drm/amd/display: Enable support for Gamma 2.2

This patchset enables support for the Gamma 2.2.

With this patch the following IGT subtests pass:

kms_colorop --run plane-XR30-XR30-gamma_2_2

kms_colorop --run plane-XR30-XR30-gamma_2_2_inv-gamma_2_2

kms_colorop --run plane-XR30-XR30-gamma_2_2_inv-gamma_2_2-gamma_2_2_inv

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Simon Ser <contact@emersion.fr>
Link: https://patch.msgid.link/20251115000237.3561250-52-alex.hung@amd.com

Author: Alex Hung

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

@@ -890,6 +890,9 @@ amdgpu_colorop_tf_to_dc_tf(enum drm_colorop_curve_1d_type tf)
 	case DRM_COLOROP_1D_CURVE_BT2020_INV_OETF:
 	case DRM_COLOROP_1D_CURVE_BT2020_OETF:
 		return TRANSFER_FUNCTION_BT709;
+	case DRM_COLOROP_1D_CURVE_GAMMA22:
+	case DRM_COLOROP_1D_CURVE_GAMMA22_INV:
+		return TRANSFER_FUNCTION_GAMMA22;
 	default:
 		return TRANSFER_FUNCTION_LINEAR;
 	}

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

@@ -36,17 +36,20 @@
 const u64 amdgpu_dm_supported_degam_tfs =
 	BIT(DRM_COLOROP_1D_CURVE_SRGB_EOTF) |
 	BIT(DRM_COLOROP_1D_CURVE_PQ_125_EOTF) |
-	BIT(DRM_COLOROP_1D_CURVE_BT2020_INV_OETF);
+	BIT(DRM_COLOROP_1D_CURVE_BT2020_INV_OETF) |
+	BIT(DRM_COLOROP_1D_CURVE_GAMMA22_INV);
 
 const u64 amdgpu_dm_supported_shaper_tfs =
 	BIT(DRM_COLOROP_1D_CURVE_SRGB_INV_EOTF) |
 	BIT(DRM_COLOROP_1D_CURVE_PQ_125_INV_EOTF) |
-	BIT(DRM_COLOROP_1D_CURVE_BT2020_OETF);
+	BIT(DRM_COLOROP_1D_CURVE_BT2020_OETF) |
+	BIT(DRM_COLOROP_1D_CURVE_GAMMA22);
 
 const u64 amdgpu_dm_supported_blnd_tfs =
 	BIT(DRM_COLOROP_1D_CURVE_SRGB_EOTF) |
 	BIT(DRM_COLOROP_1D_CURVE_PQ_125_EOTF) |
-	BIT(DRM_COLOROP_1D_CURVE_BT2020_INV_OETF);
+	BIT(DRM_COLOROP_1D_CURVE_BT2020_INV_OETF) |
+	BIT(DRM_COLOROP_1D_CURVE_GAMMA22_INV);
 
 #define MAX_COLOR_PIPELINE_OPS 10