[media] media: mtk-mdp: support pixelformat V4L2_PIX_FMT_MT21C

Add V4L2_PIX_FMT_MT21C in format list.

[mchehab@s-opensource.org: re-add mtk_mdp_size_align]
Signed-off-by: Minghsiu Tsai <minghsiu.tsai@mediatek.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c

@@ -54,6 +54,14 @@ static struct mtk_mdp_pix_align mtk_mdp_size_align = {
 
 static const struct mtk_mdp_fmt mtk_mdp_formats[] = {
 	{
+		.pixelformat	= V4L2_PIX_FMT_MT21C,
+		.depth		= { 8, 4 },
+		.row_depth	= { 8, 8 },
+		.num_planes	= 2,
+		.num_comp	= 2,
+		.align		= &mtk_mdp_size_align,
+		.flags		= MTK_MDP_FMT_FLAG_OUTPUT,
+	}, {
 		.pixelformat	= V4L2_PIX_FMT_NV12M,
 		.depth		= { 8, 4 },
 		.row_depth	= { 8, 8 },

drivers/media/platform/mtk-mdp/mtk_mdp_regs.c

@@ -29,6 +29,8 @@ enum MDP_COLOR_ENUM {
 	MDP_COLOR_NV12 = MDP_COLORFMT_PACK(0, 2, 1, 1, 1, 8, 1, 0, 12),
 	MDP_COLOR_I420 = MDP_COLORFMT_PACK(0, 3, 0, 1, 1, 8, 1, 0, 8),
 	MDP_COLOR_YV12 = MDP_COLORFMT_PACK(0, 3, 0, 1, 1, 8, 1, 1, 8),
+	/* Mediatek proprietary format */
+	MDP_COLOR_420_MT21 = MDP_COLORFMT_PACK(5, 2, 1, 1, 1, 256, 1, 0, 12),
 };
 
 static int32_t mtk_mdp_map_color_format(int v4l2_format)
@@ -37,6 +39,8 @@ static int32_t mtk_mdp_map_color_format(int v4l2_format)
 	case V4L2_PIX_FMT_NV12M:
 	case V4L2_PIX_FMT_NV12:
 		return MDP_COLOR_NV12;
+	case V4L2_PIX_FMT_MT21C:
+		return MDP_COLOR_420_MT21;
 	case V4L2_PIX_FMT_YUV420M:
 	case V4L2_PIX_FMT_YUV420:
 		return MDP_COLOR_I420;