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Subject[PATCH v1, 1/2] drm/mediatek: Fixup external display black screen issue
Date
From: Yongqiang Niu <yongqiang.niu@mediatek.com>

Problem:
overlay hangup when external display hotplut test

Fix:
disable overlay when crtc disable

Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
---
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
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