[PATCH v10 6/7] arm64: add support for ACPI Low Power Idle(LPI)

Sudeep Holla
2016-07-19T17:52:58Z

This patch adds appropriate callbacks to support ACPI Low Power Idle
(LPI) on ARM64.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
arch/arm64/kernel/cpuidle.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/arch/arm64/kernel/cpuidle.c b/arch/arm64/kernel/cpuidle.c
index 06786fdaadeb..75a0f8acef66 100644
--- a/arch/arm64/kernel/cpuidle.c
+++ b/arch/arm64/kernel/cpuidle.c
@@ -9,6 +9,9 @@
* published by the Free Software Foundation.
*/

+#include <linux/acpi.h>
+#include <linux/cpuidle.h>
+#include <linux/cpu_pm.h>
#include <linux/of.h>
#include <linux/of_device.h>

@@ -39,3 +42,18 @@ int arm_cpuidle_suspend(int index)

return cpu_ops[cpu]->cpu_suspend(index);
}
+
+#ifdef CONFIG_ACPI
+
+#include <acpi/processor.h>
+
+int acpi_processor_ffh_lpi_probe(unsigned int cpu)
+{
+ return arm_cpuidle_init(cpu);
+}
+
+int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi)
+{
+ return CPU_PM_CPU_IDLE_ENTER(arm_cpuidle_suspend, lpi->index);
+}
+#endif
--
2.7.4