linux-kernel - [PATCH 10/11] staging: typec: tcpm: Do not send PING msgs in TCPM

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Message-Id: <20170827065200.3305-1-Badhri@google.com>
Date:   Sat, 26 Aug 2017 23:52:00 -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 10/11] staging: typec: tcpm: Do not send PING msgs in TCPM

PING messages are used to monitor the connect/disconnect.
However, when PD is carried over CC, so this is not required.

Also, the spec does not clearly say if PD is possible when
Type-c is connected to Type-A/B. So, removing sending
PING messages altogether.

Signed-off-by: Badhri Jagan Sridharan <Badhri@...gle.com>
---
 drivers/staging/typec/tcpm.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
index a7da609006f5..9e0111dea7c4 100644
--- a/drivers/staging/typec/tcpm.c
+++ b/drivers/staging/typec/tcpm.c
@@ -2335,14 +2335,11 @@ static void run_state_machine(struct tcpm_port *port)
 		 * - The system is not operating in PD mode
 		 * or
 		 * - Both partners are connected using a Type-C connector
-		 *   XXX How do we know that ?
+		 *
+		 * There is no actual need to send PD messages since the local
+		 * port type-c and the spec does not clearly say whether PD is
+		 * possible when type-c is connected to Type-A/B
 		 */
-		if (port->pwr_opmode == TYPEC_PWR_MODE_PD &&
-		    !port->op_vsafe5v) {
-			tcpm_pd_send_control(port, PD_CTRL_PING);
-			tcpm_set_state_cond(port, SRC_READY,
-					    PD_T_SOURCE_ACTIVITY);
-		}
 		break;
 	case SRC_WAIT_NEW_CAPABILITIES:
 		/* Nothing to do... */
-- 
2.14.1.342.g6490525c54-goog