target/linux/bcm27xx/patches-5.15/950-0219-media-uapi-v4l2-core-Add-ISP-statistics-output-V4L2-.patch

   1 From 6b4ccbece097b456c2fb910d7e74ac5e848dc699 Mon Sep 17 00:00:00 2001
   2 From: Naushir Patuck <naush@raspberrypi.com>
   3 Date: Thu, 23 Apr 2020 10:20:26 +0100
   4 Subject: [PATCH] media: uapi: v4l2-core: Add ISP statistics output
   5  V4L2 fourcc type
   6
   7 Add V4L2_META_FMT_BCM2835_ISP_STATS V4L2 format type.
   8
   9 This new format will be used by the BCM2835 ISP device to return
  10 out ISP statistics for 3A.
  11
  12 Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
  13 ---
  14  .../userspace-api/media/v4l/meta-formats.rst  |  1 +
  15  .../v4l/pixfmt-meta-bcm2835-isp-stats.rst     | 41 +++++++++++++++++++
  16  drivers/media/v4l2-core/v4l2-ioctl.c          |  1 +
  17  include/uapi/linux/videodev2.h                |  1 +
  18  4 files changed, 44 insertions(+)
  19  create mode 100644 Documentation/userspace-api/media/v4l/pixfmt-meta-bcm2835-isp-stats.rst
  20
  21 --- a/Documentation/userspace-api/media/v4l/meta-formats.rst
  22 +++ b/Documentation/userspace-api/media/v4l/meta-formats.rst
  23 @@ -12,6 +12,7 @@ These formats are used for the :ref:`met
  24  .. toctree::
  25      :maxdepth: 1
  26
  27 +    pixfmt-meta-bcm2835-isp-stats
  28      pixfmt-meta-d4xx
  29      pixfmt-meta-intel-ipu3
  30      pixfmt-meta-rkisp1
  31 --- /dev/null
  32 +++ b/Documentation/userspace-api/media/v4l/pixfmt-meta-bcm2835-isp-stats.rst
  33 @@ -0,0 +1,41 @@
  34 +.. Permission is granted to copy, distribute and/or modify this
  35 +.. document under the terms of the GNU Free Documentation License,
  36 +.. Version 1.1 or any later version published by the Free Software
  37 +.. Foundation, with no Invariant Sections, no Front-Cover Texts
  38 +.. and no Back-Cover Texts. A copy of the license is included at
  39 +.. Documentation/media/uapi/fdl-appendix.rst.
  40 +..
  41 +.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
  42 +
  43 +.. _v4l2-meta-fmt-bcm2835-isp-stats:
  44 +
  45 +*****************************************
  46 +V4L2_META_FMT_BCM2835_ISP_STATS  ('BSTA')
  47 +*****************************************
  48 +
  49 +BCM2835 ISP Statistics
  50 +
  51 +Description
  52 +===========
  53 +
  54 +The BCM2835 ISP hardware calculate image statistics for an input Bayer frame.
  55 +These statistics are obtained from the "bcm2835-isp0-capture3" device node
  56 +using the :c:type:`v4l2_meta_format` interface. They are formatted as described
  57 +by the :c:type:`bcm2835_isp_stats` structure below.
  58 +
  59 +.. code-block:: c
  60 +
  61 +       #define DEFAULT_AWB_REGIONS_X 16
  62 +       #define DEFAULT_AWB_REGIONS_Y 12
  63 +
  64 +       #define NUM_HISTOGRAMS 2
  65 +       #define NUM_HISTOGRAM_BINS 128
  66 +       #define AWB_REGIONS (DEFAULT_AWB_REGIONS_X * DEFAULT_AWB_REGIONS_Y)
  67 +       #define FLOATING_REGIONS 16
  68 +       #define AGC_REGIONS 16
  69 +       #define FOCUS_REGIONS 12
  70 +
  71 +.. kernel-doc:: include/uapi/linux/bcm2835-isp.h
  72 +   :functions: bcm2835_isp_stats_hist bcm2835_isp_stats_region
  73 +                    bcm2835_isp_stats_focus bcm2835_isp_stats
  74 +
  75 --- a/drivers/media/v4l2-core/v4l2-ioctl.c
  76 +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
  77 @@ -1390,6 +1390,7 @@ static void v4l_fill_fmtdesc(struct v4l2
  78         case V4L2_META_FMT_RK_ISP1_PARAMS:      descr = "Rockchip ISP1 3A Parameters"; break;
  79         case V4L2_META_FMT_RK_ISP1_STAT_3A:     descr = "Rockchip ISP1 3A Statistics"; break;
  80         case V4L2_META_FMT_SENSOR_DATA: descr = "Sensor Ancillary Metadata"; break;
  81 +       case V4L2_META_FMT_BCM2835_ISP_STATS: descr = "BCM2835 ISP Image Statistics"; break;
  82
  83         default:
  84                 /* Compressed formats */
  85 --- a/include/uapi/linux/videodev2.h
  86 +++ b/include/uapi/linux/videodev2.h
  87 @@ -776,6 +776,7 @@ struct v4l2_pix_format {
  88  #define V4L2_META_FMT_D4XX        v4l2_fourcc('D', '4', 'X', 'X') /* D4XX Payload Header metadata */
  89  #define V4L2_META_FMT_VIVID      v4l2_fourcc('V', 'I', 'V', 'D') /* Vivid Metadata */
  90  #define V4L2_META_FMT_SENSOR_DATA v4l2_fourcc('S', 'E', 'N', 'S') /* Sensor Ancillary metadata */
  91 +#define V4L2_META_FMT_BCM2835_ISP_STATS v4l2_fourcc('B', 'S', 'T', 'A') /* BCM2835 ISP image statistics output */
  92
  93  /* Vendor specific - used for RK_ISP1 camera sub-system */
  94  #define V4L2_META_FMT_RK_ISP1_PARAMS   v4l2_fourcc('R', 'K', '1', 'P') /* Rockchip ISP1 3A Parameters */