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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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>
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/* linux/arch/arm/mach-s3c64xx/cpuidle.c
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*
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* Copyright (c) 2011 Wolfson Microelectronics, plc
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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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/kernel.h>
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#include <linux/init.h>
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#include <linux/cpuidle.h>
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#include <linux/io.h>
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#include <linux/export.h>
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#include <linux/time.h>
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#include <asm/proc-fns.h>
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#include <mach/map.h>
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#include "regs-sys.h"
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#include "regs-syscon-power.h"
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static int s3c64xx_enter_idle(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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unsigned long tmp;
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/* Setup PWRCFG to enter idle mode */
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tmp = __raw_readl(S3C64XX_PWR_CFG);
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tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
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tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE;
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__raw_writel(tmp, S3C64XX_PWR_CFG);
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cpu_do_idle();
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return index;
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}
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static struct cpuidle_driver s3c64xx_cpuidle_driver = {
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.name = "s3c64xx_cpuidle",
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.owner = THIS_MODULE,
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.states = {
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{
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.enter = s3c64xx_enter_idle,
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.exit_latency = 1,
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.target_residency = 1,
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.name = "IDLE",
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.desc = "System active, ARM gated",
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},
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},
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.state_count = 1,
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};
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static int __init s3c64xx_init_cpuidle(void)
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{
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return cpuidle_register(&s3c64xx_cpuidle_driver, NULL);
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}
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device_initcall(s3c64xx_init_cpuidle);
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