OMAPDSS: DISPC: Don't allow predecimation for writeback

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>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c
index 36ecb91b2452a1e8c396829788acfc13a36f7f15..34ada45dfa84b3554e3d8224a63b2eefecb5d577 100644 (file)
--- 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 ||