media: rcar-vin: Fix YUYV8_1X16 handling for CSI-2

The YUYV8_1X16 and UYVY8_1X16 formats are treated as 'ITU-R
BT.601/BT.1358 16-bit YCbCr-422 input' (YUV16 - 0x5) in the R-Car VIN
driver and are thus disallowed when capturing frames from the R-Car
CSI-2 interface according to the hardware manual.

As the 1X16 format variants are meant to be used with serial busses they
have to be treated as 'YCbCr-422 8-bit data input' (0x1) when capturing
from CSI-2, which is a valid setting for CSI-2.

Commit 78b3f9d7 ("media: rcar-vin: Add check that input interface
and format are valid") disallowed capturing YUV16 when using the CSI-2
interface. Fix this by using YUV8_BT601 for YCbCr422 when CSI-2 is in
use.

Fixes: 78b3f9d7 ("media: rcar-vin: Add check that input interface and format are valid")
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20240617161135.130719-2-jacopo.mondi@ideasonboard.comSigned-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

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

@@ -742,12 +742,22 @@ static int rvin_setup(struct rvin_dev *vin)
 	 */
 	switch (vin->mbus_code) {
 	case MEDIA_BUS_FMT_YUYV8_1X16:
-		/* BT.601/BT.1358 16bit YCbCr422 */
-		vnmc |= VNMC_INF_YUV16;
+		if (vin->is_csi)
+			/* YCbCr422 8-bit */
+			vnmc |= VNMC_INF_YUV8_BT601;
+		else
+			/* BT.601/BT.1358 16bit YCbCr422 */
+			vnmc |= VNMC_INF_YUV16;
 		input_is_yuv = true;
 		break;
 	case MEDIA_BUS_FMT_UYVY8_1X16:
-		vnmc |= VNMC_INF_YUV16 | VNMC_YCAL;
+		if (vin->is_csi)
+			/* YCbCr422 8-bit */
+			vnmc |= VNMC_INF_YUV8_BT601;
+		else
+			/* BT.601/BT.1358 16bit YCbCr422 */
+			vnmc |= VNMC_INF_YUV16;
+		vnmc |= VNMC_YCAL;
 		input_is_yuv = true;
 		break;
 	case MEDIA_BUS_FMT_UYVY8_2X8: