From: Rob Clark <robdclark@gmail.com>
Date: Tue, 17 Oct 2017 09:39:39 -0400
Subject: drm/msm/mdp4: disable vblanks when crtc is off
Git-commit: cae923e6bf2168d1e332977e1de224ee5da1a32c
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Rob Clark <robdclark@gmail.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
@@ -290,6 +290,9 @@ static void mdp4_crtc_atomic_disable(str
 	if (WARN_ON(!mdp4_crtc->enabled))
 		return;
 
+	/* Disable/save vblank irq handling before power is disabled */
+	drm_crtc_vblank_off(crtc);
+
 	mdp_irq_unregister(&mdp4_kms->base, &mdp4_crtc->err);
 	mdp4_disable(mdp4_kms);
 
@@ -308,6 +311,10 @@ static void mdp4_crtc_atomic_enable(stru
 		return;
 
 	mdp4_enable(mdp4_kms);
+
+	/* Restore vblank irq handling after power is enabled */
+	drm_crtc_vblank_on(crtc);
+
 	mdp_irq_register(&mdp4_kms->base, &mdp4_crtc->err);
 
 	crtc_flush(crtc);