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b82b6cca48
The only place where the time is invalid is when the ACPI_CSTATE_FFH entry method is not set. Otherwise for all the drivers, the time can be correctly measured. Instead of duplicating the CPUIDLE_FLAG_TIME_VALID flag in all the drivers for all the states, just invert the logic by replacing it by the flag CPUIDLE_FLAG_TIME_INVALID, hence we can set this flag only for the acpi idle driver, remove the former flag from all the drivers and invert the logic with this flag in the different governor. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/*
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* Copyright (C) 2012 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/cpuidle.h>
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#include <linux/module.h>
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#include <asm/cpuidle.h>
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#include <asm/proc-fns.h>
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#include "common.h"
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#include "cpuidle.h"
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#include "hardware.h"
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static atomic_t master = ATOMIC_INIT(0);
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static DEFINE_SPINLOCK(master_lock);
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static int imx6q_enter_wait(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index)
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{
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if (atomic_inc_return(&master) == num_online_cpus()) {
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/*
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* With this lock, we prevent other cpu to exit and enter
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* this function again and become the master.
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*/
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if (!spin_trylock(&master_lock))
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goto idle;
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imx6q_set_lpm(WAIT_UNCLOCKED);
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cpu_do_idle();
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imx6q_set_lpm(WAIT_CLOCKED);
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spin_unlock(&master_lock);
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goto done;
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}
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idle:
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cpu_do_idle();
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done:
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atomic_dec(&master);
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return index;
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}
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static struct cpuidle_driver imx6q_cpuidle_driver = {
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.name = "imx6q_cpuidle",
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.owner = THIS_MODULE,
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.states = {
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/* WFI */
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ARM_CPUIDLE_WFI_STATE,
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/* WAIT */
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{
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.exit_latency = 50,
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.target_residency = 75,
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.flags = CPUIDLE_FLAG_TIMER_STOP,
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.enter = imx6q_enter_wait,
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.name = "WAIT",
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.desc = "Clock off",
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},
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},
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.state_count = 2,
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.safe_state_index = 0,
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};
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int __init imx6q_cpuidle_init(void)
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{
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/* Set INT_MEM_CLK_LPM bit to get a reliable WAIT mode support */
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imx6q_set_int_mem_clk_lpm(true);
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return cpuidle_register(&imx6q_cpuidle_driver, NULL);
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}
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