[RFC,v2,18/22] drm: Add Plane Gamma Lut property

Commit Message

Shankar, Uma Sept. 6, 2021, 9:39 p.m. UTC

Add Plane Gamma Lut as a blob property.

Signed-off-by: Uma Shankar <[e-mail]>
---
 drivers/gpu/drm/drm_atomic_state_helper.c |  3 +++
 drivers/gpu/drm/drm_atomic_uapi.c         | 10 ++++++++++
 drivers/gpu/drm/drm_color_mgmt.c          | 18 ++++++++++++++++++
 include/drm/drm_plane.h                   | 14 ++++++++++++++
 4 files changed, 45 insertions(+)

Patch

diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
index fafb8af1c9cb..7ddf6e4b956b 100644
--- a/drivers/gpu/drm/drm_atomic_state_helper.c
+++ b/drivers/gpu/drm/drm_atomic_state_helper.c
@@ -316,6 +316,8 @@  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;
 }
@@ -366,6 +368,7 @@  void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
 	drm_property_blob_put(state->fb_damage_clips);
 	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_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index b5abf03c5d51..a32557a4e0d3 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -615,6 +615,13 @@  static int drm_atomic_plane_set_property(struct drm_plane *plane,
 		return ret;
 	} else if (property == plane->gamma_mode_property) {
 		state->gamma_mode = val;
+	} else if (property == plane->gamma_lut_property) {
+		ret = drm_atomic_replace_property_blob_from_id(dev,
+					&state->gamma_lut,
+					val, -1, sizeof(struct drm_color_lut_ext),
+					&replaced);
+		state->color_mgmt_changed |= replaced;
+		return ret;
 	} else if (property == config->prop_fb_damage_clips) {
 		ret = drm_atomic_replace_property_blob_from_id(dev,
 					&state->fb_damage_clips,
@@ -690,6 +697,9 @@  drm_atomic_plane_get_property(struct drm_plane *plane,
 		*val = (state->ctm) ? state->ctm->base.id : 0;
 	} else if (property == plane->gamma_mode_property) {
 		*val = state->gamma_mode;
+	} else if (property == plane->gamma_lut_property) {
+		*val = (state->gamma_lut) ?
+			state->gamma_lut->base.id : 0;
 	} else if (property == config->prop_fb_damage_clips) {
 		*val = (state->fb_damage_clips) ?
 			state->fb_damage_clips->base.id : 0;
diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
index 02367e691cf3..b5b3ff7f654d 100644
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -613,6 +613,11 @@  EXPORT_SYMBOL(drm_plane_create_color_properties);
  *     to query and get the plane gamma color caps and choose the
  *     appropriate gamma mode and create lut values accordingly
  *
+ * gamma_lut_property:
+ *	Blob property which allows a userspace to provide LUT values
+ *	to apply gamma curve using the h/w plane degamma processing
+ *	engine, thereby making the content as non-linear.
+ *
  */
 int drm_plane_create_color_mgmt_properties(struct drm_device *dev,
 					   struct drm_plane *plane,
@@ -648,6 +653,13 @@  int drm_plane_create_color_mgmt_properties(struct drm_device *dev,
 
 	plane->gamma_mode_property = prop;
 
+	prop = drm_property_create(dev, DRM_MODE_PROP_BLOB,
+				   "PLANE_GAMMA_LUT", 0);
+	if (!prop)
+		return -ENOMEM;
+
+	plane->gamma_lut_property = prop;
+
 	return 0;
 }
 EXPORT_SYMBOL(drm_plane_create_color_mgmt_properties);
@@ -685,6 +697,12 @@  void drm_plane_attach_gamma_properties(struct drm_plane *plane)
 
 	drm_object_attach_property(&plane->base,
 				   plane->gamma_mode_property, 0);
+
+	if (!plane->gamma_lut_property)
+		return;
+
+	drm_object_attach_property(&plane->base,
+				   plane->gamma_lut_property, 0);
 }
 EXPORT_SYMBOL(drm_plane_attach_gamma_properties);
 
diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index 9081867ecbd1..8b1f506bc5d3 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -270,6 +270,14 @@  struct drm_plane_state {
 	 */
 	u32 gamma_mode;
 
+	/* @gamma_lut:
+	 *
+	 * Lookup table for converting framebuffer pixel data after applying the
+	 * color conversion matrix @ctm. See drm_plane_enable_color_mgmt(). The
+	 * blob (if not NULL) is an array of &struct drm_color_lut_ext.
+	 */
+	struct drm_property_blob *gamma_lut;
+
 	u8 color_mgmt_changed : 1;
 };
 
@@ -807,6 +815,12 @@  struct drm_plane {
 	 * used to convert the framebuffer's colors to non-linear gamma.
 	 */
 	struct drm_property *gamma_mode_property;
+
+	/**
+	 * @gamma_lut_property: Optional Plane property to set the LUT
+	 * used to convert the framebuffer's colors to non-linear gamma.
+	 */
+	struct drm_property *gamma_lut_property;
 };
 
 #define obj_to_plane(x) container_of(x, struct drm_plane, base)