The USB 3.2 specification supports dual-lane and different transfer
rates for super-speed-plus. Devices operating in super-speed-plus can
be gen2x1, gen1x2, or gen2x2.
A gadget driver may need to know the gadget's sublink speeds to properly
setup its transfer requests and describe its capability in its
descriptors. To describe the transfer rate in super-speed-plus fully,
let's expose the lane count and sublink speed attributes when operating
in super-speed-plus.
Signed-off-by: Thinh Nguyen <thinhn@xxxxxxxxxxxx>
---
include/linux/usb/gadget.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 6a178177e4c9..2ab929eed928 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -338,6 +338,15 @@ 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.
+ * @num_lanes: Number of lanes in use.
+ * @max_num_lanes: Maximum number of lanes the UDC supports.
+ * @ssac: Sublink speed attribute count. The number of sublink speed
+ * attributes is ssac + 1.
+ * @sublink_speed: Array of sublink speed attributes the UDC supports. Sublink
+ * speed attributes are paired, and an RX followed by a TX attribute.
+ * @speed_ssid: Current sublink speed attribute ID in use.
+ * @min_speed_ssid: Sublink speed attribute ID with the minimum speed.
+ * @max_speed_ssid: Sublink speed attribute ID with the maximum speed.
* @state: the state we are now (attached, suspended, configured, etc)
* @name: Identifies the controller hardware type. Used in diagnostics
* and sometimes configuration.
@@ -405,6 +414,17 @@ struct usb_gadget {
struct list_head ep_list; /* of usb_ep */
enum usb_device_speed speed;
enum usb_device_speed max_speed;
+
+ /* SSP only */
+ unsigned num_lanes;
+ unsigned max_num_lanes;
+ unsigned ssac;
+#define USB_GADGET_MAX_SSAC 3
+ struct usb_sublink_speed sublink_speed[USB_GADGET_MAX_SSAC + 1];
+ unsigned speed_ssid;
+ unsigned min_speed_ssid;
+ unsigned max_speed_ssid;
+
enum usb_device_state state;
const char *name;
struct device dev;
--
2.11.0
