[PATCH v7 6/8] drm/i915: Add intel_atomic_get_existing_crtc_state function

[Mahesh Kumar <mahesh1.kumar@intel.com>]

This patch Adds a function to extract intel_crtc_state from the
atomic_state, if not available it returns NULL.

Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/intel_drv.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 3069512..dbee392 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1804,6 +1804,20 @@ intel_atomic_get_crtc_state(struct drm_atomic_state *state,
 	return to_intel_crtc_state(crtc_state);
 }
 
+static inline struct intel_crtc_state *
+intel_atomic_get_existing_crtc_state(struct drm_atomic_state *state,
+				      struct intel_crtc *crtc)
+{
+	struct drm_crtc_state *crtc_state;
+
+	crtc_state = drm_atomic_get_existing_crtc_state(state, &crtc->base);
+
+	if (crtc_state)
+		return to_intel_crtc_state(crtc_state);
+	else
+		return NULL;
+}
+
 static inline struct intel_plane_state *
 intel_atomic_get_existing_plane_state(struct drm_atomic_state *state,
 				      struct intel_plane *plane)
-- 
2.10.1

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