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PM / devfreq: rockchip_dmc: Get policy when need to increase cpu frequency

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Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>
Change-Id: I60d1e7b129b56502d054f041a29438bd37e917ae
This commit is contained in:
Finley Xiao
2022-05-17 10:38:49 +08:00
committed by Tao Huang
parent c12aebd032
commit a2328c4f99
1 changed files with 33 additions and 29 deletions
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62
drivers/devfreq/rockchip_dmc.c
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@@ -397,32 +397,35 @@ static int rockchip_dmcfreq_target(struct device *dev, unsigned long *freq,
* Do this before taking the policy rwsem to avoid deadlocks between the
* mutex that is locked/unlocked in cpu_hotplug_disable/enable. And it
* can also avoid deadlocks between the mutex that is locked/unlocked
* in get/put_online_cpus (such as store_scaling_max_freq()).
* in cpus_read_lock/unlock (such as store_scaling_max_freq()).
*/
get_online_cpus();
cpus_read_lock();
/*
* Go to specified cpufreq and block other cpufreq changes since
* set_rate needs to complete during vblank.
*/
cpu_cur = raw_smp_processor_id();
policy = cpufreq_cpu_get(cpu_cur);
if (!policy) {
dev_err(dev, "cpu%d policy NULL\n", cpu_cur);
goto cpufreq;
}
down_write(&policy->rwsem);
cpufreq_cur = cpufreq_quick_get(cpu_cur);
if (dmcfreq->min_cpu_freq) {
/*
* Go to specified cpufreq and block other cpufreq changes since
* set_rate needs to complete during vblank.
*/
cpu_cur = raw_smp_processor_id();
policy = cpufreq_cpu_acquire(cpu_cur);
if (!policy) {
dev_err(dev, "cpu%d policy NULL\n", cpu_cur);
goto cpufreq;
}
cpufreq_cur = cpufreq_quick_get(cpu_cur);
/* If we're thermally throttled; don't change; */
if (dmcfreq->min_cpu_freq && cpufreq_cur < dmcfreq->min_cpu_freq) {
if (policy->max >= dmcfreq->min_cpu_freq) {
__cpufreq_driver_target(policy, dmcfreq->min_cpu_freq,
CPUFREQ_RELATION_L);
is_cpufreq_changed = true;
} else {
dev_dbg(dev, "CPU may too slow for DMC (%d MHz)\n",
policy->max);
/* If we're thermally throttled; don't change; */
if (cpufreq_cur < dmcfreq->min_cpu_freq) {
if (policy->max >= dmcfreq->min_cpu_freq) {
__cpufreq_driver_target(policy,
dmcfreq->min_cpu_freq,
CPUFREQ_RELATION_L);
is_cpufreq_changed = true;
} else {
dev_dbg(dev,
"CPU may too slow for DMC (%d MHz)\n",
policy->max);
}
}
}
@@ -503,13 +506,14 @@ static int rockchip_dmcfreq_target(struct device *dev, unsigned long *freq,
dmcfreq->volt = target_volt;
out:
if (is_cpufreq_changed)
__cpufreq_driver_target(policy, cpufreq_cur,
CPUFREQ_RELATION_L);
up_write(&policy->rwsem);
cpufreq_cpu_put(policy);
if (dmcfreq->min_cpu_freq) {
if (is_cpufreq_changed)
__cpufreq_driver_target(policy, cpufreq_cur,
CPUFREQ_RELATION_L);
cpufreq_cpu_release(policy);
}
cpufreq:
put_online_cpus();
cpus_read_unlock();
return err;
}