[PATCH 1/3] drm/vc4: Set PPF scaling when the source image is only vertically scaled

[Boris Brezillon <boris.brezillon@bootlin.com>]

The source image might be only vertically scaled, and in this case
->is_unity will be false, but we'd still have to force ->x_scaling[0]
to VC4_SCALING_PPF for YUV conversion to work properly.

Let's replace the ->is_unity test by->x_scaling[0] == VC4_SCALING_NONE
to cope with that.

Fixes: 658d8cbd07da ("drm/vc4: Fix the "no scaling" case on multi-planar YUV formats")
Cc: <stable@vger.kernel.org>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
---
 drivers/gpu/drm/vc4/vc4_plane.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
index 60d5ad19cedd..32b7b9f47c5d 100644
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -318,7 +318,7 @@ static int vc4_plane_setup_clipping_and_scaling(struct drm_plane_state *state)
 		 * even on a plane that's otherwise 1:1. Looks like only PPF
 		 * works in that case, so let's pick that one.
 		 */
-		if (vc4_state->is_unity)
+		if (vc4_state->x_scaling[0] == VC4_SCALING_NONE)
 			vc4_state->x_scaling[0] = VC4_SCALING_PPF;
 	} else {
 		vc4_state->is_yuv = false;
-- 
2.17.1