The mediatek atomic_check implementation uses the deprecated
drm_atomic_get_existing_crtc_state() helper.

This hook is called as part of the global atomic_check, thus before the
states are swapped. The existing state thus points to the new state, and
we can use drm_atomic_get_new_crtc_state() instead.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
To: Chun-Kuang Hu <chunkuang.hu@kernel.org>
To: Philipp Zabel <p.zabel@pengutronix.de>
To: Matthias Brugger <matthias.bgg@gmail.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-mediatek@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/gpu/drm/mediatek/mtk_plane.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_plane.c b/drivers/gpu/drm/mediatek/mtk_plane.c
index cbc4f37da8ba81ff9c8b3b58f66363837ffc21ec..d4486a63a6e01f02b6777522440dee8e39d51bf1 100644
--- a/drivers/gpu/drm/mediatek/mtk_plane.c
+++ b/drivers/gpu/drm/mediatek/mtk_plane.c
@@ -120,11 +120,12 @@ static int mtk_plane_atomic_async_check(struct drm_plane *plane,
 	ret = mtk_crtc_plane_check(new_plane_state->crtc, plane,
 				   to_mtk_plane_state(new_plane_state));
 	if (ret)
 		return ret;
 
-	crtc_state = drm_atomic_get_existing_crtc_state(state, new_plane_state->crtc);
+	crtc_state = drm_atomic_get_new_crtc_state(state,
+						   new_plane_state->crtc);
 
 	return drm_atomic_helper_check_plane_state(plane->state, crtc_state,
 						   DRM_PLANE_NO_SCALING,
 						   DRM_PLANE_NO_SCALING,
 						   true, true);

-- 
2.51.0