linux-kernel - Re: [PATCH v8 00/26] Ingenic TCU patchset v8

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Message-Id: <1548366095.3881.1@crapouillou.net>
Date:   Thu, 24 Jan 2019 18:41:35 -0300
From:   Paul Cercueil <paul@...pouillou.net>
To:     Mathieu Malaterre <malat@...ian.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Ezequiel Garcia <ezequiel@...labora.co.uk>,
        PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>,
        linux-pwm@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        linux-watchdog@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-clk@...r.kernel.org, od@...c.me
Subject: Re: [PATCH v8 00/26] Ingenic TCU patchset v8

Hi Mathieu,

Le jeu. 24 janv. 2019 à 18:26, Mathieu Malaterre <malat@...ian.org> a 
écrit :
> Paul,
> 
> On Wed, Dec 12, 2018 at 11:09 PM Paul Cercueil <paul@...pouillou.net> 
> wrote:
>> 
>>  Hi,
>> 
>>  Here's the version 8 and hopefully final version of my patchset, 
>> which
>>  adds support for the Timer/Counter Unit found in JZ47xx SoCs from
>>  Ingenic.
> 
> I can no longer boot my MIPS Creator CI20 with this series (merged
> opendingux/for-upstream-timer-v8).
> 
> Using screen+ttyUSB, I can see messages stopping at:
> 
> ...
> [  OK  ] Started Cgroup management daemon.
>          Starting Regular background program processing daemon...
> [  OK  ] Started Regular background program processing daemon.
>          Starting System Logging Service...
>          Starting Provide limited super user privileges to specific 
> users...
>          Starting Restore /etc/resolv.conf if the system cras...s 
> shut down....
>          Starting WPA supplicant...
>          Starting D-Bus System Message Bus...
> [  OK  ] Started D-Bus System Message Bus.
> 
> Nothing really stands out in the error messages. Could you suggest
> things to try out to get into a bootable state ?

I'm debugging it right now on jz4740, it seems to happen when the 
clocksource
from the ingenic-timer driver is used. Is it your case? It should not 
happen
if you have CONFIG_INGENIC_OST set.

>>  The big change is that the timer driver has been simplified. The 
>> code to
>>  dynamically update the system timer or clocksource to a new channel 
>> has
>>  been removed. Now, the system timer and clocksource are provided as
>>  children nodes in the devicetree, and the TCU channel to use for 
>> these
>>  is deduced from their respective memory resource. The PWM driver 
>> will
>>  also deduce from its memory resources whether a given PWM channel 
>> can be
>>  used, or is reserved for the system timers.
>> 
>>  Kind regards,
>>  - Paul Cercueil
>>