linux-kernel - [PATCH v3 4/7] include: devfreq: add polling_idle

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Date:   Tue, 12 Feb 2019 23:23:55 +0100
From:   Lukasz Luba <l.luba@...tner.samsung.com>
To:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     b.zolnierkie@...sung.com, myungjoo.ham@...sung.com,
        cw00.choi@...sung.com, kyungmin.park@...sung.com,
        m.szyprowski@...sung.com, s.nawrocki@...sung.com, tkjos@...gle.com,
        joel@...lfernandes.org, chris.diamand@....com, mka@...omium.org,
        rostedt@...dmis.org, mingo@...hat.com,
        Lukasz Luba <l.luba@...tner.samsung.com>
Subject: [PATCH v3 4/7] include: devfreq: add polling_idle_ms to 'profile'

Add needed fields to support new state: idle, where different polling
interval is in use. It provides better control of the devfreq device
and lower the power consumption when the device is not busy.

Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
---
 include/linux/devfreq.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index fbffa74..5140970 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -72,6 +72,11 @@ struct devfreq_dev_status {
  * @initial_freq:	The operating frequency when devfreq_add_device() is
  *			called.
  * @polling_ms:		The polling interval in ms. 0 disables polling.
+ * @polling_idle_ms:	The polling interval in 'idle state' in ms.
+ *			When the device is running at lowest frequency and has
+ *			low-load, it is considered as in 'idle state'.
+ *			Thus, longer polling interval is used for the device
+ *			to save some power.
  * @target:		The device should set its operating frequency at
  *			freq or lowest-upper-than-freq value. If freq is
  *			higher than any operable frequency, set maximum.
@@ -98,6 +103,7 @@ struct devfreq_dev_status {
 struct devfreq_dev_profile {
 	unsigned long initial_freq;
 	unsigned int polling_ms;
+	unsigned int polling_idle_ms;
 
 	int (*target)(struct device *dev, unsigned long *freq, u32 flags);
 	int (*get_dev_status)(struct device *dev,
-- 
2.7.4