drm: Introduce solid fill DRM plane property

Document and add support for solid_fill property to drm_plane. In
addition, add support for setting and getting the values for solid_fill.

To enable solid fill planes, userspace must assign a property blob to
the "solid_fill" plane property containing the following information:

struct drm_mode_solid_fill {
	u32 r, g, b, pad;
};

Acked-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Sebastian Wick <sebastian@sebastianwick.net>
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231027-solid-fill-v7-2-780188bfa7b2@quicinc.com

drivers/gpu/drm/drm_atomic_state_helper.c

@@ -254,6 +254,11 @@ void __drm_atomic_helper_plane_state_reset(struct drm_plane_state *plane_state,
 	plane_state->pixel_blend_mode = DRM_MODE_BLEND_PREMULTI;
 	plane_state->pixel_source = DRM_PLANE_PIXEL_SOURCE_FB;
 
+	if (plane_state->solid_fill_blob) {
+		drm_property_blob_put(plane_state->solid_fill_blob);
+		plane_state->solid_fill_blob = NULL;
+	}
+
 	if (plane->color_encoding_property) {
 		if (!drm_object_property_get_default_value(&plane->base,
 							   plane->color_encoding_property,
@@ -350,6 +355,9 @@ void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
 	if (state->fb)
 		drm_framebuffer_get(state->fb);
 
+	if (state->solid_fill_blob)
+		drm_property_blob_get(state->solid_fill_blob);
+
 	state->fence = NULL;
 	state->commit = NULL;
 	state->fb_damage_clips = NULL;
@@ -399,6 +407,7 @@ void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
 		drm_crtc_commit_put(state->commit);
 
 	drm_property_blob_put(state->fb_damage_clips);
+	drm_property_blob_put(state->solid_fill_blob);
 }
 EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
 

drivers/gpu/drm/drm_atomic_uapi.c

@@ -316,6 +316,20 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
 }
 EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
 
+static void drm_atomic_set_solid_fill_prop(struct drm_plane_state *state)
+{
+	struct drm_mode_solid_fill *user_info;
+
+	if (!state->solid_fill_blob)
+		return;
+
+	user_info = (struct drm_mode_solid_fill *)state->solid_fill_blob->data;
+
+	state->solid_fill.r = user_info->r;
+	state->solid_fill.g = user_info->g;
+	state->solid_fill.b = user_info->b;
+}
+
 static void set_out_fence_for_crtc(struct drm_atomic_state *state,
 				   struct drm_crtc *crtc, s32 __user *fence_ptr)
 {
@@ -564,6 +578,15 @@ static int drm_atomic_plane_set_property(struct drm_plane *plane,
 		state->src_h = val;
 	} else if (property == plane->pixel_source_property) {
 		state->pixel_source = val;
+	} else if (property == plane->solid_fill_property) {
+		ret = drm_atomic_replace_property_blob_from_id(dev,
+				&state->solid_fill_blob,
+				val, sizeof(struct drm_mode_solid_fill),
+				-1, &replaced);
+		if (ret)
+			return ret;
+
+		drm_atomic_set_solid_fill_prop(state);
 	} else if (property == plane->alpha_property) {
 		state->alpha = val;
 	} else if (property == plane->blend_mode_property) {
@@ -654,6 +677,9 @@ drm_atomic_plane_get_property(struct drm_plane *plane,
 		*val = state->src_h;
 	} else if (property == plane->pixel_source_property) {
 		*val = state->pixel_source;
+	} else if (property == plane->solid_fill_property) {
+		*val = state->solid_fill_blob ?
+			state->solid_fill_blob->base.id : 0;
 	} else if (property == plane->alpha_property) {
 		*val = state->alpha;
 	} else if (property == plane->blend_mode_property) {

