[PATCH v12 08/10] drm/mediatek: set monitor to DP_SET_POWER_D3 to avoid garbage

[Bo-Chen Chen]

Set the monitor power state to DP_SET_POWER_D3 to avoid garbage.

Signed-off-by: Jitao Shi <jitao.shi at mediatek.com>
Signed-off-by: Bo-Chen Chen <rex-bc.chen at mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index 40771ac318e7..92cbcd403a73 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -2003,6 +2003,11 @@ static void mtk_dp_bridge_atomic_disable(struct drm_bridge *bridge,
 {
 	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
 
+	if (mtk_dp_plug_state(mtk_dp)) {
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
+		usleep_range(2000, 3000);
+	}
+
 	mtk_dp_video_mute(mtk_dp, true);
 	mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING;
 
-- 
2.18.0