[U-Boot] [PATCH 0/2] sunxi: musb: Fix "usb reset" handling

[Marek Vasut]

On Friday, June 19, 2015 at 03:07:04 PM, Hans de Goede wrote:
> Hi,
> 
> On 19-06-15 14:35, Marek Vasut wrote:
> > On Sunday, June 14, 2015 at 12:40:11 PM, Hans de Goede wrote:
> >> Hi Ian, Paul,
> >> 
> >> Here is a patch to fix the problems where most usb devices will no
> >> longer work after a "usb reset ", when connected to the otg controller
> >> in host mode + a related cleanup patch.
> >> 
> >> Ian I would like to send out a PR with these 2 as fixed for v2015.07,
> >> can you review them please? Note I've not tested this with the otg in
> >> gadget mode, but we do not have gadget mode enabled by default anywhere
> >> atm, so I still consider this suitable as a bugfix for v2015.07.
> >> 
> >> Paul, can you test these with gadget mode? Specifically if they help the
> >> problem you were seeing when switching roles?
> >> 
> >> Also this bit from the kernel code for the sunxi glue may be relevant
> >> 
> >> to your problems:
> >>          if ((musb->int_usb & MUSB_INTR_RESET) && !is_host_active(musb))
> >>          {
> >>          
> >>                  /* ep0 FADDR must be 0 when (re)entering peripheral
> >>                  mode */ musb_ep_select(musb->mregs, 0);
> >>                  musb_writeb(musb->mregs, MUSB_FADDR, 0);
> >>          
> >>          }
> >> 
> >> This is from the interrupt handler in the sunxi-musb glue in the kernel,
> >> 
> >> maybe we can do the same, and/or maybe we need to do:
> >> 	/* ep0 FADDR must be 0 when (re)entering peripheral mode */
> >> 	musb_ep_select(musb->mregs, 0);
> >> 	musb_writeb(musb->mregs, MUSB_FADDR, 0);
> >> 	
> >>  From sunxi_musb_disable?
> >>  
> >>  From my experience sofar we should avoid doing a full reset from
> >>  musb_stop
> >> 
> >> / sunxi_musb_disable as musb_init_controller never gets re-run, so doing
> >> a full reset leaves things in a bad state where only ep0 still seems to
> >> work, this may be what you were seeing before.
> > 
> > Hi,
> > 
> > do you want me to pick this via u-boot-usb/master ?
> 
> No, I've already send a pull-req for them via u-boot-sunxi/master and they
> are already merged :)

OK, roger.

Best regards,
Marek Vasut