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+==================================================
+Display Color Pipeline: Proposed DRM Properties
+==================================================
+
+This is how a typical display color hardware pipeline looks like:
+ +-------------------------------------------+
+ |                RAM                        |
+ |  +------+    +---------+    +---------+   |
+ |  | FB 1 |    |  FB 2   |    | FB N    |   |
+ |  +------+    +---------+    +---------+   |
+ +-------------------------------------------+
+       |  Plane Color Hardware Block |
+ +--------------------------------------------+
+ | +---v-----+   +---v-------+   +---v------+ |
+ | | Plane A |   | Plane B   |   | Plane N  | |
+ | | DeGamma |   | Degamma   |   | Degamma  | |
+ | +---+-----+   +---+-------+   +---+------+ |
+ |     |             |               |        |
+ | +---v-----+   +---v-------+   +---v------+ |
+ | |Plane A  |   | Plane B   |   | Plane N  | |
+ | |CSC/CTM  |   | CSC/CTM   |   | CSC/CTM  | |
+ | +---+-----+   +----+------+   +----+-----+ |
+ |     |              |               |       |
+ | +---v-----+   +----v------+   +----v-----+ |
+ | | Plane A |   | Plane B   |   | Plane N  | |
+ | | Gamma   |   | Gamma     |   | Gamma    | |
+ | +---+-----+   +----+------+   +----+-----+ |
+ |     |              |               |       |
+ +--------------------------------------------+
++------v--------------v---------------v-------|
+||                                           ||
+||           Pipe Blender                    ||
++--------------------+------------------------+
+|                    |                        |
+|        +-----------v----------+             |
+|        |  Pipe DeGamma        |             |
+|        |                      |             |
+|        +-----------+----------+             |
+|                    |            Pipe Color  |
+|        +-----------v----------+ Hardware    |
+|        |  Pipe CSC/CTM        |             |
+|        |                      |             |
+|        +-----------+----------+             |
+|                    |                        |
+|        +-----------v----------+             |
+|        |  Pipe Gamma          |             |
+|        |                      |             |
+|        +-----------+----------+             |
+|                    |                        |
++---------------------------------------------+
+                     |
+                     v
+               Pipe Output
+
+Proposal is to have below properties for a plane:
+
+* Plane Degamma or Pre-Curve:
+	* This will be used to linearize the input framebuffer data.
+	* It will apply the reverse of the color transfer function.
+	* It can be a degamma curve or OETF for HDR.
+	* This linear data can be further acted on by the following
+	* color hardware blocks in the display hardware pipeline
+
+UAPI Name: PLANE_DEGAMMA_MODE
+Description: Enum property with values as blob_id's which advertizes the
+	    possible degamma modes and lut ranges supported by the platform.
+	    This  allows userspace to query and get the plane degamma color
+	    caps and choose the appropriate degamma mode and create lut values
+	    accordingly.
+
+UAPI Name: PLANE_DEGAMMA_LUT
+Description: Blob property which allows a userspace to provide LUT values
+	     to apply degamma curve using the h/w plane degamma processing
+	     engine, thereby making the content as linear for further color
+	     processing. Userspace gets the size of LUT and precision etc
+	     from PLANE_DEGAMA_MODE_PROPERTY
+	
+* Plane CTM
+	* This is a Property to program the color transformation matrix.
+	* This can be used to perform a color space conversion like
+	* BT2020 to BT709 or BT601 etc.
+	* This block is generally kept after the degamma unit so that
+	* linear data can be fed to it for conversion.
+
+UAPI Name: PLANE_CTM
+Description: Blob property which allows a userspace to provide CTM coefficients
+	     to do color space conversion or any other enhancement by doing a
+	     matrix multiplication using the h/w CTM processing engine
+
+* Plane Gamma or Post-Curve
+	* This can be used to perform 2 operations:
+		* non-lineralize the framebuffer data. Can be used for
+		* non linear blending. It can be a gamma curve or EOTF
+		* for HDR.
+		* Perform Tone Mapping operation. This is an operation
+		* done when blending is done with HDR and SDR content.
