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authorLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>2013-06-14 20:54:16 +0200
committerLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>2013-08-09 23:17:42 +0200
commit9e7db06d3ac0ffcd866e5b7114f9a7ba12f7b6ac (patch)
treed3ef3b9712f72d06d03e21ea16063af78913d740 /drivers
parentdrm/rcar-du: Support per-CRTC clock and IRQ (diff)
downloadlinux-9e7db06d3ac0ffcd866e5b7114f9a7ba12f7b6ac.tar.xz
linux-9e7db06d3ac0ffcd866e5b7114f9a7ba12f7b6ac.zip
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')
-rw-r--r--drivers/gpu/drm/rcar-du/rcar_du_plane.c9
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 a65f81ddf51d..38ebd20e4e8d 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);