linux-kernel - [PATCH] staging: typec: tcpm: Consider port_type while determining unattached

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Message-Id: <20170810220633.15343-1-Badhri@google.com>
Date:   Thu, 10 Aug 2017 15:06:33 -0700
From:   Badhri Jagan Sridharan <badhri@...gle.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Badhri Jagan Sridharan <Badhri@...gle.com>
Subject: [PATCH] staging: typec: tcpm: Consider port_type while determining unattached_state

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@...gle.com>
---
 drivers/staging/typec/tcpm.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
index 20eb4ebcf8c3..4c526341d850 100644
--- a/drivers/staging/typec/tcpm.c
+++ b/drivers/staging/typec/tcpm.c
@@ -2099,10 +2099,16 @@ 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
+	} else {
 		return SNK_UNATTACHED;
+	}
 }
 
 static void tcpm_check_send_discover(struct tcpm_port *port)
-- 
2.14.0.434.g98096fd7a8-goog