[RFC PATCH v4 10/42] drm/colorop: Add TYPE property

[Harry Wentland <harry.wentland@amd.com>]

Add a read-only TYPE property. The TYPE specifies the colorop
type, such as enumerated curve, 1D LUT, CTM, 3D LUT, PWL LUT,
etc.

v4:
 - Use enum property for TYPE (Pekka)

v3:
 - Make TYPE a range property
 - Move enum drm_colorop_type to uapi header
 - Fix drm_get_colorop_type_name description

For now we're only introducing an enumerated 1D LUT type to
illustrate the concept.

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
---
 drivers/gpu/drm/drm_atomic.c      |  4 +--
 drivers/gpu/drm/drm_atomic_uapi.c |  8 +++++-
 drivers/gpu/drm/drm_colorop.c     | 44 ++++++++++++++++++++++++++++++-
 include/drm/drm_colorop.h         | 17 +++++++++++-
 include/uapi/drm/drm_mode.h       |  4 +++
 5 files changed, 72 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 62e87e6a9653..b400e32c9d39 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -634,8 +634,8 @@ drm_atomic_get_colorop_state(struct drm_atomic_state *state,
 	state->colorops[index].new_state = colorop_state;
 	colorop_state->state = state;
 
-	drm_dbg_atomic(colorop->dev, "Added [COLOROP:%d] %p state to %p\n",
-		       colorop->base.id, colorop_state, state);
+	drm_dbg_atomic(colorop->dev, "Added [COLOROP:%d:%d] %p state to %p\n",
+		       colorop->base.id, colorop->type, colorop_state, state);
 
 	return colorop_state;
 }
diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index 1f9b6dfa8ca7..e3067c095c72 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -660,7 +660,13 @@ drm_atomic_colorop_get_property(struct drm_colorop *colorop,
 		const struct drm_colorop_state *state,
 		struct drm_property *property, uint64_t *val)
 {
-	return -EINVAL;
+	if (property == colorop->type_property) {
+		*val = colorop->type;
+	} else {
+		return -EINVAL;
+	}
+
+	return 0;
 }
 
 static int drm_atomic_set_writeback_fb_for_connector(
diff --git a/drivers/gpu/drm/drm_colorop.c b/drivers/gpu/drm/drm_colorop.c
index a295ab96aee1..3a07a8fe2842 100644
--- a/drivers/gpu/drm/drm_colorop.c
+++ b/drivers/gpu/drm/drm_colorop.c
@@ -32,12 +32,17 @@
 
 /* TODO big colorop doc, including properties, etc. */
 
+static const struct drm_prop_enum_list drm_colorop_type_enum_list[] = {
+	{ DRM_COLOROP_1D_CURVE, "1D Curve" },
+};
+
 /* Init Helpers */
 
 int drm_colorop_init(struct drm_device *dev, struct drm_colorop *colorop,
-		     struct drm_plane *plane)
+		     struct drm_plane *plane, enum drm_colorop_type type)
 {
 	struct drm_mode_config *config = &dev->mode_config;
+	struct drm_property *prop;
 	int ret = 0;
 
 	ret = drm_mode_object_add(dev, &colorop->base, DRM_MODE_OBJECT_COLOROP);
@@ -46,12 +51,29 @@ int drm_colorop_init(struct drm_device *dev, struct drm_colorop *colorop,
 
 	colorop->base.properties = &colorop->properties;
 	colorop->dev = dev;
+	colorop->type = type;
 	colorop->plane = plane;
 
 	list_add_tail(&colorop->head, &config->colorop_list);
 	colorop->index = config->num_colorop++;
 
 	/* add properties */
+
+	/* type */
+	prop = drm_property_create_enum(dev,
+					DRM_MODE_PROP_IMMUTABLE,
+					"TYPE", drm_colorop_type_enum_list,
+					ARRAY_SIZE(drm_colorop_type_enum_list));
+
+	if (!prop)
+		return -ENOMEM;
+
+	colorop->type_property = prop;
+
+	drm_object_attach_property(&colorop->base,
+				   colorop->type_property,
+				   colorop->type);
+
 	return ret;
 }
 EXPORT_SYMBOL(drm_colorop_init);
@@ -150,3 +172,23 @@ void drm_colorop_reset(struct drm_colorop *colorop)
 		__drm_colorop_reset(colorop, colorop->state);
 }
 EXPORT_SYMBOL(drm_colorop_reset);
+
+
+static const char * const colorop_type_name[] = {
+	[DRM_COLOROP_1D_CURVE] = "1D Curve",
+};
+
+/**
+ * drm_get_colorop_type_name - return a string for colorop type
+ * @type: colorop type to compute name of
+ *
+ * In contrast to the other drm_get_*_name functions this one here returns a
+ * const pointer and hence is threadsafe.
+ */
+const char *drm_get_colorop_type_name(enum drm_colorop_type type)
+{
+	if (WARN_ON(type >= ARRAY_SIZE(colorop_type_name)))
+		return "unknown";
+
+	return colorop_type_name[type];
+}
diff --git a/include/drm/drm_colorop.h b/include/drm/drm_colorop.h
index e611f830f986..cb98c55f8387 100644
--- a/include/drm/drm_colorop.h
+++ b/include/drm/drm_colorop.h
@@ -103,6 +103,21 @@ struct drm_colorop {
 	/** @properties: property tracking for this plane */
 	struct drm_object_properties properties;
 
+	/**
+	 * @type:
+	 *
+	 * Read-only
+	 * Type of color operation
+	 */
+	enum drm_colorop_type type;
+
+	/**
+	 * @type_property:
+	 *
+	 * Read-only "TYPE" property for specifying the type of
+	 * this color operation. The type is enum drm_colorop_type.
+	 */
+	struct drm_property *type_property;
 };
 
 #define obj_to_colorop(x) container_of(x, struct drm_colorop, base)
@@ -127,7 +142,7 @@ static inline struct drm_colorop *drm_colorop_find(struct drm_device *dev,
 }
 
 int drm_colorop_init(struct drm_device *dev, struct drm_colorop *colorop,
-		     struct drm_plane *plane);
+		     struct drm_plane *plane, enum drm_colorop_type type);
 
 struct drm_colorop_state *
 drm_atomic_helper_colorop_duplicate_state(struct drm_colorop *colorop);
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 9e8f383935db..0cbd6bef52bc 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -866,6 +866,10 @@ struct drm_color_lut {
 	__u16 reserved;
 };
 
+enum drm_colorop_type {
+	DRM_COLOROP_1D_CURVE
+};
+
 /**
  * struct hdr_metadata_infoframe - HDR Metadata Infoframe Data.
  *
-- 
2.44.0