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

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Date:   Thu, 14 Jan 2021 16:47:56 +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 14/01/2021 16:40, Saravana Kannan wrote:
> 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.


No problem. Please find attached.

Cheers
Jon


-- 
nvpublic

View attachment "tegra30-cardhu-a04-bootlog.txt" of type "text/plain" (104094 bytes)