1933f9648d
After change, when CONFIG_PM_NDOMAINS > 1, the pm_register will not able to get notificaion from not PM_IDLE_DOMAIN. Should use pm_domain_register as a replacement. Isolate domains from global callbacks can decrease not necessary execution, and reduce the lock instruction requirements. Signed-off-by: buxiasen <buxiasen@xiaomi.com>
604 lines
17 KiB
C
604 lines
17 KiB
C
/****************************************************************************
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* drivers/power/pm/activity_governor.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <assert.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <nuttx/power/pm.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/irq.h>
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#include "pm.h"
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#ifdef CONFIG_PM_GOVERNOR_ACTIVITY
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define PM_TIMER_GAP (TIME_SLICE_TICKS * 2)
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/* Convert the time slice interval into system clock ticks.
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*
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* CONFIG_PM_SLICEMS provides the duration of one time slice in milliseconds.
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* CLOCKS_PER_SEC provides the number of timer ticks in one second.
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*
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* slice ticks = (CONFIG_PM_SLICEMS msec / 1000 msec/sec) /
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* (CLOCKS_PER_SEC ticks/sec)
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*/
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#define TIME_SLICE_TICKS ((CONFIG_PM_GOVERNOR_SLICEMS * CLOCKS_PER_SEC) / 1000)
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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struct pm_domain_state_s
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{
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/* recommended - The recommended state based on the governor policy
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* mndex - The index to the next slot in the memory[] array to use.
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* mcnt - A tiny counter used only at start up. The actual algorithm
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* cannot be applied until CONFIG_PM_GOVERNOR_MEMORY
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* samples have been collected.
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*/
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uint8_t recommended;
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uint8_t mndx;
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uint8_t mcnt;
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/* accum - The accumulated counts in this time interval */
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int16_t accum;
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#if CONFIG_PM_GOVERNOR_MEMORY > 1
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/* This is the averaging "memory." The averaging algorithm is simply:
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* Y = (An*X + SUM(Ai*Yi))/SUM(Aj), where i = 1..n-1 and j= 1..n, n is the
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* length of the "memory", Ai is the weight applied to each value, and X is
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* the current activity.
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*
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* CONFIG_PM_GOVERNOR_MEMORY provides the memory for the algorithm.
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* Default: 2
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* CONFIG_PM_COEFn provides weight for each sample. Default: 1
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*/
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int16_t memory[CONFIG_PM_GOVERNOR_MEMORY - 1];
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#endif
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/* stime - The time (in ticks) at the start of the current time slice */
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clock_t stime;
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/* btime - The time (in ticks) at the start of the current state */
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clock_t btime;
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/* Timer to decrease state */
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struct wdog_s wdog;
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};
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struct pm_activity_governor_s
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{
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/* Threshold time slice count to enter the next low power consdumption
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* state. Indexing is next state 0:IDLE, 1: STANDBY, 2: SLEEP.
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*/
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const uint32_t pmcount[3];
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/* Threshold activity values to enter into the next lower power consumption
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* state. Indexing is next state 0:IDLE, 1:STANDBY, 2:SLEEP.
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*/
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const int32_t pmenterthresh[3];
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/* Threshold activity values to leave the current low power consdumption
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* state. Indexing is current state 0:IDLE, 1: STANDBY, 2: SLEEP.
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*/
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const int32_t pmexitthresh[3];
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/* CONFIG_PM_GOVERNOR_MEMORY is the total number of time slices (including
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* the current time slice). The history of previous values is then
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* CONFIG_PM_GOVERNOR_MEMORY-1.
