Hi Dmitry,
Sorry for the additional comment of this patch.
I think that you better to change the 'interrupt_driven' checking
style as following in order to keep the consistency of governor
flag checking style.
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 27de8ddeaaa8..fe409fc1bcc4 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -410,9 +410,11 @@ static void devfreq_monitor(struct work_struct *work)
*/
void devfreq_monitor_start(struct devfreq *devfreq)
{
+ if (devfreq->governor->interrupt_driven)
+ return;
+
INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor);
if (devfreq->profile->polling_ms &&
- !devfreq->governor->interrupt_driven)
queue_delayed_work(devfreq_wq, &devfreq->work,
msecs_to_jiffies(devfreq->profile->polling_ms));
}
@@ -475,12 +477,15 @@ void devfreq_monitor_resume(struct devfreq *devfreq)
if (!devfreq->stop_polling)
goto out;
+ if (devfreq->governor->interrupt_driven)
+ goto out_update;
+
if (!delayed_work_pending(&devfreq->work) &&
devfreq->profile->polling_ms &&
- !devfreq->governor->interrupt_driven)
queue_delayed_work(devfreq_wq, &devfreq->work,
msecs_to_jiffies(devfreq->profile->polling_ms));
+out_update:
devfreq->last_stat_updated = jiffies;
devfreq->stop_polling = false;
If you edit it as following, feel free to add my reviewed-by tag:
Reviewed-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
On 19. 11. 4. 오전 5:41, Dmitry Osipenko wrote:
> 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);
>
--
Best Regards,
Chanwoo Choi
Samsung Electronics
