[PATCH v2 2/4] Documentation/amdgpu/display: add DC color caps info

Rodrigo Siqueira Jordao Rodrigo.Siqueira at amd.com
Thu Aug 4 22:26:20 UTC 2022



On 2022-08-04 11:01, Melissa Wen wrote:
> Add details about color correction capabilities and explain a bit about
> differences between DC hw generations and also how they are mapped
> between DRM and DC interface. Two schemas for DCN 2.0 and 3.0 (converted
> to svg from the original png) is included to illustrate it. They were
> obtained from a discussion[1] in the amd-gfx mailing list.
> 
> [1] https://lore.kernel.org/amd-gfx/20220422142811.dm6vtk6v64jcwydk@mail.igalia.com/>> 
> v1:
> - remove redundant comments (Harry)
> - fix typos (Harry)
> 
> v2:
> - reword introduction of color section
> - add co-dev tag for Harry - who provided most of the info
> - fix typos (Tales)
> - describe missing struct parameters (Tales and Siqueira)
> 
> Co-developed-by: Harry Wentland <harry.wentland at amd.com>
> Signed-off-by: Harry Wentland <harry.wentland at amd.com>
> Signed-off-by: Melissa Wen <mwen at igalia.com>
> Reviewed-by: Tales Aparecida <tales.aparecida at gmail.com>
> ---
>   .../amdgpu/display/dcn2_cm_drm_current.svg    | 1370 +++++++++++++++
>   .../amdgpu/display/dcn3_cm_drm_current.svg    | 1529 +++++++++++++++++
>   .../gpu/amdgpu/display/display-manager.rst    |   34 +
>   drivers/gpu/drm/amd/display/dc/dc.h           |   77 +-
>   4 files changed, 2997 insertions(+), 13 deletions(-)
>   create mode 100644 Documentation/gpu/amdgpu/display/dcn2_cm_drm_current.svg
>   create mode 100644 Documentation/gpu/amdgpu/display/dcn3_cm_drm_current.svg
> 
> diff --git a/Documentation/gpu/amdgpu/display/dcn2_cm_drm_current.svg b/Documentation/gpu/amdgpu/display/dcn2_cm_drm_current.svg
> new file mode 100644
> index 000000000000..315ffc5a1a4b
> --- /dev/null
> +++ b/Documentation/gpu/amdgpu/display/dcn2_cm_drm_current.svg
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> +       style="stroke-width:0.262672"
> +       inkscape:transform-center-x="-416.72543"
> +       inkscape:transform-center-y="-156.15191" />
> +    <path
> +       d="m 407.9989,1311.6005 c 3.2597,-1.4841 6.4827,-3.0444 9.7556,-4.5048 -3.5093,6.1833 -7.0396,12.3482 -10.5778,18.513 -3.575,-6.1779 -7.1683,-12.3481 -10.7354,-18.5314 3.3569,1.5025 6.685,3.0627 10.0367,4.5731 0,0 0,0 1.5209,-0.05 z"
> +       id="path371636-7-77"
> +       sodipodi:nodetypes="cccccc"
> +       style="stroke-width:0.262672"
> +       inkscape:transform-center-x="-416.72543"
> +       inkscape:transform-center-y="-156.15191" />
> +    <path
> +       d="m 407.9989,1381.5424 c 3.2597,-1.4841 6.4827,-3.0443 9.7556,-4.5048 -3.5093,6.1833 -7.0396,12.3482 -10.5778,18.5131 -3.575,-6.178 -7.1683,-12.3482 -10.7354,-18.5315 3.3569,1.5025 6.685,3.0627 10.0367,4.5731 0,0 0,0 1.5209,-0.05 z"
> +       id="path371636-7-11"
> +       sodipodi:nodetypes="cccccc"
> +       style="stroke-width:0.262672"
> +       inkscape:transform-center-x="-416.72543"
> +       inkscape:transform-center-y="-156.15191" />
> +    <path
> +       d="m 407.9989,1458.6579 c 3.2597,-1.4841 6.4827,-3.0444 9.7556,-4.5049 -3.5093,6.1834 -7.0396,12.3483 -10.5778,18.5131 -3.575,-6.178 -7.1683,-12.3481 -10.7354,-18.5314 3.3569,1.5025 6.685,3.0627 10.0367,4.5731 0,0 0,0 1.5209,-0.05 z"
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> +  </g>
> +</svg>
> diff --git a/Documentation/gpu/amdgpu/display/display-manager.rst b/Documentation/gpu/amdgpu/display/display-manager.rst
> index b1b0f11aed83..88e2c08c7014 100644
> --- a/Documentation/gpu/amdgpu/display/display-manager.rst
> +++ b/Documentation/gpu/amdgpu/display/display-manager.rst
> @@ -49,3 +49,37 @@ Color Management Properties
>   
>   .. kernel-doc:: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
>      :internal:
> +
> +
> +DC Color Capabilities between DCN generations
> +---------------------------------------------
> +
> +DRM/KMS framework defines three CRTC color correction properties: degamma,
> +color transformation matrix (CTM) and gamma, and two properties for degamma and
> +gamma LUT sizes. AMD DC programs some of the color correction features
> +pre-blending but DRM/KMS has not per-plane color correction properties.
> +
> +In general, the DRM CRTC color properties are programmed to DC, as follows:
> +CRTC gamma after blending, and CRTC degamma pre-blending. Although CTM is
> +programmed after blending, it is mapped to DPP hw blocks (pre-blending). Other
> +color caps available in the hw is not currently exposed by DRM interface and
> +are bypassed.
> +
> +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/dc.h
> +   :doc: color-management-caps
> +
> +.. kernel-doc:: drivers/gpu/drm/amd/display/dc/dc.h
> +   :internal:
> +
> +The color pipeline has undergone major changes between DCN hardware
