PM / OPP: Add clock-latency-ns support
With "operating-points-v2" bindings, clock-latency is defined per OPP. Users of this value expect a single value which defines the latency to switch to any clock rate. Find maximum clock-latency-ns from the OPP table to service requests from such users. Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
parent
274659029c
commit
3ca9bb33c6
@ -57,6 +57,8 @@
|
||||
* @u_volt_min: Minimum voltage in microvolts corresponding to this OPP
|
||||
* @u_volt_max: Maximum voltage in microvolts corresponding to this OPP
|
||||
* @u_amp: Maximum current drawn by the device in microamperes
|
||||
* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
|
||||
* frequency from any other OPP's frequency.
|
||||
* @dev_opp: points back to the device_opp struct this opp belongs to
|
||||
* @rcu_head: RCU callback head used for deferred freeing
|
||||
* @np: OPP's device node.
|
||||
@ -75,6 +77,7 @@ struct dev_pm_opp {
|
||||
unsigned long u_volt_min;
|
||||
unsigned long u_volt_max;
|
||||
unsigned long u_amp;
|
||||
unsigned long clock_latency_ns;
|
||||
|
||||
struct device_opp *dev_opp;
|
||||
struct rcu_head rcu_head;
|
||||
@ -109,6 +112,8 @@ struct device_opp {
|
||||
struct srcu_notifier_head srcu_head;
|
||||
struct rcu_head rcu_head;
|
||||
struct list_head opp_list;
|
||||
|
||||
unsigned long clock_latency_ns_max;
|
||||
};
|
||||
|
||||
/*
|
||||
@ -225,6 +230,32 @@ unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
|
||||
|
||||
/**
|
||||
* dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds
|
||||
* @dev: device for which we do this operation
|
||||
*
|
||||
* Return: This function returns the max clock latency in nanoseconds.
|
||||
*
|
||||
* Locking: This function takes rcu_read_lock().
|
||||
*/
|
||||
unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
|
||||
{
|
||||
struct device_opp *dev_opp;
|
||||
unsigned long clock_latency_ns;
|
||||
|
||||
rcu_read_lock();
|
||||
|
||||
dev_opp = _find_device_opp(dev);
|
||||
if (IS_ERR(dev_opp))
|
||||
clock_latency_ns = 0;
|
||||
else
|
||||
clock_latency_ns = dev_opp->clock_latency_ns_max;
|
||||
|
||||
rcu_read_unlock();
|
||||
return clock_latency_ns;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
|
||||
|
||||
/**
|
||||
* dev_pm_opp_get_opp_count() - Get number of opps available in the opp list
|
||||
* @dev: device for which we do this operation
|
||||
@ -779,6 +810,8 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
|
||||
new_opp->np = np;
|
||||
new_opp->dynamic = false;
|
||||
new_opp->available = true;
|
||||
of_property_read_u32(np, "clock-latency-ns",
|
||||
(u32 *)&new_opp->clock_latency_ns);
|
||||
|
||||
ret = opp_get_microvolt(new_opp, dev);
|
||||
if (ret)
|
||||
@ -790,11 +823,15 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
|
||||
if (ret)
|
||||
goto free_opp;
|
||||
|
||||
if (new_opp->clock_latency_ns > dev_opp->clock_latency_ns_max)
|
||||
dev_opp->clock_latency_ns_max = new_opp->clock_latency_ns;
|
||||
|
||||
mutex_unlock(&dev_opp_list_lock);
|
||||
|
||||
pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu\n",
|
||||
pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n",
|
||||
__func__, new_opp->turbo, new_opp->rate, new_opp->u_volt,
|
||||
new_opp->u_volt_min, new_opp->u_volt_max);
|
||||
new_opp->u_volt_min, new_opp->u_volt_max,
|
||||
new_opp->clock_latency_ns);
|
||||
|
||||
/*
|
||||
* Notify the changes in the availability of the operable
|
||||
|
@ -31,6 +31,7 @@ unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
|
||||
unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
|
||||
|
||||
int dev_pm_opp_get_opp_count(struct device *dev);
|
||||
unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);
|
||||
|
||||
struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
|
||||
unsigned long freq,
|
||||
@ -67,6 +68,11 @@ static inline int dev_pm_opp_get_opp_count(struct device *dev)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
|
||||
unsigned long freq, bool available)
|
||||
{
|
||||
|
Loading…
Reference in New Issue
Block a user