linux-kernel - [PATCH v2 05/10] usb: dwc3: exynos: Enable runtime power management

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Message-id: <1362230590-20960-6-git-send-email-gautam.vivek@samsung.com>
Date:	Sat, 02 Mar 2013 18:53:06 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	linux-usb@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, gregkh@...uxfoundation.org,
	balbi@...com, sarah.a.sharp@...ux.intel.com, kgene.kim@...sung.com,
	kishon@...com
Subject: [PATCH v2 05/10] usb: dwc3: exynos: Enable runtime power management

Enabling runtime power management on dwc3-exynos
letting dwc3 controller to be autosuspended on exynos
platform when not in use.

Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
---
 drivers/usb/dwc3/dwc3-exynos.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
index e6771d9..28b5f8a 100644
--- a/drivers/usb/dwc3/dwc3-exynos.c
+++ b/drivers/usb/dwc3/dwc3-exynos.c
@@ -19,6 +19,7 @@
 #include <linux/platform_data/dwc3-exynos.h>
 #include <linux/dma-mapping.h>
 #include <linux/clk.h>
+#include <linux/pm_runtime.h>
 #include <linux/usb/otg.h>
 #include <linux/usb/nop-usb-xceiv.h>
 #include <linux/of.h>
@@ -143,6 +144,10 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
 	exynos->dev	= dev;
 	exynos->clk	= clk;
 
+	pm_runtime_enable(dev);
+	pm_runtime_get_sync(dev);
+	pm_runtime_forbid(dev);
+
 	clk_enable(exynos->clk);
 
 	ret = platform_device_add_resources(dwc3, pdev->resource,
@@ -158,10 +163,14 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
 		goto err2;
 	}
 
+	pm_runtime_put_sync(dev);
+	pm_runtime_allow(dev);
+
 	return 0;
 
 err2:
 	clk_disable(clk);
+	pm_runtime_disable(dev);
 err1:
 	platform_device_put(dwc3);
 
@@ -172,6 +181,10 @@ static int dwc3_exynos_remove(struct platform_device *pdev)
 {
 	struct dwc3_exynos	*exynos = platform_get_drvdata(pdev);
 
+	if (!pm_runtime_suspended(&pdev->dev))
+		pm_runtime_put(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
 	platform_device_unregister(exynos->dwc3);
 	platform_device_unregister(exynos->usb2_phy);
 	platform_device_unregister(exynos->usb3_phy);
-- 
1.7.6.5

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