On Tue, 6 Jun 2017, lingareddy praneethreddy wrote: > I am using Chipidea HDRC on imx6sl platform. On connecting USB stick > (sometimes) and Android/ Apple phone (frequent) to ci-hdrc multiple > time it is seen that hub (ehci_hub_control()) reports continuous > USB_PORT_FEAT_C_RESET (infinitely) before a disconnect-connect caused > USB_PORT_FEAT_C_OVER_CURRENT. Can you post a debugging log? Do: echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control before plugging in the device, and then copy the dmesg output. > I have two queries: > 1. Can we avoid the continuous warm reset ( USB_PORT_FEAT_C_RESET ) > i.e. can we force hub to initialize again and enumerate the device > again? Reset _does_ initialize and enumerate the device again. > 2. Do we need to initialize both controller and hub i.e. we > initialized controller (calling ehci_setup() and ehci_run()) but the > hub continued the resets until the overcurrent bit was set. I don't understand this question. But remember, the hardware does not decide when to issue a reset. That decision is made by the driver software in the kernel. 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
