[PATCH v1 1/1] usb: ci_udc: don't use "advance" feature when setting address

[Svyatoslav Ryhel]

нд, 27 жовт. 2024 р. о 18:09 Marek Vasut <marex at denx.de> пише:
>
> On 10/13/24 4:58 PM, Svyatoslav Ryhel wrote:
>
> Sorry for the late reply.
>
> > +++ b/drivers/usb/gadget/ci_udc.c
> > @@ -649,12 +649,30 @@ static void flip_ep0_direction(void)
> >       }
> >   }
> >
> > +/*
> > + * This function explicitly sets the address, without the "USBADRA" (advance)
> > + * feature, which is not supported by older versions of the controller.
> > + */
> > +static void ci_set_address(struct ci_udc *udc, u8 address)
> > +{
> > +     DBG("%s %x\n", __func__, address);
>
> log_debug() or dev_dbg() please.
>

DBG macro is used across entire driver, if you wish to replace it,
then pls, send a followup with patch for entire driver. This is out of
scope of this patch.

> > +     writel(address << 25, &udc->devaddr);
> > +}
> > +
> >   static void handle_ep_complete(struct ci_ep *ci_ep)
> >   {
> >       struct ept_queue_item *item, *next_td;
> >       int num, in, len, j;
> >       struct ci_req *ci_req;
> >
> > +     /* Set the device address that was previously sent by SET_ADDRESS */
> > +     if (controller.next_device_address != 0) {
> > +             struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
> > +
> > +             ci_set_address(udc, controller.next_device_address);
> > +             controller.next_device_address = 0;
> > +     }
> > +
> >       num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
> >       in = (ci_ep->desc->bEndpointAddress & USB_DIR_IN) != 0;
> >       item = ci_get_qtd(num, in);
> > @@ -783,7 +801,7 @@ static void handle_setup(void)
> >                * write address delayed (will take effect
> >                * after the next IN txn)
> >                */
> > -             writel((r.wValue << 25) | (1 << 24), &udc->devaddr);
> > +             controller.next_device_address = r.wValue;
>
> wValue is word , u16 , but next_device_address is u8 below , why ?
>

wValue is u16 but only 8 bits are relevant since USB address is 8 bit,
hence u8. Changing wValue to u8 is out of scope of this patch as well.

> >               req->length = 0;
> >               usb_ep_queue(controller.gadget.ep0, req, 0);
> >               return;
> > @@ -814,6 +832,9 @@ static void stop_activity(void)
> >       int i, num, in;
> >       struct ept_queue_head *head;
> >       struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
> > +
> > +     ci_set_address(udc, 0);
> > +
> >       writel(readl(&udc->epcomp), &udc->epcomp);
> >   #ifdef CONFIG_CI_UDC_HAS_HOSTPC
> >       writel(readl(&udc->epsetupstat), &udc->epsetupstat);
> > @@ -934,6 +955,7 @@ static int ci_pullup(struct usb_gadget *gadget, int is_on)
> >       struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
> >       if (is_on) {
> >               /* RESET */
> > +             controller.next_device_address = 0;
> >               writel(USBCMD_ITC(MICRO_8FRAME) | USBCMD_RST, &udc->usbcmd);
> >               udelay(200);
> >
> > diff --git a/drivers/usb/gadget/ci_udc.h b/drivers/usb/gadget/ci_udc.h
> > index bea2f9f3fe3..807f2084c1e 100644
> > --- a/drivers/usb/gadget/ci_udc.h
> > +++ b/drivers/usb/gadget/ci_udc.h
> > @@ -105,6 +105,7 @@ struct ci_drv {
> >       struct ept_queue_head           *epts;
> >       uint8_t                         *items_mem;
> >       struct ci_ep                    ep[NUM_ENDPOINTS];
> > +     u8                              next_device_address;
>
> Should this be u16 ?

No, USB address is only 8bits (u8)