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>
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@ -150,7 +150,7 @@ config USB_EHCI_MSM
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Enables support for the USB Host controller present on the
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Qualcomm chipsets. Root Hub has inbuilt TT.
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This driver depends on OTG driver for PHY initialization,
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clock management, powering up VBUS.
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clock management, powering up VBUS, and power management.
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config USB_EHCI_HCD_PPC_OF
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bool "EHCI support for PPC USB controller on OF platform bus"
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@ -25,6 +25,7 @@
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/pm_runtime.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/msm_hsusb_hw.h>
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@ -239,7 +240,8 @@ static int ehci_msm_probe(struct platform_device *pdev)
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/*
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* OTG driver takes care of PHY initialization, clock management,
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* powering up VBUS and mapping of registers address space.
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* powering up VBUS, mapping of registers address space and power
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* management.
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*/
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otg = otg_get_transceiver();
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if (!otg) {
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@ -255,6 +257,13 @@ static int ehci_msm_probe(struct platform_device *pdev)
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}
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device_init_wakeup(&pdev->dev, 1);
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/*
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* OTG device parent of HCD takes care of putting
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* hardware into low power mode.
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*/
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pm_runtime_no_callbacks(&pdev->dev);
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pm_runtime_enable(&pdev->dev);
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return 0;
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put_transceiver:
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@ -272,6 +281,8 @@ static int __devexit ehci_msm_remove(struct platform_device *pdev)
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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device_init_wakeup(&pdev->dev, 0);
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pm_runtime_disable(&pdev->dev);
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pm_runtime_set_suspended(&pdev->dev);
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otg_set_host(otg, NULL);
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otg_put_transceiver(otg);
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@ -281,10 +292,54 @@ static int __devexit ehci_msm_remove(struct platform_device *pdev)
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return 0;
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}
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#ifdef CONFIG_PM
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static int ehci_msm_pm_suspend(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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bool wakeup = device_may_wakeup(dev);
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dev_dbg(dev, "ehci-msm PM suspend\n");
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/*
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* EHCI helper function has also the same check before manipulating
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* port wakeup flags. We do check here the same condition before
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* calling the same helper function to avoid bringing hardware
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* from Low power mode when there is no need for adjusting port
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* wakeup flags.
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*/
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if (hcd->self.root_hub->do_remote_wakeup && !wakeup) {
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pm_runtime_resume(dev);
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ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd),
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wakeup);
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}
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return 0;
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}
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static int ehci_msm_pm_resume(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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dev_dbg(dev, "ehci-msm PM resume\n");
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ehci_prepare_ports_for_controller_resume(hcd_to_ehci(hcd));
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return 0;
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}
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#else
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#define ehci_msm_pm_suspend NULL
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#define ehci_msm_pm_resume NULL
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#endif
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static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
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.suspend = ehci_msm_pm_suspend,
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.resume = ehci_msm_pm_resume,
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};
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static struct platform_driver ehci_msm_driver = {
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.probe = ehci_msm_probe,
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.remove = __devexit_p(ehci_msm_remove),
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.driver = {
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.name = "msm_hsusb_host",
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.pm = &ehci_msm_dev_pm_ops,
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},
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};
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