git.openwrt.org Git - openwrt/staging/xback.git/blob

   1 From 85e4a24a7f8fd96cc765c038bbae601ca69daa39 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Thu, 7 May 2020 16:59:03 +0100
   4 Subject: [PATCH] media: Add a pixel format for MIPI packed 12bit luma
   5  only.
   6
   7 This is the format used by monochrome 12bit image sensors.
   8
   9 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  10 ---
  11  .../userspace-api/media/v4l/pixfmt-y12p.rst   | 45 +++++++++++++++++++
  12  .../userspace-api/media/v4l/yuv-formats.rst   |  1 +
  13  drivers/media/v4l2-core/v4l2-ioctl.c          |  1 +
  14  include/uapi/linux/videodev2.h                |  1 +
  15  4 files changed, 48 insertions(+)
  16  create mode 100644 Documentation/userspace-api/media/v4l/pixfmt-y12p.rst
  17
  18 --- /dev/null
  19 +++ b/Documentation/userspace-api/media/v4l/pixfmt-y12p.rst
  20 @@ -0,0 +1,45 @@
  21 +.. Permission is granted to copy, distribute and/or modify this
  22 +.. document under the terms of the GNU Free Documentation License,
  23 +.. Version 1.1 or any later version published by the Free Software
  24 +.. Foundation, with no Invariant Sections, no Front-Cover Texts
  25 +.. and no Back-Cover Texts. A copy of the license is included at
  26 +.. Documentation/media/uapi/fdl-appendix.rst.
  27 +..
  28 +.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
  29 +
  30 +.. _V4L2-PIX-FMT-Y12P:
  31 +
  32 +******************************
  33 +V4L2_PIX_FMT_Y12P ('Y12P')
  34 +******************************
  35 +
  36 +Grey-scale image as a MIPI RAW12 packed array
  37 +
  38 +
  39 +Description
  40 +===========
  41 +
  42 +This is a packed grey-scale image format with a depth of 12 bits per
  43 +pixel. Two consecutive pixels are packed into 3 bytes. The first 2 bytes
  44 +contain the 8 high order bits of the pixels, and the 3rd byte contains the 4
  45 +least significants bits of each pixel, in the same order.
  46 +
  47 +**Byte Order.**
  48 +Each cell is one byte.
  49 +
  50 +.. tabularcolumns:: |p{2.2cm}|p{1.2cm}|p{1.2cm}|p{3.1cm}|
  51 +
  52 +
  53 +.. flat-table::
  54 +    :header-rows:  0
  55 +    :stub-columns: 0
  56 +    :widths:       2 1 1 1
  57 +
  58 +
  59 +    -  -  start + 0:
  60 +       -  Y'\ :sub:`00high`
  61 +       -  Y'\ :sub:`01high`
  62 +       -  Y'\ :sub:`01low`\ (bits 7--4)
  63 +
  64 +          Y'\ :sub:`00low`\ (bits 3--0)
  65 +
  66 --- a/Documentation/userspace-api/media/v4l/yuv-formats.rst
  67 +++ b/Documentation/userspace-api/media/v4l/yuv-formats.rst
  68 @@ -28,6 +28,7 @@ to brightness information.
  69      pixfmt-grey
  70      pixfmt-y10
  71      pixfmt-y12
  72 +    pixfmt-y12p
  73      pixfmt-y14
  74      pixfmt-y10b
  75      pixfmt-y10p
  76 --- a/drivers/media/v4l2-core/v4l2-ioctl.c
  77 +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
  78 @@ -1283,6 +1283,7 @@ static void v4l_fill_fmtdesc(struct v4l2
  79         case V4L2_PIX_FMT_Y16_BE:       descr = "16-bit Greyscale BE"; break;
  80         case V4L2_PIX_FMT_Y10BPACK:     descr = "10-bit Greyscale (Packed)"; break;
  81         case V4L2_PIX_FMT_Y10P:         descr = "10-bit Greyscale (MIPI Packed)"; break;
  82 +       case V4L2_PIX_FMT_Y12P:         descr = "12-bit Greyscale (MIPI Packed)"; break;
  83         case V4L2_PIX_FMT_Y8I:          descr = "Interleaved 8-bit Greyscale"; break;
  84         case V4L2_PIX_FMT_Y12I:         descr = "Interleaved 12-bit Greyscale"; break;
  85         case V4L2_PIX_FMT_Z16:          descr = "16-bit Depth"; break;
  86 --- a/include/uapi/linux/videodev2.h
  87 +++ b/include/uapi/linux/videodev2.h
  88 @@ -580,6 +580,7 @@ struct v4l2_pix_format {
  89  /* Grey bit-packed formats */
  90  #define V4L2_PIX_FMT_Y10BPACK    v4l2_fourcc('Y', '1', '0', 'B') /* 10  Greyscale bit-packed */
  91  #define V4L2_PIX_FMT_Y10P    v4l2_fourcc('Y', '1', '0', 'P') /* 10  Greyscale, MIPI RAW10 packed */
  92 +#define V4L2_PIX_FMT_Y12P    v4l2_fourcc('Y', '1', '2', 'P') /* 12  Greyscale, MIPI RAW12 packed */
  93
  94  /* Palette formats */
  95  #define V4L2_PIX_FMT_PAL8    v4l2_fourcc('P', 'A', 'L', '8') /*  8  8-bit palette */