Currently interrupt-driven governors (like NVIDIA Tegra30 ACTMON governor)
are used to set polling_ms=0 in order to avoid periodic polling of device
status by devfreq core. This means that polling interval can't be changed
by userspace for such governors.
The new governor flag allows interrupt-driven governors to convey that
devfreq core shouldn't perform polling of device status and thus generic
devfreq polling interval could be supported by these governors now.
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
drivers/devfreq/devfreq.c | 9 +++++++--
drivers/devfreq/governor.h | 3 +++
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index b905963cea7d..a711a76d386e 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -410,7 +410,8 @@ static void devfreq_monitor(struct work_struct *work)
void devfreq_monitor_start(struct devfreq *devfreq)
{
INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor);
- if (devfreq->profile->polling_ms)
+ if (devfreq->profile->polling_ms &&
+ !devfreq->governor->interrupt_driven)
queue_delayed_work(devfreq_wq, &devfreq->work,
msecs_to_jiffies(devfreq->profile->polling_ms));
}
@@ -474,7 +475,8 @@ void devfreq_monitor_resume(struct devfreq *devfreq)
goto out;
if (!delayed_work_pending(&devfreq->work) &&
- devfreq->profile->polling_ms)
+ devfreq->profile->polling_ms &&
+ !devfreq->governor->interrupt_driven)
queue_delayed_work(devfreq_wq, &devfreq->work,
msecs_to_jiffies(devfreq->profile->polling_ms));
@@ -509,6 +511,9 @@ void devfreq_interval_update(struct devfreq *devfreq, unsigned int *delay)
if (devfreq->stop_polling)
goto out;
+ if (devfreq->governor->interrupt_driven)
+ goto out;
+
/* if new delay is zero, stop polling */
if (!new_delay) {
mutex_unlock(&devfreq->lock);
diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h
index bbe5ff9fcecf..dc7533ccc3db 100644
--- a/drivers/devfreq/governor.h
+++ b/drivers/devfreq/governor.h
@@ -31,6 +31,8 @@
* @name: Governor's name
* @immutable: Immutable flag for governor. If the value is 1,
* this govenror is never changeable to other governor.
+ * @interrupt_driven: Devfreq core won't schedule polling work for this
+ * governor if value is set to 1.
* @get_target_freq: Returns desired operating frequency for the device.
* Basically, get_target_freq will run
* devfreq_dev_profile.get_dev_status() to get the
@@ -49,6 +51,7 @@ struct devfreq_governor {
const char name[DEVFREQ_NAME_LEN];
const unsigned int immutable;
+ const unsigned int interrupt_driven;
int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
int (*event_handler)(struct devfreq *devfreq,
unsigned int event, void *data);
--
2.23.0
