diff options
Diffstat (limited to 'drivers/cpuidle/cpuidle-powernv.c')
| -rw-r--r-- | drivers/cpuidle/cpuidle-powernv.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c index 78fd174c57e8..4fb97cef82fd 100644 --- a/drivers/cpuidle/cpuidle-powernv.c +++ b/drivers/cpuidle/cpuidle-powernv.c @@ -11,6 +11,7 @@ #include <linux/cpuidle.h> #include <linux/cpu.h> #include <linux/notifier.h> +#include <linux/clockchips.h> #include <asm/machdep.h> #include <asm/firmware.h> @@ -49,6 +50,32 @@ static int nap_loop(struct cpuidle_device *dev, return index; } +static int fastsleep_loop(struct cpuidle_device *dev, + struct cpuidle_driver *drv, + int index) +{ + unsigned long old_lpcr = mfspr(SPRN_LPCR); + unsigned long new_lpcr; + + if (unlikely(system_state < SYSTEM_RUNNING)) + return index; + + new_lpcr = old_lpcr; + new_lpcr &= ~(LPCR_MER | LPCR_PECE); /* lpcr[mer] must be 0 */ + + /* exit powersave upon external interrupt, but not decrementer + * interrupt. + */ + new_lpcr |= LPCR_PECE0; + + mtspr(SPRN_LPCR, new_lpcr); + power7_sleep(); + + mtspr(SPRN_LPCR, old_lpcr); + + return index; +} + /* * States for dedicated partition case. */ @@ -67,6 +94,13 @@ static struct cpuidle_state powernv_states[] = { .exit_latency = 10, .target_residency = 100, .enter = &nap_loop }, + { /* Fastsleep */ + .name = "fastsleep", + .desc = "fastsleep", + .flags = CPUIDLE_FLAG_TIME_VALID, + .exit_latency = 10, + .target_residency = 100, + .enter = &fastsleep_loop }, }; static int powernv_cpuidle_add_cpu_notifier(struct notifier_block *n, |