mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
6d45a4028c
This patch adds cpuidle support for i.MX7ULP, 3 cpuidle states supported as below: 1. WFI, just ARM wfi; 2. WAIT mode, mapped to SoC's partial stop mode #3; 3. STOP mode, mapped to SoC's partial stop mode #1. In WAIT mode, system clock and bus clock will be enabled; In STOP mode, system clock and bus clock will be disabled. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
61 lines
1.1 KiB
C
61 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2016 Freescale Semiconductor, Inc.
|
|
* Copyright 2017-2018 NXP
|
|
* Anson Huang <Anson.Huang@nxp.com>
|
|
*/
|
|
|
|
#include <linux/cpuidle.h>
|
|
#include <linux/module.h>
|
|
#include <asm/cpuidle.h>
|
|
|
|
#include "common.h"
|
|
#include "cpuidle.h"
|
|
|
|
static int imx7ulp_enter_wait(struct cpuidle_device *dev,
|
|
struct cpuidle_driver *drv, int index)
|
|
{
|
|
if (index == 1)
|
|
imx7ulp_set_lpm(ULP_PM_WAIT);
|
|
else
|
|
imx7ulp_set_lpm(ULP_PM_STOP);
|
|
|
|
cpu_do_idle();
|
|
|
|
imx7ulp_set_lpm(ULP_PM_RUN);
|
|
|
|
return index;
|
|
}
|
|
|
|
static struct cpuidle_driver imx7ulp_cpuidle_driver = {
|
|
.name = "imx7ulp_cpuidle",
|
|
.owner = THIS_MODULE,
|
|
.states = {
|
|
/* WFI */
|
|
ARM_CPUIDLE_WFI_STATE,
|
|
/* WAIT */
|
|
{
|
|
.exit_latency = 50,
|
|
.target_residency = 75,
|
|
.enter = imx7ulp_enter_wait,
|
|
.name = "WAIT",
|
|
.desc = "PSTOP2",
|
|
},
|
|
/* STOP */
|
|
{
|
|
.exit_latency = 100,
|
|
.target_residency = 150,
|
|
.enter = imx7ulp_enter_wait,
|
|
.name = "STOP",
|
|
.desc = "PSTOP1",
|
|
},
|
|
},
|
|
.state_count = 3,
|
|
.safe_state_index = 0,
|
|
};
|
|
|
|
int __init imx7ulp_cpuidle_init(void)
|
|
{
|
|
return cpuidle_register(&imx7ulp_cpuidle_driver, NULL);
|
|
}
|