On Wed, 4 Dec 2013, Kumar Gokhare wrote: > Hi Alan, > > Thanks for your response. > > It seems that in my case, the root hub is getting this disconnect > event which is disconnecting all devices. > Could you point me which kernel module raises these event and if any > debugs I can turn on in the kernel configs to more info ? The modules are ehci-hcd and usbcore. There isn't much info to get other than what you have already seen. For instance, it looks like you already have CONFIG_USB_DEBUG enabled. > >> <7>[ 1493.733245] tegra-ehci tegra-ehci.2: GetStatus port 1 status > >> c00100a POWER sig=se0 PEC CSC This message is from the ehci-hcd driver. It says that the hardware's port status value is 0xc00100a, which means no connection, connect change (i.e., there was a disconnection), and enable change. > >> <7>[ 1493.733297] hub 1-0:1.0: port 1, status 0100, change 0003, 12 Mb/s > >> <6>[ 1493.733329] usb 1-1: USB disconnect, address 2 These messages are from the hub driver in usbcore. They mean that the hub driver saw the disconnect status from the EHCI hardware, and it took the appropriate action. > I know I shouldn't expect much support for such an old kernel, but > would be grateful if you can give me some pointers. I'm glad to help, but I don't think you will solve this in software. Alan Stern -- 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
