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Commit 8c4300c2 authored by Fabio Estevam's avatar Fabio Estevam Committed by Shawn Guo
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ARM: mx25: Add basic suspend/resume support 



Tested basic suspend/resume on a mx25pdk:

$ echo enabled > /sys/class/tty/ttymxc0/power/wakeup
$ echo mem > /sys/power/state

Then press any key in the serial console and the system wakes up.

Signed-off-by: default avatarFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent c5a890a4

arch/arm/mach-imx/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -3,7 +3,7 @@ obj-y := cpu.o system.o irq-common.o 
obj-$(CONFIG_SOC_IMX1) += mm-imx1.o

obj-$(CONFIG_SOC_IMX21) += mm-imx21.o



obj-$(CONFIG_SOC_IMX25) += cpu-imx25.o mach-imx25.o

obj-$(CONFIG_SOC_IMX25) += cpu-imx25.o mach-imx25.o pm-imx25.o



obj-$(CONFIG_SOC_IMX27) += cpu-imx27.o pm-imx27.o

obj-$(CONFIG_SOC_IMX27) += mm-imx27.o ehci-imx27.o

arch/arm/mach-imx/common.h

+1 −0
Original line number Diff line number Diff line
@@ -66,6 +66,7 @@ void imx_gpc_check_dt(void); 
void imx_gpc_set_arm_power_in_lpm(bool power_off);

void imx_gpc_set_arm_power_up_timing(u32 sw2iso, u32 sw);

void imx_gpc_set_arm_power_down_timing(u32 sw2iso, u32 sw);

void imx25_pm_init(void);



enum mxc_cpu_pwr_mode {

	WAIT_CLOCKED,		/* wfi only */

arch/arm/mach-imx/mach-imx25.c

+1 −0
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ static const char * const imx25_dt_board_compat[] __initconst = { 


DT_MACHINE_START(IMX25_DT, "Freescale i.MX25 (Device Tree Support)")

	.init_early	= imx25_init_early,

	.init_late      = imx25_pm_init,

	.init_irq	= mx25_init_irq,

	.dt_compat	= imx25_dt_board_compat,

MACHINE_END

arch/arm/mach-imx/pm-imx25.c

0 → 100644
+37 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2016 NXP Semiconductors

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#include <linux/kernel.h>

#include <linux/suspend.h>

#include <linux/io.h>



static int imx25_suspend_enter(suspend_state_t state)

{

	if (!IS_ENABLED(CONFIG_PM))

		return 0;



	switch (state) {

	case PM_SUSPEND_MEM:

		cpu_do_idle();

		break;

	default:

		return -EINVAL;

	}



	return 0;

}



static const struct platform_suspend_ops imx25_suspend_ops = {

	.enter = imx25_suspend_enter,

	.valid = suspend_valid_only_mem,

};



void __init imx25_pm_init(void)

{

	suspend_set_ops(&imx25_suspend_ops);

}