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Subject[PATCH 2/4] PM / devfreq: Handle monitor suspend/resume in the devfreq core
Date
devfreq expects governors to call devfreq_monitor_suspend/resume()
in response to DEVFREQ_GOV_SUSPEND/RESUME events. Since the devfreq
core itself generates these events and invokes the governor's event
handler the suspend/resume of the load monitoring can be done in the
common code.

Call devfreq_monitor_suspend/resume() when the governor reports a
successful handling of DEVFREQ_GOV_SUSPEND/RESUME and remove these
calls from the simpleondemand and tegra governors. Make
devfreq_monitor_suspend/resume() static since these functions are now
only used by the devfreq core.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
---
drivers/devfreq/devfreq.c | 18 ++++++++----------
drivers/devfreq/governor.h | 2 --
drivers/devfreq/governor_simpleondemand.c | 8 --------
drivers/devfreq/tegra-devfreq.c | 2 --
4 files changed, 8 insertions(+), 22 deletions(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 1d3a43f8b3a10..7fab6c4cf719b 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -447,15 +447,13 @@ EXPORT_SYMBOL(devfreq_monitor_stop);
* devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance
* @devfreq: the devfreq instance.
*
- * Helper function to suspend devfreq device load monitoing. Function
- * to be called from governor in response to DEVFREQ_GOV_SUSPEND
- * event or when polling interval is set to zero.
+ * Helper function to suspend devfreq device load monitoring.
*
* Note: Though this function is same as devfreq_monitor_stop(),
* intentionally kept separate to provide hooks for collecting
* transition statistics.
*/
-void devfreq_monitor_suspend(struct devfreq *devfreq)
+static void devfreq_monitor_suspend(struct devfreq *devfreq)
{
mutex_lock(&devfreq->lock);
if (devfreq->monitor_state != DEVFREQ_MONITOR_RUNNING) {
@@ -468,17 +466,14 @@ void devfreq_monitor_suspend(struct devfreq *devfreq)
mutex_unlock(&devfreq->lock);
cancel_delayed_work_sync(&devfreq->work);
}
-EXPORT_SYMBOL(devfreq_monitor_suspend);

/**
* devfreq_monitor_resume() - Resume load monitoring of a devfreq instance
* @devfreq: the devfreq instance.
*
- * Helper function to resume devfreq device load monitoing. Function
- * to be called from governor in response to DEVFREQ_GOV_RESUME
- * event or when polling interval is set to non-zero.
+ * Helper function to resume devfreq device load monitoring.
*/
-void devfreq_monitor_resume(struct devfreq *devfreq)
+static void devfreq_monitor_resume(struct devfreq *devfreq)
{
unsigned long freq;

@@ -501,7 +496,6 @@ void devfreq_monitor_resume(struct devfreq *devfreq)
out:
mutex_unlock(&devfreq->lock);
}
-EXPORT_SYMBOL(devfreq_monitor_resume);

/**
* devfreq_interval_update() - Update device devfreq monitoring interval
@@ -903,6 +897,8 @@ int devfreq_suspend_device(struct devfreq *devfreq)
DEVFREQ_GOV_SUSPEND, NULL);
if (ret)
return ret;
+
+ devfreq_monitor_suspend(devfreq);
}

if (devfreq->suspend_freq) {
@@ -944,6 +940,8 @@ int devfreq_resume_device(struct devfreq *devfreq)
DEVFREQ_GOV_RESUME, NULL);
if (ret)
return ret;
+
+ devfreq_monitor_resume(devfreq);
}

return 0;
diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h
index f53339ca610fc..d136792c0cc91 100644
--- a/drivers/devfreq/governor.h
+++ b/drivers/devfreq/governor.h
@@ -59,8 +59,6 @@ struct devfreq_governor {

extern void devfreq_monitor_start(struct devfreq *devfreq);
extern void devfreq_monitor_stop(struct devfreq *devfreq);
-extern void devfreq_monitor_suspend(struct devfreq *devfreq);
-extern void devfreq_monitor_resume(struct devfreq *devfreq);
extern void devfreq_interval_update(struct devfreq *devfreq,
unsigned int *delay);

diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c
index c0417f0e081e0..52eb0c734b312 100644
--- a/drivers/devfreq/governor_simpleondemand.c
+++ b/drivers/devfreq/governor_simpleondemand.c
@@ -103,14 +103,6 @@ static int devfreq_simple_ondemand_handler(struct devfreq *devfreq,
devfreq_interval_update(devfreq, (unsigned int *)data);
break;

- case DEVFREQ_GOV_SUSPEND:
- devfreq_monitor_suspend(devfreq);
- break;
-
- case DEVFREQ_GOV_RESUME:
- devfreq_monitor_resume(devfreq);
- break;
-
default:
break;
}
diff --git a/drivers/devfreq/tegra-devfreq.c b/drivers/devfreq/tegra-devfreq.c
index c59d2eee5d309..79efa1e51bd06 100644
--- a/drivers/devfreq/tegra-devfreq.c
+++ b/drivers/devfreq/tegra-devfreq.c
@@ -591,11 +591,9 @@ static int tegra_governor_event_handler(struct devfreq *devfreq,

case DEVFREQ_GOV_SUSPEND:
tegra_actmon_disable_interrupts(tegra);
- devfreq_monitor_suspend(devfreq);
break;

case DEVFREQ_GOV_RESUME:
- devfreq_monitor_resume(devfreq);
tegra_actmon_enable_interrupts(tegra);
break;
}
--
2.20.1.791.gb4d0f1c61a-goog
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