power: fix typo in PM QoS doc

The typo in the guide is hard to understand. Necessary to fix it.

Fixes: dd6fd75bf662 ("power: introduce PM QoS API on CPU wide")

Signed-off-by: Huisong Li <lihuisong

power: fix typo in PM QoS doc

The typo in the guide is hard to understand. Necessary to fix it.

Fixes: dd6fd75bf662 ("power: introduce PM QoS API on CPU wide")

Signed-off-by: Huisong Li <lihuisong@huawei.com>

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power: introduce PM QoS API on CPU wide

The deeper the idle state, the lower the power consumption, but the longer
the resume time. Some service are delay sensitive and very except the low
resume ti

power: introduce PM QoS API on CPU wide

The deeper the idle state, the lower the power consumption, but the longer
the resume time. Some service are delay sensitive and very except the low
resume time, like interrupt packet receiving mode.

And the "/sys/devices/system/cpu/cpuX/power/pm_qos_resume_latency_us" sysfs
interface is used to set and get the resume latency limit on the cpuX for
userspace. Each cpuidle governor in Linux select which idle state to enter
based on this CPU resume latency in their idle task.

The per-CPU PM QoS API can be used to control this CPU's idle state
selection and limit just enter the shallowest idle state to low the delay
when wake up from by setting strict resume latency (zero value).

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Chengwen Feng <fengchengwen@huawei.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@huawei.com>
Acked-by: Sivaprasad Tummala <sivaprasad.tummala@amd.com>

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