redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

drivers: cpuidle: initialize big.LITTLE driver through DT 

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>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
hifive-unleashed-5.1
Lorenzo Pieralisi 2014-06-24 16:20:28 +01:00 committed by Daniel Lezcano
parent 3299b63de3
commit d2e5c871ed
3 changed files with 43 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts
View File

@ -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>;
};
};
};

1
drivers/cpuidle/Kconfig.arm
View File

@ -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

19
drivers/cpuidle/cpuidle-big_little.c
View File

@ -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);
@ -73,6 +75,12 @@ static struct cpuidle_driver bl_idle_little_driver = {
.state_count = 2,
};
static const struct of_device_id bl_idle_state_match[] __initconst = {
{ .compatible = "arm,idle-state",
.data = bl_enter_powerdown },
{ },
};
static struct cpuidle_driver bl_idle_big_driver = {
.name = "big_idle",
.owner = THIS_MODULE,
@ -191,6 +199,17 @@ 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, bl_idle_state_match, 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,
bl_idle_state_match, 1);
if (ret < 0)
goto out_uninit_big;
ret = cpuidle_register(&bl_idle_little_driver, NULL);
if (ret)
goto out_uninit_big;