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Message-Id: <1478153770-8433-2-git-send-email-hl@rock-chips.com>
Date: Thu, 3 Nov 2016 14:16:09 +0800
From: Lin Huang <hl@...k-chips.com>
To: myungjoo.ham@...sung.com
Cc: cw00.choi@...sung.com, dianders@...omium.org,
linux-rockchip@...ts.infradead.org, linux-pm@...r.kernel.org,
dbasehore@...omium.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, Lin Huang <hl@...k-chips.com>
Subject: [PATCH v2 1/2] PM/devfreq: add suspend frequency support
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).
Change-Id: Iaa0d3848d63d9ce03f65ea76f263e4685a4c295e
Signed-off-by: Lin Huang <hl@...k-chips.com>
---
Changes in v2:
- use update_devfreq() instead devfreq_update_status()
drivers/devfreq/devfreq.c | 17 ++++++++++++++++-
include/linux/devfreq.h | 9 +++++++++
2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index bf3ea76..0a76282 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -364,7 +364,10 @@ void devfreq_monitor_suspend(struct devfreq *devfreq)
return;
}
- devfreq_update_status(devfreq, devfreq->previous_freq);
+ if (devfreq->suspend_freq)
+ update_devfreq(devfreq, devfreq->suspend_freq);
+ else
+ devfreq_update_status(devfreq, devfreq->previous_freq);
devfreq->stop_polling = true;
mutex_unlock(&devfreq->lock);
cancel_delayed_work_sync(&devfreq->work);
@@ -1251,6 +1254,18 @@ 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/include/linux/devfreq.h b/include/linux/devfreq.h
index 2de4e2e..c785ad9 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -88,6 +88,7 @@ struct devfreq_dev_status {
*/
struct devfreq_dev_profile {
unsigned long initial_freq;
+ unsigned long suspend_freq;
unsigned int polling_ms;
int (*target)(struct device *dev, unsigned long *freq, u32 flags);
@@ -172,6 +173,7 @@ 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 +216,8 @@ extern void devm_devfreq_remove_device(struct device *dev,
/* 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,
@@ -348,6 +352,11 @@ 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
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