drm/msm: dpu: Move pm_runtime_(get|put) from vblank_enable

There are 4 times that _dpu_crtc_vblank_enable_no_lock() is called:

1- crtc enable
2- crtc disable
3- crtc vblank enable
4- crtc vblank disable

When we enable or disable the crtc, we call drm_crtc_vblank_on and
drm_crtc_vblank_off respectively. That will gate vblank enables and
disables to only being called when the crtc is active. That means that
we can just enable/disable pm runtime in crtc enable/disable. This will
be beneficial in trying to eliminate blocking calls from the vblank call
chain.

Changes in v2:
- None
Reviewed-by: Jeykumar Sankaran <jsanka@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c

@@ -784,8 +784,6 @@ static void _dpu_crtc_vblank_enable_no_lock(
 	struct drm_encoder *enc;
 
 	if (enable) {
-		pm_runtime_get_sync(dev->dev);
-
 		list_for_each_entry(enc, &dev->mode_config.encoder_list, head) {
 			if (enc->crtc != crtc)
 				continue;
@@ -808,8 +806,6 @@ static void _dpu_crtc_vblank_enable_no_lock(
 
 			dpu_encoder_register_vblank_callback(enc, NULL, NULL);
 		}
-
-		pm_runtime_put_sync(dev->dev);
 	}
 }
 
@@ -918,6 +914,8 @@ static void dpu_crtc_disable(struct drm_crtc *crtc)
 		crtc->state->event = NULL;
 		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
 	}
+
+	pm_runtime_put_sync(crtc->dev->dev);
 }
 
 static void dpu_crtc_enable(struct drm_crtc *crtc,
@@ -933,6 +931,8 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
 	}
 	priv = crtc->dev->dev_private;
 
+	pm_runtime_get_sync(crtc->dev->dev);
+
 	DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);
 	dpu_crtc = to_dpu_crtc(crtc);