[PATCH v2 13/15] media: vimc: sca: Add support for multiplanar formats

["André Almeida" <andrealmeid@collabora.com>]

Change the scaling functions in order to scale planes. This change makes
easier to support multiplanar pixel formats.

Signed-off-by: André Almeida <andrealmeid@collabora.com>
---
Changes in v2:
- Move the TODO comment to vimc-capture
- Reuse and share the code to free the memory of planes with a goto
- Fix comment block style 

 drivers/media/platform/vimc/vimc-scaler.c | 113 ++++++++++++++--------
 1 file changed, 71 insertions(+), 42 deletions(-)

diff --git a/drivers/media/platform/vimc/vimc-scaler.c b/drivers/media/platform/vimc/vimc-scaler.c
index 92c639f1817e..46fb4a98f731 100644
--- a/drivers/media/platform/vimc/vimc-scaler.c
+++ b/drivers/media/platform/vimc/vimc-scaler.c
@@ -39,6 +39,9 @@ static const u32 vimc_sca_supported_pixfmt[] = {
 	V4L2_PIX_FMT_BGR24,
 	V4L2_PIX_FMT_RGB24,
 	V4L2_PIX_FMT_ARGB32,
+	V4L2_PIX_FMT_YUV420,
+	V4L2_PIX_FMT_YUV420M,
+	V4L2_PIX_FMT_NV12M,
 };
 
 struct vimc_sca_device {
@@ -51,8 +54,8 @@ struct vimc_sca_device {
 	struct v4l2_mbus_framefmt sink_fmt;
 	/* Values calculated when the stream starts */
 	struct vimc_frame src_frame;
-	unsigned int src_line_size;
-	unsigned int bpp;
+	unsigned int src_line_size[TPG_MAX_PLANES];
+	unsigned int bpp[TPG_MAX_PLANES];
 };
 
 static const struct v4l2_mbus_framefmt sink_fmt_default = {
@@ -207,10 +210,10 @@ static const struct v4l2_subdev_pad_ops vimc_sca_pad_ops = {
 static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
 {
 	struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
+	unsigned int i, ret = 0;
 
 	if (enable) {
 		u32 pixelformat = vsca->ved.stream->producer_pixfmt;
-		const struct v4l2_format_info *pix_info;
 		unsigned int frame_size;
 
 		if (!vimc_sca_is_pixfmt_supported(pixelformat)) {
@@ -219,35 +222,46 @@ static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
 			return -EINVAL;
 		}
 
-		/* Save the bytes per pixel of the sink */
-		pix_info = v4l2_format_info(pixelformat);
-		vsca->bpp = pix_info->bpp[0];
-
-		/* Calculate the width in bytes of the src frame */
-		vsca->src_line_size = vsca->sink_fmt.width *
-				      sca_mult * vsca->bpp;
-
-		/* Calculate the frame size of the source pad */
-		frame_size = vsca->src_line_size * vsca->sink_fmt.height *
-			     sca_mult;
-
-		/* Allocate the frame buffer. Use vmalloc to be able to
-		 * allocate a large amount of memory
-		 */
-		vsca->src_frame.plane_addr[0] = vmalloc(frame_size);
-		vsca->src_frame.sizeimage[0] = frame_size;
-		if (!vsca->src_frame.plane_addr[0])
-			return -ENOMEM;
+		vimc_fill_frame(&vsca->src_frame, pixelformat,
+				vsca->sink_fmt.width, vsca->sink_fmt.height,
+				vsca->ved.stream->multiplanar);
+
+		for (i = 0; i < vsca->src_frame.num_planes; i++) {
+			/* Save the bytes per pixel of the sink */
+			vsca->bpp[i] = vsca->src_frame.bpp[i];
+
+			/* Calculate the width in bytes of the src frame */
+			vsca->src_line_size[i] =
+				vsca->src_frame.bytesperline[i] * sca_mult;
+
+			/* Calculate the frame size of the source pad */
+			frame_size = vsca->src_frame.sizeimage[i] *
+			     sca_mult * sca_mult;
+
+			/**
+			 * Allocate the frame buffer. Use vmalloc to be able to
+			 * allocate a large amount of memory
+			 */
+			vsca->src_frame.plane_addr[i] = vmalloc(frame_size);
+			if (!vsca->src_frame.plane_addr[i]) {
+				ret = -ENOMEM;
+				goto free_planes;
+			}
+			vsca->src_frame.sizeimage[i] = frame_size;
+		}
 
 	} else {
 		if (!vsca->src_frame.plane_addr[0])
 			return 0;
 
