linux-kernel - [PATCH 2/3 v2] usb: typec: tcpm: Support bist test data mode for compliance

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Message-Id: <20200714231207.866838-2-badhri@google.com>
Date:   Tue, 14 Jul 2020 16:12:06 -0700
From:   Badhri Jagan Sridharan <badhri@...gle.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        reg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Badhri Jagan Sridharan <badhri@...gle.com>
Subject: [PATCH 2/3 v2] usb: typec: tcpm: Support bist test data mode for compliance

TCPM supports BIST carried mode. PD compliance tests require
BIST Test Data to be supported as well.

Introducing set_bist_data callback to signal tcpc driver for
configuring the port controller hardware to enable/disable
BIST Test Data mode.

Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
---
Version history:
Changes since V1:(Guenter's suggestions)
- Split the change into two: TCPM and TCPCI
- Move BIST log to TCPM log
---
 drivers/usb/typec/tcpm/tcpm.c | 11 +++++++++++
 include/linux/usb/tcpm.h      |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 82b19ebd7838e0..379fcab9dbd973 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -2746,6 +2746,11 @@ static void tcpm_detach(struct tcpm_port *port)
 	if (!port->attached)
 		return;
 
+	if (port->tcpc->set_bist_data) {
+		tcpm_log(port, "disable BIST MODE TESTDATA");
+		port->tcpc->set_bist_data(port->tcpc, false);
+	}
+
 	if (tcpm_port_is_disconnected(port))
 		port->hard_reset_count = 0;
 
@@ -3555,6 +3560,12 @@ static void run_state_machine(struct tcpm_port *port)
 		case BDO_MODE_CARRIER2:
 			tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
 			break;
+		case BDO_MODE_TESTDATA:
+			if (port->tcpc->set_bist_data) {
+				tcpm_log(port, "Enable BIST MODE TESTDATA");
+				port->tcpc->set_bist_data(port->tcpc, true);
+			}
+			break;
 		default:
 			break;
 		}
diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
index e7979c01c3517c..89f58760cf4800 100644
--- a/include/linux/usb/tcpm.h
+++ b/include/linux/usb/tcpm.h
@@ -79,6 +79,7 @@ enum tcpm_transmit_type {
  * @try_role:	Optional; called to set a preferred role
  * @pd_transmit:Called to transmit PD message
  * @mux:	Pointer to multiplexer data
+ * @set_bist_data: Turn on/off bist data mode for compliance testing
  */
 struct tcpc_dev {
 	struct fwnode_handle *fwnode;
@@ -103,6 +104,7 @@ struct tcpc_dev {
 	int (*try_role)(struct tcpc_dev *dev, int role);
 	int (*pd_transmit)(struct tcpc_dev *dev, enum tcpm_transmit_type type,
 			   const struct pd_message *msg);
+	int (*set_bist_data)(struct tcpc_dev *dev, bool on);
 };
 
 struct tcpm_port;
-- 
2.27.0.389.gc38d7665816-goog