sunxi: musb: Fix "usb reset" handling

Hi,

Quoted 24 lines · Maxime Ripard

Hi,

Quoted 20 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);
        }

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?

Quoted 2 lines

So, I was affected by this issue on a SinA33, even when not switching roles (since the SinA33 is peripheral only).

Missed this the first reply, are you sure, that is somewhat weird. I mean it is possible if they did not hook up the id pin, or do not allow you to send out +5v, but it is weird. I guess they did route the real usb-host to an USB-A receptacle on that board, so it is not a big deal, right ?