Scaling of the alpha layer is disabled as both the RPF and WPF are
configured to hardcode the alpha value to 255. This results in a 0 alpha
value at the UDS output, making the image invisible when alpha blended
in the BRU. Fix it by enabling scaling of the alpha layer.

Signed-off-by: Laurent Pinchart <[email protected]>
---
 drivers/media/platform/vsp1/vsp1_uds.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/media/platform/vsp1/vsp1_uds.c 
b/drivers/media/platform/vsp1/vsp1_uds.c
index 509c9fe..137299c 100644
--- a/drivers/media/platform/vsp1/vsp1_uds.c
+++ b/drivers/media/platform/vsp1/vsp1_uds.c
@@ -131,7 +131,7 @@ static int uds_s_stream(struct v4l2_subdev *subdev, int 
enable)
                return 0;
 
        /* Enable multi-tap scaling. */
-       vsp1_uds_write(uds, VI6_UDS_CTRL, VI6_UDS_CTRL_BC);
+       vsp1_uds_write(uds, VI6_UDS_CTRL, VI6_UDS_CTRL_AON | VI6_UDS_CTRL_BC);
 
        vsp1_uds_write(uds, VI6_UDS_PASS_BWIDTH,
                       (uds_passband_width(uds->hscale)
@@ -139,7 +139,6 @@ static int uds_s_stream(struct v4l2_subdev *subdev, int 
enable)
                       (uds_passband_width(uds->vscale)
                                << VI6_UDS_PASS_BWIDTH_V_SHIFT));
 
-
        /* Set the scaling ratios and the output size. */
        format = &uds->entity.formats[UDS_PAD_SOURCE];
 
-- 
1.8.3.2

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