Adds power management support to XHCI platform driver.
This patch facilitates the transition of xHCI host controller
between S0 and S3/S4 power states, during suspend/resume cycles.
Signed-off-by: Abhilash Kesavan <a.kesa...@samsung.com>
Signed-off-by: Vikas C Sajjan <vikas.saj...@linaro.org>
CC: Doug Anderson <diand...@chromium.org>
---
drivers/usb/host/xhci-plat.c | 28 ++++++++++++++++++++++++++++
1 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index df90fe5..eaf3a07 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -185,11 +185,39 @@ static int xhci_plat_remove(struct platform_device *dev)
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int xhci_plat_suspend(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+ /* Make sure that the HCD Core has set state to HC_STATE_SUSPENDED */
+ if (hcd->state != HC_STATE_SUSPENDED ||
+ xhci->shared_hcd->state != HC_STATE_SUSPENDED)
+ return -EINVAL;
+
+ return xhci_suspend(xhci);
+}
+
+static int xhci_plat_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_SLEEP */
+
+static const struct dev_pm_ops xhci_plat_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
+};
+
static struct platform_driver usb_xhci_driver = {
.probe = xhci_plat_probe,
.remove = xhci_plat_remove,
.driver = {
.name = "xhci-hcd",
+ .pm = &xhci_plat_pm_ops,
},
};
MODULE_ALIAS("platform:xhci-hcd");
--
1.7.6.5
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