platform/chrome: cros_ec_typec: USB4 support

With USB4 mode the mux driver needs the Enter_USB Data
Object (EUDO) that was used when the USB mode was entered.
Though the object is not available in the driver, it is
possible to construct it from the information we have.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

drivers/platform/chrome/cros_ec_typec.c

@@ -13,6 +13,7 @@
 #include <linux/platform_data/cros_ec_proto.h>
 #include <linux/platform_data/cros_usbpd_notify.h>
 #include <linux/platform_device.h>
+#include <linux/usb/pd.h>
 #include <linux/usb/typec.h>
 #include <linux/usb/typec_altmode.h>
 #include <linux/usb/typec_dp.h>
@@ -496,6 +497,34 @@ static int cros_typec_enable_dp(struct cros_typec_data *typec,
 	return typec_mux_set(port->mux, &port->state);
 }
 
+static int cros_typec_enable_usb4(struct cros_typec_data *typec,
+				  int port_num,
+				  struct ec_response_usb_pd_control_v2 *pd_ctrl)
+{
+	struct cros_typec_port *port = typec->ports[port_num];
+	struct enter_usb_data data;
+
+	data.eudo = EUDO_USB_MODE_USB4 << EUDO_USB_MODE_SHIFT;
+
+	/* Cable Speed */
+	data.eudo |= pd_ctrl->cable_speed << EUDO_CABLE_SPEED_SHIFT;
+
+	/* Cable Type */
+	if (pd_ctrl->control_flags & USB_PD_CTRL_OPTICAL_CABLE)
+		data.eudo |= EUDO_CABLE_TYPE_OPTICAL << EUDO_CABLE_TYPE_SHIFT;
+	else if (pd_ctrl->control_flags & USB_PD_CTRL_ACTIVE_CABLE)
+		data.eudo |= EUDO_CABLE_TYPE_RE_TIMER << EUDO_CABLE_TYPE_SHIFT;
+
+	data.active_link_training = !!(pd_ctrl->control_flags &
+				       USB_PD_CTRL_ACTIVE_LINK_UNIDIR);
+
+	port->state.alt = NULL;
+	port->state.data = &data;
+	port->state.mode = TYPEC_MODE_USB4;
+
+	return typec_mux_set(port->mux, &port->state);
+}
+
 static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
 				uint8_t mux_flags,
 				struct ec_response_usb_pd_control_v2 *pd_ctrl)
@@ -516,7 +545,9 @@ static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
 	if (ret)
 		return ret;
 
-	if (mux_flags & USB_PD_MUX_TBT_COMPAT_ENABLED) {
+	if (mux_flags & USB_PD_MUX_USB4_ENABLED) {
+		ret = cros_typec_enable_usb4(typec, port_num, pd_ctrl);
+	} else if (mux_flags & USB_PD_MUX_TBT_COMPAT_ENABLED) {
 		ret = cros_typec_enable_tbt(typec, port_num, pd_ctrl);
 	} else if (mux_flags & USB_PD_MUX_DP_ENABLED) {
 		ret = cros_typec_enable_dp(typec, port_num, pd_ctrl);