Add Plane Degamma as a blob property and plane degamma size as
a range property.

v2: Rebase

v3: Fixed Sean, Paul's review comments. Moved the property from
mode_config to drm_plane. Created a helper function to instantiate
these properties and removed from drm_mode_create_standard_properties
Added property documentation as suggested by Daniel, Vetter.

Signed-off-by: Uma Shankar <uma.shan...@intel.com>
---
 Documentation/gpu/drm-kms.rst       |  9 +++++++++
 drivers/gpu/drm/drm_atomic.c        | 12 ++++++++++++
 drivers/gpu/drm/drm_atomic_helper.c |  6 ++++++
 drivers/gpu/drm/drm_plane.c         | 35 +++++++++++++++++++++++++++++++++++
 include/drm/drm_plane.h             | 26 ++++++++++++++++++++++++++
 5 files changed, 88 insertions(+)

diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst
index 56a3780..2c943f6 100644
--- a/Documentation/gpu/drm-kms.rst
+++ b/Documentation/gpu/drm-kms.rst
@@ -532,6 +532,15 @@ Color Management Properties
 .. kernel-doc:: drivers/gpu/drm/drm_color_mgmt.c
    :export:
 
+Plane Color Management Properties
+---------------------------
+
+.. kernel-doc:: drivers/gpu/drm/drm_plane.c
+   :doc: degamma_lut_property
+
+.. kernel-doc:: drivers/gpu/drm/drm_plane.c
+   :doc: degamma_lut_size_property
+
 Tile Group Property
 -------------------
 
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 34b7d42..409c058 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -717,6 +717,8 @@ static int drm_atomic_plane_set_property(struct drm_plane 
*plane,
 {
        struct drm_device *dev = plane->dev;
        struct drm_mode_config *config = &dev->mode_config;
+       bool replaced = false;
+       int ret;
 
        if (property == config->prop_fb_id) {
                struct drm_framebuffer *fb = drm_framebuffer_lookup(dev, NULL, 
val);
@@ -763,6 +765,12 @@ static int drm_atomic_plane_set_property(struct drm_plane 
*plane,
                state->color_encoding = val;
        } else if (property == plane->color_range_property) {
                state->color_range = val;
+       } else if (property == plane->degamma_lut_property) {
+               ret = drm_atomic_replace_property_blob_from_id(dev,
+                                       &state->degamma_lut,
+                                       val, -1, &replaced);
+               state->color_mgmt_changed |= replaced;
+               return ret;
        } else if (plane->funcs->atomic_set_property) {
                return plane->funcs->atomic_set_property(plane, state,
                                property, val);
@@ -826,6 +834,9 @@ static int drm_atomic_plane_set_property(struct drm_plane 
*plane,
                *val = state->color_encoding;
        } else if (property == plane->color_range_property) {
                *val = state->color_range;
+       } else if (property == plane->degamma_lut_property) {
+               *val = (state->degamma_lut) ?
+                       state->degamma_lut->base.id : 0;
        } else if (plane->funcs->atomic_get_property) {
                return plane->funcs->atomic_get_property(plane, state, 
property, val);
        } else {
@@ -958,6 +969,7 @@ static void drm_atomic_plane_print_state(struct drm_printer 
*p,
                   drm_get_color_encoding_name(state->color_encoding));
        drm_printf(p, "\tcolor-range=%s\n",
                   drm_get_color_range_name(state->color_range));
+       drm_printf(p, "\tcolor_mgmt_changed=%d\n", state->color_mgmt_changed);
 
        if (plane->funcs->atomic_print_state)
                plane->funcs->atomic_print_state(p, state);
diff --git a/drivers/gpu/drm/drm_atomic_helper.c 
b/drivers/gpu/drm/drm_atomic_helper.c
index ae3cbfe..d9384fd 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -3504,6 +3504,10 @@ void __drm_atomic_helper_plane_duplicate_state(struct 
drm_plane *plane,
 
        state->fence = NULL;
        state->commit = NULL;
+
+       if (state->degamma_lut)
+               drm_property_reference_blob(state->degamma_lut);
+       state->color_mgmt_changed = false;
 }
 EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);
 