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*/
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#if CONFIG_PM_GOVERNOR_MEMORY > 1
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const int16_t pmcoeffs[CONFIG_PM_GOVERNOR_MEMORY - 1];
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#endif
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struct pm_domain_state_s domain_states[CONFIG_PM_NDOMAINS];
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static void governor_initialize(void);
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static void governor_statechanged(int domain, enum pm_state_e newstate);
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static enum pm_state_e governor_checkstate(int domain);
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static void governor_activity(int domain, int count);
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static void governor_timer(int domain, enum pm_state_e newstate);
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static void governor_update(int domain, int16_t accum);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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struct pm_activity_governor_s g_pm_activity_governor =
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{
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{
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CONFIG_PM_GOVERNOR_IDLEENTER_COUNT,
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CONFIG_PM_GOVERNOR_STANDBYENTER_COUNT,
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CONFIG_PM_GOVERNOR_SLEEPENTER_COUNT
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},
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{
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CONFIG_PM_GOVERNOR_IDLEENTER_THRESH,
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CONFIG_PM_GOVERNOR_STANDBYENTER_THRESH,
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CONFIG_PM_GOVERNOR_SLEEPENTER_THRESH
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},
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{
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CONFIG_PM_GOVERNOR_IDLEEXIT_THRESH,
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CONFIG_PM_GOVERNOR_STANDBYEXIT_THRESH,
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CONFIG_PM_GOVERNOR_SLEEPEXIT_THRESH
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},
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#if CONFIG_PM_GOVERNOR_MEMORY > 1
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{
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CONFIG_PM_GOVERNOR_COEF1
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#if CONFIG_PM_GOVERNOR_MEMORY > 2
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, CONFIG_PM_GOVERNOR_COEF2
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#endif
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#if CONFIG_PM_GOVERNOR_MEMORY > 3
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, CONFIG_PM_GOVERNOR_COEF3
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#endif
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#if CONFIG_PM_GOVERNOR_MEMORY > 4
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, CONFIG_PM_GOVERNOR_COEF4
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#endif
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#if CONFIG_PM_GOVERNOR_MEMORY > 5
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, CONFIG_PM_GOVERNOR_COEF5
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#endif
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#if CONFIG_PM_GOVERNOR_MEMORY > 6
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# warning "This logic needs to be extended"
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#endif
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}
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#endif
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};
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static const struct pm_governor_s g_pmgovernor =
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{
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governor_initialize, /* initialize */
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NULL, /* deinitialize */
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governor_statechanged, /* statechanged */
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governor_checkstate, /* checkstate */
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governor_activity, /* activity */
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NULL /* priv */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static void governor_initialize(void)
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{
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FAR struct pm_domain_state_s *pdomstate;
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int i;
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for (i = 0; i < CONFIG_PM_NDOMAINS; i++)
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{
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pdomstate = &g_pm_activity_governor.domain_states[i];
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pdomstate->stime = clock_systime_ticks();
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pdomstate->btime = clock_systime_ticks();
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}
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}
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static void governor_activity(int domain, int count)
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{
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FAR struct pm_domain_state_s *pdomstate;
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clock_t now, elapsed;
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uint32_t accum;
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irqstate_t flags;
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/* Get a convenience pointer to minimize all of the indexing */
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DEBUGASSERT(domain >= 0 && domain < CONFIG_PM_NDOMAINS);
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pdomstate = &g_pm_activity_governor.domain_states[domain];
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/* Just increment the activity count in the current time slice. The
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* priority is simply the number of counts that are added.
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*/
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if (count > 0)
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{
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/* Add the activity count to the accumulated counts. */
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flags = pm_domain_lock(domain);
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accum = (uint32_t)pdomstate->accum + count;
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/* Make sure that we do not overflow the underlying representation */
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if (accum > INT16_MAX)
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{
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accum = INT16_MAX;
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}
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/* Save the updated count */
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pdomstate->accum = (int16_t)accum;
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/* Check the elapsed time. In periods of low activity, time slicing is
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* controlled by IDLE loop polling; in periods of higher activity, time
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* slicing is controlled by driver activity. In either case, the
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* duration of the time slice is only approximate; during times of
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* heavy activity, time slices may be become longer and the activity
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* level may be over-estimated.
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*/
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now = clock_systime_ticks();
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elapsed = now - pdomstate->stime;
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if (elapsed >= TIME_SLICE_TICKS)
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{
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int16_t tmp;
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/* Sample the count, reset the time and count, and assess the PM
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* state. This is an atomic operation because interrupts are
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* still disabled.
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*/
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tmp = pdomstate->accum;
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pdomstate->stime = now;
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pdomstate->accum = 0;
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governor_update(domain, tmp);
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}
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pm_domain_unlock(domain, flags);
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}
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}
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/****************************************************************************
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* Name: governor_update
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*
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* Description:
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* This internal function is called at the end of a time slice in order to
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* update driver activity metrics and recommended states.
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*
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* Input Parameters:
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* domain - The PM domain associated with the accumulator
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* accum - The value of the activity accumulator at the end of the time
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* slice.
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*
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* Returned Value:
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* None.
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*
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* Assumptions:
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* This function may be called from a driver, perhaps even at the interrupt
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* level. It may also be called from the IDLE loop at the lowest possible
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* priority level.
