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

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Date:   Mon, 28 Nov 2016 14:43:49 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     mathias.nyman@...el.com, balbi@...nel.org
Cc:     gregkh@...uxfoundation.org, broonie@...nel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        baolin.wang@...aro.org
Subject: [PATCH v4 1/2] usb: host: plat: Enable xhci plat runtime PM

Enable the xhci plat runtime PM for parent device to suspend/resume xhci.
Also call pm_runtime_get_noresume() in probe() function in case the parent
device doesn't call suspend/resume callback by runtime PM now.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
Changes since v3:
 - Fix kbuild error.

Changes since v2:
 - Add pm_runtime_get_noresume() in probe() function.
 - Add pm_runtime_set_suspended()/pm_runtime_put_noidle() in remove() function.

Changes since v1:
 - No updates.
---
 drivers/usb/host/xhci-plat.c |   41 ++++++++++++++++++++++++++++++++++++-----
 1 file changed, 36 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index ed56bf9..5805c6a 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -246,6 +246,10 @@ static int xhci_plat_probe(struct platform_device *pdev)
 	if (ret)
 		goto dealloc_usb2_hcd;
 
+	pm_runtime_get_noresume(&pdev->dev);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
 	return 0;
 
 
@@ -274,6 +278,10 @@ static int xhci_plat_remove(struct platform_device *dev)
 	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
 	struct clk *clk = xhci->clk;
 
+	pm_runtime_set_suspended(&dev->dev);
+	pm_runtime_put_noidle(&dev->dev);
+	pm_runtime_disable(&dev->dev);
+
 	usb_remove_hcd(xhci->shared_hcd);
 	usb_phy_shutdown(hcd->usb_phy);
 
@@ -311,14 +319,37 @@ static int xhci_plat_resume(struct device *dev)
 
 	return xhci_resume(xhci, 0);
 }
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM
+static int xhci_plat_runtime_suspend(struct device *dev)
+{
+	struct usb_hcd  *hcd = dev_get_drvdata(dev);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+	return xhci_suspend(xhci, device_may_wakeup(dev));
+}
+
+static int xhci_plat_runtime_resume(struct device *dev)
+{
+	struct usb_hcd  *hcd = dev_get_drvdata(dev);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+	return xhci_resume(xhci, 0);
+}
+
+static int xhci_plat_runtime_idle(struct device *dev)
+{
+	return 0;
+}
+#endif /* CONFIG_PM */
 
 static const struct dev_pm_ops xhci_plat_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
+
+	SET_RUNTIME_PM_OPS(xhci_plat_runtime_suspend, xhci_plat_runtime_resume,
+			   xhci_plat_runtime_idle)
 };
-#define DEV_PM_OPS	(&xhci_plat_pm_ops)
-#else
-#define DEV_PM_OPS	NULL
-#endif /* CONFIG_PM */
 
 static const struct acpi_device_id usb_xhci_acpi_match[] = {
 	/* XHCI-compliant USB Controller */
@@ -332,7 +363,7 @@ static int xhci_plat_resume(struct device *dev)
 	.remove	= xhci_plat_remove,
 	.driver	= {
 		.name = "xhci-hcd",
-		.pm = DEV_PM_OPS,
+		.pm = &xhci_plat_pm_ops,
 		.of_match_table = of_match_ptr(usb_xhci_of_match),
 		.acpi_match_table = ACPI_PTR(usb_xhci_acpi_match),
 	},
-- 
1.7.9.5