrote:

> On Mon, Mar 3, 2014 at 6:43 PM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
> wrote:
> > On Monday, March 03, 2014 02:41:01 PM Jon Ringle wrote:
> > > I'm working on porting an ARM board from linux-3.10 to linux-3.12 (now
> > > the latest LTS kernel).
> > > I found that Ethernet controller on the board no longer comes up on
> > > linux-3.12. I was able to bisect the issue I'm having to the following
> > > commit:
> > >
> > > >   45f0a85c8258741d11bda25c0a5669c06267204a is the first bad commit
> > > >   commit 45f0a85c8258741d11bda25c0a5669c06267204a
> > > >   Author: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> > > >   Date:   Mon Jun 3 21:49:52 2013 +0200
> > > >
> > > >       PM / Runtime: Rework the "runtime idle" helper routine
> > > >
> > > >       The "runtime idle" helper routine, rpm_idle(), currently ignores
> > > >       return values from .runtime_idle() callbacks executed by it.
> > > >       However, it turns out that many subsystems use
> > > >       pm_generic_runtime_idle() which checks the return value of the
> > > >       driver's callback and executes pm_runtime_suspend() for the
> > > >       device unless that value is not 0.  If that logic is moved to
> > > >       rpm_idle() instead, pm_generic_runtime_idle() can be dropped
> > > >       and its users will not need any .runtime_idle() callbacks any
> > > >       more.
> > > >
> > > >       Moreover, the PCI, SCSI, and SATA subsystems' .runtime_idle()
> > > >       routines, pci_pm_runtime_idle(), scsi_runtime_idle(), and
> > > >       ata_port_runtime_idle(), respectively, as well as a few drivers'
> > > >       ones may be simplified if rpm_idle() calls rpm_suspend() after
> > > >       0 has been returned by the .runtime_idle() callback executed by
> > > >       it.
> > > >
> > > >       To reduce overall code bloat, make the changes described above.
> > > >
> > > >       Tested-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> > > >       Tested-by: Kevin Hilman <khilman@xxxxxxxxxx>
> > > >       Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> > > >       Acked-by: Kevin Hilman <khilman@xxxxxxxxxx>
> > > >       Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> > > >       Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> > >
> > > Can anyone offer any suggestions on what I should be looking for to
> > > fix this on my board?
> >
> > Any pointers to the driver in question?
>
> drivers/net/ethernet/ti/davinci_emac.c

Hi Jon,
I have successfully used the davinci_emac driver on a custom board with an 
AM1808 SoC with Kernel 3.13 a few weeks ago. So at least 3.13 should work. 
Did you try more recent kernel versions than 3.12?

> I also get the following output:
>
>          Starting Network Manager Wait Online...
> [   30.946509] davinci_mdio davinci_mdio.0: resetting idled controller
> [   30.953220] net net0: attached PHY driver [Generic PHY]
> (mii_bus:phy_addr=davinci_mdio-0:00, id=7c0f1)
> [   30.962938] IPv6: ADDRCONF(NETDEV_UP): net0: link is not ready
> [   31.082087] genirq: Flags mismatch irq 33. 00000000 (net0) vs.
> 00000000 (net0)

Is it correct that this warning can only appear in case of shared 
interrupts? See kernel/irq/manage.c. Since we don't use shared interrupts 
here: Are you sure your board configuration is correct with regard to emac 
interrupts? Is your configuration using device tree or not (my 
configuration is a none-devicetree one)? I also wonder why your network 
device is net0, on my board it's eth0, maybe this triggers some bug?

Christian



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