greybus: camera-gb: Extend the configure streams interface

Extending the configure streams interface with CSI params.
Getting CSI frequency data form configure streams response.
 * num_lanes - Number of CSI data lanes
 * clk_freq - CSI clock frequency in Hz
 * lines_per_second - Total number of lines in a second of
transmission (blanking included)

From the AP side we need to know for the CSI speed
configuration. This information is needed for dynamically
bandwidth calculations.

NOTE: Change should be along merged with corresponding
      interface change in kernel:
      "camera: Extend the configure streams
      interface with CSI params"
Signed-off-by: Evgeniy Borisov <eborisov@mm-sol.com>
Reviewed-by: Gjorgji Rosikopulos <grosikopulos@mm-sol.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/camera.c

@@ -203,7 +203,8 @@ struct ap_csi_config_request {
 static int gb_camera_configure_streams(struct gb_camera *gcam,
 				       unsigned int *num_streams,
 				       unsigned int *flags,
-				       struct gb_camera_stream_config *streams)
+				       struct gb_camera_stream_config *streams,
+				       struct gb_camera_csi_params *csi_params)
 {
 	struct gb_camera_configure_streams_request *req;
 	struct gb_camera_configure_streams_response *resp;
@@ -309,6 +310,12 @@ static int gb_camera_configure_streams(struct gb_camera *gcam,
 		ret = gb_hd_output(gcam->connection->hd, &csi_cfg,
 				   sizeof(csi_cfg),
 				   GB_APB_REQUEST_CSI_TX_CONTROL, false);
+		if (csi_params) {
+			csi_params->num_lanes = csi_cfg.num_lanes;
+			/* Transmitting two bits per cycle. (DDR clock) */
+			csi_params->clk_freq = csi_cfg.bus_freq / 2;
+			csi_params->lines_per_second = csi_cfg.lines_per_second;
+		}
 	} else {
 		csi_cfg.csi_id = 1;
 		ret = gb_hd_output(gcam->connection->hd, &csi_cfg,
@@ -442,7 +449,8 @@ static ssize_t gb_camera_op_capabilities(void *priv, char *data, size_t len)
 }
 
 static int gb_camera_op_configure_streams(void *priv, unsigned int *nstreams,
-		unsigned int *flags, struct gb_camera_stream *streams)
+		unsigned int *flags, struct gb_camera_stream *streams,
+		struct gb_camera_csi_params *csi_params)
 {
 	struct gb_camera *gcam = priv;
 	struct gb_camera_stream_config *gb_streams;
@@ -469,7 +477,7 @@ static int gb_camera_op_configure_streams(void *priv, unsigned int *nstreams,
 		gb_flags |= GB_CAMERA_CONFIGURE_STREAMS_TEST_ONLY;
 
 	ret = gb_camera_configure_streams(gcam, &gb_nstreams,
-					  &gb_flags, gb_streams);
+					  &gb_flags, gb_streams, csi_params);
 	if (ret < 0)
 		goto done;
 	if (gb_nstreams > *nstreams) {
@@ -643,7 +651,8 @@ static ssize_t gb_camera_debugfs_configure_streams(struct gb_camera *gcam,
 			goto done;
 	}
 
-	ret = gb_camera_configure_streams(gcam, &nstreams, &flags, streams);
+	ret = gb_camera_configure_streams(gcam, &nstreams, &flags, streams,
+					  NULL);
 	if (ret < 0)
 		goto done;
 

drivers/staging/greybus/gb-camera.h

@@ -24,10 +24,24 @@ struct gb_camera_stream {
 	unsigned int max_size;
 };
 
+/**
+ * struct gb_camera_csi_params - CSI configuration parameters
+ * @num_lanes:		number of CSI data lanes
+ * @clk_freq:		CSI clock frequency in Hz
+ * @lines_per_second:	total number of lines in a second of transmission
+ *			(blanking included)
+ */
+struct gb_camera_csi_params {
+	unsigned int num_lanes;
+	unsigned int clk_freq;
+	unsigned int lines_per_second;
+};
+
 struct gb_camera_ops {
 	ssize_t (*capabilities)(void *priv, char *buf, size_t len);
 	int (*configure_streams)(void *priv, unsigned int *nstreams,
-			unsigned int *flags, struct gb_camera_stream *streams);
+			unsigned int *flags, struct gb_camera_stream *streams,
+			struct gb_camera_csi_params *csi_params);
 	int (*capture)(void *priv, u32 request_id,
 			unsigned int streams, unsigned int num_frames,
 			size_t settings_size, const void *settings);