linux-kernel - [PATCH 1/3] cpuidle: exynos: Allow to use the driver without AFTR

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Date:	Mon, 21 Jul 2014 10:36:09 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene.kim@...sung.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Sachin Kamat <sachin.kamat@...sung.com>,
	Tushar Behera <tushar.behera@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Cc:	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Tomasz Figa <t.figa@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Subject: [PATCH 1/3] cpuidle: exynos: Allow to use the driver without AFTR

Allow the driver to be used when AFTR enter function is not provided
(device platform data is NULL).

This actually does not give any special energy-saving benefits but
allows to track the idle time of each core. Additionally it is a safe
way to validate supplied platform data.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
---
 drivers/cpuidle/cpuidle-exynos.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/cpuidle/cpuidle-exynos.c b/drivers/cpuidle/cpuidle-exynos.c
index 7c0151263828..5325a394be7e 100644
--- a/drivers/cpuidle/cpuidle-exynos.c
+++ b/drivers/cpuidle/cpuidle-exynos.c
@@ -77,7 +77,10 @@ static int exynos_cpuidle_probe(struct platform_device *pdev)
 {
 	int ret;
 
+	/* If NULL enter only WFI */
 	exynos_enter_aftr = (void *)(pdev->dev.platform_data);
+	if (!exynos_enter_aftr)
+		exynos_idle_driver.state_count = 1;
 
 	ret = cpuidle_register(&exynos_idle_driver, NULL);
 	if (ret) {
-- 
1.9.1

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