Hi Heiko, On 2/5/2020 6:37 PM, Heiko Stuebner wrote: > Hi, > > right now we're experiencing strange behaviour with a dwc2 on Rockchip's > PX30 soc. > > With a cable connected to the port, the configfs-snippet below seems to > work and at least creates a acm device on the host. Though I'm told that a > picocom -b 115200 /dev/ttyACM > sometimes works ok but also sometimes returns -EBUSY or hangs. > [But I guess that is a separate problem] > > But if there is no cable connected when trying to do the configfs steps > we end up with > dwc2_core_reset: HANG! Soft Reset timeout GRSTCTL GRSTCTL_CSFTRST > and no gadget gets configured. > Which timeout value set to wait GRSTCTL cleared? Does this commit applied: 6689f0f4bb14e "usb: dwc2: use a longer core rest timeout in dwc2_core_reset()"? If yes, can you send debug log for above case. Thanks, Minas > > So I guess to get a feeling for the issue, is this something to be > expected, or at least a known issue, with maybe a fix flying around > somewhere? > > Or is this working on other dwc2 platforms correctly and is caused > by some other part talking to the dwc2 doing strange things? > > > Thanks > Heiko > > -------- 8< ---- configfs snippet ------ >8 -------- > cd /configfs/usb_gadget > mkdir g1 > cd g1 > echo "0x1d6d" > idVendor > echo "0x0104" > idProduct > mkdir strings/0x409 > echo "0123456789" > strings/0x409/serialnumber > echo "Theobroma Systems" > strings/0x409/manufacturer > echo "Cobra Debug Serial" > strings/0x409/product > > # create config > mkdir configs/c.1 > mkdir configs/c.1/strings/0x409 > echo "conf1" > configs/c.1/strings/0x409/configuration > > # create function > mkdir functions/acm.usb0 > ln -s functions/acm.usb0 configs/c.1 > > # activate new config > echo "" > UDC > echo "ff300000.usb" > UDC > > >
