[v7 13/16] drm/i915/icl: Implement Plane Gamma

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

Implement Plane Gamma on ICL.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
---
 drivers/gpu/drm/i915/intel_color.c | 75 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index 504c046..22790b4 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -692,10 +692,85 @@ static void icl_load_plane_degamma_lut(const struct drm_plane_state *state,
 	}
 }
 
+static void icl_load_plane_gamma_lut(const struct drm_plane_state *state,
+				     u32 offset)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->plane->dev);
+	enum pipe pipe = to_intel_plane(state->plane)->pipe;
+	enum plane_id plane = to_intel_plane(state->plane)->id;
+	u32 i, lut_size;
+
+	lut_size = 32;
+	if (icl_is_hdr_plane(dev_priv, plane)) {
+		if (state->degamma_lut) {
+			struct drm_color_lut_ext *lut =
+				(struct drm_color_lut_ext *)state->gamma_lut->data;
+
+			for (i = 0; i < lut_size; i++) {
+				u64 word = drm_color_lut_extract_ext(lut[i].red, 24);
+				u32 lut_val = (word & 0x7ffffffff) >> 8;
+
+				I915_WRITE(PLANE_PRE_CSC_GAMC_DATA_ENH(pipe, plane, i), lut_val);
+			}
+
+			/* Program the max register to clamp values > 1.0. */
+			I915_WRITE(PLANE_PRE_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+				   drm_color_lut_extract_ext(lut[i].red, 24));
+			I915_WRITE(PLANE_PRE_CSC_GAMC_DATA_ENH(pipe, plane, 1),
+				   drm_color_lut_extract_ext(lut[i].green, 24));
+			I915_WRITE(PLANE_PRE_CSC_GAMC_DATA_ENH(pipe, plane, 2),
+				   drm_color_lut_extract_ext(lut[i].blue, 24));
+		} else {
+			for (i = 0; i < lut_size; i++) {
+				u32 v = (i * ((1 << 24) - 1)) / (lut_size - 1);
+				I915_WRITE(PLANE_PRE_CSC_GAMC_DATA_ENH(pipe, plane, i), v);
+			}
+
+			I915_WRITE(PLANE_PRE_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+				   (1 << 24) - 1);
+			I915_WRITE(PLANE_PRE_CSC_GAMC_DATA_ENH(pipe, plane, 1),
+				   (1 << 24) - 1);
+			I915_WRITE(PLANE_PRE_CSC_GAMC_DATA_ENH(pipe, plane, 2),
+				   (1 << 24) - 1);
+		}
+	} else {
+		if (state->degamma_lut) {
+			struct drm_color_lut *lut =
+				(struct drm_color_lut *)state->gamma_lut->data;
+
+			for (i = 0; i < lut_size; i++)
+				I915_WRITE(PLANE_PRE_CSC_GAMC_DATA(pipe, plane, i),
+					   lut[i].green);
+
+			/* Program the max register to clamp values > 1.0. */
+			I915_WRITE(PLANE_PRE_CSC_GAMC_DATA(pipe, plane, 0),
+				   (1 << 16));
+			I915_WRITE(PLANE_PRE_CSC_GAMC_DATA(pipe, plane, 1),
+				   (1 << 16));
+			I915_WRITE(PLANE_PRE_CSC_GAMC_DATA(pipe, plane, 2),
+				   (1 << 16));
+		} else {
+			for (i = 0; i < lut_size; i++) {
+				u32 v = (i * ((1 << 24) - 1)) / (lut_size - 1);
+
+				I915_WRITE(PLANE_PRE_CSC_GAMC_DATA(pipe, plane, i), v);
+			}
+
+			I915_WRITE(PLANE_PRE_CSC_GAMC_DATA(pipe, plane, 0),
+				   (1 << 16));
+			I915_WRITE(PLANE_PRE_CSC_GAMC_DATA(pipe, plane, 1),
+				   (1 << 16));
+			I915_WRITE(PLANE_PRE_CSC_GAMC_DATA(pipe, plane, 2),
+				   (1 << 16));
+		}
+	}
+}
+
 /* Loads the palette/gamma unit for the CRTC on Gen11+. */
 static void icl_load_plane_luts(const struct drm_plane_state *state)
 {
 	icl_load_plane_degamma_lut(state, 0);
+	icl_load_plane_gamma_lut(state, 0);
 }
 
 static void glk_load_degamma_lut(const struct intel_crtc_state *crtc_state)
-- 
1.9.1

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