drm/i915/color: Add 3D LUT to color pipeline

Add helpers to program the 3D LUT registers and arm them.

LUT_3D_READY in LUT_3D_CLT is cleared off by the HW once
the LUT buffer is loaded into it's internal working RAM.
So by the time we try to load/commit new values, we expect
it to be cleared off. If not, log an error and return
without writing new values. Do it only when writing with MMIO.
There is no way to read register within DSB execution.

v2:
- Add information regarding LUT_3D_READY to commit message (Jani)
- Log error instead of a drm_warn and return without committing changes
  if 3DLUT HW is not ready to accept new values.
- Refactor intel_color_crtc_has_3dlut()
  Also remove Gen10 check (Suraj)
v3:
- Addressed review comments (Suraj)

Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patch.msgid.link/20251203085211.3663374-15-uma.shankar@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Author: ckborah

drivers/gpu/drm/i915/display/intel_color.c

@@ -4062,6 +4062,52 @@ xelpd_plane_load_luts(struct intel_dsb *dsb, const struct intel_plane_state *pla
 		xelpd_program_plane_post_csc_lut(dsb, plane_state);
 }
 
+static u32 glk_3dlut_10(const struct drm_color_lut32 *color)
+{
+	return REG_FIELD_PREP(LUT_3D_DATA_RED_MASK, drm_color_lut32_extract(color->red, 10)) |
+		REG_FIELD_PREP(LUT_3D_DATA_GREEN_MASK, drm_color_lut32_extract(color->green, 10)) |
+		REG_FIELD_PREP(LUT_3D_DATA_BLUE_MASK, drm_color_lut32_extract(color->blue, 10));
+}
+
+static void glk_load_lut_3d(struct intel_dsb *dsb,
+			    struct intel_crtc *crtc,
+			    const struct drm_property_blob *blob)
+{
+	struct intel_display *display = to_intel_display(crtc->base.dev);
+	const struct drm_color_lut32 *lut = blob->data;
+	int i, lut_size = drm_color_lut32_size(blob);
+	enum pipe pipe = crtc->pipe;
+
+	if (!dsb && intel_de_read(display, LUT_3D_CTL(pipe)) & LUT_3D_READY) {
+		drm_err(display->drm, "[CRTC:%d:%s] 3D LUT not ready, not loading LUTs\n",
+			crtc->base.base.id, crtc->base.name);
+		return;
+	}
+
+	intel_de_write_dsb(display, dsb, LUT_3D_INDEX(pipe), LUT_3D_AUTO_INCREMENT);
+	for (i = 0; i < lut_size; i++)
+		intel_de_write_dsb(display, dsb, LUT_3D_DATA(pipe), glk_3dlut_10(&lut[i]));
+	intel_de_write_dsb(display, dsb, LUT_3D_INDEX(pipe), 0);
+}
+
+static void glk_lut_3d_commit(struct intel_dsb *dsb, struct intel_crtc *crtc, bool enable)
+{
+	struct intel_display *display = to_intel_display(crtc);
+	enum pipe pipe = crtc->pipe;
+	u32 val = 0;
+
+	if (!dsb && intel_de_read(display, LUT_3D_CTL(pipe)) & LUT_3D_READY) {
+		drm_err(display->drm, "[CRTC:%d:%s] 3D LUT not ready, not committing change\n",
+			crtc->base.base.id, crtc->base.name);
+		return;
+	}
+
+	if (enable)
+		val = LUT_3D_ENABLE | LUT_3D_READY | LUT_3D_BIND_PLANE_1;
+
+	intel_de_write_dsb(display, dsb, LUT_3D_CTL(pipe), val);
+}
+
 static const struct intel_color_funcs chv_color_funcs = {
 	.color_check = chv_color_check,
 	.color_commit_arm = i9xx_color_commit_arm,
@@ -4191,6 +4237,16 @@ static const struct intel_color_funcs ilk_color_funcs = {
 	.get_config = ilk_get_config,
 };
 
