Commit 0d7b8758 authored Oct 29, 2014 by Vijayavardhan Vennapusa

usb: ehci-msm: Fix host mode HUB resume issue during runtime suspend



When the micro a cable is connected over hub, hub is auto suspended
and usb entered into low power mode. If usb device is connected to
the suspended hub then root hub is resumed, it doesn't handle the
device resume for received USB asynchronous interrupt and the connected
devices are not resumed.

To fix this drive resume signaling in host mode to wakeup peripherals

CRs-Fixed: 747418
Change-Id: I49899cdd86aa04ecde5e34ff07da8202921ff7c3
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>

parent c3e072e1

drivers/usb/host/ehci-msm.c

+14 −1

Original line number	Diff line number	Diff line
		@@ -197,8 +197,21 @@ static int ehci_msm_runtime_suspend(struct device *dev)

		static int ehci_msm_runtime_resume(struct device *dev)
		{
		struct usb_hcd *hcd = dev_get_drvdata(dev);
		int ret;
		u32 portsc;

		dev_dbg(dev, "ehci runtime resume\n");
		return usb_phy_set_suspend(phy, 0);
		ret = usb_phy_set_suspend(phy, 0);
		if (ret)
		return ret;

		portsc = readl_relaxed(USB_PORTSC);
		portsc &= ~PORT_RWC_BITS;
		portsc \|= PORT_RESUME;
		writel_relaxed(portsc, USB_PORTSC);

		return ret;
		}
		#endif