drm/rockchip: Enable vblank without event

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

Reviewed-by: Yakir Yang <ykk@rock-chips.com>
Tested-by: Yakir Yang <ykk@rock-chip.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>

1 files changed, 10 insertions, 5 deletions

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 5eb2b9998d40..790ba917e12d 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -110,6 +110,7 @@ struct vop {
         struct device *dev;
         struct drm_device *drm_dev;
         bool is_enabled;
+        bool vblank_active;
 
         /* mutex vsync_ work */
         struct mutex vsync_mutex;
@@ -1090,10 +1091,11 @@ static void vop_crtc_atomic_begin(struct drm_crtc *crtc,
         struct vop *vop = to_vop(crtc);
 
         spin_lock_irq(&crtc->dev->event_lock);
-        if (crtc->state->event) {
-                WARN_ON(drm_crtc_vblank_get(crtc) != 0);
-                WARN_ON(vop->event);
+        vop->vblank_active = true;
+        WARN_ON(drm_crtc_vblank_get(crtc) != 0);
+        WARN_ON(vop->event);
 
+        if (crtc->state->event) {
                 vop->event = crtc->state->event;
                 crtc->state->event = NULL;
         }
@@ -1180,12 +1182,14 @@ static void vop_handle_vblank(struct vop *vop)
 
         spin_lock_irqsave(&drm->event_lock, flags);
         if (vop->event) {
-
                 drm_crtc_send_vblank_event(crtc, vop->event);
-                drm_crtc_vblank_put(crtc);
                 vop->event = NULL;
 
         }
+        if (vop->vblank_active) {
+                vop->vblank_active = false;
+                drm_crtc_vblank_put(crtc);
+        }
         spin_unlock_irqrestore(&drm->event_lock, flags);
 
         if (!completion_done(&vop->wait_update_complete))
@@ -1455,6 +1459,7 @@ static int vop_initial(struct vop *vop)
         clk_disable(vop->aclk);
 
         vop->is_enabled = false;
+        vop->vblank_active = false;
 
         return 0;