Merge branch 'pm-devfreq'
* pm-devfreq:
PM / devfreq: add relation of recommended frequency.
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index a129a7b..70c31d4 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -83,6 +83,7 @@
{
unsigned long freq;
int err = 0;
+ u32 flags = 0;
if (!mutex_is_locked(&devfreq->lock)) {
WARN(true, "devfreq->lock must be locked by the caller.\n");
@@ -94,7 +95,24 @@
if (err)
return err;
- err = devfreq->profile->target(devfreq->dev.parent, &freq);
+ /*
+ * Adjust the freuqency with user freq and QoS.
+ *
+ * List from the highest proiority
+ * max_freq (probably called by thermal when it's too hot)
+ * min_freq
+ */
+
+ if (devfreq->min_freq && freq < devfreq->min_freq) {
+ freq = devfreq->min_freq;
+ flags &= ~DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use GLB */
+ }
+ if (devfreq->max_freq && freq > devfreq->max_freq) {
+ freq = devfreq->max_freq;
+ flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */
+ }
+
+ err = devfreq->profile->target(devfreq->dev.parent, &freq, flags);
if (err)
return err;
@@ -625,14 +643,30 @@
* freq value given to target callback.
* @dev The devfreq user device. (parent of devfreq)
* @freq The frequency given to target function
+ * @flags Flags handed from devfreq framework.
*
*/
-struct opp *devfreq_recommended_opp(struct device *dev, unsigned long *freq)
+struct opp *devfreq_recommended_opp(struct device *dev, unsigned long *freq,
+ u32 flags)
{
- struct opp *opp = opp_find_freq_ceil(dev, freq);
+ struct opp *opp;
- if (opp == ERR_PTR(-ENODEV))
+ if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) {
+ /* The freq is an upper bound. opp should be lower */
opp = opp_find_freq_floor(dev, freq);
+
+ /* If not available, use the closest opp */
+ if (opp == ERR_PTR(-ENODEV))
+ opp = opp_find_freq_ceil(dev, freq);
+ } else {
+ /* The freq is an lower bound. opp should be higher */
+ opp = opp_find_freq_ceil(dev, freq);
+
+ /* If not available, use the closest opp */
+ if (opp == ERR_PTR(-ENODEV))
+ opp = opp_find_freq_floor(dev, freq);
+ }
+
return opp;
}
diff --git a/drivers/devfreq/exynos4_bus.c b/drivers/devfreq/exynos4_bus.c
index 590d686..1a361e9 100644
--- a/drivers/devfreq/exynos4_bus.c
+++ b/drivers/devfreq/exynos4_bus.c
@@ -619,13 +619,19 @@
return err;
}
-static int exynos4_bus_target(struct device *dev, unsigned long *_freq)
+static int exynos4_bus_target(struct device *dev, unsigned long *_freq,
+ u32 flags)
{
int err = 0;
- struct busfreq_data *data = dev_get_drvdata(dev);
- struct opp *opp = devfreq_recommended_opp(dev, _freq);
- unsigned long old_freq = opp_get_freq(data->curr_opp);
+ struct platform_device *pdev = container_of(dev, struct platform_device,
+ dev);
+ struct busfreq_data *data = platform_get_drvdata(pdev);
+ struct opp *opp = devfreq_recommended_opp(dev, _freq, flags);
unsigned long freq = opp_get_freq(opp);
+ unsigned long old_freq = opp_get_freq(data->curr_opp);
+
+ if (IS_ERR(opp))
+ return PTR_ERR(opp);
if (old_freq == freq)
return 0;
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 5862475..281c72a 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -44,6 +44,14 @@
void *private_data;
};
+/*
+ * The resulting frequency should be at most this. (this bound is the
+ * least upper bound; thus, the resulting freq should be lower or same)
+ * If the flag is not set, the resulting frequency should be at most the
+ * bound (greatest lower bound)
+ */
+#define DEVFREQ_FLAG_LEAST_UPPER_BOUND 0x1
+
/**
* struct devfreq_dev_profile - Devfreq's user device profile
* @initial_freq The operating frequency when devfreq_add_device() is
@@ -54,6 +62,8 @@
* higher than any operable frequency, set maximum.
* Before returning, target function should set
* freq at the current frequency.
+ * The "flags" parameter's possible values are
+ * explained above with "DEVFREQ_FLAG_*" macros.
* @get_dev_status The device should provide the current performance
* status to devfreq, which is used by governors.
* @exit An optional callback that is called when devfreq
@@ -66,7 +76,7 @@
unsigned long initial_freq;
unsigned int polling_ms;
- int (*target)(struct device *dev, unsigned long *freq);
+ int (*target)(struct device *dev, unsigned long *freq, u32 flags);
int (*get_dev_status)(struct device *dev,
struct devfreq_dev_status *stat);
void (*exit)(struct device *dev);
@@ -165,7 +175,7 @@
/* Helper functions for devfreq user device driver with OPP. */
extern struct opp *devfreq_recommended_opp(struct device *dev,
- unsigned long *freq);
+ unsigned long *freq, u32 flags);
extern int devfreq_register_opp_notifier(struct device *dev,
struct devfreq *devfreq);
extern int devfreq_unregister_opp_notifier(struct device *dev,
@@ -216,7 +226,7 @@
}
static struct opp *devfreq_recommended_opp(struct device *dev,
- unsigned long *freq)
+ unsigned long *freq, u32 flags)
{
return -EINVAL;
}