-		vfree(vsca->src_frame.plane_addr[0]);
-		vsca->src_frame.plane_addr[0] = NULL;
+free_planes:
+		for (i = 0; i < vsca->src_frame.num_planes; i++) {
+			vfree(vsca->src_frame.plane_addr[i]);
+			vsca->src_frame.plane_addr[i] = NULL;
+		}
 	}
 
-	return 0;
+	return ret;
 }
 
 static const struct v4l2_subdev_video_ops vimc_sca_video_ops = {
@@ -270,18 +284,19 @@ static void vimc_sca_fill_pix(u8 *const ptr,
 		ptr[i] = pixel[i];
 }
 
-static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
+/* TODO: parallelize this function */
+static void vimc_sca_scale_plane(const struct vimc_sca_device *const vsca,
 			       const unsigned int lin, const unsigned int col,
-			       const u8 *const sink_frame)
+			       const struct vimc_frame *sink_frame,
+			       u8 num_plane, u32 width)
+
 {
 	unsigned int i, j, index;
 	const u8 *pixel;
 
 	/* Point to the pixel value in position (lin, col) in the sink frame */
-	index = VIMC_FRAME_INDEX(lin, col,
-				 vsca->sink_fmt.width,
-				 vsca->bpp);
-	pixel = &sink_frame[index];
+	index = VIMC_FRAME_INDEX(lin, col, width, vsca->bpp[num_plane]);
+	pixel = &sink_frame->plane_addr[num_plane][index];
 
 	dev_dbg(vsca->dev,
 		"sca: %s: --- scale_pix sink pos %dx%d, index %d ---\n",
@@ -291,7 +306,7 @@ static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
 	 * in the scaled src frame
 	 */
 	index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
-				 vsca->sink_fmt.width * sca_mult, vsca->bpp);
+				 width * sca_mult, vsca->bpp[num_plane]);
 
 	dev_dbg(vsca->dev, "sca: %s: scale_pix src pos %dx%d, index %d\n",
 		vsca->sd.name, lin * sca_mult, col * sca_mult, index);
@@ -301,32 +316,46 @@ static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
 		/* Iterate through each beginning of a
 		 * pixel repetition in a line
 		 */
-		for (j = 0; j < sca_mult * vsca->bpp; j += vsca->bpp) {
+		unsigned int bpp = vsca->bpp[num_plane];
+
+		for (j = 0; j < sca_mult * bpp; j += bpp) {
 			dev_dbg(vsca->dev,
 				"sca: %s: sca: scale_pix src pos %d\n",
 				vsca->sd.name, index + j);
 
 			/* copy the pixel to the position index + j */
 			vimc_sca_fill_pix(
-				&vsca->src_frame.plane_addr[0][index + j],
-				pixel, vsca->bpp);
+				&vsca->src_frame.plane_addr[num_plane][index+j],
+				pixel, bpp);
 		}
 
 		/* move the index to the next line */
-		index += vsca->src_line_size;
+		index += vsca->src_line_size[num_plane];
 	}
 }
 
 static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
-				    const u8 *const sink_frame)
+				    const struct vimc_frame *sink_frame)
 {
-	unsigned int i, j;
+	u32 i, j, width, height;
+	unsigned int num_plane;
+	const struct v4l2_format_info *info;
+
+	info = v4l2_format_info(sink_frame->pixelformat);
 
 	/* Scale each pixel from the original sink frame */
 	/* TODO: implement scale down, only scale up is supported for now */
-	for (i = 0; i < vsca->sink_fmt.height; i++)
-		for (j = 0; j < vsca->sink_fmt.width; j++)
-			vimc_sca_scale_pix(vsca, i, j, sink_frame);
+	for (num_plane = 0; num_plane < info->comp_planes; num_plane++) {
+		width = vsca->sink_fmt.width /
+					((num_plane == 0) ? 1 : info->vdiv);
+		height = vsca->sink_fmt.height /
+					((num_plane == 0) ? 1 : info->hdiv);
+
+		for (i = 0; i < height; i++)
+			for (j = 0; j < width; j++)
+				vimc_sca_scale_plane(vsca, i, j, sink_frame,
+						     num_plane, width);
+	}
 }
 
 static struct vimc_frame *vimc_sca_process_frame(struct vimc_ent_device *ved,
@@ -339,7 +368,7 @@ static struct vimc_frame *vimc_sca_process_frame(struct vimc_ent_device *ved,
 	if (!ved->stream)
 		return ERR_PTR(-EINVAL);
 
-	vimc_sca_fill_src_frame(vsca, sink_frame->plane_addr[0]);
+	vimc_sca_fill_src_frame(vsca, sink_frame);
 
 	return &vsca->src_frame;
 };
-- 
2.21.0