[PATCH][ ARM cpu hotplug 2/2 ] Use common cpu hotplug code for UX500
amit.kucheria at linaro.org
Tue Nov 30 05:04:53 UTC 2010
On Mon, Nov 29, 2010 at 7:31 PM, Sundar <sunder.svit at gmail.com> wrote:
> 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.
It is unfortunate that we didn't catch that work when we started on this.
Let us continue discussion on the other sub-thread of the current posting.
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