diff --git a/Documentation/gpu/rfc/color_intentions.drawio b/Documentation/gpu/rfc/color_intentions.drawio
new file mode 100644
index 000000000000..d62f3b24e1ec
--- /dev/null
+++ b/Documentation/gpu/rfc/color_intentions.drawio
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diff --git a/Documentation/gpu/rfc/color_intentions.svg b/Documentation/gpu/rfc/color_intentions.svg
new file mode 100644
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diff --git a/Documentation/gpu/rfc/colorpipe b/Documentation/gpu/rfc/colorpipe
new file mode 100644
index 000000000000..2d12490eddec
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diff --git a/Documentation/gpu/rfc/colorpipe.svg b/Documentation/gpu/rfc/colorpipe.svg
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index 000000000000..f6b8ece2499d
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diff --git a/Documentation/gpu/rfc/hdr-wide-gamut.rst b/Documentation/gpu/rfc/hdr-wide-gamut.rst
new file mode 100644
index 000000000000..e463670191ab
--- /dev/null
+++ b/Documentation/gpu/rfc/hdr-wide-gamut.rst
@@ -0,0 +1,580 @@
+==============================
+HDR & Wide Color Gamut Support
+==============================
+
+.. role:: wy-text-strike
+
+ToDo
+====
+
+* :wy-text-strike:`Reformat as RST kerneldoc` - done
+* :wy-text-strike:`Don't use color_encoding for color_space definitions` - done
+* :wy-text-strike:`Update SDR luminance description and reasoning` - done
+* :wy-text-strike:`Clarify 3D LUT required for some color space transformations` - done
+* :wy-text-strike:`Highlight need for named color space and EOTF definitions` - done
+* :wy-text-strike:`Define transfer function API` - done
+* :wy-text-strike:`Draft upstream plan` - done
+* :wy-text-strike:`Reference to wayland plan` - done
+* Reference to Chrome plans
+* Sketch view of HW pipeline for couple of HW implementations
+
+
+Upstream Plan
+=============
+
+* Reach consensus on DRM/KMS API
+* Implement support in amdgpu
+* Implement IGT tests
+* Add API support to Weston, ChromiumOS, or other canonical open-source project interested in HDR
+* Merge user-space
+* Merge kernel patches
+
+
+History
+=======
+
+v3:
+
+* Add sections on single-plane and multi-plane HDR
+* Describe approach to define HW details vs approach to define SW intentions
+* Link Jeremy Cline's excellent HDR summaries
+* Outline intention behind overly verbose doc
+* Describe FP16 use-case
+* Clean up links
+
+v2: create this doc
+
+v1: n/a
+
+
+Introduction
+============
+
+We are looking to enable HDR support for a couple of single-plane and
+multi-plane scenarios. To do this effectively we recommend new interfaces
+to drm_plane. Below I'll give a bit of background on HDR and why we
+propose these interfaces.
+
+As an RFC doc this document is more verbose than what we would want from
+an eventual uAPI doc. This is intentional in order to ensure interested
+parties are all on the same page and to facilitate discussion if there
+is disagreement on aspects of the intentions behind the proposed uAPI.
+
+
+Overview and background
+=======================
+
+I highly recommend you read `Jeremy Cline's HDR primer`_
+
+Jeremy Cline did a much better job describing this. I highly recommend
+you read it at [1]:
+
+.. _Jeremy Cline's HDR primer: https://www.jcline.org/blog/fedora/graphics/hdr/2021/05/07/hdr-in-linux-p1.html
+
+Defining a pixel's luminance
+----------------------------
+
+The luminance space of pixels in a framebuffer/plane presented to the
+display is not well defined in the DRM/KMS APIs. It is usually assumed to
+be in a 2.2 or 2.4 gamma space and has no mapping to an absolute luminance
+value; it is interpreted in relative terms.
+
+Luminance can be measured and described in absolute terms as candela
+per meter squared, or cd/m2, or nits. Even though a pixel value can be
+mapped to luminance in a linear fashion to do so without losing a lot of
+detail requires 16-bpc color depth. The reason for this is that human
+perception can distinguish roughly between a 0.5-1% luminance delta. A
+linear representation is suboptimal, wasting precision in the highlights
+and losing precision in the shadows.
+
+A gamma curve is a decent approximation to a human's perception of
+luminance, but the `PQ (perceptual quantizer) function`_ improves on
+it. It also defines the luminance values in absolute terms, with the
+highest value being 10,000 nits and the lowest 0.0005 nits.
