[PATCH v1 4/7] staging: media: starfive: Add multi streams for ISP

[Changhuang Liang <changhuang.liang@xxxxxxxxxxxxxxxx>]

ISP support multi streams output. Add stream_count to save the number
of stream on.

Signed-off-by: Changhuang Liang <changhuang.liang@xxxxxxxxxxxxxxxx>
---
 .../staging/media/starfive/camss/stf-isp.c    | 28 +++++++++++++------
 .../staging/media/starfive/camss/stf-isp.h    |  1 +
 2 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/media/starfive/camss/stf-isp.c b/drivers/staging/media/starfive/camss/stf-isp.c
index 9b5745669fa6..1bfd336b14a1 100644
--- a/drivers/staging/media/starfive/camss/stf-isp.c
+++ b/drivers/staging/media/starfive/camss/stf-isp.c
@@ -92,15 +92,27 @@ static int isp_set_stream(struct v4l2_subdev *sd, int enable)
 	src = stf_isp_g_index_by_mcode(fmt_t_src, fmt_src->code);
 
 	if (enable) {
-		stf_isp_reset(isp_dev);
-		stf_isp_init_cfg(isp_dev);
-		stf_isp_settings(isp_dev, crop, fmt->code);
-		stf_isp_config_yuv_out_stride(isp_dev, crop->width,
-					      fmt_t_src->fmts[src].bpp);
-		stf_isp_stream_set(isp_dev);
-	}
+		if (!isp_dev->stream_count) {
+			stf_isp_reset(isp_dev);
+			stf_isp_init_cfg(isp_dev);
+			stf_isp_settings(isp_dev, crop, fmt->code);
+			stf_isp_config_yuv_out_stride(isp_dev, crop->width,
+						      fmt_t_src->fmts[src].bpp);
+			stf_isp_stream_set(isp_dev);
+
+			v4l2_subdev_call(isp_dev->source_subdev, video,
+					 s_stream, enable);
+		}
+
+		isp_dev->stream_count++;
+	} else {
+		isp_dev->stream_count--;
 
-	v4l2_subdev_call(isp_dev->source_subdev, video, s_stream, enable);
+		if (!isp_dev->stream_count) {
+			v4l2_subdev_call(isp_dev->source_subdev, video,
+					 s_stream, enable);
+		}
+	}
 
 	v4l2_subdev_unlock_state(sd_state);
 	return 0;
diff --git a/drivers/staging/media/starfive/camss/stf-isp.h b/drivers/staging/media/starfive/camss/stf-isp.h
index 4fc5cfac115c..30e4eb29f077 100644
--- a/drivers/staging/media/starfive/camss/stf-isp.h
+++ b/drivers/staging/media/starfive/camss/stf-isp.h
@@ -414,6 +414,7 @@ struct stf_isp_dev {
 	const struct stf_isp_format_table *formats;
 	unsigned int nformats;
 	struct v4l2_subdev *source_subdev;
+	unsigned int stream_count;
 };
 
 int stf_isp_reset(struct stf_isp_dev *isp_dev);
-- 
2.25.1