@@ -38,6 +38,7 @@
compatible = "arm,cortex-a15";
reg = <0>;
cci-control-port = <&cci_control1>;
+ cpu-idle-states = <&CLUSTER_SLEEP_BIG>;
};
cpu1: cpu@1 {
@@ -45,6 +46,7 @@
compatible = "arm,cortex-a15";
reg = <1>;
cci-control-port = <&cci_control1>;
+ cpu-idle-states = <&CLUSTER_SLEEP_BIG>;
};
cpu2: cpu@2 {
@@ -52,6 +54,7 @@
compatible = "arm,cortex-a7";
reg = <0x100>;
cci-control-port = <&cci_control2>;
+ cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>;
};
cpu3: cpu@3 {
@@ -59,6 +62,7 @@
compatible = "arm,cortex-a7";
reg = <0x101>;
cci-control-port = <&cci_control2>;
+ cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>;
};
cpu4: cpu@4 {
@@ -66,6 +70,25 @@
compatible = "arm,cortex-a7";
reg = <0x102>;
cci-control-port = <&cci_control2>;
+ cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>;
+ };
+
+ idle-states {
+ CLUSTER_SLEEP_BIG: cluster-sleep-big {
+ compatible = "arm,idle-state";
+ local-timer-stop;
+ entry-latency-us = <1000>;
+ exit-latency-us = <700>;
+ min-residency-us = <2000>;
+ };
+
+ CLUSTER_SLEEP_LITTLE: cluster-sleep-little {
+ compatible = "arm,idle-state";
+ local-timer-stop;
+ entry-latency-us = <1000>;
+ exit-latency-us = <500>;
+ min-residency-us = <2500>;
+ };
};
};
@@ -7,6 +7,7 @@ config ARM_BIG_LITTLE_CPUIDLE
depends on MCPM
select ARM_CPU_SUSPEND
select CPU_IDLE_MULTIPLE_DRIVERS
+ select DT_IDLE_STATES
help
Select this option to enable CPU idle driver for big.LITTLE based
ARM systems. Driver manages CPUs coordination through MCPM and
@@ -24,6 +24,8 @@
#include <asm/smp_plat.h>
#include <asm/suspend.h>
+#include "dt_idle_states.h"
+
static int bl_enter_powerdown(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int idx);
@@ -171,7 +173,8 @@ static const struct of_device_id compatible_machine_match[] = {
static int __init bl_idle_init(void)
{
- int ret;
+ int ret, i;
+ struct cpuidle_driver *drv;
struct device_node *root = of_find_node_by_path("/");
if (!root)
@@ -197,6 +200,24 @@ static int __init bl_idle_init(void)
if (ret)
goto out_uninit_little;
+ /* Start at index 1, index 0 standard WFI */
+ ret = dt_init_idle_driver(&bl_idle_big_driver, 1);
+ if (ret < 0)
+ goto out_uninit_big;
+
+ /* Start at index 1, index 0 standard WFI */
+ ret = dt_init_idle_driver(&bl_idle_little_driver, 1);
+ if (ret < 0)
+ goto out_uninit_big;
+
+ drv = &bl_idle_big_driver;
+ for (i = 1; i < drv->state_count; i++)
+ drv->states[i].enter = bl_enter_powerdown;
+
+ drv = &bl_idle_little_driver;
+ for (i = 1; i < drv->state_count; i++)
+ drv->states[i].enter = bl_enter_powerdown;
+
ret = cpuidle_register(&bl_idle_little_driver, NULL);
if (ret)
goto out_uninit_big;
With the introduction of DT based idle states, CPUidle drivers for ARM can now initialize idle states data through properties in the device tree. This patch adds code to the big.LITTLE CPUidle driver to dynamically initialize idle states data through the updated device tree source file. Cc: Chander Kashyap <k.chander@samsung.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> --- arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts | 23 +++++++++++++++++++++++ drivers/cpuidle/Kconfig.arm | 1 + drivers/cpuidle/cpuidle-big_little.c | 23 ++++++++++++++++++++++- 3 files changed, 46 insertions(+), 1 deletion(-)