The R8A7790 DU documentation contains further information regarding the
plane Y source coordinate. Update the comment accordingly.
Signed-off-by: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com>
---
drivers/gpu/drm/rcar-du/rcar_du_plane.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.c
b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
index a65f81d..38ebd20 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_plane.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
@@ -103,9 +103,12 @@ void rcar_du_plane_update_base(struct rcar_du_plane *plane)
struct rcar_du_device *rcdu = plane->dev;
unsigned int index = plane->hwindex;
- /* According to the datasheet the Y position is expressed in raster line
- * units. However, 32bpp formats seem to require a doubled Y position
- * value. Similarly, for the second plane, NV12 and NV21 formats seem to
+ /* The Y position is expressed in raster line units and must be doubled
+ * for 32bpp formats, according to the R8A7790 datasheet. No mention of
+ * doubling the Y position is found in the R8A7779 datasheet, but the
+ * rule seems to apply there as well.
+ *
+ * Similarly, for the second plane, NV12 and NV21 formats seem to
* require a halved Y position value.
*/
rcar_du_plane_write(rcdu, index, PnSPXR, plane->src_x);
--
1.8.1.5
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