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*
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****************************************************************************/
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static void governor_update(int domain, int16_t accum)
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{
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FAR struct pm_domain_state_s *pdomstate;
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uint8_t state;
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int32_t y;
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int index;
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#if CONFIG_PM_GOVERNOR_MEMORY > 1
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int32_t denom;
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int i = 0;
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int j;
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#endif
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/* Get a convenience pointer to minimize all of the indexing */
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DEBUGASSERT(domain >= 0 && domain < CONFIG_PM_NDOMAINS);
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pdomstate = &g_pm_activity_governor.domain_states[domain];
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state = g_pmdomains[domain].state;
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#if CONFIG_PM_GOVERNOR_MEMORY > 1
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/* We won't bother to do anything until we have accumulated
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* CONFIG_PM_GOVERNOR_MEMORY-1 samples.
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*/
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if (pdomstate->mcnt < CONFIG_PM_GOVERNOR_MEMORY - 1)
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{
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index = pdomstate->mcnt++;
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pdomstate->memory[index] = accum;
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return;
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}
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/* The averaging algorithm is simply: Y = (An*X + SUM(Ai*Yi))/SUM(Aj),
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* where i = 1..n-1 and j= 1..n, n is the length of the "memory", Ai is
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* the weight applied to each value, and X is the current activity.
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*
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* CONFIG_PM_GOVERNOR_MEMORY:
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* provides the memory for the algorithm. Default: 2
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* CONFIG_PM_GOVERNOR_COEFn:
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* provides weight for each sample. Default: 1
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*
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* First, calculate Y = An*X
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*/
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y = CONFIG_PM_GOVERNOR_COEFN * accum;
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denom = CONFIG_PM_GOVERNOR_COEFN;
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/* Then calculate Y += SUM(Ai*Yi), i = 1..n-1. The oldest sample will
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* reside at the domain's mndx (and this is the value that we will
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* overwrite with the new value).
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*/
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for (j = pdomstate->mndx; i < CONFIG_PM_GOVERNOR_MEMORY - 1; i++, j++)
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{
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if (j >= CONFIG_PM_GOVERNOR_MEMORY - 1)
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{
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j = 0;
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}
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y += g_pm_activity_governor.pmcoeffs[i] * pdomstate->memory[j];
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denom += g_pm_activity_governor.pmcoeffs[i];
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}
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/* Compute and save the new activity value */
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y /= denom;
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index = pdomstate->mndx++;
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pdomstate->memory[index] = y;
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if (pdomstate->mndx >= CONFIG_PM_GOVERNOR_MEMORY - 1)
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{
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pdomstate->mndx = 0;
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}
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#else
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/* No smoothing */
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y = accum;
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#endif
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/* First check if increased activity should cause us to return to the
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* normal operating state. This would be unlikely for the lowest power
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* consumption states because the CPU is probably asleep. However this
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* probably does apply for the IDLE state.
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*/
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if (state > PM_NORMAL)
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{
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/* Get the table index for the current state (which will be the
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* current state minus one)
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*/
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index = state - 1;
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/* Has the threshold to return to normal power consumption state been
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* exceeded?
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*/
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if (y > g_pm_activity_governor.pmexitthresh[index])
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{
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/* Yes... reset the count and recommend the normal state. */
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pdomstate->btime = clock_systime_ticks();
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pdomstate->recommended = PM_NORMAL;
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return;
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}
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}
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/* Now, compare this new activity level to the thresholds and counts for
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* the next lower power consumption state. If we are already in the SLEEP
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* state, then there is nothing more to be done (in fact, I would be
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* surprised to be executing!).
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*/
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if (state < PM_SLEEP)
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{
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unsigned int nextstate;
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/* Get the next state and the table index for the next state (which
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* will be the current state)
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*/
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index = state;
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nextstate = state + 1;
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/* Has the threshold to enter the next lower power consumption state
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* been exceeded?
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*/
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if (y > g_pm_activity_governor.pmenterthresh[index])
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{
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/* No... reset the count and recommend the current state */
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pdomstate->btime = clock_systime_ticks();
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pdomstate->recommended = state;
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}
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/* Yes.. have we already recommended this state? If so, do nothing */
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else if (pdomstate->recommended < nextstate)
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{
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/* No.. calculate the count. Has it passed the count required
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* for a state transition?
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*/
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if (clock_systime_ticks() - pdomstate->btime >=
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g_pm_activity_governor.pmcount[index] * TIME_SLICE_TICKS)
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{
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/* Yes, recommend the new state and set up for the next
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* transition.
