Re: [PATCH RFC 2/2] usb: ehci-omap: add suspend/resume support

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On Thu, 13 May 2010, Anand Gadiyar wrote:

> Add support for suspend and resume to the ehci-omap driver.
> Added routines for platform_driver suspend/resume and 
> wrappers around ehci_bus_suspend/resume.

> +#ifdef CONFIG_PM
>  /*-------------------------------------------------------------------------*/
> +static int ehci_omap_dev_suspend(struct device *dev)
> +{
> +	struct ehci_hcd_omap *omap = dev_get_drvdata(dev);
> +
> +	if (!omap->suspended)
> +		ehci_omap_enable(omap, 0);
> +	return 0;
> +}
> +
> +static int ehci_omap_dev_resume(struct device *dev)
> +{
> +	struct ehci_hcd_omap *omap = dev_get_drvdata(dev);
> +
> +	if (omap->suspended)
> +		ehci_omap_enable(omap, 1);
> +	return 0;
> +}
> +
> +static int ehci_omap_bus_suspend(struct usb_hcd *hcd)
> +{
> +	struct usb_bus *bus = hcd_to_bus(hcd);
> +	int ret;
> +
> +	ret = ehci_bus_suspend(hcd);
> +
> +	ehci_omap_dev_suspend(bus->controller);
> +
> +	return ret;
> +}
> +static int ehci_omap_bus_resume(struct usb_hcd *hcd)
> +{
> +	struct usb_bus *bus = hcd_to_bus(hcd);
> +	int ret;
> +
> +	ehci_omap_dev_resume(bus->controller);
> +
> +	ret = ehci_bus_resume(hcd);
> +
> +	return ret;
> +}

You could use the runtime-PM interface instead of explicitly suspending 
and resuming the controller.  It is now standard.

Alan Stern

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