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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>
This commit is contained in:
Laurent Pinchart 2013-06-14 20:54:16 +02:00
parent f66ee304ae
commit 9e7db06d3a
1 changed files with 6 additions and 3 deletions
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9
drivers/gpu/drm/rcar-du/rcar_du_plane.c
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@ -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);