From: Santosh Shilimkar <santosh.shilimkar@ti.com>
Date: Sun, 25 Dec 2011 15:30:40 +0000 (+0530)
Subject: ARM: OMAP4: CPUidle: Use coupled cpuidle states to implement SMP cpuidle.
X-Git-Tag: v3.6-rc1~3^2^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dd3ad97c5621aa853843dd5e6783ca787466158c;p=pandora-kernel.git

ARM: OMAP4: CPUidle: Use coupled cpuidle states to implement SMP cpuidle.

OMAP4 CPUDILE driver is converted mainly based on notes from the
coupled cpuidle patch series.

The changes include :
- Register both CPUs and C-states to cpuidle driver.
- Set struct cpuidle_device.coupled_cpus
- Set struct cpuidle_device.safe_state to non coupled state.
- Set CPUIDLE_FLAG_COUPLED in struct cpuidle_state.flags for each
  state that affects multiple cpus.
- Separate ->enter hooks for coupled & simple idle.
- CPU0 wait loop for CPU1 power transition.
- CPU1 wakeup mechanism for the idle exit.
- Enabling ARCH_NEEDS_CPU_IDLE_COUPLED for OMAP4.

Thanks to Kevin Hilman and Colin Cross on the suggestions/fixes
on the intermediate version of this patch.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
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