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>

2 files changed, 57 insertions, 2 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index d8665ec0565b..b9cc31172fbd 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -150,7 +150,7 @@ config USB_EHCI_MSM
           Enables support for the USB Host controller present on the
           Qualcomm chipsets. Root Hub has inbuilt TT.
           This driver depends on OTG driver for PHY initialization,
-          clock management, powering up VBUS.
+          clock management, powering up VBUS, and power management.
 
 config USB_EHCI_HCD_PPC_OF
         bool "EHCI support for PPC USB controller on OF platform bus"
diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c
index 9ed855986599..413f4deca532 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 @@ static int ehci_msm_probe(struct platform_device *pdev)
 
         /*
          * 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 @@ static int ehci_msm_probe(struct platform_device *pdev)
         }
 
         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 @@ static int __devexit ehci_msm_remove(struct platform_device *pdev)
         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 @@ static int __devexit ehci_msm_remove(struct platform_device *pdev)
         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,
         },
 };