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

Rodrigo Siqueira Jordao Rodrigo.Siqueira at amd.com
Wed Jul 27 21:21:48 UTC 2022



On 2022-07-17 19:28, Tales Lelo da Aparecida wrote:
> On 16/07/2022 19:25, 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/ 
>>
>>
>> v2:
>>
>> - remove redundant comments (Harry)
>> - fix typo (Harry)
>>
>> Signed-off-by: Melissa Wen <mwen at igalia.com>
>> ---
>>   .../amdgpu/display/dcn2_cm_drm_current.svg    | 1370 +++++++++++++++
>>   .../amdgpu/display/dcn3_cm_drm_current.svg    | 1529 +++++++++++++++++
>>   .../gpu/amdgpu/display/display-manager.rst    |   35 +
>>   drivers/gpu/drm/amd/display/dc/dc.h           |   74 +-
>>   4 files changed, 2995 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
>> @@ -0,0 +1,1370 @@
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>> +       xml:space="preserve"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="1417.9988"
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>> +         sodipodi:role="line"
>> +         id="tspan78851"
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>> +         style="font-size:18.6667px">Degamma</tspan></text>
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>> +       xml:space="preserve"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="1451.9988"
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>> +         id="tspan78855"
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>> +         style="font-size:18.6667px">CTM</tspan></text>
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="1427.9988"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="949.99878"
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>> +         id="tspan104651"
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>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="911.99878"
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>> +         id="tspan104655"
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>> +       xml:space="preserve"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="887.99878"
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>> +         sodipodi:role="line"
>> +         id="tspan104659"
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>> +         style="font-size:18.6667px">color space matrix</tspan></text>
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>> +       xml:space="preserve"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="871.99878"
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>> +         id="tspan104663"
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>> style="font-size:18.6667px">input_csc_color_matrix</tspan></text>
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>> +       xml:space="preserve"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="905.99878"
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>> +         sodipodi:role="line"
>> +         id="tspan125073"
>> +         x="905.99878"
>> +         y="586.74976"
>> +         style="font-size:18.6667px">in_transfer_func</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="945.0083"
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>> +       id="text117309"><tspan
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>> +         id="tspan117307"
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>> +         style="font-size:18.6667px">hdr_mult</tspan></text>
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>> +       xml:space="preserve"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="874.5556"
>> +       y="773.42615"
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>> +         sodipodi:role="line"
>> +         id="tspan117307-7"
>> +         x="874.5556"
>> +         y="773.42615"
>> +         style="font-size:18.6667px">gamut_remap_matrix</tspan></text>
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>> +       xml:space="preserve"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="913.72528"
>> +       y="846.55896"
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>> +         sodipodi:role="line"
>> +         id="tspan117307-3"
>> +         x="913.72528"
>> +         y="846.55896"
>> +         style="font-size:18.6667px">in_shaper_func</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="937.72528"
>> +       y="918.25787"
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>> +         sodipodi:role="line"
>> +         id="tspan117307-2"
>> +         x="937.72528"
>> +         y="918.25787"
>> +         style="font-size:18.6667px">lut3d_func</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="945.9895"
>> +       y="986.10767"
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>> +         sodipodi:role="line"
>> +         id="tspan117307-1"
>> +         x="945.9895"
>> +         y="986.10767"
>> +         style="font-size:18.6667px">blend_tf</tspan></text>
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>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="975.91803"
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>> +       id="text137434"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan137432"
>> +         x="975.91803"
>> +         y="1224.5564"
>> +         style="font-size:18.6667px">Blender</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="879.31372"
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>> +         sodipodi:role="line"
>> +         id="tspan137432-7"
>> +         x="879.31372"
>> +         y="1283.4249"
>> +         style="font-size:18.6667px">gamut_remap_matrix</tspan></text>
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>> +       xml:space="preserve"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="925.31372"
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>> +         sodipodi:role="line"
>> +         id="tspan137432-9"
>> +         x="925.31372"
>> +         y="1359.2747"
>> +         style="font-size:18.6667px">func_shaper</tspan></text>
>> +    <text
>> +       xml:space="preserve"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="930.33252"
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>> +         sodipodi:role="line"
