usb: gadget: Introduce SSP rates and lanes

A USB device controller operating in SuperSpeed Plus may support gen2x1,
gen1x2, and/or gen2x2. Introduce SuperSpeed Plus signaling rate
generation and lane count to usb_gadget with the fields ssp_rate and
max_ssp_rate. The gadget driver can use these to setup the device BOS
descriptor and select the desire operating speed and number of lanes.

Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/b6d2196dcc3c73747f91abf9a082b20bbe276cc4.1610592135.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index e7351d6..02483c8 100644 (file)
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -339,6 +339,10 @@ struct usb_gadget_ops {
  * @speed: Speed of current connection to USB host.
  * @max_speed: Maximal speed the UDC can handle.  UDC must support this
  *      and all slower speeds.
+ * @ssp_rate: Current connected SuperSpeed Plus signaling rate and lane count.
+ * @max_ssp_rate: Maximum SuperSpeed Plus signaling rate and lane count the UDC
+ *     can handle. The UDC must support this and all slower speeds and lower
+ *     number of lanes.
  * @state: the state we are now (attached, suspended, configured, etc)
  * @name: Identifies the controller hardware type.  Used in diagnostics
  *     and sometimes configuration.
@@ -406,6 +410,11 @@ struct usb_gadget {
        struct list_head                ep_list;        /* of usb_ep */
        enum usb_device_speed           speed;
        enum usb_device_speed           max_speed;
+
+       /* USB SuperSpeed Plus only */
+       enum usb_ssp_rate               ssp_rate;
+       enum usb_ssp_rate               max_ssp_rate;
+
        enum usb_device_state           state;
        const char                      *name;
        struct device                   dev;