From: Andy Yan <andy.yan@rock-chips.com>

Because the layer/window enable/disable is take effect by vsync, if the
overlay configuration of these layers does not follow vsync and
takes effect immediately instead, when multiple layers are dynamically
enable/disable, inconsistent display contents may be seen on the screen.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
---

 drivers/gpu/drm/rockchip/rockchip_drm_vop2.h | 1 +
 drivers/gpu/drm/rockchip/rockchip_vop2_reg.c | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.h b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.h
index 680bedbb770e..fc3ecb9fcd95 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.h
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.h
@@ -710,6 +710,7 @@ enum dst_factor_mode {
 
 #define VOP2_COLOR_KEY_MASK				BIT(31)
 
+#define RK3568_OVL_CTRL__LAYERSEL_REGDONE_SEL		GENMASK(31, 30)
 #define RK3568_OVL_CTRL__LAYERSEL_REGDONE_IMD		BIT(28)
 #define RK3568_OVL_CTRL__YUV_MODE(vp)			BIT(vp)
 
diff --git a/drivers/gpu/drm/rockchip/rockchip_vop2_reg.c b/drivers/gpu/drm/rockchip/rockchip_vop2_reg.c
index 0a2840cbe8e2..32c4ed685739 100644
--- a/drivers/gpu/drm/rockchip/rockchip_vop2_reg.c
+++ b/drivers/gpu/drm/rockchip/rockchip_vop2_reg.c
@@ -2070,7 +2070,10 @@ static void rk3568_vop2_setup_layer_mixer(struct vop2_video_port *vp)
 	struct rockchip_crtc_state *vcstate = to_rockchip_crtc_state(vp->crtc.state);
 
 	ovl_ctrl = vop2_readl(vop2, RK3568_OVL_CTRL);
-	ovl_ctrl |= RK3568_OVL_CTRL__LAYERSEL_REGDONE_IMD;
+	ovl_ctrl &= ~RK3568_OVL_CTRL__LAYERSEL_REGDONE_IMD;
+	ovl_ctrl &= ~RK3568_OVL_CTRL__LAYERSEL_REGDONE_SEL;
+	ovl_ctrl |= FIELD_PREP(RK3568_OVL_CTRL__LAYERSEL_REGDONE_SEL, vp->id);
+
 	if (vcstate->yuv_overlay)
 		ovl_ctrl |= RK3568_OVL_CTRL__YUV_MODE(vp->id);
 	else
-- 
2.43.0

On Tue, 18 Mar 2025 14:20:17 +0800, Andy Yan wrote:
> Because the layer/window enable/disable is take effect by vsync, if the
> overlay configuration of these layers does not follow vsync and
> takes effect immediately instead, when multiple layers are dynamically
> enable/disable, inconsistent display contents may be seen on the screen.
> 
> 

Applied, thanks!

[1/1] drm/rockchip: vop2: Make overlay layer select register configuration take effect by vsync
      commit: c5996e4ab109c8bb5541453b20647eaaf9350f41

Best regards,
-- 
Heiko Stuebner <heiko@sntech.de>