From: Liviu Dudau <Liviu.Dudau@arm.com>
Date: Fri, 15 Dec 2017 16:42:19 +0000
Subject: drm/mali-dp: Don't enable scaling engine for planes that only rotate.
Git-commit: e0521c05c13cca593d386533c61a646ab3dbcfd9
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Currently the scaling engine gets enabled for a plane where the input
size differs from the composition size. As rotation is done natively
by the plane's hardware layer, we don't need the scaling engine to be
enabled.

Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/arm/malidp_planes.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/arm/malidp_planes.c
+++ b/drivers/gpu/drm/arm/malidp_planes.c
@@ -154,8 +154,14 @@ static int malidp_se_check_scaling(struc
 	if (ret)
 		return ret;
 
-	src_w = state->src_w >> 16;
-	src_h = state->src_h >> 16;
+	if (state->rotation & MALIDP_ROTATED_MASK) {
+		src_w = state->src_h >> 16;
+		src_h = state->src_w >> 16;
+	} else {
+		src_w = state->src_w >> 16;
+		src_h = state->src_h >> 16;
+	}
+
 	if ((state->crtc_w == src_w) && (state->crtc_h == src_h)) {
 		/* Scaling not necessary for this plane. */
 		mc->scaled_planes_mask &= ~(mp->layer->id);