linux-kernel - [RFC PATCH v2 13/18] drm/amd/display: Define 3D LUT struct for HDR planes

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Message-Id: <20230109143846.1966301-14-mwen@igalia.com>
Date:   Mon,  9 Jan 2023 13:38:41 -0100
From:   Melissa Wen <mwen@...lia.com>
To:     harry.wentland@....com, sunpeng.li@....com,
        Rodrigo.Siqueira@....com, alexander.deucher@....com,
        christian.koenig@....com, Xinhui.Pan@....com, airlied@...il.com,
        daniel@...ll.ch
Cc:     Joshua Ashton <joshua@...ggi.es>, alex.hung@....com,
        nicholas.kazlauskas@....com, sungjoon.kim@....com,
        seanpaul@...omium.org, bhawanpreet.lakha@....com,
        Shashank Sharma <shashank.sharma@....com>,
        ville.syrjala@...ux.intel.com, maarten.lankhorst@...ux.intel.com,
        mripard@...nel.org, tzimmermann@...e.de, kernel-dev@...lia.com,
        laurent.pinchart+renesas@...asonboard.com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH v2 13/18] drm/amd/display: Define 3D LUT struct for HDR planes

From: Alex Hung <alex.hung@....com>

Add a 3D LUT mode supported by amdgpu driver.

Note: A patchset "IGT tests for pre-blending 3D LUT interfaces" for this
proposal is sent to IGT mailing list.

Signed-off-by: Alex Hung <alex.hung@....com>
---
 .../gpu/drm/amd/display/modules/color/color_gamma.h  | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/modules/color/color_gamma.h b/drivers/gpu/drm/amd/display/modules/color/color_gamma.h
index 2893abf48208..8e159b1eb9c6 100644
--- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.h
+++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.h
@@ -27,6 +27,7 @@
 #define COLOR_MOD_COLOR_GAMMA_H_
 
 #include "color_table.h"
+#include <drm/drm_fourcc.h>
 
 struct dc_transfer_func;
 struct dc_gamma;
@@ -35,6 +36,17 @@ struct dc_rgb_fixed;
 struct dc_color_caps;
 enum dc_transfer_func_predefined;
 
+/*
+ * 3D LUT mode for 17x17x17 LUT and 12 bits of color depth
+ */
+static const struct drm_mode_lut3d_mode lut3d_mode_17_12bit = {
+	.lut_size = 17,
+	.lut_stride = {17, 17, 18},
+	.bit_depth = 12,
+	.color_format = DRM_FORMAT_XRGB16161616,
+	.flags = 0,
+};
+
 /* For SetRegamma ADL interface support
  * Must match escape type
  */
-- 
2.35.1