Commit ead4c124 authored by Thinh Nguyen's avatar Thinh Nguyen Committed by Greg Kroah-Hartman
Browse files

usb: gadget: Introduce udc_set_ssp_rate() for SSP 



A SuperSpeed Plus device may operate at different speed and lane count
(i.e. gen2x2, gen1x2, or gen2x1). Introduce gadget ops
udc_set_ssp_rate() to set the desire corresponding usb_ssp_rate for
SuperSpeed Plus capable devices.

If the USB device supports different speeds at SuperSpeed Plus, set the
device to operate with the maximum number of lanes and speed.

Signed-off-by: default avatarThinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/9b85357cdadc02e3f0d653fd05f89eb46af836e1.1610592135.git.Thinh.Nguyen@synopsys.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent db615c62

drivers/usb/gadget/udc/core.c

+11 −5
Original line number Diff line number Diff line
@@ -1133,12 +1133,18 @@ static inline void usb_gadget_udc_stop(struct usb_udc *udc) 
static inline void usb_gadget_udc_set_speed(struct usb_udc *udc,

					    enum usb_device_speed speed)

{

	if (udc->gadget->ops->udc_set_speed) {

	struct usb_gadget *gadget = udc->gadget;

	enum usb_device_speed s;



		s = min(speed, udc->gadget->max_speed);

		udc->gadget->ops->udc_set_speed(udc->gadget, s);

	}

	if (speed == USB_SPEED_UNKNOWN)

		s = gadget->max_speed;

	else

		s = min(speed, gadget->max_speed);



	if (s == USB_SPEED_SUPER_PLUS && gadget->ops->udc_set_ssp_rate)

		gadget->ops->udc_set_ssp_rate(gadget, gadget->max_ssp_rate);

	else if (gadget->ops->udc_set_speed)

		gadget->ops->udc_set_speed(gadget, s);

}



/**

include/linux/usb/gadget.h

+2 −0
Original line number Diff line number Diff line
@@ -323,6 +323,8 @@ struct usb_gadget_ops { 
			struct usb_gadget_driver *);

	int	(*udc_stop)(struct usb_gadget *);

	void	(*udc_set_speed)(struct usb_gadget *, enum usb_device_speed);

	void	(*udc_set_ssp_rate)(struct usb_gadget *gadget,

			enum usb_ssp_rate rate);

	struct usb_ep *(*match_ep)(struct usb_gadget *,

			struct usb_endpoint_descriptor *,

			struct usb_ss_ep_comp_descriptor *);