[media] vivid-tpg: add support for V4L2_PIX_FMT_GREY

Add monochrome support to the TPG.
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

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

@@ -199,6 +199,7 @@ bool tpg_s_fourcc(struct tpg_data *tpg, u32 fourcc)
 	case V4L2_PIX_FMT_XBGR32:
 	case V4L2_PIX_FMT_ARGB32:
 	case V4L2_PIX_FMT_ABGR32:
+	case V4L2_PIX_FMT_GREY:
 		tpg->is_yuv = false;
 		break;
 	case V4L2_PIX_FMT_YUV420M:
@@ -279,6 +280,9 @@ bool tpg_s_fourcc(struct tpg_data *tpg, u32 fourcc)
 	case V4L2_PIX_FMT_ABGR32:
 		tpg->twopixelsize[0] = 2 * 4;
 		break;
+	case V4L2_PIX_FMT_GREY:
+		tpg->twopixelsize[0] = 2;
+		break;
 	case V4L2_PIX_FMT_NV12:
 	case V4L2_PIX_FMT_NV21:
 	case V4L2_PIX_FMT_NV12M:
@@ -598,7 +602,7 @@ static void precalculate_color(struct tpg_data *tpg, int k)
 		g <<= 4;
 		b <<= 4;
 	}
-	if (tpg->qual == TPG_QUAL_GRAY) {
+	if (tpg->qual == TPG_QUAL_GRAY || tpg->fourcc == V4L2_PIX_FMT_GREY) {
 		/* Rec. 709 Luma function */
 		/* (0.2126, 0.7152, 0.0722) * (255 * 256) */
 		r = g = b = (13879 * r + 46688 * g + 4713 * b) >> 16;
@@ -739,6 +743,9 @@ static void gen_twopix(struct tpg_data *tpg,
 	b_v = tpg->colors[color][2]; /* B or precalculated V */
 
 	switch (tpg->fourcc) {
+	case V4L2_PIX_FMT_GREY:
+		buf[0][offset] = r_y;
+		break;
 	case V4L2_PIX_FMT_YUV422P:
 	case V4L2_PIX_FMT_YUV420:
 	case V4L2_PIX_FMT_YUV420M: