thermal: cpu_cooling: Update always cpufreq policy with thermal constraints

Existing code updates cupfreq policy only while executing
cpufreq_apply_cooling() function (i.e. when notify_device != NOTIFY_INVALID).
It doesn't apply constraints when cpufreq policy update happens from any other
place but it should update the cpufreq policy with thermal constraints every
time when there is a cpufreq policy update, to keep state of
cpufreq_cooling_device and max_feq of cpufreq policy in sync. For instance
while resuming cpufreq updates cpufreq_policy and it restores default
policy->usr_policy values irrespective of cooling device's cpufreq_state since
notification gets missed because (notify_device == NOTIFY_INVALID).
Another problem, is that userspace is able to change max_freq irrespective of
cooling device's state, as notification gets missed.

This patch modifies code to maintain a global cpufreq_dev_list and applies
constraints of all matching cooling devices for policy's cpu when there is any
policy update(ends up applying the lowest max_freq among the matching cpu
cooling devices).

This patch also removes redundant check (max_freq > policy->user_policy.max),
as cpufreq framework takes care of user_policy constraints already where ever
required, otherwise its causing an issue while increasing max_freq in normal
scenerio as it restores max_freq with policy->user_policy.max which is old
(smaller) value.

Signed-off-by: Yadwinder Singh Brar <yadi.brar@samsung.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

1 files changed, 21 insertions, 16 deletions

diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index 1ab0018271c5..ad09e51ffae4 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -50,15 +50,14 @@ struct cpufreq_cooling_device {
         unsigned int cpufreq_state;
         unsigned int cpufreq_val;
         struct cpumask allowed_cpus;
+        struct list_head node;
 };
 static DEFINE_IDR(cpufreq_idr);
 static DEFINE_MUTEX(cooling_cpufreq_lock);
 
 static unsigned int cpufreq_dev_count;
 
-/* notify_table passes value to the CPUFREQ_ADJUST callback function. */
-#define NOTIFY_INVALID NULL
-static struct cpufreq_cooling_device *notify_device;
+static LIST_HEAD(cpufreq_dev_list);
 
 /**
  * get_idr - function to get a unique id.
@@ -287,15 +286,12 @@ static int cpufreq_apply_cooling(struct cpufreq_cooling_device *cpufreq_device,
 
         cpufreq_device->cpufreq_state = cooling_state;
         cpufreq_device->cpufreq_val = clip_freq;
-        notify_device = cpufreq_device;
 
         for_each_cpu(cpuid, mask) {
                 if (is_cpufreq_valid(cpuid))
                         cpufreq_update_policy(cpuid);
         }
 
-        notify_device = NOTIFY_INVALID;
-
         return 0;
 }
 
@@ -316,21 +312,28 @@ static int cpufreq_thermal_notifier(struct notifier_block *nb,
 {
         struct cpufreq_policy *policy = data;
         unsigned long max_freq = 0;
+        struct cpufreq_cooling_device *cpufreq_dev;
 
-        if (event != CPUFREQ_ADJUST || notify_device == NOTIFY_INVALID)
+        if (event != CPUFREQ_ADJUST)
                 return 0;
 
-        if (cpumask_test_cpu(policy->cpu, &notify_device->allowed_cpus))
-                max_freq = notify_device->cpufreq_val;
-        else
-                return 0;
+        mutex_lock(&cooling_cpufreq_lock);
+        list_for_each_entry(cpufreq_dev, &cpufreq_dev_list, node) {
+                if (!cpumask_test_cpu(policy->cpu,
+                                        &cpufreq_dev->allowed_cpus))
+                        continue;
+
+                if (!cpufreq_dev->cpufreq_val)
+                        cpufreq_dev->cpufreq_val = get_cpu_frequency(
+                                        cpumask_any(&cpufreq_dev->allowed_cpus),
+                                        cpufreq_dev->cpufreq_state);
 
-        /* Never exceed user_policy.max */
-        if (max_freq > policy->user_policy.max)
-                max_freq = policy->user_policy.max;
+                max_freq = cpufreq_dev->cpufreq_val;
 
-        if (policy->max != max_freq)
-                cpufreq_verify_within_limits(policy, 0, max_freq);
+                if (policy->max != max_freq)
+                        cpufreq_verify_within_limits(policy, 0, max_freq);
+        }
+        mutex_unlock(&cooling_cpufreq_lock);
 
         return 0;
 }
@@ -486,6 +489,7 @@ __cpufreq_cooling_register(struct device_node *np,
                 cpufreq_register_notifier(&thermal_cpufreq_notifier_block,
                                           CPUFREQ_POLICY_NOTIFIER);
         cpufreq_dev_count++;
+        list_add(&cpufreq_dev->node, &cpufreq_dev_list);
 
         mutex_unlock(&cooling_cpufreq_lock);
 
@@ -549,6 +553,7 @@ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
 
         cpufreq_dev = cdev->devdata;
         mutex_lock(&cooling_cpufreq_lock);
+        list_del(&cpufreq_dev->node);
         cpufreq_dev_count--;
 
         /* Unregister the notifier for the last cpufreq cooling device */