linux-kernel - [PATCH v3 2/3] ARM: cpuidle: refine cpuidle

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Message-ID: <1436430685-2202-3-git-send-email-jszhang@marvell.com>
Date:	Thu, 9 Jul 2015 16:31:24 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	<linux@....linux.org.uk>, <will.deacon@....com>,
	<mark.rutland@....com>, <daniel.lezcano@...aro.org>,
	<Catalin.Marinas@....com>, <Lorenzo.Pieralisi@....com>,
	<galak@...eaurora.org>, <agross@...eaurora.org>,
	<davidb@...eaurora.org>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Jisheng Zhang <jszhang@...vell.com>
Subject: [PATCH v3 2/3] ARM: cpuidle: refine cpuidle_ops member's parameters.

As for the suspend member function, the to-be-suspended cpu is always
the calling cpu itself, so the 'cpu' parameter may not be necessary, let
driver get 'cpu' itself if need.

As for the init member function, the device_node here may not be
necessary either, because we can get the node via. of_get_cpu_node().

Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
---
 arch/arm/include/asm/cpuidle.h |  6 +++---
 arch/arm/kernel/cpuidle.c      |  8 ++++----
 drivers/soc/qcom/spm.c         | 17 ++++++++++++-----
 3 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/arch/arm/include/asm/cpuidle.h b/arch/arm/include/asm/cpuidle.h
index 0f84249..ca5dfe6 100644
--- a/arch/arm/include/asm/cpuidle.h
+++ b/arch/arm/include/asm/cpuidle.h
@@ -30,8 +30,8 @@ static inline int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
 struct device_node;
 
 struct cpuidle_ops {
-	int (*suspend)(int cpu, unsigned long arg);
-	int (*init)(struct device_node *, int cpu);
+	int (*suspend)(unsigned long arg);
+	int (*init)(unsigned int cpu);
 };
 
 struct of_cpuidle_method {
@@ -46,6 +46,6 @@ struct of_cpuidle_method {
 
 extern int arm_cpuidle_suspend(int index);
 
-extern int arm_cpuidle_init(int cpu);
+extern int arm_cpuidle_init(unsigned int cpu);
 
 #endif
diff --git a/arch/arm/kernel/cpuidle.c b/arch/arm/kernel/cpuidle.c
index 318da33..7bc7bc6 100644
--- a/arch/arm/kernel/cpuidle.c
+++ b/arch/arm/kernel/cpuidle.c
@@ -53,10 +53,10 @@ int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
 int arm_cpuidle_suspend(int index)
 {
 	int ret = -EOPNOTSUPP;
-	int cpu = smp_processor_id();
+	unsigned int cpu = smp_processor_id();
 
 	if (cpuidle_ops[cpu].suspend)
-		ret = cpuidle_ops[cpu].suspend(cpu, index);
+		ret = cpuidle_ops[cpu].suspend(index);
 
 	return ret;
 }
@@ -134,7 +134,7 @@ static int __init arm_cpuidle_read_ops(struct device_node *dn, int cpu)
  *  -ENXIO if the HW reports a failure or a misconfiguration,
  *  -ENOMEM if the HW report an memory allocation failure 
  */
-int __init arm_cpuidle_init(int cpu)
+int __init arm_cpuidle_init(unsigned int cpu)
 {
 	struct device_node *cpu_node = of_cpu_device_node_get(cpu);
 	int ret;
@@ -144,7 +144,7 @@ int __init arm_cpuidle_init(int cpu)
 
 	ret = arm_cpuidle_read_ops(cpu_node, cpu);
 	if (!ret && cpuidle_ops[cpu].init)
-		ret = cpuidle_ops[cpu].init(cpu_node, cpu);
+		ret = cpuidle_ops[cpu].init(cpu);
 
 	of_node_put(cpu_node);
 
diff --git a/drivers/soc/qcom/spm.c b/drivers/soc/qcom/spm.c
index b04b05a..1649ec3 100644
--- a/drivers/soc/qcom/spm.c
+++ b/drivers/soc/qcom/spm.c
@@ -116,7 +116,7 @@ static const struct spm_reg_data spm_reg_8064_cpu = {
 
 static DEFINE_PER_CPU(struct spm_driver_data *, cpu_spm_drv);
 
-typedef int (*idle_fn)(int);
+typedef int (*idle_fn)(void);
 static DEFINE_PER_CPU(idle_fn*, qcom_idle_ops);
 
 static inline void spm_register_write(struct spm_driver_data *drv,
@@ -179,9 +179,10 @@ static int qcom_pm_collapse(unsigned long int unused)
 	return -1;
 }
 
-static int qcom_cpu_spc(int cpu)
+static int qcom_cpu_spc(void)
 {
 	int ret;
+	int cpu = smp_processor_id();
 	struct spm_driver_data *drv = per_cpu(cpu_spm_drv, cpu);
 
 	spm_set_low_power_mode(drv, PM_SLEEP_MODE_SPC);
@@ -197,9 +198,11 @@ static int qcom_cpu_spc(int cpu)
 	return ret;
 }
 
-static int qcom_idle_enter(int cpu, unsigned long index)
+static int qcom_idle_enter(unsigned long index)
 {
-	return per_cpu(qcom_idle_ops, cpu)[index](cpu);
+	unsigned int cpu = smp_processor_id();
+
+	return per_cpu(qcom_idle_ops, cpu)[index]();
 }
 
 static const struct of_device_id qcom_idle_state_match[] __initconst = {
@@ -207,7 +210,7 @@ static const struct of_device_id qcom_idle_state_match[] __initconst = {
 	{ },
 };
 
-static int __init qcom_cpuidle_init(struct device_node *cpu_node, int cpu)
+static int __init qcom_cpuidle_init(unsigned int cpu)
 {
 	const struct of_device_id *match_id;
 	struct device_node *state_node;
@@ -217,6 +220,10 @@ static int __init qcom_cpuidle_init(struct device_node *cpu_node, int cpu)
 	idle_fn *fns;
 	cpumask_t mask;
 	bool use_scm_power_down = false;
+	struct device_node *cpu_node = of_get_cpu_node(cpu, NULL);
+
+	if (!cpu_node)
+		return -ENODEV;
 
 	for (i = 0; ; i++) {
 		state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i);
-- 
2.1.4

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