drm/colorop: Add 3x4 CTM type

This type is used to support a 3x4 matrix in colorops. A 3x4
matrix uses the last column as a "bias" column. Some HW exposes
support for 3x4. The calculation looks like:

 out   matrix    in
 |R|   |0  1  2  3 |   | R |
 |G| = |4  5  6  7 | x | G |
 |B|   |8  9  10 11|   | B |
                       |1.0|

This is also the first colorop where we need a blob property to
program the property. For that we'll introduce a new DATA
property that can be used by all colorop TYPEs requiring a
blob. The way a DATA blob is read depends on the TYPE of
the colorop.

We only create the DATA property for property types that
need it.

Reviewed-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Louis Chauvet <louis.chauvet@bootlin.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Reviewed-by: Sebastian Wick <sebastian.wick@redhat.com>
Signed-off-by: Simon Ser <contact@emersion.fr>
Link: https://patch.msgid.link/20251115000237.3561250-19-alex.hung@amd.com

3 files changed, 81 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 95111f9a8635..60b3a069f4dd 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -794,6 +794,9 @@ static void drm_atomic_colorop_print_state(struct drm_printer *p,
 		drm_printf(p, "\tcurve_1d_type=%s\n",
 			   drm_get_colorop_curve_1d_type_name(state->curve_1d_type));
 		break;
+	case DRM_COLOROP_CTM_3X4:
+		drm_printf(p, "\tdata blob id=%d\n", state->data ? state->data->base.id : 0);
+		break;
 	default:
 		break;
 	}
diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index 608b0b571c2e..392198aae072 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -689,6 +689,32 @@ drm_atomic_plane_get_property(struct drm_plane *plane,
 	return 0;
 }
 
+static int drm_atomic_color_set_data_property(struct drm_colorop *colorop,
+					      struct drm_colorop_state *state,
+					      struct drm_property *property,
+					      uint64_t val)
+{
+	ssize_t elem_size = -1;
+	ssize_t size = -1;
+	bool replaced = false;
+
+	switch (colorop->type) {
+	case DRM_COLOROP_CTM_3X4:
+		size = sizeof(struct drm_color_ctm_3x4);
+		break;
+	default:
+		/* should never get here */
+		return -EINVAL;
+	}
+
+	return drm_property_replace_blob_from_id(colorop->dev,
+						 &state->data,
+						 val,
+						 size,
+						 elem_size,
+						 &replaced);
+}
+
 static int drm_atomic_colorop_set_property(struct drm_colorop *colorop,
 					   struct drm_colorop_state *state,
 					   struct drm_file *file_priv,
@@ -699,6 +725,9 @@ static int drm_atomic_colorop_set_property(struct drm_colorop *colorop,
 		state->bypass = val;
 	} else if (property == colorop->curve_1d_type_property) {
 		state->curve_1d_type = val;
+	} else if (property == colorop->data_property) {
+		return drm_atomic_color_set_data_property(colorop, state,
+							  property, val);
 	} else {
 		drm_dbg_atomic(colorop->dev,
 			       "[COLOROP:%d:%d] unknown property [PROP:%d:%s]\n",
@@ -721,6 +750,8 @@ drm_atomic_colorop_get_property(struct drm_colorop *colorop,
 		*val = state->bypass;
 	else if (property == colorop->curve_1d_type_property)
 		*val = state->curve_1d_type;
+	else if (property == colorop->data_property)
+		*val = (state->data) ? state->data->base.id : 0;
 	else
 		return -EINVAL;
 
diff --git a/drivers/gpu/drm/drm_colorop.c b/drivers/gpu/drm/drm_colorop.c
index b75ad8544315..c68b85a7b261 100644
--- a/drivers/gpu/drm/drm_colorop.c
+++ b/drivers/gpu/drm/drm_colorop.c
@@ -64,6 +64,7 @@
 
 static const struct drm_prop_enum_list drm_colorop_type_enum_list[] = {
 	{ DRM_COLOROP_1D_CURVE, "1D Curve" },
+	{ DRM_COLOROP_CTM_3X4, "3x4 Matrix"},
 };
 
 static const char * const colorop_curve_1d_type_names[] = {
@@ -147,6 +148,11 @@ void drm_colorop_cleanup(struct drm_colorop *colorop)
 	list_del(&colorop->head);
 	config->num_colorop--;
 
+	if (colorop->state && colorop->state->data) {
+		drm_property_blob_put(colorop->state->data);
+		colorop->state->data = NULL;
+	}
+
 	kfree(colorop->state);
 }
 EXPORT_SYMBOL(drm_colorop_cleanup);
@@ -236,11 +242,51 @@ int drm_plane_colorop_curve_1d_init(struct drm_device *dev, struct drm_colorop *
 }
 EXPORT_SYMBOL(drm_plane_colorop_curve_1d_init);
 
+static int drm_colorop_create_data_prop(struct drm_device *dev, struct drm_colorop *colorop)
+{
+	struct drm_property *prop;
+
+	/* data */
+	prop = drm_property_create(dev, DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
+				   "DATA", 0);
+	if (!prop)
+		return -ENOMEM;
+
+	colorop->data_property = prop;
+	drm_object_attach_property(&colorop->base,
+				   colorop->data_property,
+				   0);
+
+	return 0;
+}
+
+int drm_plane_colorop_ctm_3x4_init(struct drm_device *dev, struct drm_colorop *colorop,
+				   struct drm_plane *plane)
+{
+	int ret;
+
+	ret = drm_plane_colorop_init(dev, colorop, plane, DRM_COLOROP_CTM_3X4);
+	if (ret)
+		return ret;
+
+	ret = drm_colorop_create_data_prop(dev, colorop);
+	if (ret)
+		return ret;
+
+	drm_colorop_reset(colorop);
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_plane_colorop_ctm_3x4_init);
+
 static void __drm_atomic_helper_colorop_duplicate_state(struct drm_colorop *colorop,
 							struct drm_colorop_state *state)
 {
 	memcpy(state, colorop->state, sizeof(*state));
 
+	if (state->data)
+		drm_property_blob_get(state->data);
+
 	state->bypass = true;
 }
 
@@ -321,6 +367,7 @@ void drm_colorop_reset(struct drm_colorop *colorop)
 
 static const char * const colorop_type_name[] = {
 	[DRM_COLOROP_1D_CURVE] = "1D Curve",
+	[DRM_COLOROP_CTM_3X4] = "3x4 Matrix",
 };
 
 const char *drm_get_colorop_type_name(enum drm_colorop_type type)