47b2e00d51
If sched lock before irq save, and irq handler do post, scheduler will be delayed after WFI until next sched unlock. which is not acceptable. Signed-off-by: buxiasen <buxiasen@xiaomi.com>
78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
/****************************************************************************
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* drivers/power/pm/pm_idle.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 <nuttx/power/pm.h>
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#include <sched/sched.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pm_idle
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*
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* Description:
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* Standard pm idle work flow for up_idle, for not smp case.
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*
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* Input Parameters:
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* handler - The execution after PM_IDLE_DOMAIN state changed.
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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void pm_idle(pm_idle_handler_t handler)
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{
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enum pm_state_e newstate;
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irqstate_t flags;
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int ret;
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/* If sched lock before irq save, and irq handler do post, scheduler will
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* be delayed after WFI until next sched unlock. which is not acceptable.
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*/
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flags = up_irq_save();
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sched_lock();
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newstate = pm_checkstate(PM_IDLE_DOMAIN);
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ret = pm_changestate(PM_IDLE_DOMAIN, newstate);
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if (ret < 0)
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{
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newstate = PM_NORMAL;
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}
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handler(newstate);
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pm_changestate(PM_IDLE_DOMAIN, PM_RESTORE);
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/* If there is pending irq, enable irq make handlers finish all execution
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* will be better decrease scheduler context switch times.
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*/
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up_irq_restore(flags);
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sched_unlock();
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}
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