[PATCH 5/6] drm/rockchip: Enable vblank without event

[Sean Paul <seanpaul@chromium.org>]

vblank should be enabled regardless of whether an event
is expected back. This is especially important for a cursor
plane.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
 drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 86d60ff..c0fbe0a 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -111,6 +111,7 @@ struct vop {
 	struct device *dev;
 	struct drm_device *drm_dev;
 	bool is_enabled;
+	bool vblank_active;
 
 	/* mutex vsync_ work */
 	struct mutex vsync_mutex;
@@ -961,6 +962,7 @@ static void vop_crtc_cancel_pending_vblank(struct drm_crtc *crtc,
 	unsigned long flags;
 
 	spin_lock_irqsave(&drm->event_lock, flags);
+
 	e = vop->event;
 	if (e && e->base.file_priv == file_priv) {
 		vop->event = NULL;
@@ -1108,9 +1110,10 @@ static void vop_crtc_atomic_begin(struct drm_crtc *crtc,
 {
 	struct vop *vop = to_vop(crtc);
 
-	if (crtc->state->event) {
-		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
+	WARN_ON(drm_crtc_vblank_get(crtc) != 0);
+	vop->vblank_active = true;
 
+	if (crtc->state->event) {
 		vop->event = crtc->state->event;
 		crtc->state->event = NULL;
 	}
@@ -1200,11 +1203,16 @@ static void vop_handle_vblank(struct vop *vop)
 		spin_lock_irqsave(&drm->event_lock, flags);
 
 		drm_crtc_send_vblank_event(crtc, vop->event);
-		drm_crtc_vblank_put(crtc);
 		vop->event = NULL;
 
 		spin_unlock_irqrestore(&drm->event_lock, flags);
 	}
+
+	if (vop->vblank_active) {
+		vop->vblank_active = false;
+		drm_crtc_vblank_put(crtc);
+	}
+
 	if (!completion_done(&vop->wait_update_complete))
 		complete(&vop->wait_update_complete);
 }
@@ -1485,6 +1493,7 @@ static int vop_initial(struct vop *vop)
 	clk_disable(vop->aclk);
 
 	vop->is_enabled = false;
+	vop->vblank_active = false;
 
 	return 0;
 
-- 
2.8.0.rc3.226.g39d4020

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