media: imx: imx7-media-csi: Move CSI configuration before source start

There's no reason to delay the CSI configuration and the DMA setup after
starting the source. Move it before, simplifying error handling at
stream start.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/imx/imx7-media-csi.c

@@ -577,15 +577,23 @@ static int imx7_csi_init(struct imx7_csi *csi)
 	ret = clk_prepare_enable(csi->mclk);
 	if (ret < 0)
 		return ret;
+
 	imx7_csi_hw_reset(csi);
 	imx7_csi_init_interface(csi);
 	imx7_csi_dmareq_rff_enable(csi);
 
+	ret = imx7_csi_dma_setup(csi);
+	if (ret < 0)
+		return ret;
+
+	imx7_csi_configure(csi);
+
 	return 0;
 }
 
 static void imx7_csi_deinit(struct imx7_csi *csi)
 {
+	imx7_csi_dma_cleanup(csi);
 	imx7_csi_hw_reset(csi);
 	imx7_csi_init_interface(csi);
 	imx7_csi_dmareq_rff_disable(csi);
@@ -612,24 +620,14 @@ static void imx7_csi_disable(struct imx7_csi *csi)
 	imx7_csi_hw_disable(csi);
 }
 
-static int imx7_csi_streaming_start(struct imx7_csi *csi)
+static void imx7_csi_streaming_start(struct imx7_csi *csi)
 {
-	int ret;
-
-	ret = imx7_csi_dma_setup(csi);
-	if (ret < 0)
-		return ret;
-
-	imx7_csi_configure(csi);
 	imx7_csi_enable(csi);
-
-	return 0;
 }
 
 static int imx7_csi_streaming_stop(struct imx7_csi *csi)
 {
 	imx7_csi_dma_stop(csi);
-	imx7_csi_dma_cleanup(csi);
 
 	imx7_csi_disable(csi);
 
@@ -769,12 +767,7 @@ static int imx7_csi_s_stream(struct v4l2_subdev *sd, int enable)
 			goto out_unlock;
 		}
 
-		ret = imx7_csi_streaming_start(csi);
-		if (ret < 0) {
-			v4l2_subdev_call(csi->src_sd, video, s_stream, 0);
-			imx7_csi_deinit(csi);
-			goto out_unlock;
-		}
+		imx7_csi_streaming_start(csi);
 	} else {
 		imx7_csi_streaming_stop(csi);