media: imx: interweave and odd-chroma-row skip are incompatible

If IDMAC interweaving is enabled in a write channel, the channel must
write the odd chroma rows for 4:2:0 formats. Skipping writing the odd
chroma rows produces corrupted captured 4:2:0 images when interweave
is enabled.
Reported-by: Krzysztof Ha?asa <khalasa@piap.pl>
Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/staging/media/imx/imx-ic-prpencvf.c

@@ -391,12 +391,17 @@ static int prp_setup_channel(struct prp_priv *priv,
 	image.phys0 = addr0;
 	image.phys1 = addr1;
 
-	if (channel == priv->out_ch || channel == priv->rot_out_ch) {
+	/*
+	 * Skip writing U and V components to odd rows in the output
+	 * channels for planar 4:2:0 (but not when enabling IDMAC
+	 * interweaving, they are incompatible).
+	 */
+	if (!interweave && (channel == priv->out_ch ||
+			    channel == priv->rot_out_ch)) {
 		switch (image.pix.pixelformat) {
 		case V4L2_PIX_FMT_YUV420:
 		case V4L2_PIX_FMT_YVU420:
 		case V4L2_PIX_FMT_NV12:
-			/* Skip writing U and V components to odd rows */
 			ipu_cpmem_skip_odd_chroma_rows(channel);
 			break;
 		}

drivers/staging/media/imx/imx-media-csi.c

@@ -457,7 +457,11 @@ static int csi_idmac_setup_channel(struct csi_priv *priv)
 			     ((image.pix.width & 0x1f) ?
 			      ((image.pix.width & 0xf) ? 8 : 16) : 32) : 64;
 		passthrough_bits = 16;
-		/* Skip writing U and V components to odd rows */
+		/*
+		 * Skip writing U and V components to odd rows (but not
+		 * when enabling IDMAC interweaving, they are incompatible).
+		 */
+		if (!interweave)
 			ipu_cpmem_skip_odd_chroma_rows(priv->idmac_ch);
 		break;
 	case V4L2_PIX_FMT_YUYV: