linux-kernel - [PATCH 3/4] PM / devfreq: Kconfig: add DEVFREQ_DELAYED

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Message-Id: <20191209144425.13321-4-k.konieczny@samsung.com>
Date:   Mon,  9 Dec 2019 15:44:24 +0100
From:   Kamil Konieczny <k.konieczny@...sung.com>
To:     k.konieczny@...sung.com
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>
Subject: [PATCH 3/4] PM / devfreq: Kconfig: add DEVFREQ_DELAYED_TIMER option

Add Kconfig option DEVFREQ_DELAYED_TIMER. If set, devfreq workqueue
will use delayed timer from its start.

Signed-off-by: Kamil Konieczny <k.konieczny@...sung.com>
---
 drivers/devfreq/Kconfig | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig
index 38a94df749a2..c799917c34c9 100644
--- a/drivers/devfreq/Kconfig
+++ b/drivers/devfreq/Kconfig
@@ -74,6 +74,18 @@ config DEVFREQ_GOV_PASSIVE
 	  through sysfs entries. The passive governor recommends that
 	  devfreq device uses the OPP table to get the frequency/voltage.
 
+comment "DEVFREQ Options"
+
+config DEVFREQ_DELAYED_TIMER
+	bool "Use delayed timer in Simple Ondemand Governor"
+	default false
+	help
+	  Simple Ondemand Governor uses polling for reading buses counters.
+	  A default timer used is deferred, which saves power, but can
+	  miss increased demand for higher bus frequency if timer was
+	  assigned to idle cpu. If you want to change this to delayed
+	  timer at the cost of more power used, say Yes here.
+
 comment "DEVFREQ Drivers"
 
 config ARM_EXYNOS_BUS_DEVFREQ
-- 
2.24.0