[PATCH V8 12/43] Documentation/gpu: document drm_colorop

[Alex Hung <alex.hung@amd.com>]

From: Harry Wentland <harry.wentland@amd.com>

Add kernel doc for drm_colorop objects.

Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
---
v8:
 - Move this after "drm/colorop: Introduce DRM_CLIENT_CAP_PLANE_COLOR_PIPELINE" (Simon Ser)
 - Update DOC overview (Simon Ser)

v7:
 - Add a commit messages

v5:
 - Drop TODO

 Documentation/gpu/drm-kms.rst | 15 +++++++++++++++
 drivers/gpu/drm/drm_colorop.c | 31 +++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst
index abfe220764e1..2292e65f044c 100644
--- a/Documentation/gpu/drm-kms.rst
+++ b/Documentation/gpu/drm-kms.rst
@@ -413,6 +413,21 @@ Plane Panic Functions Reference
 .. kernel-doc:: drivers/gpu/drm/drm_panic.c
    :export:
 
+Colorop Abstraction
+===================
+
+.. kernel-doc:: drivers/gpu/drm/drm_colorop.c
+   :doc: overview
+
+Colorop Functions Reference
+---------------------------
+
+.. kernel-doc:: include/drm/drm_colorop.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/drm_colorop.c
+   :export:
+
 Display Modes Function Reference
 ================================
 
diff --git a/drivers/gpu/drm/drm_colorop.c b/drivers/gpu/drm/drm_colorop.c
index 05de9bf118ed..a554c51fa7f5 100644
--- a/drivers/gpu/drm/drm_colorop.c
+++ b/drivers/gpu/drm/drm_colorop.c
@@ -31,6 +31,37 @@
 
 #include "drm_crtc_internal.h"
 
+/**
+ * DOC: overview
+ *
+ * When userspace signals the &DRM_CLIENT_CAP_PLANE_COLOR_PIPELINE it
+ * should use the COLOR_PIPELINE plane property and associated colorops
+ * for any color operation on the &drm_plane. Setting of all old color
+ * properties, such as COLOR_ENCODING and COLOR_RANGE, will be rejected
+ * and the values of the properties will be ignored.
+ *
+ * Colorops are only advertised and valid for atomic drivers and atomic
+ * userspace that signals the &DRM_CLIENT_CAP_PLANE_COLOR_PIPELINE
+ * client cap.
+ *
+ * A colorop represents a single color operation. Colorops are chained
+ * via the NEXT property and make up color pipelines. Color pipelines
+ * are advertised and selected via the COLOR_PIPELINE &drm_plane
+ * property.
+ *
+ * A colorop will be of a certain type, advertised by the read-only TYPE
+ * property. Each type of colorop will advertise a different set of
+ * properties and is programmed in a different manner. Types can be
+ * enumerated 1D curves, 1D LUTs, 3D LUTs, matrices, etc. See the
+ * &drm_colorop_type documentation for information on each type.
+ *
+ * If a colorop advertises the BYPASS property it can be bypassed.
+ *
+ * Information about colorop and color pipeline design decisions can be
+ * found at rfc/color_pipeline.rst, but note that this document will
+ * grow stale over time.
+ */
+
 static const struct drm_prop_enum_list drm_colorop_type_enum_list[] = {
 	{ DRM_COLOROP_1D_CURVE, "1D Curve" },
 };
-- 
2.43.0