linux-kernel - [RFC PATCH v2 01/18] drm: Add 3D LUT mode and its attributes

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Message-Id: <20230109143846.1966301-2-mwen@igalia.com>
Date:   Mon,  9 Jan 2023 13:38:29 -0100
From:   Melissa Wen <mwen@...lia.com>
To:     maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, 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, kernel-dev@...lia.com,
        laurent.pinchart+renesas@...asonboard.com,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v2 01/18] drm: Add 3D LUT mode and its attributes

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

A struct is defined for 3D LUT modes to be supported by hardware.
The elements includes lut_size, lut_stride, bit_depth, color_format
and flags.

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>
---
 include/uapi/drm/drm_mode.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index fa953309d9ce..fddb86dad4db 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -849,6 +849,23 @@ struct drm_color_lut {
 	__u16 reserved;
 };
 
+/*
+ * struct drm_mode_lut3d_mode - 3D LUT mode information.
+ * @lut_size: number of valid points on every dimension of 3D LUT.
+ * @lut_stride: number of points on every dimension of 3D LUT.
+ * @bit_depth: number of bits of RGB. If color_mode defines entries with higher
+ *             bit_depth the least significant bits will be truncated.
+ * @color_format: fourcc values, ex. DRM_FORMAT_XRGB16161616 or DRM_FORMAT_XBGR16161616.
+ * @flags: flags for hardware-sepcific features
+ */
+struct drm_mode_lut3d_mode {
+	__u16 lut_size;
+	__u16 lut_stride[3];
+	__u16 bit_depth;
+	__u32 color_format;
+	__u32 flags;
+};
+
 /**
  * struct hdr_metadata_infoframe - HDR Metadata Infoframe Data.
  *
-- 
2.35.1