platform/chrome: cros_ec_typec: Handle hard reset

The Chrome Embedded Controller (EC) generates a hard reset type C event
when a USB Power Delivery (PD) hard reset is encountered. Handle this
event by unregistering the partner and cable on the associated port and
clearing the event flag.

Cc: Benson Leung <bleung@chromium.org>
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Link: https://lore.kernel.org/r/20210420171617.3830902-2-pmalani@chromium.org

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 1a06b8c..60c2191 100644 (file)
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -906,6 +906,19 @@ static void cros_typec_handle_status(struct cros_typec_data *typec, int port_num
                return;
        }
 
+       /* If we got a hard reset, unregister everything and return. */
+       if (resp.events & PD_STATUS_EVENT_HARD_RESET) {
+               cros_typec_remove_partner(typec, port_num);
+               cros_typec_remove_cable(typec, port_num);
+
+               ret = cros_typec_send_clear_event(typec, port_num,
+                                                 PD_STATUS_EVENT_HARD_RESET);
+               if (ret < 0)
+                       dev_warn(typec->dev,
+                                "Failed hard reset event clear, port: %d\n", port_num);
+               return;
+       }
+
        /* Handle any events appropriately. */
        if (resp.events & PD_STATUS_EVENT_SOP_DISC_DONE && !typec->ports[port_num]->sop_disc_done) {
                u16 sop_revision;