[PATCH 03/10] INTEL_DII: drm/i915/mtl: Add degamma lut range for 24 bit degamma LUT

[Borah, Chaitanya Kumar]

Add a lut range to support high precision degamma LUT.

Signed-off-by: Borah, Chaitanya Kumar <chaitanya.kumar.borah at intel.com>
---
 drivers/gpu/drm/i915/display/intel_color.c | 30 ++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index 4dd5c5c8fd5727..6921827b548762 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -120,6 +120,8 @@ struct intel_color_funcs {
 #define GAMMA_MODE_SPLIT_12BIT			BIT(4)
 #define GAMMA_MODE_LOGARITHMIC_12BIT		BIT(5) /* XELPD+ */
 
+#define DEGAMMA_MODE_24BIT			BIT(0) /* MTL/D14+ */
+
 #define INTEL_GAMMA_MODE_MASK (\
 		GAMMA_MODE_LEGACY_PALETTE_8BIT | \
 		GAMMA_MODE_PRECISION_PALETTE_10BIT | \
@@ -3136,6 +3138,21 @@ static const struct drm_color_lut_range xelpd_gamma_hdr[] = {
 	},
 };
 
+static const struct drm_color_lut_range mtl_24bit_degamma[] = {
+	/* segment 0 */
+	{
+		.flags = (DRM_MODE_LUT_DEGAMMA |
+			  DRM_MODE_LUT_REFLECT_NEGATIVE |
+			  DRM_MODE_LUT_INTERPOLATE |
+			  DRM_MODE_LUT_REUSE_LAST |
+			  DRM_MODE_LUT_NON_DECREASING),
+		.count = 131,
+		.input_bpc = 24, .output_bpc = 24,
+		.start = 0, .end = (1 << 24) - 1,
+		.min = 0, .max = (1 << 24) - 1,
+	}
+};
+
 int intel_color_plane_init(struct drm_plane *plane)
 {
 	struct drm_i915_private *dev_priv = to_i915(plane->dev);
@@ -3224,6 +3241,19 @@ void intel_color_init(struct intel_crtc *crtc)
 							       sizeof(xelpd_logarithmic_gamma),
 							       LUT_TYPE_GAMMA);
 			drm_crtc_attach_gamma_mode_property(&crtc->base);
+
+			if (DISPLAY_VER(dev_priv) >= 14) {
+				drm_color_create_degamma_mode_property(&crtc->base, 2);
+				drm_color_add_gamma_degamma_mode_range(&crtc->base,
+								       "no degamma", NULL, 0,
+								       LUT_TYPE_DEGAMMA);
+				drm_color_add_gamma_degamma_mode_range(&crtc->base,
+								       "extended degamma",
+								       mtl_24bit_degamma,
+								       sizeof(mtl_24bit_degamma),
+								       LUT_TYPE_DEGAMMA);
+			}
+
 		} else if (DISPLAY_VER(dev_priv) >= 11) {
 			dev_priv->color_funcs = &icl_color_funcs;
 		} else if (DISPLAY_VER(dev_priv) == 10) {
-- 
2.25.1