We need ddr run a specific frequency when ddr dvfs stop working. So we
implement get suspend frequency function in devfreq framework, and call
it in rk3399 dmc driver.
Lin Huang (2):
PM/devfreq: add suspend frequency support
PM/devfreq: rk3399: get devfreq suspend frequency
drivers/devfreq/devfreq.c | 18 ++++++++++++++++--
drivers/devfreq/governor_simpleondemand.c | 9 +++++++++
drivers/devfreq/rk3399_dmc.c | 2 +-
include/linux/devfreq.h | 8 ++++++++
4 files changed, 34 insertions(+), 3 deletions(-)
--
1.9.1
Add suspend frequency support and if needed set it to
the frequency obtained from the suspend opp (can be defined
using opp-v2 bindings and is optional).
Signed-off-by: Lin Huang <[email protected]>
---
Changes in v2:
- use update_devfreq() instead devfreq_update_status()
Changes in v3:
- fix build error
drivers/devfreq/devfreq.c | 18 ++++++++++++++++--
drivers/devfreq/governor_simpleondemand.c | 9 +++++++++
include/linux/devfreq.h | 8 ++++++++
3 files changed, 33 insertions(+), 2 deletions(-)
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index da72d97..4c76e79 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -359,8 +359,10 @@ void devfreq_monitor_suspend(struct devfreq *devfreq)
mutex_unlock(&devfreq->lock);
return;
}
-
- devfreq_update_status(devfreq, devfreq->previous_freq);
+ if (devfreq->suspend_freq)
+ update_devfreq(devfreq);
+ else
+ devfreq_update_status(devfreq, devfreq->previous_freq);
devfreq->stop_polling = true;
mutex_unlock(&devfreq->lock);
cancel_delayed_work_sync(&devfreq->work);
@@ -1254,6 +1256,18 @@ struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
}
EXPORT_SYMBOL(devfreq_recommended_opp);
+void devfreq_opp_get_suspend_opp(struct device *dev, struct devfreq *devfreq)
+{
+ struct dev_pm_opp *suspend_opp;
+
+ rcu_read_lock();
+ suspend_opp = dev_pm_opp_get_suspend_opp(dev);
+ if (suspend_opp)
+ devfreq->suspend_freq = dev_pm_opp_get_freq(suspend_opp);
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL(devfreq_opp_get_suspend_opp);
+
/**
* devfreq_register_opp_notifier() - Helper function to get devfreq notified
* for any changes in the OPP availability
diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c
index ae72ba5..a3efee0 100644
--- a/drivers/devfreq/governor_simpleondemand.c
+++ b/drivers/devfreq/governor_simpleondemand.c
@@ -29,6 +29,15 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
struct devfreq_simple_ondemand_data *data = df->data;
unsigned long max = (df->max_freq) ? df->max_freq : UINT_MAX;
+ /*
+ * if devfreq in suspend status and have suspend_freq,
+ * the frequency need to set to suspend_freq
+ */
+ if (df->stop_polling && df->suspend_freq) {
+ *freq = df->suspend_freq;
+ return 0;
+ }
+
err = devfreq_update_stats(df);
if (err)
return err;
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 98c6993..1bdd5d3 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -172,6 +172,7 @@ struct devfreq {
struct delayed_work work;
unsigned long previous_freq;
+ unsigned long suspend_freq;
struct devfreq_dev_status last_status;
void *data; /* private data for governors */
@@ -214,6 +215,8 @@ extern int devfreq_resume_device(struct devfreq *devfreq);
/* Helper functions for devfreq user device driver with OPP. */
extern struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
unsigned long *freq, u32 flags);
+extern void devfreq_opp_get_suspend_opp(struct device *dev,
+ struct devfreq *devfreq);
extern int devfreq_register_opp_notifier(struct device *dev,
struct devfreq *devfreq);
extern int devfreq_unregister_opp_notifier(struct device *dev,
@@ -315,6 +318,11 @@ static inline struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
return ERR_PTR(-EINVAL);
}
+static inline void devfreq_opp_get_suspend_opp(struct device *dev,
+ struct devfreq *devfreq)
+{
+}
+
static inline int devfreq_register_opp_notifier(struct device *dev,
struct devfreq *devfreq)
{
--
1.9.1
We need ddr run a specific frequency when ddr dvfs stop
working. For example: if we enable two monitor, then we will
stop ddr dvfs, but we hope ddr can run in highest frequency
obviously.
Signed-off-by: Lin Huang <[email protected]>
---
Changes in v2:
- None
Changes in v3:
- None
drivers/devfreq/rk3399_dmc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index 5a2da95..39f8e27 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -329,7 +329,7 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
if (IS_ERR(data->devfreq))
return PTR_ERR(data->devfreq);
devm_devfreq_register_opp_notifier(dev, data->devfreq);
-
+ devfreq_opp_get_suspend_opp(dev, data->devfreq);
data->dev = dev;
platform_set_drvdata(pdev, data);
pd_register_notify_to_dmc(data->devfreq);
--
1.9.1