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

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Date:   Thu, 14 Jan 2021 11:34:53 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Saravana Kannan <saravanak@...gle.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 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

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.

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