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authorRajagopal Venkat <rajagopal.venkat@linaro.org>2012-10-26 01:50:09 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2012-11-15 00:35:04 +0100
commit7e6fdd4bad033fa2d73716377b184fa975b0d985 (patch)
tree171f13c8aadd833965a9cb0b83a84fe3eb74c1da /drivers/devfreq/governor_simpleondemand.c
parent77b67063bb6bce6d475e910d3b886a606d0d91f7 (diff)
downloadlinux-7e6fdd4bad033fa2d73716377b184fa975b0d985.tar.bz2
PM / devfreq: Core updates to support devices which can idle
Prepare devfreq core framework to support devices which can idle. When device idleness is detected perhaps through runtime-pm, need some mechanism to suspend devfreq load monitoring and resume back when device is online. Present code continues monitoring unless device is removed from devfreq core. This patch introduces following design changes, - use per device work instead of global work to monitor device load. This enables suspend/resume of device devfreq and reduces monitoring code complexity. - decouple delayed work based load monitoring logic from core by introducing helpers functions to be used by governors. This provides flexibility for governors either to use delayed work based monitoring functions or to implement their own mechanism. - devfreq core interacts with governors via events to perform specific actions. These events include start/stop devfreq. This sets ground for adding suspend/resume events. The devfreq apis are not modified and are kept intact. Signed-off-by: Rajagopal Venkat <rajagopal.venkat@linaro.org> Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/devfreq/governor_simpleondemand.c')
-rw-r--r--drivers/devfreq/governor_simpleondemand.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c
index a2e3eae79011..3716a659122b 100644
--- a/drivers/devfreq/governor_simpleondemand.c
+++ b/drivers/devfreq/governor_simpleondemand.c
@@ -12,6 +12,7 @@
#include <linux/errno.h>
#include <linux/devfreq.h>
#include <linux/math64.h>
+#include "governor.h"
/* Default constants for DevFreq-Simple-Ondemand (DFSO) */
#define DFSO_UPTHRESHOLD (90)
@@ -88,7 +89,30 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
return 0;
}
+static int devfreq_simple_ondemand_handler(struct devfreq *devfreq,
+ unsigned int event, void *data)
+{
+ switch (event) {
+ case DEVFREQ_GOV_START:
+ devfreq_monitor_start(devfreq);
+ break;
+
+ case DEVFREQ_GOV_STOP:
+ devfreq_monitor_stop(devfreq);
+ break;
+
+ case DEVFREQ_GOV_INTERVAL:
+ devfreq_interval_update(devfreq, (unsigned int *)data);
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
const struct devfreq_governor devfreq_simple_ondemand = {
.name = "simple_ondemand",
.get_target_freq = devfreq_simple_ondemand_func,
+ .event_handler = devfreq_simple_ondemand_handler,
};