In this patch, CPU clock/power domain information is added into the
platform_data of cpufreq-dt so that cpufreq-dt driver could check with CPUs
share clock/power. Also, intermediate frequency support is added in this
version. Since the program flows of .target_index and .target_intermediate
are quite similar, consolidate the flow as a new function to keep readibility.
Signed-off-by: pi-cheng.chen <pi-cheng.chen@xxxxxxxxxx>
---
drivers/cpufreq/cpufreq-dt.c | 68 +++++++++++++++++++++++++++++++++++++++-----
include/linux/cpufreq-dt.h | 7 +++++
2 files changed, 68 insertions(+), 7 deletions(-)
diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index bab67db..5948bdf 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -34,25 +34,37 @@ struct private_data {
struct regulator *cpu_reg;
struct thermal_cooling_device *cdev;
unsigned int voltage_tolerance; /* in percentage */
+ unsigned long intermediate_freq;
};
-static int set_target(struct cpufreq_policy *policy, unsigned int index)
+static unsigned int get_intermediate(struct cpufreq_policy *policy,
+ unsigned int index)
+{
+ struct private_data *priv = policy->driver_data;
+ struct cpufreq_frequency_table *freq_table;
+ unsigned long freq = clk_get_rate(policy->clk);
+
+ freq_table = cpufreq_frequency_get_table(policy->cpu);
+
+ if (freq == priv->intermediate_freq ||
+ freq_table[index].frequency * 1000 == freq)
+ return 0;
+
+ return priv->intermediate_freq;
+}
+
+static int set_frequency(struct cpufreq_policy *policy, long freq_Hz)
{
struct dev_pm_opp *opp;
- struct cpufreq_frequency_table *freq_table = policy->freq_table;
struct clk *cpu_clk = policy->clk;
struct private_data *priv = policy->driver_data;
struct device *cpu_dev = priv->cpu_dev;
struct regulator *cpu_reg = priv->cpu_reg;
unsigned long volt = 0, volt_old = 0, tol = 0;
unsigned int old_freq, new_freq;
- long freq_Hz, freq_exact;
+ long freq_exact;
int ret;
- freq_Hz = clk_round_rate(cpu_clk, freq_table[index].frequency * 1000);
- if (freq_Hz <= 0)
- freq_Hz = freq_table[index].frequency * 1000;
-
freq_exact = freq_Hz;
new_freq = freq_Hz / 1000;
old_freq = clk_get_rate(cpu_clk) / 1000;
@@ -112,6 +124,29 @@ static int set_target(struct cpufreq_policy *policy, unsigned int index)
return ret;
}
+static int target_intermediate(struct cpufreq_policy *policy,
+ unsigned int index)
+{
+ struct private_data *priv = policy->driver_data;
+ long freq_Hz;
+
+ freq_Hz = priv->intermediate_freq;
+ return set_frequency(policy, freq_Hz);
+}
+
+static int set_target(struct cpufreq_policy *policy, unsigned int index)
+{
+ struct cpufreq_frequency_table *freq_table = policy->freq_table;
+ struct clk *cpu_clk = policy->clk;
+ long freq_Hz;
+
+ freq_Hz = clk_round_rate(cpu_clk, freq_table[index].frequency * 1000);
+ if (freq_Hz <= 0)
+ freq_Hz = freq_table[index].frequency * 1000;
+
+ return set_frequency(policy, freq_Hz);
+}
+
static int allocate_resources(int cpu, struct device **cdev,
struct regulator **creg, struct clk **cclk)
{
@@ -296,6 +331,23 @@ static int cpufreq_init(struct cpufreq_policy *policy)
pd = cpufreq_get_driver_data();
if (!pd || !pd->independent_clocks)
cpumask_setall(policy->cpus);
+ else if (pd && !list_empty(&pd->domain_list)) {
+ struct list_head *domain_node;
+ struct cpufreq_cpu_domain *domain;
+
+ list_for_each(domain_node, &pd->domain_list) {
+ domain = container_of(domain_node,
+ struct cpufreq_cpu_domain, node);
+ if (!cpumask_test_cpu(policy->cpu, &domain->cpus))
+ continue;
+
+ if (domain->intermediate_freq)
+ priv->intermediate_freq =
+ domain->intermediate_freq;
+ cpumask_copy(policy->cpus, &domain->cpus);
+ break;
+ }
+ }
of_node_put(np);
@@ -363,6 +415,8 @@ static struct cpufreq_driver dt_cpufreq_driver = {
.verify = cpufreq_generic_frequency_table_verify,
.target_index = set_target,
.get = cpufreq_generic_get,
+ .get_intermediate = get_intermediate,
+ .target_intermediate = target_intermediate,
.init = cpufreq_init,
.exit = cpufreq_exit,
.ready = cpufreq_ready,
diff --git a/include/linux/cpufreq-dt.h b/include/linux/cpufreq-dt.h
index 0414009..d6e2097 100644
--- a/include/linux/cpufreq-dt.h
+++ b/include/linux/cpufreq-dt.h
@@ -10,6 +10,12 @@
#ifndef __CPUFREQ_DT_H__
#define __CPUFREQ_DT_H__
+struct cpufreq_cpu_domain {
+ struct list_head node;
+ cpumask_t cpus;
+ unsigned long intermediate_freq;
+};
+
struct cpufreq_dt_platform_data {
/*
* True when each CPU has its own clock to control its
@@ -17,6 +23,7 @@ struct cpufreq_dt_platform_data {
* clock.
*/
bool independent_clocks;
+ struct list_head domain_list;
};
#endif /* __CPUFREQ_DT_H__ */
--
1.9.1
--
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