[PATCH 2/3] OMAPDSS: DISPC: Don't allow predecimation for writeback

[Archit Taneja <archit@ti.com>]

Since writeback writes to a buffer instead of reading from one, predecimation
doesn't make sense for it. Configure the width and height predecimation limits
to 1 if the plane is writeback.

Signed-off-by: Archit Taneja <archit@ti.com>
---
 drivers/video/omap2/dss/dispc.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c
index f19cd37..664ac6f 100644
--- a/drivers/video/omap2/dss/dispc.c
+++ b/drivers/video/omap2/dss/dispc.c
@@ -2315,9 +2315,14 @@ static int dispc_ovl_calc_scaling(enum omap_plane plane,
 	if ((caps & OMAP_DSS_OVL_CAP_SCALE) = 0)
 		return -EINVAL;
 
-	*x_predecim = max_decim_limit;
-	*y_predecim = (rotation_type = OMAP_DSS_ROT_TILER &&
-			dss_has_feature(FEAT_BURST_2D)) ? 2 : max_decim_limit;
+	if (plane = OMAP_DSS_WB) {
+		*x_predecim = *y_predecim = 1;
+	} else {
+		*x_predecim = max_decim_limit;
+		*y_predecim = (rotation_type = OMAP_DSS_ROT_TILER &&
+				dss_has_feature(FEAT_BURST_2D)) ?
+				2 : max_decim_limit;
+	}
 
 	if (color_mode = OMAP_DSS_COLOR_CLUT1 ||
 	    color_mode = OMAP_DSS_COLOR_CLUT2 ||
-- 
1.7.9.5