linux-kernel - [PATCH v7 1/2] usb: xhci: plat: Enable runtime PM

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Date:   Thu,  1 Dec 2016 16:46:03 -0500
From:   Robert Foss <robert.foss@...labora.com>
To:     robert.foss@...labora.com, mathias.nyman@...el.com,
        gregkh@...uxfoundation.org, Julius Werner <jwerner@...omium.org>,
        Andrew Bresticker <abrestic@...omium.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Brian Norris <briannorris@...omium.org>,
        Baolin Wang <baolin.wang@...aro.org>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH v7 1/2] usb: xhci: plat: Enable runtime PM

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 | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index ed56bf9ed885..ba4efe74f537 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);
 
@@ -292,6 +297,13 @@ 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) {
+		pm_runtime_put(dev);
+		return ret;
+	}
 
 	/*
 	 * xhci_suspend() needs `do_wakeup` to know whether host is allowed
@@ -301,15 +313,28 @@ 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;
 
-	return xhci_resume(xhci, 0);
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0) {
+		pm_runtime_put(dev);
+		return ret;
+	}
+
+	ret = xhci_resume(xhci, 0);
+	pm_runtime_put(dev);
+
+	return ret;
 }
 
 static const struct dev_pm_ops xhci_plat_pm_ops = {
-- 
2.11.0