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

[Manivannan Sadhasivam]

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.

Thanks,
Mani