diff options
author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2013-06-14 20:54:16 +0200 |
---|---|---|
committer | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2013-08-09 23:17:42 +0200 |
commit | 9e7db06d3ac0ffcd866e5b7114f9a7ba12f7b6ac (patch) | |
tree | d3ef3b9712f72d06d03e21ea16063af78913d740 /drivers/gpu/drm/rcar-du | |
parent | f66ee304ae8990bd31fa639b775a840d6757d746 (diff) | |
download | op-kernel-dev-9e7db06d3ac0ffcd866e5b7114f9a7ba12f7b6ac.zip op-kernel-dev-9e7db06d3ac0ffcd866e5b7114f9a7ba12f7b6ac.tar.gz |
drm/rcar-du: Clarify comment regarding plane Y source coordinate
The R8A7790 DU documentation contains further information regarding the
plane Y source coordinate. Update the comment accordingly.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Diffstat (limited to 'drivers/gpu/drm/rcar-du')
-rw-r--r-- | drivers/gpu/drm/rcar-du/rcar_du_plane.c | 9 |
1 files 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); |