drm/rockchip: set unused layer with top zpos

Hardware limited, we should keep all unused layer same
with the same zpos, otherwise, would get display abnormal.

Change-Id: I417a6a14731148a89f0372cc028e43a94b56e4d3
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 181c582a71a44a8c37817eaecad448ed4b178b7a..15c907ab3821391d1880a2c446d99f116145a93f 100644 (file)
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -1096,6 +1096,7 @@ static int vop_crtc_atomic_check(struct drm_crtc *crtc,
        struct drm_device *dev = crtc->dev;
        struct rockchip_crtc_state *s = to_rockchip_crtc_state(state);
        struct vop *vop = to_vop(crtc);
+       const struct vop_data *vop_data = vop->data;
        struct drm_plane *plane;
        struct vop_zpos *pzpos;
        int dsp_layer_sel = 0;
@@ -1134,6 +1135,15 @@ static int vop_crtc_atomic_check(struct drm_crtc *crtc,
 
        sort(pzpos, cnt, sizeof(pzpos[0]), vop_zpos_cmp, NULL);
 
+       WARN_ON(vop_data->win_size < cnt);
+       for (i = 0; i < (vop_data->win_size - cnt); i++) {
+               dsp_layer_sel <<= 2;
+               /*
+                * after sort, pzpos[0] is the top zpos layer.
+                */
+               dsp_layer_sel |= pzpos[0].win_id;
+       }
+
        for (i = 0; i < cnt; i++) {
                struct vop_zpos *zpos = &pzpos[i];