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Subject[PATCH 2/2] platform/chrome: cros_ec_types: Support disconnect events without partners
Date
There are certain scenarios, where a disconnect event might
occur on a Type-C port with no port partners. This is required
to enable communication to Burnside Bridge USB4 retimers.

Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
---
drivers/platform/chrome/cros_ec_typec.c | 26 ++++++++++++++++++-------
1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 3d8ff3f8a514..d89fe51b74b1 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -203,20 +203,26 @@ static void cros_typec_unregister_altmodes(struct cros_typec_data *typec, int po
}
}

-static void cros_typec_remove_partner(struct cros_typec_data *typec,
- int port_num)
+static int cros_typec_usb_disconnect_state(struct cros_typec_port *port)
{
- struct cros_typec_port *port = typec->ports[port_num];
-
- cros_typec_unregister_altmodes(typec, port_num, true);
-
port->state.alt = NULL;
port->state.mode = TYPEC_STATE_USB;
port->state.data = NULL;

usb_role_switch_set_role(port->role_sw, USB_ROLE_NONE);
typec_switch_set(port->ori_sw, TYPEC_ORIENTATION_NONE);
- typec_mux_set(port->mux, &port->state);
+
+ return typec_mux_set(port->mux, &port->state);
+}
+
+static void cros_typec_remove_partner(struct cros_typec_data *typec,
+ int port_num)
+{
+ struct cros_typec_port *port = typec->ports[port_num];
+
+ cros_typec_unregister_altmodes(typec, port_num, true);
+
+ cros_typec_usb_disconnect_state(port);

typec_unregister_partner(port->partner);
port->partner = NULL;
@@ -536,6 +542,11 @@ static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
enum typec_orientation orientation;
int ret;

+ if (mux_flags == USB_PD_MUX_NONE) {
+ ret = cros_typec_usb_disconnect_state(port);
+ goto mux_ack;
+ }
+
if (mux_flags & USB_PD_MUX_POLARITY_INVERTED)
orientation = TYPEC_ORIENTATION_REVERSE;
else
@@ -569,6 +580,7 @@ static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
mux_flags);
}

+mux_ack:
if (!typec->needs_mux_ack)
return ret;

--
2.30.0
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