linux-kernel - Re: [RFC 08/17] ARM: mvebu: remove custom .init_time hook

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Message-ID: <52177047.9070706@free-electrons.com>
Date:	Fri, 23 Aug 2013 16:23:03 +0200
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
CC:	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: [RFC 08/17] ARM: mvebu: remove custom .init_time hook

On 23/08/2013 14:13, Sebastian Hesselbarth wrote:
> On 08/23/13 13:39, Gregory CLEMENT wrote:
>> On 23/08/2013 12:32, Sebastian Hesselbarth wrote:
>>> On 08/23/13 12:06, Gregory CLEMENT wrote:
>>>> On 20/08/2013 04:04, Sebastian Hesselbarth wrote:
>>>>> With arch/arm calling of_clk_init(NULL) from time_init(), we can now
>>>>> remove custom .init_time hooks.
>>>>
>>>> As a feared it won't work on Armada XP. You moved coherency_init(), and
>>>> l2x0_of_init() in the init_machine hook. However init_machine is an
>>>> arch_initcall, and as all the initcall it is called at the end of the
>>>> do_basic_setup() which is called after smp_prepare_cpus(). The issue is
>>>> that smp_prepare_cpus need coherency (and I think L2 cache) already enable.
>>>
>>> Ok, I see. I remember mvebu smp relies on mbus mappings also? Can you
>>> try below as replacement for the mach-mvebu/armada-370-xp.c changes?
>>>
>>> It will move coherency_init(), l2x0_of_init(), and mvebu_mbus_dt_init()
>>> to .init_early hook.
>>>
>>
>> I can't test it, because I don't receive the patch 1 and 2 neither directly
>> or through linux-arm-kernel (it should have been bounced), or even at
>> https://github.com/shesselba/linux-dove.git
>>
>> If you don't want to send them again, could you at least push our branch on your
>> github?
> 
> Gregory,
> 
> I pushed a branch containing the latest state to
> https://github.com/shesselba/linux-dove.git arm-clk-of-init
> 
> It still contains the changes to drivers/clk.c, that will become
> obsolete, if there are no objections against Stephen's tegra patch.
> 

I tested your branch on my Armada XP boards (the GP and the AX3), and it hanged
very early: before that anything was displayed by the early_printk!

init_early is maybe called too early :(

> Sebastian
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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