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

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 @@ free_mem:
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;