[PATCH v3 1/2] drm: Add writeback_dest_w,h properties

[Ben Davis]

Add new properties to specify width and height for writeback.

Signed-off-by: Ben Davis <ben.davis at arm.com>
---
 drivers/gpu/drm/drm_atomic_uapi.c |  8 ++++++++
 drivers/gpu/drm/drm_writeback.c   | 30 ++++++++++++++++++++++++++++++
 include/drm/drm_connector.h       |  4 ++++
 include/drm/drm_mode_config.h     | 10 ++++++++++
 4 files changed, 52 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index d520a04..064d986 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -765,6 +765,10 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector,
 			return -EINVAL;
 		}
 		state->content_protection = val;
+	} else if (property == config->prop_writeback_dest_w) {
+		state->writeback_dest_w = val;
+	} else if (property == config->prop_writeback_dest_h) {
+		state->writeback_dest_h = val;
 	} else if (property == config->writeback_fb_id_property) {
 		struct drm_framebuffer *fb = drm_framebuffer_lookup(dev, NULL, val);
 		int ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
@@ -837,6 +841,10 @@ drm_atomic_connector_get_property(struct drm_connector *connector,
 		*val = state->scaling_mode;
 	} else if (property == connector->content_protection_property) {
 		*val = state->content_protection;
+	} else if (property == config->prop_writeback_dest_w) {
+		*val = state->writeback_dest_w;
+	} else if (property == config->prop_writeback_dest_h) {
+		*val = state->writeback_dest_h;
 	} else if (property == config->writeback_fb_id_property) {
 		/* Writeback framebuffer is one-shot, write and forget */
 		*val = 0;
diff --git a/drivers/gpu/drm/drm_writeback.c b/drivers/gpu/drm/drm_writeback.c
index c20e6fe..2d7ee22 100644
--- a/drivers/gpu/drm/drm_writeback.c
+++ b/drivers/gpu/drm/drm_writeback.c
@@ -74,6 +74,14 @@
  *	applications making use of writeback connectors *always* retrieve an
  *	out-fence for the commit and use it appropriately.
  *	From userspace, this property will always read as zero.
+ *
+ *  "WRITEBACK_DEST_W":
+ *	The width of the composition to write back. 0 acts as default. If
+ *	non-zero the composition will be scaled to match the given width.
+ *
+ *  "WRITEBACK_DEST_H":
+ *	The height of the composition to write back. 0 acts as default. If
+ *	non-zero the composition will be scaled to match the given height.
  */
 
 #define fence_to_wb_connector(x) container_of(x->lock, \
@@ -141,6 +149,22 @@ static int create_writeback_properties(struct drm_device *dev)
 		dev->mode_config.writeback_out_fence_ptr_property = prop;
 	}
 
+	if (!dev->mode_config.prop_writeback_dest_w) {
+		prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
+						 "WRITEBACK_DEST_W", 1, UINT_MAX);
+		if (!prop)
+			return -ENOMEM;
+		dev->mode_config.prop_writeback_dest_w = prop;
+	}
+
+	if (!dev->mode_config.prop_writeback_dest_h) {
+		prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
+						 "WRITEBACK_DEST_H", 1, UINT_MAX);
+		if (!prop)
+			return -ENOMEM;
+		dev->mode_config.prop_writeback_dest_h = prop;
+	}
+
 	return 0;
 }
 
@@ -225,6 +249,12 @@ int drm_writeback_connector_init(struct drm_device *dev,
 	drm_object_attach_property(&connector->base,
 				   config->writeback_pixel_formats_property,
 				   blob->base.id);
+
+	drm_object_attach_property(&connector->base,
+				   config->prop_writeback_dest_w, 0);
+	drm_object_attach_property(&connector->base,
+				   config->prop_writeback_dest_h, 0);
+
 	wb_connector->pixel_formats_blob_ptr = blob;
 
 	return 0;
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 8fe22ab..c956960 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -515,6 +515,10 @@ struct drm_connector_state {
 	 */
 	struct drm_writeback_job *writeback_job;
 
+	/** @writeback_dest_w: width of plane to write to wb buffer */
+	/** @writeback_dest_h: height of plane to write to wb buffer */
+	uint32_t writeback_dest_w, writeback_dest_h;
+
 	/**
 	 * @max_requested_bpc: Connector property to limit the maximum bit
 	 * depth of the pixels.
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 7f60e8e..5e30a58 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -622,6 +622,16 @@ struct drm_mode_config {
 	 */
 	struct drm_property *prop_crtc_h;
 	/**
+	 * @prop_writeback_dest_w: Writeback connector property for the plane
+	 * destination position in the writeback buffer.
+	 */
+	struct drm_property *prop_writeback_dest_w;
+	/**
+	 * @prop_writeback_dest_h: Writeback connector property for the plane
+	 * destination position in the writeback buffer.
+	 */
+	struct drm_property *prop_writeback_dest_h;
+	/**
 	 * @prop_fb_id: Default atomic plane property to specify the
 	 * &drm_framebuffer.
 	 */
-- 
2.7.4