On Mon, Nov 29, 2010 at 3:19 PM, Vincent Guittot
<vincent.guittot@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
I remember getting it Acked by most of the platform maintainers, but Russell had some
reservations on that.
Cheers!