drm/i915: Extract intel_crtc_arm_vblank_event()

We'll need to arm the vblank event also from the future
DSB based codepath. Extract the function that does the
whold dance for us.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240611133344.30673-2-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_crtc.c

@@ -560,6 +560,23 @@ static void dbg_vblank_evade(struct intel_crtc *crtc, ktime_t end)
 static void dbg_vblank_evade(struct intel_crtc *crtc, ktime_t end) {}
 #endif
 
+void intel_crtc_arm_vblank_event(struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	unsigned long irqflags;
+
+	if (!crtc_state->uapi.event)
+		return;
+
+	drm_WARN_ON(crtc->base.dev, drm_crtc_vblank_get(&crtc->base) != 0);
+
+	spin_lock_irqsave(&crtc->base.dev->event_lock, irqflags);
+	drm_crtc_arm_vblank_event(&crtc->base, crtc_state->uapi.event);
+	spin_unlock_irqrestore(&crtc->base.dev->event_lock, irqflags);
+
+	crtc_state->uapi.event = NULL;
+}
+
 /**
  * intel_pipe_update_end() - end update of a set of display registers
  * @state: the atomic state
@@ -601,16 +618,8 @@ void intel_pipe_update_end(struct intel_atomic_state *state,
 		drm_vblank_work_schedule(&new_crtc_state->vblank_work,
 					 drm_crtc_accurate_vblank_count(&crtc->base) + 1,
 					 false);
-	} else if (new_crtc_state->uapi.event) {
-		drm_WARN_ON(&dev_priv->drm,
-			    drm_crtc_vblank_get(&crtc->base) != 0);
-
-		spin_lock(&crtc->base.dev->event_lock);
-		drm_crtc_arm_vblank_event(&crtc->base,
-					  new_crtc_state->uapi.event);
-		spin_unlock(&crtc->base.dev->event_lock);
-
-		new_crtc_state->uapi.event = NULL;
+	} else {
+		intel_crtc_arm_vblank_event(new_crtc_state);
 	}
 
 	/*

drivers/gpu/drm/i915/display/intel_crtc.h

@@ -28,6 +28,7 @@ struct intel_crtc_state;
 
 int intel_usecs_to_scanlines(const struct drm_display_mode *adjusted_mode,
 			     int usecs);
+void intel_crtc_arm_vblank_event(struct intel_crtc_state *crtc_state);
 u32 intel_crtc_max_vblank_count(const struct intel_crtc_state *crtc_state);
 int intel_crtc_init(struct drm_i915_private *dev_priv, enum pipe pipe);
 struct intel_crtc_state *intel_crtc_state_alloc(struct intel_crtc *crtc);