linux-kernel - [PATCH 11/11] staging: typec: tcpm: Switch to PORT_RESET instead of SNK

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Message-Id: <20170827065233.3524-1-Badhri@google.com>
Date:   Sat, 26 Aug 2017 23:52:33 -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 11/11] staging: typec: tcpm: Switch to PORT_RESET instead of SNK_UNATTACHED

When VBUS is not discovered within PD_T_PS_SOURCE_ON although Rp
is detected on CC, TCPM switches the port to SNK_UNATTACHED
state. SNK_UNATTACHED, however does not force TYPEC_CC_OPEN which
makes the partner(source) to think that it is connected.

To overcome this issue, force the port into PORT_RESET state
to make sure the CC lines are open.

Signed-off-by: Badhri Jagan Sridharan <Badhri@...gle.com>
---
 drivers/staging/typec/tcpm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
index 9e0111dea7c4..47b8fec5ea36 100644
--- a/drivers/staging/typec/tcpm.c
+++ b/drivers/staging/typec/tcpm.c
@@ -2380,7 +2380,7 @@ static void run_state_machine(struct tcpm_port *port)
 				       0);
 		else
 			/* Wait for VBUS, but not forever */
-			tcpm_set_state(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
+			tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON);
 		break;
 
 	case SRC_TRY:
-- 
2.14.1.342.g6490525c54-goog