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authorMatthias Kaehlcke <mka@chromium.org>2018-08-03 23:05:10 +0300
committerMyungJoo Ham <myungjoo.ham@samsung.com>2018-10-02 04:16:41 +0300
commit6ff66e2a008337b8a005fd0ae2037bed716262cc (patch)
tree41850ac28462aec890606158d4c371f81f19bdbf
parentdf5cf4a36178c5d4f2b8b9469cb2f722e64cd102 (diff)
downloadlinux-6ff66e2a008337b8a005fd0ae2037bed716262cc.tar.xz
PM / devfreq: Don't adjust to user limits in governors
Several governors use the user space limits df->min/max_freq to adjust the target frequency. This is not necessary, since update_devfreq() already takes care of this. Instead the governor can request the available min/max frequency by setting the target frequency to DEVFREQ_MIN/MAX_FREQ and let update_devfreq() take care of any adjustments. Signed-off-by: Matthias Kaehlcke <mka@chromium.org> Reviewed-by: Brian Norris <briannorris@chromium.org> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
-rw-r--r--drivers/devfreq/governor.h3
-rw-r--r--drivers/devfreq/governor_performance.c5
-rw-r--r--drivers/devfreq/governor_powersave.c2
-rw-r--r--drivers/devfreq/governor_simpleondemand.c12
-rw-r--r--drivers/devfreq/governor_userspace.c16
5 files changed, 12 insertions, 26 deletions
diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h
index cfc50a61a90d..b81700244ce3 100644
--- a/drivers/devfreq/governor.h
+++ b/drivers/devfreq/governor.h
@@ -25,6 +25,9 @@
#define DEVFREQ_GOV_SUSPEND 0x4
#define DEVFREQ_GOV_RESUME 0x5
+#define DEVFREQ_MIN_FREQ 0
+#define DEVFREQ_MAX_FREQ ULONG_MAX
+
/**
* struct devfreq_governor - Devfreq policy governor
* @node: list node - contains registered devfreq governors
diff --git a/drivers/devfreq/governor_performance.c b/drivers/devfreq/governor_performance.c
index 4d23ecfbd948..ded429fd51be 100644
--- a/drivers/devfreq/governor_performance.c
+++ b/drivers/devfreq/governor_performance.c
@@ -20,10 +20,7 @@ static int devfreq_performance_func(struct devfreq *df,
* target callback should be able to get floor value as
* said in devfreq.h
*/
- if (!df->max_freq)
- *freq = UINT_MAX;
- else
- *freq = df->max_freq;
+ *freq = DEVFREQ_MAX_FREQ;
return 0;
}
diff --git a/drivers/devfreq/governor_powersave.c b/drivers/devfreq/governor_powersave.c
index 0c42f23249ef..9e8897f5ac42 100644
--- a/drivers/devfreq/governor_powersave.c
+++ b/drivers/devfreq/governor_powersave.c
@@ -20,7 +20,7 @@ static int devfreq_powersave_func(struct devfreq *df,
* target callback should be able to get ceiling value as
* said in devfreq.h
*/
- *freq = df->min_freq;
+ *freq = DEVFREQ_MIN_FREQ;
return 0;
}
diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c
index 28e0f2de7100..c0417f0e081e 100644
--- a/drivers/devfreq/governor_simpleondemand.c
+++ b/drivers/devfreq/governor_simpleondemand.c
@@ -27,7 +27,6 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
unsigned int dfso_upthreshold = DFSO_UPTHRESHOLD;
unsigned int dfso_downdifferential = DFSO_DOWNDIFFERENCTIAL;
struct devfreq_simple_ondemand_data *data = df->data;
- unsigned long max = (df->max_freq) ? df->max_freq : UINT_MAX;
err = devfreq_update_stats(df);
if (err)
@@ -47,7 +46,7 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
/* Assume MAX if it is going to be divided by zero */
if (stat->total_time == 0) {
- *freq = max;
+ *freq = DEVFREQ_MAX_FREQ;
return 0;
}
@@ -60,13 +59,13 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
/* Set MAX if it's busy enough */
if (stat->busy_time * 100 >
stat->total_time * dfso_upthreshold) {
- *freq = max;
+ *freq = DEVFREQ_MAX_FREQ;
return 0;
}
/* Set MAX if we do not know the initial frequency */
if (stat->current_frequency == 0) {
- *freq = max;
+ *freq = DEVFREQ_MAX_FREQ;
return 0;
}
@@ -85,11 +84,6 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
b = div_u64(b, (dfso_upthreshold - dfso_downdifferential / 2));
*freq = (unsigned long) b;
- if (df->min_freq && *freq < df->min_freq)
- *freq = df->min_freq;
- if (df->max_freq && *freq > df->max_freq)
- *freq = df->max_freq;
-
return 0;
}
diff --git a/drivers/devfreq/governor_userspace.c b/drivers/devfreq/governor_userspace.c
index 080607c3f34d..378d84c011df 100644
--- a/drivers/devfreq/governor_userspace.c
+++ b/drivers/devfreq/governor_userspace.c
@@ -26,19 +26,11 @@ static int devfreq_userspace_func(struct devfreq *df, unsigned long *freq)
{
struct userspace_data *data = df->data;
- if (data->valid) {
- unsigned long adjusted_freq = data->user_frequency;
-
- if (df->max_freq && adjusted_freq > df->max_freq)
- adjusted_freq = df->max_freq;
-
- if (df->min_freq && adjusted_freq < df->min_freq)
- adjusted_freq = df->min_freq;
-
- *freq = adjusted_freq;
- } else {
+ if (data->valid)
+ *freq = data->user_frequency;
+ else
*freq = df->previous_freq; /* No user freq specified yet */
- }
+
return 0;
}