linux-kernel - [PATCH 1/1] ARM: EXYNOS: Call regulator core suspend prepare and finish functions

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Message-Id: <1413374496-27866-1-git-send-email-javier.martinez@collabora.co.uk>
Date:	Wed, 15 Oct 2014 14:01:36 +0200
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Kukjin Kim <kgene.kim@...sung.com>
Cc:	Doug Anderson <dianders@...omium.org>,
	Mark Brown <broonie@...nel.org>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Subject: [PATCH 1/1] ARM: EXYNOS: Call regulator core suspend prepare and finish functions

The regulator framework has a set of helpers functions to be used when
the system is entering and leaving from suspend but these are not called
on Exynos platforms. This means that the .set_suspend_* function handlers
defined in regulator drivers are never called when the system is suspended.

Suggested-by: Doug Anderson <dianders@...omium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
---
 arch/arm/mach-exynos/suspend.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm/mach-exynos/suspend.c b/arch/arm/mach-exynos/suspend.c
index f5d9773..5b9c551 100644
--- a/arch/arm/mach-exynos/suspend.c
+++ b/arch/arm/mach-exynos/suspend.c
@@ -20,6 +20,7 @@
 #include <linux/io.h>
 #include <linux/irqchip/arm-gic.h>
 #include <linux/err.h>
+#include <linux/regulator/machine.h>
 
 #include <asm/cacheflush.h>
 #include <asm/hardware/cache-l2x0.h>
@@ -270,14 +271,29 @@ static int exynos_suspend_enter(suspend_state_t state)
 
 static int exynos_suspend_prepare(void)
 {
+	int ret;
+
 	s3c_pm_check_prepare();
 
+	/*
+	 * REVISIT: It would be better if struct platform_suspend_ops
+	 * .prepare handler get the suspend_state_t as a parameter to
+	 * avoid hard-coding the suspend to mem state. It's safe to do
+	 * it only because the suspend_valid_only_mem function is the
+	 * .valid callback used to check if a given state is supported
+	 * by the platform.
+	 */
+	ret = regulator_suspend_prepare(PM_SUSPEND_MEM);
+	if (ret)
+		pr_info("Failed to prepare regulators for system suspend\n");
+
 	return 0;
 }
 
 static void exynos_suspend_finish(void)
 {
 	s3c_pm_check_cleanup();
+	regulator_suspend_finish();
 }
 
 static const struct platform_suspend_ops exynos_suspend_ops = {
-- 
2.1.0

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