drm/amd/display: add plane HDR multiplier driver-specific property

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Multiplier to 'gain' the plane. When PQ is decoded using the fixed func
transfer function to the internal FP16 fb, 1.0 -> 80 nits (on AMD at
least) When sRGB is decoded, 1.0 -> 1.0.  Therefore, 1.0 multiplier = 80
nits for SDR content. So if you want, 203 nits for SDR content, pass in
(203.0 / 80.0).

v4:
- comment about the PQ TF need for L-to-NL (from Harry's review)

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Joshua Ashton <joshua@froggi.es>
Co-developed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Joshua Ashton 2023-11-16 18:57:48 -01:00 • committed by Alex Deucher

parent e4cddd51bf

commit ec7b2a5546

4 changed files with 40 additions and 0 deletions

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4

drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h

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17

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

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6

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c

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13

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c

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