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ANDROID: PM / OPP: cpufreq-dt: Move power estimation function

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The cpufreq-dt driver has a function estimating the power of CPUs using
the dynamic-power-coefficient DT binding and the parameters of PM_OPP.
Since this function can be useful to other drivers, relocate it to
PM_OPP which is already a dependency anyway.

Change-Id: I34f8f9cd9433c622c82f23f32ae9968a096a4390
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
This commit is contained in:
Quentin Perret
2018-09-12 14:49:58 +01:00
parent 23977789b5
commit d326aa36e6
3 changed files with 47 additions and 42 deletions
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43
drivers/cpufreq/cpufreq-dt.c
View File

@@ -150,50 +150,9 @@ static int resources_available(void)
return 0;
}
static int __maybe_unused of_est_power(unsigned long *mW, unsigned long *KHz,
int cpu)
{
unsigned long mV, Hz, MHz;
struct device *cpu_dev;
struct dev_pm_opp *opp;
struct device_node *np;
u32 cap;
u64 tmp;
cpu_dev = get_cpu_device(cpu);
if (!cpu_dev)
return -ENODEV;
np = of_node_get(cpu_dev->of_node);
if (!np)
return -EINVAL;
if (of_property_read_u32(np, "dynamic-power-coefficient", &cap))
return -EINVAL;
Hz = *KHz * 1000;
opp = dev_pm_opp_find_freq_ceil(cpu_dev, &Hz);
if (IS_ERR(opp))
return -EINVAL;
mV = dev_pm_opp_get_voltage(opp) / 1000;
dev_pm_opp_put(opp);
if (!mV)
return -EINVAL;
MHz = Hz / 1000000;
tmp = (u64)cap * mV * mV * MHz;
do_div(tmp, 1000000000);
*mW = (unsigned long)tmp;
*KHz = Hz / 1000;
return 0;
}
static int cpufreq_init(struct cpufreq_policy *policy)
{
struct em_data_callback em_cb = EM_DATA_CB(of_est_power);
struct em_data_callback em_cb = EM_DATA_CB(of_dev_pm_opp_get_cpu_power);
struct cpufreq_frequency_table *freq_table;
struct opp_table *opp_table = NULL;
struct private_data *priv;

41
drivers/opp/of.c
View File

@@ -777,3 +777,44 @@ struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
return of_node_get(opp->np);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node);
int of_dev_pm_opp_get_cpu_power(unsigned long *mW, unsigned long *KHz, int cpu)
{
unsigned long mV, Hz, MHz;
struct device *cpu_dev;
struct dev_pm_opp *opp;
struct device_node *np;
u32 cap;
u64 tmp;
cpu_dev = get_cpu_device(cpu);
if (!cpu_dev)
return -ENODEV;
np = of_node_get(cpu_dev->of_node);
if (!np)
return -EINVAL;
if (of_property_read_u32(np, "dynamic-power-coefficient", &cap))
return -EINVAL;
Hz = *KHz * 1000;
opp = dev_pm_opp_find_freq_ceil(cpu_dev, &Hz);
if (IS_ERR(opp))
return -EINVAL;
mV = dev_pm_opp_get_voltage(opp) / 1000;
dev_pm_opp_put(opp);
if (!mV)
return -EINVAL;
MHz = Hz / 1000000;
tmp = (u64)cap * mV * mV * MHz;
do_div(tmp, 1000000000);
*mW = (unsigned long)tmp;
*KHz = Hz / 1000;
return 0;
}
EXPORT_SYMBOL_GPL(of_dev_pm_opp_get_cpu_power);

5
include/linux/pm_opp.h
View File

@@ -301,6 +301,7 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpuma
struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev);
struct dev_pm_opp *of_dev_pm_opp_find_required_opp(struct device *dev, struct device_node *np);
struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp);
int of_dev_pm_opp_get_cpu_power(unsigned long *mW, unsigned long *KHz, int cpu);
#else
static inline int dev_pm_opp_of_add_table(struct device *dev)
{
@@ -343,6 +344,10 @@ static inline struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
{
return NULL;
}
static inline int of_dev_pm_opp_get_cpu_power(unsigned long *mW, unsigned long *KHz, int cpu)
{
return -ENOTSUPP;
}
#endif
#endif /* __LINUX_OPP_H__ */