usb: typec: tcpci_maxim: Enable data path when partner is USB Comm capable

Configure USB switches when partner is USB Communication capable.
The is enabled USB data communication over D+/D- pins.
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Link: https://lore.kernel.org/r/20210202003101.221145-3-badhri@google.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/tcpm/tcpci_maxim.c

@@ -19,6 +19,9 @@
 #define PD_ACTIVITY_TIMEOUT_MS				10000
 
 #define TCPC_VENDOR_ALERT				0x80
+#define TCPC_VENDOR_USBSW_CTRL				0x93
+#define TCPC_VENDOR_USBSW_CTRL_ENABLE_USB_DATA		0x9
+#define TCPC_VENDOR_USBSW_CTRL_DISABLE_USB_DATA		0
 
 #define TCPC_RECEIVE_BUFFER_COUNT_OFFSET		0
 #define TCPC_RECEIVE_BUFFER_FRAME_TYPE_OFFSET		1
@@ -274,6 +277,21 @@ static void process_tx(struct max_tcpci_chip *chip, u16 status)
 		max_tcpci_init_regs(chip);
 }
 
+/* Enable USB switches when partner is USB communications capable */
+static void max_tcpci_set_partner_usb_comm_capable(struct tcpci *tcpci, struct tcpci_data *data,
+						   bool capable)
+{
+	struct max_tcpci_chip *chip = tdata_to_max_tcpci(data);
+	int ret;
+
+	ret = max_tcpci_write8(chip, TCPC_VENDOR_USBSW_CTRL, capable ?
+			       TCPC_VENDOR_USBSW_CTRL_ENABLE_USB_DATA :
+			       TCPC_VENDOR_USBSW_CTRL_DISABLE_USB_DATA);
+
+	if (ret < 0)
+		dev_err(chip->dev, "Failed to enable USB switches");
+}
+
 static irqreturn_t _max_tcpci_irq(struct max_tcpci_chip *chip, u16 status)
 {
 	u16 mask;
@@ -453,6 +471,7 @@ static int max_tcpci_probe(struct i2c_client *client, const struct i2c_device_id
 	chip->data.frs_sourcing_vbus = max_tcpci_frs_sourcing_vbus;
 	chip->data.auto_discharge_disconnect = true;
 	chip->data.vbus_vsafe0v = true;
+	chip->data.set_partner_usb_comm_capable = max_tcpci_set_partner_usb_comm_capable;
 
 	max_tcpci_init_regs(chip);
 	chip->tcpci = tcpci_register_port(chip->dev, &chip->data);