drm/i915: Extract intel_crtc_prepare_vblank_event()

Extract the code for staging the vblank event for the
flip done interrupt handler. We'll reuse this for DSB
stuff later.

Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240930170415.23841-11-ville.syrjala@linux.intel.com

Author: vsyrjala

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

@@ -521,12 +521,8 @@ void intel_pipe_update_start(struct intel_atomic_state *state,
 	intel_psr_lock(new_crtc_state);
 
 	if (new_crtc_state->do_async_flip) {
-		spin_lock_irq(&crtc->base.dev->event_lock);
-		/* arm the event for the flip done irq handler */
-		crtc->flip_done_event = new_crtc_state->uapi.event;
-		spin_unlock_irq(&crtc->base.dev->event_lock);
-
-		new_crtc_state->uapi.event = NULL;
+		intel_crtc_prepare_vblank_event(new_crtc_state,
+						&crtc->flip_done_event);
 		return;
 	}
 
@@ -626,6 +622,19 @@ void intel_crtc_arm_vblank_event(struct intel_crtc_state *crtc_state)
 	crtc_state->uapi.event = NULL;
 }
 
+void intel_crtc_prepare_vblank_event(struct intel_crtc_state *crtc_state,
+				     struct drm_pending_vblank_event **event)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	unsigned long irqflags;
+
+	spin_lock_irqsave(&crtc->base.dev->event_lock, irqflags);
+	*event = 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

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

@@ -14,6 +14,7 @@ struct drm_device;
 struct drm_display_mode;
 struct drm_file;
 struct drm_i915_private;
+struct drm_pending_vblank_event;
 struct intel_atomic_state;
 struct intel_crtc;
 struct intel_crtc_state;
@@ -34,6 +35,8 @@ int intel_usecs_to_scanlines(const struct drm_display_mode *adjusted_mode,
 int intel_scanlines_to_usecs(const struct drm_display_mode *adjusted_mode,
 			     int scanlines);
 void intel_crtc_arm_vblank_event(struct intel_crtc_state *crtc_state);
+void intel_crtc_prepare_vblank_event(struct intel_crtc_state *crtc_state,
+				     struct drm_pending_vblank_event **event);
 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);
 int intel_crtc_get_pipe_from_crtc_id_ioctl(struct drm_device *dev, void *data,