+
+Using a content that's defined in PQ space we can approximate the real
+world in a much better way.
+
+Here are some examples of real-life objects and their approximate
+luminance values:
+
+
+.. _PQ (perceptual quantizer) function: https://en.wikipedia.org/wiki/High-dynamic-range_video#Perceptual_Quantizer
+
+.. flat-table::
+   :header-rows: 1
+
+   * - Object
+     - Luminance in nits
+
+   *  - Fluorescent light
+      - 10,000
+
+   *  - Highlights
+      - 1,000 - sunlight
+
+   *  - White Objects
+      - 250 - 1,000
+
+   *  - Typical Objects
+      - 1 - 250
+
+   *  - Shadows
+      - 0.01 - 1
+
+   *  - Ultra Blacks
+      - 0 - 0.0005
+
+
+Transfer functions
+------------------
+
+Traditionally we used the terms gamma and de-gamma to describe the
+encoding of a pixel's luminance value and the operation to transfer from
+a linear luminance space to the non-linear space used to encode the
+pixels. Since some newer encodings don't use a gamma curve I suggest
+we refer to non-linear encodings using the terms `EOTF, and OETF`_, or
+simply as transfer function in general.
+
+The EOTF (Electro-Optical Transfer Function) describes how to transfer
+from an electrical signal to an optical signal. This was traditionally
+done by the de-gamma function.
+
+The OETF (Opto Electronic Transfer Function) describes how to transfer
+from an optical signal to an electronic signal. This was traditionally
+done by the gamma function.
+
+More generally we can name the transfer function describing the transform
+between scanout and blending space as the **input transfer function**, and
+the transfer function describing the transform from blending space to the
+output space as **output transfer function**.
+
+
+.. _EOTF, and OETF: https://en.wikipedia.org/wiki/Transfer_functions_in_imaging
+
+Mastering Luminances
+--------------------
+
+Even though we are able to describe the absolute luminance of a pixel
+using the PQ 2084 EOTF we are presented with physical limitations of the
+display technologies on the market today. Here are a few examples of
+luminance ranges of displays.
+
+.. flat-table::
+   :header-rows: 1
+
+   * - Display
+     - Luminance range in nits
+
+   *  - Typical PC display
+      - 0.3 - 200
+
+   *  - Excellent LCD HDTV
+      - 0.3 - 400
+
+   *  - HDR LCD w/ local dimming
+      - 0.05 - 1,500
+
+Since no display can currently show the full 0.0005 to 10,000 nits
+luminance range of PQ the display will need to tone-map the HDR content,
+i.e to fit the content within a display's capabilities. To assist
+with tone-mapping HDR content is usually accompanied by a metadata
+that describes (among other things) the minimum and maximum mastering
+luminance, i.e. the maximum and minimum luminance of the display that
+was used to master the HDR content.
+
+The HDR metadata is currently defined on the drm_connector via the
+hdr_output_metadata blob property.
+
+It might be useful to define per-plane hdr metadata, as different planes
+might have been mastered differently.
+
+.. _SDR Luminance:
+
+SDR Luminance
+-------------
+
+Traditional SDR content's maximum white luminance is not well defined.
+Some like to define it at 80 nits, others at 200 nits. It also depends
+to a large extent on the environmental viewing conditions. In practice
+this means that we need to define the maximum SDR white luminance, either
+in nits, or as a ratio.
+
+`One Windows API`_ defines it as a ratio against 80 nits.
+
+`Another Windows API`_ defines it as a nits value.
+
+The `Wayland color management proposal`_ uses Apple's definition of EDR as a
+ratio of the HDR range vs SDR range.
+
+If a display's maximum HDR white level is correctly reported it is trivial
+to convert between all of the above representations of SDR white level. If
+it is not, defining SDR luminance as a nits value, or a ratio vs a fixed
+nits value is preferred, assuming we are blending in linear space.
