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_forbid() in probe() function to force users
to explicitly enable runtime pm using power/control in sysfs, in case
some parent devices didn't implement runtime PM callbacks.

[set do_wakeup to true when runtime suspending -Mathias]
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 62e71b8a8b5553f592f6759d5461daf2fd1cfb56..60aeaca5b1dcea2f505ec410558a704f2f6dd45e 100644 (file)
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -197,10 +197,16 @@ static int xhci_plat_probe(struct platform_device *pdev)
                        return ret;
        }
 
+       pm_runtime_set_active(&pdev->dev);
+       pm_runtime_enable(&pdev->dev);
+       pm_runtime_get_noresume(&pdev->dev);
+
        hcd = __usb_create_hcd(driver, sysdev, &pdev->dev,
                               dev_name(&pdev->dev), NULL);
-       if (!hcd)
-               return -ENOMEM;
+       if (!hcd) {
+               ret = -ENOMEM;
+               goto disable_runtime;
+       }
 
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        hcd->regs = devm_ioremap_resource(&pdev->dev, res);
@@ -278,6 +284,13 @@ static int xhci_plat_probe(struct platform_device *pdev)
                goto dealloc_usb2_hcd;
 
        device_enable_async_suspend(&pdev->dev);
+       pm_runtime_put_noidle(&pdev->dev);
+
+       /*
+        * Prevent runtime pm from being on as default, users should enable
+        * runtime pm using power/control in sysfs.
+        */
+       pm_runtime_forbid(&pdev->dev);
 
        return 0;
 
@@ -298,6 +311,10 @@ static int xhci_plat_probe(struct platform_device *pdev)
 put_hcd:
        usb_put_hcd(hcd);
 
+disable_runtime:
+       pm_runtime_put_noidle(&pdev->dev);
+       pm_runtime_disable(&pdev->dev);
+
        return ret;
 }
 
@@ -319,6 +336,9 @@ static int xhci_plat_remove(struct platform_device *dev)
                clk_disable_unprepare(clk);
        usb_put_hcd(hcd);
 
+       pm_runtime_set_suspended(&dev->dev);
+       pm_runtime_disable(&dev->dev);
+
        return 0;
 }
 
@@ -346,14 +366,33 @@ 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, true);
+}
+
+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);
+}
+#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,
+                          NULL)
 };
-#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 */
@@ -368,7 +407,7 @@ static struct platform_driver usb_xhci_driver = {
        .shutdown       = usb_hcd_platform_shutdown,
        .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),
        },