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authorSudeep Holla <sudeep.holla@arm.com>2019-10-24 16:18:34 +0100
committerUlf Hansson <ulf.hansson@linaro.org>2020-01-02 16:42:13 +0100
commit4386aa866d99e31243a53a75041dba7901b9ec61 (patch)
tree0c05c4a39e6905e25a4666f01242a033b2e042bd /drivers/cpuidle
parentfd6988496e79a6a4bdb514a4655d2920209eb85d (diff)
downloadlinux-4386aa866d99e31243a53a75041dba7901b9ec61.tar.bz2
cpuidle: psci: Align psci_power_state count with idle state count
Instead of allocating 'n-1' states in psci_power_state to manage 'n' idle states which include "ARM WFI" state, it would be simpler to have 1:1 mapping between psci_power_state and cpuidle driver states. ARM WFI state(i.e. idx == 0) is handled specially in the generic macro CPU_PM_CPU_IDLE_ENTER_PARAM and hence state[-1] is not possible. However for sake of code readability, it is better to have 1:1 mapping and not use [idx - 1] to access psci_power_state corresponding to driver cpuidle state for idx. psci_power_state[0] is default initialised to 0 and is never accessed while entering WFI state. Reported-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle-psci.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/cpuidle/cpuidle-psci.c b/drivers/cpuidle/cpuidle-psci.c
index f3c1a2396f98..361985f52ddd 100644
--- a/drivers/cpuidle/cpuidle-psci.c
+++ b/drivers/cpuidle/cpuidle-psci.c
@@ -30,7 +30,7 @@ static int psci_enter_idle_state(struct cpuidle_device *dev,
u32 *state = __this_cpu_read(psci_power_state);
return CPU_PM_CPU_IDLE_ENTER_PARAM(psci_cpu_suspend_enter,
- idx, state[idx - 1]);
+ idx, state[idx]);
}
static struct cpuidle_driver psci_idle_driver __initdata = {
@@ -89,12 +89,14 @@ static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node, int cpu)
if (!count)
return -ENODEV;
+ count++; /* Add WFI state too */
psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL);
if (!psci_states)
return -ENOMEM;
- for (i = 0; i < count; i++) {
- state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i);
+ for (i = 1; i < count; i++) {
+ state_node = of_parse_phandle(cpu_node, "cpu-idle-states",
+ i - 1);
ret = psci_dt_parse_state_node(state_node, &psci_states[i]);
of_node_put(state_node);