Re: [PATCH v3 17/24] media: imx: Add CSI subdev driver

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On 01/16/2017 07:03 AM, Philipp Zabel wrote:
On Fri, 2017-01-06 at 18:11 -0800, Steve Longerbeam wrote:
This is a media entity subdevice for the i.MX Camera
Serial Interface module.
s/Serial/Sensor/

done.

Signed-off-by: Steve Longerbeam <steve_longerbeam@xxxxxxxxxx>
---
  drivers/staging/media/imx/Kconfig   |  13 +
  drivers/staging/media/imx/Makefile  |   2 +
  drivers/staging/media/imx/imx-csi.c | 644 ++++++++++++++++++++++++++++++++++++
  3 files changed, 659 insertions(+)
  create mode 100644 drivers/staging/media/imx/imx-csi.c

diff --git a/drivers/staging/media/imx/Kconfig b/drivers/staging/media/imx/Kconfig
index bfde58d..ce2d2c8 100644
--- a/drivers/staging/media/imx/Kconfig
+++ b/drivers/staging/media/imx/Kconfig
@@ -6,3 +6,16 @@ config VIDEO_IMX_MEDIA
  	  Say yes here to enable support for video4linux media controller
  	  driver for the i.MX5/6 SOC.
+if VIDEO_IMX_MEDIA
+menu "i.MX5/6 Media Sub devices"
+
+config VIDEO_IMX_CAMERA
s/CAMERA/CSI/ ?

done.

+	tristate "i.MX5/6 Camera driver"
i.MX5/6 Camera Sensor Interface driver

done.


+
+struct csi_priv {
+	struct device *dev;
+	struct ipu_soc *ipu;
+	struct imx_media_dev *md;
+	struct v4l2_subdev sd;
+	struct media_pad pad[CSI_NUM_PADS];
+	struct v4l2_mbus_framefmt format_mbus[CSI_NUM_PADS];
+	struct v4l2_mbus_config sensor_mbus_cfg;
+	struct v4l2_rect crop;
+	struct ipu_csi *csi;
+	int csi_id;
+	int input_pad;
+	int output_pad;
+	bool power_on;  /* power is on */
+	bool stream_on; /* streaming is on */
+
+	/* the sink for the captured frames */
+	struct v4l2_subdev *sink_sd;
+	enum ipu_csi_dest dest;
+	struct v4l2_subdev *src_sd;
src_sd is not used except that its presence marks an enabled input link.
-> could be changed to bool.

For now I prefer to keep it a pointer to the src/sink subdevs.
At some point the CSI may have some reason to know the
identity of the source.


+	struct v4l2_ctrl_handler ctrl_hdlr;
+	struct imx_media_fim *fim;
+
+	/* the attached sensor at stream on */
+	struct imx_media_subdev *sensor;
+};
+
+static inline struct csi_priv *sd_to_dev(struct v4l2_subdev *sdev)
+{
+	return container_of(sdev, struct csi_priv, sd);
+}
+
+/* Update the CSI whole sensor and active windows */
+static int csi_setup(struct csi_priv *priv)
+{
+	struct v4l2_mbus_framefmt infmt;
+
+	ipu_csi_set_window(priv->csi, &priv->crop);
+
+	/*
+	 * the ipu-csi doesn't understand ALTERNATE, but it only
+	 * needs to know whether the stream is interlaced, so set
+	 * to INTERLACED if infmt field is ALTERNATE.
+	 */
+	infmt = priv->format_mbus[priv->input_pad];
+	if (infmt.field == V4L2_FIELD_ALTERNATE)
+		infmt.field = V4L2_FIELD_INTERLACED;
That should be SEQ_TB/BT depending on video standard.

fixed.

+
+static int csi_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct csi_priv *priv = v4l2_get_subdevdata(sd);
+	int ret = 0;
+
+	if (!priv->src_sd || !priv->sink_sd)
+		return -EPIPE;
+
+	v4l2_info(sd, "stream %s\n", enable ? "ON" : "OFF");
These could be silenced a bit.

yeah, I think it is time for that. I've silenced all the
v4l2_info()'s for stream on/off, power on/off, as well
as some others.


+static int csi_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct csi_priv *priv = v4l2_get_subdevdata(sd);
+	int ret = 0;
+
+	v4l2_info(sd, "power %s\n", on ? "ON" : "OFF");
+
+	if (priv->fim && on != priv->power_on)
+		ret = imx_media_fim_set_power(priv->fim, on);
+
+	if (!ret)
+		priv->power_on = on;
+	return ret;
+}
Is this called multiple times? I'd expect a poweron during open and a
poweroff during close, so no need for priv->power_on.

It is actually called multiple times. The s_power subdev callbacks are
made every time there is a new link established, in the imx-media core's
link_notify(), in order to re-establish power to the active subdevs in the
new pipeline.

This might change after I look into using v4l2_pipeline_pm_use().


+static int csi_link_setup(struct media_entity *entity,
+			  const struct media_pad *local,
+			  const struct media_pad *remote, u32 flags)
+{
+	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
+	struct csi_priv *priv = v4l2_get_subdevdata(sd);
+	struct v4l2_subdev *remote_sd;
+
+	dev_dbg(priv->dev, "link setup %s -> %s", remote->entity->name,
+		local->entity->name);
+
+	remote_sd = media_entity_to_v4l2_subdev(remote->entity);
+
+	if (local->flags & MEDIA_PAD_FL_SINK) {
+		if (flags & MEDIA_LNK_FL_ENABLED) {
+			if (priv->src_sd)
+				return -EBUSY;
+			priv->src_sd = remote_sd;
+		} else {
+			priv->src_sd = NULL;
+		}
+
+		return 0;
+	}
+
+	if (flags & MEDIA_LNK_FL_ENABLED) {
+		if (priv->sink_sd)
+			return -EBUSY;
+		priv->sink_sd = remote_sd;
+	} else {
+		priv->sink_sd = NULL;
+		return 0;
+	}
+
+	/* set CSI destination */
+	switch (remote_sd->grp_id) {
+	case IMX_MEDIA_GRP_ID_SMFC0:
+	case IMX_MEDIA_GRP_ID_SMFC1:
+	case IMX_MEDIA_GRP_ID_SMFC2:
+	case IMX_MEDIA_GRP_ID_SMFC3:
With removal of the SMFC entities, CSI0 could be fixed to SMFC0 and CSI1
to the SMFC2 channel.

right, I'll do that.


[...]
+static int csi_set_fmt(struct v4l2_subdev *sd,
+		       struct v4l2_subdev_pad_config *cfg,
+		       struct v4l2_subdev_format *sdformat)
+{
+	struct csi_priv *priv = v4l2_get_subdevdata(sd);
+	struct v4l2_mbus_framefmt *infmt, *outfmt;
+	struct v4l2_rect crop;
+	int ret;
+
+	if (sdformat->pad >= CSI_NUM_PADS)
+		return -EINVAL;
+
+	if (priv->stream_on)
+		return -EBUSY;
+
+	infmt = &priv->format_mbus[priv->input_pad];
+	outfmt = &priv->format_mbus[priv->output_pad];
+
+	if (sdformat->pad == priv->output_pad) {
+		sdformat->format.code = infmt->code;
+		sdformat->format.field = infmt->field;
+		crop.left = priv->crop.left;
+		crop.top = priv->crop.top;
+		crop.width = sdformat->format.width;
+		crop.height = sdformat->format.height;
+		ret = csi_try_crop(priv, &crop);
+		if (ret)
+			return ret;
+		sdformat->format.width = crop.width;
+		sdformat->format.height = crop.height;
+	}
+
+	if (sdformat->which == V4L2_SUBDEV_FORMAT_TRY) {
Should there be some limitations on the format here?

done, I've added call to v4l_bound_align_image(), passing
it the min/max frame sizes. CSI's sensor/active frame size
register fields are 12 bits, so max is 4096 for both width and
height.


Steve

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