> +generations. What's possible to do before and after blending depends on
> +hardware capabilities, as illustrated below by the DCN 2.0 and DCN 3.0 families
> +schemas.
> +
> +**DCN 2.0 family color caps and mapping**
> +
> +.. kernel-figure:: dcn2_cm_drm_current.svg
> +
> +**DCN 3.0 family color caps and mapping**
> +
> +.. kernel-figure:: dcn3_cm_drm_current.svg
> diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
> index 8e1e40083ec8..8a599aefee35 100644
> --- a/drivers/gpu/drm/amd/display/dc/dc.h
> +++ b/drivers/gpu/drm/amd/display/dc/dc.h
> @@ -118,7 +118,26 @@ struct dc_plane_cap {
>   	uint32_t min_height;
>   };
>   
> -// Color management caps (DPP and MPC)
> +/**
> + * DOC: color-management-caps
> + *
> + * **Color management caps (DPP and MPC)**
> + *
> + * Modules/color calculates various color operations which are translated to
> + * abstracted HW. DCE 5-12 had almost no important changes, but starting with
> + * DCN1, every new generation comes with fairly major differences in color
> + * pipeline. Therefore, we abstract color pipe capabilities so modules/DM can
> + * decide mapping to HW block based on logical capabilities.
> + */
> +
> +/**
> + * struct rom_curve_caps - predefined transfer function caps for degamma and regamma
> + * @srgb: RGB color space transfer func
> + * @bt2020: BT.2020 transfer func
> + * @gamma2_2: standard gamma
> + * @pq: perceptual quantizer transfer function
> + * @hlg: hybrid log–gamma transfer function
> + */
>   struct rom_curve_caps {
>   	uint16_t srgb : 1;
>   	uint16_t bt2020 : 1;
> @@ -127,36 +146,68 @@ struct rom_curve_caps {
>   	uint16_t hlg : 1;
>   };
>   
> +/**
> + * struct dpp_color_caps - color pipeline capabilities for display pipe and
> + * plane blocks
> + *
> + * @dcn_arch: all DCE generations treated the same
> + * @input_lut_shared: shared with DGAM. Input LUT is different than most LUTs,
> + * just plain 256-entry lookup
> + * @icsc: input color space conversion
> + * @dgam_ram: programmable degamma LUT
> + * @post_csc: post color space conversion, before gamut remap
> + * @gamma_corr: degamma correction
> + * @hw_3d_lut: 3D LUT support. It implies a shaper LUT before. It may be shared
> + * with MPC by setting mpc:shared_3d_lut flag
> + * @ogam_ram: programmable out/blend gamma LUT
> + * @ocsc: output color space conversion
> + * @dgam_rom_for_yuv: pre-defined degamma LUT for YUV planes
> + * @dgam_rom_caps: pre-definied curve caps for degamma 1D LUT
> + * @ogam_rom_caps: pre-definied curve caps for regamma 1D LUT
> + *
> + * Note: hdr_mult and gamut remap (CTM) are always available in DPP (in that order)
> + */
>   struct dpp_color_caps {
> -	uint16_t dcn_arch : 1; // all DCE generations treated the same
> -	// input lut is different than most LUTs, just plain 256-entry lookup
> -	uint16_t input_lut_shared : 1; // shared with DGAM
> +	uint16_t dcn_arch : 1;
> +	uint16_t input_lut_shared : 1;
>   	uint16_t icsc : 1;
>   	uint16_t dgam_ram : 1;
> -	uint16_t post_csc : 1; // before gamut remap
> +	uint16_t post_csc : 1;
>   	uint16_t gamma_corr : 1;
> -
> -	// hdr_mult and gamut remap always available in DPP (in that order)
> -	// 3d lut implies shaper LUT,
> -	// it may be shared with MPC - check MPC:shared_3d_lut flag
>   	uint16_t hw_3d_lut : 1;
> -	uint16_t ogam_ram : 1; // blnd gam
> +	uint16_t ogam_ram : 1;
>   	uint16_t ocsc : 1;
>   	uint16_t dgam_rom_for_yuv : 1;
>   	struct rom_curve_caps dgam_rom_caps;
>   	struct rom_curve_caps ogam_rom_caps;
>   };
>   
> +/**
> + * struct mpc_color_caps - color pipeline capabilities for multiple pipe and
> + * plane combined blocks
> + *
> + * @gamut_remap: color transformation matrix
> + * @ogam_ram: programmable out gamma LUT
> + * @ocsc: output color space conversion matrix
> + * @num_3dluts: MPC 3D LUT; always assumes a preceding shaper LUT
> + * @shared_3d_lut: shared 3D LUT flag. Can be either DPP or MPC, but single
> + * instance
> + * @ogam_rom_caps: pre-definied curve caps for regamma 1D LUT
> + */
>   struct mpc_color_caps {
>   	uint16_t gamut_remap : 1;
>   	uint16_t ogam_ram : 1;
>   	uint16_t ocsc : 1;
> -	uint16_t num_3dluts : 3; //3d lut always assumes a preceding shaper LUT
> -	uint16_t shared_3d_lut:1; //can be in either DPP or MPC, but single instance
> -
> +	uint16_t num_3dluts : 3;
> +	uint16_t shared_3d_lut:1;
>   	struct rom_curve_caps ogam_rom_caps;
>   };
>   
> +/**
> + * struct dc_color_caps - color pipes capabilities for DPP and MPC hw blocks
> + * @dpp: color pipes caps for DPP
> + * @mpc: color pipes caps for MPC
> + */
>   struct dc_color_caps {
>   	struct dpp_color_caps dpp;
>   	struct mpc_color_caps mpc;

This also lgtm, but maybe Harry might want to check it.

 From my side,
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>



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