Commit 3ac804e3 authored by Fabio Estevam's avatar Fabio Estevam Committed by Sascha Hauer
Browse files

ARM: mx3: Let mx31 and mx35 enter in LPM mode in WFI 



The LPM field of register CCMR is used to select the mode that the processor will run
when it goes to WFI.

When mx31 enters in WFI mode the LPM field is at its reset value of 0,
which configures the mx31 to enter in "wait mode".

On mx35, the LPM field on mx35 is also at 0 after reset, which corresponds
to "run mode" instead of "wait mode".

Instead of relying on the reset value of LPM to set the low power mode for
WFI, configure mx31 and mx35 to run in "wait mode"

Reported-by: default avatarBenoit Thebaudeau <benoit.thebaudeau@advansee.com>
Signed-off-by: default avatarFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
parent d65b4e98

arch/arm/mach-imx/Makefile

+2 −2
Original line number Diff line number Diff line
@@ -8,8 +8,8 @@ obj-$(CONFIG_SOC_IMX25) += clock-imx25.o mm-imx25.o ehci-imx25.o cpu-imx25.o 
obj-$(CONFIG_SOC_IMX27) += cpu-imx27.o pm-imx27.o

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



obj-$(CONFIG_SOC_IMX31) += mm-imx3.o cpu-imx31.o clock-imx31.o iomux-imx31.o ehci-imx31.o

obj-$(CONFIG_SOC_IMX35) += mm-imx3.o cpu-imx35.o clock-imx35.o ehci-imx35.o

obj-$(CONFIG_SOC_IMX31) += mm-imx3.o cpu-imx31.o clock-imx31.o iomux-imx31.o ehci-imx31.o pm-imx3.o

obj-$(CONFIG_SOC_IMX35) += mm-imx3.o cpu-imx35.o clock-imx35.o ehci-imx35.o pm-imx3.o



obj-$(CONFIG_SOC_IMX5) += cpu-imx5.o mm-imx5.o clock-mx51-mx53.o ehci-imx5.o pm-imx5.o cpu_op-mx51.o

arch/arm/mach-imx/crmregs-imx31.h

+1 −0
Original line number Diff line number Diff line
@@ -64,6 +64,7 @@ 
#define MXC_CCM_CCMR_SSI2S_MASK                 (0x3 << 21)

#define MXC_CCM_CCMR_LPM_OFFSET                 14

#define MXC_CCM_CCMR_LPM_MASK                   (0x3 << 14)

#define MXC_CCM_CCMR_LPM_WAIT_MX35		(0x1 << 14)

#define MXC_CCM_CCMR_FIRS_OFFSET                11

#define MXC_CCM_CCMR_FIRS_MASK                  (0x3 << 11)

#define MXC_CCM_CCMR_UPE                        (1 << 9)

arch/arm/mach-imx/mm-imx3.c

+2 −0
Original line number Diff line number Diff line
@@ -34,6 +34,8 @@ static void imx3_idle(void) 
{

	unsigned long reg = 0;



	mx3_cpu_lp_set(MX3_WAIT);



	if (!need_resched())

		__asm__ __volatile__(

			/* disable I and D cache */

arch/arm/mach-imx/pm-imx3.c

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

 *  Copyright (C) 2012 Freescale Semiconductor, Inc. All Rights Reserved.

 *

 * The code contained herein is licensed under the GNU General Public

 * License. You may obtain a copy of the GNU General Public License

 * Version 2 or later at the following locations:

 *

 * http://www.opensource.org/licenses/gpl-license.html

 * http://www.gnu.org/copyleft/gpl.html

 */

#include <linux/io.h>

#include <mach/common.h>

#include <mach/hardware.h>

#include <mach/devices-common.h>

#include "crmregs-imx3.h"



/*

 * Set cpu low power mode before WFI instruction. This function is called

 * mx3 because it can be used for mx31 and mx35.

 * Currently only WAIT_MODE is supported.

 */

void mx3_cpu_lp_set(enum mx3_cpu_pwr_mode mode)

{

	int reg = __raw_readl(MXC_CCM_CCMR);

	reg &= ~MXC_CCM_CCMR_LPM_MASK;



	switch (mode) {

	case MX3_WAIT:

		if (cpu_is_mx35())

			reg |= MXC_CCM_CCMR_LPM_WAIT_MX35;

		__raw_writel(reg, MXC_CCM_CCMR);

		break;

	default:

		pr_err("Unknown cpu power mode: %d\n", mode);

		return;

	}

}

arch/arm/plat-mxc/include/mach/common.h

+8 −0
Original line number Diff line number Diff line
@@ -84,6 +84,14 @@ enum mxc_cpu_pwr_mode { 
	STOP_POWER_OFF,		/* STOP + SRPG */

};



enum mx3_cpu_pwr_mode {

	MX3_RUN,

	MX3_WAIT,

	MX3_DOZE,

	MX3_SLEEP,

};



extern void mx3_cpu_lp_set(enum mx3_cpu_pwr_mode mode);

extern void mx5_cpu_lp_set(enum mxc_cpu_pwr_mode mode);

extern void imx_print_silicon_rev(const char *cpu, int srev);

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