+void intel_color_plane_commit_arm(struct intel_dsb *dsb,
+				  const struct intel_plane_state *plane_state)
+{
+	struct intel_display *display = to_intel_display(plane_state);
+	struct intel_crtc *crtc = to_intel_crtc(plane_state->uapi.crtc);
+
+	if (crtc && intel_color_crtc_has_3dlut(display, crtc->pipe))
+		glk_lut_3d_commit(dsb, crtc, !!plane_state->hw.lut_3d);
+}
+
 static void
 intel_color_load_plane_csc_matrix(struct intel_dsb *dsb,
 				  const struct intel_plane_state *plane_state)
@@ -4211,13 +4267,35 @@ intel_color_load_plane_luts(struct intel_dsb *dsb,
 		display->funcs.color->load_plane_luts(dsb, plane_state);
 }
 
+bool
+intel_color_crtc_has_3dlut(struct intel_display *display, enum pipe pipe)
+{
+	if (DISPLAY_VER(display) >= 12)
+		return pipe == PIPE_A || pipe == PIPE_B;
+	else
+		return false;
+}
+
+static void
+intel_color_load_3dlut(struct intel_dsb *dsb,
+		       const struct intel_plane_state *plane_state)
+{
+	struct intel_display *display = to_intel_display(plane_state);
+	struct intel_crtc *crtc = to_intel_crtc(plane_state->uapi.crtc);
+
+	if (crtc && intel_color_crtc_has_3dlut(display, crtc->pipe))
+		glk_load_lut_3d(dsb, crtc, plane_state->hw.lut_3d);
+}
+
 void intel_color_plane_program_pipeline(struct intel_dsb *dsb,
 					const struct intel_plane_state *plane_state)
 {
 	if (plane_state->hw.ctm)
 		intel_color_load_plane_csc_matrix(dsb, plane_state);
 	if (plane_state->hw.degamma_lut || plane_state->hw.gamma_lut)
 		intel_color_load_plane_luts(dsb, plane_state);
+	if (plane_state->hw.lut_3d)
+		intel_color_load_3dlut(dsb, plane_state);
 }
 
 void intel_color_crtc_init(struct intel_crtc *crtc)

drivers/gpu/drm/i915/display/intel_color.h

@@ -15,6 +15,7 @@ struct intel_display;
 struct intel_dsb;
 struct intel_plane_state;
 struct drm_property_blob;
+enum pipe;
 
 void intel_color_init_hooks(struct intel_display *display);
 int intel_color_init(struct intel_display *display);
@@ -43,4 +44,7 @@ bool intel_color_lut_equal(const struct intel_crtc_state *crtc_state,
 void intel_color_assert_luts(const struct intel_crtc_state *crtc_state);
 void intel_color_plane_program_pipeline(struct intel_dsb *dsb,
 					const struct intel_plane_state *plane_state);
+void intel_color_plane_commit_arm(struct intel_dsb *dsb,
+				  const struct intel_plane_state *plane_state);
+bool intel_color_crtc_has_3dlut(struct intel_display *display, enum pipe pipe);
 #endif /* __INTEL_COLOR_H__ */

drivers/gpu/drm/i915/display/intel_color_pipeline.c

@@ -2,6 +2,7 @@
 /*
  * Copyright © 2025 Intel Corporation
  */
+#include "intel_color.h"
 #include "intel_colorop.h"
 #include "intel_color_pipeline.h"
 #include "intel_de.h"
@@ -13,12 +14,14 @@
 #define PLANE_GAMMA_SIZE 32
 
 static
-int _intel_color_pipeline_plane_init(struct drm_plane *plane, struct drm_prop_enum_list *list)
+int _intel_color_pipeline_plane_init(struct drm_plane *plane, struct drm_prop_enum_list *list,
+				     enum pipe pipe)
 {
-	struct intel_colorop *colorop;
 	struct drm_device *dev = plane->dev;
-	int ret;
+	struct intel_display *display = to_intel_display(dev);
 	struct drm_colorop *prev_op;
+	struct intel_colorop *colorop;
+	int ret;
 
 	colorop = intel_colorop_create(INTEL_PLANE_CB_PRE_CSC_LUT);
 
