[PATCH] cpuidle/powernv: Enter fastsleep on checking if deep idle states are allowed

[Preeti U Murthy]

Today the procfs interface /proc/sys/kernel/powersave-nap is used to control
entry into deep idle states beyond snooze. Check for the value of this
parameter before entering fastsleep. We already do this check for nap in
power7_idle().

Signed-off-by: Preeti U Murthy <preeti@xxxxxxxxxxxxxxxxxx>
---

 drivers/cpuidle/cpuidle-powernv.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
index a64be57..b8ba52e 100644
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -69,6 +69,12 @@ static int fastsleep_loop(struct cpuidle_device *dev,
 	unsigned long old_lpcr = mfspr(SPRN_LPCR);
 	unsigned long new_lpcr;
 
+	/*
+	 * Verify if snooze is the only valid cpuidle state
+	 */
+	if (!(powersave_nap > 0))
+		return index;
+
 	if (unlikely(system_state < SYSTEM_RUNNING))
 		return index;
 

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