[PATCH] drm/rockchip: vop2: give rk3576 VP2 a primary plane

[Tomonori Nakagawa <jack@supremeoverlordjabs.co>]

The rk3576 VOP2 has three video ports. VP0 and VP1 each have a Cluster
window that acts as their primary plane, but VP2 - the port wired to the
DesignWare DP controller - only has Esmart windows, all typed
DRM_PLANE_TYPE_OVERLAY.

The driver requires every active video port to own a
DRM_PLANE_TYPE_PRIMARY plane. When VP2 is driven (a board that uses the
DP output) it finds none, CRTC creation returns -ENOENT, and the whole
VOP2 bind fails, taking down the entire display subsystem.

Promote Esmart0 to DRM_PLANE_TYPE_PRIMARY so VP2 has a primary plane.
Esmart0's possible_vp_mask already includes VP2 (BIT(2)) and its
layer_sel_id[2] = 0 is a valid VP2 layer slot, while VP0 keeps Cluster0
as its primary, so the existing VP0/VP1 assignments are unchanged:

  VP0: primary=Cluster0, overlay=Esmart2
  VP1: primary=Cluster1, overlays=Esmart1, Esmart3
  VP2: primary=Esmart0,  overlays=Esmart1, Esmart2, Esmart3

Tested on Anbernic RG Vita Pro (rk3576) with the DP alt-mode output.

Signed-off-by: Tomonori Nakagawa <jack@supremeoverlordjabs.co>
---
 drivers/gpu/drm/rockchip/rockchip_vop2_reg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_vop2_reg.c b/drivers/gpu/drm/rockchip/rockchip_vop2_reg.c
index 17eda592b..e7d013dc3 100644
--- a/drivers/gpu/drm/rockchip/rockchip_vop2_reg.c
+++ b/drivers/gpu/drm/rockchip/rockchip_vop2_reg.c
@@ -894,7 +894,7 @@ static const struct vop2_win_data rk3576_vop_win_data[] = {
 		.format_modifiers = format_modifiers,
 		.layer_sel_id = { 2, 0xf, 0, 0xf },
 		.supported_rotations = DRM_MODE_REFLECT_Y,
-		.type = DRM_PLANE_TYPE_OVERLAY,
+		.type = DRM_PLANE_TYPE_PRIMARY,
 		.axi_bus_id = 0,
 		.axi_yrgb_r_id = 0x10,
 		.axi_uv_r_id = 0x11,
-- 
2.54.0