[PATCH][ ARM cpu hotplug 2/2 ] Use common cpu hotplug code for UX500

Sundar sunder.svit at gmail.com
Mon Nov 29 14:01:00 UTC 2010


Hi Vincent,

> On Mon, Nov 29, 2010 at 3:19 PM, Vincent Guittot <vincent.guittot at linaro.org> wrote:
>>
>> This patch extracts the common code of the cpu hotplug feature across
>> arm platforms. The goal is to only keep the specific stuff of the
>> platform in the sub-architecture. I have created a hotplug.c file in
>> the  arm/common directory after studying the cpu hotplug code of
>> omap2, realview, s5pv310, ux500 and tegra. I have extracted 3 main
>> platform dependent functions:
>>  -platform_enter_lowpower which prepares the platform for low power.
>>  -platform_do_lowpower on which the cpu will loop until it becomes
>> really plugged (spurious wake up). This function must returned the cpu
>> Id in order to leave the unplug state.
>>  -platform_leave_lowpower which restore the platform context.
>>  An ux500 patch is available which uses the common/hotplug.c code.
>> This patch is quite short because the idle / power down functions are
>> not yet upstreamed
>>
>

I had posted a patch which does exactly the same thing sometime ago,
but it got dropped
off from the radar. The patch set can be referenced
@ http://www.spinics.net/lists/arm-kernel/msg97600.html
I remember getting it Acked by most of the platform maintainers, but
Russell had some
reservations on that.

Cheers!

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