media: coda: V4L2_PIX_FMT_GREY for coda960 JPEG Encoder

support greyscale pix fmt input for coda9_jpeg_encoder. The hardware
supports it, so allow V4L2 Mem2Mem JPEG Encoder use it as well. Tested
on an i.MX6QP.

[hverkuil: updated the Subject line as suggested by Philipp]
Signed-off-by: Martin Weber <martin.weber@br-automation.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+huawei@kernel.org>

drivers/media/platform/coda/coda-common.c

@@ -43,7 +43,7 @@
 #define CODA_NAME		"coda"
 
 #define CODADX6_MAX_INSTANCES	4
-#define CODA_MAX_FORMATS	4
+#define CODA_MAX_FORMATS	5
 
 #define CODA_ISRAM_SIZE	(2048 * 2)
 
@@ -247,6 +247,7 @@ static const struct coda_video_device coda9_jpeg_encoder = {
 		V4L2_PIX_FMT_YUV420,
 		V4L2_PIX_FMT_YVU420,
 		V4L2_PIX_FMT_YUV422P,
+		V4L2_PIX_FMT_GREY,
 	},
 	.dst_formats = {
 		V4L2_PIX_FMT_JPEG,
@@ -626,6 +627,11 @@ static int coda_try_fmt(struct coda_ctx *ctx, const struct coda_codec *codec,
 		f->fmt.pix.sizeimage = f->fmt.pix.bytesperline *
 					f->fmt.pix.height * 2;
 		break;
+	case V4L2_PIX_FMT_GREY:
+		/* keep 16 pixel alignment of 8-bit pixel data */
+		f->fmt.pix.bytesperline = round_up(f->fmt.pix.width, 16);
+		f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * f->fmt.pix.height;
+		break;
 	case V4L2_PIX_FMT_JPEG:
 	case V4L2_PIX_FMT_H264:
 	case V4L2_PIX_FMT_MPEG4: