[PATCH v6 38/39] media: imx-ic-prpencvf: add frame size enumeration

[Steve Longerbeam]

Add frame size enumeration operation. The PRP ENC/VF subdevices
are scalers, so they can output a continuous range of widths/
heights on their source pads.

Signed-off-by: Steve Longerbeam <steve_longerb...@mentor.com>
---
 drivers/staging/media/imx/imx-ic-prpencvf.c | 40 +++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c 
b/drivers/staging/media/imx/imx-ic-prpencvf.c
index 4123b03..860b406 100644
--- a/drivers/staging/media/imx/imx-ic-prpencvf.c
+++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
@@ -875,6 +875,45 @@ static int prp_set_fmt(struct v4l2_subdev *sd,
        return ret;
 }
 
+static int prp_enum_frame_size(struct v4l2_subdev *sd,
+                              struct v4l2_subdev_pad_config *cfg,
+                              struct v4l2_subdev_frame_size_enum *fse)
+{
+       struct prp_priv *priv = sd_to_priv(sd);
+       struct v4l2_subdev_format format = {0};
+       const struct imx_media_pixfmt *cc;
+       int ret = 0;
+
+       if (fse->pad >= PRPENCVF_NUM_PADS || fse->index != 0)
+               return -EINVAL;
+
+       mutex_lock(&priv->lock);
+
+       format.pad = fse->pad;
+       format.which = fse->which;
+       format.format.code = fse->code;
+       format.format.width = 1;
+       format.format.height = 1;
+       prp_try_fmt(priv, cfg, &format, &cc);
+       fse->min_width = format.format.width;
+       fse->min_height = format.format.height;
+
+       if (format.format.code != fse->code) {
+               ret = -EINVAL;
+               goto out;
+       }
+
+       format.format.code = fse->code;
+       format.format.width = -1;
+       format.format.height = -1;
+       prp_try_fmt(priv, cfg, &format, &cc);
+       fse->max_width = format.format.width;
+       fse->max_height = format.format.height;
+out:
+       mutex_unlock(&priv->lock);
+       return ret;
+}
+
 static int prp_link_setup(struct media_entity *entity,
                          const struct media_pad *local,
                          const struct media_pad *remote, u32 flags)
@@ -1125,6 +1164,7 @@ static void prp_unregistered(struct v4l2_subdev *sd)
 
 static struct v4l2_subdev_pad_ops prp_pad_ops = {
        .enum_mbus_code = prp_enum_mbus_code,
+       .enum_frame_size = prp_enum_frame_size,
        .get_fmt = prp_get_fmt,
        .set_fmt = prp_set_fmt,
        .link_validate = prp_link_validate,
-- 
2.7.4