Commit ff23ab24 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki

Merge branches 'pm-cpufreq' and 'pm-cpuidle'

* pm-cpufreq:
  cpufreq: fix a NULL pointer dereference in __cpufreq_governor()
  cpufreq-dt: defer probing if OPP table is not ready

* pm-cpuidle:
  cpuidle / ACPI: remove unused CPUIDLE_FLAG_TIME_INVALID
  cpuidle: ladder: Better idle duration measurement without using CPUIDLE_FLAG_TIME_INVALID
  cpuidle: menu: Better idle duration measurement without using CPUIDLE_FLAG_TIME_INVALID
......@@ -985,8 +985,6 @@ static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
state->flags = 0;
switch (cx->type) {
case ACPI_STATE_C1:
if (cx->entry_method != ACPI_CSTATE_FFH)
state->flags |= CPUIDLE_FLAG_TIME_INVALID;
state->enter = acpi_idle_enter_c1;
state->enter_dead = acpi_idle_play_dead;
......
......@@ -211,6 +211,17 @@ static int cpufreq_init(struct cpufreq_policy *policy)
/* OPPs might be populated at runtime, don't check for error here */
of_init_opp_table(cpu_dev);
/*
* But we need OPP table to function so if it is not there let's
* give platform code chance to provide it for us.
*/
ret = dev_pm_opp_get_opp_count(cpu_dev);
if (ret <= 0) {
pr_debug("OPP table is not ready, deferring probe\n");
ret = -EPROBE_DEFER;
goto out_free_opp;
}
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv) {
ret = -ENOMEM;
......
......@@ -2028,6 +2028,12 @@ static int __cpufreq_governor(struct cpufreq_policy *policy,
/* Don't start any governor operations if we are entering suspend */
if (cpufreq_suspended)
return 0;
/*
* Governor might not be initiated here if ACPI _PPC changed
* notification happened, so check it.
*/
if (!policy->governor)
return -EINVAL;
if (policy->governor->max_transition_latency &&
policy->cpuinfo.transition_latency >
......
......@@ -79,12 +79,7 @@ static int ladder_select_state(struct cpuidle_driver *drv,
last_state = &ldev->states[last_idx];
if (!(drv->states[last_idx].flags & CPUIDLE_FLAG_TIME_INVALID)) {
last_residency = cpuidle_get_last_residency(dev) - \
drv->states[last_idx].exit_latency;
}
else
last_residency = last_state->threshold.promotion_time + 1;
last_residency = cpuidle_get_last_residency(dev) - drv->states[last_idx].exit_latency;
/* consider promotion */
if (last_idx < drv->state_count - 1 &&
......
......@@ -396,8 +396,8 @@ static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev)
* power state and occurrence of the wakeup event.
*
* If the entered idle state didn't support residency measurements,
* we are basically lost in the dark how much time passed.
* As a compromise, assume we slept for the whole expected time.
* we use them anyway if they are short, and if long,
* truncate to the whole expected time.
*
* Any measured amount of time will include the exit latency.
* Since we are interested in when the wakeup begun, not when it
......@@ -405,22 +405,17 @@ static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev)
* the measured amount of time is less than the exit latency,
* assume the state was never reached and the exit latency is 0.
*/
if (unlikely(target->flags & CPUIDLE_FLAG_TIME_INVALID)) {
/* Use timer value as is */
measured_us = data->next_timer_us;
} else {
/* Use measured value */
measured_us = cpuidle_get_last_residency(dev);
/* measured value */
measured_us = cpuidle_get_last_residency(dev);
/* Deduct exit latency */
if (measured_us > target->exit_latency)
measured_us -= target->exit_latency;
/* Deduct exit latency */
if (measured_us > target->exit_latency)
measured_us -= target->exit_latency;
/* Make sure our coefficients do not exceed unity */
if (measured_us > data->next_timer_us)
measured_us = data->next_timer_us;
}
/* Make sure our coefficients do not exceed unity */
if (measured_us > data->next_timer_us)
measured_us = data->next_timer_us;
/* Update our correction ratio */
new_factor = data->correction_factor[data->bucket];
......
......@@ -53,7 +53,6 @@ struct cpuidle_state {
};
/* Idle State Flags */
#define CPUIDLE_FLAG_TIME_INVALID (0x01) /* is residency time measurable? */
#define CPUIDLE_FLAG_COUPLED (0x02) /* state applies to multiple cpus */
#define CPUIDLE_FLAG_TIMER_STOP (0x04) /* timer is stopped on this state */
......@@ -89,8 +88,6 @@ DECLARE_PER_CPU(struct cpuidle_device, cpuidle_dev);
/**
* cpuidle_get_last_residency - retrieves the last state's residency time
* @dev: the target CPU
*
* NOTE: this value is invalid if CPUIDLE_FLAG_TIME_INVALID is set
*/
static inline int cpuidle_get_last_residency(struct cpuidle_device *dev)
{
......
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