Hi Bin, On Mon, 2018-01-29 at 08:32 -0600, Bin Liu wrote: > On Sat, Jan 27, 2018 at 09:20:56AM +0100, Greg KH wrote: > > On Fri, Jan 26, 2018 at 12:56:26PM -0600, Bin Liu wrote: > > > Hi, > > > > > > A xHCI controller has two logical ports, hs and ss port. Is it > > > possible to disable one port, for example the ss port? If so, how? > > > > Why would you want to do that? > > On the device I have (TI AM57x), PCIe and USB share the ss PHY. Now I am > trying to figure out how to let PCIe use the ss PHY and disable it in > USB. > > Simply removing the ss PHY nodes from USB in devicetree causes kernel > crashes at boot (but the crash log doesn't directly link to USB > subsystem), so I wanted to ask how to disable the xhci ss roothub before > I dig into the crash. Maybe it's helpful to disable u3port with shared PHY but not SS roothub. > > > > > > By disable, I meant the xHCI driver doesn't see the port when the xHCI > > > driver is loaded and doesn't create that usb bus. > > > > That goes against the spec for the hardware from what I can tell. > > Okay, I will look into it from a different direction - focus on the > crash log. > > Thanks, > -Bin. > -- > 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 -- 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
