diff options
Diffstat (limited to 'drivers/cpuidle/governor.c')
| -rw-r--r-- | drivers/cpuidle/governor.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/cpuidle/governor.c b/drivers/cpuidle/governor.c index 5d359aff3cc53..9fed1b8292927 100644 --- a/drivers/cpuidle/governor.c +++ b/drivers/cpuidle/governor.c @@ -8,8 +8,10 @@ * This code is licenced under the GPL. */ -#include <linux/mutex.h> +#include <linux/cpu.h> #include <linux/cpuidle.h> +#include <linux/mutex.h> +#include <linux/pm_qos.h> #include "cpuidle.h" @@ -93,3 +95,16 @@ int cpuidle_register_governor(struct cpuidle_governor *gov) return ret; } + +/** + * cpuidle_governor_latency_req - Compute a latency constraint for CPU + * @cpu: Target CPU + */ +int cpuidle_governor_latency_req(unsigned int cpu) +{ + int global_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY); + struct device *device = get_cpu_device(cpu); + int device_req = dev_pm_qos_raw_read_value(device); + + return device_req < global_req ? device_req : global_req; +} |