>> +         id="tspan137432-6"
>> +         x="930.33252"
>> +         y="1430.2566"
>> +         style="font-size:18.6667px">lut3d_func</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="900.18158"
>> +       y="1504.6725"
>> +       id="text137434-06"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan137432-2"
>> +         x="900.18158"
>> +         y="1504.6725"
>> +         style="font-size:18.6667px">out_transfer_func</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="904.0307"
>> +       y="1575.8053"
>> +       id="text137434-6"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan137432-1"
>> +         x="904.0307"
>> +         y="1575.8053"
>> +         style="font-size:18.6667px">csc_color_matrix</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="903.16278"
>> +       y="1642.1078"
>> +       id="text137434-8"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan137432-79"
>> +         x="903.16278"
>> +         y="1642.1078"
>> +         style="font-size:18.6667px">bit_depth_param</tspan></text>
>> +    <text
>> +       xml:space="preserve"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="939.31372"
>> +       y="1713.8068"
>> +       id="text137434-20"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan137432-23"
>> +         x="939.31372"
>> +         y="1713.8068"
>> +         style="font-size:18.6667px">clamping</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="894.0307"
>> +       y="1782.5244"
>> +       id="text137434-7"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan137432-5"
>> +         x="894.0307"
>> +         y="1782.5244"
>> +         style="font-size:18.6667px">output_color_space</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="869.63062"
>> +       y="117.7968"
>> +       id="text176429"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan176427"
>> +         x="869.63062"
>> +         y="117.7968"
>> +         style="font-size:18.6667px">Plane</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="27.605465"
>> +       y="162.20587"
>> +       id="text176429-2"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan176427-0"
>> +         x="27.605465"
>> +         y="162.20587"
>> +         style="font-size:18.6667px">Legend</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="298.63959"
>> +       y="59.293999"
>> +       id="text176429-9"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan176427-2"
>> +         x="298.63959"
>> +         y="59.293999"
>> +         style="font-size:18.6667px">DCN 2.0</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="826.65735"
>> +       y="59.458061"
>> +       id="text176429-66"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan176427-4"
>> +         x="826.65735"
>> +         y="59.458061"
>> +         style="font-size:18.6667px">DC Interface</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="1362.9948"
>> +       y="59.458061"
>> +       id="text176429-95"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan176427-04"
>> +         x="1362.9948"
>> +         y="59.458061"
>> +         style="font-size:18.6667px">DRM Interface</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:40px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="867.34656"
>> +       y="1194.5068"
>> +       id="text184728"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan184726"
>> +         x="867.34656"
>> +         y="1194.5068" /></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="389.01593"
>> +       y="159.8909"
>> +       id="text64469-9-3"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-6"
>> +         x="389.01593"
>> +         y="159.8909"
>> +         style="font-size:18.6667px">CNVC</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="365.88379"
>> +       y="303.59048"
>> +       id="text64469-9-1"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-2"
>> +         x="365.88379"
>> +         y="303.59048"
>> +         style="font-size:18.6667px">Input CSC</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="409.06488"
>> +       y="404.95001"
>> +       id="text64469-9-93"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-1"
>> +         x="409.06488"
>> +         y="404.95001"
>> +         
>> style="font-size:18.6667px;text-align:center;text-anchor:middle">DeGamma</tspan><tspan 
>>
>> +         sodipodi:role="line"
>> +         x="409.06488"
>> +         y="428.28339"
>> +         
>> style="font-size:18.6667px;text-align:center;text-anchor:middle"
>> +         id="tspan233797">RAM and ROM</tspan><tspan
>> +         sodipodi:role="line"
>> +         x="409.06488"
>> +         y="451.61676"
>> +         
>> style="font-size:10.6667px;text-align:center;text-anchor:middle"
>> +         id="tspan242597">(sRGB, BT2020</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="351.16684"
>> +       y="700.34918"
>> +       id="text64469-9-0"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-3"
>> +         x="351.16684"
>> +         y="700.34918"
>> +         style="font-size:18.6667px">HDR Multiply</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="345.16684"
>> +       y="771.33112"
>> +       id="text64469-9-6"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-10"
>> +         x="345.16684"
>> +         y="771.33112"
>> +         style="font-size:18.6667px">Gamut Remap</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="412.5184"
>> +       y="836.04877"
>> +       id="text64469-9-63"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-20"
>> +         x="412.5184"
>> +         y="836.04877"
>> +         
>> style="font-size:18.6667px;text-align:center;text-anchor:middle">Shaper LUT</tspan><tspan 
>>
>> +         sodipodi:role="line"
>> +         x="412.5184"
>> +         y="859.38214"
>> +         
>> style="font-size:18.6667px;text-align:center;text-anchor:middle"
>> +         id="tspan222533">RAM</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="413.54086"
>> +       y="908.61554"
>> +       id="text64469-9-61"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-55"
>> +         x="413.54086"
