drm/amd/display: add 3D LUT colorop

This adds support for a 3D LUT.

The color pipeline now consists of the following colorops:
1. 1D curve colorop
2. Multiplier
3. 3x4 CTM
4. 1D curve colorop
5. 1D LUT
6. 3D LUT
7. 1D curve colorop
8. 1D LUT

Signed-off-by: Alex Hung <alex.hung@amd.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Simon Ser <contact@emersion.fr>
Link: https://patch.msgid.link/20251115000237.3561250-47-alex.hung@amd.com

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c

@@ -866,6 +866,59 @@ static void __drm_3dlut_to_dc_3dlut(const struct drm_color_lut *lut,
 	__to_dc_lut3d_color(&lut0[lut_i], lut[i], bit_depth);
 }
 
+static void __to_dc_lut3d_32_color(struct dc_rgb *rgb,
+				   const struct drm_color_lut32 lut,
+				   int bit_precision)
+{
+	rgb->red = drm_color_lut32_extract(lut.red, bit_precision);
+	rgb->green = drm_color_lut32_extract(lut.green, bit_precision);
+	rgb->blue  = drm_color_lut32_extract(lut.blue, bit_precision);
+}
+
+static void __drm_3dlut32_to_dc_3dlut(const struct drm_color_lut32 *lut,
+				       uint32_t lut3d_size,
+				       struct tetrahedral_params *params,
+				       bool use_tetrahedral_9,
+				       int bit_depth)
+{
+	struct dc_rgb *lut0;
+	struct dc_rgb *lut1;
+	struct dc_rgb *lut2;
+	struct dc_rgb *lut3;
+	int lut_i, i;
+
+
+	if (use_tetrahedral_9) {
+		lut0 = params->tetrahedral_9.lut0;
+		lut1 = params->tetrahedral_9.lut1;
+		lut2 = params->tetrahedral_9.lut2;
+		lut3 = params->tetrahedral_9.lut3;
+	} else {
+		lut0 = params->tetrahedral_17.lut0;
+		lut1 = params->tetrahedral_17.lut1;
+		lut2 = params->tetrahedral_17.lut2;
+		lut3 = params->tetrahedral_17.lut3;
+	}
+
+	for (lut_i = 0, i = 0; i < lut3d_size - 4; lut_i++, i += 4) {
+		/*
+		 * We should consider the 3D LUT RGB values are distributed
+		 * along four arrays lut0-3 where the first sizes 1229 and the
+		 * other 1228. The bit depth supported for 3dlut channel is
+		 * 12-bit, but DC also supports 10-bit.
+		 *
+		 * TODO: improve color pipeline API to enable the userspace set
+		 * bit depth and 3D LUT size/stride, as specified by VA-API.
+		 */
+		__to_dc_lut3d_32_color(&lut0[lut_i], lut[i], bit_depth);
+		__to_dc_lut3d_32_color(&lut1[lut_i], lut[i + 1], bit_depth);
+		__to_dc_lut3d_32_color(&lut2[lut_i], lut[i + 2], bit_depth);
+		__to_dc_lut3d_32_color(&lut3[lut_i], lut[i + 3], bit_depth);
+	}
+	/* lut0 has 1229 points (lut_size/4 + 1) */
+	__to_dc_lut3d_32_color(&lut0[lut_i], lut[i], bit_depth);
+}
+
 /* amdgpu_dm_atomic_lut3d - set DRM 3D LUT to DC stream
  * @drm_lut3d: user 3D LUT
  * @drm_lut3d_size: size of 3D LUT
@@ -1460,6 +1513,7 @@ __set_dm_plane_colorop_shaper(struct drm_plane_state *plane_state,
 	struct dc_transfer_func *tf = &dc_plane_state->in_shaper_func;
 	const struct drm_color_lut32 *shaper_lut;
 	struct drm_device *dev = colorop->dev;
+	bool enabled = false;
 	u32 shaper_size;
 	int i = 0, ret = 0;
 
@@ -1481,6 +1535,7 @@ __set_dm_plane_colorop_shaper(struct drm_plane_state *plane_state,
 		ret = __set_output_tf(tf, 0, 0, false);
 		if (ret)
 			return ret;
+		enabled = true;
 	}
 
 	/* 1D LUT - SHAPER LUT */
@@ -1512,12 +1567,102 @@ __set_dm_plane_colorop_shaper(struct drm_plane_state *plane_state,
 			ret = __set_output_tf_32(tf, shaper_lut, shaper_size, false);
 			if (ret)
 				return ret;
+			enabled = true;
 		}
 	}
 
