From: Maxime Ripard <maxime.ripard@bootlin.com>
Date: Wed, 21 Feb 2018 13:57:03 +0100
Subject: drm/sun4i: crtc: Call drm_crtc_vblank_on / drm_crtc_vblank_off
Git-commit: fd00c4ee76f0b509ce79ffbc1f5a682fbdd84efd
Patch-mainline: v4.16-rc5
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Make sure that the CRTC code will call the enable/disable_vblank hooks.

Otherwise, since the refcounting will be off, we might end up in a
situation where the vblank management functions are called while the CRTC
is off.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180221125703.4595-3-maxime.ripard@bootlin.com

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/sun4i/sun4i_crtc.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/sun4i/sun4i_crtc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_crtc.c
@@ -93,6 +93,8 @@ static void sun4i_crtc_atomic_disable(st
 
 	DRM_DEBUG_DRIVER("Disabling the CRTC\n");
 
+	drm_crtc_vblank_off(crtc);
+
 	sun4i_tcon_set_status(scrtc->tcon, encoder, false);
 
 	if (crtc->state->event && !crtc->state->active) {
@@ -113,6 +115,8 @@ static void sun4i_crtc_atomic_enable(str
 	DRM_DEBUG_DRIVER("Enabling the CRTC\n");
 
 	sun4i_tcon_set_status(scrtc->tcon, encoder, true);
+
+	drm_crtc_vblank_on(crtc);
 }
 
 static void sun4i_crtc_mode_set_nofb(struct drm_crtc *crtc)