sunxi: musb: Fix "usb reset" handling

Hi,

Quoted 30 lines · Maxime Ripard

Hi,

Quoted 12 lines · Hans de Goede

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);
        }

Quoted 8 lines

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?

So, I was affected by this issue on a SinA33, even when not switching roles (since the SinA33 is peripheral only). The issue I was seeing what that when I was two subsequent use of any gadget (fastboot, USB ethernet traffic), the second would silently fail on U-boot side with the host failing to enumerate the device.

Quoted 2 lines

Paul pointed me to that thread, and your suggestion on EP0 seems like a good lead, since the ugly http://pastebin.com/9Y6S9Hpw makes it work.

Ah, that is not that ugly actually, I can take that as is if you want me too just submit it to the u-boot list with me in the Cc and I'll pick it up and put it in u-boot-sunxi/next