From 98be0dde1957a1e47d42cf2c220bf52bacf81d6e Mon Sep 17 00:00:00 2001 From: Santosh Shilimkar Date: Sun, 16 Jan 2011 00:42:31 +0530 Subject: [PATCH] ARM: OMAP4: cpuidle: Switch to gptimer from twd in deeper C-states. CPU local timer(TWD) stops when the CPU is transitioning into deeper C-States. Since these timers are not wakeup capable, we need the wakeup capable global timer to program the wakeup time depending on the next timer expiry. It can be handled by registering a global wakeup capable timer along with local timers marked with (mis)feature flag CLOCK_EVT_FEAT_C3STOP. Then notify the clock events layer from idle code using CLOCK_EVT_NOTIFY_BROADCAST_ENTER/EXIT). ARM local timers are already marked with C3STOP feature. Add the notifiers to OMAP4 CPU idle code for the broadcast entry and exit. Signed-off-by: Santosh Shilimkar Acked-by: Jean Pihet Acked-by: Kevin Hilman Tested-by: Vishwanath BS Signed-off-by: Kevin Hilman --- arch/arm/mach-omap2/cpuidle44xx.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm/mach-omap2/cpuidle44xx.c b/arch/arm/mach-omap2/cpuidle44xx.c index 81386c6..cfdbb86 100644 --- a/arch/arm/mach-omap2/cpuidle44xx.c +++ b/arch/arm/mach-omap2/cpuidle44xx.c @@ -14,6 +14,7 @@ #include #include #include +#include #include @@ -65,6 +66,7 @@ static int omap4_enter_idle(struct cpuidle_device *dev, u32 cpu1_state; int idle_time; int new_state_idx; + int cpu_id = smp_processor_id(); /* Used to keep track of the total time in idle */ getnstimeofday(&ts_preidle); @@ -86,6 +88,9 @@ static int omap4_enter_idle(struct cpuidle_device *dev, cx = cpuidle_get_statedata(&dev->states_usage[new_state_idx]); } + if (index > 0) + clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &cpu_id); + /* * Call idle CPU PM enter notifier chain so that * VFP and per CPU interrupt context is saved. @@ -121,6 +126,9 @@ static int omap4_enter_idle(struct cpuidle_device *dev, if (omap4_mpuss_read_prev_context_state()) cpu_cluster_pm_exit(); + if (index > 0) + clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &cpu_id); + getnstimeofday(&ts_postidle); ts_idle = timespec_sub(ts_postidle, ts_preidle); -- 2.7.4