+
+UAPI Name: PLANE_GAMMA_MODE
+Description: Enum property with values as blob_id's which advertizes the
+	    possible gamma modes and lut ranges supported by the platform.
+	    This  allows userspace to query and get the plane gamma color
+	    caps and choose the appropriate gamma mode and create lut values
+	    accordingly.
+
+UAPI Name: PLANE_GAMMA_LUT
+Description: Blob property which allows a userspace to provide LUT values
+	     to apply gamma curve or perform tone mapping using the h/w plane
+	     gamma processing engine, thereby making the content as linear
+	     for further color processing. Userspace gets the size of LUT and
+	     precision etc from PLANE_GAMA_MODE_PROPERTY
+	
+This is part of one plane engine. Data from multiple planes will be
+then fed to pipe where it will get blended. There is a similar set of
+properties available at crtc level which acts on this blended data.
+
+Below is a sample usecase:
+
+  ┌────────────┐      ┌─────────────┐     ┌─────────────┐     ┌─────────────┐
+  │FB1         │      │Degamma Block│     │ CTM Matrix  │     │ Gamma Block │
+  │            ├─────►│Linearize-   ├────►│ BT709 to    ├────►│ SDR to HDR  │
+  │BT709 SDR   │      │BT709 inverse│     │ BT2020      │     │ Tone Mapping├────────┐
+  └────────────┘      └─────────────┘     └─────────────┘     └─────────────┘        │
+                                                                                     │
+  ┌────────────┐      ┌─────────────┐     ┌─────────────┐     ┌─────────────┐        │
+  │FB2         │      │Degamma Block│     │ CTM Matrix  │     │ Gamma Block │        │
+  │            ├─────►│Linearize-   ├────►│ BT601 to    ├────►│ SDR to HDR  ├─────┐  │
+  │BT601 SDR   │      │BT601 inverse│     │ BT2020      │     │ Tone Mapping│     │  │
+  └────────────┘      └─────────────┘     └─────────────┘     └─────────────┘     │  │
+                                                                                  │  │
+  ┌────────────┐      ┌─────────────┐     ┌─────────────┐     ┌─────────────┐     │  │
+  │FB3         │      │Degamma Block│     │ CTM Matrix  │     │ Gamma Block │     │  │
+  │            ├─────►│Linearize-   ├────►│ NOP (Data in├────►│ NOP (Data in├───┐ │  │
+  │BT2020 HDR  │      │HDR OETF     │     │ BT2020)     │     │ HDR)        │   │ │  │
+  └────────────┘      └─────────────┘     └─────────────┘     └─────────────┘   │ │  │
+                                                                                │ │  │
+                                                                                │ │  │
+                                                                                │ │  │
+┌───────────────────────────────────────────────────────────────────────────────┴─┴──┘
+│
+│ ┌─────────────┐      ┌─────────────┐      ┌───────────────┐
+│ │ CRTC Degamma│      │ CRTC CTM    │      │ CRTC Gamma    │
+└─┤ Use to make ├─────►│ Use for any ├─────►│ Use for Tone  ├─────► TO Port
+  │ data linear │      │ Color Space │      │ Mapping/apply │
+  │ after blend │      │ Conversion  │      │ transfer func │
+  └─────────────┘      └─────────────┘      └───────────────┘
+
+
+This patch series adds properties for plane color features. It adds
+properties for degamma used to linearize data and CSC used for gamut
+conversion. It also includes Gamma support used to again non-linearize
+data as per panel supported color space. These can be utilize by user
+space to convert planes from one format to another, one color space to
+another etc.
+
+Userspace can take smart blending decisions and utilize these hardware
+supported plane color features to get accurate color profile. The same
+can help in consistent color quality from source to panel taking
+advantage of advanced color features in hardware.
+
+These patches add the property interfaces and enable helper functions.
+This series adds Intel's XE_LPD hw specific plane gamma feature. We
+can build up and add other platform/hardware specific implementation
+on top of this series.
+
+Credits: Special mention and credits to Ville Syrjala for coming up
+with a design for this feature and inputs. This series is based on
+his original design and idea.
