Re: [PATCH] usb: dwc2: fix multiplier handling in endpoint setup

[Jules Maselbas <jmaselbas@kalray.eu>]

On Tue, Jan 10, 2023 at 04:17:38PM +0100, Michael Grzeschik wrote:
> If the multiplier is 0 in the descriptor bitfield the multiplier count
> is one. For calculating the multiplier count the extra function
> usb_endpoint_maxp_mult should be used. Rework the dwc2 driver to use it
> and make multi packages work.
Yes, the driver seems to expect mc to be in the range of 1 to 3
included (see dwc2_set_ep_maxpacket in driver/usb/dwc2/gadget.c)
This is aslo the range accepted by dwc2 hardware.

However the .mc fields isn't used at all, it should be written
in the epsize register (see macro DXEPTSIZ_MC)


> While at it, we also remove the USB_EP_MAXP_MULT and
> USB_ENDPOINT_MAXP_MASK macros that would stay left unused and are
> defined in include/usb/ch9.ch anyway.
Indeed, this is can be removed.

I've tested this patch on one board and it worked just find.

Tested-by: Jules Maselbas <jmaselbas@kalray.eu>

> Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
> ---
>  drivers/usb/dwc2/gadget.c | 9 +--------
>  1 file changed, 1 insertion(+), 8 deletions(-)
> 
> diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
> index 7070485410..5a72ba795b 100644
> --- a/drivers/usb/dwc2/gadget.c
> +++ b/drivers/usb/dwc2/gadget.c
> @@ -14,13 +14,6 @@
>  #define spin_lock_irqsave(lock, flags) (void)(flags)
>  #define spin_unlock_irqrestore(lock, flags) (void)(flags)
>  
> -#ifndef USB_ENDPOINT_MAXP_MASK
> -#define USB_ENDPOINT_MAXP_MASK	0x07ff
> -#endif
> -#ifndef USB_EP_MAXP_MULT
> -#define USB_EP_MAXP_MULT(m)	(((m) & 0x1800) >> 11)
> -#endif
> -
>  static void kill_all_requests(struct dwc2 *, struct dwc2_ep *, int);
>  
>  static inline struct dwc2_ep *index_to_ep(struct dwc2 *dwc2,
> @@ -484,7 +477,7 @@ static int dwc2_ep_enable(struct usb_ep *ep,
>  
>  	ep_type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
>  	mps = usb_endpoint_maxp(desc) & USB_ENDPOINT_MAXP_MASK;
> -	mc =  USB_EP_MAXP_MULT(usb_endpoint_maxp(desc));
> +	mc = usb_endpoint_maxp_mult(desc);
>  
>  	/* note, we handle this here instead of dwc2_set_ep_maxpacket */
>  	epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index);
> -- 
> 2.30.2
> 
> 
> 
> 
> 
>