media: rcar-vin: force default colorspace for media centric mode

The V4L2 specification clearly documents the colorspace fields as being
set by drivers for capture devices. Using the values supplied by
userspace thus wouldn't comply with the API. Until the API is updated to
allow for userspace to set these Hans wants the fields to be set by the
driver to fixed values.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/rcar-vin/rcar-v4l2.c

@@ -662,12 +662,30 @@ static const struct v4l2_ioctl_ops rvin_ioctl_ops = {
  * V4L2 Media Controller
  */
 
+static void rvin_mc_try_format(struct rvin_dev *vin,
+			       struct v4l2_pix_format *pix)
+{
+	/*
+	 * The V4L2 specification clearly documents the colorspace fields
+	 * as being set by drivers for capture devices. Using the values
+	 * supplied by userspace thus wouldn't comply with the API. Until
+	 * the API is updated force fixed vaules.
+	 */
+	pix->colorspace = RVIN_DEFAULT_COLORSPACE;
+	pix->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(pix->colorspace);
+	pix->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(pix->colorspace);
+	pix->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true, pix->colorspace,
+							  pix->ycbcr_enc);
+
+	rvin_format_align(vin, pix);
+}
+
 static int rvin_mc_try_fmt_vid_cap(struct file *file, void *priv,
 				   struct v4l2_format *f)
 {
 	struct rvin_dev *vin = video_drvdata(file);
 
-	rvin_format_align(vin, &f->fmt.pix);
+	rvin_mc_try_format(vin, &f->fmt.pix);
 
 	return 0;
 }
@@ -680,7 +698,7 @@ static int rvin_mc_s_fmt_vid_cap(struct file *file, void *priv,
 	if (vb2_is_busy(&vin->queue))
 		return -EBUSY;
 
-	rvin_format_align(vin, &f->fmt.pix);
+	rvin_mc_try_format(vin, &f->fmt.pix);
 
 	vin->format = f->fmt.pix;