[PATCH v1, 1/2] drm/mediatek: Fixup external display black screen issue

[<yongqiang.niu@xxxxxxxxxxxx>]

From: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx>

Problem:
overlay hangup when external display hotplut test

Fix:
disable overlay when crtc disable

Signed-off-by: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 39 +++++++++++++++++++++------------
 1 file changed, 25 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 4fb346c..7eca02f 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -369,6 +369,20 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
 	mtk_disp_mutex_add_comp(mtk_crtc->mutex, mtk_crtc->ddp_comp[i]->id);
 	mtk_disp_mutex_enable(mtk_crtc->mutex);
 
+	/* Initially configure all planes */
+	for (i = 0; i < mtk_crtc->layer_nr; i++) {
+		struct drm_plane *plane = &mtk_crtc->planes[i];
+		struct mtk_plane_state *plane_state;
+		struct mtk_ddp_comp *comp;
+		unsigned int local_layer;
+
+		plane_state = to_mtk_plane_state(plane->state);
+		comp = mtk_drm_ddp_comp_for_plane(crtc, plane, &local_layer);
+		if (comp)
+			mtk_ddp_comp_layer_config(comp, local_layer,
+						  plane_state, NULL);
+	}
+
 	for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) {
 		struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[i];
 		enum mtk_ddp_comp_id prev;
@@ -385,20 +399,6 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
 		mtk_ddp_comp_start(comp);
 	}
 
-	/* Initially configure all planes */
-	for (i = 0; i < mtk_crtc->layer_nr; i++) {
-		struct drm_plane *plane = &mtk_crtc->planes[i];
-		struct mtk_plane_state *plane_state;
-		struct mtk_ddp_comp *comp;
-		unsigned int local_layer;
-
-		plane_state = to_mtk_plane_state(plane->state);
-		comp = mtk_drm_ddp_comp_for_plane(crtc, plane, &local_layer);
-		if (comp)
-			mtk_ddp_comp_layer_config(comp, local_layer,
-						  plane_state, NULL);
-	}
-
 	return 0;
 
 err_mutex_unprepare:
@@ -607,10 +607,21 @@ static void mtk_drm_crtc_atomic_disable(struct drm_crtc *crtc,
 	for (i = 0; i < mtk_crtc->layer_nr; i++) {
 		struct drm_plane *plane = &mtk_crtc->planes[i];
 		struct mtk_plane_state *plane_state;
+		struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[0];
+		unsigned int comp_layer_nr = mtk_ddp_comp_layer_nr(comp);
+		unsigned int local_layer;
 
 		plane_state = to_mtk_plane_state(plane->state);
 		plane_state->pending.enable = false;
 		plane_state->pending.config = true;
+
+		if (i >= comp_layer_nr) {
+			comp = mtk_crtc->ddp_comp[1];
+			local_layer = i - comp_layer_nr;
+		} else
+			local_layer = i;
+		mtk_ddp_comp_layer_config(comp, local_layer,
+					  plane_state, NULL);
 	}
 	mtk_crtc->pending_planes = true;
 
-- 
1.8.1.1.dirty