usb: typec: tipd: HACK: Use drm oob hotplug event

This is not how dp-altmode support should be implemented but it works
for new. Requires a "displayport" property in the connector node with a
phandle of the connector.

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

drivers/usb/typec/tipd/core.c

@@ -6,6 +6,8 @@
  * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
  */
 
+#include <drm/drm_connector.h>
+
 #include <linux/i2c.h>
 #include <linux/acpi.h>
 #include <linux/gpio/consumer.h>
@@ -225,6 +227,8 @@ struct cd321x {
 	struct cd321x_status update_status;
 	struct delayed_work update_work;
 	struct usb_pd_identity cur_partner_identity;
+
+	struct fwnode_handle *connector_fwnode;
 };
 
 static enum power_supply_property tps6598x_psy_props[] = {
@@ -763,6 +767,9 @@ static void cd321x_update_work(struct work_struct *work)
 	bool usb_connection = st.data_status &
 			      (TPS_DATA_STATUS_USB2_CONNECTION | TPS_DATA_STATUS_USB3_CONNECTION);
 
+	bool dp_hpd = st.data_status & CD321X_DATA_STATUS_HPD_LEVEL;
+	bool dp_hpd_changed = st.data_status_changed & CD321X_DATA_STATUS_HPD_LEVEL;
+
 	enum usb_role old_role = usb_role_switch_get_role(tps->role_sw);
 	enum usb_role new_role = USB_ROLE_NONE;
 	enum typec_pwr_opmode pwr_opmode = TYPEC_PWR_MODE_USB;
@@ -791,6 +798,10 @@ static void cd321x_update_work(struct work_struct *work)
 	if (old_role != USB_ROLE_NONE && (new_role != old_role || was_disconnected))
 		usb_role_switch_set_role(tps->role_sw, USB_ROLE_NONE);
 
+	if (cd321x->connector_fwnode && (!dp_hpd || dp_hpd_changed)) {
+		drm_connector_oob_hotplug_event(cd321x->connector_fwnode, connector_status_disconnected);
+	}
+
 	/* Process partner disconnection or change */
 	if (!new_connected || partner_changed) {
 		if (!IS_ERR(tps->partner))
@@ -845,6 +856,9 @@ static void cd321x_update_work(struct work_struct *work)
 	/* Launch the USB role switch */
 	usb_role_switch_set_role(tps->role_sw, new_role);
 
+	if (cd321x->connector_fwnode && dp_hpd)
+		drm_connector_oob_hotplug_event(cd321x->connector_fwnode, connector_status_connected);
+
 	power_supply_changed(tps->psy);
 }
 
@@ -1281,6 +1295,7 @@ static int
 cd321x_register_port(struct tps6598x *tps, struct fwnode_handle *fwnode)
 {
 	struct cd321x *cd321x = container_of(tps, struct cd321x, tps);
+	struct fwnode_handle *connector_fwnode = NULL;
 	int ret;
 
 	INIT_DELAYED_WORK(&cd321x->update_work, cd321x_update_work);
@@ -1299,6 +1314,11 @@ cd321x_register_port(struct tps6598x *tps, struct fwnode_handle *fwnode)
 		goto err_unregister_altmodes;
 	}
 
+	if (fwnode_property_present(fwnode, "displayport"))
+		connector_fwnode = fwnode_find_reference(fwnode, "displayport", 0);
+	if (!IS_ERR_OR_NULL(connector_fwnode))
+		cd321x->connector_fwnode = connector_fwnode;
+
 	cd321x->state.alt = NULL;
 	cd321x->state.mode = TYPEC_STATE_SAFE;
 	cd321x->state.data = NULL;