Hi, Felipe Balbi writes: > Kai Ruhnau <kai.ruhnau@xxxxxxxxxxxxx> writes: >> On my i.MX6 SoloX, I have configured one of the OTG ports for a >> combined RNDIS/ECM gadget. After boot, I have two network interfaces >> (usb0 and usb1) which are managed by systemd-networkd. >> >> With kernel 4.9.153, systemd-networkd reports an immediate carrier >> loss when I pull the USB cable from a Windows or macOS host. With >> 4.19.53 or 5.1.15 that carrier loss is only reported when I re-attach >> the cable, meaning there is a "Lost carrier" for the last used >> interface immediately followed by a "Gained carrier" for the newly >> connected interface. > > First of all, thanks for actually testing the most recent stable kernels. Much appreciated :-) Sure. Having so much support for the i.MX6 in mainline helps a lot :) >> I have activated CONFIG_USB_GADGET_DEBUG_FILES, and the contents of >> /proc/driver/rndis-000 don't change when I pull the cable: >> >> Config Nr. 0 >> used : y >> state : RNDIS_DATA_INITIALIZED >> medium : 0x00000000 >> speed : 425984000 >> cable : connected >> vendor ID : 0x00000000 >> vendor : (null) >> >> Only when changing the host to a Mac, it's different: >> Config Nr. 0 >> used : y >> state : RNDIS_UNINITIALIZED >> medium : 0x00000000 >> speed : 425984000 >> cable : connected >> vendor ID : 0x00000000 >> vendor : (null) >> >> Thanks for any help. > > Which peripheral controller is this board using? Is it chipidea? dwc2? > dwc3? High Speed or Super Speed? According to the device tree it's 'fsl,imx6sx-usb' driven by chipidea/ci_hdrc_imx.c When connecting to Windows, the dmesg shows: configfs-gadget gadget: high-speed config #2: c Cheers, Kai
