[PATCH 3/8] Documentation/gpu: Add kernel doc entry for DPP

[Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>]

This commit introduces basic DPP information and the struct scan for
code documentation.

Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Harry Wentland <Harry.Wentland@xxxxxxx>
Cc: Hamza Mahfooz <hamza.mahfooz@xxxxxxx>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
---
 .../gpu/amdgpu/display/dcn-blocks.rst         | 12 +++++++++
 drivers/gpu/drm/amd/display/dc/inc/hw/dpp.h   | 26 +++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/Documentation/gpu/amdgpu/display/dcn-blocks.rst b/Documentation/gpu/amdgpu/display/dcn-blocks.rst
index e4e0a4ddca4e..83fc4a03113e 100644
--- a/Documentation/gpu/amdgpu/display/dcn-blocks.rst
+++ b/Documentation/gpu/amdgpu/display/dcn-blocks.rst
@@ -28,3 +28,15 @@ HUBP
 
 .. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h
    :internal:
+
+DPP
+---
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h
+   :doc: overview
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h
+   :export:
+
+.. kernel-doc:: drivers/gpu/drm/amd/display/dc/inc/hw/hubp.h
+   :internal:
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/dpp.h b/drivers/gpu/drm/amd/display/dc/inc/hw/dpp.h
index f4aa76e02518..2c40e253b14e 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/dpp.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/dpp.h
@@ -27,6 +27,32 @@
 #ifndef __DAL_DPP_H__
 #define __DAL_DPP_H__
 
+/**
+ * DOC: overview
+ *
+ * The DPP (Display Pipe and Plane) block is the unified display data
+ * processing engine in DCN for processing graphic or video data on per DPP
+ * rectangle base. This rectangle can be a part of SLS (Single Large Surface),
+ * or a layer to be blended with other DPP, or a rectangle associated with a
+ * display tile.
+ *
+ * It provides various functions including:
+ * - graphic color keyer
+ * - graphic cursor compositing
+ * - graphic or video image source to destination scaling
+ * - image sharping
+ * - video format conversion from 4:2:0 or 4:2:2 to 4:4:4
+ * - Color Space Conversion
+ * - Host LUT gamma adjustment
+ * - Color Gamut Remap
+ * - brightness and contrast adjustment.
+ *
+ * DPP pipe consists of Converter and Cursor (CNVC), Scaler (DSCL), Color
+ * Management (CM), Output Buffer (OBUF) and Digital Bypass (DPB) module
+ * connected in a video/graphics pipeline.
+ */
+
+
 #include "transform.h"
 #include "cursor_reg_cache.h"
 
-- 
2.42.0