USB: EHCI: msm: Add support for power management
Enable runtime PM and mark no_callbacks flag. OTG device, parent of
HCD takes care of putting hardware into low power mode. Adjust port
power wakeup flags during system suspend and resume.
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c
index 9ed8559..413f4de 100644
--- a/drivers/usb/host/ehci-msm.c
+++ b/drivers/usb/host/ehci-msm.c
@@ -25,6 +25,7 @@
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/err.h>
+#include <linux/pm_runtime.h>
#include <linux/usb/otg.h>
#include <linux/usb/msm_hsusb_hw.h>
@@ -239,7 +240,8 @@
/*
* OTG driver takes care of PHY initialization, clock management,
- * powering up VBUS and mapping of registers address space.
+ * powering up VBUS, mapping of registers address space and power
+ * management.
*/
otg = otg_get_transceiver();
if (!otg) {
@@ -255,6 +257,13 @@
}
device_init_wakeup(&pdev->dev, 1);
+ /*
+ * OTG device parent of HCD takes care of putting
+ * hardware into low power mode.
+ */
+ pm_runtime_no_callbacks(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
return 0;
put_transceiver:
@@ -272,6 +281,8 @@
struct usb_hcd *hcd = platform_get_drvdata(pdev);
device_init_wakeup(&pdev->dev, 0);
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_set_suspended(&pdev->dev);
otg_set_host(otg, NULL);
otg_put_transceiver(otg);
@@ -281,10 +292,54 @@
return 0;
}
+#ifdef CONFIG_PM
+static int ehci_msm_pm_suspend(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ bool wakeup = device_may_wakeup(dev);
+
+ dev_dbg(dev, "ehci-msm PM suspend\n");
+
+ /*
+ * EHCI helper function has also the same check before manipulating
+ * port wakeup flags. We do check here the same condition before
+ * calling the same helper function to avoid bringing hardware
+ * from Low power mode when there is no need for adjusting port
+ * wakeup flags.
+ */
+ if (hcd->self.root_hub->do_remote_wakeup && !wakeup) {
+ pm_runtime_resume(dev);
+ ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd),
+ wakeup);
+ }
+
+ return 0;
+}
+
+static int ehci_msm_pm_resume(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+ dev_dbg(dev, "ehci-msm PM resume\n");
+ ehci_prepare_ports_for_controller_resume(hcd_to_ehci(hcd));
+
+ return 0;
+}
+#else
+#define ehci_msm_pm_suspend NULL
+#define ehci_msm_pm_resume NULL
+#endif
+
+static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
+ .suspend = ehci_msm_pm_suspend,
+ .resume = ehci_msm_pm_resume,
+};
+
static struct platform_driver ehci_msm_driver = {
.probe = ehci_msm_probe,
.remove = __devexit_p(ehci_msm_remove),
.driver = {
.name = "msm_hsusb_host",
+ .pm = &ehci_msm_dev_pm_ops,
},
};