[media] media/vivid: Add support for Y16 format

Support for V4L2_PIX_FMT_Y16, a 16 bit greyscale format.
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/vivid/vivid-tpg.c

@@ -220,6 +220,7 @@ bool tpg_s_fourcc(struct tpg_data *tpg, u32 fourcc)
 	case V4L2_PIX_FMT_ARGB32:
 	case V4L2_PIX_FMT_ABGR32:
 	case V4L2_PIX_FMT_GREY:
+	case V4L2_PIX_FMT_Y16:
 		tpg->is_yuv = false;
 		break;
 	case V4L2_PIX_FMT_YUV444:
@@ -313,6 +314,7 @@ bool tpg_s_fourcc(struct tpg_data *tpg, u32 fourcc)
 	case V4L2_PIX_FMT_YUV444:
 	case V4L2_PIX_FMT_YUV555:
 	case V4L2_PIX_FMT_YUV565:
+	case V4L2_PIX_FMT_Y16:
 		tpg->twopixelsize[0] = 2 * 2;
 		break;
 	case V4L2_PIX_FMT_RGB24:
@@ -712,7 +714,8 @@ static void precalculate_color(struct tpg_data *tpg, int k)
 		g <<= 4;
 		b <<= 4;
 	}
-	if (tpg->qual == TPG_QUAL_GRAY || tpg->fourcc == V4L2_PIX_FMT_GREY) {
+	if (tpg->qual == TPG_QUAL_GRAY || tpg->fourcc == V4L2_PIX_FMT_GREY ||
+	    tpg->fourcc == V4L2_PIX_FMT_Y16) {
 		/* Rec. 709 Luma function */
 		/* (0.2126, 0.7152, 0.0722) * (255 * 256) */
 		r = g = b = (13879 * r + 46688 * g + 4713 * b) >> 16;
@@ -895,6 +898,10 @@ static void gen_twopix(struct tpg_data *tpg,
 	case V4L2_PIX_FMT_GREY:
 		buf[0][offset] = r_y;
 		break;
+	case V4L2_PIX_FMT_Y16:
+		buf[0][offset] = 0;
+		buf[0][offset+1] = r_y;
+		break;
 	case V4L2_PIX_FMT_YUV422P:
 	case V4L2_PIX_FMT_YUV420:
 	case V4L2_PIX_FMT_YUV420M:

drivers/media/platform/vivid/vivid-vid-common.c

@@ -188,6 +188,14 @@ struct vivid_fmt vivid_formats[] = {
 		.planes   = 1,
 		.buffers = 1,
 	},
+	{
+		.fourcc   = V4L2_PIX_FMT_Y16,
+		.vdownsampling = { 1 },
+		.bit_depth = { 16 },
+		.is_yuv   = true,
+		.planes   = 1,
+		.buffers = 1,
+	},
 	{
 		.fourcc   = V4L2_PIX_FMT_RGB332, /* rrrgggbb */
 		.vdownsampling = { 1 },