DWC OTG patch to test

[Edward Tomasz Napierała]

Works perfectly, thanks!

On 0630T2259, Hans Petter Selasky wrote:
> Hi,
> 
> The attached patch should fix detection of USB detach, if you connect a 
> USB device directly to the RPI, not via the built-in USB HUB, for 
> example using RPI-zero. If you have a RPI-zero running FreeBSD - please 
> test.
> 
> --HPS

> Index: sys/dev/usb/controller/dwc_otg.c
> ===================================================================
> --- sys/dev/usb/controller/dwc_otg.c	(revision 300199)
> +++ sys/dev/usb/controller/dwc_otg.c	(working copy)
> @@ -2985,7 +2985,8 @@
>  		else
>  			sc->sc_flags.status_bus_reset = 0;
>  
> -		if (hprt & HPRT_PRTENCHNG)
> +		if ((hprt & HPRT_PRTENCHNG) &&
> +		    (hprt & HPRT_PRTENA) == 0)
>  			sc->sc_flags.change_enabled = 1;
>  
>  		if (hprt & HPRT_PRTENA)
> @@ -4745,6 +4746,8 @@
>  
>  	value = 0;
>  
> +	if (sc->sc_flags.change_enabled)
> +		value |= UPS_C_PORT_ENABLED;
>  	if (sc->sc_flags.change_connect)
>  		value |= UPS_C_CONNECT_STATUS;
>  	if (sc->sc_flags.change_suspend)