@@ -36,6 +39,22 @@ int _intel_color_pipeline_plane_init(struct drm_plane *plane, struct drm_prop_en
 	/* TODO: handle failures and clean up */
 	prev_op = &colorop->base;
 
+	if (DISPLAY_VER(display) >= 35 &&
+	    intel_color_crtc_has_3dlut(display, pipe) &&
+	    plane->type == DRM_PLANE_TYPE_PRIMARY) {
+		colorop = intel_colorop_create(INTEL_PLANE_CB_3DLUT);
+
+		ret = drm_plane_colorop_3dlut_init(dev, &colorop->base, plane, 17,
+						   DRM_COLOROP_LUT3D_INTERPOLATION_TETRAHEDRAL,
+						   true);
+		if (ret)
+			return ret;
+
+		drm_colorop_set_next_property(prev_op, &colorop->base);
+
+		prev_op = &colorop->base;
+	}
+
 	colorop = intel_colorop_create(INTEL_PLANE_CB_CSC);
 	ret = drm_plane_colorop_ctm_3x4_init(dev, &colorop->base, plane,
 					     DRM_COLOROP_FLAG_ALLOW_BYPASS);
@@ -58,7 +77,7 @@ int _intel_color_pipeline_plane_init(struct drm_plane *plane, struct drm_prop_en
 	return 0;
 }
 
-int intel_color_pipeline_plane_init(struct drm_plane *plane)
+int intel_color_pipeline_plane_init(struct drm_plane *plane, enum pipe pipe)
 {
 	struct drm_device *dev = plane->dev;
 	struct intel_display *display = to_intel_display(dev);
@@ -71,7 +90,7 @@ int intel_color_pipeline_plane_init(struct drm_plane *plane)
 		return 0;
 
 	/* Add pipeline consisting of transfer functions */
-	ret = _intel_color_pipeline_plane_init(plane, &pipelines[len]);
+	ret = _intel_color_pipeline_plane_init(plane, &pipelines[len], pipe);
 	if (ret)
 		return ret;
 	len++;

drivers/gpu/drm/i915/display/intel_color_pipeline.h

@@ -7,7 +7,8 @@
 #define __INTEL_COLOR_PIPELINE_H__
 
 struct drm_plane;
+enum pipe;
 
-int intel_color_pipeline_plane_init(struct drm_plane *plane);
+int intel_color_pipeline_plane_init(struct drm_plane *plane, enum pipe pipe);
 
 #endif /* __INTEL_COLOR_PIPELINE_H__ */

drivers/gpu/drm/i915/display/intel_display_limits.h

@@ -142,6 +142,7 @@ enum intel_color_block {
 	INTEL_PLANE_CB_PRE_CSC_LUT,
 	INTEL_PLANE_CB_CSC,
 	INTEL_PLANE_CB_POST_CSC_LUT,
+	INTEL_PLANE_CB_3DLUT,
 
 	INTEL_CB_MAX
 };

drivers/gpu/drm/i915/display/intel_display_types.h

@@ -646,7 +646,7 @@ struct intel_plane_state {
 		enum drm_color_encoding color_encoding;
 		enum drm_color_range color_range;
 		enum drm_scaling_filter scaling_filter;
-		struct drm_property_blob *ctm, *degamma_lut, *gamma_lut;
+		struct drm_property_blob *ctm, *degamma_lut, *gamma_lut, *lut_3d;
 	} hw;
 
 	struct i915_vma *ggtt_vma;

drivers/gpu/drm/i915/display/intel_plane.c

@@ -348,6 +348,8 @@ intel_plane_colorop_replace_blob(struct intel_plane_state *plane_state,
 		return	drm_property_replace_blob(&plane_state->hw.degamma_lut, blob);
 	else if (intel_colorop->id == INTEL_PLANE_CB_POST_CSC_LUT)
 		return drm_property_replace_blob(&plane_state->hw.gamma_lut, blob);
+	else if (intel_colorop->id == INTEL_PLANE_CB_3DLUT)
+		return	drm_property_replace_blob(&plane_state->hw.lut_3d, blob);
 
 	return false;
 }