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*/
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pdomstate->btime = clock_systime_ticks();
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pdomstate->recommended = nextstate;
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}
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}
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}
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}
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static enum pm_state_e governor_checkstate(int domain)
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{
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FAR struct pm_domain_state_s *pdomstate;
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FAR struct pm_domain_s *pdom;
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clock_t now, elapsed;
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irqstate_t flags;
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int index;
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/* Get a convenience pointer to minimize all of the indexing */
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pdomstate = &g_pm_activity_governor.domain_states[domain];
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pdom = &g_pmdomains[domain];
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/* Check for the end of the current time slice. This must be performed
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* with interrupts disabled so that it does not conflict with the similar
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* logic in governor_activity().
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*/
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flags = pm_domain_lock(domain);
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/* Check the elapsed time. In periods of low activity, time slicing is
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* controlled by IDLE loop polling; in periods of higher activity, time
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* slicing is controlled by driver activity. In either case, the duration
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* of the time slice is only approximate; during times of heavy activity,
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* time slices may be become longer and the activity level may be over-
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* estimated.
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*/
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now = clock_systime_ticks();
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elapsed = now - pdomstate->stime;
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if (elapsed >= TIME_SLICE_TICKS)
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{
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int16_t accum;
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/* Sample the count, reset the time and count, and assess the PM
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* state. This is an atomic operation because interrupts are
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* still disabled.
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*/
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accum = pdomstate->accum;
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pdomstate->stime = now;
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pdomstate->accum = 0;
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governor_update(domain, accum);
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}
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/* Consider the possible power state lock here */
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for (index = 0; index < pdomstate->recommended; index++)
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{
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if (!dq_empty(&pdom->wakelock[index]))
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{
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pdomstate->recommended = index;
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break;
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}
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}
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pm_domain_unlock(domain, flags);
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return pdomstate->recommended;
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}
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static void governor_statechanged(int domain, enum pm_state_e newstate)
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{
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if (newstate != PM_RESTORE)
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{
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/* Start PM timer to decrease PM state */
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governor_timer(domain, newstate);
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}
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}
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static void governor_timer_cb(wdparm_t arg)
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{
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pm_auto_updatestate((int)arg);
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}
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/****************************************************************************
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* Name: governor_timer
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*
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* Description:
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* This internal function is called to start one timer to decrease power
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* state level.
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*
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* Input Parameters:
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* domain - The PM domain associated with the accumulator
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* newstate - The PM domain newstate
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*
|
|
* Returned Value:
|
|
* None.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static void governor_timer(int domain, enum pm_state_e newstate)
|
|
{
|
|
FAR struct pm_domain_state_s *pdomstate;
|
|
FAR struct pm_domain_s *pdom;
|
|
|
|
static const int pmtick[3] =
|
|
{
|
|
TIME_SLICE_TICKS * CONFIG_PM_GOVERNOR_IDLEENTER_COUNT,
|
|
TIME_SLICE_TICKS * CONFIG_PM_GOVERNOR_STANDBYENTER_COUNT,
|
|
TIME_SLICE_TICKS * CONFIG_PM_GOVERNOR_SLEEPENTER_COUNT
|
|
};
|
|
|
|
pdom = &g_pmdomains[domain];
|
|
pdomstate = &g_pm_activity_governor.domain_states[domain];
|
|
|
|
if (newstate < PM_SLEEP && dq_empty(&pdom->wakelock[newstate]))
|
|
{
|
|
sclock_t delay = pmtick[newstate] +
|
|
pdomstate->btime -
|
|
clock_systime_ticks();
|
|
sclock_t left = wd_gettime(&pdomstate->wdog);
|
|
|
|
if (delay <= 0)
|
|
{
|
|
delay = 1;
|
|
}
|
|
|
|
if (!WDOG_ISACTIVE(&pdomstate->wdog) ||
|
|
abs(delay - left) > PM_TIMER_GAP)
|
|
{
|
|
wd_start(&pdomstate->wdog, delay, governor_timer_cb,
|
|
(wdparm_t)domain);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
wd_cancel(&pdomstate->wdog);
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
FAR const struct pm_governor_s *pm_activity_governor_initialize(void)
|
|
{
|
|
return &g_pmgovernor;
|
|
}
|
|
|
|
#endif /* CONFIG_PM_GOVERNOR_ACTIVITY */
|