[PATCHv2 1/3] drm/plane: Add new plane property IN_FORMATS_ASYNC

[Arun R Murthy <arun.r.murthy@intel.com>]

There exists a property IN_FORMATS which exposes the plane supported
modifiers/formats to the user. In some platforms when asynchronous flips
are used all of modifiers/formats mentioned in IN_FORMATS are not
supported. This patch adds a new plane property IN_FORMATS_ASYNC to
expose the async flips supported modifiers/formats so that user can use
this information ahead and done flips with unsupported
formats/modifiers. This will save flips failures.

v2: Remove async variable from drm_plane (Ville)

Signed-off-by: Arun R Murthy <arun.r.murthy@intel.com>
---
 drivers/gpu/drm/drm_mode_config.c | 7 +++++++
 drivers/gpu/drm/drm_plane.c       | 6 ++++++
 include/drm/drm_mode_config.h     | 6 ++++++
 3 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index 37d2e0a4ef4b..cff189a2e751 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -379,6 +379,13 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
 		return -ENOMEM;
 	dev->mode_config.size_hints_property = prop;
 
+	prop = drm_property_create(dev,
+				   DRM_MODE_PROP_IMMUTABLE | DRM_MODE_PROP_BLOB,
+				   "IN_FORMATS_ASYNC", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.async_modifiers_property = prop;
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index a28b22fdd7a4..416818e54ccf 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -141,6 +141,12 @@
  *     various bugs in this area with inconsistencies between the capability
  *     flag and per-plane properties.
  *
+ * IN_FORMATS_ASYNC:
+ *     Blob property which contains the set of buffer format and modifier
+ *     pairs supported by this plane for asynchronous flips. The blob is a struct
+ *     drm_format_modifier_blob. Without this property the plane doesn't
+ *     support buffers with modifiers. Userspace cannot change this property.
+ *
  * SIZE_HINTS:
  *     Blob property which contains the set of recommended plane size
  *     which can used for simple "cursor like" use cases (eg. no scaling).
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 271765e2e9f2..0c116d6dfd27 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -936,6 +936,12 @@ struct drm_mode_config {
 	 */
 	struct drm_property *modifiers_property;
 
+	/**
+	 * @async_modifiers_property: Plane property to list support modifier/format
+	 * combination for asynchronous flips.
+	 */
+	struct drm_property *async_modifiers_property;
+
 	/**
 	 * @size_hints_property: Plane SIZE_HINTS property.
 	 */
-- 
2.25.1