linux-kernel - [PATCH v3 3/7] Kconfig: drivers: devfreq: add default idle polling

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Date:   Tue, 12 Feb 2019 23:23:54 +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 3/7] Kconfig: drivers: devfreq: add default idle polling

This patch adds default idle polling value for devfreq devices.
It is used in idle state, when the device is running at lowest frequency.

Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
---
 drivers/devfreq/Kconfig | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig
index 6a172d3..f0fcc5e 100644
--- a/drivers/devfreq/Kconfig
+++ b/drivers/devfreq/Kconfig
@@ -29,6 +29,19 @@ menuconfig PM_DEVFREQ
 
 if PM_DEVFREQ
 
+config DEVFREQ_DEFAULT_POLLING_IDLE_MS
+	int "Default polling interval in idle state (ms)"
+	default 500
+	help
+	  The devfreq device is being polled by the devfreq framework.
+	  There are two states for the device operation: normal and idle.
+	  Each state has corresponding polling interval.
+	  When a device is not heavily loaded and runs at lowest frequency,
+	  it is in 'idle' state and longer polling interval is used.
+	  This setting controls the idle polling interval.
+	  It is designed to lower for power consumption.
+	  Set this to non-zero if the default value is to big for your system.
+
 comment "DEVFREQ Governors"
 
 config DEVFREQ_GOV_SIMPLE_ONDEMAND
-- 
2.7.4