OMAP4: cpuidle: don't touch mpu and core state until CPU1 is off

OMAP4: cpuidle: don't touch mpu and core state until CPU1 is off

MPU/Core logic and PD states shouldn't be changed until CPU1 is
completely off

Change-Id: Ia90126776e7bd7108c7b885c622df36323982cb0
Signed-off-by: Lianwei Wang <lian-wei.wang@motorola.com>
Signed-off-by: suilunlam <a0868997@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
sched: Prevent wakeup to enter critical section needlessly

Check the waitqueue task list to be non empty before entering the critical
section. This prevents locking the spin lock needlessly in case the queue
was empty, and therefor also prevent scheduling overhead on a PREEMPT_RT
system.

Signed-off-by: Ivo Sieben <meltedpianoman@gmail.com>
backported from Linux 3.5+ by faux123
timers: Avoid finding cpu for migration of running timers in __mod_timer()

Currently we don't support migration of currently running timers. Current code
flow in __mod_timer() is:
- Find a cpu where we should migrate the timer
- Check if timer is currently running
- If yes, don't migrate.

In this process, the first step is a unnecessary activiy, if the timer is
currently running. This patch tries to avoid it in such cases.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
backported from Linux 3.5+ by faux123
cpufreq: add ondemand two-phase scheduling

two phase scheduling will provide further power savings to ondemand
scheduler

Signed-off-by: Willi Ye <williye97@gmail.com>

Conflicts:
	arch/arm/mach-omap2/board-tuna.c
	drivers/cpufreq/cpufreq_ondemand.c
omap2: board-tuna.c: add missing #endif

Signed-off-by: Willi Ye <williye97@gmail.com>
config dump

Signed-off-by: Willi Ye <williye97@gmail.com>
board/tuna: initialize mem_sleep states to remove warnings in dmesg logs
Add toro plus identification into board
board-tuna: misc minor tweaks
omap2plus: cpufreq: Modify lpj recalculation logic

omap2plus: cpufreq: Modify lpj recalculation logic

Somethimes "mdelay" function provide delay
that several times shorter than it should be.

This happens because recalculating lpj
performed after switching OPP. In this case,
for short period of time, when OPP on MPU
was switched but lpj was not recalculated,
"udelay" function can provide incorrect
delay - upto 5 times shorter
(if OPP was switched from lowest to highest).

This patch changes lpj recalculation logic to:
if OPP will be switched to higher - recalculate lpj before switching OPP,
if OPP will be switched to lower - recalculate lpj after switching OPP.

Change-Id: I3258e756c471fd0258a849d712ab00f4e1279ea9
Signed-off-by: Sergii Postulga <x0153364@ti.com>