linux-kernel - [PATCH 04/10] media: Add Y312 video format

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Date:   Tue, 20 Dec 2022 11:11:34 +0800
From:   Ming Qian <ming.qian@....com>
To:     mchehab@...nel.org, mirela.rabulea@....nxp.com,
        hverkuil-cisco@...all.nl
Cc:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, xiahong.bao@....com, linux-imx@....com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 04/10] media: Add Y312 video format

Y312 is a YUV format with 12-bits per component like YUV24,
expanded to 16bits.
Data in the 12 high bits, zeros in the 4 low bits,
arranged in little endian order.

Signed-off-by: Ming Qian <ming.qian@....com>
---
 .../media/v4l/pixfmt-packed-yuv.rst           | 28 +++++++++++++++++++
 drivers/media/v4l2-core/v4l2-common.c         |  1 +
 drivers/media/v4l2-core/v4l2-ioctl.c          |  1 +
 include/uapi/linux/videodev2.h                |  1 +
 4 files changed, 31 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/pixfmt-packed-yuv.rst b/Documentation/userspace-api/media/v4l/pixfmt-packed-yuv.rst
index 39ded0b1e65c..a91c30ba6b73 100644
--- a/Documentation/userspace-api/media/v4l/pixfmt-packed-yuv.rst
+++ b/Documentation/userspace-api/media/v4l/pixfmt-packed-yuv.rst
@@ -257,6 +257,34 @@ the second byte and Y'\ :sub:`7-0` in the third byte.
     - The padding bits contain undefined values that must be ignored by all
       applications and drivers.
 
+The next lists the packed YUV 4:4:4 formats with more than 8 bits per component.
+expand the bits per component to 16 bits, data in the high bits, zeros in the low bits,
+arranged in little endian order. storing 1 pixels in 6 bytes.
+
+.. flat-table:: Packed YUV 4:4:4 Image Formats (more than 8bpc)
+    :header-rows: 1
+    :stub-columns: 0
+
+    * - Identifier
+      - Code
+      - Byte 1-0
+      - Byte 3-2
+      - Byte 5-4
+      - Byte 7-6
+      - Byte 9-8
+      - Byte 11-10
+
+    * .. _V4L2-PIX-FMT-Y312:
+
+      - ``V4L2_PIX_FMT_Y312``
+      - 'Y312'
+
+      - Y'\ :sub:`0`
+      - Cb\ :sub:`0`
+      - Cr\ :sub:`0`
+      - Y'\ :sub:`1`
+      - Cb\ :sub:`1`
+      - Cr\ :sub:`1`
 
 4:2:2 Subsampling
 =================
diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
index 21ace56fac04..332d4b11bc1b 100644
--- a/drivers/media/v4l2-core/v4l2-common.c
+++ b/drivers/media/v4l2-core/v4l2-common.c
@@ -259,6 +259,7 @@ const struct v4l2_format_info *v4l2_format_info(u32 format)
 		{ .format = V4L2_PIX_FMT_UYVY,    .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
 		{ .format = V4L2_PIX_FMT_VYUY,    .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
 		{ .format = V4L2_PIX_FMT_Y212,    .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
+		{ .format = V4L2_PIX_FMT_Y312,    .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 6, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
 
 		/* YUV planar formats */
 		{ .format = V4L2_PIX_FMT_NV12,    .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 4d5f722b674a..5b97d7e5dbbf 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1343,6 +1343,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
 	case V4L2_PIX_FMT_HI240:	descr = "8-bit Dithered RGB (BTTV)"; break;
 	case V4L2_PIX_FMT_M420:		descr = "YUV 4:2:0 (M420)"; break;
 	case V4L2_PIX_FMT_Y212:		descr = "12-bit Depth YUYV 4:2:2"; break;
+	case V4L2_PIX_FMT_Y312:		descr = "12-bit Depth YUV 4:4:4"; break;
 	case V4L2_PIX_FMT_NV12:		descr = "Y/UV 4:2:0"; break;
 	case V4L2_PIX_FMT_NV21:		descr = "Y/VU 4:2:0"; break;
 	case V4L2_PIX_FMT_NV16:		descr = "Y/UV 4:2:2"; break;
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index b8a501dccfa4..3475331737af 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -619,6 +619,7 @@ struct v4l2_pix_format {
 #define V4L2_PIX_FMT_YUVX32  v4l2_fourcc('Y', 'U', 'V', 'X') /* 32  YUVX-8-8-8-8  */
 #define V4L2_PIX_FMT_M420    v4l2_fourcc('M', '4', '2', '0') /* 12  YUV 4:2:0 2 lines y, 1 line uv interleaved */
 #define V4L2_PIX_FMT_Y212    v4l2_fourcc('Y', '2', '1', '2') /* 32  YUYV 12-bit per component */
+#define V4L2_PIX_FMT_Y312    v4l2_fourcc('Y', '3', '1', '2') /* 48  YUV 4:4:4 12-bit per component */
 
 /* two planes -- one Y, one Cr + Cb interleaved  */
 #define V4L2_PIX_FMT_NV12    v4l2_fourcc('N', 'V', '1', '2') /* 12  Y/CbCr 4:2:0  */
-- 
2.38.1