usb: typec: ucsi: Ack unsupported commands

If a command completes the OPM must send an ack. This applies
to unsupported commands, too.

Send the required ACK for unsupported commands.

Signed-off-by: Christian A. Ehrhardt <[email protected]>
Cc: stable <[email protected]>
Reviewed-by: Heikki Krogerus <[email protected]>
Tested-by: Neil Armstrong <[email protected]> # on SM8550-QRD
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Christian A. Ehrhardt

drivers/usb/typec/ucsi/ucsi.c

@@ -151,8 +151,12 @@ static int ucsi_exec_command(struct ucsi *ucsi, u64 cmd)
 	if (!(cci & UCSI_CCI_COMMAND_COMPLETE))
 		return -EIO;
 
-	if (cci & UCSI_CCI_NOT_SUPPORTED)
+	if (cci & UCSI_CCI_NOT_SUPPORTED) {
+		if (ucsi_acknowledge_command(ucsi) < 0)
+			dev_err(ucsi->dev,
+				"ACK of unsupported command failed\n");
 		return -EOPNOTSUPP;
+	}
 
 	if (cci & UCSI_CCI_ERROR) {
 		if (cmd == UCSI_GET_ERROR_STATUS)