linux-kernel - Re: [PATCH v1 0/5] Enable fw

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Date:   Thu, 14 Jan 2021 08:40:35 -0800
From:   Saravana Kannan <saravanak@...gle.com>
To:     Jon Hunter <jonathanh@...dia.com>
Cc:     Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Jisheng Zhang <Jisheng.Zhang@...aptics.com>,
        Kevin Hilman <khilman@...libre.com>,
        John Stultz <john.stultz@...aro.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v1 0/5] Enable fw_devlink=on by default

On Thu, Jan 14, 2021 at 3:35 AM Jon Hunter <jonathanh@...dia.com> wrote:
>
>
> On 13/01/2021 21:29, Saravana Kannan wrote:
>
> ...
>
> >> I am seeing the same problem on Tegra30 Cardhu A04 where several regulators
> >> are continuously deferred and prevents the board from booting ...
> >>
> >> [    2.518334] platform panel: probe deferral - supplier regulator@11 not ready
> >>
> >> [    2.525503] platform regulator@1: probe deferral - supplier 4-002d not ready
> >>
> >> [    2.533141] platform regulator@3: probe deferral - supplier regulator@101 not ready
> >>
> >> [    2.540856] platform regulator@5: probe deferral - supplier regulator@101 not ready
> >>
> >> [    2.548589] platform regulator@6: probe deferral - supplier regulator@101 not ready
> >>
> >> [    2.556316] platform regulator@7: probe deferral - supplier regulator@101 not ready
> >>
> >> [    2.564041] platform regulator@8: probe deferral - supplier regulator@101 not ready
> >>
> >> [    2.571743] platform regulator@9: probe deferral - supplier regulator@101 not ready
> >>
> >> [    2.579463] platform regulator@10: probe deferral - supplier regulator@101 not ready
> >>
> >> [    2.587273] platform regulator@11: probe deferral - supplier regulator@101 not ready
> >>
> >> [    2.595088] platform regulator@12: probe deferral - supplier regulator@104 not ready
> >>
> >> [    2.603837] platform regulator@102: probe deferral - supplier regulator@104 not ready
> >>
> >> [    2.611726] platform regulator@103: probe deferral - supplier regulator@104 not ready
> >>
> >> [    2.620137] platform 3000.pcie: probe deferral - supplier regulator@5 not ready
> >
> > Looks like this is not the whole log? Do you see any "wait for
> > supplier" logs? That's what all these boot issues should boil down to.
> > And as usual, pointer to DT for this board please.
>
> Ah yes I see ...
>
>  platform regulator@1: probe deferral - wait for supplier tps65911@2d

Do you mind sharing the full log please? It's hard to tell you
anything useful with bits and pieces of logs.

> Yes the device-tree for this board can be found here [0]. Looks like
> there is a circular dependency between the vddctrl_reg and vddcore_reg.
> This is part of coupled regulators which have a two-way linkage [1]. So
> this change appears to conflict with this.

fw_devlink doesn't track "regulator-coupled-with". So that's probably
not it. Also, this patch series was made to handle simple cycles
properly. It'll functionally disable the device links it created when
it comes to probe ordering. Only two overlapping cycles might cause
issues -- and even that, not all the time. So yeah, full log please.

-Saravana

> Jon
>
> [0]
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/tegra30-cardhu-a04.dts
> [1]
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/regulator/regulator.yaml#n129
>
> --
> nvpublic