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path: root/drivers/cpuidle
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-rw-r--r--drivers/cpuidle/cpuidle-powernv.c32
1 files changed, 26 insertions, 6 deletions
diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
index 1a8234e706bc..d29e4f041efe 100644
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -43,9 +43,31 @@ struct stop_psscr_table {
static struct stop_psscr_table stop_psscr_table[CPUIDLE_STATE_MAX] __read_mostly;
-static u64 snooze_timeout __read_mostly;
+static u64 default_snooze_timeout __read_mostly;
static bool snooze_timeout_en __read_mostly;
+static u64 get_snooze_timeout(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv,
+ int index)
+{
+ int i;
+
+ if (unlikely(!snooze_timeout_en))
+ return default_snooze_timeout;
+
+ for (i = index + 1; i < drv->state_count; i++) {
+ struct cpuidle_state *s = &drv->states[i];
+ struct cpuidle_state_usage *su = &dev->states_usage[i];
+
+ if (s->disabled || su->disable)
+ continue;
+
+ return s->target_residency * tb_ticks_per_usec;
+ }
+
+ return default_snooze_timeout;
+}
+
static int snooze_loop(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
@@ -56,7 +78,7 @@ static int snooze_loop(struct cpuidle_device *dev,
local_irq_enable();
- snooze_exit_time = get_tb() + snooze_timeout;
+ snooze_exit_time = get_tb() + get_snooze_timeout(dev, drv, index);
ppc64_runlatch_off();
HMT_very_low();
while (!need_resched()) {
@@ -465,11 +487,9 @@ static int powernv_idle_probe(void)
cpuidle_state_table = powernv_states;
/* Device tree can indicate more idle states */
max_idle_state = powernv_add_idle_states();
- if (max_idle_state > 1) {
+ default_snooze_timeout = TICK_USEC * tb_ticks_per_usec;
+ if (max_idle_state > 1)
snooze_timeout_en = true;
- snooze_timeout = powernv_states[1].target_residency *
- tb_ticks_per_usec;
- }
} else
return -ENODEV;