diff options
| author | Anson Huang <b20788@freescale.com> | 2014-01-17 11:39:05 +0800 |
|---|---|---|
| committer | Shawn Guo <shawn.guo@linaro.org> | 2014-03-05 10:35:10 +0800 |
| commit | df595746fa69db2e36d89677df26ba51f9706c1b (patch) | |
| tree | 802ca4cfdac8a8c048ea264d6351a5b95b9d2c05 /arch/arm/mach-imx/Makefile | |
| parent | 02ae8e8682112166493675c0b4aaa57737dc01e4 (diff) | |
ARM: imx: add suspend in ocram support for i.mx6q
When system enter suspend, we can set the DDR IO to
high-Z state to save DDR IOs' power consumption, this
operation can save many power(from ~26mA@1.5V to ~15mA@1.5V,
measured on i.MX6Q SabreSD board, R25) of DDR IOs. To
achieve that, we need to copy the suspend code to ocram
and run the low level hardware related code(set DDR IOs
to high-Z state) in ocram.
If there is no ocram space available, then system will
still do suspend in external DDR, hence no DDR IOs will
be set to high-Z.
The OCRAM usage layout is as below,
ocram suspend region(4K currently):
======================== high address ======================
.
.
.
^
^
^
imx6_suspend code
PM_INFO structure(imx6_cpu_pm_info)
======================== low address =======================
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Diffstat (limited to 'arch/arm/mach-imx/Makefile')
| -rw-r--r-- | arch/arm/mach-imx/Makefile | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile index 21114a9a2ae7..48b47aa6224a 100644 --- a/arch/arm/mach-imx/Makefile +++ b/arch/arm/mach-imx/Makefile @@ -102,7 +102,8 @@ obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o obj-$(CONFIG_SOC_IMX6Q) += clk-imx6q.o mach-imx6q.o obj-$(CONFIG_SOC_IMX6SL) += clk-imx6sl.o mach-imx6sl.o -obj-$(CONFIG_SOC_IMX6Q) += pm-imx6q.o headsmp.o +AFLAGS_suspend-imx6.o :=-Wa,-march=armv7-a +obj-$(CONFIG_SOC_IMX6Q) += pm-imx6q.o headsmp.o suspend-imx6.o # i.MX6SL reuses i.MX6Q code obj-$(CONFIG_SOC_IMX6SL) += pm-imx6q.o headsmp.o |