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Date:   Tue, 14 Jul 2020 16:12:05 -0700
Message-Id: <20200714231207.866838-1-badhri@google.com>
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Subject: [PATCH 1/3 v2] usb: typec: tcpci: Support BIST test data mode for compliance.
From:   Badhri Jagan Sridharan <badhri@google.com>
To:     Guenter Roeck <linux@roeck-us.net>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        reg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
        Badhri Jagan Sridharan <badhri@google.com>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
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Quoting from TCPCI spec:
"Setting this bit to 1 is intended to be used only when a USB compliance
tester is using USB BIST Test Data to test the PHY layer of the TCPC. The
TCPM should clear this bit when a disconnect is detected.
0: Normal Operation. Incoming messages enabled by RECEIVE_DETECT
passed to TCPM via Alert.
1: BIST Test Mode. Incoming messages enabled by RECEIVE_DETECT
result in GoodCRC response but may not be passed to the TCPM via
Alert."

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
---
Version history:
Changes since V1:(Guenter's suggestions)
- Split the change into two: TCPM and TCPCI
- Move BIST log to TCPM log
- Alignment and column count changes
---
 drivers/usb/typec/tcpm/tcpci.c | 9 +++++++++
 drivers/usb/typec/tcpm/tcpci.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
index 753645bb25273a..f57d91fd0e0924 100644
--- a/drivers/usb/typec/tcpm/tcpci.c
+++ b/drivers/usb/typec/tcpm/tcpci.c
@@ -227,6 +227,14 @@ static int tcpci_set_vconn(struct tcpc_dev *tcpc, bool enable)
 				enable ? TCPC_POWER_CTRL_VCONN_ENABLE : 0);
 }
 
+static int tcpci_set_bist_data(struct tcpc_dev *tcpc, bool enable)
+{
+	struct tcpci *tcpci = tcpc_to_tcpci(tcpc);
+
+	return regmap_update_bits(tcpci->regmap, TCPC_TCPC_CTRL, TCPC_TCPC_CTRL_BIST_TM,
+				 enable ? TCPC_TCPC_CTRL_BIST_TM : 0);
+}
+
 static int tcpci_set_roles(struct tcpc_dev *tcpc, bool attached,
 			   enum typec_role role, enum typec_data_role data)
 {
@@ -530,6 +538,7 @@ struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data)
 	tcpci->tcpc.set_pd_rx = tcpci_set_pd_rx;
 	tcpci->tcpc.set_roles = tcpci_set_roles;
 	tcpci->tcpc.pd_transmit = tcpci_pd_transmit;
+	tcpci->tcpc.set_bist_data = tcpci_set_bist_data;
 
 	err = tcpci_parse_config(tcpci);
 	if (err < 0)
diff --git a/drivers/usb/typec/tcpm/tcpci.h b/drivers/usb/typec/tcpm/tcpci.h
index 303ebde265465c..11c36d086c8608 100644
--- a/drivers/usb/typec/tcpm/tcpci.h
+++ b/drivers/usb/typec/tcpm/tcpci.h
@@ -36,6 +36,7 @@
 
 #define TCPC_TCPC_CTRL			0x19
 #define TCPC_TCPC_CTRL_ORIENTATION	BIT(0)
+#define TCPC_TCPC_CTRL_BIST_TM		BIT(1)
 
 #define TCPC_ROLE_CTRL			0x1a
 #define TCPC_ROLE_CTRL_DRP		BIT(6)
-- 
2.27.0.389.gc38d7665816-goog