diff options
Diffstat (limited to 'kernel/drivers/cpuidle/cpuidle-powernv.c')
| -rw-r--r-- | kernel/drivers/cpuidle/cpuidle-powernv.c | 12 |
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; |