[v2 04/25] drm: Add Color lut range attributes

[Uma Shankar]

This defines a new structure to define color lut ranges,
along with related macro definitions and enums. This will help
describe segmented lut ranges/PWL LUTs in the hardware.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah at intel.com>
---
 include/uapi/drm/drm_mode.h | 64 +++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index e5090416c1ae..9ed8b1b1357a 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -1175,6 +1175,70 @@ struct hdr_output_metadata {
 				  DRM_MODE_PAGE_FLIP_ASYNC | \
 				  DRM_MODE_PAGE_FLIP_TARGET)
 
+/**
+ * DRM_COLOROP_1D_LUT_MULTSEG_INTERPOLATE
+ *
+ * linearly interpolate between the points
+ */
+#define DRM_COLOROP_1D_LUT_MULTSEG_INTERPOLATE BIT(0)
+
+/**
+ * DRM_COLOROP_1D_LUT_MULTSEG_REUSE_LAST
+ *
+ * the last value of the previous range is the
+ * first value of the current range.
+ */
+#define DRM_COLOROP_1D_LUT_MULTSEG_REUSE_LAST BIT(1)
+
+/**
+ * DRM_COLOROP_1D_LUT_MULTSEG_NON_DECREASING
+ *
+ * the curve must be non-decreasing
+ */
+#define DRM_COLOROP_1D_LUT_MULTSEG_NON_DECREASING BIT(2)
+
+/**
+ * DRM_COLOROP_1D_LUT_MULTSEG_REFLECT_NEGATIVE
+ *
+ *  the curve is reflected across origin for negative inputs
+ */
+#define DRM_COLOROP_1D_LUT_MULTSEG_REFLECT_NEGATIVE BIT(3)
+
+/**
+ * DRM_COLOROP_1D_LUT_MULTSEG_SINGLE_CHANNEL
+ *
+ * the same curve (red) is used for blue and green channels as well
+ */
+#define DRM_COLOROP_1D_LUT_MULTSEG_SINGLE_CHANNEL BIT(4)
+
+/**
+ * struct drm_color_lut_range
+ *
+ * structure to advertise capability of a color hardware
+ * block that accepts LUT values.  It can represent LUTs with
+ * varied number of entries and distributions
+ * (Multi segmented, Logarithmic etc).
+ */
+
+struct drm_color_lut_range {
+	/* DRM_COLOROP_1D_LUT_MULTSEG_* */
+	__u32 flags;
+	/* number of points on the curve in the segment */
+	__u16 count;
+	/* input start/end values of the segment */
+	__s32 start, end;
+	/* normalization factor. Represents 1.0 in terms of smallest step size */
+	__u32 norm_factor;
+
+	/* precision of HW LUT*/
+	struct {
+		/* Integer precision */
+		__u16 intp;
+		/* Fractional precision */
+		__u16 fracp;
+	} precision;
+};
+
 /*
  * Request a page flip on the specified crtc.
  *
-- 
2.42.0