[PATCH 07/11 v3] staging: typec: tcpm: Consider port_type while determining unattached_state

[Badhri Jagan Sridharan]

While performing PORT_RESET, upon receiving the cc disconnect
signal from the underlaying tcpc device, TCPM transitions into
unattached state. Consider the current type of port while determining
the unattached state.

In the below logs, although the port_type was set to sink, TCPM
transitioned into SRC_UNATTACHED.

[  762.290654] state change SRC_READY -> PORT_RESET
[  762.324531] Setting voltage/current limit 0 mV 0 mA
[  762.327912] polarity 0
[  762.334864] cc:=0
[  762.347193] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms
[  762.347200] VBUS off
[  762.347203] CC1: 2 -> 0, CC2: 0 -> 0 [state PORT_RESET, polarity 0, disconnected]
[  762.347206] state change PORT_RESET -> SRC_UNATTACHED

Signed-off-by: Badhri Jagan Sridharan <Badhri at google.com>
Reviewed-by: Guenter Roeck <linux at roeck-us.net>
---
Changelog since previous version:
- Only one previous version of the patch was sent.
  Numbering this V3 instead of V2 to keep the sequence
  number in sync with the rest of the patches in the
  patch list.
- added Reviewed-by: Guenter Roeck <linux at roeck-us.net>
- fixed version/sequence numbers
- addressed comment nit

 drivers/staging/typec/tcpm.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
index 0ae33330a5c7..645f43ee83df 100644
--- a/drivers/staging/typec/tcpm.c
+++ b/drivers/staging/typec/tcpm.c
@@ -2117,10 +2117,16 @@ static inline enum tcpm_state ready_state(struct tcpm_port *port)
 
 static inline enum tcpm_state unattached_state(struct tcpm_port *port)
 {
-	if (port->pwr_role == TYPEC_SOURCE)
+	if (port->port_type == TYPEC_PORT_DRP) {
+		if (port->pwr_role == TYPEC_SOURCE)
+			return SRC_UNATTACHED;
+		else
+			return SNK_UNATTACHED;
+	} else if (port->port_type == TYPEC_PORT_DFP) {
 		return SRC_UNATTACHED;
-	else
-		return SNK_UNATTACHED;
+	}
+
+	return SNK_UNATTACHED;
 }
 
 static void tcpm_check_send_discover(struct tcpm_port *port)
-- 
2.14.1.342.g6490525c54-goog