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cpufreq: powerpc: macintosh: Switch to QoS requests for freq limits

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The cpufreq core now takes the min/max frequency constraints via QoS
requests and the CPUFREQ_ADJUST notifier shall get removed later on.

Switch over to using the QoS request for maximum frequency constraint
for windfarm_cpufreq_clamp driver.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2019-07-23 11:44:03 +05:30 committed by Rafael J. Wysocki
parent 5130802ddb
commit dce2e3a841
1 changed files with 50 additions and 27 deletions
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77
drivers/macintosh/windfarm_cpufreq_clamp.c
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@ -3,9 +3,11 @@
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/pm_qos.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <asm/prom.h>
@ -16,36 +18,24 @@
static int clamped;
static struct wf_control *clamp_control;
static int clamp_notifier_call(struct notifier_block *self,
unsigned long event, void *data)
{
struct cpufreq_policy *p = data;
unsigned long max_freq;
if (event != CPUFREQ_ADJUST)
return 0;
max_freq = clamped ? (p->cpuinfo.min_freq) : (p->cpuinfo.max_freq);
cpufreq_verify_within_limits(p, 0, max_freq);
return 0;
}
static struct notifier_block clamp_notifier = {
.notifier_call = clamp_notifier_call,
};
static struct dev_pm_qos_request qos_req;
static unsigned int min_freq, max_freq;
static int clamp_set(struct wf_control *ct, s32 value)
{
if (value)
unsigned int freq;
if (value) {
freq = min_freq;
printk(KERN_INFO "windfarm: Clamping CPU frequency to "
"minimum !\n");
else
} else {
freq = max_freq;
printk(KERN_INFO "windfarm: CPU frequency unclamped !\n");
}
clamped = value;
cpufreq_update_policy(0);
return 0;
return dev_pm_qos_update_request(&qos_req, freq);
}
static int clamp_get(struct wf_control *ct, s32 *value)
@ -74,27 +64,60 @@ static const struct wf_control_ops clamp_ops = {
static int __init wf_cpufreq_clamp_init(void)
{
struct cpufreq_policy *policy;
struct wf_control *clamp;
struct device *dev;
int ret;
policy = cpufreq_cpu_get(0);
if (!policy) {
pr_warn("%s: cpufreq policy not found cpu0\n", __func__);
return -EPROBE_DEFER;
}
min_freq = policy->cpuinfo.min_freq;
max_freq = policy->cpuinfo.max_freq;
cpufreq_cpu_put(policy);
dev = get_cpu_device(0);
if (unlikely(!dev)) {
pr_warn("%s: No cpu device for cpu0\n", __func__);
return -ENODEV;
}
clamp = kmalloc(sizeof(struct wf_control), GFP_KERNEL);
if (clamp == NULL)
return -ENOMEM;
cpufreq_register_notifier(&clamp_notifier, CPUFREQ_POLICY_NOTIFIER);
ret = dev_pm_qos_add_request(dev, &qos_req, DEV_PM_QOS_MAX_FREQUENCY,
max_freq);
if (ret < 0) {
pr_err("%s: Failed to add freq constraint (%d)\n", __func__,
ret);
goto free;
}
clamp->ops = &clamp_ops;
clamp->name = "cpufreq-clamp";
if (wf_register_control(clamp))
ret = wf_register_control(clamp);
if (ret)
goto fail;
clamp_control = clamp;
return 0;
fail:
dev_pm_qos_remove_request(&qos_req);
free:
kfree(clamp);
return -ENODEV;
return ret;
}
static void __exit wf_cpufreq_clamp_exit(void)
{
if (clamp_control)
if (clamp_control) {
wf_unregister_control(clamp_control);
dev_pm_qos_remove_request(&qos_req);
}
}