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cpuidle: psci: Simplify OF parsing of CPU idle state nodes

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Iterating through the idle state nodes in DT, to find out the number of
states that needs to be allocated is unnecessary, as it has already been
done from dt_init_idle_driver(). Therefore, drop the iteration and use the
number we already have at hand.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
This commit is contained in:
Ulf Hansson 2019-10-10 12:01:48 +02:00
parent 778f173eb4
commit 1595e4b09b
1 changed files with 17 additions and 18 deletions
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35
drivers/cpuidle/cpuidle-psci.c
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@ -73,30 +73,24 @@ static int __init psci_dt_parse_state_node(struct device_node *np, u32 *state)
return 0;
}
static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node, int cpu)
static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node,
unsigned int state_count, int cpu)
{
int i, ret = 0, count = 0;
int i, ret = 0;
u32 *psci_states;
struct device_node *state_node;
/* Count idle states */
while ((state_node = of_parse_phandle(cpu_node, "cpu-idle-states",
count))) {
count++;
of_node_put(state_node);
}
if (!count)
return -ENODEV;
count++; /* Add WFI state too */
psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL);
state_count++; /* Add WFI state too */
psci_states = kcalloc(state_count, sizeof(*psci_states), GFP_KERNEL);
if (!psci_states)
return -ENOMEM;
for (i = 1; i < count; i++) {
for (i = 1; i < state_count; i++) {
state_node = of_parse_phandle(cpu_node, "cpu-idle-states",
i - 1);
if (!state_node)
break;
ret = psci_dt_parse_state_node(state_node, &psci_states[i]);
of_node_put(state_node);
@ -106,6 +100,11 @@ static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node, int cpu)
pr_debug("psci-power-state %#x index %d\n", psci_states[i], i);
}
if (i != state_count) {
ret = -ENODEV;
goto free_mem;
}
/* Idle states parsed correctly, initialize per-cpu pointer */
per_cpu(psci_power_state, cpu) = psci_states;
return 0;
@ -115,7 +114,7 @@ static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node, int cpu)
return ret;
}
static __init int psci_cpu_init_idle(unsigned int cpu)
static __init int psci_cpu_init_idle(unsigned int cpu, unsigned int state_count)
{
struct device_node *cpu_node;
int ret;
@ -131,7 +130,7 @@ static __init int psci_cpu_init_idle(unsigned int cpu)
if (!cpu_node)
return -ENODEV;
ret = psci_dt_cpu_init_idle(cpu_node, cpu);
ret = psci_dt_cpu_init_idle(cpu_node, state_count, cpu);
of_node_put(cpu_node);
@ -187,7 +186,7 @@ static int __init psci_idle_init_cpu(int cpu)
/*
* Initialize PSCI idle states.
*/
ret = psci_cpu_init_idle(cpu);
ret = psci_cpu_init_idle(cpu, ret);
if (ret) {
pr_err("CPU %d failed to PSCI idle\n", cpu);
goto out_kfree_drv;