>> +         y="908.61554"
>> +         
>> style="font-size:18.6667px;text-align:center;text-anchor:middle">3D 
>> LUT</tspan><tspan
>> +         sodipodi:role="line"
>> +         x="413.54086"
>> +         y="931.94891"
>> +         
>> style="font-size:18.6667px;text-align:center;text-anchor:middle"
>> +         id="tspan221121">RAM</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="344.0347"
>> +       y="985.33319"
>> +       id="text64469-9-47"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-65"
>> +         x="344.0347"
>> +         y="985.33319"
>> +         style="font-size:18.6667px">Blend Gamma</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="433.84625"
>> +       y="1223.411"
>> +       id="text64469-9-69"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-37"
>> +         x="433.84625"
>> +         y="1223.411"
>> +         style="font-size:18.6667px">Blender</tspan></text>
>> +    <text
>> +       xml:space="preserve"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
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>>
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>>
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
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>>
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>>
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="298.63959"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
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>> style="font-style:normal;font-weight:normal;font-size:40px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="867.34656"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="389.01593"
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>> +         id="tspan64467-2-6"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="365.88379"
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>> +       id="text64469-9-1"><tspan
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>> +         id="tspan64467-2-2"
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>> +         style="font-size:18.6667px">Input CSC</tspan></text>
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="413.06488"
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>> +         id="tspan64467-2-1"
>> +         x="413.06488"
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>> style="font-size:18.6667px;text-align:center;text-anchor:middle">DeGamma</tspan><tspan 
>>
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>> +         x="413.06488"
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>> style="font-size:18.6667px;text-align:center;text-anchor:middle"
>> +         id="tspan233797">ROM</tspan><tspan
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>> style="font-size:10.6667px;text-align:center;text-anchor:middle"
>> +         id="tspan233799">(sRGB, BT2020, Gamma 2.2,</tspan><tspan
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>> +         x="413.06488"
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>> style="font-size:10.6667px;text-align:center;text-anchor:middle"
>> +         id="tspan242597">PQ, HLG)</tspan></text>
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="372.44986"
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>> +       id="text64469-9-94"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-78"
>> +         x="372.44986"
>> +         y="538.83807"
>> +         style="font-size:18.6667px">Post CSC</tspan></text>
>> +    <text
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>> style="font-style:normal;font-weight:normal;font-size:16px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="335.31775"
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>> +       id="text64469-9-4"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-5"
>> +         x="335.31775"
>> +         y="622.23511"
>> +         style="font-size:16px">Gamma Correction</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="351.16684"
>> +       y="700.34918"
>> +       id="text64469-9-0"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-3"
>> +         x="351.16684"
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>> +         style="font-size:18.6667px">HDR Multiply</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="345.16684"
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>> +       id="text64469-9-6"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-10"
>> +         x="345.16684"
>> +         y="771.33112"
>> +         style="font-size:18.6667px">Gamut Remap</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="412.5184"
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>> +       id="text64469-9-63"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-20"
>> +         x="412.5184"
>> +         y="836.04877"
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>> style="font-size:18.6667px;text-align:center;text-anchor:middle">Shaper LUT</tspan><tspan 
>>
>> +         sodipodi:role="line"
>> +         x="412.5184"
>> +         y="859.38214"
>> +         
>> style="font-size:18.6667px;text-align:center;text-anchor:middle"
>> +         id="tspan222533">RAM</tspan></text>
>> +    <text
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="413.54086"
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>> +       id="text64469-9-61"><tspan
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>> +         id="tspan64467-2-55"
>> +         x="413.54086"
>> +         y="908.61554"
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>> style="font-size:18.6667px;text-align:center;text-anchor:middle">3D 
>> LUT</tspan><tspan
>> +         sodipodi:role="line"
>> +         x="413.54086"
>> +         y="931.94891"
>> +         
>> style="font-size:18.6667px;text-align:center;text-anchor:middle"
>> +         id="tspan221121">RAM</tspan></text>
>> +    <text
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="344.0347"
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>> +       id="text64469-9-47"><tspan
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>> +         id="tspan64467-2-65"
>> +         x="344.0347"
