[PATCH] media: i2c: ub960: clarify stream_enable_mask indexing

[Cosmin Tanislav <demonsingur@gmail.com>]

Variables containing port numbers are used to index
arrays which should be indexed by pad numbers.
Coincidentally, the order in which pad numbers are
assigned makes it avoid any conflicts, but it's still
confusing.

Clarify the situation by adding port_to_pad helpers
and using them.

Signed-off-by: Cosmin Tanislav <demonsingur@gmail.com>
---
 drivers/media/i2c/ds90ub960.c | 41 +++++++++++++++++++++++++----------
 1 file changed, 30 insertions(+), 11 deletions(-)

diff --git a/drivers/media/i2c/ds90ub960.c b/drivers/media/i2c/ds90ub960.c
index ffe5f25f86476..d1595c88f7632 100644
--- a/drivers/media/i2c/ds90ub960.c
+++ b/drivers/media/i2c/ds90ub960.c
@@ -527,6 +527,7 @@ struct ub960_data {
 
 	u8 stored_fwd_ctl;
 
+	/* Indexed by pad number */
 	u64 stream_enable_mask[UB960_MAX_NPORTS];
 
 	/* These are common to all ports */
@@ -561,6 +562,16 @@ static inline unsigned int ub960_pad_to_port(struct ub960_data *priv, u32 pad)
 		return pad - priv->hw_data->num_rxports;
 }
 
+static inline unsigned int ub960_rxport_to_pad(struct ub960_data *priv, u32 port)
+{
+	return port;
+}
+
+static inline unsigned int ub960_txport_to_pad(struct ub960_data *priv, u32 port)
+{
+	return port + priv->hw_data->num_rxports;
+}
+
 struct ub960_format_info {
 	u32 code;
 	u32 bpp;
@@ -2558,6 +2569,7 @@ static int ub960_enable_streams(struct v4l2_subdev *sd,
 {
 	struct ub960_data *priv = sd_to_ub960(sd);
 	struct device *dev = &priv->client->dev;
+	/* Indexed by rx port number */
 	u64 sink_streams[UB960_MAX_RX_NPORTS] = {};
 	struct v4l2_subdev_route *route;
 	unsigned int failed_port;
@@ -2595,11 +2607,13 @@ static int ub960_enable_streams(struct v4l2_subdev *sd,
 	}
 
 	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		unsigned int sink_pad = ub960_rxport_to_pad(priv, nport);
+
 		if (!sink_streams[nport])
 			continue;
 
 		/* Enable the RX port if not yet enabled */
-		if (!priv->stream_enable_mask[nport]) {
+		if (!priv->stream_enable_mask[sink_pad]) {
 			ret = ub960_enable_rx_port(priv, nport);
 			if (ret) {
 				failed_port = nport;
@@ -2607,7 +2621,7 @@ static int ub960_enable_streams(struct v4l2_subdev *sd,
 			}
 		}
 
-		priv->stream_enable_mask[nport] |= sink_streams[nport];
+		priv->stream_enable_mask[sink_pad] |= sink_streams[nport];
 
 		dev_dbg(dev, "enable RX port %u streams %#llx\n", nport,
 			sink_streams[nport]);
@@ -2617,9 +2631,9 @@ static int ub960_enable_streams(struct v4l2_subdev *sd,
 			priv->rxports[nport]->source.pad,
 			sink_streams[nport]);
 		if (ret) {
-			priv->stream_enable_mask[nport] &= ~sink_streams[nport];
+			priv->stream_enable_mask[sink_pad] &= ~sink_streams[nport];
 
-			if (!priv->stream_enable_mask[nport])
+			if (!priv->stream_enable_mask[sink_pad])
 				ub960_disable_rx_port(priv, nport);
 
 			failed_port = nport;
@@ -2633,6 +2647,8 @@ static int ub960_enable_streams(struct v4l2_subdev *sd,
 
 err:
 	for (nport = 0; nport < failed_port; nport++) {
+		unsigned int sink_pad = ub960_rxport_to_pad(priv, nport);
+
 		if (!sink_streams[nport])
 			continue;
 
@@ -2646,10 +2662,10 @@ static int ub960_enable_streams(struct v4l2_subdev *sd,
 		if (ret)
 			dev_err(dev, "Failed to disable streams: %d\n", ret);
 
-		priv->stream_enable_mask[nport] &= ~sink_streams[nport];
+		priv->stream_enable_mask[sink_pad] &= ~sink_streams[nport];
 
 		/* Disable RX port if no active streams */
-		if (!priv->stream_enable_mask[nport])
+		if (!priv->stream_enable_mask[sink_pad])
 			ub960_disable_rx_port(priv, nport);
 	}
 
@@ -2689,6 +2705,8 @@ static int ub960_disable_streams(struct v4l2_subdev *sd,
 	}
 
 	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		unsigned int sink_pad = ub960_rxport_to_pad(priv, nport);
+
 		if (!sink_streams[nport])
 			continue;
 
@@ -2702,10 +2720,10 @@ static int ub960_disable_streams(struct v4l2_subdev *sd,
 		if (ret)
 			dev_err(dev, "Failed to disable streams: %d\n", ret);
 
-		priv->stream_enable_mask[nport] &= ~sink_streams[nport];
+		priv->stream_enable_mask[sink_pad] &= ~sink_streams[nport];
 
 		/* Disable RX port if no active streams */
-		if (!priv->stream_enable_mask[nport])
+		if (!priv->stream_enable_mask[sink_pad])
 			ub960_disable_rx_port(priv, nport);
 	}
 
@@ -3460,6 +3478,7 @@ static int ub960_parse_dt_rxports(struct ub960_data *priv)
 	priv->strobe.manual = fwnode_property_read_bool(links_fwnode, "ti,manual-strobe");
 
 	for (nport = 0; nport < priv->hw_data->num_rxports; nport++) {
+		unsigned int pad = ub960_rxport_to_pad(priv, nport);
 		struct fwnode_handle *link_fwnode;
 		struct fwnode_handle *ep_fwnode;
 
@@ -3468,7 +3487,7 @@ static int ub960_parse_dt_rxports(struct ub960_data *priv)
 			continue;
 
 		ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
-							    nport, 0, 0);
+							    pad, 0, 0);
 		if (!ep_fwnode) {
 			fwnode_handle_put(link_fwnode);
 			continue;
@@ -3503,11 +3522,11 @@ static int ub960_parse_dt_txports(struct ub960_data *priv)
 	int ret;
 
 	for (nport = 0; nport < priv->hw_data->num_txports; nport++) {
-		unsigned int port = nport + priv->hw_data->num_rxports;
+		unsigned int pad = ub960_txport_to_pad(priv, nport);
 		struct fwnode_handle *ep_fwnode;
 
 		ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev),
-							    port, 0, 0);
+							    pad, 0, 0);
 		if (!ep_fwnode)
 			continue;
 
-- 
2.46.1