hi alan 2015-01-19 1:06 GMT+08:00 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>: > On Sun, 18 Jan 2015, Chechun Kuo wrote: > >> for some platform ehci controller, it is possible there is no port power control capability in the root hub. >> And we add port power control determination when getting root hub port status. > > Why do you need to do this? Doesn't the current code always give the > right result? My host controller doesn't support PPC, and the PORT_POWER bit will not be one even when device is powered up. After I checking the ehci spec, it should be HW's issue, since spec say PP should be one even when PPC is zero. Sorry to make you confuse ^^ -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
