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usb: gadget: Introduce udc_set_ssp_rate() for SSP

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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: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/9b85357cdadc02e3f0d653fd05f89eb46af836e1.1610592135.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thinh Nguyen 2021-01-13 18:53:07 -08:00 committed by Greg Kroah-Hartman
parent db615c6264
commit ead4c12485
2 changed files with 13 additions and 5 deletions
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16
drivers/usb/gadget/udc/core.c
View file

@ -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) {
enum usb_device_speed s;
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);
}
/**

2
include/linux/usb/gadget.h
View file

@ -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 *);