>> +         y="985.33319"
>> +         style="font-size:18.6667px">Blend Gamma</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="433.84625"
>> +       y="1223.411"
>> +       id="text64469-9-69"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-37"
>> +         x="433.84625"
>> +         y="1223.411"
>> +         style="font-size:18.6667px">Blender</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="343.73291"
>> +       y="1290.2421"
>> +       id="text64469-9-45"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-25"
>> +         x="343.73291"
>> +         y="1290.2421"
>> +         style="font-size:18.6667px">Gamut Remap</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="408.74442"
>> +       y="1344.2428"
>> +       id="text64469-9-474"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-4"
>> +         x="408.74442"
>> +         y="1344.2428"
>> +         
>> style="font-size:18.6667px;text-align:center;text-anchor:middle">Shaper LUT</tspan><tspan 
>>
>> +         sodipodi:role="line"
>> +         x="408.74442"
>> +         y="1367.5762"
>> +         
>> style="font-size:18.6667px;text-align:center;text-anchor:middle"
>> +         id="tspan208303">RAM</tspan></text>
>> +    <text
>> +       xml:space="preserve"
>> +       
>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="407.1257"
>> +       y="1420.2435"
>> +       id="text64469-9-30"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-786"
>> +         x="407.1257"
>> +         y="1420.2435"
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>> style="font-size:18.6667px;text-align:center;text-anchor:middle">3D 
>> LUT</tspan><tspan
>> +         sodipodi:role="line"
>> +         x="407.1257"
>> +         y="1443.5769"
>> +         
>> style="font-size:18.6667px;text-align:center;text-anchor:middle"
>> +         id="tspan204749">RAM</tspan></text>
>> +    <text
>> +       xml:space="preserve"
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="408.64996"
>> +       y="1492.8102"
>> +       id="text64469-9-8"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-84"
>> +         x="408.64996"
>> +         y="1492.8102"
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>> style="font-size:18.6667px;text-align:center;text-anchor:middle">Gamma</tspan><tspan 
>>
>> +         sodipodi:role="line"
>> +         x="408.64996"
>> +         y="1516.1436"
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>> style="font-size:18.6667px;text-align:center;text-anchor:middle"
>> +         id="tspan197733">RAM</tspan></text>
>> +    <text
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>> style="font-style:normal;font-weight:normal;font-size:18.6667px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="385.46863"
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>> +       id="text64469-9-31"><tspan
>> +         sodipodi:role="line"
>> +         id="tspan64467-2-49"
>> +         x="385.46863"
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>> +         style="font-size:18.6667px">OCSC</tspan></text>
>> +    <text
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>> style="font-style:normal;font-weight:normal;font-size:40px;line-height:1.25;font-family:sans-serif;fill:#000000;fill-opacity:1;stroke:none" 
>>
>> +       x="1356.5106"
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>> +       id="text273287"><tspan
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>>
>> +       x="1411.7203"
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>> +         id="tspan78839"
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>> style="fill:#f9f7ed;fill-opacity:1;stroke:#000000;stroke-opacity:1"
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>> +       width="175.11876"
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>>
>> +       x="1399.212"
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>> +       id="text78845"><tspan
>> +         sodipodi:role="line"
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>> style="fill:#f9f7ed;fill-opacity:1;stroke:#000000;stroke-opacity:1"
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>> diff --git a/Documentation/gpu/amdgpu/display/display-manager.rst 
>> b/Documentation/gpu/amdgpu/display/display-manager.rst
>> index b1b0f11aed83..8960a5f1fa66 100644
>> --- a/Documentation/gpu/amdgpu/display/display-manager.rst
>> +++ b/Documentation/gpu/amdgpu/display/display-manager.rst
>> @@ -49,3 +49,38 @@ 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
> 
> Abbreviations should be written as all-uppercase
> https://docs.kernel.org/gpu/introduction.html?highlight=uppercase#style-guidelines 
> 
> 
>> +gamma lut sizes. AMD DC programs some of the color correction features
>> +pre-blending but DRM/KMS has not per-plane color correction properties.
>> +
>> +What's possible to do before and after blending has changed quite a 
>> bit between
>> +DCN generations as it depends on hardware color capabilities. DPP and 
>> MPC color
>> +correction caps are described below.
>> +
>> +.. 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:
>> +
>> +In general, the DRM three properties are programed to DC, as follows: 
>> CRT > +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 by
>> +passed.  To illustrate DCN generation capabilities and differences 
>> between
> 
> possible typo: "by\npassed" -> "bypassed"
> 
>> +them, you can compare the color management schemas for DCN 2.0 and 
>> DCN 3.0
>> +families below.
>> +
>> +**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 7c42377f0aae..84275f3974c1 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 colour operations which are 
>> translated to
> 
> Nit: colour -> color
> The DRM documentation has a **preference** for the american spelling 
> https://www.kernel.org/doc/html/latest/gpu/introduction.html?highlight=American%20English#style-guidelines 
> 
> 
>> + * 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 +146,65 @@ 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
> 
> ./drivers/gpu/drm/amd/display/dc/dc.h:181: warning: Function parameter 
> or member 'dgam_ram' not described in 'dpp_color_caps'

