media: camss: vfe: Add interface for scaling

Add compose selection ioctls to handle scaling configuration.
Signed-off-by: Todor Tomov <todor.tomov@linaro.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/qcom/camss-8x16/camss-vfe.c

@@ -232,6 +232,8 @@
 #define CAMIF_TIMEOUT_SLEEP_US 1000
 #define CAMIF_TIMEOUT_ALL_US 1000000
 
+#define SCALER_RATIO_MAX 16
+
 static const u32 vfe_formats[] = {
 	MEDIA_BUS_FMT_UYVY8_2X8,
 	MEDIA_BUS_FMT_VYUY8_2X8,
@@ -1938,6 +1940,25 @@ __vfe_get_format(struct vfe_line *line,
 	return &line->fmt[pad];
 }
 
+/*
+ * __vfe_get_compose - Get pointer to compose selection structure
+ * @line: VFE line
+ * @cfg: V4L2 subdev pad configuration
+ * @which: TRY or ACTIVE format
+ *
+ * Return pointer to TRY or ACTIVE compose rectangle structure
+ */
+static struct v4l2_rect *
+__vfe_get_compose(struct vfe_line *line,
+		  struct v4l2_subdev_pad_config *cfg,
+		  enum v4l2_subdev_format_whence which)
+{
+	if (which == V4L2_SUBDEV_FORMAT_TRY)
+		return v4l2_subdev_get_try_compose(&line->subdev, cfg,
+						   MSM_VFE_PAD_SINK);
+
+	return &line->compose;
+}
 
 /*
  * vfe_try_format - Handle try format by pad subdev method
@@ -1984,7 +2005,14 @@ static void vfe_try_format(struct vfe_line *line,
 		*fmt = *__vfe_get_format(line, cfg, MSM_VFE_PAD_SINK,
 					 which);
 
-		if (line->id == VFE_LINE_PIX)
+		if (line->id == VFE_LINE_PIX) {
+			struct v4l2_rect *rect;
+
+			rect = __vfe_get_compose(line, cfg, which);
+
+			fmt->width = rect->width;
+			fmt->height = rect->height;
+
 			switch (fmt->code) {
 			case MEDIA_BUS_FMT_YUYV8_2X8:
 				if (code == MEDIA_BUS_FMT_YUYV8_1_5X8)
@@ -2012,6 +2040,7 @@ static void vfe_try_format(struct vfe_line *line,
 					fmt->code = MEDIA_BUS_FMT_VYUY8_2X8;
 				break;
 			}
+		}
 
 		break;
 	}
@@ -2019,6 +2048,45 @@ static void vfe_try_format(struct vfe_line *line,
 	fmt->colorspace = V4L2_COLORSPACE_SRGB;
 }
 
+/*
+ * vfe_try_compose - Handle try compose selection by pad subdev method
+ * @line: VFE line
+ * @cfg: V4L2 subdev pad configuration
+ * @rect: pointer to v4l2 rect structure
+ * @which: wanted subdev format
+ */
+static void vfe_try_compose(struct vfe_line *line,
+			    struct v4l2_subdev_pad_config *cfg,
+			    struct v4l2_rect *rect,
+			    enum v4l2_subdev_format_whence which)
+{
+	struct v4l2_mbus_framefmt *fmt;
+
+	fmt = __vfe_get_format(line, cfg, MSM_VFE_PAD_SINK, which);
+
+	if (rect->width > fmt->width)
+		rect->width = fmt->width;
+
+	if (rect->height > fmt->height)
+		rect->height = fmt->height;
+
+	if (fmt->width > rect->width * SCALER_RATIO_MAX)
+		rect->width = (fmt->width + SCALER_RATIO_MAX - 1) /
+							SCALER_RATIO_MAX;
+
+	rect->width &= ~0x1;
+
+	if (fmt->height > rect->height * SCALER_RATIO_MAX)
+		rect->height = (fmt->height + SCALER_RATIO_MAX - 1) /
+							SCALER_RATIO_MAX;
+
+	if (rect->width < 16)
+		rect->width = 16;
+
+	if (rect->height < 4)
+		rect->height = 4;
+}
+
 /*
  * vfe_enum_mbus_code - Handle pixel format enumeration
  * @sd: VFE V4L2 subdevice
@@ -2114,6 +2182,10 @@ static int vfe_get_format(struct v4l2_subdev *sd,
 	return 0;
 }
 
+static int vfe_set_selection(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_pad_config *cfg,
+			     struct v4l2_subdev_selection *sel);
+
 /*
  * vfe_set_format - Handle set format by pads subdev method
  * @sd: VFE V4L2 subdevice
@@ -2136,19 +2208,125 @@ static int vfe_set_format(struct v4l2_subdev *sd,
 	vfe_try_format(line, cfg, fmt->pad, &fmt->format, fmt->which);
 	*format = fmt->format;
 
