[PATCH 67/70] drm/amd/display: Fix missing dc_3dlut forward declaration

From: Alex Hung <[email protected]>

[WHY]
The __set_colorop_3dlut() prototype in the KUnit-test section of
amdgpu_dm_color.h references struct dc_3dlut, but no forward
declaration for that struct exists in the header.

The forward declaration was originally present but was repurposed
into struct dc_plane_cm when the adjacent amdgpu_dm_atomic_lut3d()
prototype was updated, leaving __set_colorop_3dlut() without a
declaration for struct dc_3dlut.

[HOW]
Add back forward declaration of struct dc_3dlut alongside the other
forward declarations at the top of the header.

Fixes: 67b15f11ae60 ("drm/amd/display: Fix conflicting types for dc_plane_cm functions")
Cc: Alex Hung <[email protected]>
Reviewed-by: Bhawanpreet Lakha <[email protected]>
Signed-off-by: Alex Hung <[email protected]>
Signed-off-by: Wayne Lin <[email protected]>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.h
index 1a8b06bdaf44..cec23a020c3d 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.h
@@ -44,6 +44,7 @@ struct dc_plane_state;
 struct fixed31_32;
 struct tetrahedral_params;
 struct dc_transfer_func;
+struct dc_3dlut;
 
 #if IS_ENABLED(CONFIG_DRM_AMD_DC_KUNIT_TEST)
 /*
-- 
2.43.0