[PATCH] usb: typec: tcpci: allow drp toggling for non-drp port

[Xu Yang <xu.yang_2@nxp.com>]

Some single power role Type-C port with dual data role, this kind of
port connects non Type-C port for usb data will need tcpm to work to
get polarity for orientation change and let Type-C port keep at fake
power role to provide another non-default data role, so remove the drp
port condition for now.

Has anyone encountered this use case? How do you handle this limitation
in current tcpm with a better way? Please kindly share your thoughts.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Signed-off-by: Li Jun <jun.li@nxp.com>
---
 drivers/usb/typec/tcpm/tcpci.c | 3 ---
 drivers/usb/typec/tcpm/tcpm.c  | 6 +++++-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
index fc708c289a73..88559e749120 100644
--- a/drivers/usb/typec/tcpm/tcpci.c
+++ b/drivers/usb/typec/tcpm/tcpci.c
@@ -175,9 +175,6 @@ static int tcpci_start_toggling(struct tcpc_dev *tcpc,
 	struct tcpci *tcpci = tcpc_to_tcpci(tcpc);
 	unsigned int reg = TCPC_ROLE_CTRL_DRP;
 
-	if (port_type != TYPEC_PORT_DRP)
-		return -EOPNOTSUPP;
-
 	/* Handle vendor drp toggling */
 	if (tcpci->data->start_drp_toggling) {
 		ret = tcpci->data->start_drp_toggling(tcpci, tcpci->data, cc);
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 3c6b0c8e2d3a..6aa62132e69a 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -4274,7 +4274,11 @@ static void run_state_machine(struct tcpm_port *port)
 		ret = tcpm_snk_attach(port);
 		if (ret < 0)
 			tcpm_set_state(port, SNK_UNATTACHED, 0);
-		else
+		else if (port->port_type == TYPEC_PORT_SRC &&
+			 port->typec_caps.data == TYPEC_PORT_DRD) {
+			tcpm_typec_connect(port);
+			tcpm_log(port, "Keep at SNK_ATTACHED for USB data.");
+		} else
 			tcpm_set_state(port, SNK_STARTUP, 0);
 		break;
 	case SNK_STARTUP:
-- 
2.34.1