-	/* Propagate the format from sink to source */
 	if (fmt->pad == MSM_VFE_PAD_SINK) {
+		struct v4l2_subdev_selection sel = { 0 };
+		int ret;
+
+		/* Propagate the format from sink to source */
 		format = __vfe_get_format(line, cfg, MSM_VFE_PAD_SRC,
 					  fmt->which);
 
 		*format = fmt->format;
 		vfe_try_format(line, cfg, MSM_VFE_PAD_SRC, format,
 			       fmt->which);
+
+		if (line->id != VFE_LINE_PIX)
+			return 0;
+
+		/* Reset sink pad compose selection */
+		sel.which = fmt->which;
+		sel.pad = MSM_VFE_PAD_SINK;
+		sel.target = V4L2_SEL_TGT_COMPOSE;
+		sel.r.width = fmt->format.width;
+		sel.r.height = fmt->format.height;
+		ret = vfe_set_selection(sd, cfg, &sel);
+		if (ret < 0)
+			return ret;
 	}
 
 	return 0;
 }
 
+/*
+ * vfe_get_selection - Handle get selection by pads subdev method
+ * @sd: VFE V4L2 subdevice
+ * @cfg: V4L2 subdev pad configuration
+ * @sel: pointer to v4l2 subdev selection structure
+ *
+ * Return -EINVAL or zero on success
+ */
+static int vfe_get_selection(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_pad_config *cfg,
+			     struct v4l2_subdev_selection *sel)
+{
+	struct vfe_line *line = v4l2_get_subdevdata(sd);
+	struct v4l2_subdev_format fmt = { 0 };
+	struct v4l2_rect *compose;
+	int ret;
+
+	if (line->id != VFE_LINE_PIX || sel->pad != MSM_VFE_PAD_SINK)
+		return -EINVAL;
+
+	switch (sel->target) {
+	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
+		fmt.pad = sel->pad;
+		fmt.which = sel->which;
+		ret = vfe_get_format(sd, cfg, &fmt);
+		if (ret < 0)
+			return ret;
+		sel->r.left = 0;
+		sel->r.top = 0;
+		sel->r.width = fmt.format.width;
+		sel->r.height = fmt.format.height;
+		break;
+	case V4L2_SEL_TGT_COMPOSE:
+		compose = __vfe_get_compose(line, cfg, sel->which);
+		if (compose == NULL)
+			return -EINVAL;
+
+		sel->r = *compose;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * vfe_set_selection - Handle set selection by pads subdev method
+ * @sd: VFE V4L2 subdevice
+ * @cfg: V4L2 subdev pad configuration
+ * @sel: pointer to v4l2 subdev selection structure
+ *
+ * Return -EINVAL or zero on success
+ */
+int vfe_set_selection(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_pad_config *cfg,
+			     struct v4l2_subdev_selection *sel)
+{
+	struct vfe_line *line = v4l2_get_subdevdata(sd);
+	struct v4l2_rect *compose;
+	struct v4l2_subdev_format fmt = { 0 };
+	int ret;
+
+	if (line->id != VFE_LINE_PIX || sel->pad != MSM_VFE_PAD_SINK)
+		return -EINVAL;
+
+	if (sel->target != V4L2_SEL_TGT_COMPOSE)
+		return -EINVAL;
+
+	compose = __vfe_get_compose(line, cfg, sel->which);
+	if (compose == NULL)
+		return -EINVAL;
+
+	vfe_try_compose(line, cfg, &sel->r, sel->which);
+	*compose = sel->r;
+
+	/* Reset source pad format width and height */
+	fmt.which = sel->which;
+	fmt.pad = MSM_VFE_PAD_SRC;
+	ret = vfe_get_format(sd, cfg, &fmt);
+	if (ret < 0)
+		return ret;
+
+	fmt.format.width = compose->width;
+	fmt.format.height = compose->height;
+	ret = vfe_set_format(sd, cfg, &fmt);
+
+	return ret;
+}
+
 /*
  * vfe_init_formats - Initialize formats on all pads
  * @sd: VFE V4L2 subdevice
@@ -2342,6 +2520,8 @@ static const struct v4l2_subdev_pad_ops vfe_pad_ops = {
 	.enum_frame_size = vfe_enum_frame_size,
 	.get_fmt = vfe_get_format,
 	.set_fmt = vfe_set_format,
+	.get_selection = vfe_get_selection,
+	.set_selection = vfe_set_selection,
 };
 
 static const struct v4l2_subdev_ops vfe_v4l2_ops = {

drivers/media/platform/qcom/camss-8x16/camss-vfe.h

@@ -80,6 +80,7 @@ struct vfe_line {
 	struct v4l2_subdev subdev;
 	struct media_pad pads[MSM_VFE_PADS_NUM];
 	struct v4l2_mbus_framefmt fmt[MSM_VFE_PADS_NUM];
+	struct v4l2_rect compose;
 	struct camss_video video_out;
 	struct vfe_output output;
 };