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.
Signed-off-by: Baolin Wang <baolin.w...@linaro.org>
---
Changes since v1:
- Rebase on Mathias's next branch.
---
drivers/usb/host/xhci-plat.c | 53 ++++++++++++++++++++++++++++++++++++++------
1 file changed, 46 insertions(+), 7 deletions(-)
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 62e71b8..e19b257 100644
--- 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;
}
@@ -318,6 +335,9 @@ static int xhci_plat_remove(struct platform_device *dev)
if (!IS_ERR(clk))
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, 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);
+}
+#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 int xhci_plat_resume(struct device *dev)
.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),
},
--
1.9.1
