netdev - Re: PROBLEM: Broken or delayed ethernet on Xilinx ZCU104 since 5.18 (regression)

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Date: Fri, 4 Aug 2023 11:02:43 -0600
From: Rob Herring <robh@...nel.org>
To: Nick Bowler <nbowler@...conx.ca>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	netdev@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: PROBLEM: Broken or delayed ethernet on Xilinx ZCU104 since 5.18 (regression)

On Fri, Aug 4, 2023 at 10:54 AM Nick Bowler <nbowler@...conx.ca> wrote:
>
> On 2023-08-04, Nick Bowler <nbowler@...conx.ca> wrote:
> > On 04/08/2023, Rob Herring <robh@...nel.org> wrote:
> >> On Fri, Aug 4, 2023 at 9:27 AM Nick Bowler <nbowler@...conx.ca> wrote:
> >>>   commit e461bd6f43f4e568f7436a8b6bc21c4ce6914c36
> >>>   Author: Robert Hancock <robert.hancock@...ian.com>
> >>>   Date:   Thu Jan 27 10:37:36 2022 -0600
> >>>
> >>>       arm64: dts: zynqmp: Added GEM reset definitions
> >>>
> >>> Reverting this fixes the problem on 5.18.  Reverting this fixes the
> >>> problem on 6.1.  Reverting this fixes the problem on 6.4.  In all of
> >>> these versions, with this change reverted, the network device appears
> >>> without delay.
> >>
> >> With the above change, the kernel is going to be waiting for the reset
> >> driver which either didn't exist or wasn't enabled in your config
> >> (maybe kconfig needs to be tweaked to enable it automatically).
> >
> > The dts defines a reset-controller node with
> >
> >   compatible = "xlnx,zynqmp-reset"
> >
> > As far as I can see, this is supposed to be handled by the code in
> > drivers/reset/zynqmp-reset.c driver, it is enabled by CONFIG_ARCH_ZYNQMP,
> > and I have that set to "y", and it appears to be getting compiled in (that
> > is, there is a drivers/reset/zynqmp-reset.o file in the build directory).
>
> Oh, I get it, to include this driver I need to also enable:
>
>   CONFIG_RESET_CONTROLLER=y
>
> Setting this fixes 6.4.  Perhaps CONFIG_ARCH_ZYNQMP should select it?

Maybe. Do other platforms do that?

> I guess the reset-zynqmp.o file that was in my build directory must
> have been leftover garbage from a long time ago.
>
> However, even with this option enabled, 6.5-rc4 remains broken (no
> change in behaviour wrt. the network device).  I will bisect this
> now.

It would be good to know why the deferred probe timeout doesn't work.
If you disable modules, the kernel shouldn't wait past late_initcall.
Though this functionality keeps getting tweaked, so I may be off on
the current behavior.

Rob