usb: typec: ucsi: Never send a lone connector change ack

Some PPM implementation do not like UCSI_ACK_CONNECTOR_CHANGE
without UCSI_ACK_COMMAND_COMPLETE. Moreover, doing this is racy
as it requires sending two UCSI_ACK_CC_CI commands in a row and
the second one will be started with UCSI_CCI_ACK_COMPLETE already
set in CCI.

Bundle the UCSI_ACK_CONNECTOR_CHANGE with the UCSI_ACK_COMMAND_COMPLETE
for the UCSI_GET_CONNECTOR_STATUS command that is sent while
handling a connector change event.
Signed-off-by: Christian A. Ehrhardt <lk@c--e.de>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240327224554.1772525-3-lk@c--e.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/ucsi/ucsi.c

@@ -49,22 +49,16 @@ static int ucsi_read_message_in(struct ucsi *ucsi, void *buf,
 	return ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, buf, buf_size);
 }
 
-static int ucsi_acknowledge_command(struct ucsi *ucsi)
+static int ucsi_acknowledge(struct ucsi *ucsi, bool conn_ack)
 {
 	u64 ctrl;
 
 	ctrl = UCSI_ACK_CC_CI;
 	ctrl |= UCSI_ACK_COMMAND_COMPLETE;
-
-	return ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl));
-}
-
-static int ucsi_acknowledge_connector_change(struct ucsi *ucsi)
-{
-	u64 ctrl;
-
-	ctrl = UCSI_ACK_CC_CI;
-	ctrl |= UCSI_ACK_CONNECTOR_CHANGE;
+	if (conn_ack) {
+		clear_bit(EVENT_PENDING, &ucsi->flags);
+		ctrl |= UCSI_ACK_CONNECTOR_CHANGE;
+	}
 
 	return ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl));
 }
@@ -77,7 +71,7 @@ static int ucsi_read_error(struct ucsi *ucsi)
 	int ret;
 
 	/* Acknowledge the command that failed */
-	ret = ucsi_acknowledge_command(ucsi);
+	ret = ucsi_acknowledge(ucsi, false);
 	if (ret)
 		return ret;
 
@@ -89,7 +83,7 @@ static int ucsi_read_error(struct ucsi *ucsi)
 	if (ret)
 		return ret;
 
-	ret = ucsi_acknowledge_command(ucsi);
+	ret = ucsi_acknowledge(ucsi, false);
 	if (ret)
 		return ret;
 
@@ -152,7 +146,7 @@ static int ucsi_exec_command(struct ucsi *ucsi, u64 cmd)
 		return -EIO;
 
 	if (cci & UCSI_CCI_NOT_SUPPORTED) {
-		if (ucsi_acknowledge_command(ucsi) < 0)
+		if (ucsi_acknowledge(ucsi, false) < 0)
 			dev_err(ucsi->dev,
 				"ACK of unsupported command failed\n");
 		return -EOPNOTSUPP;
@@ -165,15 +159,15 @@ static int ucsi_exec_command(struct ucsi *ucsi, u64 cmd)
 	}
 
 	if (cmd == UCSI_CANCEL && cci & UCSI_CCI_CANCEL_COMPLETE) {
-		ret = ucsi_acknowledge_command(ucsi);
+		ret = ucsi_acknowledge(ucsi, false);
 		return ret ? ret : -EBUSY;
 	}
 
 	return UCSI_CCI_LENGTH(cci);
 }
 
-int ucsi_send_command(struct ucsi *ucsi, u64 command,
-		      void *data, size_t size)
+static int ucsi_send_command_common(struct ucsi *ucsi, u64 command,
+				    void *data, size_t size, bool conn_ack)
 {
 	u8 length;
 	int ret;
@@ -192,7 +186,7 @@ int ucsi_send_command(struct ucsi *ucsi, u64 command,
 			goto out;
 	}
 
-	ret = ucsi_acknowledge_command(ucsi);
+	ret = ucsi_acknowledge(ucsi, conn_ack);
 	if (ret)
 		goto out;
 
@@ -201,6 +195,12 @@ int ucsi_send_command(struct ucsi *ucsi, u64 command,
 	mutex_unlock(&ucsi->ppm_lock);
 	return ret;
 }
+
+int ucsi_send_command(struct ucsi *ucsi, u64 command,
+		      void *data, size_t size)
+{
+	return ucsi_send_command_common(ucsi, command, data, size, false);
+}
 EXPORT_SYMBOL_GPL(ucsi_send_command);
 
 /* -------------------------------------------------------------------------- */
@@ -1187,7 +1187,9 @@ static void ucsi_handle_connector_change(struct work_struct *work)
 	mutex_lock(&con->lock);
 
 	command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num);
-	ret = ucsi_send_command(ucsi, command, &con->status, sizeof(con->status));
+
+	ret = ucsi_send_command_common(ucsi, command, &con->status,
+				       sizeof(con->status), true);
 	if (ret < 0) {
 		dev_err(ucsi->dev, "%s: GET_CONNECTOR_STATUS failed (%d)\n",
 			__func__, ret);
@@ -1244,14 +1246,6 @@ static void ucsi_handle_connector_change(struct work_struct *work)
 	if (con->status.change & UCSI_CONSTAT_CAM_CHANGE)
 		ucsi_partner_task(con, ucsi_check_altmodes, 1, 0);
 
-	mutex_lock(&ucsi->ppm_lock);
-	clear_bit(EVENT_PENDING, &con->ucsi->flags);
-	ret = ucsi_acknowledge_connector_change(ucsi);
-	mutex_unlock(&ucsi->ppm_lock);
-
-	if (ret)
-		dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret);
-
 out_unlock:
 	mutex_unlock(&con->lock);
 }