media: rcar-vin: Invalidate pipeline if conversion is not possible on input formats

Up until now the VIN was capable to convert any of its supported input mbus
formats to any of it's supported output pixel formats. With the addition of
RAW formats this is no longer true.

This patch invalidates the pipeline by adding a check if given vin input
format can be converted to supported output pixel format.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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

@@ -1110,11 +1110,15 @@ static int rvin_mc_validate_format(struct rvin_dev *vin, struct v4l2_subdev *sd,
 	case MEDIA_BUS_FMT_UYVY8_2X8:
 	case MEDIA_BUS_FMT_UYVY10_2X10:
 	case MEDIA_BUS_FMT_RGB888_1X24:
-		vin->mbus_code = fmt.format.code;
+		break;
+	case MEDIA_BUS_FMT_SRGGB8_1X8:
+		if (vin->format.pixelformat != V4L2_PIX_FMT_SRGGB8)
+			return -EPIPE;
 		break;
 	default:
 		return -EPIPE;
 	}
+	vin->mbus_code = fmt.format.code;
 
 	switch (fmt.format.field) {
 	case V4L2_FIELD_TOP:

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

@@ -350,9 +350,9 @@ static int rvin_enum_fmt_vid_cap(struct file *file, void *priv,
 	 * all of the related pixel formats. If mbus_code is not set enumerate
 	 * all possible pixelformats.
 	 *
-	 * TODO: Once raw capture formats are added to the driver this needs
-	 * to be extended so raw media bus codes only result in raw pixel
-	 * formats.
+	 * TODO: Once raw MEDIA_BUS_FMT_SRGGB12_1X12 format is added to the
+	 * driver this needs to be extended so raw media bus code only result in
+	 * raw pixel format.
 	 */
 	switch (f->mbus_code) {
 	case 0:
@@ -362,6 +362,11 @@ static int rvin_enum_fmt_vid_cap(struct file *file, void *priv,
 	case MEDIA_BUS_FMT_UYVY10_2X10:
 	case MEDIA_BUS_FMT_RGB888_1X24:
 		break;
+	case MEDIA_BUS_FMT_SRGGB8_1X8:
+		if (f->index)
+			return -EINVAL;
+		f->pixelformat = V4L2_PIX_FMT_SRGGB8;
+		return 0;
 	default:
 		return -EINVAL;
 	}