+	if (!enabled)
+		tf->type = TF_TYPE_BYPASS;
+
 	return 0;
 }
 
+/* __set_colorop_3dlut - set DRM 3D LUT to DC stream
+ * @drm_lut3d: user 3D LUT
+ * @drm_lut3d_size: size of 3D LUT
+ * @lut3d: DC 3D LUT
+ *
+ * Map user 3D LUT data to DC 3D LUT and all necessary bits to program it
+ * on DCN accordingly.
+ *
+ * Returns:
+ * 0 on success. -EINVAL if drm_lut3d_size is zero.
+ */
+static int __set_colorop_3dlut(const struct drm_color_lut32 *drm_lut3d,
+				uint32_t drm_lut3d_size,
+				struct dc_3dlut *lut)
+{
+	if (!drm_lut3d_size) {
+		lut->state.bits.initialized = 0;
+		return -EINVAL;
+	}
+
+	/* Only supports 17x17x17 3D LUT (12-bit) now */
+	lut->lut_3d.use_12bits = true;
+	lut->lut_3d.use_tetrahedral_9 = false;
+
+	lut->state.bits.initialized = 1;
+	__drm_3dlut32_to_dc_3dlut(drm_lut3d, drm_lut3d_size, &lut->lut_3d,
+				   lut->lut_3d.use_tetrahedral_9, 12);
+
+	return 0;
+}
+
+static int
+__set_dm_plane_colorop_3dlut(struct drm_plane_state *plane_state,
+			     struct dc_plane_state *dc_plane_state,
+			     struct drm_colorop *colorop)
+{
+	struct drm_colorop *old_colorop;
+	struct drm_colorop_state *colorop_state = NULL, *new_colorop_state;
+	struct dc_transfer_func *tf = &dc_plane_state->in_shaper_func;
+	struct drm_atomic_state *state = plane_state->state;
+	const struct amdgpu_device *adev = drm_to_adev(colorop->dev);
+	const struct drm_device *dev = colorop->dev;
+	const struct drm_color_lut32 *lut3d;
+	uint32_t lut3d_size;
+	int i = 0, ret = 0;
+
+	/* 3D LUT */
+	old_colorop = colorop;
+	for_each_new_colorop_in_state(state, colorop, new_colorop_state, i) {
+		if (new_colorop_state->colorop == old_colorop &&
+		    new_colorop_state->colorop->type == DRM_COLOROP_3D_LUT) {
+			colorop_state = new_colorop_state;
+			break;
+		}
+	}
+
+	if (colorop_state && !colorop_state->bypass && colorop->type == DRM_COLOROP_3D_LUT) {
+		if (!adev->dm.dc->caps.color.dpp.hw_3d_lut) {
+			drm_dbg(dev, "3D LUT is not supported by hardware\n");
+			return -EINVAL;
+		}
+
+		drm_dbg(dev, "3D LUT colorop with ID: %d\n", colorop->base.id);
+		lut3d = __extract_blob_lut32(colorop_state->data, &lut3d_size);
+		lut3d_size = lut3d != NULL ? lut3d_size : 0;
+		ret = __set_colorop_3dlut(lut3d, lut3d_size, &dc_plane_state->lut3d_func);
+		if (ret) {
+			drm_dbg(dev, "3D LUT colorop with ID: %d has LUT size = %d\n",
+				colorop->base.id, lut3d_size);
+			return ret;
+		}
+
+		/* 3D LUT requires shaper. If shaper colorop is bypassed, enable shaper curve
+		 * with TRANSFER_FUNCTION_LINEAR
+		 */
+		if (tf->type == TF_TYPE_BYPASS) {
+			tf->type = TF_TYPE_DISTRIBUTED_POINTS;
+			tf->tf = TRANSFER_FUNCTION_LINEAR;
+			tf->sdr_ref_white_level = SDR_WHITE_LEVEL_INIT_VALUE;
+			ret = __set_output_tf_32(tf, NULL, 0, false);
+		}
+	}
+
+	return ret;
+}
+
 static int
 __set_dm_plane_colorop_blend(struct drm_plane_state *plane_state,
 			     struct dc_plane_state *dc_plane_state,
@@ -1689,6 +1834,17 @@ amdgpu_dm_plane_set_colorop_properties(struct drm_plane_state *plane_state,
 	if (!colorop)
 		return -EINVAL;
 
+	/* 3D LUT */
+	colorop = colorop->next;
+	if (!colorop) {
+		drm_dbg(dev, "no 3D LUT colorop found\n");
+		return -EINVAL;
+	}
+
+	ret = __set_dm_plane_colorop_3dlut(plane_state, dc_plane_state, colorop);
+	if (ret)
+		return ret;
+
 	/* 1D Curve & LUT - BLND TF & LUT */
 	colorop = colorop->next;
 	if (!colorop) {

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_colorop.c

@@ -49,6 +49,8 @@ const u64 amdgpu_dm_supported_blnd_tfs =
 
 #define MAX_COLOR_PIPELINE_OPS 10
 
+#define LUT3D_SIZE		17
+
 int amdgpu_dm_initialize_default_pipeline(struct drm_plane *plane, struct drm_prop_enum_list *list)
 {
 	struct drm_colorop *ops[MAX_COLOR_PIPELINE_OPS];
@@ -140,6 +142,23 @@ int amdgpu_dm_initialize_default_pipeline(struct drm_plane *plane, struct drm_pr
 
 	i++;
 
+	/* 3D LUT */
+	ops[i] = kzalloc(sizeof(struct drm_colorop), GFP_KERNEL);
+	if (!ops[i]) {
+		ret = -ENOMEM;
+		goto cleanup;
+	}
+
+	ret = drm_plane_colorop_3dlut_init(dev, ops[i], plane, LUT3D_SIZE,
+				     DRM_COLOROP_LUT3D_INTERPOLATION_TETRAHEDRAL,
+				     DRM_COLOROP_FLAG_ALLOW_BYPASS);
+	if (ret)
+		goto cleanup;
+
+	drm_colorop_set_next_property(ops[i-1], ops[i]);
+
+	i++;
+
 	/* 1D curve - BLND TF */
 	ops[i] = kzalloc(sizeof(*ops[0]), GFP_KERNEL);
 	if (!ops[i]) {