Hi Francesco, Am Donnerstag, 23. Februar 2017, 19:11:37 CET schrieb Francesco Lavra: > I'm having trouble getting the RK3288 OTG controller (the one at > ff580000) to work in peripheral mode. I'm using a Firefly Reload board, > and I know the hardware is fine because I can successfully use the port > in device mode with U-Boot's mass storage gadget driver. > Under Linux, the OTG port works fine when used in host mode, but fails > to work in device mode: nothing happens when the a USB host is plugged > into the OTG port, not even a single interrupt is generated by the > controller. I'm using the latest device tree definitions from > git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git. you shouldn't use my tree as base for any real work :-) . Best to use the regular mainline kernel or alternatively try linux-next to get all recent usb changes schedules for the next release. > Tried with different gadget drivers (g_audio, g_ether, g_mass_storage), > but it makes no difference. > Tried also forcing peripheral mode in the device tree, with dr_mode = > "peripheral", to no avail. > > Are there any known problems with the RK3288 OTG controller? In general the controller is a dwc2 and there was quite some activity on the driver recently. So maybe really try linux-next first and see if any of the changes included there improve the situation. I've included some usb lists + people, maybe they know if anything recent may have changed things. > Here is the relevant log when the dwc2 driver is loaded at boot: > > [ 1.376935] ff580000.usb supply vusb_d not found, using dummy regulator > [ 1.383683] ff580000.usb supply vusb_a not found, using dummy regulator > [ 1.390627] dwc2 ff580000.usb: dwc2_core_reset() HANG! Soft Reset > GRSTCTL=80000001 > [ 1.509048] dwc2 ff580000.usb: dwc2_wait_for_mode: Couldn't set > device mode > [ 1.750626] dwc2 ff580000.usb: dwc2_check_param_tx_fifo_sizes: > Invalid parameter g-tx-fifo-size, setting to default average > [ 1.761828] dwc2 ff580000.usb: dwc2_check_param_tx_fifo_sizes: > Invalid parameter g_tx_fifo_size[1]=104 > [ 1.771192] dwc2 ff580000.usb: dwc2_check_param_tx_fifo_sizes: > Invalid parameter g_tx_fifo_size[2]=104 > [ 1.780529] dwc2 ff580000.usb: dwc2_check_param_tx_fifo_sizes: > Invalid parameter g_tx_fifo_size[3]=104 > [ 1.789888] dwc2 ff580000.usb: dwc2_check_param_tx_fifo_sizes: > Invalid parameter g_tx_fifo_size[4]=104 > [ 1.799245] dwc2 ff580000.usb: dwc2_check_param_tx_fifo_sizes: > Invalid parameter g_tx_fifo_size[5]=104 > [ 1.808614] dwc2 ff580000.usb: dwc2_check_param_tx_fifo_sizes: > Invalid parameter g_tx_fifo_size[6]=104 > [ 1.817993] usb 1-1: new high-speed USB device number 2 using dwc2 > [ 1.824390] dwc2 ff580000.usb: EPs: 10, dedicated fifos, 972 entries > in SPRAM > [ 1.832098] dwc2 ff580000.usb: DWC OTG Controller > [ 1.836924] dwc2 ff580000.usb: new USB bus registered, assigned bus > number 2 > [ 1.844125] dwc2 ff580000.usb: irq 41, io mem 0xff580000 > [ 1.849747] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002 > [ 1.856598] usb usb2: New USB device strings: Mfr=3, Product=2, > SerialNumber=1 > [ 1.863875] usb usb2: Product: DWC OTG Controller > [ 1.868601] usb usb2: Manufacturer: Linux 4.8.1+ dwc2_hsotg > [ 1.874215] usb usb2: SerialNumber: ff580000.usb > > and this is what I get when I load a gadget driver (in this case, g_audio): > > [ 19.848590] dwc2 ff580000.usb: bound driver g_audio > [ 19.853816] dwc2 ff580000.usb: dwc2_hsotg_enqueue_setup: failed queue > (-11) Heiko