+
+It is our experience that many HDR displays do not report maximum white
+level correctly
+
+.. _One Windows API: https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/dispmprt/ns-dispmprt-_dxgkarg_settargetadjustedcolorimetry2
+.. _Another Windows API: https://docs.microsoft.com/en-us/uwp/api/windows.graphics.display.advancedcolorinfo.sdrwhitelevelinnits?view=winrt-20348
+.. _Wayland color management proposal: https://gitlab.freedesktop.org/swick/wayland-protocols/-/blob/color/unstable/color-management/color.rst#id8
+
+Let There Be Color
+------------------
+
+So far we've only talked about luminance, ignoring colors altogether. Just
+like in the luminance space, traditionally the color space of display
+outputs has not been well defined. Similar to how an EOTF defines a
+mapping of pixel data to an absolute luminance value, the color space
+maps color information for each pixel onto the CIE 1931 chromaticity
+space. This can be thought of as a mapping to an absolute, real-life,
+color value.
+
+A color space is defined by its primaries and white point. The primaries
+and white point are expressed as coordinates in the CIE 1931 color
+space. Think of the red primary as the reddest red that can be displayed
+within the color space. Same for green and blue.
+
+Examples of color spaces are:
+
+.. flat-table::
+   :header-rows: 1
+
+   * - Color Space
+     - Description
+
+   *  - BT 601
+      - similar to BT 709
+
+   *  - BT 709
+      - used by sRGB content; ~53% of BT 2020
+
+   *  - DCI-P3
+      - used by most HDR displays; ~72% of BT 2020
+
+   *  - BT 2020
+      - standard for most HDR content
+
+
+
+Color Primaries and White Point
+-------------------------------
+
+Just like displays can currently not represent the entire 0.0005 -
+10,000 nits HDR range of the PQ 2084 EOTF, they are currently not capable
+of representing the entire BT.2020 color Gamut. For this reason video
+content will often specify the color primaries and white point used to
+master the video, in order to allow displays to be able to map the image
+as best as possible onto the display's gamut.
+
+
+Displays and Tonemapping
+------------------------
+
+External displays are able to do their own tone and color mapping, based
+on the mastering luminance, color primaries, and white space defined in
+the HDR metadata.
+
+Some internal panels might not include the complex HW to do tone and color
+mapping on their own and will require the display driver to perform
+appropriate mapping.
+
+
+How are we solving the problem?
+===============================
+
+Single-plane
+------------
+
+If a single drm_plane is used no further work is required. The compositor
+will provide one HDR plane alongside a drm_connector's hdr_output_metadata
+and the display HW will output this plane without further processing if
+no CRTC LUTs are provided.
+
+If desired a compositor can use the CRTC LUTs for HDR content but without
+support for PWL or multi-segmented LUTs the quality of the operation is
+expected to be subpar for HDR content.
+
+
+Multi-plane
+-----------
+
+In multi-plane configurations we need to solve the problem of blending
+HDR and SDR content. This blending should be done in linear space and
+therefore requires framebuffer data that is presented in linear space
+or a way to convert non-linear data to linear space. Additionally
+we need a way to define the luminance of any SDR content in relation
+to the HDR content.
+
+In order to present framebuffer data in linear space without losing a
+lot of precision it needs to be presented using 16 bpc precision.
+
+
+Defining HW Details
+-------------------
+
+One way to take full advantage of modern HW's color pipelines is by
+defining a "generic" pipeline that matches all capable HW. Something
+like this, which I took `from Uma Shankar`_ and expanded on:
+
+.. _from Uma Shankar: https://patchwork.freedesktop.org/series/90826/
+
+.. kernel-figure::  colorpipe.svg
+
+I intentionally put de-Gamma, and Gamma in parentheses in my graph
+as they describe the intention of the block but not necessarily a
+strict definition of how a userspace implementation is required to
+use them.
+
+De-Gamma and Gamma blocks are named LUT, but they could be non-programmable
+LUTs in some HW implementations with no programmable LUT available. See
+the definitions for AMD's `latest dGPU generation`_ as an example.
+
+.. _latest dGPU generation: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c?h=v5.13#n2586
+
+I renamed the "Plane Gamma LUT" and "CRTC De-Gamma LUT" to "Tonemapping"
+as we generally don't want to re-apply gamma before blending, or do
+de-gamma post blending. These blocks tend generally to be intended for
+tonemapping purposes.
+
+Tonemapping in this case could be a simple nits value or `EDR`_ to describe
+how to scale the :ref:`SDR luminance`.
+
+Tonemapping could also include the ability to use a 3D LUT which might be
+accompanied by a 1D shaper LUT. The shaper LUT is required in order to
+ensure a 3D LUT with limited entries (e.g. 9x9x9, or 17x17x17) operates
+in perceptual (non-linear) space, so as to evenly spread the limited
+entries evenly across the perceived space.
