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cpufreq: dt: No need to allocate resources anymore

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OPP layer manages it now and cpufreq-dt driver doesn't need it. But, we
still need to check for availability of resources for deferred probing.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2016-02-09 10:30:48 +05:30 committed by Rafael J. Wysocki
parent df2c8ec28e
commit dd02a3d920
1 changed files with 47 additions and 69 deletions
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114
drivers/cpufreq/cpufreq-dt.c
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@ -31,7 +31,6 @@
struct private_data {
struct device *cpu_dev;
struct regulator *cpu_reg;
struct thermal_cooling_device *cdev;
const char *reg_name;
};
@ -88,81 +87,66 @@ node_put:
return name;
}
static int allocate_resources(int cpu, struct device **cdev,
struct regulator **creg, struct clk **cclk)
static int resources_available(void)
{
struct device *cpu_dev;
struct regulator *cpu_reg;
struct clk *cpu_clk;
int ret = 0;
char *reg_cpu0 = "cpu0", *reg_cpu = "cpu", *reg;
const char *name;
cpu_dev = get_cpu_device(cpu);
cpu_dev = get_cpu_device(0);
if (!cpu_dev) {
pr_err("failed to get cpu%d device\n", cpu);
pr_err("failed to get cpu0 device\n");
return -ENODEV;
}
/* Try "cpu0" for older DTs */
if (!cpu)
reg = reg_cpu0;
cpu_clk = clk_get(cpu_dev, NULL);
ret = PTR_ERR_OR_ZERO(cpu_clk);
if (ret) {
/*
* If cpu's clk node is present, but clock is not yet
* registered, we should try defering probe.
*/
if (ret == -EPROBE_DEFER)
dev_dbg(cpu_dev, "clock not ready, retry\n");
else
reg = reg_cpu;
dev_err(cpu_dev, "failed to get clock: %d\n", ret);
try_again:
cpu_reg = regulator_get_optional(cpu_dev, reg);
return ret;
}
clk_put(cpu_clk);
name = find_supply_name(cpu_dev);
/* Platform doesn't require regulator */
if (!name)
return 0;
cpu_reg = regulator_get_optional(cpu_dev, name);
ret = PTR_ERR_OR_ZERO(cpu_reg);
if (ret) {
/*
* If cpu's regulator supply node is present, but regulator is
* not yet registered, we should try defering probe.
*/
if (ret == -EPROBE_DEFER) {
dev_dbg(cpu_dev, "cpu%d regulator not ready, retry\n",
cpu);
return ret;
}
/* Try with "cpu-supply" */
if (reg == reg_cpu0) {
reg = reg_cpu;
goto try_again;
}
dev_dbg(cpu_dev, "no regulator for cpu%d: %d\n", cpu, ret);
}
cpu_clk = clk_get(cpu_dev, NULL);
ret = PTR_ERR_OR_ZERO(cpu_clk);
if (ret) {
/* put regulator */
if (!IS_ERR(cpu_reg))
regulator_put(cpu_reg);
/*
* If cpu's clk node is present, but clock is not yet
* registered, we should try defering probe.
*/
if (ret == -EPROBE_DEFER)
dev_dbg(cpu_dev, "cpu%d clock not ready, retry\n", cpu);
dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
else
dev_err(cpu_dev, "failed to get cpu%d clock: %d\n", cpu,
ret);
} else {
*cdev = cpu_dev;
*creg = cpu_reg;
*cclk = cpu_clk;
}
dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);
return ret;
}
regulator_put(cpu_reg);
return 0;
}
static int cpufreq_init(struct cpufreq_policy *policy)
{
struct cpufreq_frequency_table *freq_table;
struct private_data *priv;
struct device *cpu_dev;
struct regulator *cpu_reg;
struct clk *cpu_clk;
struct dev_pm_opp *suspend_opp;
unsigned int transition_latency;
@ -170,9 +154,16 @@ static int cpufreq_init(struct cpufreq_policy *policy)
const char *name;
int ret;
ret = allocate_resources(policy->cpu, &cpu_dev, &cpu_reg, &cpu_clk);
if (ret) {
pr_err("%s: Failed to allocate resources: %d\n", __func__, ret);
cpu_dev = get_cpu_device(policy->cpu);
if (!cpu_dev) {
pr_err("failed to get cpu%d device\n", policy->cpu);
return -ENODEV;
}
cpu_clk = clk_get(cpu_dev, NULL);
if (IS_ERR(cpu_clk)) {
ret = PTR_ERR(cpu_clk);
dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
return ret;
}
@ -186,7 +177,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
if (ret == -ENOENT)
opp_v1 = true;
else
goto out_put_reg_clk;
goto out_put_clk;
}
/*
@ -199,7 +190,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
if (ret) {
dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
policy->cpu, ret);
goto out_put_reg_clk;
goto out_put_clk;
}
}
@ -257,9 +248,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
}
priv->cpu_dev = cpu_dev;
priv->cpu_reg = cpu_reg;
policy->driver_data = priv;
policy->clk = cpu_clk;
rcu_read_lock();
@ -300,10 +289,8 @@ out_free_opp:
dev_pm_opp_of_cpumask_remove_table(policy->cpus);
if (name)
dev_pm_opp_put_regulator(cpu_dev);
out_put_reg_clk:
out_put_clk:
clk_put(cpu_clk);
if (!IS_ERR(cpu_reg))
regulator_put(cpu_reg);
return ret;
}
@ -319,8 +306,6 @@ static int cpufreq_exit(struct cpufreq_policy *policy)
dev_pm_opp_put_regulator(priv->cpu_dev);
clk_put(policy->clk);
if (!IS_ERR(priv->cpu_reg))
regulator_put(priv->cpu_reg);
kfree(priv);
return 0;
@ -373,9 +358,6 @@ static struct cpufreq_driver dt_cpufreq_driver = {
static int dt_cpufreq_probe(struct platform_device *pdev)
{
struct device *cpu_dev;
struct regulator *cpu_reg;
struct clk *cpu_clk;
int ret;
/*
@ -385,19 +367,15 @@ static int dt_cpufreq_probe(struct platform_device *pdev)
*
* FIXME: Is checking this only for CPU0 sufficient ?
*/
ret = allocate_resources(0, &cpu_dev, &cpu_reg, &cpu_clk);
ret = resources_available();
if (ret)
return ret;
clk_put(cpu_clk);
if (!IS_ERR(cpu_reg))
regulator_put(cpu_reg);
dt_cpufreq_driver.driver_data = dev_get_platdata(&pdev->dev);
ret = cpufreq_register_driver(&dt_cpufreq_driver);
if (ret)
dev_err(cpu_dev, "failed register driver: %d\n", ret);
dev_err(&pdev->dev, "failed register driver: %d\n", ret);
return ret;
}