drivers/gpu/drm/drm_blend.c

@@ -204,6 +204,10 @@
  *	"FB":
  *		Framebuffer source set by the "FB_ID" property.
  *
+ * solid_fill:
+ *	solid_fill is set up with drm_plane_create_solid_fill_property(). It
+ *	contains pixel data that drivers can use to fill a plane.
+ *
  * Note that all the property extensions described here apply either to the
  * plane or the CRTC (e.g. for the background color, which currently is not
  * exposed and assumed to be black).
@@ -709,3 +713,29 @@ int drm_plane_create_pixel_source_property(struct drm_plane *plane,
 	return 0;
 }
 EXPORT_SYMBOL(drm_plane_create_pixel_source_property);
+
+/**
+ * drm_plane_create_solid_fill_property - create a new solid_fill property
+ * @plane: drm plane
+ *
+ * This creates a new property blob that holds pixel data for solid fill planes.
+ * The property is exposed to userspace as a property blob called "solid_fill".
+ *
+ * For information on what the blob contains, see `drm_mode_solid_fill`.
+ */
+int drm_plane_create_solid_fill_property(struct drm_plane *plane)
+{
+	struct drm_property *prop;
+
+	prop = drm_property_create(plane->dev,
+			DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
+			"solid_fill", 0);
+	if (!prop)
+		return -ENOMEM;
+
+	drm_object_attach_property(&plane->base, prop, 0);
+	plane->solid_fill_property = prop;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_plane_create_solid_fill_property);

include/drm/drm_blend.h

@@ -60,4 +60,5 @@ int drm_plane_create_blend_mode_property(struct drm_plane *plane,
 					 unsigned int supported_modes);
 int drm_plane_create_pixel_source_property(struct drm_plane *plane,
 					   unsigned long extra_sources);
+int drm_plane_create_solid_fill_property(struct drm_plane *plane);
 #endif

include/drm/drm_plane.h

@@ -46,6 +46,18 @@ enum drm_plane_pixel_source {
 	DRM_PLANE_PIXEL_SOURCE_MAX
 };
 
+/**
+ * struct solid_fill_property - RGB values for solid fill plane
+ *
+ * TODO: Add solid fill source and corresponding pixel source
+ *       that supports RGBA color
+ */
+struct drm_solid_fill {
+	uint32_t r;
+	uint32_t g;
+	uint32_t b;
+};
+
 /**
  * struct drm_plane_state - mutable plane state
  *
@@ -134,6 +146,23 @@ struct drm_plane_state {
 	 */
 	enum drm_plane_pixel_source pixel_source;
 
+	/**
+	 * @solid_fill_blob:
+	 *
+	 * Blob containing relevant information for a solid fill plane
+	 * including RGB color values. See
+	 * drm_plane_create_solid_fill_property() for more details.
+	 */
+	struct drm_property_blob *solid_fill_blob;
+
+	/**
+	 * @solid_fill:
+	 *
+	 * Pixel data for solid fill planes. See
+	 * drm_plane_create_solid_fill_property() for more details.
+	 */
+	struct drm_solid_fill solid_fill;
+
 	/**
 	 * @alpha:
 	 * Opacity of the plane with 0 as completely transparent and 0xffff as
@@ -734,6 +763,13 @@ struct drm_plane {
 	 */
 	struct drm_property *pixel_source_property;
 
+	/**
+	 * @solid_fill_property:
+	 * Optional solid_fill property for this plane. See
+	 * drm_plane_create_solid_fill_property().
+	 */
+	struct drm_property *solid_fill_property;
+
 	/**
 	 * @alpha_property:
 	 * Optional alpha property for this plane. See

include/uapi/drm/drm_mode.h

@@ -259,6 +259,30 @@ struct drm_mode_modeinfo {
 	char name[DRM_DISPLAY_MODE_LEN];
 };
 
+/**
+ * struct drm_mode_solid_fill - User info for solid fill planes
+ *
+ * This is the userspace API solid fill information structure.
+ *
+ * Userspace can enable solid fill planes by assigning the plane "solid_fill"
+ * property to a blob containing a single drm_mode_solid_fill struct populated with an RGB323232
+ * color and setting the pixel source to "SOLID_FILL".
+ *
+ * For information on the plane property, see drm_plane_create_solid_fill_property()
+ *
+ * @r: Red color value of single pixel
+ * @g: Green color value of single pixel
+ * @b: Blue color value of single pixel
+ * @pad: padding, must be zero
+ */
+struct drm_mode_solid_fill {
+	__u32 r;
+	__u32 g;
+	__u32 b;
+	__u32 pad;
+};
+
+
 struct drm_mode_card_res {
 	__u64 fb_id_ptr;
 	__u64 crtc_id_ptr;