linux-kernel - [PACTH v4 1/2] usb: xhci: plat: Enable runtime PM

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Message-Id: <1470757245-7863-2-git-send-email-robert.foss@collabora.com>
Date:	Tue,  9 Aug 2016 11:40:44 -0400
From:	robert.foss@...labora.com
To:	mathias.nyman@...el.com, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Julius Werner <jwerner@...omium.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc:	Robert Foss <robert.foss@...labora.com>
Subject: [PACTH v4 1/2] usb: xhci: plat: Enable runtime PM

From: Robert Foss <robert.foss@...labora.com>

Enable runtime PM for the xhci-plat device so that the parent device
may implement runtime PM.

Signed-off-by: Robert Foss <robert.foss@...labora.com>

Tested-by: Robert Foss <robert.foss@...labora.com>
---
 drivers/usb/host/xhci-plat.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index ed56bf9..2755a20 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -246,6 +246,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
 	if (ret)
 		goto dealloc_usb2_hcd;
 
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
 	return 0;
 
 
@@ -274,6 +277,8 @@ static int xhci_plat_remove(struct platform_device *dev)
 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
 	struct clk *clk = xhci->clk;
 
+	pm_runtime_disable(&dev->dev);
+
 	usb_remove_hcd(xhci->shared_hcd);
 	usb_phy_shutdown(hcd->usb_phy);
 
@@ -292,7 +297,12 @@ static int xhci_plat_suspend(struct device *dev)
 {
 	struct usb_hcd	*hcd = dev_get_drvdata(dev);
 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
+	int ret;
 
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0)
+		atomic_dec(&dev->power.usage_count);
+		return ret;
 	/*
 	 * xhci_suspend() needs `do_wakeup` to know whether host is allowed
 	 * to do wakeup during suspend. Since xhci_plat_suspend is currently
@@ -301,15 +311,27 @@ static int xhci_plat_suspend(struct device *dev)
 	 * reconsider this when xhci_plat_suspend enlarges its scope, e.g.,
 	 * also applies to runtime suspend.
 	 */
-	return xhci_suspend(xhci, device_may_wakeup(dev));
+	ret = xhci_suspend(xhci, device_may_wakeup(dev));
+	pm_runtime_put(dev);
+
+	return ret;
 }
 
 static int xhci_plat_resume(struct device *dev)
 {
 	struct usb_hcd	*hcd = dev_get_drvdata(dev);
 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
+	int ret;
+
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0)
+		atomic_dec(&dev->power.usage_count);
+		return ret;
 
-	return xhci_resume(xhci, 0);
+	ret = xhci_resume(xhci, 0);
+	pm_runtime_put(dev);
+
+	return ret;
 }
 
 static const struct dev_pm_ops xhci_plat_pm_ops = {
-- 
2.7.4