drm/vc4: Reset ->{x, y}_scaling[1] when dealing with uniplanar formats

commit a6a00918d4ad8718c3ccde38c02cec17f116b2fd upstream.

This is needed to ensure ->is_unity is correct when the plane was
previously configured to output a multi-planar format with scaling
enabled, and is then being reconfigured to output a uniplanar format.

Fixes: fc04023fafec ("drm/vc4: Add support for YUV planes.")
Cc: <stable@vger.kernel.org>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20180724133601.32114-1-boris.brezillon@bootlin.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
index 77c5626..17590cb 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -352,6 +352,9 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
                        vc4_state->x_scaling[0] = VC4_SCALING_TPZ;
                if (vc4_state->y_scaling[0] == VC4_SCALING_NONE)
                        vc4_state->y_scaling[0] = VC4_SCALING_TPZ;
+       } else {
+               vc4_state->x_scaling[1] = VC4_SCALING_NONE;
+               vc4_state->y_scaling[1] = VC4_SCALING_NONE;
        }
 
        vc4_state->is_unity = (vc4_state->x_scaling[0] == VC4_SCALING_NONE &&