@@ -3548,6 +3552,8 @@ void __drm_atomic_helper_plane_destroy_state(struct 
drm_plane_state *state)
 
        if (state->commit)
                drm_crtc_commit_put(state->commit);
+
+       drm_property_unreference_blob(state->degamma_lut);
 }
 EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
 
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index e706da6..543a693 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -474,6 +474,41 @@ int drm_mode_plane_set_obj_prop(struct drm_plane *plane,
 }
 EXPORT_SYMBOL(drm_mode_plane_set_obj_prop);
 
+/**
+ * DOC: degamma_lut_property
+ *
+ * degamma_lut_property:
+ *     Blob property which allows a userspace to provide LUT values
+ *     to apply degamma curve using the h/w plane degamma processing
+ *     engine, thereby making the content as linear for further color
+ *     processing.
+ *
+ * degamma_lut_size_property:
+ *     Range Property to indicate size of the plane degamma LUT.
+ */
+int drm_plane_color_create_prop(struct drm_device *dev,
+                               struct drm_plane *plane)
+{
+       struct drm_property *prop;
+
+       prop = drm_property_create(dev,
+                       DRM_MODE_PROP_BLOB,
+                       "PLANE_DEGAMMA_LUT", 0);
+       if (!prop)
+               return -ENOMEM;
+       plane->degamma_lut_property = prop;
+
+       prop = drm_property_create_range(dev,
+                       DRM_MODE_PROP_IMMUTABLE,
+                       "PLANE_DEGAMMA_LUT_SIZE", 0, UINT_MAX);
+       if (!prop)
+               return -ENOMEM;
+       plane->degamma_lut_size_property = prop;
+
+       return 0;
+}
+EXPORT_SYMBOL(drm_plane_color_create_prop);
+
 int drm_mode_getplane_res(struct drm_device *dev, void *data,
                          struct drm_file *file_priv)
 {
diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index f7bf4a4..03291b1 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -138,6 +138,14 @@ struct drm_plane_state {
         */
        bool visible;
 
+       /* @degamma_lut:
+        *
+        * Lookup table for converting framebuffer pixel data before apply 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 *degamma_lut;
+
        /**
         * @commit: Tracks the pending commit to prevent use-after-free 
conditions,
         * and for async plane updates.
@@ -147,6 +155,8 @@ struct drm_plane_state {
        struct drm_crtc_commit *commit;
 
        struct drm_atomic_state *state;
+
+       bool color_mgmt_changed : 1;
 };
 
 static inline struct drm_rect
@@ -499,6 +509,8 @@ enum drm_plane_type {
  * @zpos_property: zpos property for this plane
  * @rotation_property: rotation property for this plane
  * @helper_private: mid-layer private data
+ * @degamma_lut_property: Property for plane degamma LUT
+ * @degamma_lut_size_property: Property for size of plane degamma LUT
  */
 struct drm_plane {
        struct drm_device *dev;
@@ -590,6 +602,18 @@ struct drm_plane {
         * See drm_plane_create_color_properties().
         */
        struct drm_property *color_range_property;
+
+       /**
+        * @degamma_lut_property: Optional Plane property to set the LUT
+        * used to convert the framebuffer's colors to linear gamma.
+        */
+       struct drm_property *degamma_lut_property;
+
+       /**
+        * @degamma_lut_size_property: Optional Plane property for the
+        * size of the degamma LUT as supported by the driver (read-only).
+        */
+       struct drm_property *degamma_lut_size_property;
 };
 
 #define obj_to_plane(x) container_of(x, struct drm_plane, base)
@@ -629,6 +653,8 @@ static inline unsigned int drm_plane_index(struct drm_plane 
*plane)
 int drm_mode_plane_set_obj_prop(struct drm_plane *plane,
                                       struct drm_property *property,
                                       uint64_t value);
+int drm_plane_color_create_prop(struct drm_device *dev,
+                               struct drm_plane *plane);
 
 /**
  * drm_plane_find - find a &drm_plane
-- 
1.9.1

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