media: sun6i-csi: Only configure capture when streaming

Add a streaming element to the capture state structure to know if the
capture device is used or not. Only configure things related to output
when streaming, including the output format, irq, state (dma buffer)
and window configuration registers.

After this change, it becomes possible to use the bridge without the
capture device, which will be the case in the isp media flow.
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_bridge.c

@@ -338,6 +338,7 @@ sun6i_csi_bridge_configure_mipi_csi2(struct sun6i_csi_device *csi_dev)
 static void sun6i_csi_bridge_configure_format(struct sun6i_csi_device *csi_dev)
 {
 	struct regmap *regmap = csi_dev->regmap;
+	bool capture_streaming = csi_dev->capture.state.streaming;
 	const struct sun6i_csi_bridge_format *bridge_format;
 	const struct sun6i_csi_capture_format *capture_format;
 	u32 mbus_code, field, pixelformat;
@@ -353,6 +354,7 @@ static void sun6i_csi_bridge_configure_format(struct sun6i_csi_device *csi_dev)
 	input_format = bridge_format->input_format;
 	input_yuv_seq = bridge_format->input_yuv_seq;
 
+	if (capture_streaming) {
 		sun6i_csi_capture_format(csi_dev, &pixelformat, NULL);
 
 		capture_format = sun6i_csi_capture_format_find(pixelformat);
@@ -373,6 +375,8 @@ static void sun6i_csi_bridge_configure_format(struct sun6i_csi_device *csi_dev)
 			output_format = capture_format->output_format_frame;
 
 		value |= SUN6I_CSI_CH_CFG_OUTPUT_FMT(output_format);
+	}
+
 	value |= SUN6I_CSI_CH_CFG_INPUT_FMT(input_format);
 	value |= SUN6I_CSI_CH_CFG_INPUT_YUV_SEQ(input_yuv_seq);
 
@@ -406,6 +410,7 @@ static int sun6i_csi_bridge_s_stream(struct v4l2_subdev *subdev, int on)
 	struct sun6i_csi_device *csi_dev = v4l2_get_subdevdata(subdev);
 	struct sun6i_csi_bridge *bridge = &csi_dev->bridge;
 	struct media_pad *local_pad = &bridge->pads[SUN6I_CSI_BRIDGE_PAD_SINK];
+	bool capture_streaming = csi_dev->capture.state.streaming;
 	struct device *dev = csi_dev->dev;
 	struct sun6i_csi_bridge_source *source;
 	struct v4l2_subdev *source_subdev;
@@ -447,15 +452,20 @@ static int sun6i_csi_bridge_s_stream(struct v4l2_subdev *subdev, int on)
 	/* Configure */
 
 	sun6i_csi_bridge_configure(csi_dev, source);
+
+	if (capture_streaming)
 		sun6i_csi_capture_configure(csi_dev);
 
 	/* State Update */
 
+	if (capture_streaming)
 		sun6i_csi_capture_state_update(csi_dev);
 
 	/* Enable */
 
+	if (capture_streaming)
 		sun6i_csi_bridge_irq_enable(csi_dev);
+
 	sun6i_csi_bridge_enable(csi_dev);
 
 	ret = v4l2_subdev_call(source_subdev, video, s_stream, 1);
@@ -465,7 +475,9 @@ static int sun6i_csi_bridge_s_stream(struct v4l2_subdev *subdev, int on)
 	return 0;
 
 disable:
+	if (capture_streaming)
 		sun6i_csi_bridge_irq_disable(csi_dev);
+
 	sun6i_csi_bridge_disable(csi_dev);
 
 	pm_runtime_put(dev);

drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_capture.c

@@ -616,13 +616,17 @@ static int sun6i_csi_capture_start_streaming(struct vb2_queue *queue,
 	if (ret < 0)
 		goto error_state;
 
+	state->streaming = true;
+
 	ret = v4l2_subdev_call(subdev, video, s_stream, 1);
 	if (ret && ret != -ENOIOCTLCMD)
-		goto error_media_pipeline;
+		goto error_streaming;
 
 	return 0;
 
-error_media_pipeline:
+error_streaming:
+	state->streaming = false;
+
 	video_device_pipeline_stop(video_dev);
 
 error_state:
@@ -634,11 +638,14 @@ static int sun6i_csi_capture_start_streaming(struct vb2_queue *queue,
 static void sun6i_csi_capture_stop_streaming(struct vb2_queue *queue)
 {
 	struct sun6i_csi_device *csi_dev = vb2_get_drv_priv(queue);
+	struct sun6i_csi_capture_state *state = &csi_dev->capture.state;
 	struct video_device *video_dev = &csi_dev->capture.video_dev;
 	struct v4l2_subdev *subdev = &csi_dev->bridge.subdev;
 
 	v4l2_subdev_call(subdev, video, s_stream, 0);
 
+	state->streaming = false;
+
 	video_device_pipeline_stop(video_dev);
 
 	sun6i_csi_capture_state_cleanup(csi_dev, true);

drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_capture.h

@@ -44,6 +44,7 @@ struct sun6i_csi_capture_state {
 	struct sun6i_csi_buffer		*complete;
 
 	unsigned int			sequence;
+	bool				streaming;
 };
 
 struct sun6i_csi_capture {