[PATCH v8 7/8] drivers: cpuidle: initialize big.LITTLE driver through DT
From: Lorenzo Pieralisi <hidden>
Date: 2014-09-01 15:28:43
Also in:
linux-devicetree, linux-pm
Subsystem:
cpu idle time management framework, cpuidle driver - arm big little, the rest · Maintainers:
"Rafael J. Wysocki", Daniel Lezcano, Lorenzo Pieralisi, Linus Torvalds
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 <redacted> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <redacted> --- arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts | 23 +++++++++++++++++++++++ drivers/cpuidle/Kconfig.arm | 1 + drivers/cpuidle/cpuidle-big_little.c | 19 +++++++++++++++++++ 3 files changed, 43 insertions(+)
diff --git a/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts b/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts
index a25c262..322fd15 100644
--- a/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts
+++ b/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts@@ -38,6 +38,7 @@ compatible = "arm,cortex-a15"; reg = <0>; cci-control-port = <&cci_control1>; + cpu-idle-states = <&CLUSTER_SLEEP_BIG>; }; cpu1: cpu at 1 {
@@ -45,6 +46,7 @@ compatible = "arm,cortex-a15"; reg = <1>; cci-control-port = <&cci_control1>; + cpu-idle-states = <&CLUSTER_SLEEP_BIG>; }; cpu2: cpu at 2 {
@@ -52,6 +54,7 @@ compatible = "arm,cortex-a7"; reg = <0x100>; cci-control-port = <&cci_control2>; + cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>; }; cpu3: cpu at 3 {
@@ -59,6 +62,7 @@ compatible = "arm,cortex-a7"; reg = <0x101>; cci-control-port = <&cci_control2>; + cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>; }; cpu4: cpu at 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>; + }; }; };
diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
index 38cff69..e339c7f 100644
--- a/drivers/cpuidle/Kconfig.arm
+++ b/drivers/cpuidle/Kconfig.arm@@ -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
diff --git a/drivers/cpuidle/cpuidle-big_little.c b/drivers/cpuidle/cpuidle-big_little.c
index ef94c3b..85d09bc 100644
--- a/drivers/cpuidle/cpuidle-big_little.c
+++ b/drivers/cpuidle/cpuidle-big_little.c@@ -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,
@@ -190,6 +198,17 @@ 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@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;
--
1.9.1