[RFC v1 3/6] drm: Add Plane Gamma properties

[Uma Shankar]

Add plane gamma as blob property and size as a
range property.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/drm_atomic.c        |    8 ++++++++
 drivers/gpu/drm/drm_atomic_helper.c |    3 +++
 drivers/gpu/drm/drm_mode_config.c   |   14 ++++++++++++++
 include/drm/drm_mode_config.h       |   11 +++++++++++
 include/drm/drm_plane.h             |    9 +++++++++
 5 files changed, 45 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index ba88f50..f5c7188 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -777,6 +777,12 @@ static int drm_atomic_plane_set_property(struct drm_plane *plane,
 					&replaced);
 		state->color_mgmt_changed |= replaced;
 		return ret;
+	} else if (property == config->plane_gamma_lut_property) {
+		ret = drm_atomic_replace_property_blob_from_id(dev,
+					&state->gamma_lut,
+					val, -1, &replaced);
+		state->color_mgmt_changed |= replaced;
+		return ret;
 	} else {
 		return -EINVAL;
 	}
@@ -840,6 +846,8 @@ static int drm_atomic_plane_set_property(struct drm_plane *plane,
 			state->degamma_lut->base.id : 0;
 	} else if (property == config->plane_ctm_property) {
 		*val = (state->ctm) ? state->ctm->base.id : 0;
+	} else if (property == config->plane_gamma_lut_property) {
+		*val = (state->gamma_lut) ? state->gamma_lut->base.id : 0;
 	} else {
 		return -EINVAL;
 	}
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index c6d08d3..3bf39a5 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -3391,6 +3391,8 @@ void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
 		drm_property_blob_get(state->degamma_lut);
 	if (state->ctm)
 		drm_property_blob_get(state->ctm);
+	if (state->gamma_lut)
+		drm_property_blob_get(state->gamma_lut);
 	state->color_mgmt_changed = false;
 }
 EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);
@@ -3439,6 +3441,7 @@ void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
 
 	drm_property_blob_put(state->degamma_lut);
 	drm_property_blob_put(state->ctm);
+	drm_property_blob_put(state->gamma_lut);
 }
 EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
 
diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index 98068c5..c8f6b49 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -365,6 +365,20 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
 		return -ENOMEM;
 	dev->mode_config.plane_ctm_property = prop;
 
+	prop = drm_property_create(dev,
+			DRM_MODE_PROP_BLOB,
+			"PLANE_GAMMA_LUT", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.plane_gamma_lut_property = prop;
+
+	prop = drm_property_create_range(dev,
+			DRM_MODE_PROP_IMMUTABLE,
+			"PLANE_GAMMA_LUT_SIZE", 0, UINT_MAX);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.plane_gamma_lut_size_property = prop;
+
 	return 0;
 }
 
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 2bee0b5..f509b06 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -746,6 +746,17 @@ struct drm_mode_config {
 	 * degamma LUT.
 	 */
 	struct drm_property *plane_ctm_property;
+	/**
+	 * @plane_gamma_lut_property: Optional Plane property to set the LUT
+	 * used to convert the colors, after the CTM matrix, to the common
+	 * gamma space chosen for blending.
+	 */
+	struct drm_property *plane_gamma_lut_property;
+	/**
+	 * @plane_gamma_lut_size_property: Optional Plane property for the size
+	 * of the gamma LUT as supported by the driver (read-only).
+	 */
+	struct drm_property *plane_gamma_lut_size_property;
 
 	/**
 	 * @suggested_x_property: Optional connector property with a hint for
diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index 8478d5f..172d0c1 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -140,6 +140,15 @@ struct drm_plane_state {
 	struct drm_property_blob *ctm;
 
 	/**
+	 * @gamma_lut:
+	 *
+	 * Lookup table for converting pixel data after the color conversion
+	 * matrix @ctm.  See drm_plane_enable_color_mgmt(). The blob (if not
+	 * NULL) is an array of &struct drm_color_lut.
+	 */
+	struct drm_property_blob *gamma_lut;
+
+	/**
 	 * @commit: Tracks the pending commit to prevent use-after-free conditions,
 	 * and for async plane updates.
 	 *
-- 
1.7.9.5