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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 * Do this before taking the policy rwsem to avoid deadlocks between the
* mutex that is locked/unlocked in cpu_hotplug_disable/enable. And it * mutex that is locked/unlocked in cpu_hotplug_disable/enable. And it
* can also avoid deadlocks between the mutex that is locked/unlocked * 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();
/* if (dmcfreq->min_cpu_freq) {
* Go to specified cpufreq and block other cpufreq changes since /*
* set_rate needs to complete during vblank. * 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); cpu_cur = raw_smp_processor_id();
if (!policy) { policy = cpufreq_cpu_acquire(cpu_cur);
dev_err(dev, "cpu%d policy NULL\n", cpu_cur); if (!policy) {
goto cpufreq; dev_err(dev, "cpu%d policy NULL\n", cpu_cur);
} goto cpufreq;
down_write(&policy->rwsem); }
cpufreq_cur = cpufreq_quick_get(cpu_cur); cpufreq_cur = cpufreq_quick_get(cpu_cur);
/* If we're thermally throttled; don't change; */ /* If we're thermally throttled; don't change; */
if (dmcfreq->min_cpu_freq && cpufreq_cur < dmcfreq->min_cpu_freq) { if (cpufreq_cur < dmcfreq->min_cpu_freq) {
if (policy->max >= dmcfreq->min_cpu_freq) { if (policy->max >= dmcfreq->min_cpu_freq) {
__cpufreq_driver_target(policy, dmcfreq->min_cpu_freq, __cpufreq_driver_target(policy,
CPUFREQ_RELATION_L); dmcfreq->min_cpu_freq,
is_cpufreq_changed = true; CPUFREQ_RELATION_L);
} else { is_cpufreq_changed = true;
dev_dbg(dev, "CPU may too slow for DMC (%d MHz)\n", } else {
policy->max); 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; dmcfreq->volt = target_volt;
out: out:
if (is_cpufreq_changed) if (dmcfreq->min_cpu_freq) {
__cpufreq_driver_target(policy, cpufreq_cur, if (is_cpufreq_changed)
CPUFREQ_RELATION_L); __cpufreq_driver_target(policy, cpufreq_cur,
up_write(&policy->rwsem); CPUFREQ_RELATION_L);
cpufreq_cpu_put(policy); cpufreq_cpu_release(policy);
}
cpufreq: cpufreq:
put_online_cpus(); cpus_read_unlock();
return err; return err;
} }