Nothing currently stops the DisplayPort Alt Mode driver from sending
Enter Mode if the port is the Data Device. Utilize
typec_altmode_get_data_role to prevent mode entry.
Signed-off-by: RD Babiera <rdbabiera@google.com>
---
drivers/usb/typec/altmodes/displayport.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
index 1dcb77faf85d..8d111ad3b71b 100644
--- a/drivers/usb/typec/altmodes/displayport.c
+++ b/drivers/usb/typec/altmodes/displayport.c
@@ -758,7 +758,9 @@ int dp_altmode_probe(struct typec_altmode *alt)
struct fwnode_handle *fwnode;
struct dp_altmode *dp;
- /* FIXME: Port can only be DFP_U. */
+ /* Port can only be DFP_U. */
+ if (typec_altmode_get_data_role(alt) != TYPEC_HOST)
+ return -EPROTO;
/* Make sure we have compatible pin configurations */
if (!(DP_CAP_PIN_ASSIGN_DFP_D(port->vdo) &
--
2.51.0.534.gc79095c0ca-goog