bindings/cpu/idle-states.yaml

44   Idle state parameters (e.g. entry latency) are platform specific and need to
81               |       latency        |
83                                                 |  latency |
85                          |<-------  wakeup-latency ------->|
93     event conditions. The abort latency is assumed to be negligible
107   entry-latency: Worst case latency required to enter the idle state. The
108   exit-latency may be guaranteed only after entry-latency has passed.
113   wakeup-latency: Maximum delay between the signaling of a wake-up event and the
115   to be entry-latency + exit-latency.
127   wakeup-delay = exit-latency + max(entry-latency - (now - entry-timestamp), 0)
131   The wake-up delay must take into account the entry latency if that period
137   An OS has to reliably probe the wakeup-latency since some devices can enforce
138   latency constraint guarantees to work properly, so the OS has to detect the
139   worst case wake-up latency it can incur if a CPU is allowed to enter an
332       entry-latency-us:
334           Worst case latency in microseconds required to enter the idle state.
336       exit-latency-us:
338           Worst case latency in microseconds required to exit the idle state.
339           The exit-latency-us duration may be guaranteed only after
340           entry-latency-us has passed.
348       wakeup-latency-us:
354             entry-latency-us + exit-latency-us
358           systems entry-latency-us + exit-latency-us will exceed
359           wakeup-latency-us by this duration.
370       - entry-latency-us
371       - exit-latency-us
533                 entry-latency-us = <20>;
534                 exit-latency-us = <40>;
542                 entry-latency-us = <50>;
543                 exit-latency-us = <100>;
545                 wakeup-latency-us = <130>;
552                 entry-latency-us = <250>;
553                 exit-latency-us = <500>;
561                 entry-latency-us = <600>;
562                 exit-latency-us = <1100>;
564                 wakeup-latency-us = <1500>;
570                 entry-latency-us = <20>;
571                 exit-latency-us = <40>;
579                 entry-latency-us = <50>;
580                 exit-latency-us = <100>;
582                 wakeup-latency-us = <100>;
589                 entry-latency-us = <70>;
590                 exit-latency-us = <100>;
592                 wakeup-latency-us = <150>;
599                 entry-latency-us = <500>;
600                 exit-latency-us = <1200>;
602                 wakeup-latency-us = <1300>;
674                 entry-latency-us = <200>;
675                 exit-latency-us = <100>;
677                 wakeup-latency-us = <250>;
683                 entry-latency-us = <500>;
684                 exit-latency-us = <1500>;
686                 wakeup-latency-us = <1700>;
692                 entry-latency-us = <300>;
693                 exit-latency-us = <500>;
695                 wakeup-latency-us = <600>;
701                 entry-latency-us = <800>;
702                 exit-latency-us = <2000>;
704                 wakeup-latency-us = <2300>;
784                 entry-latency-us = <20>;
785                 exit-latency-us = <40>;
792                 entry-latency-us = <250>;
793                 exit-latency-us = <500>;
801                 entry-latency-us = <50>;
802                 exit-latency-us = <100>;
804                 wakeup-latency-us = <130>;
811                 entry-latency-us = <600>;
812                 exit-latency-us = <1100>;
814                 wakeup-latency-us = <1500>;
820                 entry-latency-us = <20>;
821                 exit-latency-us = <40>;
828                 entry-latency-us = <250>;
829                 exit-latency-us = <500>;
837                 entry-latency-us = <50>;
838                 exit-latency-us = <100>;
840                 wakeup-latency-us = <130>;
847                 entry-latency-us = <600>;
848                 exit-latency-us = <1100>;
850                 wakeup-latency-us = <1500>;