usb: typec: displayport: Reduce noise from the driver

It's not an error if the mode can't be entered because
another mode is already active, so no longer printing an
error message if that happens.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20200928133324.48841-1-heikki.krogerus@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/altmodes/displayport.c

@@ -190,7 +190,7 @@ static void dp_altmode_work(struct work_struct *work)
 	switch (dp->state) {
 	case DP_STATE_ENTER:
 		ret = typec_altmode_enter(dp->alt, NULL);
-		if (ret)
+		if (ret && ret != -EBUSY)
 			dev_err(&dp->alt->dev, "failed to enter mode\n");
 		break;
 	case DP_STATE_UPDATE: