On Mon, 22 Dec 2014, Wu Liang feng wrote: > The EHCI controller doesn't properly detect the case when
"The" EHCI controller? I don't know what EHCI controller you're talking about, but my controllers don't have any trouble detecting device removal during suspend. > a device is removed during suspend. Specifically,when we > resume from suspend the EHCI controller maintaining the > USB state (FLAG_CF is 1 Current Connect Status is 1) but > a USB device (like a USB camera on rk3288) may have been > disconnected actually. > > Let's add a quirk to force ehci to go into the > usb_root_hub_lost_power() path and reset after resume. > This should generally reset the whole controller and all > ports and initialize everything cleanly again, and bring > the devices back up. Isn't this solution too extreme? What if the device was a flash storage drive and it wasn't unplugged during suspend? This patch would force it to be removed, messing up any mounted filesystems, when there was no need. Can you find a better way to work around the problem? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