+
+.. _EDR: https://gitlab.freedesktop.org/swick/wayland-protocols/-/blob/color/unstable/color-management/color.rst#id8
+
+Creating a model that is flexible enough to define color pipelines for
+a wide variety of HW is challenging, though not impossible. Implementing
+support for such a flexible definition in userspace, though, amounts
+to essentially writing color pipeline drivers for each HW.
+
+
+Defining SW Intentions
+----------------------
+
+An alternative to describing the HW color pipeline in enough detail to
+be useful for color management and HDR purposes is to instead define
+SW intentions.
+
+.. kernel-figure::  color_intentions.svg
+
+This greatly simplifies the API and lets the driver do what a driver
+does best: figure out how to program the HW to achieve the desired
+effect.
+
+The above diagram could include white point, primaries, and maximum
+peak and average white levels in order to facilitate tone mapping.
+
+At this point I suggest to keep tonemapping (other than an SDR luminance
+adjustment) out of the current DRM/KMS API. Most HDR displays are capable
+of tonemapping. If for some reason tonemapping is still desired on
+a plane, a shader might be a better way of doing that instead of relying
+on display HW.
+
+In some ways this mirrors how various userspace APIs treat HDR:
+ * Gstreamer's `GstVideoTransferFunction`_
+ * EGL's `EGL_EXT_gl_colorspace_bt2020_pq`_ extension
+ * Vulkan's `VkColorSpaceKHR`_
+
+.. _GstVideoTransferFunction: https://gstreamer.freedesktop.org/documentation/video/video-color.html?gi-language=c#GstVideoTransferFunction
+.. _EGL_EXT_gl_colorspace_bt2020_pq: https://www.khronos.org/registry/EGL/extensions/EXT/EGL_EXT_gl_colorspace_bt2020_linear.txt
+.. _VkColorSpaceKHR: https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#VkColorSpaceKHR
+
+
+A hybrid approach to the API
+----------------------------
+
+Our current approach attempts a hybrid approach, defining API to specify
+input and output transfer functions, as well as an SDR boost, and a
+input color space definition.
+
+We would like to solicit feedback and encourage discussion around the
+merits and weaknesses of these approaches. This question is at the core
+of defining a good API and we'd like to get it right.
+
+
+Input and Output Transfer functions
+-----------------------------------
+
+We define an input transfer function on drm_plane to describe the
+transform from framebuffer to blending space.
+
+We define an output transfer function on drm_crtc to describe the
+transform from blending space to display space.
+
+The transfer function can be a pre-defined function, such as PQ EOTF, or
+a custom LUT. A driver will be able to specify support for specific
+transfer functions, including custom ones.
+
+Defining the transfer function in this way allows us to support in on HW
+that uses ROMs to support these transforms, as well as on HW that use
+LUT definitions that are complex and don't map easily onto a standard LUT
+definition.
+
+We will not define per-plane LUTs in this patchset as the scope of our
+current work only deals with pre-defined transfer functions. This API has
+the flexibility to add custom 1D or 3D LUTs at a later date.
+
+In order to support the existing 1D de-gamma and gamma LUTs on the drm_crtc
+we will include a "custom 1D" enum value to indicate that the custom gamma and
+de-gamma 1D LUTs should be used.
+
+Possible transfer functions:
+
+.. flat-table::
+   :header-rows: 1
+
+   * - Transfer Function
+     - Description
+
+   *  - Gamma 2.2
+      - a simple 2.2 gamma function
+
+   *  - sRGB
+      - 2.4 gamma with small initial linear section
+
+   *  - PQ 2084
+      - SMPTE ST 2084; used for HDR video and allows for up to 10,000 nit support
+
+   *  - Linear
+      - Linear relationship between pixel value and luminance value
+
+   *  - Custom 1D
+      - Custom 1D de-gamma and gamma LUTs; one LUT per color
+
+   *  - Custom 3D
+      - Custom 3D LUT (to be defined)
+
+
+Describing SDR Luminance
+------------------------------
+
+Since many displays do no correctly advertise the HDR white level we
+propose to define the SDR white level in nits.
+
+We define a new drm_plane property to specify the white level of an SDR
+plane.
+
+
+Defining the color space
+------------------------
+
+We propose to add a new color space property to drm_plane to define a
+plane's color space.
+
+While some color space conversions can be performed with a simple color
+transformation matrix (CTM) others require a 3D LUT.
