summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/cpuidle/cpuidle-powernv.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/drivers/cpuidle/cpuidle-powernv.c')
-rw-r--r--kernel/drivers/cpuidle/cpuidle-powernv.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/drivers/cpuidle/cpuidle-powernv.c b/kernel/drivers/cpuidle/cpuidle-powernv.c
index 3442764a5..845bafcfa 100644
--- a/kernel/drivers/cpuidle/cpuidle-powernv.c
+++ b/kernel/drivers/cpuidle/cpuidle-powernv.c
@@ -29,18 +29,25 @@ struct cpuidle_driver powernv_idle_driver = {
static int max_idle_state;
static struct cpuidle_state *cpuidle_state_table;
+static u64 snooze_timeout;
+static bool snooze_timeout_en;
static int snooze_loop(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
+ u64 snooze_exit_time;
+
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
+ snooze_exit_time = get_tb() + snooze_timeout;
ppc64_runlatch_off();
while (!need_resched()) {
HMT_low();
HMT_very_low();
+ if (snooze_timeout_en && get_tb() > snooze_exit_time)
+ break;
}
HMT_medium();
@@ -261,6 +268,11 @@ 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) {
+ snooze_timeout_en = true;
+ snooze_timeout = powernv_states[1].target_residency *
+ tb_ticks_per_usec;
+ }
} else
return -ENODEV;