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authorAnson Huang <b20788@freescale.com>2014-01-17 07:39:05 +0400
committerShawn Guo <shawn.guo@linaro.org>2014-03-05 06:35:10 +0400
commitdf595746fa69db2e36d89677df26ba51f9706c1b (patch)
tree802ca4cfdac8a8c048ea264d6351a5b95b9d2c05 /arch/arm/mach-imx/mach-imx6sl.c
parent02ae8e8682112166493675c0b4aaa57737dc01e4 (diff)
downloadlinux-df595746fa69db2e36d89677df26ba51f9706c1b.tar.xz
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/mach-imx6sl.c')
-rw-r--r--arch/arm/mach-imx/mach-imx6sl.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/arm/mach-imx/mach-imx6sl.c b/arch/arm/mach-imx/mach-imx6sl.c
index a26fdb2b1a6f..ad323385115c 100644
--- a/arch/arm/mach-imx/mach-imx6sl.c
+++ b/arch/arm/mach-imx/mach-imx6sl.c
@@ -58,8 +58,7 @@ static void __init imx6sl_init_machine(void)
imx6sl_fec_init();
imx_anatop_init();
- /* Reuse imx6q pm code */
- imx6q_pm_init();
+ imx6sl_pm_init();
}
static void __init imx6sl_init_irq(void)