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authorSantosh Shilimkar <santosh.shilimkar@ti.com>2011-08-16 16:01:40 +0400
committerKevin Hilman <khilman@ti.com>2011-12-08 23:29:01 +0400
commit98272660970a71e21ad1992f695f75b780de833c (patch)
tree602ff2dc1ba89f46c195a16bf55116d7197288bf /arch/arm/mach-omap2/pm44xx.c
parent137d105d50f6e6c373c1aa759f59045e6239cf66 (diff)
downloadlinux-98272660970a71e21ad1992f695f75b780de833c.tar.xz
ARM: OMAP4: PM: Add CPUidle support
Add OMAP4 CPUIDLE support. CPU1 is left with defualt idle and the low power state for it is managed via cpu-hotplug. This patch adds MPUSS low power states in cpuidle. C1 - CPU0 ON + CPU1 ON + MPU ON C2 - CPU0 OFF + CPU1 OFF + MPU CSWR C3 - CPU0 OFF + CPU1 OFF + MPU OSWR OMAP4460 onwards, MPUSS power domain doesn't support OFF state any more anymore just like CORE power domain. The deepest state supported is OSWr. Ofcourse when MPUSS and CORE PD transitions to OSWR along with device off mode, even the memory contemts are lost which is as good as the PD off state. On OMAP4 because of hardware constraints, no low power states are targeted when both CPUs are online and in SMP mode. The low power states are attempted only when secondary CPU gets offline to OFF through hotplug infrastructure. Thanks to Nicole Chalhoub <n-chalhoub@ti.com> for doing exhaustive C-state latency profiling. Signed-off-by: Rajendra Nayak <rnayak@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Jean Pihet <j-pihet@ti.com> Reviewed-by: Kevin Hilman <khilman@ti.com> Tested-by: Vishwanath BS <vishwanath.bs@ti.com> Signed-off-by: Kevin Hilman <khilman@ti.com>
Diffstat (limited to 'arch/arm/mach-omap2/pm44xx.c')
-rw-r--r--arch/arm/mach-omap2/pm44xx.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c
index 92daae07d634..c264ef7219c1 100644
--- a/arch/arm/mach-omap2/pm44xx.c
+++ b/arch/arm/mach-omap2/pm44xx.c
@@ -258,6 +258,8 @@ static int __init omap4_pm_init(void)
/* Overwrite the default arch_idle() */
pm_idle = omap_default_idle;
+ omap4_idle_init();
+
err2:
return ret;
}