linux-kernel - [PATCH v3 15/21] drm: Add helper to extract a LUT entry from either 16-bit or 32-bit LUT

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Message-Id: <20251223-mtk-post-blend-color-pipeline-v3-15-7d969f9a37a0@collabora.com>
Date: Tue, 23 Dec 2025 15:01:35 -0300
From: Ariel D'Alessandro <ariel.dalessandro@...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>, 
 Louis Chauvet <louis.chauvet@...tlin.com>, 
 Haneen Mohammed <hamohammed.sa@...il.com>, 
 Melissa Wen <melissa.srw@...il.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-mediatek@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
 kernel@...labora.com, 
 Nícolas F. R. A. Prado <nfraprado@...labora.com>, 
 Ariel D'Alessandro <ariel.dalessandro@...labora.com>
Subject: [PATCH v3 15/21] drm: Add helper to extract a LUT entry from
 either 16-bit or 32-bit LUT

Add a common helper to ease extracting a 32-bit LUT entry from either
16-bit or 32-bit LUT entry. This is handy for code that needs to handle
both bit widths.

Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@...labora.com>
Co-developed-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
---
 include/drm/drm_color_mgmt.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
index 51279267ed3fd..3d0117aae342d 100644
--- a/include/drm/drm_color_mgmt.h
+++ b/include/drm/drm_color_mgmt.h
@@ -66,6 +66,33 @@ static inline u32 drm_color_lut32_extract(u32 user_input, int bit_precision)
 				     (1ULL << 32) - 1);
 }

+/**
+ * drm_color_lut_to_lut32 - Copy LUT entry contents to 32-bit channel color LUT
+ *
+ * @dest: The destination 32-bit per channel color LUT entry
+ * @src: The source array of LUT entries (16-bit or 32-bit depending on @bits32)
+ * @index: LUT entry array index
+ * @bits32: Boolean indicating the source LUT entry bit-witdh
+ *
+ * Copy the contents of a LUT entry from the source array, to a 32-bit channel
+ * color LUT. The source array of LUT entries can be 16-bit or 32-bit width
+ * depending on the @bits32 boolean argument.
+ */
+static inline void drm_color_lut_to_lut32(struct drm_color_lut32 *dest,
+					  void *src, int index, bool bits32)
+{
+	if (bits32) {
+		*dest = ((struct drm_color_lut32 *)src)[index];
+	} else {
+		struct drm_color_lut *lut =
+			&((struct drm_color_lut *)src)[index];
+		dest->red = lut->red;
+		dest->green = lut->green;
+		dest->blue = lut->blue;
+		dest->reserved = lut->reserved;
+	}
+}
+
 /**
  * drm_color_ctm_to_ctm_3x4 - Copy CTM matrix contents to 3x4 dimensions matrix
  *

-- 
2.51.0