Re: [PATCH 01/11] usb: ch9: Add sublink speed struct

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Hello!

On 17.07.2020 0:58, Thinh Nguyen wrote:

USB 3.2 specification supports dual-lane for super-speed-plus. USB
devices may operate at different sublink speeds. To avoid using magic
numbers and capture the sublink speed better, introduce the
usb_sublink_speed structure and various sublink speed attribute enum.

See SSP BOS descriptor in USB 3.2 specification section 9.6.2.5

Signed-off-by: Thinh Nguyen <thinhn@xxxxxxxxxxxx>
---
  include/uapi/linux/usb/ch9.h | 42 ++++++++++++++++++++++++++++++++++++++++++
  1 file changed, 42 insertions(+)

diff --git a/include/uapi/linux/usb/ch9.h b/include/uapi/linux/usb/ch9.h
index 2b623f36af6b..d4fd403a3664 100644
--- a/include/uapi/linux/usb/ch9.h
+++ b/include/uapi/linux/usb/ch9.h
@@ -1145,6 +1145,48 @@ enum usb_device_speed {
  	USB_SPEED_SUPER_PLUS,			/* usb 3.1 */
  };
+/* USB 3.2 sublink speed attributes */
+
+enum usb_lane_speed_exponent {
+	USB_LSE_BPS = 0,
+	USB_LSE_KBPS = 1,
+	USB_LSE_MBPS = 2,
+	USB_LSE_GBPS = 3,
+};
+
+enum usb_sublink_type {
+	USB_ST_SYMMETRIC_RX = 0,
+	USB_ST_ASYMMETRIC_RX = 1,
+	USB_ST_SYMMETRIC_TX = 2,
+	USB_ST_ASYMMETRIC_TX = 3,
+};
+
+enum usb_link_protocol {
+	USB_LP_SS = 0,
+	USB_LP_SSP = 1,
+};
+
+/**
+ * struct usb_sublink_speed - sublink speed attribute
+ * @id: sublink speed attribute ID (SSID)
+ * @mantissa: lane speed mantissa
+ * @exponent: lane speed exponent
+ * @sublink type: sublink type

   It's called just 'type' below.

+ * @protocol: sublink protocol
+ *
+ * Super-speed-plus supports multiple lanes. Use the sublink speed attributes to
+ * describe the sublink speed.
+ *
+ * See USB 3.2 spec section 9.6.2.6 for super-speed-plus capability for more
+ * information.
+ */
+struct usb_sublink_speed {
+	u8				id;
+	u16				mantissa;
+	enum usb_lane_speed_exponent	exponent;
+	enum usb_sublink_type		type;
+	enum usb_link_protocol		protocol;
+};
enum usb_device_state {
  	/* NOTATTACHED isn't in the USB spec, and this state acts

MBR, Sergei





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