linux-kernel - [PATCH v3 2/3] docs: media: Document CLL and Mastering display

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Date:   Tue,  8 Dec 2020 16:59:30 +0200
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Cc:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>
Subject: [PATCH v3 2/3] docs: media: Document CLL and Mastering display

Document Content light level and Mastering display colour volume.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
---
 .../userspace-api/media/v4l/common.rst        |  1 +
 .../media/v4l/ext-ctrls-colorimetry.rst       | 88 +++++++++++++++++++
 2 files changed, 89 insertions(+)
 create mode 100644 Documentation/userspace-api/media/v4l/ext-ctrls-colorimetry.rst

diff --git a/Documentation/userspace-api/media/v4l/common.rst b/Documentation/userspace-api/media/v4l/common.rst
index 8c263c5a85d8..ea0435182e44 100644
--- a/Documentation/userspace-api/media/v4l/common.rst
+++ b/Documentation/userspace-api/media/v4l/common.rst
@@ -51,6 +51,7 @@ applicable to all devices.
     ext-ctrls-fm-tx
     ext-ctrls-fm-rx
     ext-ctrls-detect
+    ext-ctrls-colorimetry
     fourcc
     format
     planar-apis
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-colorimetry.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-colorimetry.rst
new file mode 100644
index 000000000000..16d9ddadbab6
--- /dev/null
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-colorimetry.rst
@@ -0,0 +1,88 @@
+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
+
+.. _colorimetry-controls:
+
+*****************************
+Colorimetry Control Reference
+*****************************
+
+Below are controls within the Colorimetry control class.
+
+Colorimetry Control IDs
+-----------------------
+
+.. _colorimetry-control-id:
+
+``V4L2_CID_COLORIMETRY_CLASS (class)``
+    The Colorimetry class descriptor.
+
+``V4L2_CID_COLORIMETRY_HDR10_CLL_INFO (struct)``
+    The Content Light Level defines upper bounds for the nominal target
+    brightness light level of the pictures.
+
+.. c:type:: v4l2_ctrl_hdr10_cll_info
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_hdr10_cll_info
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u16
+      - ``max_content_light_level``
+      - An upper bound on the maximum light level among all individual
+        samples for the pictures of coded video sequence, cd/m2. When
+        equal to 0 no such uppper bound is present.
+    * - __u16
+      - ``max_pic_average_light_level``
+      - An upper bound on the maximum average light level among the
+        samples for any individual picture of coded video sequence, cd/m2.
+        When equal to 0 no such uppper bound is present.
+
+``V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY (struct)``
+    The mastering display defines the colour volume (the colour primaries,
+    white point and luminance range) of a display considered to be the
+    mastering display for current video content.
+
+.. c:type:: v4l2_ctrl_hdr10_mastering_display
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_hdr10_mastering_display
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u16
+      - ``display_primaries_x[3]``
+      - Specifies the normalized x chromaticity coordinate of the colour
+        primary component c of the mastering display in increments of 0.00002.
+        For describing mastering display that use Red, Green and  Blue colour
+        primaries, index value c equal to 0 correspond to Green primary, c
+        equal to 1 correspond to Blue primary and c equal to 2 correspond to
+        Red colour primary.
+    * - __u16
+      - ``display_primaries_y[3]``
+      - Specifies the normalized y chromaticity coordinate of the colour
+        primary component c of the mastering display in increments of 0.00002.
+        For describing mastering display that use Red, Green and  Blue colour
+        primaries, index value c equal to 0 correspond to Green primary, c
+        equal to 1 correspond to Blue primary and c equal to 2 correspond to
+        Red colour primary.
+    * - __u16
+      - ``white_point_x``
+      - Specifies the normalized x chromaticity coordinate of the white
+        point of the mastering display in increments of 0.00002.
+    * - __u16
+      - ``white_point_y``
+      - Specifies the normalized y chromaticity coordinate of the white
+        point of the mastering display in increments of 0.00002.
+    * - __u32
+      - ``max_luminance``
+      - Specifies the nominal maximum display luminance of the mastering
+        display in units of 0.0001 cd/m2.
+    * - __u32
+      - ``min_luminance``
+      - specifies the nominal minimum display luminance of the mastering
+        display in units of 0.0001 cd/m2.
-- 
2.17.1