+
+
+Defining mastering color space and luminance
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+ToDo
+
+
+
+Pixel Formats
+~~~~~~~~~~~~~
+
+The pixel formats, such as ARGB8888, ARGB2101010, P010, or FP16 are
+unrelated to color space and EOTF definitions. HDR pixels can be formatted
+in different ways but in order to not lose precision HDR content requires
+at least 10 bpc precision. For this reason ARGB2101010, P010, and FP16 are
+the obvious candidates for HDR. ARGB2101010 and P010 have the advantage
+of requiring only half the bandwidth as FP16, while FP16 has the advantage
+of enough precision to operate in a linear space, i.e. without EOTF.
+
+
+Use Cases
+=========
+
+RGB10 HDR plane - composited HDR video & desktop
+------------------------------------------------
+
+A single, composited plane of HDR content. The use-case is a video player
+on a desktop with the compositor owning the composition of SDR and HDR
+content. The content shall be PQ BT.2020 formatted. The drm_connector's
+hdr_output_metadata shall be set.
+
+
+P010 HDR video plane + RGB8 SDR desktop plane
+---------------------------------------------
+A normal 8bpc desktop plane, with a P010 HDR video plane underlayed. The
+HDR plane shall be PQ BT.2020 formatted. The desktop plane shall specify
+an SDR boost value. The drm_connector's hdr_output_metadata shall be set.
+
+
+One XRGB8888 SDR Plane - HDR output
+-----------------------------------
+
+In order to support a smooth transition we recommend an OS that supports
+HDR output to provide the hdr_output_metadata on the drm_connector to
+configure the output for HDR, even when the content is only SDR. This will
+allow for a smooth transition between SDR-only and HDR content. In this
+use-case the SDR max luminance value should be provided on the drm_plane.
+
+In DCN we will de-PQ or de-Gamma all input in order to blend in linear
+space. For SDR content we will also apply any desired boost before
+blending. After blending we will then re-apply the PQ EOTF and do RGB
+to YCbCr conversion if needed.
+
+FP16 HDR linear planes
+----------------------
+
+These will require a transformation into the display's encoding (e.g. PQ)
+using the CRTC LUT. Current CRTC LUTs are lacking the precision in the
+dark areas to do the conversion without losing detail.
+
+One of the newly defined output transfer functions or a PWL or `multi-segmented
+LUT`_ can be used to facilitate the conversion to PQ, HLG, or another
+encoding supported by displays.
+
+.. _multi-segmented LUT: https://patchwork.freedesktop.org/series/90822/
+
+
+User Space
+==========
+
+Gnome & GStreamer
+-----------------
+
+See Jeremy Cline's `HDR in Linux\: Part 2`_.
+
+.. _HDR in Linux\: Part 2: https://www.jcline.org/blog/fedora/graphics/hdr/2021/06/28/hdr-in-linux-p2.html
+
+
+Wayland
+-------
+
+See `Wayland Color Management and HDR Design Goals`_.
+
+.. _Wayland Color Management and HDR Design Goals: https://gitlab.freedesktop.org/swick/wayland-protocols/-/blob/color/unstable/color-management/color.rst
+
+
+ChromeOS Ozone
+--------------
+
+ToDo
+
+
+HW support
+==========
+
+ToDo, describe pipeline on a couple different HW platforms
+
+
+Further Reading
+===============
+
+* https://gitlab.freedesktop.org/swick/wayland-protocols/-/blob/color/unstable/color-management/color.rst
+* http://downloads.bbc.co.uk/rd/pubs/whp/whp-pdf-files/WHP309.pdf
+* https://app.spectracal.com/Documents/White%20Papers/HDR_Demystified.pdf
+* https://www.jcline.org/blog/fedora/graphics/hdr/2021/05/07/hdr-in-linux-p1.html
+* https://www.jcline.org/blog/fedora/graphics/hdr/2021/06/28/hdr-in-linux-p2.html
+
+
diff --git a/Documentation/gpu/rfc/index.rst b/Documentation/gpu/rfc/index.rst
index 05670442ca1b..8d8430cfdde1 100644
--- a/Documentation/gpu/rfc/index.rst
+++ b/Documentation/gpu/rfc/index.rst
@@ -19,3 +19,4 @@ host such documentation:
 .. toctree::
 
     i915_gem_lmem.rst
+    hdr-wide-gamut.rst
