linux-kernel - [PATCH 1/4] usb: xhci: Enable runtime pm in xhci-plat

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Date:	Mon, 28 Jan 2013 17:12:25 +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,
	dianders@...omium.org, sylvester.nawrocki@...il.com,
	tomasz.figa@...il.com
Subject: [PATCH 1/4] usb: xhci: Enable runtime pm in xhci-plat

By enabling runtime pm in this driver is allows users of xhci-plat to
enter into runtime pm.  This is not full runtime pm support (AKA
xhci-plat doesn't actually power anything off when in runtime suspend
mode) but just basic enablement.

Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
Signed-off-by: Doug Anderson <dianders@...omium.org>
---
 drivers/usb/host/xhci-plat.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index df90fe5..6ad7cfb 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -139,6 +139,10 @@ static int xhci_plat_probe(struct platform_device *pdev)
 		goto dealloc_usb2_hcd;
 	}
 
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_forbid(&pdev->dev);
+
 	/*
 	 * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)
 	 * is called by usb_add_hcd().
@@ -149,10 +153,13 @@ static int xhci_plat_probe(struct platform_device *pdev)
 	if (ret)
 		goto put_usb3_hcd;
 
+	pm_runtime_allow(&pdev->dev);
+
 	return 0;
 
 put_usb3_hcd:
 	usb_put_hcd(xhci->shared_hcd);
+	pm_runtime_disable(&pdev->dev);
 
 dealloc_usb2_hcd:
 	usb_remove_hcd(hcd);
@@ -174,6 +181,8 @@ static int xhci_plat_remove(struct platform_device *dev)
 	struct usb_hcd	*hcd = platform_get_drvdata(dev);
 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
 
+	pm_runtime_disable(&dev->dev);
+
 	usb_remove_hcd(xhci->shared_hcd);
 	usb_put_hcd(xhci->shared_hcd);
 
-- 
1.7.6.5

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