Re: dwc2 gadget issues

Randy Li
2017-03-02T05:58:52Z

You don't need to send me a private mail, I would suggest you CC me next
time.

On 02/24/2017 03:27 AM, Heiko Stuebner wrote:
> 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.
I tried g_ether and g_serial, it looks fine for me.
>> 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
>
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>

--
Randy Li

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