drm/tegra: dc: Clarify comment about cursor treatment

Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index e424755dd578..6b1dc02f98ef 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -809,9 +809,11 @@ static struct drm_plane *tegra_dc_cursor_plane_create(struct drm_device *drm,
                 return ERR_PTR(-ENOMEM);
 
         /*
-         * We'll treat the cursor as an overlay plane with index 6 here so
-         * that the update and activation request bits in DC_CMD_STATE_CONTROL
-         * match up.
+         * This index is kind of fake. The cursor isn't a regular plane, but
+         * its update and activation request bits in DC_CMD_STATE_CONTROL do
+         * use the same programming. Setting this fake index here allows the
+         * code in tegra_add_plane_state() to do the right thing without the
+         * need to special-casing the cursor plane.
          */
         plane->index = 6;