Hi,

I was trying to figure out the meaning of some of these fields.


First of all, and in the LUT context, notice that some fields have the 
prefix _ram, and others have _rom. When you see the ram, it means that 
we have a hardware LUT in the device, and we can program its values. If 
you see rom, it also means that we have hardware LUT but have 
pre-hardcoded values, which means that we can only select between a few 
of them (e.g., sRGB, PQ, etc.). I guess ROM is preferable since it 
requires less configuration.

> 
>> + * @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: blend gamma

dgam refers to 'degamma'

and

ogam to 'out gamma'.


>> + * @ocsc: output color space conversion
> 
> ./drivers/gpu/drm/amd/display/dc/dc.h:181: warning: Function parameter 
> or member 'dgam_rom_for_yuv' not described in 'dpp_color_caps'

dgam_rom_for_yuv -> I don't know precisely why we have this, but since 
DCN3 introduced it, I guess this is a specific behavior to compute yuv.

afaik, this caps stands for capabilities, i.e., dpp_color_caps describes 
the DPP color capabilities configured for the specific hardware and setup.

Best Regards
Siqueira

> 
>> + * @dgam_rom_caps: caps for degamma
>> + * @ogam_rom_caps: 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
> 
> ./drivers/gpu/drm/amd/display/dc/dc.h:201: warning: Function parameter 
> or member 'ogam_ram' not described in 'mpc_color_caps'
> 
>> + * @ocsc: output color space conversion matrix
>> + * @num_3dluts: 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: caps for regama 1d lut
> 
> typo: regama -> regamma
> 
>> + */
>>   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;
> 
> 
> Again, thanks for the documentation patch!
> 
> Kind regards,
> Tales Aparecida



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