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From 85e4a24a7f8fd96cc765c038bbae601ca69daa39 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Thu, 7 May 2020 16:59:03 +0100
Subject: [PATCH] media: Add a pixel format for MIPI packed 12bit luma
only.
This is the format used by monochrome 12bit image sensors.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
.../userspace-api/media/v4l/pixfmt-y12p.rst | 45 +++++++++++++++++++
.../userspace-api/media/v4l/yuv-formats.rst | 1 +
drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
include/uapi/linux/videodev2.h | 1 +
4 files changed, 48 insertions(+)
create mode 100644 Documentation/userspace-api/media/v4l/pixfmt-y12p.rst
--- /dev/null
+++ b/Documentation/userspace-api/media/v4l/pixfmt-y12p.rst
@@ -0,0 +1,45 @@
+.. Permission is granted to copy, distribute and/or modify this
+.. document under the terms of the GNU Free Documentation License,
+.. Version 1.1 or any later version published by the Free Software
+.. Foundation, with no Invariant Sections, no Front-Cover Texts
+.. and no Back-Cover Texts. A copy of the license is included at
+.. Documentation/media/uapi/fdl-appendix.rst.
+..
+.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
+
+.. _V4L2-PIX-FMT-Y12P:
+
+******************************
+V4L2_PIX_FMT_Y12P ('Y12P')
+******************************
+
+Grey-scale image as a MIPI RAW12 packed array
+
+
+Description
+===========
+
+This is a packed grey-scale image format with a depth of 12 bits per
+pixel. Two consecutive pixels are packed into 3 bytes. The first 2 bytes
+contain the 8 high order bits of the pixels, and the 3rd byte contains the 4
+least significants bits of each pixel, in the same order.
+
+**Byte Order.**
+Each cell is one byte.
+
+.. tabularcolumns:: |p{2.2cm}|p{1.2cm}|p{1.2cm}|p{3.1cm}|
+
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 2 1 1 1
+
+
+ - - start + 0:
+ - Y'\ :sub:`00high`
+ - Y'\ :sub:`01high`
+ - Y'\ :sub:`01low`\ (bits 7--4)
+
+ Y'\ :sub:`00low`\ (bits 3--0)
+
--- a/Documentation/userspace-api/media/v4l/yuv-formats.rst
+++ b/Documentation/userspace-api/media/v4l/yuv-formats.rst
@@ -28,6 +28,7 @@ to brightness information.
pixfmt-grey
pixfmt-y10
pixfmt-y12
+ pixfmt-y12p
pixfmt-y14
pixfmt-y10b
pixfmt-y10p
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1283,6 +1283,7 @@ static void v4l_fill_fmtdesc(struct v4l2
case V4L2_PIX_FMT_Y16_BE: descr = "16-bit Greyscale BE"; break;
case V4L2_PIX_FMT_Y10BPACK: descr = "10-bit Greyscale (Packed)"; break;
case V4L2_PIX_FMT_Y10P: descr = "10-bit Greyscale (MIPI Packed)"; break;
+ case V4L2_PIX_FMT_Y12P: descr = "12-bit Greyscale (MIPI Packed)"; break;
case V4L2_PIX_FMT_Y8I: descr = "Interleaved 8-bit Greyscale"; break;
case V4L2_PIX_FMT_Y12I: descr = "Interleaved 12-bit Greyscale"; break;
case V4L2_PIX_FMT_Z16: descr = "16-bit Depth"; break;
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -580,6 +580,7 @@ struct v4l2_pix_format {
/* Grey bit-packed formats */
#define V4L2_PIX_FMT_Y10BPACK v4l2_fourcc('Y', '1', '0', 'B') /* 10 Greyscale bit-packed */
#define V4L2_PIX_FMT_Y10P v4l2_fourcc('Y', '1', '0', 'P') /* 10 Greyscale, MIPI RAW10 packed */
+#define V4L2_PIX_FMT_Y12P v4l2_fourcc('Y', '1', '2', 'P') /* 12 Greyscale, MIPI RAW12 packed */
/* Palette formats */
#define V4L2_PIX_FMT_PAL8 v4l2_fourcc('P', 'A', 'L', '8') /* 8 8-bit palette */
|
