media: Add NV15_4L4 pixel format

NV15_4L4 is the 10-bits per component 4x4 tiled format.
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst

@@ -137,6 +137,13 @@ All components are stored with the same number of bits per component.
       - Cb, Cr
       - No
       - Linear
+    * - V4L2_PIX_FMT_NV15_4L4
+      - 'VT15'
+      - 15
+      - 4:2:0
+      - Cb, Cr
+      - Yes
+      - 4x4 tiles
     * - V4L2_PIX_FMT_NV16
       - 'NV16'
       - 8
@@ -378,6 +385,15 @@ two non-contiguous planes.
 
     Example V4L2_PIX_FMT_NV12MT memory layout of tiles
 
+.. _V4L2-PIX-FMT-NV15-4L4:
+
+Tiled NV15
+----------
+
+Semi-planar 10-bit YUV 4:2:0 formats, using 4x4 tiling.
+All components are packed without any padding between each other.
+As a side-effect, each group of 4 components are stored over 5 bytes
+(YYYY or UVUV = 4 * 10 bits = 40 bits = 5 bytes).
 
 .. _V4L2-PIX-FMT-NV16:
 .. _V4L2-PIX-FMT-NV61:

drivers/media/v4l2-core/v4l2-common.c

@@ -283,6 +283,8 @@ const struct v4l2_format_info *v4l2_format_info(u32 format)
 
 		/* Tiled YUV formats */
 		{ .format = V4L2_PIX_FMT_NV12_4L4, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 },
+		{ .format = V4L2_PIX_FMT_NV15_4L4, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 5, 10, 0, 0 }, .bpp_div = { 4, 4, 1, 1 }, .hdiv = 2, .vdiv = 2,
+		  .block_w = { 4, 2, 0, 0 }, .block_h = { 1, 1, 0, 0 }},
 		{ .format = V4L2_PIX_FMT_P010_4L4, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 2, 4, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 },
 
 		/* YUV planar formats, non contiguous variant */

drivers/media/v4l2-core/v4l2-ioctl.c

@@ -1356,6 +1356,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
 	case V4L2_PIX_FMT_NV12_4L4:	descr = "Y/UV 4:2:0 (4x4 Linear)"; break;
 	case V4L2_PIX_FMT_NV12_16L16:	descr = "Y/UV 4:2:0 (16x16 Linear)"; break;
 	case V4L2_PIX_FMT_NV12_32L32:   descr = "Y/UV 4:2:0 (32x32 Linear)"; break;
+	case V4L2_PIX_FMT_NV15_4L4:	descr = "10-bit Y/UV 4:2:0 (4x4 Linear)"; break;
 	case V4L2_PIX_FMT_P010_4L4:	descr = "10-bit Y/UV 4:2:0 (4x4 Linear)"; break;
 	case V4L2_PIX_FMT_NV12M:	descr = "Y/UV 4:2:0 (N-C)"; break;
 	case V4L2_PIX_FMT_NV21M:	descr = "Y/VU 4:2:0 (N-C)"; break;

include/uapi/linux/videodev2.h

@@ -672,6 +672,7 @@ struct v4l2_pix_format {
 #define V4L2_PIX_FMT_NV12_4L4 v4l2_fourcc('V', 'T', '1', '2')   /* 12  Y/CbCr 4:2:0  4x4 tiles */
 #define V4L2_PIX_FMT_NV12_16L16 v4l2_fourcc('H', 'M', '1', '2') /* 12  Y/CbCr 4:2:0 16x16 tiles */
 #define V4L2_PIX_FMT_NV12_32L32 v4l2_fourcc('S', 'T', '1', '2') /* 12  Y/CbCr 4:2:0 32x32 tiles */
+#define V4L2_PIX_FMT_NV15_4L4 v4l2_fourcc('V', 'T', '1', '5') /* 15 Y/CbCr 4:2:0 10-bit 4x4 tiles */
 #define V4L2_PIX_FMT_P010_4L4 v4l2_fourcc('T', '0', '1', '0') /* 12  Y/CbCr 4:2:0 10-bit 4x4 macroblocks */
 #define V4L2_PIX_FMT_NV12_8L128       v4l2_fourcc('A', 'T', '1', '2') /* Y/CbCr 4:2:0 8x128 tiles */
 #define V4L2_PIX_FMT_NV12_10BE_8L128  v4l2_fourcc_be('A', 'X', '1', '2') /* Y/CbCr 4:2:0 10-bit 8x128 tiles */