drm/tegra: plane: Correct legacy blending

Keep old 'dependent' state of unaffected planes, this way new state takes
into account current state of unaffected planes.

Fixes: ebae8d07435a ("drm/tegra: dc: Implement legacy blending")
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/gpu/drm/tegra/plane.c b/drivers/gpu/drm/tegra/plane.c
index eddaa2f05ed6..94dac79ac3c9 100644
--- a/drivers/gpu/drm/tegra/plane.c
+++ b/drivers/gpu/drm/tegra/plane.c
@@ -334,9 +334,6 @@ void tegra_plane_check_dependent(struct tegra_plane *tegra,
         unsigned int zpos[2];
         unsigned int i;
 
-        for (i = 0; i < 3; i++)
-                state->dependent[i] = false;
-
         for (i = 0; i < 2; i++)
                 zpos[i] = 0;
 
@@ -350,6 +347,8 @@ void tegra_plane_check_dependent(struct tegra_plane *tegra,
 
                 index = tegra_plane_get_overlap_index(tegra, p);
 
+                state->dependent[index] = false;
+
                 /*
                  * If any of the other planes is on top of this plane and uses
                  * a format with an alpha component, mark this plane as being