[Linux-stm32] [PATCH V4 21/22] ARM: dts: stm32: Add bindings for USB on AV96

[Marek Vasut]

On 4/10/20 11:08 AM, Manivannan Sadhasivam wrote:
> Hi,

Hi,

> On Tue, Apr 07, 2020 at 08:37:50PM +0200, Marek Vasut wrote:
>> On 4/6/20 1:08 PM, Marek Vasut wrote:
>>> On 4/6/20 9:22 AM, Manivannan Sadhasivam wrote:
>>>> On Wed, Apr 01, 2020 at 03:22:36PM +0200, Marek Vasut wrote:
>>>>> Fill in the bindings for USB host and gadget on AV96.
>>>>>
>>>>> Signed-off-by: Marek Vasut <marex at denx.de>
>>>>
>>>> I can't get the USB B-Micro OTG port to work with this patch. Do I need to
>>>> enable any configs other than PHY and USB DWC2 drivers?
>>>
>>> Only the DWC2 GADGET (and possibly host, for dual-role) and some gadget
>>> implementation (e.g. gadget zero).
>>
>> I think I see what doesn't work for you.
>>
>> It seems the following works on next:
>> power on -> plug in USB stick (or any other USB device) -> unplug ->
>> plug in usb host (e.g. PC)
>>
>> But this does not:
>> power on -> plug in usb host (e.g. PC)
>>  - the PC is not detected
>>
> 
> Both doesn't work. I have the rndis gadget configured in userspace but plugging
> in the micro-b cable doesn't do anything.
> 
>> Did that ^ ever work for you before ? I suspect this is a bug in the
>> DWC2 driver. The OTG operation there is known to be flaky at best.
> 
> Not on this board. I don't recall what happended with vendor image. But I do
> have another STM32MP1 based 96Board (which will be submitted soon), there I can
> get OTG port working.
> 
> But in that board a BG96 modem is connected to USB2 port on the board itself
> which gets enumerated during probe.

But it's not configured as OTG on this other board, right ?