drm/amdgpu: Call pageflip irq funtion when receiced vsync interrupt.

For virtual display feature, as there is no dce engine, so no pageflip irq
generated. So directly call pageflip irq funtion when received vysn interrupt.
Signed-off-by: Emily Deng <Emily.Deng@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/dce_virtual.c

@@ -36,6 +36,9 @@
 
 static void dce_virtual_set_display_funcs(struct amdgpu_device *adev);
 static void dce_virtual_set_irq_funcs(struct amdgpu_device *adev);
+static int dce_virtual_pageflip_irq(struct amdgpu_device *adev,
+				  struct amdgpu_irq_src *source,
+				  struct amdgpu_iv_entry *entry);
 
 /**
  * dce_virtual_vblank_wait - vblank wait asic callback.
@@ -650,6 +653,7 @@ static enum hrtimer_restart dce_virtual_vblank_timer_handle(struct hrtimer *vbla
 	unsigned crtc = 0;
 	adev->ddev->vblank[0].count++;
 	drm_handle_vblank(adev->ddev, crtc);
+	dce_virtual_pageflip_irq(adev, NULL, NULL);
 	hrtimer_start(vblank_timer, ktime_set(0, DCE_VIRTUAL_VBLANK_PERIOD), HRTIMER_MODE_REL);
 	return HRTIMER_NORESTART;
 }
@@ -718,7 +722,7 @@ static int dce_virtual_crtc_irq(struct amdgpu_device *adev,
 	if (amdgpu_irq_enabled(adev, source, irq_type)) {
 		drm_handle_vblank(adev->ddev, crtc);
 	}
-
+	dce_virtual_pageflip_irq(adev, NULL, NULL);
 	DRM_DEBUG("IH: D%d vblank\n", crtc + 1);
 	return 0;
 }