linux-kernel - [PATCH 07/11] drm/colorop: Introduce HLG EOTF

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Message-Id: <20251223-mtk-ovl-pre-blend-colorops-v1-7-0cb99bd0ab33@collabora.com>
Date: Tue, 23 Dec 2025 16:44:48 -0300
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Chun-Kuang Hu <chunkuang.hu@...nel.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-mediatek@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
 daniels@...labora.com, ariel.dalessandro@...labora.com, 
 kernel@...labora.com, 
 Nícolas F. R. A. Prado <nfraprado@...labora.com>
Subject: [PATCH 07/11] drm/colorop: Introduce HLG EOTF

Introduce definition of a hybrid log-gamma electro-optical transfer
function for 1D Curve colorops.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
---
 drivers/gpu/drm/drm_colorop.c |  1 +
 include/drm/drm_colorop.h     | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/drm_colorop.c b/drivers/gpu/drm/drm_colorop.c
index fafe45b93ff8..a19e03fb9c7c 100644
--- a/drivers/gpu/drm/drm_colorop.c
+++ b/drivers/gpu/drm/drm_colorop.c
@@ -79,6 +79,7 @@ static const char * const colorop_curve_1d_type_names[] = {
 	[DRM_COLOROP_1D_CURVE_BT2020_OETF] = "BT.2020 OETF",
 	[DRM_COLOROP_1D_CURVE_GAMMA22] = "Gamma 2.2",
 	[DRM_COLOROP_1D_CURVE_GAMMA22_INV] = "Gamma 2.2 Inverse",
+	[DRM_COLOROP_1D_CURVE_HLG_EOTF] = "HLG",
 };

 static const struct drm_prop_enum_list drm_colorop_lut1d_interpolation_list[] = {
diff --git a/include/drm/drm_colorop.h b/include/drm/drm_colorop.h
index ee6454b08b2d..8ec98521607d 100644
--- a/include/drm/drm_colorop.h
+++ b/include/drm/drm_colorop.h
@@ -126,6 +126,16 @@ enum drm_colorop_curve_1d_type {
 	 * The inverse of &DRM_COLOROP_1D_CURVE_GAMMA22
 	 */
 	DRM_COLOROP_1D_CURVE_GAMMA22_INV,
+
+	/**
+	 * @DRM_COLOROP_1D_CURVE_HLG_EOTF:
+	 *
+	 * enum string "HLG"
+	 *
+	 * Hybrid log-gamma transfer function.
+	 */
+	DRM_COLOROP_1D_CURVE_HLG_EOTF,
+
 	/**
 	 * @DRM_COLOROP_1D_CURVE_COUNT:
 	 *

-- 
2.51.0