On Mon, Nov 29, 2010 at 7:31 PM, Sundar <sunder.s...@gmail.com> wrote:
> Hi Vincent, > > > On Mon, Nov 29, 2010 at 3:19 PM, Vincent Guittot < > vincent.guit...@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. /Amit
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