[Intel-gfx] [RFC 07/33] drm: Add Enhanced Gamma LUT precision structure

[Uma Shankar <uma.shankar@intel.com>]

Existing LUT precision structure is having only 16 bit
precision. This is not enough for upcoming enhanced hardwares
and advance usecases like HDR processing. Hence added a new
structure with 32 bit precision values.

Co-developed-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.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 a21825ee93e2..1cd656b0e994 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -943,6 +943,23 @@ struct hdr_output_metadata {
 	};
 };
 
+/**
+ * struct drm_color_lut_ext - Represents high precision lut values
+ *
+ * Creating 64 bit palette entries for better data
+ * precision. This will be required for HDR and
+ * similar color processing usecases.
+ */
+struct drm_color_lut_ext {
+	/*
+	 * Data is U32.32 fixed point format.
+	 */
+	__u64 red;
+	__u64 green;
+	__u64 blue;
+	__u64 reserved;
+};
+
 /**
  * enum color_op_block
  *
-- 
2.38.1